1
Robert L Waters, George F Roberts, Philip H Walters, Howard C Clark, Don D Fitzgerald, Otis V Stelly II: Downhole combination tool. Magrange, Cox & Smith, November 12, 1991: US05064006 (286 worldwide citation)

A directional drilling downhole steering and survey tool for detecting ferromagnetic bodies from an off vertical borehole, transmitting the signals from the downhole sensors to surface equipment while drilling, and for calculation of the range and direction to the detected ferromagnetic body for the ...


2
Gustave L Hoehn Jr: Method for directionally drilling a first well to intersect a second well. Mobil Oil Corporation, Alexander J McKillop, Michael G Gilman, Charles J Speciale, July 10, 1984: US04458767 (263 worldwide citation)

A first well is directionally drilled to intersect a second well. The second well is magnetized along its well casing to produce a magnetic anomaly which is sensed by a magnetometer located in the first. The drilling of the first well is redirected in accordance with the magnitude of the sensed anom ...


3
Michel Gondouin: Downhole equipment, tools and assembly procedures for the drilling, tie-in and completion of vertical cased oil wells connected to liner-equipped multiple drainholes. S Cal Research, October 31, 1995: US05462120 (251 worldwide citation)

Single horizontal wells drilled through heterogeneous reservoirs are capable of greater oil productivity than vertical wells, often with lower produced GOR and WOR. Multiple drainholes tied-in to a vertical cased well are even more beneficial. Completion of such drainholes in many sandy reservoirs m ...


4
Bob J Patton: Surveying system and method for locating target subterranean bodies. Patton Consulting, April 14, 1992: US05103920 (244 worldwide citation)

An improved system for use in drilling a relief well to intersect a target blowout well. A probable location distribution is used to survey the location of the candidate relief wells and the blowout well. Through the use of the relative probable location distribution, the integral probabilities of f ...


5
Alexandre G E Kosmala, Attilio C Pisoni, Dimitrios K Pirovolou, Spyro J Kotsonis: Actively controlled rotary steerable system and method for drilling wells. Schlumberger Technology Corporation, James L Jackson, Wayne I Kanak, Steven L Christian, July 25, 2000: US06092610 (236 worldwide citation)

An actively controlled rotary steerable drilling system for directional drilling of wells having a tool collar rotated by a drill string during well drilling. A bit shaft has an upper portion within the tool collar and a lower end extending from the collar and supporting a drill bit. The bit shaft i ...


6
Lance D Underwood, Harold D Johnson, Charles H Dewey: Method and apparatus for automatic closed loop drilling system. Halliburton Company, Michael F Heim, July 26, 1994: US05332048 (234 worldwide citation)

An automatic closed loop drilling system is disclosed for providing automatic directional drilling capabilities in a bottomhole assembly. The drilling system includes at least one adjustable stabilizer that varies in response to formational and drilling conditions encountered downhole. A microcontro ...


7
John Howard Striegler, Eddie Paul Howell: Production of bitumen from tar sands. Atlantic Richfield Company, Ronnie D Wilson, October 19, 1976: US03986557 (220 worldwide citation)

A method of producing bitumen from a subterranean tar sand formation characterized by the following muti-step process. First, a continuous wellbore having a second section thereof contained within the formation and a first and a third section extending said second section to the earth's surface is f ...


8
Peter Veenstra, Eric Pierre de Rouffignac, John Michael Karanikas, Harold J Vinegar, Scott Lee Wellington: Methods and systems for heating a hydrocarbon containing formation in situ with an opening contacting the earths surface at two locations. Shell Oil Company, June 20, 2006: US07063145 (214 worldwide citation)

In an embodiment, a method for heating a hydrocarbon containing formation may include providing heat from one or more heaters to an opening in the formation. A first end of the opening may contact the earth's surface at a first location and a second end of the opening may contact the earth's surface ...


9
Arthur F Kuckes: Method for near field electromagnetic proximity determination for guidance of a borehole drill. Vector Magnetics, Jones Tullar & Cooper PC, July 13, 1999: US05923170 (211 worldwide citation)

A method and apparatus for precise measurement of the distance and direction from a magnetic field sensor to a nearby magnetic field source includes an elongated iron core solenoid driven by a repetitive, nonsinusoidal current source. In the near field the solenoid has two spaced, temporally varying ...


10
Donald L Rider: Horizontal well system. Scioto County Regional Water District &num 1, Wood Herron & Evans L, July 23, 2002: US06422318 (196 worldwide citation)

A horizontal well system, in accordance with the principles of the invention, includes a porous casing member having an interior space, a first end, and a second end, with at least a portion of the porous casing member being positioned substantially horizontally within an aquifer. This horizontal we ...