China Petroleum Chemical Corporation

Sinopec Research Institute of Petroleum Engineering

Exploration & Production Research Insitute, Sinopec

China Petro-chemical Corporation Shengli Petroleum Administrative Bureau

Jiafen Li

Changming Su

Jing Li

Lin Wang

Sheng Shuang Li

Weiping Xu

Xiaohua Yang

Xianguang Wang

Caixuan Guo

Peizhi Yu

Baoyu Guo

Xiaolin Qian

Yingchun Cui

Xiushan Liu

Liwei Ren

Zhifa Wang

Guichuan Liu

Bingzhong Shi

Rushan Liu

Zengchen Guan

A copolymer and preparation method and application thereof are disclosed. The copolymer is random copolymer obtained from monomers consisting of acrylamide, acrylic acid, alkenyl sulfonate, 2-acrylamido-dodecyl sulfonate, p-styrene sulfonate or isoprene sulfonate and so on. The copolymer of present invention can be used as fluid loss additive and has good fluid loss properties, which would not make the drilling fluid thicken at high temperature of 200&#xb0; C. and high salt conditions of saturated brine. It has a medium-pressure fluid loss after aging and rolling for 16 h at high temperature of 200&#xb0; C., as measured in accordance with the American Petroleum Institute Standard Test at room temperature, and has good properties of high temperature-resisting and salt-resisting.

Copolymer and preparation method and application thereof

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

Growing community of inventors

Beijing, China

Jiafen Li