C - Chemistry – Metallurgy – 09 – K
Patent
C - Chemistry, Metallurgy
09
K
C09K 8/514 (2006.01) C09K 8/44 (2006.01) C09K 8/512 (2006.01) E21B 33/13 (2006.01)
Patent
CA 2455994
A plugging fluid for plugging a subterranean formation zone surrounding a drill hole comprises an emulsion comprising a dispersed aqueous phase containing an aqueous base and a continuous hydrophobic phase containing a polymer consisting of a grafted cellulose ether derivative, a surfactant and a crosslinking activator of the polymer. The polymer is preferably 2- hydroxyethyl cellulose grafted with vinyl phosphonic acid. Upon shearing, preferably through the drilling bit, the emulsion inverts so that the rupture of the emulsion droplets releases the crosslinking activator into the water phase thus forming a gel structure.
L'invention concerne un liquide de colmatage pour colmater une zone de formation souterraine entourant un forage. Ledit liquide comprend une émulsion qui contient une phase aqueuse dispersée contenant une base aqueuse et une phase hydrophobe continue contenant un polymère constitué d'un dérivé d'éther de cellulose greffé, d'un tensioactif et d'un activateur de réticulation du polymère. Ledit polymère est de préférence une 2-hydroxyéthylcellulose greffée à un acide vinyle phosphonique. Lors du cisaillement, de préférence à travers le trépan, l'émulsion s'inverse de sorte que la rupture des gouttelettes de l'émulsion libère l'activateur de réticulation dans la phase aqueuse, permettant ainsi de former une structure de gel.
Garnier Andre
Garrison Greg
Maberry Jack
Schlumberger Canada Limited
Smart & Biggar
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