04120360 is referenced by 14 patents and cites 4 patents.

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.

Title
Treating wells to mitigate flow-after-cementing
Application Number
5/796912
Publication Number
4120360
Application Date
May 16, 1977
Publication Date
October 17, 1978
Inventor
Joseph U Messenger
Dallas
TX, US
Agent
Henry L Ehrlich
C A Huggett
Assignee
Mobil Oil Corporation
NY, US
IPC
E21B 33/14
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