This paper relates to tertiary recovery employing a polymer thickened aqueous drive fluid or mobility control fluid, more particularly, this paper relates to a novel type of thickening agent named AST agent for drive fluid composed of a hydrophobically associating terpolymer (PAAE) and a stabilizer (AN).

AST thickening agent exhibits good thermal stability (at 100°C, thermal aging in 33000 mg/l brine) and electrolytic tolerance (salinity ranging from 16500mg/l to 66000 mg/l) and good resistance to shear relative to the conventional water-soluble polymers such as polyacrylamide, acrylamide/acrylic acid copolymer etc., and furthermore, AST agent has some surface activity.

Many laboratory experiments have been shown that AST thickening agent could be considered as an advanced one in comparision with the conventional water-soluble polymers. Especially AST thickening agent is more suitable for a mobility control fluid in the hostile environment in subterranean formations such as in high salinity and high temperature formations.

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