Petrochina Company Limited

China National Petroleum Corporation

Cnpc Engineering Technology R&d Company Limited

Beijing Huamei Inc Cnpc

Pu Xu

Lili Chen

Hao Wang

Ming Xu

Wei Bai

Wei Liu

Chi Zhang

Yong Ma

Hua Zhang

Jianjun Yi

Yao Wang

Jianzhou Jin

Yongjin Yu

Zhifei Li

Shuoqiong Liu

Fengzhong Qi

Zhiwei Ding

Zishuai Liu

Yuchao Guo

Youzhi Zheng

Weisong Cui

Chongfeng Zhou

Qin Han

Congfeng Qu

Yusi Feng

Bin Lyu

Xiaobing Zhang

Fuchen Liu

Kuilong Tan

Shunping Zhang

Jiaying Zhang

Wanqing Ju

Haizhi Zhang

Guifu Wang

Chenyang Zhou

Songbing Yan

Yiliu Sun

Jiwei Jiang

Qinghong Xu

Xinyuan Liu

An ultra-high temperature resistant cement slurry system comprising cement, an ultra-high temperature strength stabilizer, an ultra-high temperature reinforcing material, a density regulator, an ultra-high temperature suspension stabilizer, a dispersant, a fluid loss additive, a retarder, a defoaming agent and water, wherein the ultra-high temperature suspension stabilizer comprises an ether-based starch, an aluminosilicate and a polyalcohol polymer. The method for preparing the cement slurry system includes dry mixing and wet mixing raw materials homogeneously, respectively, and then homogeneously mixing the dry mix and wet mix to obtain the cement slurry system. The cement slurry system can be used for cementing in deep wells and ultra-deep wells at high and ultra-high temperatures.

Ultra-high temperature resistant cement slurry system for cementing and preparation method and use thereof

Disclosed is a catalyst for the polymerization of olefins comprising thienyl-substituted silanes, which comprises a solid titanium catalyst component containing titanium, magnesium and a halogen as the main components, an alkylaluminum compound, and a component of organosiloxane compound comprising two thienyl as substituents represented by general formula (I). The molar ratio of each catalyst component is 1:50-150:5-50 based on titanium:aluminum:silicon. When the catalyst is used in the polymerization of propylene, the polymerisate obtained has a very high degree of isotacticity, and the yield is high. 

Catalyst for polymerization of olefins comprising thienyl-substituted silanes

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Beijing, China

Pu Xu