Harold J Vinegar, Pierre N Tutunjian: Method for determining preselected properties of a crude oil. Shell Oil Company, April 26, 1994: US05306640 (235 worldwide citation)

Methods are provided for using Nuclear Magnetic Resonance (NMR) spectroscopy to measure the bulk volume of oil and water in the polyurethane liner of sponge core. The method is accurate, rapid, and non-destructive. It provides information simultaneously in oil composition and viscosity.

Ronald E Brown, Robert J Hogan, Daniel M Coombs, Simon G Kukes: Process for demetallizing and desulfurizing heavy crude oil. Phillips Petroleum Company, Laney Dougherty Hessin & Beavers, December 5, 1989: US04885080 (221 worldwide citation)

A heavy crude oil is fractionated into at least three liquid fractions which include a distillate fraction boiling in the 400.degree. F.-650.degree. F. range and a 650.degree. F.+ boiling range residuum. The distillate cut is hydrodesulfurized and the residuum is hydrodemetallized. The cuts thus hyd ...

John C Todd: Method and apparatus for producing viscous or waxy crude oils. Hubbard Thurman Turner & Tucker, May 8, 1984: US04446917 (170 worldwide citation)

Tubing which contains crude oil being moved to the surface is surrounded by concentric sections of pipe at various depths along portions of the tubing. Said concentric sections of pipe contain a porous media incorporating an oxidizing catalyst in the annulus between said pipe and the tubing. A fuel ...

A Herbert Harvey, John P Govier: Petroleum production method. Senniger Powers Leavitt and Roedel, October 21, 1980: US04228853 (164 worldwide citation)

A method for electrical resistance heating of select portions of a natural underground reservoir, in a geologic formation, that contains both crude oil and water. Through selective resistance heating, oil viscosity is reduced in the select portion of the reservoir. Thus, portions which would not nor ...

Laurence O Stine: In situ conversion of hydrocarbonaceous oil. UOP, James R Hoatson Jr, John G Cutts Jr, William H Page II, May 15, 1984: US04448251 (157 worldwide citation)

A method for the in situ conversion and recovery of heavy hydrocarbonaceous crude oil containing indigenous trace metal from two adjacent non-communicating hydrocarbon reservoirs which are alternately pressured and recovered which method comprises: (a) heating the heavy hydrocarbonaceous crude oil i ...

Ian David Farquhar Davidson, Andrew George Yule: Gas and oil production. Scotoil Group, Heslin Rothenberg Farley & Mesiti P C, October 19, 2004: US06805194 (153 worldwide citation)

A process for in situ gasification of mineral oil in a subterranean formation comprises running a tool having a controllable thermal device therein from a surface production facility down to the subterranean formation, bringing said tool into operational proximity with the mineral oil in said subter ...

Shang Chou, Curtis B Campbell: Oil recovery method for waxy crude oil using alkylaryl sulfonate surfactants derived from alpha-olefins and the alpha-olefin compositions. Chevron U, Chevron Chemical Company, A Stephen Zavell, August 7, 2001: US06269881 (127 worldwide citation)

An oil recovery process is disclosed which uses a particular class of alkylaryl sulfonate surfactants. The surfactants are derived from an alpha-olefin stream having a broad distribution of even carbon numbers ranging from 12 to 58. The olefin stream is reacted with aromatic feedstock, such as benze ...

Kambiz A Safinya, Roger W McBride: System and method for communicating signals in a cased borehole having tubing. Schlumberger Technology, Keith Smith, Peter Lee, Martin Novack, June 13, 1989: US04839644 (121 worldwide citation)

A system and method are disclosed for wireless two-way communication in a cased borehole having tubing extending therethrough. A downhole communications subsystem is mounted on the tubing. The downhole subsystem includes a downhole antenna for coupling electromagnetic energy in a TEM mode to and/or ...

Raymond S Kasevich: Method and apparatus for in-situ radiofrequency assisted gravity drainage of oil (RAGD). KSN Energies, Dorsey & Whitney, October 28, 2008: US07441597 (121 worldwide citation)

The present invention relates generally to the use of radiofrequency energy to heat heavy crude oil or both heavy crude oil and subsurface water in situ, thereby enhancing the recovery and handling of such oil. The present invention further relates to methods for applying radiofrequency energy to he ...

Wolfgang Littmann: Method of increasing the yield of hydrocarbons from a subterranean formation. April 2, 1985: US04508170 (113 worldwide citation)

Heavy crude oil is recovered from a subterranean formation by a process comprising