Composition for reducing the permeability of subterranean format

Compositions – Leather or fur treating

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166295, 166284, E21B 33138

Patent

active

045266956

ABSTRACT:
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.

REFERENCES:
patent: 2362511 (1939-11-01), Teeters
patent: 3302719 (1967-02-01), Fischer
patent: 3708560 (1973-06-01), Mayer et al.
patent: 3784585 (1974-01-01), Schmitt et al.
patent: 3989632 (1976-11-01), Fischer et al.

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