US20100126777A1 - Drilling System with a Barrel Drilling Head Driven by a Downhole Tractor - Google Patents

Drilling System with a Barrel Drilling Head Driven by a Downhole Tractor Download PDF

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Publication number
US20100126777A1
US20100126777A1 US12/597,666 US59766608A US2010126777A1 US 20100126777 A1 US20100126777 A1 US 20100126777A1 US 59766608 A US59766608 A US 59766608A US 2010126777 A1 US2010126777 A1 US 2010126777A1
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Prior art keywords
drilling
drilling system
well
formation
tightening means
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Abandoned
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US12/597,666
Inventor
Jørgen Hallundbæk
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Welltec AS
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Welltec AS
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Assigned to WELLTEC A/S reassignment WELLTEC A/S ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HALLUNDBAEK, JORGEN
Assigned to CITIBANK, N.A., LONDON BRANCH reassignment CITIBANK, N.A., LONDON BRANCH SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: WELLTEC A/S
Abandoned legal-status Critical Current

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    • 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
    • E21B25/00—Apparatus for obtaining or removing undisturbed cores, e.g. core barrels, core extractors
    • 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
    • E21B23/00—Apparatus for displacing, setting, locking, releasing, or removing tools, packers or the like in the boreholes or wells
    • E21B23/001—Self-propelling systems or apparatus, e.g. for moving tools within the horizontal portion of a borehole

Definitions

  • the present invention relates to a drilling system for drilling out a sample of a subterranean formation, a well, or the like downhole, comprising a drilling head having an at least partly hollow cylindrical body with a circumferential rim, which has at least one cutting edge, a longitudinal axis going through a centre of the cylindrical body, and a driving unit for rotating the cylindrical body and the cutting edge for cutting a piece out of the formation.
  • Drilling systems are used when drilling a well in a subterranean formation or for taking out a sample of the formation before drilling any further.
  • Known drilling systems for taking out a sample are constructed from a long line of pipes, the system thus extending from above surface to a destination downhole where the sample is to be taken.
  • the system is mounted by mounting one pipe onto another just before the drilling operation on the drilling rig.
  • the extension of the pipes put together makes the mounting process complicated, and the process is moreover time consuming.
  • coiled tubing i.e. a long, continuous length of pipe wound on a spool.
  • the pipe is straightened prior to pushing into a wellbore and rewound to coil the pipe back onto the transport and storage spool.
  • the equipment for coiled tubing drilling still takes a long time to transport to the site.
  • coiled tubing drilling still uses the force of gravity to create WOB, and thus does not solve the problem of drilling horizontally.
  • An aspect of the present invention is, at least partly, to overcome the disadvantages of the drilling systems mentioned above, and to provide an improved drilling system which is able to take out a sample of the formation without getting stuck.
  • a drilling system for drilling out a sample of a formation, a well, or the like downhole comprising:
  • a drilling head comprising:
  • a driving unit for rotating the cylindrical body and the cutting edge for cutting a piece out of the formation
  • a driving tool such as a downhole tractor for driving the drilling head forward in the well or formation.
  • the drilling system can drill horizontally into the formation for drilling a branch well or taking out a sample for further investigation.
  • the drilling operation can be performed substantially faster than when using coiled tubing or jointed pipes, since the equipment for using coiled tubing or jointed pipes takes longer time to transport to the operation site and takes longer time to prepare at the operation site.
  • a downhole tractor may easily and quickly be transported to the operation site compared to the equipment necessary for coiled tubing operations, and the preparation time at the operation site is thus substantially decreased, if not eliminated.
  • the downhole tractor has proven to be efficient enough to use for drilling operations also, since it can provide a sufficient WOB.
  • the downhole tractor may be connected to and powered through a wireline.
  • the drilling system may further comprise at least one tightening means for providing a closing of the well above the drilling head for preventing a blowout.
  • the well or hole in the formation can be divided into an upper part in relation to the bottom of the well or hole and a lower part comprising the drilling system or at least most of it. In this way, a blowout can be prevented without use of chemicals creating a differential pressure, and thus without risking that the system gets differentially stuck.
  • the tightening means may be expandable.
  • the cylindrical body may have a closed end opposite the cutting edge.
  • the circumferential rim may have a plurality of cutting edges.
  • the circumferential wall may have at least one slot.
  • the hollow body may have a length up to 10 metres.
  • the drilling system may further comprise a gas cartridge or a pump for inflation of the tightening means with gas or fluid from the well.
  • FIG. 1 shows a drilling system according to the invention
  • FIG. 2 shows another embodiment of the drilling system according to the invention.
  • FIG. 1 shows a drilling system 1 according to the present invention comprising a barrel drilling head 2 , a driving unit 6 for rotating the barrel drilling head 2 , and a driving tool 8 such as a downhole tractor.
  • the drilling system 1 is submerged into the well or subterranean formation 10 by the driving tool 8 which is powered through a wireline 11 by a power means above surface.
  • the drilling head 2 is rotationally driven by the driving unit 6 at a certain speed, and the weight on bit (WOB) is controlled by the driving unit 6 so that the longitudinal displacement of the cutting edge 5 towards e.g. the formation 10 is held constant during the drilling process.
  • WOB weight on bit
  • the drilling system 1 can also drill horizontally, e.g. for taking out samples 7 horizontally.
  • the drilling head 2 has a partly hollow cylindrical body 3 that is closed at one end 13 and has a circumferential rim 4 at the other end.
  • the circumferential rim 4 has at least one cutting edge 5 which, when rotated by the driving unit 6 , cuts out a piece 7 or sample 7 of the formation 10 .
  • the drilling system 1 can be used for both for drilling a well downhole and for taking out samples 7 for further investigation.
  • the drilling head 2 Due to the fact that the drilling head 2 has a hollow cylindrical body 3 , the drilling head 2 is able to receive the sample 7 that is being cut out and bring it up with the rest of the system 1 .
  • the inside of the hollow body 3 is 6 metres in depth, and the drilling system 1 is therefore able to cut out a sample 7 of almost 6 metres.
  • the hollow body 3 may be as long as 10 metres.
  • the drilling system 1 further comprises a tightening means 9 positioned around the wireline 11 for closing a lower part of the well in order to prevent a blowout without using chemicals.
  • the tightening means 9 is expandable.
  • the expandable tightening means 9 is in the form of an expandable ring blown up by gas positioned in a gas chamber 12 or a gas cartridge 12 within the drilling system 1 .
  • the fluid surrounding the drilling system 1 is used to expand the tightening means 9 by use of a pump 14 and a filter for filtrating the fluid before it is pumped into the tightening means 9 .
  • the pump 14 and the filter are positioned in the part of the drilling system 1 between the connection to the wireline 11 and the downhole tractor 8 .
  • the tightening means 9 may also be positioned around the downhole tractor 8 as shown in FIG. 2 .
  • the tightening means 9 need not be expanded as much as when positioned around the wireline, and the tightening means 9 can also be non-expandable, e.g. a rubber ring.
  • the expansion of the tightening means 9 is quicker and easier since the volume of the tightening means 9 need not be as large as if positioned around the wireline 11 , and the gas chamber 12 , gas cartridge 12 , or pump 14 can be positioned in the side of the downhole tractor 8 providing a quick inflation of the tightening means 9 .
  • the driving unit 6 is an electrical motor which drives the drilling head 2 .
  • the motor 6 has a shaft for driving the drilling head 2 .
  • the shaft may be connected to the drilling head 2 through a gear connection. In this way, one drilling head 2 may be replaced by another drilling head 2 .
  • the drilling system 1 comprises a pump 14 which may be any kind of suitable pump.
  • the pump 14 is a one-step centrifugal pump, but in another embodiment the pump 14 may be a multi-step centrifugal pump, a jet pump, or a piston pump.

Abstract

A drilling system for drilling out a sample of a formation, a well, or the like downhole. The drilling system has a drilling head having an at least partly hollow cylindrical body with a circumferential rim. The circumferential rim has at least one cutting edge. Furthermore, the drilling system has a driving unit for rotating the cylindrical body and the cutting edge for cutting a piece out of the formation, and a driving tool such as a downhole tractor for driving the drilling head forward in the well or formation.

Description

    TECHNICAL FIELD
  • The present invention relates to a drilling system for drilling out a sample of a subterranean formation, a well, or the like downhole, comprising a drilling head having an at least partly hollow cylindrical body with a circumferential rim, which has at least one cutting edge, a longitudinal axis going through a centre of the cylindrical body, and a driving unit for rotating the cylindrical body and the cutting edge for cutting a piece out of the formation.
    • BACKGROUND
  • Drilling systems are used when drilling a well in a subterranean formation or for taking out a sample of the formation before drilling any further.
  • Known drilling systems for taking out a sample are constructed from a long line of pipes, the system thus extending from above surface to a destination downhole where the sample is to be taken. The system is mounted by mounting one pipe onto another just before the drilling operation on the drilling rig. The extension of the pipes put together makes the mounting process complicated, and the process is moreover time consuming.
  • However, the long line of pipes creates a Weight On Bit (WOB) by the force of gravity which is needed for drilling downhole. Such a system creating weight on bit by the force of gravity is not very useful when drilling horizontally, e.g. for taking out a sample, since the force of gravity is substantially decreased when the pipes extend horizontally.
  • Another known type of drilling system uses coiled tubing, i.e. a long, continuous length of pipe wound on a spool. The pipe is straightened prior to pushing into a wellbore and rewound to coil the pipe back onto the transport and storage spool. Although substantially less time consuming than the system described above, the equipment for coiled tubing drilling still takes a long time to transport to the site. Moreover, coiled tubing drilling still uses the force of gravity to create WOB, and thus does not solve the problem of drilling horizontally.
  • Therefore, there is a need for a drilling system which is able to take out samples also when drilling horizontally.
  • Furthermore, in order to prevent a blowout when drilling downhole, the fluid in the well is mixed with a number of chemicals for making a differential pressure downhole. However, due to the differential pressure, the above-mentioned systems sometimes get differentially stuck.
  • Thus, there is also a need for a drilling system reducing or even eliminating the risk of downhole systems getting differentially stuck.
    • DESCRIPTION OF THE INVENTION
  • An aspect of the present invention is, at least partly, to overcome the disadvantages of the drilling systems mentioned above, and to provide an improved drilling system which is able to take out a sample of the formation without getting stuck.
  • This aspect and the advantages becoming evident from the description below are obtained by a drilling system for drilling out a sample of a formation, a well, or the like downhole, comprising:
  • a drilling head comprising:
      • an at least partly hollow cylindrical body with a circumferential rim and a longitudinal axis going through a centre of the cylindrical body, the circumferential rim having at least one cutting edge,
  • a driving unit for rotating the cylindrical body and the cutting edge for cutting a piece out of the formation, and
  • a driving tool such as a downhole tractor for driving the drilling head forward in the well or formation.
  • By having a driving tool for driving the drilling head forward and provide a weight on bit, the drilling system can drill horizontally into the formation for drilling a branch well or taking out a sample for further investigation.
  • By combining a downhole tractor and a drilling head, the drilling operation can be performed substantially faster than when using coiled tubing or jointed pipes, since the equipment for using coiled tubing or jointed pipes takes longer time to transport to the operation site and takes longer time to prepare at the operation site. A downhole tractor may easily and quickly be transported to the operation site compared to the equipment necessary for coiled tubing operations, and the preparation time at the operation site is thus substantially decreased, if not eliminated. Moreover, the downhole tractor has proven to be efficient enough to use for drilling operations also, since it can provide a sufficient WOB.
  • In one embodiment, the downhole tractor may be connected to and powered through a wireline.
  • In addition, the drilling system may further comprise at least one tightening means for providing a closing of the well above the drilling head for preventing a blowout.
  • By having a tightening means, the well or hole in the formation can be divided into an upper part in relation to the bottom of the well or hole and a lower part comprising the drilling system or at least most of it. In this way, a blowout can be prevented without use of chemicals creating a differential pressure, and thus without risking that the system gets differentially stuck.
  • In one embodiment, the tightening means may be expandable.
  • Moreover, the cylindrical body may have a closed end opposite the cutting edge.
  • In another embodiment, the circumferential rim may have a plurality of cutting edges.
  • In addition, the circumferential wall may have at least one slot.
  • In yet another embodiment, the hollow body may have a length up to 10 metres.
  • Moreover, the drilling system may further comprise a gas cartridge or a pump for inflation of the tightening means with gas or fluid from the well.
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • The invention is explained in detail below with reference to the drawings, in which
  • FIG. 1 shows a drilling system according to the invention, and
  • FIG. 2 shows another embodiment of the drilling system according to the invention.
    •
  • The drawings are merely schematic and shown for an illustrative purpose.
    • DETAILED DESCRIPTION OF THE INVENTION
  • FIG. 1 shows a drilling system 1 according to the present invention comprising a barrel drilling head 2, a driving unit 6 for rotating the barrel drilling head 2, and a driving tool 8 such as a downhole tractor. The drilling system 1 is submerged into the well or subterranean formation 10 by the driving tool 8 which is powered through a wireline 11 by a power means above surface.
  • The drilling head 2 is rotationally driven by the driving unit 6 at a certain speed, and the weight on bit (WOB) is controlled by the driving unit 6 so that the longitudinal displacement of the cutting edge 5 towards e.g. the formation 10 is held constant during the drilling process.
  • Due to the fact that the weight on bit (WOB) is created by the driving unit 6 and not just by the force of gravity, the drilling system 1 can also drill horizontally, e.g. for taking out samples 7 horizontally.
  • The drilling head 2 has a partly hollow cylindrical body 3 that is closed at one end 13 and has a circumferential rim 4 at the other end. The circumferential rim 4 has at least one cutting edge 5 which, when rotated by the driving unit 6, cuts out a piece 7 or sample 7 of the formation 10. In this way, the drilling system 1 can be used for both for drilling a well downhole and for taking out samples 7 for further investigation.
  • Due to the fact that the drilling head 2 has a hollow cylindrical body 3, the drilling head 2 is able to receive the sample 7 that is being cut out and bring it up with the rest of the system 1. In this embodiment, the inside of the hollow body 3 is 6 metres in depth, and the drilling system 1 is therefore able to cut out a sample 7 of almost 6 metres. In another embodiment, the hollow body 3 may be as long as 10 metres.
  • As shown in FIG. 1, the drilling system 1 further comprises a tightening means 9 positioned around the wireline 11 for closing a lower part of the well in order to prevent a blowout without using chemicals.
  • In this embodiment, the tightening means 9 is expandable. The expandable tightening means 9 is in the form of an expandable ring blown up by gas positioned in a gas chamber 12 or a gas cartridge 12 within the drilling system 1. In another embodiment, the fluid surrounding the drilling system 1 is used to expand the tightening means 9 by use of a pump 14 and a filter for filtrating the fluid before it is pumped into the tightening means 9. Preferably, the pump 14 and the filter are positioned in the part of the drilling system 1 between the connection to the wireline 11 and the downhole tractor 8.
  • The tightening means 9 may also be positioned around the downhole tractor 8 as shown in FIG. 2. Hereby, the tightening means 9 need not be expanded as much as when positioned around the wireline, and the tightening means 9 can also be non-expandable, e.g. a rubber ring. Thus, the expansion of the tightening means 9 is quicker and easier since the volume of the tightening means 9 need not be as large as if positioned around the wireline 11, and the gas chamber 12, gas cartridge 12, or pump 14 can be positioned in the side of the downhole tractor 8 providing a quick inflation of the tightening means 9.
  • The driving unit 6 is an electrical motor which drives the drilling head 2. The motor 6 has a shaft for driving the drilling head 2. The shaft may be connected to the drilling head 2 through a gear connection. In this way, one drilling head 2 may be replaced by another drilling head 2.
  • For providing a differential pressure below the expandable means 9, the drilling system 1 comprises a pump 14 which may be any kind of suitable pump. In this embodiment, the pump 14 is a one-step centrifugal pump, but in another embodiment the pump 14 may be a multi-step centrifugal pump, a jet pump, or a piston pump.

Claims (13)

1. Drilling system for drilling out a sample of a formation, a well, or the like downhole, comprising:
a barrel drilling head comprising:
an at least partly hollow cylindrical body with a circumferential rim, the circumferential rim having at least one cutting edge,
a driving unit for rotating the cylindrical body and the cutting edge for cutting a piece out of the formation, and
a driving tool such as a downhole tractor for driving the barrel drilling head forward in the well or formation.
2. The drilling system according to claim 1, wherein the downhole tractor is connected to and powered through a wireline.
3. The drilling system according to claim 1, further comprising at least one tightening means for providing a closing of the well above the drilling head for preventing a blowout.
4. The drilling system according to claim 3, wherein the tightening means is expandable.
5. The drilling system according to claim 1, wherein the cylindrical body has a closed end opposite the cutting edge.
6. The drilling system according to claim 1, wherein the circumferential rim has a plurality of cutting edges.
7. The drilling system according to claim 1, wherein the circumferential wall has at least one slot.
8. The drilling system according to claim 1, wherein the hollow body has a length of up to 10 metres.
9. The drilling system according to claim 1, further comprising a gas cartridge or a pump for inflation of the tightening means with gas or fluid from the well.
10. Use of a downhole tractor for driving a barrel drilling head forward in the well or formation, wherein the barrel drilling head comprises:
an at least partly hollow cylindrical body with a circumferential rim, the circumferential rim having at least one cutting edge, and wherein the barrel drilling head is rotated by a driving unit for cutting a piece out of the formation.
11. The use according to claim 10, wherein the downhole tractor is connected to and powered through a wireline.
12. The use according to claim 11, wherein at least one tightening means is providing above the drilling head around the wireline or the driving unit for a closing of the well and preventing a blowout.
13. The use according to claim 12, wherein the tightening means is expandable.
US12/597,666 2007-04-26 2008-04-28 Drilling System with a Barrel Drilling Head Driven by a Downhole Tractor Abandoned US20100126777A1 (en)

Applications Claiming Priority (3)

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DKPA200700615 2007-04-26
DKPA200700615 2007-04-26
PCT/DK2008/000160 WO2008131772A2 (en) 2007-04-26 2008-04-28 Drilling system with a barrel drilling head driven by a downhole tractor

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US (1) US20100126777A1 (en)
EP (1) EP2140100A2 (en)
CN (1) CN101680281A (en)
AU (1) AU2008243507A1 (en)
BR (1) BRPI0810856A2 (en)
CA (1) CA2684715A1 (en)
MX (1) MX2009011460A (en)
WO (1) WO2008131772A2 (en)

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US20110169724A1 (en) * 2010-01-08 2011-07-14 Qualcomm Mems Technologies, Inc. Interferometric pixel with patterned mechanical layer
US8736939B2 (en) 2011-11-04 2014-05-27 Qualcomm Mems Technologies, Inc. Matching layer thin-films for an electromechanical systems reflective display device
US8963159B2 (en) 2011-04-04 2015-02-24 Qualcomm Mems Technologies, Inc. Pixel via and methods of forming the same
US8979349B2 (en) 2009-05-29 2015-03-17 Qualcomm Mems Technologies, Inc. Illumination devices and methods of fabrication thereof

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EP2458139A1 (en) * 2010-11-26 2012-05-30 Welltec A/S Downhole valve
CN102175609B (en) * 2010-12-31 2013-02-20 聚光科技(杭州)股份有限公司 Measuring method and device of water content of fuel
WO2013187898A1 (en) 2012-06-14 2013-12-19 Halliburton Energy Services, Inc. Well tractor
CN105649540B (en) * 2015-12-28 2018-03-13 中国石油天然气股份有限公司 A kind of drilling tool

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US8979349B2 (en) 2009-05-29 2015-03-17 Qualcomm Mems Technologies, Inc. Illumination devices and methods of fabrication thereof
US9121979B2 (en) 2009-05-29 2015-09-01 Qualcomm Mems Technologies, Inc. Illumination devices and methods of fabrication thereof
US20110169724A1 (en) * 2010-01-08 2011-07-14 Qualcomm Mems Technologies, Inc. Interferometric pixel with patterned mechanical layer
US8963159B2 (en) 2011-04-04 2015-02-24 Qualcomm Mems Technologies, Inc. Pixel via and methods of forming the same
US8736939B2 (en) 2011-11-04 2014-05-27 Qualcomm Mems Technologies, Inc. Matching layer thin-films for an electromechanical systems reflective display device
US9081188B2 (en) 2011-11-04 2015-07-14 Qualcomm Mems Technologies, Inc. Matching layer thin-films for an electromechanical systems reflective display device

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CA2684715A1 (en) 2008-11-06
AU2008243507A1 (en) 2008-11-06
MX2009011460A (en) 2009-11-10
CN101680281A (en) 2010-03-24
WO2008131772A2 (en) 2008-11-06
EP2140100A2 (en) 2010-01-06
WO2008131772A3 (en) 2009-02-05
BRPI0810856A2 (en) 2014-10-29

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Owner name: WELLTEC A/S, DENMARK

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:HALLUNDBAEK, JORGEN;REEL/FRAME:027615/0194

Effective date: 20120130

AS Assignment

Owner name: CITIBANK, N.A., LONDON BRANCH, UNITED KINGDOM

Free format text: SECURITY INTEREST;ASSIGNOR:WELLTEC A/S;REEL/FRAME:027637/0737

Effective date: 20120201

STCB Information on status: application discontinuation

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