Repair of microannuli and cement sheath

Details Repair of microannuli and cement sheath Repair of microannuli and cement sheath

1991-01-08

1992-07-07

Suchfield, George A.

Wells

Processes

Repairing object in well

166281, 166292, 166297, E21B 3313

Patent

active

051274736

ABSTRACT:
This invention relates to a method of repairing holes, channels, voids and microannuli in a cement sheath situated in the annular space between a casing and the wall of a wellbore penetrating a subterranean earth formation, which method involves the use of a hydraulic cement consisting of discrete particles having a particle size not greater than about 30 microns. The cement, which is utilized in a water slurry, has a low density, good thixotropic properties and, in one embodiment, expansive characteristics.

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