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Steven R Erbstoesser, Claude E Cooke Jr, Richard G Sinclair, Michael M Epstein: Method for reducing the permeability of subterranean formations. Exxon Production Research Co, K C Johnson, E Eugene Thigpen, June 14, 1983: US04387769 (219 worldwide citation)

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 poly ...


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Steven R Erbstoesser, Claude E Cooke Jr, Richard G Sinclair, Michael M Epstein: Use of degradable ball sealers to seal casing perforations in well treatment fluid diversion. Exxon Production Research Company, Hubert E Cox, Gary D Lawson, January 5, 1988: US04716964 (218 worldwide citation)

Plugging perforations in casing in a wellbore penetrating a subterranean formation using degradale ball sealers. The ball sealer used is composed of a polyester polymer which is substantially insoluble in the wellbore fluid. The polymer degrades in the presence of water at an elevated temperature to ...


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Steven R Erbstoesser, Claude E Cooke Jr, Richard G Sinclair, Michael M Epstein: Composition for reducing the permeability of subterranean formations. Exxon Production Research Co, James J Riley Jr, Marc L Delflache, July 2, 1985: US04526695 (169 worldwide citation)

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 poly ...


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