Treating wells to mitigate flow-after-cementing

Details Treating wells to mitigate flow-after-cementing Treating wells to mitigate flow-after-cementing

1977-05-16

1978-10-17

Novosad, Stephen J.

Wells

Processes

Cementing, plugging or consolidating

106 85, E21B 3314

Patent

active

041203607

ABSTRACT:
This specification discloses a method of treating a well drilled into the earth. In carrying out this method there is formed a lightweight thixotropic cement slurry that is comprised of a low density calcined shale cement, attapulgite and water, in ratios to provide a pumpable slurry that has zero water separation. This lightweight thixotropic cement slurry having zero water separation is placed in a well and allowed to set.

REFERENCES:
patent: 2705050 (1955-03-01), Davis et al.
patent: 3197317 (1965-07-01), Patchen
patent: 3581825 (1971-06-01), Messenger
Christian et al., "Gas Leakage in Primary Cementing--A Field Study and Laboratory Investigation," Journal of Petroleum Tech., 11-1976, pp. 1361-1369.
Parker, "Specialty Cements Can Solve Special Problems," The Oil and Gas Journal, Feb. 28, 1977, pp. 128-131.

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