China Petroleum & Chemical Corporation

Fushun Research Institute of Petroleum and Petrochemicals, Sinopec Corp.

Fushun Research Institute of Petroleum and Petrochemicals, Inopec Corp.

Zhizhi Zhang

Bo Qin

Quanjie Liu

Xiwen Zhang

Chao Yang

Zequn Yin

Xiaolei Sun

Jiao Lu

Disclosed are an associated copolymer, a method for preparation of a polymer and a polymer prepared with the method, a use of the associated copolymer and/or the polymer in drilling fluids, and a drilling fluid containing the associated copolymer and/or the polymer. The associated copolymer comprises acrylamide structural units, zwitter-ionic structural units, and cationic polyamine structural units at a specific proportion, and the cationic polyamine structural units have specific kinematic viscosity and cationic degree; thus, when the associated copolymer is used as a viscosity improver for drilling fluids, the obtained drilling fluid not only has favorable apparent viscosity after it is aged at a high temperature, but also has high dynamic shear force, and is resistant to high temperature up to 200&#xb0; C. or above, resistant to NaCl up to saturated concentration, and resistant to CaClup to 20 wt % concentration.

Associated copolymer and preparation method thereof, and drilling fluid

Disclosed are a novel NU-85 molecular sieve having a specific surface area ranging from about 405 m/g to about 470 m/g and a pore volume ranging from about 0.27 cm/g to about 0.35 cm/g, and processes for preparing the NU-85 molecular sieve.

Nu-85 molecular sieve having a large pore volume and processes for preparing the same

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Liaoning, China

Zhizhi Zhang