Fluid loss control and sealing agent for drilling depleted...

E - Fixed Constructions – 21 – B

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E21B 33/138 (2006.01) C09K 8/34 (2006.01) C09K 8/502 (2006.01) E21B 7/00 (2006.01)

Patent

CA 2536372

An oil-based drilling fluid having a polymer latex capable of providing a deformable latex film on at least a portion of a subterranean sand formation has been discovered to inhibit or control fluid loss and act as a sealing agent when used to drill in sand formations for hydrocarbon recovery operations. Typically, the polymer latex is an aqueous suspension of particles formed by emulsion polymerization that is in turn emulsified into a hydrocarbon base fluid. The polymer particles of suitable size precipitate onto the pores of a subterranean sand formation to at least partial seal the formation with a deformable polymer film.

L'invention concerne un fluide de forage à base de pétrole comprenant un latex polymère permettant de créer un film en latex déformable sur au moins une partie d'une formation souterraine dans du sable, permettant d'inhiber ou de réguler la perte de fluide et d'agir comme un agent d'étanchéité, lorsqu'il est utilisé pour forer dans les formations situées dans du sable, dans le cadre d'opérations de récupération d'hydrocarbures. En général, le latex polymère est une suspension aqueuse de particules formées par polymérisation d'émulsion, laquelle est à son tour émulsifiée en un fluide à base d'hydrocarbures. Les particules polymères de tailles appropriées sont précipitées sur les pores d'une formation souterraine dans du sable, de manière à fermer partiellement la formation au moyen du film polymère déformable.

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