Conoco Inc.

David A Strah

Donald L Whitfill

Nobuo Morita

Giin-Fa Fuh

Ardis L Anderson

Fracture initiation and propagation during drilling or running casing in a well are prevented or inhibited by including an effective amount of a specially sized solid particulate loss prevention material in the well fluid prior to encountering formation breakdown in a susceptible zone.

Method for inhibiting the initiation and propagation of formation

Fracture initiation and propagation during drilling are prevented or inhibited by including an effective amount of a specially sized solid particulate loss prevention material in the drilling fluid prior to encountering formation breakdown in a susceptible zone.

A process of removing methanol from a mixed stream comprising methanol and at least one hydrocarbon and utilizing the hydrocarbon as feed for an acid catalyzed alkylation unit which produces a spent acid stream is provided. The process is comprised of the steps of contacting the mixed stream with at least a portion of the alkylation unit spent acid stream whereby the methanol is reacted therewith and an aqueous reaction mixture is formed, separating the aqueous reaction mixture from the hydrocarbon and conducting the hydrocarbon to the alkylation unit.

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Ponca City, OK, United States of America

David A Strah