Water-based drilling fluids using latex additives

Details Water-based drilling fluids using latex additives Water-based drilling fluids using latex additives

C - Chemistry, Metallurgy

09

K

C09K 8/24 (2006.01) C09K 8/12 (2006.01)

Patent

CA 2350154

A water-based drilling fluid having a polymer latex capable of providing a deformable latex film on at least a portion of a subterranean formation has been discovered to provide reduced drilling fluid pressure invasion when used to drill in shale formations for hydrocarbon recovery operations. A precipitating agent such as a silicate or an aluminum complex (e.g. sodium aluminate) is preferably used in conjunction with the polymer. Typically, the water present contains a salt to form a brine, often to saturation, although the invention may be practiced with fresh water. If a salt is employed, it is often helpful to additionally employ a surfactant, such as a betaine, for example.

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