C - Chemistry – Metallurgy – 09 – K
Patent
C - Chemistry, Metallurgy
09
K
C09K 8/528 (2006.01) C02F 5/08 (2006.01) C09K 8/06 (2006.01) C09K 8/32 (2006.01) E21B 37/06 (2006.01)
Patent
CA 2456834
Fluids, such as completion fluids, containing at least one alkali metal tungstate and optionally at least one chelating agent are described. Methods of removing a filter cake from a well bore surface, which may include one or more alkaline earth metal sulfates, is also described, wherein the method includes contacting the filter cake with the completion fluid of the present invention. A drilling fluid or mud is also described wherein the drilling fluid contains at least one alkali metal tungstate. The drilling fluid preferably further contains at least one emulsifier or surfactant and at least one hydrocarbon-based fluid. The various fluids of the present invention can contain other conventional ingredients and optionally at least one alkali metal formate. The present invention permits the fluids to be essentially solids free due to the use of the alkali metal tungstate.
L'invention concerne des fluides, tels que des fluides de compl~tion, contenant au moins un tungstate de m~tal alcalin et ~ventuellement au moins un agent ch~latant. L'invention concerne ~galement des proc~d~s permettant d'~liminer un g~teau de filtration pouvant contenir un ou plusieurs sulfates de m~tal terreux alcalin de la surface d'un puits, ces proc~d~s consistant ~ mettre en contact le g~teau de filtration avec le fluide de compl~tion de cette invention. L'invention concerne ~galement un fluide ou une boue de forage contenant au moins un tungstate de m~tal alcalin. De pr~f~rence, ce fluide de forage contient ~galement au moins un ~mulsifiant ou un surfactant et au moins un fluide ~ base d'hydrocarbures. Les diff~rents fluides de cette invention peuvent contenir d'autres ingr~dients conventionnels et ~ventuellement au moins un formiate de m~tal alcalin. L'invention permet que ces fluides soient sensiblement d~pourvus de solide gr~ce ~ l'utilisation du tungstate de m~tal alcalin.
Benton William J.
Magri Neal F.
Cabot Specialty Fluids Inc.
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
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