Process for disruption of filter cakes

Details Process for disruption of filter cakes Process for disruption of filter cakes

2011-05-03

2011-05-03

Figueroa, John J (Department: 1765)

Earth boring, well treating, and oil field chemistry

Earth boring

Contains enzyme or living microorganism

C507S110000, C507S111000, C507S112000, C507S117000, C507S118000, C507S129000, C507S139000, C166S305100

Reexamination Certificate

active

07935660

ABSTRACT:
A process for producing a self-disrupting filter cake in an underground formation, which process comprises: (a) incorporating into a drilling fluid a solid polymer capable of being converted by hydrolysis into one or more organic acids; (b) using the drilling fluid to drill a wellbore into the underground formation such that the solid polymer in the drilling fluid contributes to the formation of a filter cake; and (c) allowing the solid polymer to hydrolyse in the presence of water and to disrupt the integrity of the filter cake. A drilling fluid which contains as a bridging agent one or more solid polymers capable of being converted by hydrolysis into one or more organic acids is also provided.

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