公开(公告)号：US09719005B2

公开(公告)日：2017-08-01

申请号：US14970000

申请日：2015-12-15

申请人： China Petroleum & Chemical Corporation ,  Fushun Research Institute of Petroleum and Petrochemicals, SINOPEC CORP.

发明人： Chao Yang ,  Zhizhi Zhang ,  Xiaolei Sun ,  Jiao Lu ,  Zequn Yin ,  Quanjie Liu

IPC分类号： C09K8/035 ,  C08F220/56 ,  C08F220/34

CPC分类号： C09K8/035 ,  C08F220/34 ,  C08F220/56 ,  C08F2220/387 ,  C08F212/14

摘要： 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° C. or above, resistant to NaCl up to saturated concentration, and resistant to CaCl2 up to 20 wt % concentration.

公开(公告)号：US11891458B2

公开(公告)日：2024-02-06

申请号：US17658173

申请日：2022-04-06

申请人： CHINA PETROLEUM & CHEMICAL CORPORATION ,  DALIAN RESEARCH INSTITUTE OF PETROLEUM AND PETROCHEMICALS, SINOPEC CORP.

发明人： Chao Yang ,  Chen Wang ,  Zequn Yin ,  Quanjie Liu

IPC分类号： C08B31/00 ,  C08B31/12 ,  C09K8/42 ,  E21B21/00 ,  E21B33/13 ,  E21B33/138

CPC分类号： C08B31/003 ,  C08B31/12 ,  C09K8/426 ,  E21B21/003 ,  E21B33/138

摘要： A preparation method of the starch-containing microsphere includes the steps of first reacting starch with a low concentration of epichlorohydrin, and then reacting the resultant product with a surfactant, followed by final crosslinking to give microspheres. The starch-containing microspheres thus prepared are polydisperse starch-containing microspheres with a uniform particle size distribution, with the particle size being in a range of 0.1-500 μm.