China University of Petroleum

Yawei Shi

Guancheng Jiang

Lili Yang

Yinbo He

Fan Liu

Kai Wang

Chunlei Wang

Guangchang Ma

Zhengqiang Deng

Xinliang Li

Shuanglei Peng

Li Li Zhao

Yong Qin

Xiao Yang

Chong Liu

Deli Gao

Xianbin Huang

Chunyao Peng

Yang Xuan

Haifang Sun

Gang Qu

Yuxiu An

He Shi

Qingying Ge

Jienian Yan

Tengda Wang

Zepu Cheng

Li Zhao

A preparation method of an ionic liquid shale inhibitor for drilling fluid comprises the following step: subjecting the imidazole-based ionic liquid to a polymerization reaction in water environment under an inert atmosphere, and the produced polymer is used as an ionic liquid shale inhibitor for drilling fluid. The ionic liquid shale inhibitor for drilling fluid has the advantages of desirable inhibition effect, good compatibility, strong high-temperature resistance, simple preparation method and low cost.

Ionic liquid shale inhibitor for drilling fluid and preparation method and application thereof

The present invention relates to the petroleum drilling fluid field, and discloses a modified silicon dioxide nano-particle comprising a modifying polymer chain composed of structural units provided by one or more of monomers represented by the following formula (1) and one or more of monomers represented by the following formula (2). The present invention provides a method for preparing modified silicon dioxide nano-particles and a drilling fluid suitable for shale gas wells containing the modified silicon dioxide nano-particles as a plugging agent. When the modified silicon dioxide nano-particles provided in the present invention are used as a plugging agent in a drilling fluid, they will not agglomerate into large-size particles, and can achieve a good plugging effect. 

Modified silicon dioxide nano-particles and preparation method thereof, and drilling fluid suitable for shale gas wells

The present invention relates to the well drilling field in petroleum industry, in particular to an additive composition suitable for viscosity reduction of oil-based drilling fluids, an oil-based drilling fluid and use thereof. The double-block copolymer mainly consists of a block A and a block B, wherein, the block A is composed of structural units represented by formula (1), the block B is composed of structural units represented by formula (2), and the number-average molecular weight of the block A is 1,500-10,000. The double-block copolymer provided in the present invention can be used as a viscosity reducer in oil-based drilling fluids, especially can be used as a viscosity reducer in high-density clay-free oil-based drilling fluids, and can greatly decrease the apparent viscosity and plastic viscosity of oil-based drilling fluids in high-temperature and high-pressure reservoir while maintaining appropriate shearing force, so as to increase the drilling rate and reduce drilling difficulties. 

Additive composition suitable for viscosity reduction of oil-based drilling fluid, oil-based drilling fluid and use thereof

The present invention relates to the field of petrochemical drilling and discloses a drilling fluid additive composition. The composition contains an emulsifier and a rheological modifier. The emulsifier is one or more of the compounds represented by Formula (1); the rheological modifier is dimer acid-organic amine copolymer, comprising structural units from the dimer acid, structural units from the alkylamine and structural units from the arylamine. The present invention further provides a drilling fluid containing the foregoing composition. When a clay-free oil-in-water drilling fluid contains the drilling fluid additive composition of the present invention containing the emulsifier and rheological modifier, it may have high temperature resistance and high density; 

Drilling fluid additive composition and super high temperature super high density clay-free oil-in-water drilling fluid

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Beijing, China

Yawei Shi