Shell Oil Comapny

Bico Drilling Tools, Inc.

David Allen Barker

Thomas C Forschner

Charles A Lieder

Randall Lee Shearer

Kosay Ibrahim El-Rayes

Lloyd Elbert Funk

A drilling motor provides rotational force within a wellbore and includes a power section within the interior of a housing, a rotor positioned within the power section, and a passage within the rotor. The passage is configured to bypass a portion of the drilling mud from above the power section within the interior of the housing to below the power section within the interior of the housing, and an interior valve at a downstream end of the passage, wherein the valve includes a rupture disc configured to close the passage when the pressure from the drilling mud is less than a threshold pressure, and to rupture to open the passage and pass the drilling mud through the valve when the pressure from the drilling mud is greater than the threshold pressure.

Drilling motor interior valve

By controlling one or more properties of a gasoline-oxygenate blend, a gasoline-oxygenate blend may be blended to contain at least one alcohol that exhibits acceptable properties and characteristics. This blend and the preferred method of preparing this blend includes an alcohol, most preferably ethanol, to reduce or eliminate the introduction of MTBE while offering acceptable properties such as volatility and temperature while effectively reducing pollutant emissions.

Gasoline-oxygenate blend and method of producing the same

The present invention is directed to tracer-containing chemical compositions and to the use of at least one perfluorocarbon tracer in such compositions to provide a means of identifying and quantitatively analyzing such compositions.

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Cypress, TX, United States of America

David Allen Barker