Water-based drilling fluids using latex additives

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

E - Fixed Constructions

21

B

E21B 33/138 (2006.01) C09K 8/508 (2006.01) C09K 8/575 (2006.01)

Patent

CA 2534080

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.

L'invention a trait à un fluide de forage à base d'eau, qui contient un latex polymère pouvant former un film de latex déformable sur au moins une partie d'une formation souterraine. Ledit fluide de forage permet de réduire la pénétration de pression lorsqu'il est utilisé pour forer des formations schisteuses dans le cadre d'opérations d'extraction d'hydrocarbures. On utilise de préférence, en conjonction avec le polymère, un agent de précipitation, tel qu'un silicate ou un complexe d'aluminium (par ex., de l'aluminate de sodium). En général, l'eau présente contient un sel permettant de former une saumure, souvent à saturation, bien que l'invention puisse être mise en oeuvre avec de l'eau douce. Si l'on emploie un sel, il est souvent utile de recourir également à un tensioactif, comme de la bétaïne.

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