C - Chemistry – Metallurgy – 09 – K
Patent
C - Chemistry, Metallurgy
09
K
C09K 8/74 (2006.01) E21B 43/27 (2006.01)
Patent
CA 2522822
An aqueous oilfield treatment fluid containing a chelating agent and an HF source is described. This fluid is effective at dissolving siliceous materials such as clays and keeping the dissolved materials in solution. In particular it is effective at preventing re-precipitation of initially-dissolved silicon as silica and therefore reduces damage to sandstones with which it is contacted. Methods are given for using this fluid for sandstone matrix stimulation, removal of clay-containing drilling fluid components and filter cakes from wellbores, sandstone acid fracturing, and gravel pack and proppant pack cleaning.
Fluide aqueux de traitement pour champs de pétrole. Ce fluide renferme un agent chélatant et une source d'acide fluorhydrique et permet de dissoudre efficacement les matières siliceuses telles que les argiles, et de maintenir en solution les matières dissoutes. Ledit fluide permet notamment d'éviter toute nouvelle précipitation sous forme de silice du silicium dissous au départ, et donc de réduire la dégradation des grès dont il est susceptible de venir au contact. On a prévu des procédés de mise en oeuvre dudit fluide dans la stimulation des matrices en grès, dans l'élimination à partir des puits de forage des constituants de fluide de forage contenant de l'argile et des gâteaux de filtration, dans la fracturation à l'acide des grès, et dans le nettoyage des filtres à gravier et des agents de soutènement.
Chang Frank
Davies Stephen
Frenier Wayne
Ziauddin Murtaza
Schlumberger Canada Limited
Smart & Biggar
LandOfFree
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