US2495439A - Side wall sample taker - Google Patents

Side wall sample taker Download PDF

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Publication number
US2495439A
US2495439A US609610A US60961045A US2495439A US 2495439 A US2495439 A US 2495439A US 609610 A US609610 A US 609610A US 60961045 A US60961045 A US 60961045A US 2495439 A US2495439 A US 2495439A
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core
side wall
bore
drill
tool
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US609610A
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Neville B Brimble
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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
    • E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
    • E21B49/02—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells by mechanically taking samples of the soil
    • E21B49/06—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells by mechanically taking samples of the soil using side-wall drilling tools pressing or scrapers

Definitions

  • This invention relates to a side wall sample taker.
  • An object of the invention is to provide equipn ment of the character described adapted to be lowered into a well and operable ⁇ to take a sample of the formation from the side wall of the bore and to withdraw the same to the ground surface for inspection.
  • Another object oi' the invention is to provide a tool of the character described which may be anchored ⁇ at any desired elevation in the well and which embodies a core barrel and a core forming drill with a deflector for directing the drill into the side wall of thel bore for drilling a, substantial core or sample which will be enk trapped in the core barrel for withdrawal to the ground surface.
  • the invention also embodies novel means for holding the deflector closely against .the side wall of the bore from which the sample is to be taken.
  • The'invention also embodies novel means for connecting the drill stem to the whpstock, or the deector, which will allow the core forming tool to be deflected at the required angle into the side wall of the bore.
  • the invention also embodies novel means for anchoring the deiiecting tool in the well bore.
  • Figure 1 is a side elevation of the tool as being lowered into the well and shown partly7 in section.
  • Figure 2 is an enlarged, fragmentary, vertical sectional view taken on the line 2-2 of Figure 1.
  • Figure 3 is a cross-'sectional view taken on the line 3-k-3 of.
  • Figure 4' is an enlarged vertical sectional .view taken on the line 4-4 of Figure 1.
  • Figure 5 is an enlarged, fragmentary, side view, partly in section of the anchoring device.
  • Figure 6 is a cross sectional view thereof taken on the line 6-6 of Figure 5.
  • Figure 7 is a side elevation of the tool, partly in section and in position in a well for taking a sample
  • Figure 8 is a cross-sectional view taken on the line 8-8 of Figure 7.
  • the numeral I designates a whipstock, or deflector, whose upper end has the f arcuate deiiecting face 2 which is concaved in cross-section.
  • the lower end of the defiector I is formed with a. deep mortise 3, as illustrated in dotted lines in Figure 1, and also as shown in Figure 8.
  • the numeral 4 designates an anchor block which has an elongated'tenon 5 which ts up into the. mortise 3 but is somewhat narrower in width than said mortise, as illustrated in dotted lines in Figure 1.
  • the tenori is pinned to the deflector I by means of a frangible pin B in position so that the lower end of the deflector will be spaced above the upper end of the anchor block 4.
  • These opposing ends are correspondingly pitched, oretapered, as shown in Figures 1 and '7.
  • the tenon 5 has a v ⁇ diagonal slot v1 cut there through which is pitched to substantially correspond to the pitch of the lower end of the deiiector with its forward end turned downwardly and its other end turned upwardly; and a pin 8 has its ends anchored to the sides of the deiiector and extends through the slot 1.
  • the lower endv of the spindle 9- is formed with the spaced cams I4 which are correspondingly pitched.
  • the collar I'I there is a spherical cavity 2
  • a tubular core-barrel 25 is locatedinthe drill stem section. i8. and is supported on the. upper end of the drill 20 and has the conventional core catcher 26 within its lower end and an outlet port controlled by the outwardly opening check. valve 2l' at its upper end.
  • Drilling uid may be forced down. througirthe drill stem and around the core barrel 25 and on through the ducts 28 in the drill-Z'so asto coli-l duct drilling Huid to the cutting points of the drill.
  • the tool may, be lowered into the Wellborei 2.9, to the desired' location with the wiper springs IB' in contact with the walls of tho bore and with the cross' pin 8 in the upwardly turned end of slot'T.
  • the tool may be turned but the wiper springs will hold the collar l2 and the legs l5 against rotating so that the cams M will ⁇ operate against the lower ends of saidlegs and forceA the-legsoutwardl'y into contact with the-walls of thev bore so'rth'at said legs will support the tool as shown in Figure 7.
  • chor having means ⁇ thereon engageable with the walls of a. well,bore tofsupport the' ⁇ anchor therein, a deector connected to the anchor and downwardly movable relative thereto, said deflector and anchor being provided one with a diagonal slot and the other with a cross pin movable in the slot and forming means for moving the deflector laterally relative to the anchor, and adjacent one side of the bore, upon such downward movement, a core forming tool containing a sample chamber and, ⁇ having auniversal connection with the deflector and arranged to be deiiected by said deflector into said side of the bore and means having a universal connection with the tool for rotating said tool to form a core froml said side wall.
  • A. device for taking samples from the side wall of a well bore comprising, an anchoring device engageable with the Wall of the well bore, adeiiector mounted on the anchoring device having a diagonal slot and movable downwardly and laterally relative to ⁇ the anchoring device, a crossk pin on the anchoring device which-works in said slot to cause such lateral movement, a coring tool having a universal sliding ⁇ connection with the deector and arranged to be deii'ected therebyinto the sidewall of the bore, means having a universal connection with'the-coring tool for rotating'the coring tool' to form a core of the wall formation and a sampleireceiver in the dvice for receiving and retainingthe'A core.
  • a sample taking device comprising, an ancher having means thereon engageable with the walls cfa weiibore to support the anchor there'- in, a deflector connected to the anchor and downwardly movable relative thereto, the connected parts of the deector and anchor being provided one-with a diagonal guideway and the other with a projection which extendsV into the guideway thusforming means'for movingthe deflector laterally relative. toV the anchor' and adjacent one' side. of.' the. bore, upon: suchv downward movement, a core forming tool containing a sam'- ple chamber: and having-a universal connection withY the'v deector and. arranged to.. bef deie'cted by the deilector, inte the: sideiwallz of: the. bore and means forrotatinglfsaidtooltofform a core of the wall formation.

Description

Jan. 24, 1950 N. B. BRIMBLE SIDEWALL SAMPLE TAKER 2 Shets-Sheet l Filed Aug. 8, 1945 Jan. 24, 1950 N, B, BRlMBLE 2,495,439
SIDEWALL SAMPLE TAKER v Filed Aug. 8, 1945 2 Sheets-Sheet 2 l 5 3 I l 4 'FST 192 20 y y 2 l] l i r IH le E l I I4 j I4 FIG. 7
INVENTQR.
M/MM
Patented Jan. 24, 1950 UNITED y STATES PATENT OFFICE 2,495,439 y SIDE WALL SAMPLE TAKER ANeville B. Brmble, Houston, Tex. Application August s, 1945, serial No. 609,610 s claims.v (o1. c55-1.4)
This invention relates to a side wall sample taker.
An object of the inventionis to provide equipn ment of the character described adapted to be lowered into a well and operable` to take a sample of the formation from the side wall of the bore and to withdraw the same to the ground surface for inspection. Y K
Another object oi' the invention is to provide a tool of the character described which may be anchored` at any desired elevation in the well and which embodies a core barrel and a core forming drill with a deflector for directing the drill into the side wall of thel bore for drilling a, substantial core or sample which will be enk trapped in the core barrel for withdrawal to the ground surface.
The invention also embodies novel means for holding the deflector closely against .the side wall of the bore from which the sample is to be taken.
The'invention also embodies novel means for connecting the drill stem to the whpstock, or the deector, which will allow the core forming tool to be deflected at the required angle into the side wall of the bore.
The inventionalso embodies novel means for anchoring the deiiecting tool in the well bore.
Other advantages will be apparent from the following description which is illustrated in the accompanying drawings, wherein:
Figure 1 is a side elevation of the tool as being lowered into the well and shown partly7 in section.
Figure 2 is an enlarged, fragmentary, vertical sectional view taken on the line 2-2 of Figure 1.
Figure 3 is a cross-'sectional view taken on the line 3-k-3 of. Figure 1. .i
Figure 4' is an enlarged vertical sectional .view taken on the line 4-4 of Figure 1.
Figure 5 is an enlarged, fragmentary, side view, partly in section of the anchoring device.
Figure 6 is a cross sectional view thereof taken on the line 6-6 of Figure 5. Y
Figure 7 is a side elevation of the tool, partly in section and in position in a well for taking a sample, and
Figure 8 is a cross-sectional view taken on the line 8-8 of Figure 7.
In the drawings the numeral I designates a whipstock, or deflector, whose upper end has the f arcuate deiiecting face 2 which is concaved in cross-section. v
The lower end of the defiector I is formed with a. deep mortise 3, as illustrated in dotted lines in Figure 1, and also as shown in Figure 8.
y. The numeral 4 designates an anchor block which has an elongated'tenon 5 which ts up into the. mortise 3 but is somewhat narrower in width than said mortise, as illustrated in dotted lines in Figure 1. The tenori is pinned to the deflector I by means ofa frangible pin B in position so that the lower end of the deflector will be spaced above the upper end of the anchor block 4. These opposing ends are correspondingly pitched, oretapered, as shown in Figures 1 and '7. i
The tenon 5 has a v`diagonal slot v1 cut there through which is pitched to substantially correspond to the pitch of the lower end of the deiiector with its forward end turned downwardly and its other end turned upwardly; and a pin 8 has its ends anchored to the sides of the deiiector and extends through the slot 1.
Screwed intoV the lower end of the anchor block 4 there is a spindle 9 which is securely held therein against unscrewing by the set screw I0 kwhich is screwed into said block and whose inner end projects into the spindle.
lBeneath the anchor block 4 the Aspindle is thickened in diameter forming an external, annular shoulder I I and surrounding the upper end of the spindle and supported on the shoulder II .there is-a collar I2 which has the pairs of radial spaced lugs as I3, I3. l
The lower endv of the spindle 9- is formed with the spaced cams I4 which are correspondingly pitched.
There vare the llegs I 5 whose upper ends are pivotedbetween the respective pairs of lugs I3 and whose lower ends are free and are held in contact with the cams I4 by the outwardly bowed wiper springs I6. The outer margins of the legs I5 are formed with ratchet teeth so as to readily engage the sidewalls of the bore when the legs are spread by the cams I4.
Fastened to the upper end of the defiector, or whipstockfl and on thetapering face thereof there is a collar I1 through which the lower section I8 of the drill stem extends said section of the drill stem being pinned to the collar I1 by a frangible pin I9.
Beneath the collar I1 and screwed onto the lower end of the drill stem there is a core forming drill 20.
Within the collar I'I there is a spherical cavity 2| and within this cavity there is a ring 22 through which thedrill stem I8 extends and this ring has external antifriction bearings 23 which ride against the wall of the cavity 2I and the passageway through the collar I1 for the drill stem section I8 is larger, in diameter, than the external diameter of said drill stem section so as to give the drill stem section i8 the required range of movement to allow the core drill to follow the angular course of the deflecting face 2 and, for this purpose, the section I8 of the drill stem is connected to the adjacent section above by means of the universal coupling 24.
A tubular core-barrel 25 is locatedinthe drill stem section. i8. and is supported on the. upper end of the drill 20 and has the conventional core catcher 26 within its lower end and an outlet port controlled by the outwardly opening check. valve 2l' at its upper end.
Drilling uid may be forced down. througirthe drill stem and around the core barrel 25 and on through the ducts 28 in the drill-Z'so asto coli-l duct drilling Huid to the cutting points of the drill.
Inoperation the tool may, be lowered into the Wellborei 2.9, to the desired' location with the wiper springs IB' in contact with the walls of tho bore and with the cross' pin 8 in the upwardly turned end of slot'T. When the desired location has been reached the tool may be turned but the wiper springs will hold the collar l2 and the legs l5 against rotating so that the cams M will` operate against the lower ends of saidlegs and forceA the-legsoutwardl'y into contact with the-walls of thev bore so'rth'at said legs will support the tool as shown in Figure 7. Additional weight from above will" then be applied and the pin 6 will bes'heared and the deiiector will move on downwardly relative to the anchor block t but the cross-pin#y 8 moving onv theY diagonal slot Twill cause the-de'ectorto'move forwardly into the position-'indicated inY Figures 7 and 8 and in contact with-the Walls ofi the bores andr with the ta lering lower` end ofthe defl'ectorv resting upon the' tapering' upper'V end. of the anchor block; 4. The' pin 8:' will th'en befseatediny the downwardly turned end of? slot 7 to* maintain the' parts in said positioni. Addtionalweightfrom above` may he their. applied and; the pin:A 1:9 will be; shared and the core drill..will then". beslowered; andas lowered: will beY deflected by the face 2 into the sidewall of thebore:
As lowered the drillv should; of course; be. rotated and it will drill outinto the.- sidewall oflthe bor-.e and` Will form; aA core. which: will pass by thefcorecatcher 29.- into the. core. barrelll'r. and will be retained therein. The contents of: the core barrelaheadofthe entering coremay escape past the-valvef. Whenv a suicient. sample'has thus been; obtained theentiretocLmay bewithdrawnfromtheboreto thagrouud surface. and broken up for.' access-to, and inspection.. of;v` the sample..
Whats- I'cIaim is:
l. A sample taking devicefcomprising, an. an.-
chor having means` thereon engageable with the walls of a. well,bore tofsupport the'` anchor therein, a deector connected to the anchor and downwardly movable relative thereto, said deflector and anchor being provided one with a diagonal slot and the other with a cross pin movable in the slot and forming means for moving the deflector laterally relative to the anchor, and adjacent one side of the bore, upon such downward movement, a core forming tool containing a sample chamber and,` having auniversal connection with the deflector and arranged to be deiiected by said deflector into said side of the bore and means having a universal connection with the tool for rotating said tool to form a core froml said side wall.
2. A. device: for taking samples from the side wall of a well bore comprising, an anchoring device engageable with the Wall of the well bore, adeiiector mounted on the anchoring device having a diagonal slot and movable downwardly and laterally relative to` the anchoring device, a crossk pin on the anchoring device which-works in said slot to cause such lateral movement, a coring tool having a universal sliding` connection with the deector and arranged to be deii'ected therebyinto the sidewall of the bore, means having a universal connection with'the-coring tool for rotating'the coring tool' to form a core of the wall formation and a sampleireceiver in the dvice for receiving and retainingthe'A core.
3. A sample taking device comprising, an ancher having means thereon engageable with the walls cfa weiibore to support the anchor there'- in, a deflector connected to the anchor and downwardly movable relative thereto, the connected parts of the deector and anchor being provided one-with a diagonal guideway and the other with a projection which extendsV into the guideway thusforming means'for movingthe deflector laterally relative. toV the anchor' and adjacent one' side. of.' the. bore, upon: suchv downward movement, a core forming tool containing a sam'- ple chamber: and having-a universal connection withY the'v deector and. arranged to.. bef deie'cted by the deilector, inte the: sideiwallz of: the. bore and means forrotatinglfsaidtooltofform a core of the wall formation.
. NEVILLE B. B'RIMBLET REFERENCES CITED Thefollowing'references are of' record in' the i'lle of this patent.'
Number Name DateA 1,627,842' Edwards May 1'0, 1'927 2,147,491 Le Bus" Feb; 14, 1939 2,170,284 Eastman Aug. 22, 1939 2,324,682 DeV Long July 20j 1943 2,386,514 StokesA Oct; 9, 1945 2,401,893 Williams, J'r l June'll, 1946
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Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2716540A (en) * 1952-03-31 1955-08-30 Oilwell Drain Hole Drilling Co Bottom anchored drain hole drilling equipment
US3290236A (en) * 1963-02-07 1966-12-06 Electromark Corp Electrolytic marking apparatus including stencil holder
US4640353A (en) * 1986-03-21 1987-02-03 Atlantic Richfield Company Electrode well and method of completion
US5361833A (en) * 1993-11-18 1994-11-08 Triumph*Lor, Inc. Bottom set, non-retrievable whipstock assembly
US5409060A (en) * 1993-09-10 1995-04-25 Weatherford U.S., Inc. Wellbore tool orientation
US5425417A (en) * 1993-09-10 1995-06-20 Weatherford U.S., Inc. Wellbore tool setting system
US5535822A (en) * 1994-09-08 1996-07-16 Enterra Corporation Apparatus for retrieving whipstock
US5727629A (en) * 1996-01-24 1998-03-17 Weatherford/Lamb, Inc. Wellbore milling guide and method
US5730221A (en) * 1996-07-15 1998-03-24 Halliburton Energy Services, Inc Methods of completing a subterranean well
US5803176A (en) * 1996-01-24 1998-09-08 Weatherford/Lamb, Inc. Sidetracking operations
US5813465A (en) * 1996-07-15 1998-09-29 Halliburton Energy Services, Inc. Apparatus for completing a subterranean well and associated methods of using same
US5826651A (en) * 1993-09-10 1998-10-27 Weatherford/Lamb, Inc. Wellbore single trip milling
US5833003A (en) * 1996-07-15 1998-11-10 Halliburton Energy Services, Inc. Apparatus for completing a subterranean well and associated methods of using same
US5836387A (en) * 1993-09-10 1998-11-17 Weatherford/Lamb, Inc. System for securing an item in a tubular channel in a wellbore
US5862862A (en) * 1996-07-15 1999-01-26 Halliburton Energy Services, Inc. Apparatus for completing a subterranean well and associated methods of using same
US6059037A (en) * 1996-07-15 2000-05-09 Halliburton Energy Services, Inc. Apparatus for completing a subterranean well and associated methods of using same
US6076602A (en) * 1996-07-15 2000-06-20 Halliburton Energy Services, Inc. Apparatus for completing a subterranean well and associated methods of using same
US6092601A (en) * 1996-07-15 2000-07-25 Halliburton Energy Services, Inc. Apparatus for completing a subterranean well and associated methods of using same
US6112812A (en) * 1994-03-18 2000-09-05 Weatherford/Lamb, Inc. Wellbore milling method
US6116344A (en) * 1996-07-15 2000-09-12 Halliburton Energy Services, Inc. Apparatus for completing a subterranean well and associated methods of using same
US6135206A (en) * 1996-07-15 2000-10-24 Halliburton Energy Services, Inc. Apparatus for completing a subterranean well and associated methods of using same
US20060219440A1 (en) * 2005-04-05 2006-10-05 Technology Ventures International, Ltd. Slip grip drilling tool
US20100307837A1 (en) * 2009-06-05 2010-12-09 Varel International, Ind., L.P. Casing bit and casing reamer designs
US20100319996A1 (en) * 2009-05-29 2010-12-23 Varel International, Ind., L.P. Milling cap for a polycrystalline diamond compact cutter
US20100319997A1 (en) * 2009-05-29 2010-12-23 Varel International, Ind., L.P. Whipstock attachment to a fixed cutter drilling or milling bit
US20110209922A1 (en) * 2009-06-05 2011-09-01 Varel International Casing end tool
US8657036B2 (en) 2009-01-15 2014-02-25 Downhole Products Limited Tubing shoe

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1627842A (en) * 1921-11-18 1927-05-10 Charles R Edwards Device for unscrewing and withdrawing pipe
US2147491A (en) * 1936-12-04 1939-02-14 Bus George F Le Side tracker for oil well equipment
US2170284A (en) * 1937-10-28 1939-08-22 Eastman Harlan John Whip-stock bottom
US2324682A (en) * 1941-03-26 1943-07-20 Fohs Oil Company Side wall coring tool
US2386514A (en) * 1942-06-11 1945-10-09 Reed Roller Bit Co Side hole coring device
US2401893A (en) * 1943-05-06 1946-06-11 Jr Edward B Williams Side wall core barrel

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1627842A (en) * 1921-11-18 1927-05-10 Charles R Edwards Device for unscrewing and withdrawing pipe
US2147491A (en) * 1936-12-04 1939-02-14 Bus George F Le Side tracker for oil well equipment
US2170284A (en) * 1937-10-28 1939-08-22 Eastman Harlan John Whip-stock bottom
US2324682A (en) * 1941-03-26 1943-07-20 Fohs Oil Company Side wall coring tool
US2386514A (en) * 1942-06-11 1945-10-09 Reed Roller Bit Co Side hole coring device
US2401893A (en) * 1943-05-06 1946-06-11 Jr Edward B Williams Side wall core barrel

Cited By (36)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2716540A (en) * 1952-03-31 1955-08-30 Oilwell Drain Hole Drilling Co Bottom anchored drain hole drilling equipment
US3290236A (en) * 1963-02-07 1966-12-06 Electromark Corp Electrolytic marking apparatus including stencil holder
US4640353A (en) * 1986-03-21 1987-02-03 Atlantic Richfield Company Electrode well and method of completion
US5409060A (en) * 1993-09-10 1995-04-25 Weatherford U.S., Inc. Wellbore tool orientation
US5425417A (en) * 1993-09-10 1995-06-20 Weatherford U.S., Inc. Wellbore tool setting system
US5452759A (en) * 1993-09-10 1995-09-26 Weatherford U.S., Inc. Whipstock system
US5836387A (en) * 1993-09-10 1998-11-17 Weatherford/Lamb, Inc. System for securing an item in a tubular channel in a wellbore
US6035939A (en) * 1993-09-10 2000-03-14 Weatherford/Lamb, Inc. Wellbore anchor system
US5826651A (en) * 1993-09-10 1998-10-27 Weatherford/Lamb, Inc. Wellbore single trip milling
US5361833A (en) * 1993-11-18 1994-11-08 Triumph*Lor, Inc. Bottom set, non-retrievable whipstock assembly
US6112812A (en) * 1994-03-18 2000-09-05 Weatherford/Lamb, Inc. Wellbore milling method
US5535822A (en) * 1994-09-08 1996-07-16 Enterra Corporation Apparatus for retrieving whipstock
US5727629A (en) * 1996-01-24 1998-03-17 Weatherford/Lamb, Inc. Wellbore milling guide and method
US5806600A (en) * 1996-01-24 1998-09-15 Halford, Sr.; Hubert E. Whipstock system
US5803176A (en) * 1996-01-24 1998-09-08 Weatherford/Lamb, Inc. Sidetracking operations
US5769166A (en) * 1996-01-24 1998-06-23 Weatherford/Lamb, Inc. Wellbore window milling method
US5730221A (en) * 1996-07-15 1998-03-24 Halliburton Energy Services, Inc Methods of completing a subterranean well
US5862862A (en) * 1996-07-15 1999-01-26 Halliburton Energy Services, Inc. Apparatus for completing a subterranean well and associated methods of using same
US5833003A (en) * 1996-07-15 1998-11-10 Halliburton Energy Services, Inc. Apparatus for completing a subterranean well and associated methods of using same
US6059037A (en) * 1996-07-15 2000-05-09 Halliburton Energy Services, Inc. Apparatus for completing a subterranean well and associated methods of using same
US6076602A (en) * 1996-07-15 2000-06-20 Halliburton Energy Services, Inc. Apparatus for completing a subterranean well and associated methods of using same
US6092601A (en) * 1996-07-15 2000-07-25 Halliburton Energy Services, Inc. Apparatus for completing a subterranean well and associated methods of using same
US5813465A (en) * 1996-07-15 1998-09-29 Halliburton Energy Services, Inc. Apparatus for completing a subterranean well and associated methods of using same
US6116344A (en) * 1996-07-15 2000-09-12 Halliburton Energy Services, Inc. Apparatus for completing a subterranean well and associated methods of using same
US6135206A (en) * 1996-07-15 2000-10-24 Halliburton Energy Services, Inc. Apparatus for completing a subterranean well and associated methods of using same
US20060219440A1 (en) * 2005-04-05 2006-10-05 Technology Ventures International, Ltd. Slip grip drilling tool
US7484573B2 (en) * 2005-04-05 2009-02-03 Technology Ventures Ltd. Slip grip drilling tool
GB2424909B (en) * 2005-04-05 2010-05-26 Technology Ventures Internat L Directional drilling
US8657036B2 (en) 2009-01-15 2014-02-25 Downhole Products Limited Tubing shoe
US20100319996A1 (en) * 2009-05-29 2010-12-23 Varel International, Ind., L.P. Milling cap for a polycrystalline diamond compact cutter
US20100319997A1 (en) * 2009-05-29 2010-12-23 Varel International, Ind., L.P. Whipstock attachment to a fixed cutter drilling or milling bit
US8327944B2 (en) * 2009-05-29 2012-12-11 Varel International, Ind., L.P. Whipstock attachment to a fixed cutter drilling or milling bit
US8517123B2 (en) 2009-05-29 2013-08-27 Varel International, Ind., L.P. Milling cap for a polycrystalline diamond compact cutter
US20100307837A1 (en) * 2009-06-05 2010-12-09 Varel International, Ind., L.P. Casing bit and casing reamer designs
US20110209922A1 (en) * 2009-06-05 2011-09-01 Varel International Casing end tool
US8561729B2 (en) 2009-06-05 2013-10-22 Varel International, Ind., L.P. Casing bit and casing reamer designs

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