1
James E Tackett Jr: In situ reversible crosslinked polymer gel used in hydrocarbon recovery applications. Marathon Oil Company, Jack L Hummel, Jack E Ebel, January 21, 1992: US05082056 (147 worldwide citation)

Reversible crosslinked polymer gels are prepared by adding a degelling agent precursor to a gelation solution during initial preparation. The precursor is integrated into the resulting gel and undergoes hydrolysis to transform into an active degelling agent which reverses the gel. The process has sp ...


2
James E Beitel, Charles R Bruce, Gary R Cook, Charles F Mosier Jr, Edward L Sartore: Computer terminal security system. Marathon Oil Company, Jack L Hummel, February 7, 1984: US04430728 (143 worldwide citation)

The invention provides a system for securing the access of a remote computer terminal (130) to a centrally located host computer (300). The system includes a first security circuit (200) interconnected with a calling telephone (100), a calling modem (110), and the remote computer terminal (130) at t ...


3
Robert D Sydansk: Hydraulic fracturing process using a polymer gel. Marathon Oil Company, Jack L Hummel, Rodney F Brown, October 25, 1988: US04779680 (114 worldwide citation)

A subterranean hydrocarbon-bearing formation is hydraulically fractured using a crosslinked polymer gel as a fracturing fluid. The gel comprises a high molecular weight, water-soluble, carboxylate-containing polymer and a chromic carboxylate complex crosslinking agent. The gel components are premixe ...


4
Victor D Allred: Process for suppressing carbonate decomposition in vapor phase water retorting. Marathon Oil Company, Jack L Hummel, January 6, 1981: US04243511 (106 worldwide citation)

Oil shale containing relatively large quantities of alkaline carbonate minerals is retorted utilizing superheated water vapor at temperatures of from about 425.degree. C. to about 510.degree. C. Retorting with a sufficient carbon dioxide partial pressure effectively suppresses decomposition of the a ...


5
LaVaun S Merrill Jr, Larry D Wheaton: Oil shale retorting with steam and produced gas. Marathon Oil Company, Jack L Hummel, Jack E Ebel, August 20, 1991: US05041210 (104 worldwide citation)

A process for retorting oil shale in a vertical retort. Recycle gas containing steam and produced gas is separated from the retort off-gas and used to heat the oil shale. The steam is present in amount by volume of the recycle gas of at least 40% and preferably 70%. The minimum particle size of the ...


6
Robert D Sydansk, Perry A Argabright: Conformance improvement in a subterranean hydrocarbon-bearing formation using a polymer gel. Marathon Oil Company, Jack L Hummel, Rodney F Brown, August 4, 1987: US04683949 (102 worldwide citation)

Conformance improvement is achieved in a subterranean hydrocarbon-bearing formation using a gel comprised of a high molecular weight water-soluble acrylamide polymer, a chromium III/carboxylate complex capable of crosslinking the polymer and an aqueous solvent. The gel components are combined at the ...


7
Donald E Schroeder Jr, Bradley D Hutchison: Staged screen assembly for gravel packing. Marathon Oil Company, Jack L Hummel, Jack E Ebel, June 12, 1990: US04932474 (69 worldwide citation)

A gravel packing process employs a staged screen assembly to prevent sand and other fine particles entrained in the produced hydrocarbon fluids from entering the production tubing and related equipment. The staged screen assembly is provided with a base pipe having rupture disks in its sidewall. The ...


8
John B Hayes, Gerald W Haws, William B Gogarty: Water-in-oil microemulsion drilling fluids. Marathon Oil Company, Joseph C Herring, Jack L Hummel, March 15, 1977: US04012329 (63 worldwide citation)

An oil-external microemulsion drilling fluid having a wide range of tolerance for salinity, having good gel strength and low fluid loss characteristics, and also obtained by mixing about 1% to about 30% of a sodium petroleum sulfonate having an average equivalent weight within the range of about 350 ...


9
Gary J Collins: Assembly and process for drilling and completing multiple wells. Marathon Oil Company, Jack L Hummel, Jack E Ebel, March 9, 1999: US05878815 (61 worldwide citation)

An apparatus and process are provided for drilling and completing multiple subterranean wells from a template which is secured within a cased well bore extending to the surface. An orienting cam having a bore therethrough is positioned above the template such that the bore through the orienting cam ...


10
Philip M Snider, Joseph P Haney, Robert L Haney, David S Wesson, David A Cuthill: Apparatus and method for perforating and stimulating a subterranean formation. Marathon Oil Company, Jack L Hummel, Jack E Ebel, July 7, 1998: US05775426 (58 worldwide citation)

A method and apparatus for perforating and stimulating a subterranean formation which is penetrated by a well bore having casing positioned therein so as to establish fluid communication between the formation and the well bore. A shell, sheath or sleeve of propellant material is positioned so as to ...