China Petroleum & Chemical Corporation

Sinopec Research Institute of Petroleum Engineering

Sinopec Petroleum Engineering Technology Research Institute Co., Ltd.

Yongxue Lin

Xiaohua Yang

Lin Wang

Fan Yang

Haibo Wang

Jian He

Sheng Shuang Li

Zhoujun Li

Xiaoqiang Dong

Xiong Li

Xianguang Wang

Suli Zhao

Xiaolin Qian

Xiuzhen Han

Jianwu Zhen

Junbin Jin

Long Chai

A random copolymer, a preparation method of the random copolymer, a drilling fluid containing the random copolymer. The random copolymer contains structural unit (A) represented by formula (1), structural unit (B) represented by formula (2), structural unit (C) represented by formula (3), and structural unit (D) represented by formula (4) or (5): wherein X is halogen. When the random copolymer is used as a filter loss reducer in a high-calcium drilling fluid, the filter loss of the high-calcium drilling fluid can be reduced.

Random copolymer and preparation method thereof, and drilling fluid

A maleamic acid monomer, and a preparation method and a use of the maleamic acid monomer. The structural formula of the monomer is as follows: formula (1), wherein, R is selected from The maleamic acid monomer provided in the present invention may be used as a comonomer to prepare temperature-tolerant and calcium salt-tolerant polymers.

Maleamic acid monomer and preparation method and use thereof

A composition and use thereof are disclosed herein. The composition comprises at least two selected from the group of amphiphilic block copolymer, polyurethane and acidic ionic compound. Also an oil-based drilling fluid comprising the composition and a method improving shearing force of oil-based drilling fluid are disclosed. The composition disclosed herewith can raise the shearing force of oil-based drilling fluid.

Composition and use therof, oil-based drilling fluid and a method for raising shearing force of oil-based drilling fluid

The present invention provides a filtration control agent and a drilling fluid containing the same. The filtration control agent comprises the product obtained from the reaction of water, lignite, aldehyde and sulfonate polymer at 180-220&#xb0; C. and the units containing sulfonate groups in the molecular chains of sulfonate polymer are at least 30 wt %. The filtration control agent provided by the present invention features a good filtration loss reduction effect and a low viscosity effect and can improve the rheological behavior of the drilling fluid, thereby meeting the requirements of the drilling of deep wells, ultra-deep wells and ultra high pressure formations.

Filtration control agent and a drilling fluid containing the same

Growing community of inventors

Beijing, China

Yongxue Lin