1
Jack E Bridges: Electrical heating of mineral well deposits using downhole impedance transformation networks. Uentech Corporation, Dorn McEachran Jambor & Keating, April 15, 1997: US05621844 (315 worldwide citation)

A.C. electrical heating system for heating a fluid reservoir (deposit) in the vicinity of a mineral fluid well, usually an oil well, utilizes A.C. electrical power in a range of 25 Hz to 30 KHz. The well has a borehole extending down through an overburden and into a subterranean fluid (oil) reservoi ...


2
Gordon O Cates, Ronald M Bass, Kenneth J Schmitt: Method and apparatus for pumping wells. Production Technologies International, M H Gay, May 4, 1993: US05207273 (282 worldwide citation)

A method and apparatus for producing wells in which the tubing and casing are used as electrical conduits for a centrifugal pump in the well and single phase A. C. or D. C. current is supplied to the well and converted to three phase current at the pump motor.


3
Recovering combustible gases from underground deposits of coal or bituminous shale. Iniex, November 3, 1976: GB1454324-A (282 worldwide citation)

1454324 Combustible gases INSTITUT NATIONAL DES INDUSTRIES EXTRACTIVES 11 Oct 1974 [14 Aug 1974] 44065/74 Heading C5E Combustible gases are recovered from an underground deposit of coal or bituminous shale with overlying rock by thermally gasifying the coal or shale in a lower part N 1 , Fig. 1, of ...


4
An improved method of treating shale and recovering oil therefrom. Wilson Woods Hoover, Thomas Ellis Brown, January 13, 1921: GB156396-A (274 worldwide citation)

156,396. Hoover, W. W., and Brown, T.E. Dec. 10, 1919. Fire-setting.-In working oil shales in situ, the zone undergoing treatment is fractured and thereby rendered permeable to a treating-medium. For this purpose, a series of wells a, a are bored and charges are exploded within the zone A, whereupon ...


5
Beard Thomas N: Method of producing hydrocarbons from an oil shale formation. Shell Oil Company, September 18, 1973: US3759574 (268 worldwide citation)

A method of producing hydrocarbons and optionally water-soluble minerals from a subterranean oil shale formation containing zone(s) of water-soluble minerals, by penetrating said formation with at least one borehole and leaching or dissolving the water-soluble minerals from the formation with a solv ...


6
Jim B Surjaatmadja, Timothy W Helton, Danny G Porter: Well completions with expandable casing portions. Halliburton Company, Stephen R Christian, Neal R Kennedy, March 14, 1995: US05396957 (264 worldwide citation)

Expandable casing portions are provided, such as casing slip joints or expansion joints, on opposite sides of a fracture initiation location to accommodate casing and formation movement during fracturing of a well. The fracture initiation location provided by forming openings through the well casing ...


7
Williams Frank Archer: Improvements in or relating to the underground gasification of coal. Nat Res Dev, June 18, 1952: GB674082-A (259 worldwide citation)

674,082. Destructive distillation in situ. NATIONAL RESEARCH DEVELOPMENT CORPORATION. July 31, 1950 [June 15, 1949], No. 15989/49. Drawings to Specification. Class 55 (ii). In a system for the underground gasification of coal in which a stream of gasifying medium such as air, air mixed with oxygen, ...


8
Jim B Surjaatmadja, Richard L Giroux, Timothy W Helton: Well completions with expandable casing portions. Halliburton Company, Stephen R Christian, Neal R Kennedy, July 5, 1994: US05325923 (257 worldwide citation)

Expandable casing portions are provided, such as casing slip joints or expansion joints, on opposite sides of a fracture initiation location to accommodate casing and formation movement during fracturing of a well. The fracture initiation location may be provided by forming openings through the well ...


9
Kerry D Savage: Method of heating an oil shale formation. Texaco, Robert A Kulason, Ronald G Gillespie, June 25, 1985: US04524826 (255 worldwide citation)

A method of heating an oil shale formation to produce shale oil includes radiating RF energy into the oil shale formation for a predetermined first time interval from a first borehole which penetrates said oil shale formation. Shale oil is produced when available during said first time interval from ...


10
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 ...