[go: up one dir, main page]

US20100101750A1 - Two piece mold used in manufacture of PDC drill bits and method of using same - Google Patents

Two piece mold used in manufacture of PDC drill bits and method of using same Download PDF

Info

Publication number
US20100101750A1
US20100101750A1 US12/288,889 US28888908A US2010101750A1 US 20100101750 A1 US20100101750 A1 US 20100101750A1 US 28888908 A US28888908 A US 28888908A US 2010101750 A1 US2010101750 A1 US 2010101750A1
Authority
US
United States
Prior art keywords
core
shell
mold
cavity
graphite
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
US12/288,889
Inventor
Michael M. Tomczak
Vincente S. Salvo
Juan Rios
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.)
OMNI LP Ltd
Original Assignee
OMNI LP Ltd
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 OMNI LP Ltd filed Critical OMNI LP Ltd
Priority to US12/288,889 priority Critical patent/US20100101750A1/en
Assigned to ENCORE BITS, LLC reassignment ENCORE BITS, LLC ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: RIOS, JUAN, SALVO, VINCENTE S., TOMCZAK, MICHAEL M.
Priority to PCT/US2009/005742 priority patent/WO2010047802A1/en
Priority to US12/590,561 priority patent/US20100101747A1/en
Assigned to OMNI LP LTD. reassignment OMNI LP LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ENCORE BITS, LLC
Publication of US20100101750A1 publication Critical patent/US20100101750A1/en
Assigned to OMNI IP LTD. reassignment OMNI IP LTD. ADDRESS CHANGE AND CORRECTION R/F 024051/0140 Assignors: OMNI IP LTD.
Priority to US12/806,704 priority patent/US20110056751A1/en
Abandoned legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/02—Sand moulds or like moulds for shaped castings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/10—Cores; Manufacture or installation of cores
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/22—Moulds for peculiarly-shaped castings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D19/00—Casting in, on, or around objects which form part of the product
    • B22D19/06—Casting in, on, or around objects which form part of the product for manufacturing or repairing tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D23/00—Casting processes not provided for in groups B22D1/00 - B22D21/00
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • B23P15/24—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass dies
    • 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

Definitions

  • This invention relates generally to the manufacture of fixed cutter drill bits used to drill oil and gas wells.
  • Bits typically used for drilling boreholes in the oil and gas industry include roller cone bits and fixed cutter bits.
  • Cutting structures on bits vary depending on the type of bit and the type of formation being cut.
  • Roller cone cutting structures typically include milled steel teeth, tungsten carbide inserts, or diamond enhanced inserts.
  • Cutting structures for fixed cutter bits typically include polycrystalline diamond compacts, commonly referred to as “PDC” cutters.
  • PDC polycrystalline diamond compacts
  • Fixed cutter drill bits also referred to as fixed head bits or drag bits, are generally more expensive than mill tooth roller cone drill bits and are considered to offer less aggressive cutting structures than roller cone drill bits. However, in several applications, fixed cutter bits can be used to drill longer well segments in a single run and can be rebuilt and reused multiple times to provide an overall economic benefit that outweighs the higher cost. Fixed cutter bits which include PDC cutters are typically referred to as PDC bits.
  • FIG. 1 of the drawings illustrates a conventional single piece graphite mold which is known in the prior art for manufacturing the carbide matrix body for a PDC drill bit.
  • FIG. 1 is a pictorial, isometric view of a graphite mold known in the prior art used for manufacturing a carbide matrix body for PDC drill bits;
  • FIGS. 2A , 2 B and 2 C respectively illustrate an exploded view of the two piece mold in accordance with the present invention
  • FIG. 3A illustrates another view of the elements illustrated in FIGS. 2A , 2 B and 2 C, as assembled, after the drill bit has been at least partially milled in accordance with invention
  • FIG. 3B is a schematic view, partially in cross section, illustrating the assembled two piece mold and the gauge ring which is used as a funnel, illustrated in FIG. 2C , resting on top of the two piece mold illustrated in FIGS. 2A and 2B ;
  • FIG. 4A is an elevated, schematic view, in cross section, illustrating the mold core illustrated in FIG. 2 mounted within the mold shell illustrated in FIG. 2A and having the gauge ring illustrated in FIG. 2 sitting on top of the mold part shown in FIG. 2B ;
  • FIG. 4B is a top plan, schematic view of the embodiment illustrated in FIG. 4A , but without its top portion illustrated;
  • FIG. 5 is a side view, in cross section of the mold shell illustrated in FIG. 2A in accordance with the invention.
  • FIG. 6 is a side view, in cross section, illustrating the mold core illustrated in FIG. 2B , which in operation resides within the mold shell illustrated in FIG. 5 ;
  • FIG. 7 is a pictorial, isometric view of the assembled two piece mold illustrated in FIGS. 2A and 2B , and having a drill bit residing within the interior of the mold core in FIG. 2B in accordance with the invention.
  • FIG. 8 illustrates the equipment used in milling the drill bit within the mold core illustrated in FIG. 2B while resting on a fixture to support the mold core illustrated in FIG. 2B .
  • FIG. 1 is a pictorial, isometric view of the one piece mold which is commonly used in the PDC drill bit industry to manufacture PDC bits.
  • the mold 10 has a lower portion 12 and an upper ring 14 which contains a cavity which is used as the mold for manufacturing the PDC bit body.
  • the mold is first partially filled with a tungsten carbide powder to which is then applied a metal alloy, such as a nickel alloy. Upon heating, the nickel alloy will mix with the molten tungsten carbide, which upon cooling results in a carbide matrix which forms the bit body in the prior art.
  • a conventional milling process such as is illustrated in FIG. 8 having milling device 16 is then used to mill out the various components of the matrix body to result in a finished PDC matrix body.
  • the mold 10 is removed from the molded graphite 18 , typically by breaking the mold 10 with a hammer, a crowbar or the like. This results in a lot of wasted material because the mold 10 cannot be reused because of its broken condition.
  • FIGS. 2A , 2 B and 2 C there is illustrated a mold shell 30 and a mold core 32 which is illustrated in FIG. 2B .
  • the mold core 32 is sized to closely fit within the cavity 34 illustrated in FIG. 2A which allows the mold core 32 to be easily removed from the shell 30 after the molding process has been completed.
  • the mold shell 30 is not broken and can be reused several times in the molding process.
  • the milling process has been used to at least partially complete the milling of the matrix body to result in a matrix drill bit body.
  • Gauge ring 36 which sits on top of the mold shell 30 , surrounds the cavity in the mold core 32 , all is illustrated in FIG. 4A .
  • the funnel 38 through which the nickel alloy and the tungsten carbide powder is filled, allows the tungsten carbide powder and the nickel alloy to go into the cavity within the mold core 32 as illustrated in FIG. 2B .
  • Sitting atop the funnel 38 is a top end piece 42 .
  • the end cap 42 can be threaded onto the top of the funnel 38 or can merely sit on top of the funnel as desired.
  • the drill bit parts are illustrated schematically, such as the nozzles 44 and the other components such as the cutter pockets 46 which will eventually house the PDC cutters once all the molding process has been completed. All of these parts of the conventional PDC bit are well known in the art and need no further description herein.
  • FIG. 4B illustrates a top plan view of the mold shell, mold core and gauge ring, as well as carbide matrix which has been milled to accept the various components of the finished drill bit in accordance with the invention.
  • FIG. 7 is a pictorial, isometric view of the two piece mold according to the invention, is much like the embodiment of FIG. 3A , but having the milling process further completed for forming the various components of the PDC drill bit.
  • the core 32 is easily removed from the mold shell 30 , without any need to break the mold shell 30 , all as contemplated by the present invention.
  • the matrix body for the drill bit can then be removed from the mold core, with breaking of the mold core as may be necessary. It allows a mold shell to be used several times without a need to break the shell as done in the prior art single piece molds.
  • the use of the two piece mold enables the manufacture of several sized PDC bit bodies from a single size mold shell which cannot be done in the prior art because the one piece mold is broken with a single use and does not allow the manufacture of different sized drill bit bodies to be made from a one piece mold, or even a repetition of the process for the same sized bits using the same shell.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Fluid Mechanics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Manufacturing & Machinery (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)

Abstract

A graphite core mold having its own cavity is pressed into a cavity of a graphite shell mold. The core cavity is filled with tungsten carbide, mixed with a nickel alloy, heated and then cooled to thereby provide a carbide matrix body. After milling the carbide matrix body to thereby provide a carbide bit body, the intact shell mold is removed and then used again.

Description

    BACKGROUND OF INVENTION
  • This invention relates generally to the manufacture of fixed cutter drill bits used to drill oil and gas wells.
  • Various types of drill bits have been developed and found useful in different drilling environments. Bits typically used for drilling boreholes in the oil and gas industry include roller cone bits and fixed cutter bits. Cutting structures on bits vary depending on the type of bit and the type of formation being cut. Roller cone cutting structures typically include milled steel teeth, tungsten carbide inserts, or diamond enhanced inserts. Cutting structures for fixed cutter bits typically include polycrystalline diamond compacts, commonly referred to as “PDC” cutters. The selection of a bit type and cutting structure for a given drilling application depends on many factors including the formation type to be drilled, rig equipment capabilities, and the time and cost associated with drilling.
  • It is common in the art of manufacturing PDC, fixed cutter drill bits, to manufacture the carbide matrix body of the drill bit in a graphite mold. Such a mold known in the prior art is typically made with a single mold manufactured from graphite.
  • Fixed cutter drill bits, also referred to as fixed head bits or drag bits, are generally more expensive than mill tooth roller cone drill bits and are considered to offer less aggressive cutting structures than roller cone drill bits. However, in several applications, fixed cutter bits can be used to drill longer well segments in a single run and can be rebuilt and reused multiple times to provide an overall economic benefit that outweighs the higher cost. Fixed cutter bits which include PDC cutters are typically referred to as PDC bits.
  • FIG. 1 of the drawings illustrates a conventional single piece graphite mold which is known in the prior art for manufacturing the carbide matrix body for a PDC drill bit.
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • FIG. 1 is a pictorial, isometric view of a graphite mold known in the prior art used for manufacturing a carbide matrix body for PDC drill bits;
  • FIGS. 2A, 2B and 2C respectively illustrate an exploded view of the two piece mold in accordance with the present invention;
  • FIG. 3A illustrates another view of the elements illustrated in FIGS. 2A, 2B and 2C, as assembled, after the drill bit has been at least partially milled in accordance with invention;
  • FIG. 3B is a schematic view, partially in cross section, illustrating the assembled two piece mold and the gauge ring which is used as a funnel, illustrated in FIG. 2C, resting on top of the two piece mold illustrated in FIGS. 2A and 2B;
  • FIG. 4A is an elevated, schematic view, in cross section, illustrating the mold core illustrated in FIG. 2 mounted within the mold shell illustrated in FIG. 2A and having the gauge ring illustrated in FIG. 2 sitting on top of the mold part shown in FIG. 2B;
  • FIG. 4B is a top plan, schematic view of the embodiment illustrated in FIG. 4A, but without its top portion illustrated;
  • FIG. 5 is a side view, in cross section of the mold shell illustrated in FIG. 2A in accordance with the invention;
  • FIG. 6 is a side view, in cross section, illustrating the mold core illustrated in FIG. 2B, which in operation resides within the mold shell illustrated in FIG. 5;
  • FIG. 7 is a pictorial, isometric view of the assembled two piece mold illustrated in FIGS. 2A and 2B, and having a drill bit residing within the interior of the mold core in FIG. 2B in accordance with the invention; and
  • FIG. 8 illustrates the equipment used in milling the drill bit within the mold core illustrated in FIG. 2B while resting on a fixture to support the mold core illustrated in FIG. 2B.
    •  DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
  • Referring now to the drawings in more detail, FIG. 1 is a pictorial, isometric view of the one piece mold which is commonly used in the PDC drill bit industry to manufacture PDC bits. The mold 10 has a lower portion 12 and an upper ring 14 which contains a cavity which is used as the mold for manufacturing the PDC bit body. In the process of using the prior art mold illustrated in FIG. 1, the mold is first partially filled with a tungsten carbide powder to which is then applied a metal alloy, such as a nickel alloy. Upon heating, the nickel alloy will mix with the molten tungsten carbide, which upon cooling results in a carbide matrix which forms the bit body in the prior art. A conventional milling process such as is illustrated in FIG. 8 having milling device 16 is then used to mill out the various components of the matrix body to result in a finished PDC matrix body.
  • In using the single piece mold of the prior art illustrated in FIG. 1, as soon as the process has been finished as illustrated in FIG. 1, the mold 10 is removed from the molded graphite 18, typically by breaking the mold 10 with a hammer, a crowbar or the like. This results in a lot of wasted material because the mold 10 cannot be reused because of its broken condition.
  • Referring now to FIGS. 2A, 2B and 2C, there is illustrated a mold shell 30 and a mold core 32 which is illustrated in FIG. 2B. The mold core 32 is sized to closely fit within the cavity 34 illustrated in FIG. 2A which allows the mold core 32 to be easily removed from the shell 30 after the molding process has been completed. The mold shell 30 is not broken and can be reused several times in the molding process. As illustrated in FIG. 2B, the milling process has been used to at least partially complete the milling of the matrix body to result in a matrix drill bit body. Gauge ring 36 which sits on top of the mold shell 30, surrounds the cavity in the mold core 32, all is illustrated in FIG. 4A.
  • The funnel 38 through which the nickel alloy and the tungsten carbide powder is filled, allows the tungsten carbide powder and the nickel alloy to go into the cavity within the mold core 32 as illustrated in FIG. 2B. Sitting atop the funnel 38 is a top end piece 42. The end cap 42 can be threaded onto the top of the funnel 38 or can merely sit on top of the funnel as desired. In FIG. 4A, the drill bit parts, are illustrated schematically, such as the nozzles 44 and the other components such as the cutter pockets 46 which will eventually house the PDC cutters once all the molding process has been completed. All of these parts of the conventional PDC bit are well known in the art and need no further description herein.
  • FIG. 4B illustrates a top plan view of the mold shell, mold core and gauge ring, as well as carbide matrix which has been milled to accept the various components of the finished drill bit in accordance with the invention.
  • FIG. 7 is a pictorial, isometric view of the two piece mold according to the invention, is much like the embodiment of FIG. 3A, but having the milling process further completed for forming the various components of the PDC drill bit. Assuming that the milling process is completed, the core 32 is easily removed from the mold shell 30, without any need to break the mold shell 30, all as contemplated by the present invention. The matrix body for the drill bit can then be removed from the mold core, with breaking of the mold core as may be necessary. It allows a mold shell to be used several times without a need to break the shell as done in the prior art single piece molds. The use of the two piece mold enables the manufacture of several sized PDC bit bodies from a single size mold shell which cannot be done in the prior art because the one piece mold is broken with a single use and does not allow the manufacture of different sized drill bit bodies to be made from a one piece mold, or even a repetition of the process for the same sized bits using the same shell.

Claims (8)

1. A mold for forming a carbide matrix PDC bit body, comprising:
a cylindrical shell having a closed end, an open end and a cavity commencing with the open end of said shell;
a cylindrical core having a closed end, an open end, and a cavity commencing with the open end of said core, said core having an outside diameter sized to closely fit within the inside diameter of the cavity within said shell, wherein the cavity within the core can be filled with a mixture of tungsten carbide powder and particles of a metallic alloy, which when heated and then cooled and then milled, form a carbide matrix PDC bit body.
2. The mold according to claim 1, wherein said core comprises graphite.
3. The mold according to claim 2, where said shell comprises graphite.
4. The mold according to claim 1, wherein the closed end of said core and the closed end of said shell are pressed against each other.
5. The mold according to claim 1, wherein said metallic alloy comprises nickel.
6. A method for molding a carbide matrix body for a PDC drill bit, comprising the steps of:
pressing a graphite core into a graphite shell;
pouring tungsten carbide powder and particles of a metallic alloy into a cavity in said core;
melting the mixture of the powder and the particles within the cavity in the core;
cooling the molten mixture to thereby provide a carbide matrix body;
removing the intact shell from around the core;
milling the carbide matrix body with the desired features of a PDC drill bit; and
removing the core from the carbide matrix body.
7. The method according to claim 6, including the repetition of the steps according to claim 6, using the same graphite shell in the repeated process.
8. The method according to claim 6, wherein the metallic alloy comprises nickel.
US12/288,889 2008-10-24 2008-10-24 Two piece mold used in manufacture of PDC drill bits and method of using same Abandoned US20100101750A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US12/288,889 US20100101750A1 (en) 2008-10-24 2008-10-24 Two piece mold used in manufacture of PDC drill bits and method of using same
PCT/US2009/005742 WO2010047802A1 (en) 2008-10-24 2009-10-22 Two piece mold used in manufacture of pdc drill bits and method of using same
US12/590,561 US20100101747A1 (en) 2008-10-24 2009-11-10 Mold used in manufacture of drill bits and method of forming same
US12/806,704 US20110056751A1 (en) 2008-10-24 2010-08-19 Ultra-hard matrix reamer elements and methods

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US12/288,889 US20100101750A1 (en) 2008-10-24 2008-10-24 Two piece mold used in manufacture of PDC drill bits and method of using same

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
US12/590,561 Continuation-In-Part US20100101747A1 (en) 2008-10-24 2009-11-10 Mold used in manufacture of drill bits and method of forming same

Related Child Applications (2)

Application Number Title Priority Date Filing Date
US12/590,429 Continuation-In-Part US8561725B2 (en) 2008-10-24 2009-11-06 Ultra-hard drill collar
US12/590,561 Continuation-In-Part US20100101747A1 (en) 2008-10-24 2009-11-10 Mold used in manufacture of drill bits and method of forming same

Publications (1)

Publication Number Publication Date
US20100101750A1 true US20100101750A1 (en) 2010-04-29

Family

ID=42116354

Family Applications (1)

Application Number Title Priority Date Filing Date
US12/288,889 Abandoned US20100101750A1 (en) 2008-10-24 2008-10-24 Two piece mold used in manufacture of PDC drill bits and method of using same

Country Status (2)

Country Link
US (1) US20100101750A1 (en)
WO (1) WO2010047802A1 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4140170A (en) * 1977-09-06 1979-02-20 Baum Charles S Method of forming composite material containing sintered particles
US5839329A (en) * 1994-03-16 1998-11-24 Baker Hughes Incorporated Method for infiltrating preformed components and component assemblies
US6655481B2 (en) * 1999-01-25 2003-12-02 Baker Hughes Incorporated Methods for fabricating drill bits, including assembling a bit crown and a bit body material and integrally securing the bit crown and bit body material to one another
US20080028891A1 (en) * 2006-04-28 2008-02-07 Calnan Barry D Molds and methods of forming molds associated with manufacture of rotary drill bits and other downhole tools

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5355750A (en) * 1991-03-01 1994-10-18 Baker Hughes Incorporated Rolling cone bit with improved wear resistant inserts
US7044243B2 (en) * 2003-01-31 2006-05-16 Smith International, Inc. High-strength/high-toughness alloy steel drill bit blank

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4140170A (en) * 1977-09-06 1979-02-20 Baum Charles S Method of forming composite material containing sintered particles
US5839329A (en) * 1994-03-16 1998-11-24 Baker Hughes Incorporated Method for infiltrating preformed components and component assemblies
US6655481B2 (en) * 1999-01-25 2003-12-02 Baker Hughes Incorporated Methods for fabricating drill bits, including assembling a bit crown and a bit body material and integrally securing the bit crown and bit body material to one another
US20080028891A1 (en) * 2006-04-28 2008-02-07 Calnan Barry D Molds and methods of forming molds associated with manufacture of rotary drill bits and other downhole tools

Also Published As

Publication number Publication date
WO2010047802A1 (en) 2010-04-29

Similar Documents

Publication Publication Date Title
US20100101747A1 (en) Mold used in manufacture of drill bits and method of forming same
RU2537462C2 (en) Hard-facing materials including pca-particles, welding bars and drill tools with such materials, methods of their production and application
CA2384401C (en) Roller cone bits with wear and fracture resistant surface
US6102140A (en) Inserts and compacts having coated or encrusted diamond particles
US8776341B2 (en) Method of repairing diamond rock bit
US8973683B2 (en) Heavy duty matrix bit
US8079402B2 (en) Casting method for matrix drill bits and reamers
US8991471B2 (en) Methods of forming earth-boring tools
US20180304381A1 (en) Near-Net Shaped Cutting Tools and Processes and Devices for Making the Same
CN103582738B (en) For the wear indicator of drilling equipment
US8251122B2 (en) Compensation grooves to absorb dilatation during infiltration of a matrix drill bit
CN115210445A (en) Drilling tool with prefabricated parts
US9359824B2 (en) Method for reducing intermetallic compounds in matrix bit bondline
US20100101750A1 (en) Two piece mold used in manufacture of PDC drill bits and method of using same
US20150240566A1 (en) Manufacture of low cost bits by infiltration of metal powders
SE453465B (en) SET TO MAKE A REFRIGERATOR CHANNEL IN A LONG-TERM CUTTING TOOL
US8387677B2 (en) Self positioning of the steel blank in the graphite mold
US12036610B2 (en) Mold for downhole tool or component thereof
CN110102761B (en) Preparation method of microporous hard alloy material
EP0197741A2 (en) Improvements in or relating to rotary drill bits and methods of manufacture thereof
RU2104856C1 (en) Method for producing abrasive tools
EP2899360A2 (en) Method for reducing intermetallic compounds in matrix bit bondline
US20110056751A1 (en) Ultra-hard matrix reamer elements and methods
WO2016069712A1 (en) Methods of manufacturing bit bodies

Legal Events

Date Code Title Description
AS Assignment

Owner name: ENCORE BITS, LLC,TEXAS

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:TOMCZAK, MICHAEL M.;SALVO, VINCENTE S.;RIOS, JUAN;REEL/FRAME:021856/0194

Effective date: 20081111

AS Assignment

Owner name: OMNI LP LTD.,TEXAS

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:ENCORE BITS, LLC;REEL/FRAME:024051/0140

Effective date: 20100304

AS Assignment

Owner name: OMNI IP LTD.,VIRGIN ISLANDS, BRITISH

Free format text: ADDRESS CHANGE AND CORRECTION R/F 024051/0140;ASSIGNOR:OMNI IP LTD.;REEL/FRAME:024534/0647

Effective date: 20100304

STCB Information on status: application discontinuation

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