| Patent Number |
Title Of Patent |
Date Issued |
| 4969378 |
Case hardened roller cutter for a rotary drill bit and method of making |
November 13, 1990 |
| A roller cutter (28) for a rotary drill bit (10) and method of making, utilizing an ion nitriding hardening process for the external surface (42) and the internal bearing surfaces (33, 34, 38) in the central cavity (30) of the roller cutter (28). The roller cutter (28) is made from a thr |
| 4940099 |
Cutting elements for roller cutter drill bits |
July 10, 1990 |
| A rotary drill bit (10) having a plurality of roller cutters (20) with rows (32A, 32B, 32C, 32D) of cutting inserts (34,36,38,40) mounted within sockets (35,46) on the frusto-conical cutter body (30). The cutting inserts 34,36,38,40) have cutting surfaces formed with a wear-resistant |
| 4911255 |
Means for retaining roller cutters on rotary drill bit |
March 27, 1990 |
| A roller cutter (28) of a drill bit (10) is retained on a journal (24) for rotation by a retainer ring (82) having external screw threads (88) which are threaded onto mating screw threads (108) on the roller cutter (28) for rotation therewith. The retainer ring (82) is mounted within a |
| 4907662 |
Rotary drill bit having improved mounting means for multiple cutting elements |
March 13, 1990 |
| A drag type drill bit (10) having a plurality of solid block-like holders (30, 32, 34) secured to and projecting from the bit body (12), each holder (30) having a plurality of cutting elements (36) thereon defining spaced cutting edges 54. Each cutting element (36) has a planar cutting f |
| 4887493 |
Roller cutter drill bit and method of forming |
December 19, 1989 |
| A rolling cutter (24) for a rotary drill bit (10) having cutting inserts or elements (52) mounted within sockets (54) in a so-called full shrink process. The rolling cutter (24) is heated to a temperature over around 500.degree. F. in a controlled inert atomsphere in an enclosed heat |
| 4848489 |
Drag drill bit having improved arrangement of cutting elements |
July 18, 1989 |
| A drag type rotary bit (10) having a plurality of arcuate blades (24A-24E) each having a row of cutting elements (36A-36G) thereon. The cutting elements (36A-36G) are arranged on the arcuate blades (24A-24E) with around one-half of the length of the arcuate blades (24A-24B) being pos |
| 4848476 |
Drill bit having offset roller cutters and improved nozzles |
July 18, 1989 |
| A triple cone drill bit (10, 10A) comprising a plurality of conical roller cutters (16, 16A) having hard metal cutting elements thereon and being so positioned relative to each other that their rotational axes are offset from the rotational axis of the drill bit (10, 10A), and a drilling |
| 4838365 |
Seal assembly for rotary drill bits |
June 13, 1989 |
| A seal assembly for a roller cutter bit mounted in an annular cavity between a roller cutter and a journal. A mechanical spring on the roller cutter urges in an axial direction sealing faces on respective rigid seals into sealing engagement with each other against the bias of an opposed |
| 4830123 |
Mounting means for cutting elements in drag type rotary drill bit |
May 16, 1989 |
| A drag type rotary drill bit (10) having mounted on its lower face (22) a rigid integral holder (30) for a plurality of polycrystalline diamond compact (PDC) cutting elements (42) secured to a planar face (60) of the holder (30). An upper projecting tapered end portion (71) of the holder |
| 4794994 |
Drag drill bit having improved flow of drilling fluid |
January 3, 1989 |
| A drag type rotary bit (10) having polycrystaline diamond compact (PDC) cutting elements arranged in a plurality of rows extending from the center of the bit body (12) to the outer peripheral surface (20) thereof. A fluid discharge nozzle (38A-38F) is provided for each row of cutting ele |
| 4776412 |
Nozzle assembly for rotary drill bit and method of installation |
October 11, 1988 |
| A rotary drill bit (10) has a nozzle assembly (24) positioned within a nozzle bore (22). Nozzle assembly (24) has a nozzle member (34) with a port (40) deviated from the longitudinal axis of the nozzle member (34). A retaining nut (54) is threaded within the threaded bore (22) while the |
| 4741406 |
Drill bit having offset roller cutters and improved nozzles |
May 3, 1988 |
| A tri-cone drill bit (10, 10A) comprising a plurality of conical roller cutters (16, 16A) having hard metal cutting elements thereon and being so positioned relative to each other that their rotational axes are offset from the rotational axis of the drill bit (10, 10A), and a drilling fl |
| 4688647 |
Drill bit having a failure indicator |
August 25, 1987 |
| A drill bit comprising a bit body detachably secured to a drill string having a chamber therein to receive drilling fluid at a first pressure from the drill string, a nozzle for exit of the drilling fluid to the space between the bit body and the well bore at a second pressure lower |
| 4682663 |
Mounting means for cutting elements in drag type rotary drill bit |
July 28, 1987 |
| A drag type rotary drill bit (10) having mounted on its lower face (22) a rigid integral holder (30) for a plurality of polycrystalline diamond compact (PDC) cutting elements (42) secured to a planar face (60) of the holder (30). An upper projecting tapered end portion (71) of the holder |
| 4646857 |
Means to secure cutting elements on drag type drill bits |
March 3, 1987 |
| A metal matrix (53) of a blade (30) on a drag-type rotary drill bit (10) is formed about a plurality of diamond cutting elements (56) so that the entire surface areas of the cutting faces (62) are exposed and engage the formation to be cut in a drilling operation. The cutting elements (5 |
| 4623028 |
Seal assembly for drill bits |
November 18, 1986 |
| A seal assembly (34) for a roller cutter drill bit (10). Seal assembly (34) has an elastomeric resilient O-ring 44 adjacent one sealing surface and a dynamic elastomeric O-ring (46) adjacent another sealing surface. A rigid carrier (52) is mounted between the O-rings (44, 46) which are u |
| 4619534 |
Roller cutter drill bit having a texturized seal member |
October 28, 1986 |
| A rotary drill bit comprising a bit body having at least one depending leg at its lower end having a generally cylindrical bearing journal, a roller cutter of generally conical shape having a recess therein receiving the journal a bearing system for rotatably mounting the roller cutter o |
| 4618269 |
Hardened bearing surface and method of forming same |
October 21, 1986 |
| A hardened bearing surface (36, 38, 42, 48, 50, 51 and 52) on a component (14, 16) of a rotary cutter drill bit (10) and the method of forming same. A composite mix (60) of alloy material (56) and base material (54) forms the hardened bearing surface (36, 38, 42, 48, 50, 51 and 52) with |
| 4610313 |
Drill bit having a failure indicator |
September 9, 1986 |
| A drill bit comprising a bit body detachably secured to a drill string having a chamber therein to receive drilling fluid at a first pressure from the drill string, a nozzle for exit of the drilling fluid to the space between the bit body and the well bore at a second pressure lower |
| 4606418 |
Cutting means for drag drill bits |
August 19, 1986 |
| A rotary drill bit (10) having a plurality of diamond cutting elements (48) each having a cutting face (60) with a discharge nozzle (64) therein. The discharge nozzle (64) directs the flow of drilling fluid away from the cutting face (60) and is surrounded by the cutting face (60). |
| 4599921 |
Method and apparatus for machining a workpiece |
July 15, 1986 |
| A method and apparatus for machining on a rotary lathe (L) the bearing journal (14) of an elongate rotary drill bit body section or so-called lug (W). A workpiece holder (H) adapted to be removed from and positioned on the lathe (L) grips the bit body section (W) in a predetermined posit |
| 4595067 |
Rotary drill bit, parts therefor, and method of manufacturing thereof |
June 17, 1986 |
| A roller cutter for a rotary drill bit comprising a conical roller cutter body of metal, and a plurality of cutting elements secured to the outer surface of the roller cutter body primarily by welding and being substantially free of mechanical interconnection to the roller cutter bod |
| 4546837 |
Drill bit having angled nozzles for improved bit and well bore cleaning |
October 15, 1985 |
| A rotary drill bit for drilling a well bore comprising a bit body adapted to be detachably secured to a drill string and receive drilling fluid under pressure therefrom and having a plurality of depending legs and a nozzle system for exit of drilling fluid from the bit body. The drill bi |
| 4446935 |
Intermittent high-drag oil well drilling bit |
May 8, 1984 |
| Methods and apparatus are disclosed for the rapid and efficient drilling of oil well and other types of bore holes through tough abrasive underground formations, which methods and apparatus utilize high drag intermittent contact and cooling techniques to provide good rates of penetration |
| 4293167 |
Rolling cutter drill bit with improved journal configuration |
October 6, 1981 |
| A rolling cutter drill bit is disclosed which utilizes a plurality of rolling cutters each rotatably mounted on a lug member having a downwardly extending bearing journal. Each bearing journal has a ball bearing race formed therein for receiving a series of ball bearings which also seat |
| 4277108 |
Hard surfacing for oil well tools |
July 7, 1981 |
| A method is disclosed for applying to rotating well drilling parts such as tool joints a multiple layer of hardbanding materials to provide extended wear service for the well tools without incurring any of the accompanying spalling normally associated with heavy layers of hardbanding. |
| 4256191 |
Intermittent high-drag oil well drilling methods and apparatus |
March 17, 1981 |
| Methods and apparatus are disclosed for the rapid and efficient drilling of oil well and other types of bore holes through tough abrasive underground formations, which methods and apparatus utilize high drag intermittent contact and cooling techniques to provide good rates of penetration |
| 4254840 |
Drill bit insert |
March 10, 1981 |
| A protruding insert for use in an oil well drill bit is disclosed which insert is made of a hard metal substance and utilizes a tangential spherical surface having opposed flattened sides. |
| 4241798 |
Drilling bits for plastic formations |
December 30, 1980 |
| Drilling bits are disclosed which are particularly efficient drilling devices when used in soft plastic underground formations which normally are difficult or impossible to drill with conventional drilling bits. The bits of this invention are characterized by having relief openings forme |
| 4158973 |
Rolling cutter drill bit |
June 26, 1979 |
| A rolling cutter drill bit is disclosed which utilizes a main body having a threaded end for connection in a drill string, and a plurality of rolling cutter assemblies joined to the bottom of the bit body by means such as electron beam welding. |
| 4157057 |
Single acting piston |
June 5, 1979 |
| A single acting pump has a piston with an elastomeric and synthetic fabric seal ring and is provided with means to supply fluid to the piston and passages in the piston for circulating fluid to cool and clean the piston on both the pressure stroke and the back stroke. The passages in the |
| 4090489 |
Fracture toughness test method |
May 23, 1978 |
| An improved method for testing fracture toughness of tungsten carbide, and more particularly sintered tungsten carbide, consists of preparing a specimen from a short rod of sample material by cutting thin longitudinal slots forming a V within the slotted portion of the sample. An initial |
| 4080091 |
Drill bit |
March 21, 1978 |
| A rotary drill bit having a plurality of journal-mounted rotating cutters and jet passageways through which drilling fluid is discharged between the cutters is provided with removable nozzles for air or other drilling fluid. The nozzles are provided with a peripheral groove and secured i |
| 4075886 |
Fracture toughness test method |
February 28, 1978 |
| An improved method for testing fracture toughness of tungsten carbide, and more particularly sintered tungsten carbide, consists of preparing a specimen from a short rod of sample material by cutting thin longitudinal slots forming a V within the slotted portion of the sample. An initial |
| 4074922 |
Drill bit |
February 21, 1978 |
| A roller cutter drill bit comprises a body having a journal, a roller cutter, bearing means for rotatively mounting a roller cutter on the journal and a part of said bearing means including a hard, tough metal bushing with a lubricant metal coated thereon, and positioned between the |
| 4069878 |
Raise drilling bit with detachable stem |
January 24, 1978 |
| A rotary drill bit for producing a raise bore about a pilot hole comprises a drill head having an upper surface for mounting cutter assemblies and lower surface spaced from said upper surface. The upper and lower surfaces are secured to and connected by a body sub. A drive stem is remova |
| 4059316 |
Bearing retaining pin for earth boring drill |
November 22, 1977 |
| A roller cutter type earth boring drill having a ball bearing race filled with ball bearings through an external passage has the passage filled with a bearing retaining plug having a symmetrically cut end portion fitting the curvature of the bearing race. |
| 4054180 |
Impact drilling tool having a shuttle valve |
October 18, 1977 |
| An impact drilling tool for rotary drilling which includes a reciprocating hammer inside a casing for striking the top of an anvil. A drilling bit is connected to the opposite end of the anvil for cutting into the earth's formations. The casing is connected in a string of drilling pipe t |
| 4053306 |
Tungsten carbide-steel alloy |
October 11, 1977 |
| A wear resistant hard metal composition or alloy, comprises 1 - 20 micron particles of tungsten carbide or tungsten carbide and up to about ten percent cobalt or nickel embedded uniformly throughout a steel matrix of high tungsten content. The method of making the alloy composition c |
| 4043611 |
Hard surfaced well tool and method of making same |
August 23, 1977 |
| A wear resistant tubular well tool, such as a tool joint, comprises a hollow cylindrical body having a hard metal, such as a coarse-grained sintered tungsten carbide, deposited on a portion of the exterior of the body and a fine-grained hard metal, such as a cast tungsten carbide, de |
| 4037673 |
Roller cutter drill bit |
July 26, 1977 |
| An earth boring drill employing roller cutters is provided with a seal in a peripheral groove to inhibit ingress of detritus into the cutter bearing area and egress of lubricant therefrom. The shape of the seal is such that its cross section is not overly compressed or displaced when in |
| 4016944 |
Pneumatic hammer-auger earth boring apparatus |
April 12, 1977 |
| An improved earth boring apparatus for soft, hard, and heterogenous formations utilizes a pneumatic hammer combined with an earth boring auger. The pneumatic hammer is supported inside a hollow case of the auger and has a small pilot bit and a large rigid bit plate having the same di |
| 4003442 |
Detachable drill bit for impact drilling |
January 18, 1977 |
| An impact drilling apparatus has an anvil inside a casing for receiving impact blows from a hammer. The lower end of the anvil is threadably connected to a drill bit having an external load bearing shoulder. On the lower end of the casing is attached a driver guide sub which extends |
| 3998283 |
Earth boring auger |
December 21, 1976 |
| An earth boring auger having a shaft and helical flights thereon and a plurality of disc cutters mounted below the flights to engage the formation before it is engaged by the flights. |
| 3998282 |
Earth boring auger |
December 21, 1976 |
| An earth boring auger having a shaft and helical flights thereon and a plurality of disc cutters mounted below the flights and behind the leading edge thereof to engage the formation before it is engaged by the flights. |
| 3990751 |
Drill bit |
November 9, 1976 |
| A roller cutter drill bit with a body having a journal, a roller cutter, bearing means for rotatively mounting the roller cutter on the journal and a part of said bearing means including a maraging steel sleeve with a lubricant between the sleeve and the journal and between the sleeve an |
| 3989315 |
Drill bit |
November 2, 1976 |
| A drill bit having a roller cutter supported by ball bearings and a ball retainer retained in position both axially and rotationally within the ball loading hole by a plug which is mechanically wedged into secured and sealed position within the outer end of the ball loading hole. |
| 3971600 |
Drill bit |
July 27, 1976 |
| A drill bit having a body with a shaft thereon, a roller cutter, an annular thrust bearing, means for connecting said roller cutter to the thrust bearing, means for retaining said thrust bearing on the shaft, and a lubrication system containing the thrust bearing and the retaining means |
| 3970106 |
Collapsible ball valve |
July 20, 1976 |
| A collapsible ball check valve for use in high pressure pneumatic devices to prevent a backflow upon loss of the high pressure while, simultaneously, not requiring a pressure loss to operate the check valve. The pressure of the fluid causes the hollow ball to collapse inwardly, there |
| 3964551 |
Pneumatic impact drilling tool |
June 22, 1976 |
| A pneumatically operated impact drilling tool for rotary drilling, includes a reciprocating hammer, an anvil positioned under the hammer and a feeder means extending through the hammer. The drilling tool is connected in a string of drilling pipe and high pressure pneumatic fluid flowing |
