Dowell Schlumberger Incorporated

Chandler Engineering Company, LLC

David B Larson

Erik B Nelson

A reciprocating pump and a capillary viscometer utilizing the same. Preferably, the inventive reciprocating pump is a syringe pump comprising: a cylinder, an actuated piston, and a floating piston. A chamber is created between the actuated piston and floating piston which may be filled with a pressurant to establish the quiescent pressure of the test fluid. The capillary viscometer comprises: a capillary tube wound about a heated mandrel, a differential pressure transducer, and a reciprocating pump. Test fluid is first pumped at a known rate from a first chamber, through the capillary tube, and into a second chamber. The pump is then reversed and the test fluid is then pumped from the second chamber, back through the capillary tube, and back into the first chamber. The process may be repeated in a continuous, reciprocating manner.

Reciprocating drive/pump system and reciprocating capillary viscometer utilizing same

A novel method and device for manipulating ferrofluids for use in cementing wells are disclosed. The cementitious fluids may comprise: (a) a hydraulic cement, (b) finely divided magnetic particles, (c) a binding agent or a surfactant, and (d) a liquid medium. The binding agent or surfactant is present in the compositions in an amount sufficient to render the compositions stable in a magnetic field. When used in cementing wells, the cementitious ferrofluids are implaced in the annulus separating a casing from the formation in a wellbore by conventional techniques and the slurry is subsequently subjected to an activating alternating magnetic field that causes movement of the flurry. The non-cementitious ferrofluids comprise: (a) finely divided magnetic particles, (b) stabilizing agent, and (c) a liquid medium. The movement of the slurry results in a 'scrubbing' action against the surface of the casing and formation surfaces, and a mixing of the slurry which helps displace any residual drilling mud. The net result is better bonding of the cement to the casing and formation.

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Broken Arrow, OK, United States of America

David B Larson