US3870114A - Drilling apparatus especially for ground drilling - Google Patents

Drilling apparatus especially for ground drilling Download PDF

Info

Publication number
US3870114A
US3870114A US381556A US38155673A US3870114A US 3870114 A US3870114 A US 3870114A US 381556 A US381556 A US 381556A US 38155673 A US38155673 A US 38155673A US 3870114 A US3870114 A US 3870114A
Authority
US
United States
Prior art keywords
casing pipe
drill
hole
bit
drill bit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US381556A
Inventor
Elgas Pulk
John Paul Noren
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Stabilator AB
Original Assignee
Stabilator AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Stabilator AB filed Critical Stabilator AB
Priority to US381556A priority Critical patent/US3870114A/en
Application granted granted Critical
Publication of US3870114A publication Critical patent/US3870114A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00—Drill bits
    • E21B10/36—Percussion drill bits
    • E21B10/40—Percussion drill bits with leading portion
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00—Drill bits
    • E21B10/64—Drill bits characterised by the whole or part thereof being insertable into or removable from the borehole without withdrawing the drilling pipe
    • E21B10/66—Drill bits characterised by the whole or part thereof being insertable into or removable from the borehole without withdrawing the drilling pipe the cutting element movable through the drilling pipe and laterally shiftable
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B4/00—Drives for drilling, used in the borehole

Definitions

  • drill bit includes a pilot bit having an axis which coin- 5 References Cited cides with the center line of the drill hole and is paral- UNITED STATES PATENTS lel to and separate from the central axis of the drlll umt wh1ch 1s the line of action of the percussion force. 443,070 12/1890 Chapman l75/l7l 654,981 7/1900 Howarth et al.
  • the present invention relates to drilling apparatus for drilling in the ground where a drill unit having a drill bit is driven by driving means and coacts with a casing pipe which is sinkable into a hole drilled by the drill unit, the hole having a diameter at least equal to the outside diameter of the casing pipe.
  • the drill unit is guidable in the casing pipe and retractable into it and has a central axis substantially parallel with but spaced from the center line of the drill hole, the central axis being the line of action for a percussion force from the driving means tothe drill unit in the working position of the latter.
  • the object of this invention is to' eliminate the above mentioned disadvantages, and construct a drilling apparatus which makes the successive introduction of the casing pipe into the drill hole simple and effective, while still maintaining good drill control.
  • a further object is to accomplish a drilling apparatus which works quietly and has small force transmission losses.
  • the drilling apparatus is characterized in that the casing pipe is pullable without rotation into the hole drilled by the drill bit, and in that the drill bit has a ring bit from which protrudes downwards a pilot bit, the central axis of which conincides with the center line of the drill hole and is parallel to and spaced from the central axis of the drill unit and the line of action of the percussion force.
  • the casing pipe is constructed to house the driving means, which is so arranged as to operate the drill unit at the lower part of the casing pipe. Because the casing pipe is pulled into the drill hole, a thinner and lighter casing pipe than those previously used may be employed, and thereby less force will be required to pull the casing pipe down. Also, by placing the driving means in the casing pipe, the driving means does not have to set in motion a long shaft connection, and the whole drive force can thus be concentrated on the drill unit, thereby maximum the efficiency of the apparatus. This position of the driving means also makes effective silencing possible. By providing the drill bit with a special pilot bit, the whole drill unit will revolve about the central axis of the, pilot bit, in this way facilitating guidance of the drill unit. At the same time, the percussion force from the driving means is directed along the central axis of the drill bit, thus eliminating slanting loads.
  • the lower end of the casing pipe has a driving shoe provided with a supporting surface designed to coact, for pulling down the casing pipe, with engaging means arranged around the periphery of the drill unit and shaped to fit against the supporting surface.
  • the supporting surface is shaped as a portion of the surface of a truncated cone having a downwardly directed apex to form a guiding surface whereby the drill unit is guided in the casing.
  • the casing pipe itself can be made even thinner and consequently cheaper and lighter, while the risk of damage to the lower end of the casing pipe is diminished.
  • the drill unit receives simple and effective guidance while not taking up space in the casing pipe.
  • FIG. 1 schematically shows a drilling apparatus in which the drill unit according to the invention is a part
  • FIG. 2 shows a longitudinal section through the drill unit according to-the invention
  • FIG. 3 shows the drill unit according to FIG. 2 seen from below
  • FIG. 4 shows a section along the line lV-IV in FIG. 2.
  • the drilling apparatus 1 shown in FIG, 1 includes a casing pipe 2 guiding a drill unit 3, which is connected with and operated by driving means 4, preferably in the form of a sinker drill lowered into the casing pipe.
  • driving means 4 preferably in the form of a sinker drill lowered into the casing pipe.
  • drill unit 3 as may be seen in FIG. 2, has two portions united to each other, an adaptor portion 5 and a drill bit 6, the drill bit 6 supporting a cutting unit 7 protruding from casing pipe 2.
  • the cutting unit 7 in turn includes a ring bit 8 and protruding from this a pilot bit 9.
  • a driving shoe 10 is attached to the lower portion of the casing pipe 2, the inside diameter of the shoe being larger than the diameter of the cutting unit 7, so that it is possible for'the cutting unit to pass through the driving shoe, and to withdraw the whole of the drill unit 3 into the casing pipe 2.
  • the drill unit 3 is guided in the casing pipe 2 by engaging means 11 that are arranged around the periphery of the drill bit 6 and rest against a supporting surface 12 on the upper part of the driving shoe 10, so that the central axis 13 of the drill unit 3 which is directed through the center of the cutting unit 7, is essentially parallel with but spaced from the center line 14 of the drill hole.
  • the central axis 13 coincides with the central axis of the adapter portion 5 and is the line of action for a percussion force exerted on the drill unit 3 by the driving means 4.
  • the pilot bit 9, the center of which coincides with the center line 14 of the drill hole (see also FIG. 3), has a diameter which is less than that of the ring bit 8, and is removably attached to it.
  • the drill unit 3 will revolve about the centerline of the pilot bit 9, and'rotate about the central axis 13 so that the point 15 on the ringbit8 will thereby move around the periphery of a drill hole, the diameter of which is made at least as great as the outside diameter of the casing pipe 2.
  • the adapter portion 5, which acts to transmit driving force from the driving means 4 to the drill unit 3 has, in the embodiment shown here, the shape ofa generally cylindrical shaft, which in its lower end is provided with a substantially spherical ball 16.
  • the ball 16 is housed in a recess 17 in the drill bit 6, and is retained in the recess by a retaining sleeve 18 encircling the adapter portion 5' and screwed or attached in some other way to the drill bit 6.
  • the ball 16 rests in the bottom of the recess 17 and is supported by a seat 19, the shape of which conforms to the shape of the ball thereby providing a large area for transferring percussive force. From FIG.
  • the ball 16 is provided with two substantially planar side surfaces 20, mutually parallel and parallel also to the longitudinal axis of the adapter portion 5. Side surfaces 20 each abut and act against locking plates 21 (shown with dotted lines in FIG. 2), in the drill bit 6.
  • the drill bit 6 By pulling the adapter portion 5 upwards, the side surfaces 20 are pulled along the locking plates 21 until the lower part of sleeve 18 comes into .contact with the ball 16, arresting its continued motion upward. Upon continued pulling, with the adapter portion 5 remaining in its vertical position, the drill bit 6 will pivot in relation to the adapter portion as the ball 16 is pulled towards a lifting surface 22, which is part of the confining wall of the recess 17.
  • the hole through the locking sleeve 18 is, as shown in FIG. 2, so shaped that it allows the drill bit to pivot relative to the adaptor portion around an axis essentially perpendicular to the longitudinal axis of the adapter portion.
  • the pivoting movement described makes it possible to pull the whole drill unit 3 into the casing pipe 2 from the working position shown.
  • the adapter'portion 5 and the drill bit 6 remain, becauseof the locking plates 21, in continuous torque transmitting engagement with each other, and the drill bit can therefore be rotated the whole time to facilitate withdrawal or lowering of the drill unit.
  • the adapter portion 5 is provided with at least one longitudinal duct 23 for conducting compressed air from the driving means 4.
  • the duct 23 terminates on the lower side of the ball 16, and from there transfers compressed air via a collecting duct 24 to at least one duct 25, and also to a duct 26 which opens into a longitudinal duct 27 through the pilot bit.
  • the compressed air ejected from said ducts takes away drilling dust via openings 31 between engaging means 11.
  • the sleeve 18 is provided with a ring seal 32, but it would also be possible to dispense with the seal 32 and to instead introduce, through one or more ducts in the adapter portion 5, comprssed air into recess 17, and let the air escape through the space between the adapter portion 5 and the sleeve 18. It would also be possible to arrange in the drill bit 6 compressed air ducts connected to the collecting duct 24 and to locate the mouths of these ducts adjacent the upper surface of the sleeve 18, thereby keeping the juncture between the sleeve and the adapter portion clean. it would of course, also be possible to use a combination of seal and introduction of compressed air.
  • the drill unit is simply and quickly guided to its correct working position in the casing pipe. A certain deformationof the supporting surface 12 is permitted, as it is normal practice to leave the casing pipe behind in the drill hole, there thus being no need to use the driving shoe again.
  • the lower portion of the driving shoe can, if so desired, be equipped with cutting bits, but as a rule this is not necessary.
  • the casing pipe By allowing the driving force on the casing pipe to be applied via the driving shoe, at the lower end of the casing pipe, a tensional load is applied to the pipe walls, and they can therefore be made thinner than a casing pipe that is pressed down by a force applied to the upper end of the casing pipe. If it is required, the casing pipe can also be given a certain degree of rotational movement by a suitable design of the driving shoe and support, or in some other way.
  • the operation is begun by placing the casing pipe with its driving shoe against the ground. Then the drill unit and the driving means are lowered into the casing pipe '50 that the drill bit touches the ground (if necessary, the drill unit can be rotated slightly so that the drill bit can get through the driving shoe). Then the casing pipe is raised so that the engaging means 11 engage the support surface 12 and the ball 16 comes to rest against the seat 19. The casing pipe is then aimed in the right direction and drilling can begin. With the help of valves operated by the adapter portion, or in some other way not shown, it is advantageous to arrange that the adapter portion 5 not be subject to percussion force from the driving means 4 before the ball 16 really rests against the seat 19. This is to avoid possible damage to the casing pipe or the driving shoe upon displacement of the drill unit. Both the pilot bit 9 and the adapter portion 5 are suitably provided with teeth or the like vto obtain torque transmitting engagement with the ring bit and the driving means respectively.
  • Apparatus for drilling a hole in the ground along a center line comprising a casing pipe adapted to be disposed in the hole,
  • a drill unit received in said casing pipe and having an adaptor portion and a drill bit and a central axis parallel to and spaced from the center line of the hole,
  • a generally cylindrical driving shoe attached to the end of said casing pipe and having on its inner side a supporting surface in the general form of a downwardly directed truncated cone, and
  • said drill bit including a ring bit with its center at the central axis of said drill unit and extending beyond said casing pipe to drill a hole wider than said casing pipe and a pilot bit extending from said ring bit with its center at the center line of the hole.
  • Drilling apparatus as claimed in claim 1 wherein said drill bit is pivotable relative to said adaptor portion so that it may be withdrawn into said casing pipe, and
  • said engaging means acting on the supporting surface of said driving shoe causes said drill bit to assume its working position as it is extended from said casing pipe.
  • Drilling apparatus as claimed in claim 1 wherein ducts are provided through said adaptor portion and through said drill bit so that compressed air can be introduced through said drill unit to the drilling surface.
  • Apparatus for drilling a hole along a center line comprising locking means on said drill bit preventing relative rotational movement between said adaptor portion and said drill bit but allowing pivoting of said drill bit relative to said adaptor portion,
  • said drill bit including a ring bit and a pilot bit extending therefrom, said ring bit extending outward beyond said casing pipe, and
  • said second end of said adaptor portion has thereon a generally spherical ball having flattened surfaces on opposite vertical sides, and
  • said locking means on said drill bit abut said flattened surfaces on said ball so that torque is transmitted from said adaptor portion to said drill bit.
  • a driving shoe is attached to said casing pipe and has an inner supporting surface in the form of a downwardly pointing truncated cone and said engaging means engage the supporting surface on said driving shoe to pull the casing pipe into the hole.

Abstract

Ground drilling apparatus where a drill unit is operated from within a casing pipe which is sunk into the hole drilled by the drill unit, the hole being wider than the casing pipe. The casing pipe is pulled without rotation into the hole by a drill bit of the drill unit. The drill bit includes a pilot bit having an axis which coincides with the center line of the drill hole and is parallel to and separate from the central axis of the drill unit which is the line of action of the percussion force.

Description

United States Patent 11 1 1111 3,870,114
Pulk, deceased et al. 1 1 Mar. 11, 1975 [54] DRILLING APPARATUS ESPECIALLY FOR 1,260,533 3/1918 Freeon 175/398 X GROUND DRILLING 3,199,616 8/1965 Hjalsten 175/398 X 3,277,972 10/1966 Lagerstrom 1 175/399 [75] Inventors: Elgas Pulk, deceased, late of 3,416,616 12/1968 Ahlgren 175/258 Uppsala, Sweden by Carlgustaf 3,682,260 8/1972 Klemm 1. 175/257 X Hallsenius, administrator; John Paul 1 Upplands by swden Primary ExaminerFrank L. Abbott [73] Assignee: Stabilator AB, Bromma, Sweden Assistant Exammer Rlchard Favreau 1 Attorney, Agent, or Firm-Anthony A. OBrien [22] Filed: July 23, 1973 1211 Appl. No.: 381,556 57 ABSTRACT Ground drilling apparatus where a drill unit is oper 521 US. Cl 175/258, 175/92, 175/390 flied from within a Casing p p which is sunk into the [51 1m. (:1 E2lb 9/26 hole drilled by the drill unit, the hole being wider than 58 Field of Search 175/171, 257, 258, 92, the Casing pipe The casing p is pulled Without rota- 75 9 99 tion into the hole by a drill bit of the drill unit. The
drill bit includes a pilot bit having an axis which coin- 5 References Cited cides with the center line of the drill hole and is paral- UNITED STATES PATENTS lel to and separate from the central axis of the drlll umt wh1ch 1s the line of action of the percussion force. 443,070 12/1890 Chapman l75/l7l 654,981 7/1900 Howarth et al. 175/92 6 Claims, 4 Drawing Figures I JTITT ITUL DRILLING APPARATUS ESPECIALLY FOR GROUND DRILLING The present invention relates to drilling apparatus for drilling in the ground where a drill unit having a drill bit is driven by driving means and coacts with a casing pipe which is sinkable into a hole drilled by the drill unit, the hole having a diameter at least equal to the outside diameter of the casing pipe. The drill unit is guidable in the casing pipe and retractable into it and has a central axis substantially parallel with but spaced from the center line of the drill hole, the central axis being the line of action for a percussion force from the driving means tothe drill unit in the working position of the latter.
When drilling holes in the ground, theproblem often arises that the wall of the hole collapses, partly or completely filling the hole. In order to avoid this it has been a practice to feed a casing pipe into the drill hole as drilling takes place. The difficulty with this is in getting the casing pipe down the hole without using too much force. In loose soils having fine structure, it is possible to let a drill make a hole the same size as the inner diameter of the casing pipe, and simply force the casing pipe down the hole by blows and/or turning from somewhere above ground level. In more stony ground it becomes necessary to be able to drill a hole with a larger diameter than that of the outside diameter of the casing pipe, in order to allow the passage of the casing pipe unhindered by'stones.
This problem has been solved by, among other methods, having a drill unit eccentrically mounted in the casing pipe, the drill unit being retractable into the casing pipe, but means for driving both the drill unit and the casing pipe have been placed above ground as before. The shaft'connection which would then be necessary between drill unit and driving means gives rise to large percussion force transmission losses due to elasticity, play, etc., especially for deep holes. Force-transmission losses arealso significant for the casing pipe, due to its elasticity, and the casing pipe must be fairly heavy as well to withstand any compression loadswhich might arise. A further disadvantage of placing the driving means above ground is the noise problem thus created.
The object of this invention is to' eliminate the above mentioned disadvantages, and construct a drilling apparatus which makes the successive introduction of the casing pipe into the drill hole simple and effective, while still maintaining good drill control.
A further object is to accomplish a drilling apparatus which works quietly and has small force transmission losses.
The drilling apparatus according to theinvention is characterized in that the casing pipe is pullable without rotation into the hole drilled by the drill bit, and in that the drill bit has a ring bit from which protrudes downwards a pilot bit, the central axis of which conincides with the center line of the drill hole and is parallel to and spaced from the central axis of the drill unit and the line of action of the percussion force.
According to an especially advantageous embodiment, the casing pipe is constructed to house the driving means, which is so arranged as to operate the drill unit at the lower part of the casing pipe. Because the casing pipe is pulled into the drill hole, a thinner and lighter casing pipe than those previously used may be employed, and thereby less force will be required to pull the casing pipe down. Also, by placing the driving means in the casing pipe, the driving means does not have to set in motion a long shaft connection, and the whole drive force can thus be concentrated on the drill unit, thereby maximum the efficiency of the apparatus. This position of the driving means also makes effective silencing possible. By providing the drill bit with a special pilot bit, the whole drill unit will revolve about the central axis of the, pilot bit, in this way facilitating guidance of the drill unit. At the same time, the percussion force from the driving means is directed along the central axis of the drill bit, thus eliminating slanting loads.
According to a further advantageous embodiment of the invention, the lower end of the casing pipe has a driving shoe provided with a supporting surface designed to coact, for pulling down the casing pipe, with engaging means arranged around the periphery of the drill unit and shaped to fit against the supporting surface. The supporting surface is shaped as a portion of the surface of a truncated cone having a downwardly directed apex to form a guiding surface whereby the drill unit is guided in the casing.
By providingthe pipe casing with a driving shoe, it will be found that the casing pipe itself can be made even thinner and consequently cheaper and lighter, while the risk of damage to the lower end of the casing pipe is diminished. With the combined guidance of the supporting surface of the driving shoe and the pilot bit. the drill unit receives simple and effective guidance while not taking up space in the casing pipe.
Further advantages and advantageous embodiments of the invention may be seen from the appended description and claims.
In the following, the invention is explained more closely with the help of an embodimentexample shown' on the appended drawings in which:
FIG. 1 schematically shows a drilling apparatus in which the drill unit according to the invention is a part,
FIG. 2 shows a longitudinal section through the drill unit according to-the invention, FIG. 3 shows the drill unit according to FIG. 2 seen from below, and
FIG. 4 shows a section along the line lV-IV in FIG. 2.
The drilling apparatus 1 shown in FIG, 1 includes a casing pipe 2 guiding a drill unit 3, which is connected with and operated by driving means 4, preferably in the form of a sinker drill lowered into the casing pipe. The
drill unit 3, as may be seen in FIG. 2, has two portions united to each other, an adaptor portion 5 and a drill bit 6, the drill bit 6 supporting a cutting unit 7 protruding from casing pipe 2. The cutting unit 7 in turn includes a ring bit 8 and protruding from this a pilot bit 9. A driving shoe 10 is attached to the lower portion of the casing pipe 2, the inside diameter of the shoe being larger than the diameter of the cutting unit 7, so that it is possible for'the cutting unit to pass through the driving shoe, and to withdraw the whole of the drill unit 3 into the casing pipe 2. The drill unit 3 is guided in the casing pipe 2 by engaging means 11 that are arranged around the periphery of the drill bit 6 and rest against a supporting surface 12 on the upper part of the driving shoe 10, so that the central axis 13 of the drill unit 3 which is directed through the center of the cutting unit 7, is essentially parallel with but spaced from the center line 14 of the drill hole. The central axis 13 coincides with the central axis of the adapter portion 5 and is the line of action for a percussion force exerted on the drill unit 3 by the driving means 4.
The pilot bit 9, the center of which coincides with the center line 14 of the drill hole (see also FIG. 3), has a diameter which is less than that of the ring bit 8, and is removably attached to it. When in operation, the drill unit 3 will revolve about the centerline of the pilot bit 9, and'rotate about the central axis 13 so that the point 15 on the ringbit8 will thereby move around the periphery of a drill hole, the diameter of which is made at least as great as the outside diameter of the casing pipe 2.
The adapter portion 5, which acts to transmit driving force from the driving means 4 to the drill unit 3 has, in the embodiment shown here, the shape ofa generally cylindrical shaft, which in its lower end is provided with a substantially spherical ball 16. The ball 16 is housed in a recess 17 in the drill bit 6, and is retained in the recess by a retaining sleeve 18 encircling the adapter portion 5' and screwed or attached in some other way to the drill bit 6. in the position shown in FIG. 2 the ball 16 rests in the bottom of the recess 17 and is supported by a seat 19, the shape of which conforms to the shape of the ball thereby providing a large area for transferring percussive force. From FIG. 4 it may be seen that the ball 16 is provided with two substantially planar side surfaces 20, mutually parallel and parallel also to the longitudinal axis of the adapter portion 5. Side surfaces 20 each abut and act against locking plates 21 (shown with dotted lines in FIG. 2), in the drill bit 6.
By pulling the adapter portion 5 upwards, the side surfaces 20 are pulled along the locking plates 21 until the lower part of sleeve 18 comes into .contact with the ball 16, arresting its continued motion upward. Upon continued pulling, with the adapter portion 5 remaining in its vertical position, the drill bit 6 will pivot in relation to the adapter portion as the ball 16 is pulled towards a lifting surface 22, which is part of the confining wall of the recess 17. The hole through the locking sleeve 18 is, as shown in FIG. 2, so shaped that it allows the drill bit to pivot relative to the adaptor portion around an axis essentially perpendicular to the longitudinal axis of the adapter portion. The pivoting movement described makes it possible to pull the whole drill unit 3 into the casing pipe 2 from the working position shown. The adapter'portion 5 and the drill bit 6 remain, becauseof the locking plates 21, in continuous torque transmitting engagement with each other, and the drill bit can therefore be rotated the whole time to facilitate withdrawal or lowering of the drill unit.
The adapter portion 5 is provided with at least one longitudinal duct 23 for conducting compressed air from the driving means 4. The duct 23 terminates on the lower side of the ball 16, and from there transfers compressed air via a collecting duct 24 to at least one duct 25, and also to a duct 26 which opens into a longitudinal duct 27 through the pilot bit. From each of'the ducts and 27 there are a number of tranched ducts 28 and 29 which terminates on the lower sides of the crown ring bit 8 and the pilot bit 9 respectively, and which conduct the compressed air so that it may cool drilling teeth 30. The compressed air ejected from said ducts takes away drilling dust via openings 31 between engaging means 11.
To prevent foreign matter entering the recess 17, the sleeve 18 is provided with a ring seal 32, but it would also be possible to dispense with the seal 32 and to instead introduce, through one or more ducts in the adapter portion 5, comprssed air into recess 17, and let the air escape through the space between the adapter portion 5 and the sleeve 18. It would also be possible to arrange in the drill bit 6 compressed air ducts connected to the collecting duct 24 and to locate the mouths of these ducts adjacent the upper surface of the sleeve 18, thereby keeping the juncture between the sleeve and the adapter portion clean. it would of course, also be possible to use a combination of seal and introduction of compressed air.
Because the supporting surface 12 of the driving shoe 10 forms a section of the surface of a cone having a downwardly directed apex and as the engaging means 11 are shaped in a corresponding manner, the drill unit is simply and quickly guided to its correct working position in the casing pipe. A certain deformationof the supporting surface 12 is permitted, as it is normal practice to leave the casing pipe behind in the drill hole, there thus being no need to use the driving shoe again. The lower portion of the driving shoe can, if so desired, be equipped with cutting bits, but as a rule this is not necessary. By allowing the driving force on the casing pipe to be applied via the driving shoe, at the lower end of the casing pipe, a tensional load is applied to the pipe walls, and they can therefore be made thinner than a casing pipe that is pressed down by a force applied to the upper end of the casing pipe. If it is required, the casing pipe can also be given a certain degree of rotational movement by a suitable design of the driving shoe and support, or in some other way.
To drill a hole, the operation is begun by placing the casing pipe with its driving shoe against the ground. Then the drill unit and the driving means are lowered into the casing pipe '50 that the drill bit touches the ground (if necessary, the drill unit can be rotated slightly so that the drill bit can get through the driving shoe). Then the casing pipe is raised so that the engaging means 11 engage the support surface 12 and the ball 16 comes to rest against the seat 19. The casing pipe is then aimed in the right direction and drilling can begin. With the help of valves operated by the adapter portion, or in some other way not shown, it is advantageous to arrange that the adapter portion 5 not be subject to percussion force from the driving means 4 before the ball 16 really rests against the seat 19. This is to avoid possible damage to the casing pipe or the driving shoe upon displacement of the drill unit. Both the pilot bit 9 and the adapter portion 5 are suitably provided with teeth or the like vto obtain torque transmitting engagement with the ring bit and the driving means respectively.
When drilling holes in certain types of ground it may be desirable to introduce a liquid stabilizer into the drill hole, and this can suitably take place using the described compressed air ducts or possibly special ducts. The invention described here can naturally be modified in a number of different ways by one skilled in the art within the scope of the following claims.
What is claimed is:
1. Apparatus for drilling a hole in the ground along a center line comprising a casing pipe adapted to be disposed in the hole,
a drill unit received in said casing pipe and having an adaptor portion and a drill bit and a central axis parallel to and spaced from the center line of the hole,
driving means inside said casing pipe supplying torque and percussive force to said drill unit through said adaptor portion and along the central axis of said drill unit,
a generally cylindrical driving shoe attached to the end of said casing pipe and having on its inner side a supporting surface in the general form of a downwardly directed truncated cone, and
engaging means on said drill unit engaging the supporting surface of said driving shoe to pull said casing pipe into the hole without rotation as the hole is drilled,
said drill bit including a ring bit with its center at the central axis of said drill unit and extending beyond said casing pipe to drill a hole wider than said casing pipe and a pilot bit extending from said ring bit with its center at the center line of the hole.
2. Drilling apparatus as claimed in claim 1 wherein said drill bit is pivotable relative to said adaptor portion so that it may be withdrawn into said casing pipe, and
said engaging means acting on the supporting surface of said driving shoe causes said drill bit to assume its working position as it is extended from said casing pipe.
3. Drilling apparatus as claimed in claim 1 wherein ducts are provided through said adaptor portion and through said drill bit so that compressed air can be introduced through said drill unit to the drilling surface.
4. Apparatus for drilling a hole along a center line comprising locking means on said drill bit preventing relative rotational movement between said adaptor portion and said drill bit but allowing pivoting of said drill bit relative to said adaptor portion,
said drill bit including a ring bit and a pilot bit extending therefrom, said ring bit extending outward beyond said casing pipe, and
engaging means on said drill bit to engage said casing pipe to pull it into the hole without rotation,
characterized in that it has a working position in which it extends out from said casing pipe and a retracted position inside said casing pipe and in that in said working position said adaptor portion, and said drill bit have a common central axis parallel to and spaced from the center line of the hole and that in the retracted position said drill bit pivots relative to said adaptor portion to allow said drill bit to be withdrawn into said casing pipe.
5. Apparatus for drilling a hole as claimed in claim 4 wherein said adaptor portion has two ends, a first end operated by said driving means and a second end receiving in said drill bit,
said second end of said adaptor portion has thereon a generally spherical ball having flattened surfaces on opposite vertical sides, and
said locking means on said drill bit abut said flattened surfaces on said ball so that torque is transmitted from said adaptor portion to said drill bit.
6. Apparatus for drilling a hole as claimed in claim 4 wherein a driving shoe is attached to said casing pipe and has an inner supporting surface in the form of a downwardly pointing truncated cone and said engaging means engage the supporting surface on said driving shoe to pull the casing pipe into the hole.

Claims (6)

1. Apparatus for drilling a hole in the ground along a center line comprising a casing pipe adapted to be disposed in the hole, a drill unit received in said casing pipe and having an adaptor portion and a drill bit and a central axis parallel to and spaced from the center line of the hole, driving means inside said casing pipe supplying torgue and percussive force to said drill unit through said adaptor portion and along the central axis of said drill unit, a generally cylindrical driving shoe attached to the end of said casing pipe and having on its inner side a supporting surface in the general form of a downwardly directed truncated cone, and engaging means on said drill unit engaging the supporting surface of said driving shoe to pull said casing pipe into the hole without rotation as the hole is drilled, said drill bit including a ring bit with its center at the central axis of said drill unit and extending beyond said casing pipe to drill a hole wIder than said casing pipe and a pilot bit extending from said ring bit with its center at the center line of the hole.
1. Apparatus for drilling a hole in the ground along a center line comprising a casing pipe adapted to be disposed in the hole, a drill unit received in said casing pipe and having an adaptor portion and a drill bit and a central axis parallel to and spaced from the center line of the hole, driving means inside said casing pipe supplying torgue and percussive force to said drill unit through said adaptor portion and along the central axis of said drill unit, a generally cylindrical driving shoe attached to the end of said casing pipe and having on its inner side a supporting surface in the general form of a downwardly directed truncated cone, and engaging means on said drill unit engaging the supporting surface of said driving shoe to pull said casing pipe into the hole without rotation as the hole is drilled, said drill bit including a ring bit with its center at the central axis of said drill unit and extending beyond said casing pipe to drill a hole wIder than said casing pipe and a pilot bit extending from said ring bit with its center at the center line of the hole.
2. Drilling apparatus as claimed in claim 1 wherein said drill bit is pivotable relative to said adaptor portion so that it may be withdrawn into said casing pipe, and said engaging means acting on the supporting surface of said driving shoe causes said drill bit to assume its working position as it is extended from said casing pipe.
3. Drilling apparatus as claimed in claim 1 wherein ducts are provided through said adaptor portion and through said drill bit so that compressed air can be introduced through said drill unit to the drilling surface.
4. Apparatus for drilling a hole along a center line comprising a casing pipe adapted to be disposed in the hole, a drill unit received in and guided by said casing and including an adaptor portion and an drill bit, driving means received in said casing pipe and supplying torgue and percussive force to said drill unit through said adaptor portion, locking means on said drill bit preventing relative rotational movement between said adaptor portion and said drill bit but allowing pivoting of said drill bit relative to said adaptor portion, said drill bit including a ring bit and a pilot bit extending therefrom, said ring bit extending outward beyond said casing pipe, and engaging means on said drill bit to engage said casing pipe to pull it into the hole without rotation, characterized in that it has a working position in which it extends out from said casing pipe and a retracted position inside said casing pipe and in that in said working position said adaptor portion, and said drill bit have a common central axis parallel to and spaced from the center line of the hole and that in the retracted position said drill bit pivots relative to said adaptor portion to allow said drill bit to be withdrawn into said casing pipe.
5. Apparatus for drilling a hole as claimed in claim 4 wherein said adaptor portion has two ends, a first end operated by said driving means and a second end receiving in said drill bit, said second end of said adaptor portion has thereon a generally spherical ball having flattened surfaces on opposite vertical sides, and said locking means on said drill bit abut said flattened surfaces on said ball so that torque is transmitted from said adaptor portion to said drill bit.
US381556A 1973-07-23 1973-07-23 Drilling apparatus especially for ground drilling Expired - Lifetime US3870114A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US381556A US3870114A (en) 1973-07-23 1973-07-23 Drilling apparatus especially for ground drilling

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US381556A US3870114A (en) 1973-07-23 1973-07-23 Drilling apparatus especially for ground drilling

Publications (1)

Publication Number Publication Date
US3870114A true US3870114A (en) 1975-03-11

Family

ID=23505488

Family Applications (1)

Application Number Title Priority Date Filing Date
US381556A Expired - Lifetime US3870114A (en) 1973-07-23 1973-07-23 Drilling apparatus especially for ground drilling

Country Status (1)

Country Link
US (1) US3870114A (en)

Cited By (45)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4183415A (en) * 1977-11-21 1980-01-15 Stenuick France Drilling apparatus
US4408669A (en) * 1977-04-29 1983-10-11 Sandvik Aktiebolag Means for drilling
US4770259A (en) * 1986-02-24 1988-09-13 Santrade Limited Drill tool
US4962822A (en) * 1989-12-15 1990-10-16 Numa Tool Company Downhole drill bit and bit coupling
US5040621A (en) * 1989-04-05 1991-08-20 Uniroc Aktiebolag Flushing means for drilling tools
US5052503A (en) * 1989-04-05 1991-10-01 Uniroc Aktiebolag Eccentric drilling tool
EP0563950A1 (en) * 1992-04-02 1993-10-06 Ing. Anton Loibelsberger jun. Apparatus and method for directional drilling
US5456326A (en) * 1994-04-18 1995-10-10 Exxon Production Research Company Apparatus and method for installing open-ended tubular members axially into the earth
US6263987B1 (en) 1994-10-14 2001-07-24 Smart Drilling And Completion, Inc. One pass drilling and completion of extended reach lateral wellbores with drill bit attached to drill string to produce hydrocarbons from offshore platforms
US20020189863A1 (en) * 1999-12-22 2002-12-19 Mike Wardley Drilling bit for drilling while running casing
US20030164251A1 (en) * 2000-04-28 2003-09-04 Tulloch Rory Mccrae Expandable apparatus for drift and reaming borehole
US20030173073A1 (en) * 2000-04-17 2003-09-18 Weatherford/Lamb, Inc. Top drive casing system
US20030217865A1 (en) * 2002-03-16 2003-11-27 Simpson Neil Andrew Abercrombie Bore lining and drilling
US20040003490A1 (en) * 1997-09-02 2004-01-08 David Shahin Positioning and spinning device
US20040011531A1 (en) * 1998-12-24 2004-01-22 Weatherford/Lamb, Inc. Apparatus and method for facilitating the connection of tubulars using a top drive
US20040069500A1 (en) * 2001-05-17 2004-04-15 Haugen David M. Apparatus and methods for tubular makeup interlock
US20040108142A1 (en) * 1994-10-14 2004-06-10 Weatherford/Lamb, Inc. Methods and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells
US20040112603A1 (en) * 2002-12-13 2004-06-17 Galloway Gregory G. Apparatus and method of drilling with casing
US20040118613A1 (en) * 1994-10-14 2004-06-24 Weatherford/Lamb, Inc. Methods and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells
US20040123984A1 (en) * 1994-10-14 2004-07-01 Weatherford/Lamb, Inc. Methods and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells
US20040124010A1 (en) * 2002-12-30 2004-07-01 Galloway Gregory G. Drilling with concentric strings of casing
US20040124011A1 (en) * 2002-12-31 2004-07-01 Gledhill Andrew D. Expandable bit with a secondary release device
US20040140128A1 (en) * 1994-10-14 2004-07-22 Weatherford/Lamb, Inc. Methods and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells
US20040173357A1 (en) * 1998-08-24 2004-09-09 Weatherford/Lamb, Inc. Apparatus for connecting tublars using a top drive
US20040194965A1 (en) * 1998-12-24 2004-10-07 Weatherford/Lamb, Inc. Apparatus and method for facilitating the connection of tubulars using a top drive
US20040216924A1 (en) * 2003-03-05 2004-11-04 Bernd-Georg Pietras Casing running and drilling system
US20040226751A1 (en) * 2003-02-27 2004-11-18 Mckay David Drill shoe
US20040251050A1 (en) * 1997-09-02 2004-12-16 Weatherford/Lamb, Inc. Method and apparatus for drilling with casing
US20040251055A1 (en) * 2002-07-29 2004-12-16 Weatherford/Lamb, Inc. Adjustable rotating guides for spider or elevator
US20040251054A1 (en) * 2003-06-12 2004-12-16 Luc Charland System for overburden drilling
US20050000696A1 (en) * 2003-04-04 2005-01-06 Mcdaniel Gary Method and apparatus for handling wellbore tubulars
US6854533B2 (en) 2002-12-20 2005-02-15 Weatherford/Lamb, Inc. Apparatus and method for drilling with casing
US6868906B1 (en) 1994-10-14 2005-03-22 Weatherford/Lamb, Inc. Closed-loop conveyance systems for well servicing
US6896075B2 (en) 2002-10-11 2005-05-24 Weatherford/Lamb, Inc. Apparatus and methods for drilling with casing
US20050269105A1 (en) * 1998-07-22 2005-12-08 Weatherford/Lamb, Inc. Apparatus for facilitating the connection of tubulars using a top drive
US20060124306A1 (en) * 2000-01-19 2006-06-15 Vail William B Iii Installation of one-way valve after removal of retrievable drill bit to complete oil and gas wells
US20060196695A1 (en) * 2002-12-13 2006-09-07 Giroux Richard L Deep water drilling with casing
US20070227777A1 (en) * 2006-03-30 2007-10-04 Sandvik Intellectual Property Ab Down-the-hole hammer with pilot and method of enlarging a hole
WO2007114749A1 (en) * 2006-03-30 2007-10-11 Sandvik Intellectual Property Ab Down-the-hole hammer, percussion bit assembly and method of enlarging a hole
US20070261850A1 (en) * 2006-05-12 2007-11-15 Giroux Richard L Stage cementing methods used in casing while drilling
US20070267221A1 (en) * 2006-05-22 2007-11-22 Giroux Richard L Methods and apparatus for drilling with casing
US7650944B1 (en) 2003-07-11 2010-01-26 Weatherford/Lamb, Inc. Vessel for well intervention
US7730965B2 (en) 2002-12-13 2010-06-08 Weatherford/Lamb, Inc. Retractable joint and cementing shoe for use in completing a wellbore
USRE42877E1 (en) 2003-02-07 2011-11-01 Weatherford/Lamb, Inc. Methods and apparatus for wellbore construction and completion
US9181674B2 (en) 2011-06-27 2015-11-10 Hubbell Incorporated Seismic restraint helical pile systems and method and apparatus for forming same

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US443070A (en) * 1890-12-16 chapman
US654981A (en) * 1899-02-18 1900-07-31 Josef Howarth Boring apparatus.
US1260533A (en) * 1917-07-11 1918-03-26 Henry J Freeon Expanding drill.
US3199616A (en) * 1962-07-10 1965-08-10 Sandvikens Jernverks Ab Drill for rotary percussion drilling
US3277972A (en) * 1962-07-09 1966-10-11 Atlas Copco Ab Rock drilling equipment
US3416616A (en) * 1967-03-01 1968-12-17 Skanska Cementgjuteriet Ab Deep drills with eccentric bits
US3682260A (en) * 1969-05-30 1972-08-08 Gunter Klemm Rotary percussive drill and method

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US443070A (en) * 1890-12-16 chapman
US654981A (en) * 1899-02-18 1900-07-31 Josef Howarth Boring apparatus.
US1260533A (en) * 1917-07-11 1918-03-26 Henry J Freeon Expanding drill.
US3277972A (en) * 1962-07-09 1966-10-11 Atlas Copco Ab Rock drilling equipment
US3199616A (en) * 1962-07-10 1965-08-10 Sandvikens Jernverks Ab Drill for rotary percussion drilling
US3416616A (en) * 1967-03-01 1968-12-17 Skanska Cementgjuteriet Ab Deep drills with eccentric bits
US3682260A (en) * 1969-05-30 1972-08-08 Gunter Klemm Rotary percussive drill and method

Cited By (67)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4408669A (en) * 1977-04-29 1983-10-11 Sandvik Aktiebolag Means for drilling
US4545443A (en) * 1977-04-29 1985-10-08 Sandvik Aktiebolag Means for drilling
US4183415A (en) * 1977-11-21 1980-01-15 Stenuick France Drilling apparatus
US4770259A (en) * 1986-02-24 1988-09-13 Santrade Limited Drill tool
US5040621A (en) * 1989-04-05 1991-08-20 Uniroc Aktiebolag Flushing means for drilling tools
US5052503A (en) * 1989-04-05 1991-10-01 Uniroc Aktiebolag Eccentric drilling tool
US4962822A (en) * 1989-12-15 1990-10-16 Numa Tool Company Downhole drill bit and bit coupling
WO1991009203A1 (en) * 1989-12-15 1991-06-27 Numa Tool Company Downhole drill bit and bit coupling
EP0563950A1 (en) * 1992-04-02 1993-10-06 Ing. Anton Loibelsberger jun. Apparatus and method for directional drilling
US5456326A (en) * 1994-04-18 1995-10-10 Exxon Production Research Company Apparatus and method for installing open-ended tubular members axially into the earth
US20060185906A1 (en) * 1994-10-14 2006-08-24 Vail William B Iii Methods and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells
US20060201711A1 (en) * 1994-10-14 2006-09-14 Vail William B Iii Methods and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells
US20040140128A1 (en) * 1994-10-14 2004-07-22 Weatherford/Lamb, Inc. Methods and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells
US20040123984A1 (en) * 1994-10-14 2004-07-01 Weatherford/Lamb, Inc. Methods and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells
US6263987B1 (en) 1994-10-14 2001-07-24 Smart Drilling And Completion, Inc. One pass drilling and completion of extended reach lateral wellbores with drill bit attached to drill string to produce hydrocarbons from offshore platforms
US7234542B2 (en) 1994-10-14 2007-06-26 Weatherford/Lamb, Inc. Methods and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells
US20040118613A1 (en) * 1994-10-14 2004-06-24 Weatherford/Lamb, Inc. Methods and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells
US6868906B1 (en) 1994-10-14 2005-03-22 Weatherford/Lamb, Inc. Closed-loop conveyance systems for well servicing
US20040108142A1 (en) * 1994-10-14 2004-06-10 Weatherford/Lamb, Inc. Methods and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells
US7013997B2 (en) 1994-10-14 2006-03-21 Weatherford/Lamb, Inc. Methods and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells
US20040003490A1 (en) * 1997-09-02 2004-01-08 David Shahin Positioning and spinning device
US20040251050A1 (en) * 1997-09-02 2004-12-16 Weatherford/Lamb, Inc. Method and apparatus for drilling with casing
US20050269105A1 (en) * 1998-07-22 2005-12-08 Weatherford/Lamb, Inc. Apparatus for facilitating the connection of tubulars using a top drive
US20040173357A1 (en) * 1998-08-24 2004-09-09 Weatherford/Lamb, Inc. Apparatus for connecting tublars using a top drive
US20040011531A1 (en) * 1998-12-24 2004-01-22 Weatherford/Lamb, Inc. Apparatus and method for facilitating the connection of tubulars using a top drive
US20040194965A1 (en) * 1998-12-24 2004-10-07 Weatherford/Lamb, Inc. Apparatus and method for facilitating the connection of tubulars using a top drive
US20060011353A1 (en) * 1998-12-24 2006-01-19 Weatherford/Lamb, Inc. Apparatus and methods for facilitating the connection of tubulars using a top drive
US20020189863A1 (en) * 1999-12-22 2002-12-19 Mike Wardley Drilling bit for drilling while running casing
US20060124306A1 (en) * 2000-01-19 2006-06-15 Vail William B Iii Installation of one-way valve after removal of retrievable drill bit to complete oil and gas wells
US7712523B2 (en) 2000-04-17 2010-05-11 Weatherford/Lamb, Inc. Top drive casing system
US20030173073A1 (en) * 2000-04-17 2003-09-18 Weatherford/Lamb, Inc. Top drive casing system
US7100713B2 (en) 2000-04-28 2006-09-05 Weatherford/Lamb, Inc. Expandable apparatus for drift and reaming borehole
US20030164251A1 (en) * 2000-04-28 2003-09-04 Tulloch Rory Mccrae Expandable apparatus for drift and reaming borehole
US20040069500A1 (en) * 2001-05-17 2004-04-15 Haugen David M. Apparatus and methods for tubular makeup interlock
US20030217865A1 (en) * 2002-03-16 2003-11-27 Simpson Neil Andrew Abercrombie Bore lining and drilling
US7004264B2 (en) 2002-03-16 2006-02-28 Weatherford/Lamb, Inc. Bore lining and drilling
US20040251055A1 (en) * 2002-07-29 2004-12-16 Weatherford/Lamb, Inc. Adjustable rotating guides for spider or elevator
US6896075B2 (en) 2002-10-11 2005-05-24 Weatherford/Lamb, Inc. Apparatus and methods for drilling with casing
US20050205250A1 (en) * 2002-10-11 2005-09-22 Weatherford/Lamb, Inc. Apparatus and methods for drilling with casing
US20060196695A1 (en) * 2002-12-13 2006-09-07 Giroux Richard L Deep water drilling with casing
US20040112603A1 (en) * 2002-12-13 2004-06-17 Galloway Gregory G. Apparatus and method of drilling with casing
US20050217858A1 (en) * 2002-12-13 2005-10-06 Weatherford/Lamb, Inc. Apparatus and method of drilling with casing
US6899186B2 (en) * 2002-12-13 2005-05-31 Weatherford/Lamb, Inc. Apparatus and method of drilling with casing
US7730965B2 (en) 2002-12-13 2010-06-08 Weatherford/Lamb, Inc. Retractable joint and cementing shoe for use in completing a wellbore
US20100139978A9 (en) * 2002-12-13 2010-06-10 Giroux Richard L Deep water drilling with casing
US7938201B2 (en) 2002-12-13 2011-05-10 Weatherford/Lamb, Inc. Deep water drilling with casing
US6854533B2 (en) 2002-12-20 2005-02-15 Weatherford/Lamb, Inc. Apparatus and method for drilling with casing
US20040124010A1 (en) * 2002-12-30 2004-07-01 Galloway Gregory G. Drilling with concentric strings of casing
US6857487B2 (en) 2002-12-30 2005-02-22 Weatherford/Lamb, Inc. Drilling with concentric strings of casing
US20040124011A1 (en) * 2002-12-31 2004-07-01 Gledhill Andrew D. Expandable bit with a secondary release device
US6953096B2 (en) 2002-12-31 2005-10-11 Weatherford/Lamb, Inc. Expandable bit with secondary release device
USRE42877E1 (en) 2003-02-07 2011-11-01 Weatherford/Lamb, Inc. Methods and apparatus for wellbore construction and completion
US20040226751A1 (en) * 2003-02-27 2004-11-18 Mckay David Drill shoe
US7096982B2 (en) 2003-02-27 2006-08-29 Weatherford/Lamb, Inc. Drill shoe
US20040216924A1 (en) * 2003-03-05 2004-11-04 Bernd-Georg Pietras Casing running and drilling system
US20050000696A1 (en) * 2003-04-04 2005-01-06 Mcdaniel Gary Method and apparatus for handling wellbore tubulars
US20040251054A1 (en) * 2003-06-12 2004-12-16 Luc Charland System for overburden drilling
US7182156B2 (en) 2003-06-12 2007-02-27 Luc Charland System for overburden drilling
US7650944B1 (en) 2003-07-11 2010-01-26 Weatherford/Lamb, Inc. Vessel for well intervention
US7673706B2 (en) 2006-03-30 2010-03-09 Sandvik Intellectual Property Ab Down-the-hole hammer with pilot and method of enlarging a hole
WO2007114749A1 (en) * 2006-03-30 2007-10-11 Sandvik Intellectual Property Ab Down-the-hole hammer, percussion bit assembly and method of enlarging a hole
US20070227777A1 (en) * 2006-03-30 2007-10-04 Sandvik Intellectual Property Ab Down-the-hole hammer with pilot and method of enlarging a hole
US20070261850A1 (en) * 2006-05-12 2007-11-15 Giroux Richard L Stage cementing methods used in casing while drilling
US7857052B2 (en) 2006-05-12 2010-12-28 Weatherford/Lamb, Inc. Stage cementing methods used in casing while drilling
US20070267221A1 (en) * 2006-05-22 2007-11-22 Giroux Richard L Methods and apparatus for drilling with casing
US8276689B2 (en) 2006-05-22 2012-10-02 Weatherford/Lamb, Inc. Methods and apparatus for drilling with casing
US9181674B2 (en) 2011-06-27 2015-11-10 Hubbell Incorporated Seismic restraint helical pile systems and method and apparatus for forming same

Similar Documents

Publication Publication Date Title
US3870114A (en) Drilling apparatus especially for ground drilling
US3565192A (en) Earth boring mechanism and coordinated pilot hole drilling and coring mechanisms
EP0534037B1 (en) Disc drill bit
US1971922A (en) Earth boring apparatus
US3231029A (en) Articulated drilling shafts for raise drilling
CN109653682B (en) Drill bit with adjustable drill diameter and hole digging machine
NO311230B1 (en) Wellbore drilling arrangement and method for drilling a borehole into a foundation formation
CN206845098U (en) A kind of down-hole hammer rig of pipe-following drilling
US2642267A (en) Apparatus for initiating and drilling deviating curved bores from existing vertical wll bores
EP0800609A1 (en) A drilling method and bit assembly to realize the method
US4323129A (en) Hole digging apparatus and method
JP2011247082A (en) Kelly for realizing embedded pile
AU2020333796B2 (en) Kelly bar arrangement for a drilling apparatus and method for working the ground
US5368083A (en) Telescopic kelly bar apparatus and method
CN108104720B (en) The non-development blasting machine well drilling technology of hydroenergy storage station pressure pipeline inclined shaft
US2915288A (en) Methods of and apparatus for boring wells, drifts and the like
US7555854B2 (en) Earth auger head and excavation method
US6588509B2 (en) Well casing installation and removal apparatus and method
US4658901A (en) Method of and apparatus for removing stuck well pipe
JPH0137558B2 (en)
CN209261474U (en) Cylinder bores and rotary drilling rig
US2054223A (en) Well drilling system
US3277972A (en) Rock drilling equipment
WO2008147071A1 (en) Hammer bit
KR20200025138A (en) Pile pullout apparatus