1
Mark D Mueller, William O Jacobson: Underbalance jet pump drilling method. Union Oil Company of California, Gregory F Wirzbicki, William O Jacobson, October 18, 1994: US05355967 (180 worldwide citation)

A method for rotary drilling and removing cuttings provides a underbalanced drilling fluid pressure at the drilling face but overbalanced pressure in the wellbore. The preferred method uses a rotary drill within a housing which also encloses a jet pump which draws and pressurizes the cuttings and dr ...


2
Jim B Surjaatmadja, Steven L Holden, David D Szarka: Well jetting apparatus. Halliburton Company, Stephen R Christian, Neal R Kennedy, February 27, 1996: US05494103 (134 worldwide citation)

A well jetting apparatus for use in fracturing of a well. Fracture initiation is provided by forming openings through the well casing and then forming fan-shaped slots in the formation surrounding the casing. Those slots are formed by a the jetting apparatus which has at least one hydraulic jet dire ...


3
William J Brady: Roof drill bit with radial domed PCD inserts. Richard G Heywood, July 16, 1996: US05535839 (124 worldwide citation)

A rotary drill bit having a head portion with at least two hard surfaced inserts having domed working surfaces and being oppositely oriented to face in the direction of rotation at positive rake angles, and a mounting adapter for removably securing the drill bit to a drilling machine.


4
Robert P Radtke: Drill bit with carbide coated cutting face. Strata Bit Corporation, Neal J Mosely, August 2, 1983: US04396077 (120 worldwide citation)

A drill bit for connection on a drill string has a hollow tubular body with an end cutting face provided with a tungsten carbide coated surface and an exterior peripheral stabilizer surface with cylindrical sintered carbide inserts positioned therein. Nozzle passages extend from the interior of the ...


5
Griffin Nigel Dennis, Hughes Peter Raymond, Matthias Terry R: Polycrystalline diamond cutters with working surfaces having varied wear resistance while maintaining impact strength. Camco Int, March 27, 2002: EP1190791-A2 (113 worldwide citation)

Disclosed is a polycrystalline diamond or diamond-like element (10) with greatly improved wear resistance without loss of impact strength. These elements are formed with a binder-catalyzing material in a high-temperature, high-pressure (HTHP) process. The PCD element has a body with a plurality of b ...


6
Edward Geller, Mike Kirby, John Mercer, Tom O Hanlon, Jim Reichman, Ken Theimer, Robert Svendsen: Method and apparatus for installment of underground utilities. FlowMole Corporation, Flehr Hohbach Test Albritton & Herbert, June 23, 1987: US04674579 (108 worldwide citation)

A method and apparatus for installing underground utilities using an offset head fluid jet drilling and reaming apparatus. The drill is maneuverable and provides means for remote sensing of orientation and depth. Embodiments are illustrated with single and multiple jet cutting orifices.


7
Asadollah Hayatdavoudi: Jet nozzle. Laney Dougherty Hessin Claro & Beavers, July 30, 1985: US04531592 (95 worldwide citation)

Methods and apparatus are provided for extending the effective length of a jet of fluid exiting a nozzle. An elongated jet extension member extends substantially axially outward from a nozzle outlet, and the jet of fluid flowing along and around the extension member tends to cling to the extension m ...


8
Sven Erik Bjerking, Sven Goran Andersson: Method for prudent penetration of a casing through sensible overburden or sensible structures. Sandvik Rock Tools, Burns Doane Swecker & Mathis, August 23, 1988: US04765416 (91 worldwide citation)

In a subterranean drilling operation, a drill stem and drill bit are advanced downwardly while conducting compressed air downwardly through the drill stem. A minor part of the air flow is discharged from the drill bit downwardly against the sensible overburden, and a major part of the air flow is di ...


9
Mahlon D Dennis: Rotary drill bit. Strata Bit Corporation, Burns Doane Swecker & Mathis, September 3, 1985: US04538691 (89 worldwide citation)

A rotary drill bit includes a cutting face having a peripheral edge and a central recess. A plurality of fluid discharge nozzles are mounted in the cutting face. A plurality of cutter elements are mounted in the peripheral edge and in the recess to fracture an earthen core formed as the drill cuts t ...


10
Mahlon D Dennis: Rotary drill bit. Strata Bit Corporation, Burns Doane Swecker & Mathis, February 3, 1987: US04640374 (88 worldwide citation)

A rotary drill bit includes a cutting face having a peripheral edge and a central recess. A plurality of fluid discharge nozzles are mounted in bores in the cutting face. A plurality of cutter elements are mounted in the peripheral edge and in the recess to fracture an earthen core formed as the dri ...