China Petroleum Chemical Corporation

China University of Geosciences (beijing)

Exploration & Production Research Insitute, Sinopec

China Petro-chemical Corporation Shengli Petroleum Administrative Bureau

Peizhi Yu

Yu Wang

Jing Li

Weiping Xu

Ziming Wang

Changming Su

Jiafen Li

Zhihua Luo

Caixuan Guo

Rushan Liu

Zengchen Guan

Xiushan Liu

Xuesong Xing

Baoyu Guo

Bairu Xia

Yingchun Cui

A star-shaped polyacrylamide copolymer and a preparation method thereof are provided, as well as a drilling fluid containing the star-shaped polyacrylamide copolymer. Only the star-shaped polyacrylamide copolymer is added into the drilling fluid; under a high-temperature environment, the filtration volume of the drilling fluid can be reduced, the high-temperature rheological property of the drilling fluid is improved, and the pressure loss of a circulation system of the drilling fluid is reduced.

Star-shaped polyacrylamide copolymer and preparation method thereof and drilling fluid including the copolymer

An electropositive and water-based production well treating fluid system exhibits electropositivity by using a cationic viscosifier meanwhile matched with a cationic fluid loss additive and, optionally, contains a mud-building agent, an electrical stabilizing agent, a colloid-stabilizing agent, lubricant, an oil layer protective agent and/or a weighting agent. The electropositive production well treating fluid can beffer solve the contradiction of technical requirements between 'treating fluid stability' and 'bore hole stability', and features a strong ability to inhibit the dispersion of clay, a good effect of protecting oil-gas reservoirs, fast drilling speeds, regular shape of bore holes and good resistance to salt.

Electropositive production well treating fluid and method of preparing the same

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Beijing, China

Peizhi Yu