Marion F Rudy: Diffusion pumping apparatus self-inflating device. Bernard Kriegel, July 20, 1982: US04340626 (221 worldwide citation)

An elastomeric enclosure is initially inflated to a desired pressure by a gas having large molecules incapable of diffusing outwardly from the enclosure, except at a relatively slow rate. When the enclosure is surrounded by ambient air at atmospheric pressure, such air passes into the enclosures by ...

Coy M Fielder: Earth-boring drill bits. Christensen, Bernard Kriegel, Philip Subkow, September 28, 1982: US04351401 (124 worldwide citation)

The invention relates to the design of earth bore-hole drill bits embodying shaped preformed cutters containing hard abrasive materials, such as diamonds, the cutters being mounted in companion preformed sockets in the hard metal bit matrix. The extent of penetration of the preformed cutters into th ...

Larry K Winslow: Method and apparatus for gravel packing well bores. Baker Oil Tools, Bernard Kriegel, June 15, 1976: US03963076 (75 worldwide citation)

A liner provided with by-pass ports and a perforated portion or screen below the ports is secured to a suitable well packer and lowered on an outer tubing string in well casing to a location at which the screen straddles casing perforations within a producing formation, the packer being packed-off a ...

John E Tschirky: Drilling and casing landing apparatus and method. Smith International, Bernard Kriegel, Philip Subkow, Newton H Lee Jr, January 9, 1979: US04133396 (69 worldwide citation)

Casing is run into a well bore hole on a running pipe string. Fluid motor and drill apparatus is supported in the casing, with the drill extending below the lower end of the casing to drill the bore hole in advance of the casing. For subsea drilling operations, the casing is suspended from a riser h ...

Kirk R Shirley: Drill steering apparatus. Bernard Kriegel, July 26, 1983: US04394881 (63 worldwide citation)

Well bore drilling apparatus has a steering tool operable to stabilize the drill string above the drill bit and to selectively cause a lateral force to be applied to the bit to deflect the drill in a selected direction. The apparatus includes master sensors, in the form of pistons, which sense the l ...

Maurice M Emery: Circulation valve for in-hole motors. Smith International, Philip Subkow, Bernard Kriegel, Newton H Lee Jr, November 3, 1981: US04298077 (49 worldwide citation)

An in-hole fluid motor has a stator connected with a fluid conduit and a rotor connected with a drive shaft for a bit to drill a bore hole as drilling fluid is circulated through the conduit and the stator, the fluid returning through the bore hole annulus to the top of the bore hole. A circulation ...

Alfred Ostertag, Claus Marx: Stabilizer for drill strings. Christensen Diamond Products Co, Bernard Kriegel, March 23, 1976: US03945446 (42 worldwide citation)

Stabilizer apparatus for a drill string or other running string, including a body structure forming part of a rotary drill string and a stabilizer positioned on an end portion of said body structure, the stabilizer comprising a stabilizer sleeve having a conical interior surface which is shrink-fitt ...

Rainer Jurgens, Alfred Ostertag: Shrink-fit sleeve apparatus for drill strings. Christensen Diamond Products Company, Bernard Kriegel, February 17, 1976: US03938853 (39 worldwide citation)

Sleeve apparatus for mounting on a cylindrical periphery of a drill string, or other running string, including an inner sleeve having cylindrical interior and a conical exterior disposable at any selected location along a drill string member, an outer sleeve being mounted on the inner sleeve and hav ...

Rainer Jurgens: Shock absorber for well drilling pipe. Christensen, Bernard Kriegel, Philip Subkow, January 9, 1979: US04133516 (37 worldwide citation)

A shock absorber assembly has an outer body connectible at one end in a well drill string and an inner body connectible at one end in the well drilling string, with the bodies telescopically coengaged. Between the bodies is an annular space, filled with hydraulic fluid and containing a pressure equa ...

John E Tschirky, Gary M Crase: Circulation sub for in-hole hydraulic motors. Smith International, Philip Subkow, Bernard Kriegel, November 2, 1976: US03989114 (29 worldwide citation)

This invention relates to circulation subs used in connection with hydraulic in-hole motors with means for selectively interrupting circulation through the circulation sub.