C - Chemistry – Metallurgy – 09 – K
Patent
C - Chemistry, Metallurgy
09
K
C09K 8/36 (2006.01) C09K 8/03 (2006.01)
Patent
CA 2676923
An invert emulsion drilling fluid including an oleaginous fluid, wherein the oleaginous fluid is the continuous external phase of the drilling fluid, a non-oleaginous fluid, wherein the non-oleaginous fluid is the discontinuous internal aqueous phase of the drilling fluid containing water and at least one organic or inorganic salt dissolved in the water, and an aqueous-phase viscosifier, wherein the aqueous-phase viscosifier is selected from the group consisting of a biopolymer, a salt tolerant clay, and a synthetic polymer, and wherein the aqueous-phase viscosifier is dispersed in the non-oleaginous fluid in a sufficient concentration to increase a low shear viscosity of the invert emulsion drilling fluid.
La présente invention concerne un fluide de forage en émulsion inverse comprenant un fluide oléagineux, ledit fluide oléagineux constituant la phase externe continue du fluide de forage, un fluide non oléagineux, ledit fluide non oléagineux constituant la phase aqueuse interne discontinue du fluide de forage contenant de l'eau et au moins un sel organique ou inorganique dissout dans l'eau, ainsi qu'un agent renforçant la viscosité de la phase aqueuse, ledit agent renforçant la viscosité de la phase aqueuse étant choisi dans le groupe constitué d'un biopolymère, d'une argile tolérante au sel et d'un polymère de synthèse, et l'agent renforçant la viscosité de la phase aqueuse étant dispersé dans le fluide non oléagineux à hauteur d'une concentration suffisante pour renforcer la viscosité sous faible cisaillement du fluide de forage en émulsion inverse.
Finlayson & Singlehurst
M-I L.l.c.
LandOfFree
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