Drilling compositions and methods

Details Drilling compositions and methods Drilling compositions and methods

1995-12-11

1999-03-30

Wu, Shean G.

Earth boring, well treating, and oil field chemistry

Earth boring

507120, 507219, 507225, 507925, C09K 700, E21B 2100

Patent

active

058889434

ABSTRACT:
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.

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