C - Chemistry – Metallurgy – 09 – K
Patent
C - Chemistry, Metallurgy
09
K
166/17, 31/8
C09K 8/467 (2006.01) C09K 8/04 (2006.01) E21B 43/22 (2006.01)
Patent
CA 1185777
ABSTRACT OF THE DISCLOSURE A composition designed for dissolution or dispersion in water to give an aqueous treatment fluid which is compatible with cement slurries and with drilling muds and a method of using same to displace a drilling mud from a borehole which penetrates a subterranean formation. The compositon comprises a water soluble viscosifier which increases the viscosity of water under mixing and handling conditions but which becomes substantially insoluble in water when exposed to temperatures encountered downhole in a wellbore; a thickener, which is soluble or dispersible in and which increases the viscosity of water at temperatures experienced under downhole conditions; and a third component, a dispersant, which enhances the dispersibility of the viscosifier in water and thereby permits it to go smoothly into solution, and water. The resultant aqueous treatment fluid, at a viscosity of greater than 0.1 and less than 7.5 Image .
390787
Smart & Biggar
The Dow Chemical Company
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