1
David J Watanabe: Method for selectively acidizing the less permeable zones of a high temperature subterranean formation. Union Oil Company of California, Dean Sandford, Daniel R Farrell, April 14, 1981: US04261421 (68 worldwide citation)

The less permeable zones of subterranean formations having temperatures above about 250.degree. F. are acidized by selectively plugging the more permeable zones with acid-soluble particulate diverting agents and then injecting a substantially anhydrous acid precursor into the formation. The acid pre ...


2
Harry D Outmans: Geothermal power plant. Union Oil Company of California, Dean Sandford, Daniel R Farrell, May 6, 1980: US04201060 (41 worldwide citation)

A method for generating electricity wherein a geothermal fluid is produced from a moderate temperature hydrothermal formation and is used to supply sufficient sensible heat to preheat a working fluid, thereby cooling the geothermal fluid. The cool geothermal fluid is preferably reinjected into the h ...


3
Donald D Engle Jr, Michael E Utt: Lateral support members for a tension leg platform. Union Oil Company of California, Richard C Hartman, Dean Sandford, Daniel R Farrell, September 19, 1978: US04114393 (34 worldwide citation)

Apparatus and method for mooring a tension leg platform at an offshore location wherein the tensioned cables of the platform legs are laterally supported by a plurality of rigid, fixed-dimensioned support members which interconnect the legs and are vertically spaced at predetermined positions along ...


4
David J Watanabe: Method for acidizing high temperature subterranean formations. Union Oil Company of California, Dean Sandford, Daniel R Farrell, May 19, 1981: US04267887 (28 worldwide citation)

Subterranean formations having temperatures above about 250.degree. F. are acidized by introducing a substantially anhydrous foamed treating fluid through a well and into the formation. The treating fluid contains a gas, a nonionic substantially hydrophobic foaming agent and an acid precursor which ...


5
Michael L Barnes, Olin D Whitescarver: Wellhead apparatus. Union Oil Company of California, Richard C Hartman, Dean Sandford, Daniel R Farrell, August 15, 1978: US04106562 (27 worldwide citation)

Wellhead flow control apparatus for controlling the flow of fluids from a well producing fluids and debris including a novel device for separating and accumulating the debris. The device comprises an outer shell defining an enclosed accumulation chamber, a perforated outlet conduit communicating wit ...


6
William E Showalter: Process for recovery of mineral values from underground formations. Union Oil Company of California, Richard C Hartman, Dean Sandford, Daniel R Farrell, August 8, 1978: US04105253 (27 worldwide citation)

Carbon dioxide is admixed with water to form a carbonic acid solution for use as a leaching solution for extraction of uranium by solution mining. An oxidizing agent is also present in the solution.


7
Gary K Hackett: Seismic exploration method. Union Oil Company of California, Dean Sandford, Daniel R Farrell, September 16, 1980: US04223399 (26 worldwide citation)

A seismic exploration method in which a coded energy signal is generated and transmitted into the earth, the seismic energy reflected from within the earth is sensed and sampled to form a raw trace, the raw trace is crosscorrelated with a record of the coded energy signal, and a predictive operator ...


8
Donald M Fenton: Method for removing hydrogen sulfide from gas streams. Union Oil Company of California, Dean Sandford, Daniel R Farrell, January 6, 1981: US04243648 (25 worldwide citation)

A hydrogen sulfide removal and conversion method in which a hydrogen sulfide-containing gas stream is contacted with a regenerable washing solution capable of absorbing the hydrogen sulfide and converting the hydrogen sulfide to hydrophobic elemental sulfur particles. After oxidative regeneration of ...


9
George G Bernard, LeRoy W Holm: Enhanced oil recovery process. Union Oil Company of California, Richard C Hartman, Dean Sandford, Daniel R Farrell, September 12, 1978: US04113011 (24 worldwide citation)

An enhanced oil recovery process employing an aqueous alkyl polyethylene oxide sulfate solution and a carbon dioxide displacement fluid at injection pressures above about 1,500 p.s.i. The aqueous solution of an alkyl polyethylene oxide sulfate having 8 or 9 carbon atoms in the alkyl group and betwee ...


10
Raymond N Fleck, Harvey Hennig: Method of producing mechanical energy from geothermal brine. Union Oil Company of California, Richard C Hartman, Dean Sandford, Daniel R Farrell, January 2, 1979: US04132075 (22 worldwide citation)

A method for producing mechanical energy from geothermal brine in which a heat transfer fluid (HTF) is heated by direct contact with the hot geothermal brine in cocurrent flow through a series of flash stages which are maintained at successively lower pressures so that the HTF is vaporized in each s ...