[go: up one dir, main page]

US20130098692A1 - Drill bit - Google Patents

Drill bit Download PDF

Info

Publication number
US20130098692A1
US20130098692A1 US13/636,081 US201113636081A US2013098692A1 US 20130098692 A1 US20130098692 A1 US 20130098692A1 US 201113636081 A US201113636081 A US 201113636081A US 2013098692 A1 US2013098692 A1 US 2013098692A1
Authority
US
United States
Prior art keywords
drill bit
casting
monolithic body
manufacturing
bronze
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.)
Abandoned
Application number
US13/636,081
Other languages
English (en)
Inventor
Michael Wardley
Mitch Bavidge
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tesco Corp Canada
Original Assignee
Tesco Corp Canada
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Tesco Corp Canada filed Critical Tesco Corp Canada
Publication of US20130098692A1 publication Critical patent/US20130098692A1/en
Abandoned legal-status Critical Current

Links

Images

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
    • E21B7/00—Special methods or apparatus for drilling
    • E21B7/20—Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes
    • 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
    • E21B10/46—Drill bits characterised by wear resisting parts, e.g. diamond inserts
    • 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
    • E21B10/42—Rotary drag type drill bits with teeth, blades or like cutting elements, e.g. fork-type bits, fish tail bits
    • 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
    • E21B10/46—Drill bits characterised by wear resisting parts, e.g. diamond inserts
    • E21B10/54—Drill bits characterised by wear resisting parts, e.g. diamond inserts the bit being of the rotary drag type, e.g. fork-type bits
    • E21B10/55—Drill bits characterised by wear resisting parts, e.g. diamond inserts the bit being of the rotary drag type, e.g. fork-type bits with preformed cutting elements
    • 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
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/14—Casing shoes for the protection of the bottom of the casing

Definitions

  • the present invention relates to the field of hydrocarbon exploration. More specifically, the present invention concerns a drill bit suitable for use within a casing drilling process.
  • each casing string Positioned at the end of each casing string is a rounded guiding component known as a shoe.
  • a shoe Positioned at the end of each casing string is a rounded guiding component known as a shoe.
  • the leading edge of the shoe is constructed from cement, to enable it to be easily drilled through by the next drill bit.
  • a proposed solution known in the art is to attach the drill bit to the leading end of the casing string, drill to a target depth and then cement the casing string. Certain advances in recent years have rendered this solution more viable, including the provision of premium casing threads that are able to take the necessary drilling torque, and rotary top drives able to transmit the torque directly to the trailing end of a casing string are now commonplace.
  • drill bits are generally robust devices designed to withstand the rigours of a downhole environment. Traditionally they are made from so called hard materials such as steel or tungsten carbide matrix. If such a drill bit were to be employed within the above described casing string drilling technique then after cementing of the casing string the subsequent drill bit would have to pass through the first drill bit before exiting the end of the casing string.
  • modern drill bits optimised for rock removal are generally unable to drill through the materials from which they themselves are constructed without sustaining a level of damage which would render the task of drilling the next section of rock formation impossible.
  • a casing drilling shoe which is adapted for attachment to the casing string.
  • the drilling shoe comprises an outer drilling section constructed from a relatively hard material e.g. steel, which incorporates a cutting structure made from polycrystalline diamond (PCD) or tungsten carbide matrix.
  • the tool further comprises an inner section constructed from aluminium which is a material known to be readily drillable.
  • the casing drilling shoe further comprises a means for controllably displacing the outer drilling section to a radial position whereby it does not interfere with any subsequent drilling of the shoe. This enables the aluminium inner section to be drilled through using a standard drill bit and subsequently penetrated by a reduced diameter casing string.
  • the casing drilling shoe described in PCT application number PCT/GB99/01816 is extremely expensive to produce due to the requirement to incorporate a displaceable outer drilling section.
  • these tools are also found to be sensitive to vibration and so they are not particularly robust which can cause mechanical failure during the drilling process.
  • a further drawback of the described tool is the use of aluminium for the inner section. As with steel, when aluminium is drilled it tends to form into long strands. These strands then wrap themselves around the secondary drill bit so reducing the efficiency of any subsequent drilling process. Furthermore, aluminium is easily eroded by the action of the drilling fluids which are necessarily used to clean the well bore.
  • the described casing string drill bit is again constructed from a combination of a relatively soft (drillable) material and a relatively hard material.
  • the described drill bit comprises a crown upon which are mounted a plurality of cutting members.
  • the crown and cutting members are constructed from a relatively soft material such as aluminium, copper, nickel or a brass alloy.
  • the cutting members are substantially covered by fragments of a relatively hard material such as tungsten carbide, PCD or cubic boron nitride.
  • a second drill bit is employed to drill through the described casing string drill bit the second drill passes through the relatively soft material and causes the fragments of the relatively hard material to fall away from the crown of the tool. The fragments are then subsequently removed from the well bore by the circulating drilling fluid.
  • a third solution presented in the prior art is that described within PCT application number PCT/US2005/004106.
  • the described casing bit system is of a similar form to that described within PCT application number PCT/GB00/04936 however the tool now comprises a steel alloy crown upon which are mounted a plurality of cutting structures made from PDC or tungsten carbide.
  • To facilitate drilling through the casing bit its inner surface is profiled so as to be suitable for receiving a bespoke secondary drill bit having a complementary outer surface profile that matches the inner surface profile of the casing bit.
  • the cutters of the secondary drill bit are required to have of a low blade height.
  • lower blade heights generally result in lower drilling rates.
  • the rate at which the subsequent subterranean formations can be drilled by the secondary drill bit of this system is reduced.
  • the document also teaches that it is advantageous for the drill through process to modify the cutting structures of the casing bit that are located within the region configured to be drilled through e.g. by making the average amount of abrasive material contained in these regions less than the average amount of abrasive material contained by each of the cutting elements within the peripheral region; or alternatively by forming the cutting elements in this region from a substantially carbide-free material.
  • Such modifications to the casing bit however can be detrimental to the rate at which it can drill the subterranean formations and also the distance that the drill bit may drill before wearing out.
  • a drill bit suitable for drilling a casing in a well bore comprising a monolithic body made from bronze and one or more areas of a relatively hard material mounted on the monolithic body so as to provide a cutter suitable for cutting earth or rock.
  • relatively hard material indicates that the material from which the cutter is made is harder than the material from which the monolithic body is made i.e. bronze.
  • the drill bit By making the drill bit from bronze allows for the drill bit to be drilled through from the proximal side by a conventional drill bit suited to drill the next rock formation section. Furthermore, the employment of bronze has the further advantage that when drilled it reduces to shavings. These shavings are then carried away by a drilling fluid and so do not act as an obstruction to any subsequent apparatus that is advanced into the well.
  • the monolithic body prefferably exhibit a yield strength of at least 45,000 psi although it is most preferable for the yield strength to be at least 60,000 psi. Such yield strengths ensure that the drill bit can be employed to drill through relatively hard formations.
  • Suitable materials for forming the monolithic body are aluminium bronze and nickel aluminium bronze.
  • the monolithic body preferably comprises a crown.
  • the crown may comprise one or more flow by areas.
  • Preferably the crown comprises a mechanical connecter suitable for attaching the drill bit to a drill string.
  • the monolithic body further comprises one or more cutting members.
  • the cutting members may comprise a gauge pad.
  • the gauge pads comprise one more recesses suitable for receiving gauge inserts.
  • the relatively hard material may be mounted on the crown although it is preferable for the relatively hard material to be mounted on the leading edge of the one or more cutting members.
  • the relatively hard material preformed cutters mounted within recesses.
  • the preformed cutters form fragments that are then carried away by a drilling fluid and so do not act as an obstruction to any subsequent apparatus that is advanced into the well.
  • the relatively hard material may comprise PDC.
  • the relatively hard material may comprise tungsten carbide or cubic boron nitride.
  • a drill bit suitable for drilling a casing in a well bore comprising a monolithic body made from a copper alloy and one or more areas of a relatively harder material mounted on the monolithic body so as to provide a cutter suitable for cutting earth or rock.
  • Embodiments of the second aspect of the invention may comprise features to implement the preferred or optional features of the first aspect of the invention or vice versa.
  • a drill bit suitable for drilling a casing in a well bore comprising:
  • the casting of the monolithic body may comprise casting a crown.
  • the crown may comprise one or more flow by areas.
  • casting of the monolithic body may comprise casting one or more cutting members.
  • the cutting members may comprise a gauge pad.
  • the gauge pads comprise one more recesses suitable for receiving gauge inserts.
  • the casting of the bronze may comprise casting an aluminium bronze or nickel aluminium bronze.
  • the casting of the bronze may comprise a casting method selected from the group comprising sand casting, centrifugal casting, continuous casting, permanent mould casting and plaster casting.
  • the heat treating of the cast bronze may provide the monolithic body with a yield strength of at least 45,000 psi, although it is preferable for the yield strength to be at least 60,000 psi.
  • the mounting of the relatively hard material on the monolithic body may comprise the formation of one or more recesses.
  • the recesses may be formed on a leading edge of the one or more cutting members.
  • the recesses may be formed on the crown.
  • the mounting of the relatively hard material on the monolithic body may further comprise the step of attaching preformed cutters within the one or more recesses.
  • Preferably attaching the preformed cutters comprises brazing the cutters within the one or more recesses.
  • the method of manufacturing a drill bit further comprises forming a mechanical connection on the heat treated monolithic body.
  • a drill bit suitable for drilling a casing in a well bore comprising:
  • Embodiments of the fourth aspect of the invention may comprise features to implement the preferred or optional features of the third aspect of the invention or vice versa.
  • FIG. 1 presents a top view of a drill bit in accordance with an embodiment of the present invention
  • FIG. 2 presents a side view of the drill bit of FIG. 1 ;
  • FIG. 3 presents a cross section through the drill bit, as presented in FIG. 2 .
  • a drill bit 1 in accordance with an aspect of the present invention will now be described with reference to FIGS. 1 to 3 .
  • the drill bit 1 is shown mounted to one end of a cylindrical body 2 via a first thread end connection 3 suitable for mating with the body 2 .
  • the opposite end of the cylindrical body 2 is then mounted on the lower end of a casing string (not shown) via a second thread end connection 4 suitable for mating with the casing.
  • the drill bit 1 itself comprises five cutting members 5 (often referred to as blades) located at the opposite end of the drill bit 1 to the first thread end connection 3 , namely at the end where a crown 6 is located. It will be appreciated that the number of cutting members 5 may be varied, as deemed appropriate for the drilling operation.
  • the cutting members 5 extend out from the crown 6 and each cutting member 5 can be seen to comprise a plurality of preformed cutters 7 located within corresponding recesses along a “leading edge” of the cutting members 5 .
  • the “leading edge” refers to the side of the cutting members 5 which directly contacts the ground or rock formation upon rotation of the drill bit 1 .
  • the preformed cutters 7 are produced from a relatively hard material (relative to the material from which the crown and the cutting members are made) and may be in the form of chips, or fragments of the hard material.
  • the hard material may be tungsten carbide or cubic boron nitride although the preferred material is PCD. Further detail of how the preformed cutters 7 are attached to the cutting members 5 is provided below.
  • the cutting members 5 optionally comprise a gauge pads 8 arranged to extend away from the distal end of the drill bit 1 , as are known in the art.
  • each gauge pad 8 can be seen to comprise a plurality of gauge inserts 9 located within corresponding recesses so as to provide physical protection to the gauge pad 8 .
  • the crown 6 further comprises flow by areas 10 that allow for fluid circulated within the well bore to clean and lubricate the surfaces of the drill bit 1 .
  • the body 2 may also comprises a stabiliser or centraliser (not shown), which maintains the drill bit 1 in the centre of the well bore during operation, and reaming members (not shown), which function to remove any irregularities or obstructions from the wall of the bore.
  • a stabiliser or centraliser not shown
  • reaming members not shown
  • the crown 6 , cutting members 5 and gauge pads 8 are formed as a monolithic or unitary body from a copper-based alloy so as to have a minimum yield strength of 45,000 psi although it is preferable for the yield strength to be at least 60,000 psi, as described in further detail below.
  • the copper based alloy is preferably bronze and in particular aluminium bronze or nickel aluminium bronze, corresponding to material codes C95500 and C95800, respectively, within the Unified Numbering System (UNS).
  • the hard wearing cutting material is afforded to the leading edge of one or more cutting members 5 on the drill bit 1
  • the invention is not limited to this configuration.
  • the preformed cutters 7 may be applied directly to the crown 6 in an embodiment having no cutting members 5 .
  • a non-continuous layer of the hard cutting material may coat the crown 6 or the cutting members 5 .
  • the surface of the crown 6 or the cutting members 5 will comprise areas that are not coated.
  • the cumulative effect of the coated areas will be complete circumferential coverage of the diameter of the casing with which the drill bit 1 is located.
  • the requirement for the cylindrical body 2 is removed and the drill bit 1 is mounted directly on the casing string, preferably via the first threaded mount 3 .
  • the drill bit 1 In use, the drill bit 1 is run into a well bore (not shown) from the surface, typically whilst being rotated. The drill bit 1 guides a casing string (not shown) as it is advanced into the newly formed well bore to a predetermined depth. Upon reaching this depth, the casing is cemented to strengthen the lining of the bore.
  • a second drill bit and preferably a conventional drill bit suited to drill the next rock formation section, having a smaller diameter to the first is run from the surface into the well bore inside the casing string.
  • the new drill bit can drill through the bronze material of the original drill bit 1 , and therefore can proceed to a point beyond the depth reached by the original drill bit 1 within the well bore.
  • the drill bit 1 of an aspect of the present invention may also be employed as the second drill bit.
  • the nature of the bronze is such that when drilled it tends to form into small shavings, unlike steel and aluminium which tend to form into long strands.
  • the hard material of the preformed cutters 7 is released from the crown 6 in the form of small fragments.
  • the shavings and fragments are thus deposited into the well bore when the original bit 1 is drilled through and so do not obstruct the well bore or the secondary drill bit and are therefore not detrimental to the subsequent drilling process. In this manner a further section of the bore can be drilled beyond the previously attained depth without damage to the new drill bit and without needing to retrieve the first assembly from the bore.
  • the bronze material is cast so as to form the monolithic or unitary body comprising the crown 6 and where present the cutting members 5 and the gauge pads 8 .
  • a sand casting method is preferably employed however alternative casting methods such as centrifugal, continuous, permanent mould or plaster casting techniques may be employed.
  • the monolithic body is then heat treated so as to provide the drill bit 1 with a yield strength of at least 45,000 psi, although it is preferable for the yield strength to be at least 60,000 psi.
  • a hardening and tempering process known as TQ50 is the preferred heat treating process employed to achieve these desired yield strengths within the cast bronze material.
  • the next stage in the production of the drill bit 1 involves machining the hardened monolithic body so as to form the recesses for receiving the PDC cutters 7 .
  • the recesses may be formed directly on the crown 6 or upon the cutting members 5 as shown in the preferred embodiment of the invention. Where gauge pads 8 are also incorporated with the cutting members 5 appropriate recesses for the gauge inserts 9 are also machined at this stage.
  • the step of machining the hardened monolithic body comprises the production of a mechanical connection 3 on the hardened monolithic body so as to allow the drill bit 1 to be attached to a drill string.
  • the mechanical connection may be a thread end connection.
  • the cutters 7 are attached to the hardened monolithic body.
  • Argo-brazeTM 49 is one such suitable braze alloy for fixing the PDC cutters 7 within the recesses of the hardened monolithic body.
  • This brazing method provides a strong bond between the cutters 7 and the hardened monolithic body such that the cutters 7 do not get sheared from the hardened monolithic body during the operation of the drill bit 1 .
  • the drill bit 1 is suitable for drilling through hard formations without any significant reduction in the efficiency of the drill bit.
  • the completed drill bit 1 can then be attached to the either the cylindrical body 2 or the casing string by means of the thread end connection 3 and employed for drilling a formation as previously described.
  • the present invention is inherent with significant advantages in that the time taken for the drilling operation can be greatly reduced as there is no need to implement complex and timely retrieval operations to recover apparatus from the well bore. As a result the profitable stage of production can be begin much sooner.
  • a further advantage is that unlike the drill bits known to the art, the drill bit of the present invention is drillable by another standard drill bit with the risk of damage to the standard drill bit being minimal. As a result there is no need to employ a bespoke drill bit to drill through the describe drill bit.
  • the bronze allow can be manufactured so as to exhibit the required yield strength and bonding strength with the cutters to make the drill bit suitable for drilling through hard formations.
  • the bronze drill bit when drilled it reduces to shavings. At the same time the preformed cutters are reduced to fragments. The shavings and fragments are then carried away by the drilling fluid and so do not act as an obstruction to any subsequent apparatus that is advanced into the well.
  • the present invention provides a drill bit, and a method for its manufacture, that is suitable for use within a casing drilling process.
  • the drill bit comprises a monolithic body made from bronze, e.g. aluminium bronze or nickel aluminium bronze, and a relatively hard material mounted thereon.
  • the hard material may comprise polycrystalline diamond (PDC), tungsten carbide or cubic boron nitride.
  • the monolithic body comprises a crown and a plurality of cutting members.
  • the hard material may be mounted directly on the crown or, alternatively, on the cutting members.
  • the described drill bit facilitates the drilling of hard rock formations while still being capable of being drilled through by a standard oilfield drill bit.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Mechanical Engineering (AREA)
  • Earth Drilling (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
US13/636,081 2010-03-19 2011-03-18 Drill bit Abandoned US20130098692A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GBGB1004603.5 2010-03-19
GBGB1004603.5A GB201004603D0 (en) 2010-03-19 2010-03-19 Drill bit
PCT/GB2011/050545 WO2011114167A2 (en) 2010-03-19 2011-03-18 Drill bit

Publications (1)

Publication Number Publication Date
US20130098692A1 true US20130098692A1 (en) 2013-04-25

Family

ID=42227989

Family Applications (1)

Application Number Title Priority Date Filing Date
US13/636,081 Abandoned US20130098692A1 (en) 2010-03-19 2011-03-18 Drill bit

Country Status (7)

Country Link
US (1) US20130098692A1 (es)
BR (1) BR112012023658A2 (es)
CA (1) CA2793678A1 (es)
GB (2) GB201004603D0 (es)
MX (1) MX340650B (es)
NO (1) NO20121207A1 (es)
WO (1) WO2011114167A2 (es)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140360790A1 (en) * 2013-06-05 2014-12-11 Kennametal Inc. Edge protector for roof drill bit cutting insert
EP3269919A1 (en) * 2016-07-13 2018-01-17 Varel International, Ind., L.P. Bit for drilling with casing or liner string and manufacture thereof
US11060357B2 (en) 2017-09-29 2021-07-13 Baker Hughes Holdings Llc Earth-boring tools having a selectively tailored gauge region for reduced bit walk and method of drilling with same
RU2766136C1 (ru) * 2021-08-17 2022-02-08 Публичное акционерное общество «Татнефть» имени В.Д. Шашина Долото для бурения на обсадной колонне

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2937941A (en) * 1958-02-24 1960-05-24 Ampco Metal Inc Aluminum bronze alloy containing manganese and chromium and having improved wear resistance
US3663311A (en) * 1969-05-21 1972-05-16 Bell Telephone Labor Inc Processing of copper alloys
US4202751A (en) * 1977-11-28 1980-05-13 Kobe Steel, Ltd. Sacrificial anode and apparatus employing same for treating hot sea water
US4848491A (en) * 1986-11-22 1989-07-18 Reed Tool Company Limited Rotary drill bits
US7395882B2 (en) * 2004-02-19 2008-07-08 Baker Hughes Incorporated Casing and liner drilling bits
US8074749B2 (en) * 2009-09-11 2011-12-13 Weatherford/Lamb, Inc. Earth removal member with features for facilitating drill-through

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2219512A (en) * 1938-03-21 1940-10-29 James W Mccoy Device for surveying drilled holes
US2267833A (en) * 1940-02-09 1941-12-30 Thomas E Mcmahan Well bit guide
US2371489A (en) * 1943-08-09 1945-03-13 Sam P Daniel Drill bit
US6443247B1 (en) * 1998-06-11 2002-09-03 Weatherford/Lamb, Inc. Casing drilling shoe
CA2393754C (en) * 1999-12-22 2009-10-20 Weatherford/Lamb, Inc. Drilling bit for drilling while running casing
CA2516649C (en) * 2003-02-27 2010-01-19 Weatherford/Lamb, Inc. Drill shoe
AU2004237951A1 (en) 2003-05-16 2004-11-25 Pfizer Products Inc. Therapeutic combinations of atypical antipsychotics with GABA modulators, anticonvulsants or benzodiazapines
US7621351B2 (en) * 2006-05-15 2009-11-24 Baker Hughes Incorporated Reaming tool suitable for running on casing or liner
AU2009271124B2 (en) * 2008-07-15 2014-06-26 Baker Hughes Incorporated Earth boring tools and methods of making earth boring tools including an impact material, and methods of drilling through casing
US20100252331A1 (en) * 2009-04-01 2010-10-07 High Angela D Methods for forming boring shoes for wellbore casing, and boring shoes and intermediate structures formed by such methods
SG175249A1 (en) * 2009-06-05 2011-11-28 Varel Int Ind Lp Casing bit and casing reamer designs

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2937941A (en) * 1958-02-24 1960-05-24 Ampco Metal Inc Aluminum bronze alloy containing manganese and chromium and having improved wear resistance
US3663311A (en) * 1969-05-21 1972-05-16 Bell Telephone Labor Inc Processing of copper alloys
US4202751A (en) * 1977-11-28 1980-05-13 Kobe Steel, Ltd. Sacrificial anode and apparatus employing same for treating hot sea water
US4848491A (en) * 1986-11-22 1989-07-18 Reed Tool Company Limited Rotary drill bits
US7395882B2 (en) * 2004-02-19 2008-07-08 Baker Hughes Incorporated Casing and liner drilling bits
US8074749B2 (en) * 2009-09-11 2011-12-13 Weatherford/Lamb, Inc. Earth removal member with features for facilitating drill-through

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140360790A1 (en) * 2013-06-05 2014-12-11 Kennametal Inc. Edge protector for roof drill bit cutting insert
EP3269919A1 (en) * 2016-07-13 2018-01-17 Varel International, Ind., L.P. Bit for drilling with casing or liner string and manufacture thereof
US10428584B2 (en) 2016-07-13 2019-10-01 Varel International Ind., L.P. Bit for drilling with casing or liner string and manufacture thereof
US11060357B2 (en) 2017-09-29 2021-07-13 Baker Hughes Holdings Llc Earth-boring tools having a selectively tailored gauge region for reduced bit walk and method of drilling with same
US11332980B2 (en) 2017-09-29 2022-05-17 Baker Hughes Holdings Llc Earth-boring tools having a gauge insert configured for reduced bit walk and method of drilling with same
US11421484B2 (en) 2017-09-29 2022-08-23 Baker Hughes Holdings Llc Earth-boring tools having a gauge region configured for reduced bit walk and method of drilling with same
RU2766136C1 (ru) * 2021-08-17 2022-02-08 Публичное акционерное общество «Татнефть» имени В.Д. Шашина Долото для бурения на обсадной колонне

Also Published As

Publication number Publication date
MX2012010789A (es) 2013-01-29
BR112012023658A2 (pt) 2017-10-03
WO2011114167A3 (en) 2012-11-15
GB201104595D0 (en) 2011-05-04
NO20121207A1 (no) 2012-10-17
CA2793678A1 (en) 2011-09-22
GB2478856A (en) 2011-09-21
GB2478856B (en) 2013-02-20
GB201004603D0 (en) 2010-05-05
MX340650B (es) 2016-07-15
WO2011114167A2 (en) 2011-09-22

Similar Documents

Publication Publication Date Title
US8561729B2 (en) Casing bit and casing reamer designs
EP2450525B1 (en) Earth boring drill bits with casing component drill out capability, cutting elements for same, and methods of use
US8191654B2 (en) Methods of drilling using differing types of cutting elements
AU776634B2 (en) Drilling bit for drilling while running casing
US7836978B2 (en) Cutting elements for casing component drill out and subterranean drilling, earth boring drag bits and tools including same and methods of use
US20110209922A1 (en) Casing end tool
US11041353B2 (en) Tubular cutting tool
US8245797B2 (en) Cutting structures for casing component drillout and earth-boring drill bits including same
US9580969B2 (en) Cutting assembly suitable for use on a drillable drill bit
US20130098692A1 (en) Drill bit
RU2513562C2 (ru) Пассивные и активные элементы для бурения снизу вверх на буровом инструменте с запрессованными резцами и соответствующие способы

Legal Events

Date Code Title Description
STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION