1
Jack W Romano: Curved bore drilling method and apparatus. James R Vance, July 17, 1990: US04941466 (137 worldwide citation)

A curved bore hole drilling apparatus and method utilizing two power driven drill shafts equipped with flexible shaft sections on the distal ends thereof with each flexible shaft section having a cutting tip. A semicircular channel shaped drill guide loosely engages each flexible shaft end section a ...


2
Leo Donald Maus: Gas lift system for marine drilling riser. Exxon Production Research Company, Salvatore J Casamassima, July 11, 1978: US04099583 (131 worldwide citation)

An improved offshore drilling method and apparatus are disclosed which are useful in preventing formation fracture caused by excessive hydrostatic pressure in a drilling riser. Gas is injected into the riser to provide the lift necessary to return the drilling fluid to the surface and to reduce the ...


3
Larry W Thompson, Macmillan M Wisler, Paul Seaton: Measurement-while-drilling devices with pad mounted sensors. Baker Hughes Incorporated, Madan Mossman & Sriram P C, January 16, 2001: US06173793 (115 worldwide citation)

A Measurement-while-Drilling method and apparatus for obtaining information about a formation uses sensors on substantially non-rotating pads attached to a rotating housing that is part of the drilling assembly. The pads make contact with the formation. The sensors may be density, NMR, resistivity, ...


4
Robert P Hermann, Robert J Scott, John M Shaughnessy: Dynamically positioned, concentric riser, drilling method and apparatus. Transocean Sedco Forex, Bradford E Kile, Kile Goekjian Lerner & Reed PLLC, August 14, 2001: US06273193 (114 worldwide citation)

A dynamically positioned, concentric riser, drilling system comprising a dynamically positioned drilling unit operable to float at least partially above the surface of a body of water, a first, outer, low-pressure, marine riser extending from the drilling unit into the body of water, a tensioning sy ...


5
Leo Donald Maus: Artificial lift system for marine drilling riser. Exxon Production Research Company, Salvatore J Casamassima, May 30, 1978: US04091881 (99 worldwide citation)

An improved offshore drilling method and apparatus are disclosed which are particularly useful in preventing formation fracture caused by excessive hydrostatic pressure of the drilling fluid in a drilling riser. One or more flow lines are used to withdraw drilling fluid from the upper portion of the ...


6
Larry R Forney: Directional drilling method and apparatus. Goldrus Producing Company, Larry R Forney, March 20, 2001: US06202761 (88 worldwide citation)

A directional or horizontal hole may be drilled into a formation by first positioning or orienting a window turning shoe in an original well bore. Once the window turning shoe has been positioned, a window is milled through the casing with a window mill. The window mill is then removed and a guide t ...


7
Roger E Rinaldi: Well casing inserting and well bore drilling method and means. Head Johnson & Stevenson, October 1, 1985: US04544041 (86 worldwide citation)

A well bore casing inserting and drilling method and apparatus comprising the simultaneous drilling and casing setting of an oil and/or gas well bore by supporting a drill bit and actuating motor therefor from the lower end of the well casing whereby the well casing is lowered into the well bore sim ...


8
Carl E Keller: Horizontal drilling method and apparatus. Ray G Wilson, September 8, 1998: US05803666 (85 worldwide citation)

A bore hole support system is formed from a flexible liner that is readily everted within and inverted from a bore hole and forms a bore hole support system during installation of a casing for the bore hole. After a pilot hole is drilled, the pilot hole is traversed with a reamer to form the pilot h ...


9
Paul Fredericks, Donald MacCallum: Rib-mounted logging-while-drilling (LWD) sensors. Baker Hughes Incorporated, Madan Mossman & Sriram P C, May 20, 2003: US06564883 (81 worldwide citation)

A Logging-while-Drilling method and apparatus for obtaining information about a formation uses a plurality of rib sets with pad-mounted sensor on one or more selectively non-rotating sleeves attached to a rotating housing that is part of a drilling assembly. The sensors may be density, neutron, NMR, ...


10
Allan S Richarson, Beat Kuttel: Drilling method and apparatus. Canrig Drilling Technology, Baker Botts L, April 18, 2000: US06050348 (78 worldwide citation)

A method and apparatus for precisely controlling the rotation of a drill string. A sensor monitors the rotation of the drill string and transmits the rotational information to a computer. The computer controls the rotation of the motor driving the drill string and rotates the drill string through an ...