Baroid Drilling Fluids, Inc.

M J Timm

Lev Bromberg

E C Lupton

David Diggs

Barry Hand

Mara Stein

Marie Kearney

Michael Orkisz

The materials include non-polyampholite crosslinked polymers and gels based on a polymer which in uncrosslinked form is substantially soluble in ionic fluids and substantially insoluble in water. The materials change their state of hydration in response to an environmental trigger. The disclosed materials are useful as drilling, completion or workover fluids in wells such as hydrocarbon producing wells. According to the disclosed method, crosslinked polymers or gels are introduced into a stratum, blocking or bridging the pores of the stratum. Thereafter, an environmental condition is changed to cause the hydrated material to become less hydrated to unblock the pores allowing production from the well.

Drilling compositions and methods

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Acton, MA, United States of America

M J Timm