US1569729A - Tool for straightening well casings - Google Patents

Description

Jan. 12 1926. 'fzg 0 DUD l TOOL FOR STRAIGHTENING WELL GASINGS Filed Dec. '27, 1923 A TTORNEYS.

Patented dan. l2, 192%.

OSXVALD DUBA, F ,HOUSTONy-TEXA s rA'rsurorrice. f

,y A essrGNoR To YREED'R'OLLER Brrcolvirnn, vor notieren, Yrex. Acenronnrron or TEXAS.

TGOL STRAGE'XTENNG WELL CASINGS.

Appleman filed December 27,1923. 'serial iroyeszee.

Houston, in the county of Harris and State i of Texas, have invented certain new and use- Y ful Tmprovementsin Tools for Sraightening Vell'Casings, of which the following is a specification.

The invention is designed for expanding or straightening out the casings of oil wells or the like. d(lne object of the invention is to provide a tool of rugged construction having the capacity to act on the part to be straightened out by stages, and for this purpese T provide expanding or straightening rolls arranged in a plurality of stages or sets which act in succession upon the part to be expanded or straightened. I also provide means for supplying flushing fluid to the rollers and to the interior of the well casing.

In the drawings- Figure 1 is a part side elevation and vertical sectional view of the tool.

Fig. 2 is a cross sectional View on line 2-2 of Fig. 1.

Fig. 3 isa cross .sectional view of Fig. 1 on line 3 3, and

Fig. t is a cross sectional view on line 4-4 of Fig. 1.

The main body of the tool consists of an part upper portion 5 of cylindrical form, this be-v ing the largest diameter part of thek tool. Relow this large diameter portion there is a downwardly tapering Aportion 6, which merges into a cylindrical portion 7 which is of' smaller diameter than the upper cylindrical portion 5, and below this portion 7 the body is again tapered downwardly, as at 8 and below this is' a still smaller cylindrical portion 9 ending` in a downwardly tapered point 10. Tn the tapered portions of the body lateral recesses 11 are provided, and in the lower set of recesses are mounted rollers 12. These are mounted on bearing pins 13 which are set in inclined positions, convergent downwardly towards the vertical axis of the tool. These pins bear at their upper and lower ends in the body and they are introduced into position through recesses 11i formed in the body of the tool above the upper bearings of the pins. The pins have heads 15. They are retained in place by screw threadedstuds 16.

The rollers are generally of cylindrical form with tapered upper and lower ends. They project from the recesses slightly beyond the body'of the tool to bear on the well casing and they are smooth surfaced though other formations may be employed.

The upperset of inclined rollers 12 are mounted in a mannerV like those just kdescribed, but the body of the tool being of larger diameter herethese rolls stand out further away from the vertical aXis of the tool than ydo the l'set shown at 12. Their ages are parallel with the axes of the rolls They lie as a .set in a horizontal plane somewhat higherthan the horizontal ,plane in which the set of rollers 12 lie, the two sets ofrollers being separated by the cylindrical' portion 7 of the body.- The upper` set of rollers 12 are arranged with their axes parallel with the vertical axis of the tool.

threaded tapered shank by which it may be attached to the pipe by which it is supported andV rotated.

The tool has an axial bore 17 of two different diameters and from the lower end of this channel conduits 18 diverge and have their outlet ends 19 disposed? in vertical ref cessesQO formed in the opposite sides of the lower reduced end of the tool. AlWater or slush is forced down through the central The tool at its upper end has a screw` bore and this is discharged through the cony duits 1 8 and the lateral recesses 20 so as to create a circulation of fluid from the lower end of the tool upwardly along its sides with the effect that the rollers are cooled and lu 1 bricated and any7 material tending` to accumulate within the casing of the well, within which the tool is working, will be washed away and carried to the top of the well where it is discharged. a

This flushing fluid will reach the journal pins through ports 21 formed in the body of the tool.

Tn the operation of the device the two setsv of rollers similarly inclined but located at different levels and at different distances from the axial center of the tool will give a two stage rolling out or straightening action on the deformed part of the casing. The lower set of rollers being nearer the vcenter of the tool will of course act first and after these have performed their action then the second set of rollers l2 come, as the tool is lowered, into play, and perform the second stage of the straightening action, and following this, at an interval, is the smoothing action of the upper series of rollers. employing a two stage inclined roller organization, comparatively short rolls may be used, with comparatively closely set bearings for each roll, enabling short bearing pins to be employed all of which contributes to the rugged character of the tool. Y l

In some instances the lower rolls will have completed their action on vthe deformity and straightened this out to the extent of .the capacity of these rolls before the next-set of inclined rolls begin to perform their work, so that the work is performed gradually, rapidly and with the expenditure of a minimum amount of power.y By carrying the flushing fluid down to the reduced point, it is discharged at a level below all of the rollers so that the return flow will bring the flushing fluid against all of the rollers.

I claim:

l. l-r tool for straightening or expanding deep well casings comprising a rotary body having a lower set of rollers to engage the casing, ano-ther set of rollers at a higher level than the first set, and with its niez'abers located at a greater distance from the vertical axis of the tool than those of the lower set, the rollers of both sets being inclined upwardly and outwardly and at substann tially the same angle with the vertical axis of the tool and pins seated at their ends in the rotary body and on which the rollers turn, said rotary body having a passage for flushing water, substantially as described.

2. A tool for straightening or expanding deep well casings comprising a rotary body having a lower set of rollers to engage the casing, and another set of rollers at a higher level than the first set, and with its men'ibers located at a greater distance from the vertical axis of the tool than those of the lower set, the rollers of both sets being inclined upwardly and outwardly and atsubstantially the same angle with the vertical axis of the tool, the body of the tool having a downwardly tapered portion for each sot of inclined rollers with a substantially cylindrical body portion between the tapered portions, substantially as described.

3. A rotary tool of the character described having a pointed lower portion of reduced diameter, two downwardly tapered portions of different diameter with the larger diameter portion uppermost and with a cylindrical portion spacing apart and connecting the upper and lower adjacent parts of the two tapered portions and having also an upper 'cylindrical portion of a diameter substantially equal to the larger diameter of the upper taperedportion, inclined rollers mounted lin the tapered portions, and rollers in the upper cylindrical portion and slightly projecting therefrom, substantially described.

4. In combination in a rotary tool for straightening well caslings, a body having a large diameter upper portion and a reduced diameter lower portion, rollers mounted in pockets of said portions, said body having its lower end extending below the lower most roller and reduced Iin diameter in respect to the said reduced diameter lower portion, said body having a flushing liuid conduit extending lengthwise thereof from its upper end with ports extending therefrom through the reduced lower end at a point below the lowermost rollers, substantially as described.

In testimony whereof, I aiiix my signature.

OSWALD DUDA;

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