Continental Oil Company

Conoco Inc.

Dell Conley

Howard H Ferrell

Burton M Casad

Olaf M Stokke

Robert L Coffee

Jaime A Lescarboura

Robert J Cavanaugh

Filterability of aqueous solutions of polymers employed to thicken waterfloods such as biopolymers (e.g. heteropolysaccharides) is improved by addition of a surfactant (e.g. a sulfated alkoxylated alcohol). Filterability is further enhanced by addition of an ethoxylated alcohol surfactant and/or an alcohol.

Polymer flood filtration improvement

A sidestream of injection liquid taken downstream of a filter is passed through a monitoring filter of appropriate pore size. Pressure drop over the monitoring filter is determined and a regeneration cycle for the main filter is triggered in response to differential pressure (.DELTA.P) over a preset value, which corresponds to deterioration in filtrate quality.

Method and apparatus for automatic control of filtrate quality

Wireline apparatus and method for measuring pressure downhole in well tubing comprising a main plug body which seats in a seating nipple forming part of the tubing, a pressure gauge in communication with the tubing below the main plug body, and means for equalizing the tubing pressure above and below the seated main plug body so that the apparatus may be removed from the well.

Subsurface transient pressure testing apparatus and method of use thereof

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Ponca City, OK, United States of America

Dell Conley