04387769 is referenced by 219 patents and cites 10 patents.

The present invention relates generally to the composition and method for reducing the permeability of subterranean formations penetrated by a wellbore. The composition of the present invention comprises a wellbore fluid having dispersed therein a fluid loss control agent comprising a polyester polymer which is substantially insoluble in the wellbore fluid. The polymer degrades in the presence of water at an elevated temperature to form small molecules which are soluble in a fluid in the subterranean formation. The method of the present invention comprises reducing the permeability of subterranean formations penetrated by a wellbore by placing the composition of the present invention down the wellbore.

Title
Method for reducing the permeability of subterranean formations
Application Number
6/291200
Publication Number
4387769
Application Date
August 10, 1981
Publication Date
June 14, 1983
Inventor
Michael M Epstein
Columbus
OH, US
Richard G Sinclair
Columbus
OH, US
Claude E Cooke Jr
Houston
TX, US
Steven R Erbstoesser
Missouri City
TX, US
Agent
E Eugene Thigpen
K C Johnson
Assignee
Exxon Production Research Co
TX, US
IPC
E21B 43/22
E21B 33/138
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