GB838833A - Expansible rotary drill bit - Google Patents
Expansible rotary drill bitInfo
- Publication number
- GB838833A GB838833A GB27201/58A GB2720158A GB838833A GB 838833 A GB838833 A GB 838833A GB 27201/58 A GB27201/58 A GB 27201/58A GB 2720158 A GB2720158 A GB 2720158A GB 838833 A GB838833 A GB 838833A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cutters
- drill bit
- rotary drill
- well
- cutter
- 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
Links
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- 239000012530 fluid Substances 0.000 abstract 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/26—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers
- E21B10/32—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers with expansible cutting tools
- E21B10/34—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers with expansible cutting tools of roller-cutter type
- E21B10/345—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers with expansible cutting tools of roller-cutter type cutter shifted by fluid pressure
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
838,833. Well boring. KAMMERER, A. W. Aug. 25, 1958, No. 27201/58. Class 85 In a rotary drill bit of the expansible type, for enlarging the well bore below a well casing, the cutters are of unequal cutting lengths so that, although they can be collapsed within the confines of the well casing, when they are expanded the enlarged bore produced is of greater diameter than would be the case if cutters of equal length were used. The invention is shown as applied to the drill bit described in Specification 766,242, two cutters 61 and one cutter 61a being journalled on pins 60 projecting from the cam-actuated arms 36, 36a. When the arms are fully expanded by fluid pressure as in Specification 766,242, the cutters 61 leave an inner ridge H, on the formation shoulder C, which is immediately removed by the longer cutter 61a.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB27201/58A GB838833A (en) | 1958-08-25 | 1958-08-25 | Expansible rotary drill bit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB27201/58A GB838833A (en) | 1958-08-25 | 1958-08-25 | Expansible rotary drill bit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB838833A true GB838833A (en) | 1960-06-22 |
Family
ID=10255824
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB27201/58A Expired GB838833A (en) | 1958-08-25 | 1958-08-25 | Expansible rotary drill bit |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB838833A (en) |
Cited By (55)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3483934A (en) * | 1968-05-06 | 1969-12-16 | Benjamin H Fuchs | Underreamer having unequal arm extension radii |
| GB2128657A (en) * | 1982-10-22 | 1984-05-02 | Coal Ind | Drilling methods and equipment |
| GB2194571A (en) * | 1986-08-13 | 1988-03-09 | A Z Int Tool Co | Drilling apparatus and cutter |
| EP0265344A1 (en) * | 1986-10-22 | 1988-04-27 | SOLETANCHE Société Anonyme dite: | Method for producting a pile in the ground, drilling machine and device for carrying out such a method |
| WO2002001037A1 (en) * | 2000-06-28 | 2002-01-03 | Weatherford/Lamb, Inc. | Drill bits |
| US6857487B2 (en) | 2002-12-30 | 2005-02-22 | Weatherford/Lamb, Inc. | Drilling with concentric strings of casing |
| US6896075B2 (en) | 2002-10-11 | 2005-05-24 | Weatherford/Lamb, Inc. | Apparatus and methods for drilling with casing |
| US6899186B2 (en) | 2002-12-13 | 2005-05-31 | Weatherford/Lamb, Inc. | Apparatus and method of drilling with casing |
| US6953096B2 (en) | 2002-12-31 | 2005-10-11 | Weatherford/Lamb, Inc. | Expandable bit with secondary release device |
| US6994176B2 (en) | 2002-07-29 | 2006-02-07 | Weatherford/Lamb, Inc. | Adjustable rotating guides for spider or elevator |
| US7004264B2 (en) | 2002-03-16 | 2006-02-28 | Weatherford/Lamb, Inc. | Bore lining and drilling |
| 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 |
| US7036610B1 (en) | 1994-10-14 | 2006-05-02 | Weatherford / Lamb, Inc. | Apparatus and method for completing oil and gas wells |
| US7040420B2 (en) | 1994-10-14 | 2006-05-09 | Weatherford/Lamb, Inc. | Methods and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells |
| US7048050B2 (en) | 1994-10-14 | 2006-05-23 | Weatherford/Lamb, Inc. | Method and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells |
| US7073598B2 (en) | 2001-05-17 | 2006-07-11 | Weatherford/Lamb, Inc. | Apparatus and methods for tubular makeup interlock |
| US7090021B2 (en) | 1998-08-24 | 2006-08-15 | Bernd-Georg Pietras | Apparatus for connecting tublars using a top drive |
| US7093675B2 (en) | 2000-08-01 | 2006-08-22 | Weatherford/Lamb, Inc. | Drilling method |
| US7096982B2 (en) | 2003-02-27 | 2006-08-29 | Weatherford/Lamb, Inc. | Drill shoe |
| US7100713B2 (en) | 2000-04-28 | 2006-09-05 | Weatherford/Lamb, Inc. | Expandable apparatus for drift and reaming borehole |
| US7100710B2 (en) | 1994-10-14 | 2006-09-05 | Weatherford/Lamb, Inc. | Methods and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells |
| US7108084B2 (en) | 1994-10-14 | 2006-09-19 | Weatherford/Lamb, Inc. | Methods and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells |
| US7117957B2 (en) | 1998-12-22 | 2006-10-10 | Weatherford/Lamb, Inc. | Methods for drilling and lining a wellbore |
| US7128161B2 (en) | 1998-12-24 | 2006-10-31 | Weatherford/Lamb, Inc. | Apparatus and methods for facilitating the connection of tubulars using a top drive |
| US7128154B2 (en) | 2003-01-30 | 2006-10-31 | Weatherford/Lamb, Inc. | Single-direction cementing plug |
| US7137454B2 (en) | 1998-07-22 | 2006-11-21 | Weatherford/Lamb, Inc. | Apparatus for facilitating the connection of tubulars using a top drive |
| US7140445B2 (en) | 1997-09-02 | 2006-11-28 | Weatherford/Lamb, Inc. | Method and apparatus for drilling with casing |
| US7143847B2 (en) | 2000-08-11 | 2006-12-05 | Weatherford/Lamb, Inc. | Drilling apparatus |
| US7147068B2 (en) | 1994-10-14 | 2006-12-12 | Weatherford / Lamb, Inc. | Methods and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells |
| US7188687B2 (en) | 1998-12-22 | 2007-03-13 | Weatherford/Lamb, Inc. | Downhole filter |
| US7191840B2 (en) | 2003-03-05 | 2007-03-20 | Weatherford/Lamb, Inc. | Casing running and drilling system |
| US7213656B2 (en) | 1998-12-24 | 2007-05-08 | Weatherford/Lamb, Inc. | Apparatus and method for facilitating the connection of tubulars using a top drive |
| US7216727B2 (en) | 1999-12-22 | 2007-05-15 | Weatherford/Lamb, Inc. | Drilling bit for drilling while running casing |
| US7219744B2 (en) | 1998-08-24 | 2007-05-22 | Weatherford/Lamb, Inc. | Method and apparatus for connecting tubulars using a top drive |
| US7228901B2 (en) | 1994-10-14 | 2007-06-12 | Weatherford/Lamb, Inc. | Method and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells |
| US7264067B2 (en) | 2003-10-03 | 2007-09-04 | Weatherford/Lamb, Inc. | Method of drilling and completing multiple wellbores inside a single caisson |
| US7284617B2 (en) | 2004-05-20 | 2007-10-23 | Weatherford/Lamb, Inc. | Casing running head |
| US7303022B2 (en) | 2002-10-11 | 2007-12-04 | Weatherford/Lamb, Inc. | Wired casing |
| US7311148B2 (en) | 1999-02-25 | 2007-12-25 | Weatherford/Lamb, Inc. | Methods and apparatus for wellbore construction and completion |
| US7325610B2 (en) | 2000-04-17 | 2008-02-05 | Weatherford/Lamb, Inc. | Methods and apparatus for handling and drilling with tubulars or casing |
| US7334650B2 (en) | 2000-04-13 | 2008-02-26 | Weatherford/Lamb, Inc. | Apparatus and methods for drilling a wellbore using casing |
| US7360594B2 (en) | 2003-03-05 | 2008-04-22 | Weatherford/Lamb, Inc. | Drilling with casing latch |
| US7370707B2 (en) | 2003-04-04 | 2008-05-13 | Weatherford/Lamb, Inc. | Method and apparatus for handling wellbore tubulars |
| US7413020B2 (en) | 2003-03-05 | 2008-08-19 | Weatherford/Lamb, Inc. | Full bore lined wellbores |
| US7503397B2 (en) | 2004-07-30 | 2009-03-17 | Weatherford/Lamb, Inc. | Apparatus and methods of setting and retrieving casing with drilling latch and bottom hole assembly |
| US7509722B2 (en) | 1997-09-02 | 2009-03-31 | Weatherford/Lamb, Inc. | Positioning and spinning device |
| US7617866B2 (en) | 1998-08-24 | 2009-11-17 | Weatherford/Lamb, Inc. | Methods and apparatus for connecting tubulars using a top drive |
| US7650944B1 (en) | 2003-07-11 | 2010-01-26 | Weatherford/Lamb, Inc. | Vessel for well intervention |
| US7712523B2 (en) | 2000-04-17 | 2010-05-11 | Weatherford/Lamb, Inc. | Top drive casing system |
| US7730965B2 (en) | 2002-12-13 | 2010-06-08 | Weatherford/Lamb, Inc. | Retractable joint and cementing shoe for use in completing a wellbore |
| US7857052B2 (en) | 2006-05-12 | 2010-12-28 | Weatherford/Lamb, Inc. | Stage cementing methods used in casing while drilling |
| US7938201B2 (en) | 2002-12-13 | 2011-05-10 | Weatherford/Lamb, Inc. | Deep water drilling with casing |
| USRE42877E1 (en) | 2003-02-07 | 2011-11-01 | Weatherford/Lamb, Inc. | Methods and apparatus for wellbore construction and completion |
| US8276689B2 (en) | 2006-05-22 | 2012-10-02 | Weatherford/Lamb, Inc. | Methods and apparatus for drilling with casing |
| CN110424897A (en) * | 2019-08-27 | 2019-11-08 | 中铁第四勘察设计院集团有限公司 | Bottom expanding drill afterwards |
-
1958
- 1958-08-25 GB GB27201/58A patent/GB838833A/en not_active Expired
Cited By (74)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3483934A (en) * | 1968-05-06 | 1969-12-16 | Benjamin H Fuchs | Underreamer having unequal arm extension radii |
| GB2128657A (en) * | 1982-10-22 | 1984-05-02 | Coal Ind | Drilling methods and equipment |
| GB2194571A (en) * | 1986-08-13 | 1988-03-09 | A Z Int Tool Co | Drilling apparatus and cutter |
| GB2194571B (en) * | 1986-08-13 | 1990-05-16 | A Z Int Tool Co | Drilling apparatus and cutter |
| EP0265344A1 (en) * | 1986-10-22 | 1988-04-27 | SOLETANCHE Société Anonyme dite: | Method for producting a pile in the ground, drilling machine and device for carrying out such a method |
| FR2605657A1 (en) * | 1986-10-22 | 1988-04-29 | Soletanche | METHOD FOR PRODUCING A PIEU IN SOIL, DRILLING MACHINE AND DEVICE FOR IMPLEMENTING SAID METHOD |
| US4904119A (en) * | 1986-10-22 | 1990-02-27 | Soletanche | Process for placing a piling in the ground, a drilling machine and an arrangement for implementing this process |
| US7165634B2 (en) | 1994-10-14 | 2007-01-23 | Weatherford/Lamb, Inc. | Method and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells |
| US7036610B1 (en) | 1994-10-14 | 2006-05-02 | Weatherford / Lamb, Inc. | Apparatus and method for completing oil and gas wells |
| US7147068B2 (en) | 1994-10-14 | 2006-12-12 | Weatherford / Lamb, Inc. | Methods and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells |
| US7048050B2 (en) | 1994-10-14 | 2006-05-23 | Weatherford/Lamb, Inc. | Method and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells |
| US7040420B2 (en) | 1994-10-14 | 2006-05-09 | Weatherford/Lamb, Inc. | Methods and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells |
| US7100710B2 (en) | 1994-10-14 | 2006-09-05 | Weatherford/Lamb, Inc. | Methods and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells |
| US7228901B2 (en) | 1994-10-14 | 2007-06-12 | Weatherford/Lamb, Inc. | Method and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells |
| 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 |
| US7108084B2 (en) | 1994-10-14 | 2006-09-19 | 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 |
| US7140445B2 (en) | 1997-09-02 | 2006-11-28 | Weatherford/Lamb, Inc. | Method and apparatus for drilling with casing |
| US7509722B2 (en) | 1997-09-02 | 2009-03-31 | Weatherford/Lamb, Inc. | Positioning and spinning device |
| US7137454B2 (en) | 1998-07-22 | 2006-11-21 | Weatherford/Lamb, Inc. | Apparatus for facilitating the connection of tubulars using a top drive |
| US7219744B2 (en) | 1998-08-24 | 2007-05-22 | Weatherford/Lamb, Inc. | Method and apparatus for connecting tubulars using a top drive |
| US7617866B2 (en) | 1998-08-24 | 2009-11-17 | Weatherford/Lamb, Inc. | Methods and apparatus for connecting tubulars using a top drive |
| US7090021B2 (en) | 1998-08-24 | 2006-08-15 | Bernd-Georg Pietras | Apparatus for connecting tublars using a top drive |
| US7117957B2 (en) | 1998-12-22 | 2006-10-10 | Weatherford/Lamb, Inc. | Methods for drilling and lining a wellbore |
| US7188687B2 (en) | 1998-12-22 | 2007-03-13 | Weatherford/Lamb, Inc. | Downhole filter |
| US7213656B2 (en) | 1998-12-24 | 2007-05-08 | Weatherford/Lamb, Inc. | Apparatus and method for facilitating the connection of tubulars using a top drive |
| US7128161B2 (en) | 1998-12-24 | 2006-10-31 | Weatherford/Lamb, Inc. | Apparatus and methods for facilitating the connection of tubulars using a top drive |
| US8403078B2 (en) | 1999-02-25 | 2013-03-26 | Weatherford/Lamb, Inc. | Methods and apparatus for wellbore construction and completion |
| US7311148B2 (en) | 1999-02-25 | 2007-12-25 | Weatherford/Lamb, Inc. | Methods and apparatus for wellbore construction and completion |
| US9637977B2 (en) | 1999-02-25 | 2017-05-02 | Weatherford Technology Holdings, Llc | Methods and apparatus for wellbore construction and completion |
| US7216727B2 (en) | 1999-12-22 | 2007-05-15 | Weatherford/Lamb, Inc. | Drilling bit for drilling while running casing |
| US7334650B2 (en) | 2000-04-13 | 2008-02-26 | Weatherford/Lamb, Inc. | Apparatus and methods for drilling a wellbore using casing |
| US8042616B2 (en) | 2000-04-13 | 2011-10-25 | Weatherford/Lamb, Inc. | Apparatus and methods for drilling a wellbore using casing |
| US8127868B2 (en) | 2000-04-13 | 2012-03-06 | Weatherford/Lamb, Inc. | Apparatus and methods for drilling a wellbore using casing |
| US7823660B2 (en) | 2000-04-13 | 2010-11-02 | Weatherford/Lamb, Inc. | Apparatus and methods for drilling a wellbore using casing |
| US8534379B2 (en) | 2000-04-13 | 2013-09-17 | Weatherford/Lamb, Inc. | Apparatus and methods for drilling a wellbore using casing |
| US7712523B2 (en) | 2000-04-17 | 2010-05-11 | Weatherford/Lamb, Inc. | Top drive casing system |
| US7325610B2 (en) | 2000-04-17 | 2008-02-05 | Weatherford/Lamb, Inc. | Methods and apparatus for handling and drilling with tubulars or casing |
| US7100713B2 (en) | 2000-04-28 | 2006-09-05 | Weatherford/Lamb, Inc. | Expandable apparatus for drift and reaming borehole |
| GB2364079A (en) * | 2000-06-28 | 2002-01-16 | Renovus Ltd | Expandable roller drill bit |
| WO2002001037A1 (en) * | 2000-06-28 | 2002-01-03 | Weatherford/Lamb, Inc. | Drill bits |
| GB2364079B (en) * | 2000-06-28 | 2004-11-17 | Renovus Ltd | Drill bits |
| US7195085B2 (en) | 2000-06-28 | 2007-03-27 | Weatherford/Lamb, Inc. | Drill bit |
| US7093675B2 (en) | 2000-08-01 | 2006-08-22 | Weatherford/Lamb, Inc. | Drilling method |
| US7143847B2 (en) | 2000-08-11 | 2006-12-05 | Weatherford/Lamb, Inc. | Drilling apparatus |
| US7681667B2 (en) | 2000-08-11 | 2010-03-23 | Weatherford/Lamb, Inc. | Drilling apparatus |
| US7073598B2 (en) | 2001-05-17 | 2006-07-11 | Weatherford/Lamb, Inc. | Apparatus and methods for tubular makeup interlock |
| US7004264B2 (en) | 2002-03-16 | 2006-02-28 | Weatherford/Lamb, Inc. | Bore lining and drilling |
| US6994176B2 (en) | 2002-07-29 | 2006-02-07 | 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 |
| US7303022B2 (en) | 2002-10-11 | 2007-12-04 | Weatherford/Lamb, Inc. | Wired casing |
| US7090023B2 (en) | 2002-10-11 | 2006-08-15 | Weatherford/Lamb, Inc. | Apparatus and methods for drilling with casing |
| US7083005B2 (en) | 2002-12-13 | 2006-08-01 | 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 |
| US6899186B2 (en) | 2002-12-13 | 2005-05-31 | Weatherford/Lamb, Inc. | Apparatus and method of drilling with casing |
| US7938201B2 (en) | 2002-12-13 | 2011-05-10 | Weatherford/Lamb, Inc. | Deep water drilling with casing |
| US7131505B2 (en) | 2002-12-30 | 2006-11-07 | Weatherford/Lamb, Inc. | Drilling with concentric strings of casing |
| US6857487B2 (en) | 2002-12-30 | 2005-02-22 | Weatherford/Lamb, Inc. | Drilling with concentric strings of casing |
| US6953096B2 (en) | 2002-12-31 | 2005-10-11 | Weatherford/Lamb, Inc. | Expandable bit with secondary release device |
| US7128154B2 (en) | 2003-01-30 | 2006-10-31 | Weatherford/Lamb, Inc. | Single-direction cementing plug |
| USRE42877E1 (en) | 2003-02-07 | 2011-11-01 | Weatherford/Lamb, Inc. | Methods and apparatus for wellbore construction and completion |
| US7096982B2 (en) | 2003-02-27 | 2006-08-29 | Weatherford/Lamb, Inc. | Drill shoe |
| US7360594B2 (en) | 2003-03-05 | 2008-04-22 | Weatherford/Lamb, Inc. | Drilling with casing latch |
| US7191840B2 (en) | 2003-03-05 | 2007-03-20 | Weatherford/Lamb, Inc. | Casing running and drilling system |
| US7413020B2 (en) | 2003-03-05 | 2008-08-19 | Weatherford/Lamb, Inc. | Full bore lined wellbores |
| US7370707B2 (en) | 2003-04-04 | 2008-05-13 | Weatherford/Lamb, Inc. | Method and apparatus for handling wellbore tubulars |
| US7650944B1 (en) | 2003-07-11 | 2010-01-26 | Weatherford/Lamb, Inc. | Vessel for well intervention |
| US7264067B2 (en) | 2003-10-03 | 2007-09-04 | Weatherford/Lamb, Inc. | Method of drilling and completing multiple wellbores inside a single caisson |
| US7284617B2 (en) | 2004-05-20 | 2007-10-23 | Weatherford/Lamb, Inc. | Casing running head |
| US7503397B2 (en) | 2004-07-30 | 2009-03-17 | Weatherford/Lamb, Inc. | Apparatus and methods of setting and retrieving casing with drilling latch and bottom hole assembly |
| US7857052B2 (en) | 2006-05-12 | 2010-12-28 | Weatherford/Lamb, Inc. | Stage cementing methods used in casing while drilling |
| US8276689B2 (en) | 2006-05-22 | 2012-10-02 | Weatherford/Lamb, Inc. | Methods and apparatus for drilling with casing |
| CN110424897A (en) * | 2019-08-27 | 2019-11-08 | 中铁第四勘察设计院集团有限公司 | Bottom expanding drill afterwards |
| CN110424897B (en) * | 2019-08-27 | 2024-06-07 | 中铁第四勘察设计院集团有限公司 | Post-reaming bit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| GB838833A (en) | Expansible rotary drill bit | |
| GB994665A (en) | Portable oil well drilling apparatus | |
| GB897893A (en) | Combination drill bit | |
| GB1169407A (en) | Method for Guiding the Drilling of Oil Wells. | |
| GB1067975A (en) | Adapter device for percussion drill | |
| GB557335A (en) | Annular boring tool | |
| GB939653A (en) | Roller-type enlarging or reaming bit | |
| GB560911A (en) | Improvements in or relating to centre drills | |
| GB497877A (en) | Expansible cutter tool | |
| SU124897A1 (en) | Crown for drilling "boilers" | |
| GB471794A (en) | Improvements in packing heads for wells | |
| GB774075A (en) | Improvements in or relating to drilling bits for drilling earth formations | |
| GB636768A (en) | Improvements relating to drilling appliances | |
| GB835919A (en) | Under-reaming tool | |
| GB502203A (en) | Expansible cutter tool | |
| SU90022A1 (en) | Burov crown | |
| GB947835A (en) | Improvements in or relating to drill bits | |
| GB766242A (en) | Rotary expansible well drill bits | |
| GB273134A (en) | Rock drill bit | |
| GB1111256A (en) | Method and device for widening a drill-hole in rock | |
| CA528324A (en) | Hard metal bodies forming cutting edges in percussive rock drilling tools | |
| FR1208242A (en) | Lubricant seal, especially for drill bits for soil drilling | |
| GB870902A (en) | Improvements relating to cutting, drilling or boring tools | |
| GB873482A (en) | Improvements in or relating to apparatus for drilling and working in underwater wells | |
| GB594473A (en) | Improvements relating to reamers, boring tools and the like |