Wells – Processes – Placing or shifting well part
Patent
1987-09-04
1989-02-07
Suchfield, George A.
Wells
Processes
Placing or shifting well part
166 665, 166285, E21B 3314, E21B 4300
Patent
active
048025348
ABSTRACT:
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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Larson David B.
Nelson Erik B.
Dowell Schlumberger Incorporated
Littlefield Stephen A.
Suchfield George A.
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