1
Donald C Van Slyke: Solvent soaps and methods employing same. Union Oil Company of California dba UNOCAL, Gregory F Wirzbicki, Shlomo R Frieman, March 3, 1998: US05723423 (142 worldwide citation)

Compositions comprising (a) a surfactant and (b) a diluent oil are employed in oil-based drilling fluids and processes for cleaning oil-contaminated substrates (e.g., oil-contaminated animals, drill cuttings) as well as in processes for cementing well casings, enhanced oil recovery, and lifting oil ...


2
Burton B Sandiford, Hoai T Dovan, Richard D Hutchins: High temperature stable gels. Union Oil Company of California, Gregory F Wirzbicki, Shlomo R Frieman, September 21, 1993: US05246073 (89 worldwide citation)

Gels stable in a subterranean formation at a temperature greater than about 175.degree. F. are formed using, inter alia, a stabilizing agent (e.g., a buffer having a buffering capacity at a pH of at least about 8 and/or a chelating agent).


3
Hutchins Richard D, Hoai T Dovan: Method for reducing water production from wells. Union Oil Company of California, Gregory F Wirzbicki, Shlomo R Frieman, November 10, 1992: US05161615 (68 worldwide citation)

Water production from a wellbore is reduced by sequentially or simultaneously injecting (a) a hydrophilic polymer-containing organic carrier fluid and (b) a crosslinking agent-containing fluid into at least a portion of a subterranean formation. The cross-linking agent reacts with the polymer in the ...


4
Richard D Hutchins, Burton B Sandiford, Hoai T Dovan: Foamed gels having selective permeability. Union Oil Company of California, Gregory F Wirzbicki, Shlomo R Frieman, April 20, 1993: US05203834 (64 worldwide citation)

Pathway-containing foamed gels enhance the recovery of the nonaqueous fluids from subterranean formations by selectively reducing the flow of aqueous fluids with respect to the flow of nonaqueous fluids.


5
Donald C Van Slyke: White mineral oil-based drilling fluid. Union Oil Company of California, Gregory F Wirzbicki, Shlomo R Frieman, August 2, 1994: US05333698 (58 worldwide citation)

A wellbore fluid (e.g., a drilling, completion, packer, or fracturing fluid) comprises (a) at least one additive selected from the group consisting of emulsifiers, wetting agents, viscosifiers, weighting agents, fluid loss control agents, proppants for use in hydraulically fracturing subterranean fo ...


6
Hoai T Dovan: Drilling mud disposal technique. Union Oil Company of California, Gregory F Wirzbicki, Shlomo R Frieman, May 25, 1993: US05213446 (52 worldwide citation)

Drilling mud is economically disposed of in an environmentally sound manner by mixing the mud with a crosslinkable polymer and a crosslinking agent to form a composition that solidifies at a predetermined time. The composition is injected into a subterranean formation through an abandoned well and, ...


7
Donald C Van Slyke: Separation of oils from solids. Union Oil Company of California, Gregory F Wirzbicki, Shlomo R Frieman, August 10, 1993: US05234577 (45 worldwide citation)

Drill cuttings are cleaned of oil-based drilling mud and oil using a cleansing agent, such as a C6-C10 carboxylic acid, that is preferentially oil soluble at one pH and preferentially water soluble at another pH. The oily cuttings are treated with the carboxylic acid and then washed with an aqueous, ...


8
Donald C Van Slyke: Non-toxic, inexpensive synthetic drilling fluid. Union Oil Company of California, Gregory F Wirzbicki, Shlomo R Frieman, June 3, 1997: US05635457 (44 worldwide citation)

A non-toxic, inexpensive synthetic fluid for use in wellbore fluids (e.g., drilling fluids) is selected from the group consisting of (A) fluids having (I) a pour point greater than about -30.degree. C. (-22.degree. F.) and (II) a cetane index greater than 50, and comprising (i) at least about 95 wei ...


9
James D Mercer, Laura L Nesbit: Oil-base drilling fluid comprising branched chain paraffins such as the dimer of 1-decene. Union Oil Company of California, Gregory F Wirzbicki, Howard R Lambert, Shlomo R Frieman, March 17, 1992: US05096883 (42 worldwide citation)

A non-toxic drilling fluid (drilling mud), for use in rotary-type well-drilling operations, comprises a non-toxic base-oil consisting essentially of branched-chain paraffins which may or may not contain ester functionalities, the base-oil having: (i) between about 16 and about 40 atoms per molecule, ...


10
Richard D Hutchins, Dennis L Saunders: Tracer chemicals for use in monitoring subterranean fluids. Union Oil Company of California, Gregory F Wirzbicki, Shlomo R Frieman, September 21, 1993: US05246860 (42 worldwide citation)

Organic tracers are employed to monitor the movement of subterranean fluids. These organic tracers are (a) stable at elevated temperatures, (b) capable of being detected at low concentrations, and/or (c) not adversely affected by the make-up of at least one subterranean formation. In addition, a plu ...