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Publication numberUS2712434 A
Publication typeGrant
Publication dateJul 5, 1955
Filing dateNov 23, 1953
Priority dateNov 23, 1953
Publication numberUS 2712434 A, US 2712434A, US-A-2712434, US2712434 A, US2712434A
InventorsGiles Melvin L, Wells Carl L
Original AssigneeGiles Melvin L, Wells Carl L
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Directional drilling tool
US 2712434 A
Abstract  available in
Images(1)
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Claims  available in
Description  (OCR text may contain errors)

July 5, 1955 M. L. GILES ET AL DIRECTIONAL DRILLING TOOL Filed Nov. 23, 1955 M64 WM 4. 6/455 6342.4 4. M5445 INVENTOR.

flrraeueus United States Patent DIRECTIGNAL DRILLING TOOL Melvin L. Giles and Carl L. Wells, Bakersfield, Calif.

Application November 23, 1953, Serial No. 393,758

3 Claims. 01. 255-.--1.6)

This invention relates to a directional drilling tool for use in conjunction with a rotary drill stem in drilling wells. p

An object of the invention is to provide a relatively simple, sturdy directional drilling tool which may be incorporated in the drill stem between the drill collar and the bottom of the drill pipe that will cause the top of the collar to be laterally displaced with respect to the axis of the hole that is being drilled by the drilling bit. In this manner, as the drill collar is caused to assume a slightly inclined position with respect to the axis of the hole the bit will be laterally directed and thus cause the further drilling of the hole to return to vertical if the hole has been deviated from the vertical, or causing the further drilling of the hole to deviate from the vertical if directional drilling is desired.

Another object of the invention is to provide a directional drilling tool having the above-mentioned characteristics which consists essentially of a hollow mandrel that may be incorporated in the drill stem between the drill collar and the drill pipe and which has rotatably mounted thereon an eccentric bushing. This bushing is confined against vertical displacement with respect to the mandrel by opposed shoulders and has vertical passages on the exterior thereof for the upward flow of circulation fluid. The external diameter of the eccentric bushing is substantially equal to the diameter of the hole that is being drilled by the bit and a one-way clutch mechanism is arranged between the mandrel and the bushing so that the bushing can be properly oriented or positioned in the hole to cause the bit to be directed in the desired direction. After having been thus properly positioned the drill pipe and mandrel are normally rotated in the opposite direction wherein the mandred may freely rotate relatively to the bushing without disturbing its position.

With the foregoing and other objects in view, which will be made manifest in the following detailed description and specifically pointed out in the appended claims, reference is had to the accompanying drawings for an illustrative embodiment of the invention, wherein:

Figure l is a partial view in vertical section through a well that is being drilled, illustrating the direction drilling tool embodying the present invention as having been incorporated in the drill stem;

Fig. 2 is a vertical section through the directional drilling tool; and

3 is a horizontal section taken substantially upon the line 33 upon Fig. 2.

Referring to the accompanying drawings wherein similar reference characters designate similar parts throughout, we have illustrated in Fig. 1 a somewhat conventional rotary drill stem consisting of a well drilling bit above which there is frequently a reamer or bit stabilizer indicated at 11. Above the bit stabilizer there is a conventional drill collar 12 which is normally connected to the drill pipe 13. The drill pipe 13 is rotated by the rotary table at the surface and causes the drill collar 2 12 and the bit 11 to be rotated thereby in the course of drilling the well.

The directional drilling tool embodying the present invention consists of a hollow mandrel 14 threaded at its endsfor attachment to the top of the drill collar 12 and the bottom of the drill pipe 13, respectively. This mandrel is externally threaded near its ends as indicated at E5 and 16 to receive shoulder-providing thrust collars 17 and 18, respectively. These thrust collars may be locked in position on the mandrel by set screws 19 orthe equivalent. Between the thrust collars 17 and 18 there is dis posed an eccentric bushing 20. This bushing is rotatable on the mandrel between the thrust collars and has an overall external diameter substantially equal to the gauge diameter of the bit 10 so that the bushing when positioned in the hole H will substantially fill the hole. On the exterior of the bushing there are vertical flutes or passages 21 which provide for the upward passage of circulation fluid that is discharged from the bit 10.

On the exterior of the mandrel there is formed a tooth or radial shoulder 22 which faces toward the left or in-a counterclockwise direction as viewed in Fig. 3 This radial shoulder is arranged at one end of a cam-shaped groove on the mandrel. in the eccentric bushing 20 there is a radial bore 23 in which is slidable a springactuated detent 24. This detent is urged inwardly by a compression spring 25 that is confined in the bore by a plug 26.

When it is desired to change the direction in vwhich the well hole H is being drilled by the bit 10, the mandrel, together with its thrust collars and bushing, is inserted in the drill stem between the drill collar 12 and the drill pipe 13. The drill stem is then lowered into the hole H until the bit it) substantially reaches the bottom of the hole. During the lowering of the drill stem the eccentric bushing merely slides downwardly through the hole and circulation fluid may pass upwardly through the passage 21. In order to properly orient or position the bushing the drill pipe is then rotated to the left, causing the mandrel 14 to also rotate to the left. When the shoulder 22 engages the detent 24 rotation of the mandrel relatively to the bushing is arrested. Consequently, the bushing will thereafter be caused to rotate with the mandrel. The bushing is then rotated until it has been properly positioned to cause the bit 19 to be directed in the desired direction. Thereafter, the drill pipe is rotated to the right in the conventional manner and drilling proceeds. During this rotation to the right the mandrel merely rotates within the eccentric bushing without disturbing the position of the bushing inasmuch as the detent 24 is merely camrned out of the recess behind the shoulder 22 and as the shoulder passes beneath the detent, the detent snaps back into the recess under the action of the spring 25. in other words, the shoulder 22 and detent 24 form a type of one-way clutch which enables the sleeve to be properly positioned by the drill stem in the hole when the drill stem is rotated in one direction, but permits the drfll stem to be freely rotated relative to the bushing when the drill stem is rotated in the opposite direction.

When the bushing has been properly positioned it will be noted from an inspection of Fig. 1 that the top of the drill collar has been displaced laterally in the hole so that the axis of the drill collar is slightly inclined relatively to the axis of the hole. if the bit It has a 10% gauge diameter the overall diameter of the bushing is also 10%". The eccentricity of the bushing is such that its geometrical center is spaced 1%" from the center of the mandrel. With such dimensions when the tool is mounted on top of a 19 drill collar, the arrangement is such as to cause the bit It? to start drilling with 8. 1 deviation from the direction of the hole previously drilled.

As drilling proceeds the bushing slides down the hole and this 1 deviation becomes cumulative. In this manner,

V the amount of deviation given the hole can be ascertained V erably relatively soft so that if occasion should require a washover tool may be lowered into the Well and the eccentric bushing can be drilledup. For this reason the inner-end of the spring 25 is preferably recessed in the detent 24 so that this detent which is ordinarily formed of hard material, will not have any substantial mass thereof projecting outwardly beyond the diameters of the collars '17 and 18.

- From the above-described construction it will be appreciated that an improved directional drilling tool is provided which is very simple in construction, very durable, and highly efiicient in its operation.

7 Various changes may be made in the details of construction without departing from the spirit and scope of the invention as defined by the appended claims.

We claim:

. 1. In combination with a rotary drill stem having a drill pipe, a bit, and a drill collar between the bit and the drillpipe, an eccentric bushing having an external diameter substantially equal to the diameter of the hole drilled by the bit, means for rotatably mounting the bushing between the top of the drill collar and the drill pipe whereby the drill pipe and drill collar mayrotate relatively to the bushing and the top of the drill collar will 1 be held laterally displaced by the bushing relative to the axis of the hole drilled by the bit, and means for arresting rotation'of the bushing relative to the drill pipe and drill collar in one direction whereby the bushing may be properly oriented thereby in the hole.

2. A device for directional drilling comprising a hollow mandrel, means at the ends of the mandrel by which the ends may be connected to the top of a drill collar and the bottom of a drill pipe respectively, an eccentric bushing rotatably mounted on the mandrel, shoulder means for holding the bushing against vertical displacement on the mandrel, there being vertical fluid passages on the exterior of the bushing for the flow of circulation fluid therethrough, and one-Way clutch means between the bush- 'ing and the mandrel enabling the bushing to be oriented by the mandrel in the hole but also enabling the mandrel to freely rotate relative tothe bushing. in the opposite direction.

3. A device for directional drilling comprising a hollow mandrel, means at the ends of the mandrel by which the ends may be connected to the top of a drill collar and the bottom'of a drill pipe respectively, an eccentric bushingrotatably mounted on the mandrel, shoulder means for holding the bushing against vertical displacement on the mandrel, there being vertical fluidpassages on the exterior of the bushing for the flow of circulation fluid therethrough, there being a radialtshoulder on the mandrel facing in one direction, and a spring-actuated pawl in the bushing engageable with the shoulder to arrest rotation of the mandrel relative to the bushing in one direction but not in the other.

Buttolph Mar. 18, 1952

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2072320 *Dec 19, 1934Mar 2, 1937Thomas Charles EBit guide
US2316409 *Dec 5, 1941Apr 13, 1943Downing Lloyd ROil well straightener
US2498192 *Aug 24, 1944Feb 21, 1950Eastman Oil Well Survey CoWell-drilling apparatus
US2589534 *Jul 28, 1947Mar 18, 1952Buttolph Ralph QDrill guiding assembly
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2864601 *Aug 6, 1956Dec 16, 1958Salem Tool CoAuger boring head with non-rotating barrel
US2919897 *Jul 7, 1958Jan 5, 1960Regan Forge & Eng CoDeflection drilling tool
US2979142 *Jul 3, 1957Apr 11, 1961Phillips Petroleum CoApparatus for drilling wells
US3045767 *Nov 28, 1958Jul 24, 1962Eugene GrahamApparatus for directional drilling of wells
US3098534 *Jun 14, 1960Jul 23, 1963Denver Wood MerlinDirectional drill with hydraulically extended shoe
US3156310 *Dec 7, 1959Nov 10, 1964Eastman Oil Well Survey CoStabilized knuckle joint
US3306378 *Mar 16, 1965Feb 28, 1967David B WilliamsDrill collar
US3352370 *Aug 31, 1964Nov 14, 1967Livingston Herman GDirectional drilling tool
US3363704 *Mar 24, 1966Jan 16, 1968Whipstock IncDirectional drilling tool
US3596721 *Jan 27, 1969Aug 3, 1971Rolls RoyceApparatus for deviation borehole drilling
US4220213 *Dec 7, 1978Sep 2, 1980Hamilton Jack EMethod and apparatus for self orienting a drill string while drilling a well bore
US4319649 *Jun 18, 1973Mar 16, 1982Jeter John DStabilizer
US4465147 *Jan 31, 1983Aug 14, 1984Shell Oil CompanyMethod and means for controlling the course of a bore hole
US4471843 *Apr 23, 1982Sep 18, 1984Conoco Inc.Method and apparatus for rotary drill guidance
US4501336 *Jun 3, 1982Feb 26, 1985Kemp Billy WMethod and apparatus of a self-aligning sleeve for the correction of the direction of deviated boreholes
US4623026 *Jul 20, 1984Nov 18, 1986Kemp Billy WMethod and apparatus of a self-aligning sleeve for the correction of the direction of deviated boreholes
US4699224 *May 12, 1986Oct 13, 1987Sidewinder Joint VentureMethod and apparatus for lateral drilling in oil and gas wells
US5094304 *Sep 24, 1990Mar 10, 1992Drilex Systems, Inc.Double bend positive positioning directional drilling system
US5101912 *Jan 15, 1991Apr 7, 1992Marc SmetSteerable ground drilling devices
US5213168 *Nov 1, 1991May 25, 1993Amoco CorporationApparatus for drilling a curved subterranean borehole
US6601658Nov 10, 2000Aug 5, 2003Schlumberger Wcp LtdControl method for use with a steerable drilling system
US6962214Dec 18, 2001Nov 8, 2005Schlumberger Wcp Ltd.Rotary seal for directional drilling tools
US7136795Jul 1, 2003Nov 14, 2006Schlumberger Technology CorporationControl method for use with a steerable drilling system
US7168507Mar 21, 2003Jan 30, 2007Schlumberger Technology CorporationRecalibration of downhole sensors
US7188685Dec 13, 2002Mar 13, 2007Schlumberge Technology CorporationHybrid rotary steerable system
US7457734Oct 12, 2006Nov 25, 2008Reedhycalog Uk LimitedRepresentation of whirl in fixed cutter drill bits
US8550183Sep 29, 2009Oct 8, 2013National Oilwell Varco, L.P.Drilling method
USRE33751 *May 23, 1989Nov 26, 1991Smith International, Inc.System and method for controlled directional drilling
WO1992014905A2 *Feb 5, 1992Sep 3, 1992Bergwerksverband GmbhDevice for the precise directional control of capping bores
WO2014006466A2 *Feb 28, 2013Jan 9, 2014Nov Downhole Eurasia Ltd.Orientable downhole drilling assembly and method of using same
Classifications
U.S. Classification175/73
International ClassificationE21B7/04, E21B7/08, E21B7/06
Cooperative ClassificationE21B7/062
European ClassificationE21B7/06C