91
Daryl R Boomer, Russell E Boyer: Pressure-controlled valve with small hold-up volume. Chevron Research Company, Edward J Keeling, G W Wasson, January 12, 1982: US04310140 (10 worldwide citation)

A pressure-controlled valve comprising an elastic-walled conductor, such as a tube, with a flow-obstructing body within the conductor. Fluid flow through the conductor is controlled by expanding the elastic wall away from the flow-obstructing body to provide fluid flow paths and by contracting the e ...


92
Allan Hamberg, Elmer L Thomas, Henry T Carruth Jr, Mitchell F Peterson: Method and apparatus for well casing inspection. Chevron Research Company, S R LaPaglia, Edward J Keeling, February 14, 1989: US04804906 (10 worldwide citation)

An oil and gas well casing inspection tool is disclosed. The casing inspection tool comprises a body; inner and outer contact rollers extending from the body; means for generating a current between the outer contacts; and means for measuring a potential difference between the inner contacts. To enha ...


93
Donald F Winterstein: Method of layer stripping to determine fault plane stress build-up. Chevron Research and Technology Company, Edward J Keeling, Matt W Carson, October 22, 1991: US05060204 (10 worldwide citation)

A method for analyzing seismic shear wave data, using a layer stripping technique, to determine fault plane stress build-up is disclosed. Polarization directions of shear wave data, from either a vertical seismic profile or from surface reflection data, are analyzed, and time lags between fast and s ...


94
Donald F Winterstein: Method of geophysical exploration by analyzing shear-wave polarization directions. Chevron Research and Technology Company, Edward J Keeling, Matt W Carson, August 25, 1992: US05142501 (10 worldwide citation)

A method for geophysical exploration by analyzing shear-wave polarization directions relative to a fixed coordinate frame is disclosed, for either vertical seismic profile data or surface seismic reflection data. Energy in a selected time window of two off-diagonal components is determined, and the ...


95
Irving F Womack II, Mitchell F Peterson: System for monitoring injection water quality using filtration, pressure regulation and mass measuring. Chevron Research Company, Edward J Keeling, March 3, 1992: US05092988 (10 worldwide citation)

An apparatus for testing water quality for subsurface injection that provides for samples of infinite volume to be passed over a membrane filter at a constant pressure. The apparatus uses a positive displacement pump drawing suction on the water source and discharging to a membrane filter. Between t ...


96
Robert J S Brown: Computer-controlled, portable pulsed NMR instrument and method of use wherein the times of RF interrogation are distributed over at least a cycle at the nuclear magnetization precessional frequency. Chevron Research Company, H D Messner, Edward J Keeling, October 25, 1983: US04412179 (10 worldwide citation)

In accordance with the present invention, fluid-flow properties of a rock sample based on NMR response of the hydrogen nuclei of interstitial fluids within the pore space of such sample, can be swiftly and accurately achieved using a computer-controlled, portable NMR instrument. The inherent instrum ...


97
Donald J Anderson: Method of assisting surface lift of heated subsurface viscous petroleum. Chevron Research Company, G W Wasson, Lewis S Gruber, Edward J Keeling, November 6, 1984: US04480695 (10 worldwide citation)

A method and apparatus is described for producing viscous petroleum from a subsurface formation. The apparatus includes a generally horizontal cased well through the subsurface formation with injection and production tubings within the well. The casing is perforated and the inner tubings carry a mov ...


98
John M Powell: Apparatus and method for measuring reservoir pressure changes. Chevron Research Company, Edward J Keeling, Ernest A Schaal, September 18, 1990: US04957001 (10 worldwide citation)

An apparatus for the accurate measurement of pressure changes has a reference accumulator and a differential pressure transducer. The reference accumulator stores a pressure representative of the environment being measured. The differential pressure transducer measures the difference between the ref ...


99
Don D Thompson, Robert J S Brown, Richard J Runge: Method for interpreting seismic records to yield indications of gas/oil in an earth formation such as a sandstone, limestone, or dolostone. Chevron Research Company, H D Messner, Edward J Keeling, February 22, 1983: US04375090 (10 worldwide citation)

The present invention indicates that acoustic characteristics associated with gas/oil-containing strata such as a sandstone, limestone or dolostone, including reflectivity coefficients can be normalized (and favorably compared) with similar characteristics calculated and displayed by means of a mach ...


100
Francis Muir: Chevron Research Company, H D Messner, Edward J Keeling, August 19, 1986: US04607353 (9 worldwide citation)

The disclosed invention is a method of seismic exploration using non-impulsive vibratory sources activated by filtered stationary, Gaussian codes. The method adds a distortion-free quality to the full-waveform seismic records.