C - Chemistry – Metallurgy – 09 – K
Patent
C - Chemistry, Metallurgy
09
K
C09K 8/08 (2006.01) C09K 8/12 (2006.01) C09K 8/487 (2006.01) C09K 8/508 (2006.01) C09K 8/516 (2006.01)
Patent
CA 2745992
Disclosed are compositions and methods for providing fluid-loss control in subterranean wells. Well-completion fluids contain fine particulate additives whose glass-transition temperatures are below the anticipated bottomhole temperature. The particles soften upon injection into the well, whereupon they soften and become deformable. The particles then migrate to the borehole wall and form a seal that reduces further fluid flow from the borehole into the formation. The additive may be supplied as a powder or in the form of a liquid suspension.
L'invention concerne des compositions et des procédés permettant la régulation de la perte de fluide dans les puits souterrains. Les fluides de complétion de puits contiennent des additifs particulaires fins dont les températures de transition vitreuse sont inférieures à la température prévue du fond de puits. Les particules ramollissent après injection dans le puits et deviennent déformables. Les particules migrent alors vers la paroi du puits de forage et forment un joint d'étanchéité qui réduit ensuite l'écoulement du fluide depuis le puits de forage jusque dans la formation. L'additif peut être fourni sous forme d'une poudre ou sous forme d'une suspension liquide.
Schlumberger Canada Limited
Smart & Biggar
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