Petrochina Company Limited

Cnpc Engineering Technology R&d Company Limited

China National Petroleum Corporation

Beijing Huamei Inc Cnpc

Youzhi Zheng

Ming Xu

Wei Liu

Chi Zhang

Yong Ma

Hua Zhang

Yongjin Yu

Jianzhou Jin

Yuchao Guo

Zishuai Liu

Shuoqiong Liu

Fengzhong Qi

Congfeng Qu

Lili Chen

Tao Yang

Qiang Li

Jiang Yu

Zhiwei Ding

Hong Yue

Huiyun Ma

Yusi Feng

Chongfeng Zhou

Shunping Zhang

Xiaobing Zhang

Bin Lyu

Hongfei Ji

Fuyun Wang

Qiyan Tan

Libin Jiao

Wei Li

Bin Wang

Qiang Fu

Yong Wu

Jianhua Guo

Yao Wang

Rui Zheng

Xiaoli Zhao

Qin Han

Ji Chen

Zhaohui Wang

Bo Kong

Pu Xu

Fuchen Liu

Jinping Yuan

Chenyang Zhou

Feng Zhou

Chengquan Li

Youcheng Zheng

Xiaojiao Wang

Yiguo He

Yiliu Sun

Songbing Yan

Guifu Wang

Haizhi Zhang

Jiaying Zhang

Congjing Liu

Yu Sang

Zhao Huang

Huiting Liu

Jiwei Jiang

Jiyun Shen

Xiujian Xia

Minghua Xie

Hongwei Xia

Fenglin Guo

Yong Li

The present disclosure relates to the technical field of oil and gas field exploitation, in particular to an early strength material suitable for a cement slurry system, a cement slurry composition, a cement slurry system, a preparation method therefor and the use thereof. The early strength material contains an aluminum salt, a sodium salt, crystal whiskers, an inorganic mineral and dispersing agent I, wherein the weight ratio of the aluminum salt, the sodium salt, the crystal whiskers, the inorganic mineral and dispersing agent I is (1-3):(1-3):(1-4):(1-8):1. The early strength material provided by the present invention has both high-temperature retarding performance and low-temperature early strength performance; meanwhile, while satisfying well cementing, the cement slurry system prepared from the cement slurry composition containing the early strength material can prolong thickening time of cement slurry under a high-temperature condition, can prevent ultra-retarding of top cement slurry under a low-temperature condition and has increased early strength.

Cement slurry system, preparation method therefor and use thereof

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

A well cementing method is described for improving cementing quality by controlling the hydration heat of cement slurry. By controlling the degree and/or rate of hydration heat release from cement slurry, the method improves the hydration heat release during formation of cement with curing of cement slurry, improves the binding quality between the cement and the interfaces, and in turn improves the cementing quality at the open hole section and/or the overlap section. The cementing method improves cementing quality of oil and gas wells and reduces the risk of annular pressure.

Well cementing method for improving well cementing quality by controlling hydration heat of cement slurry

An apparatus and method for determining a volume stability of well cement including a reaction kettle, a radial contraction, an expansion ring, a heater, a pressurizer, and a volume change parameter tester. The radial contraction and expansion ring include a first casing and a second casing, the first casing is a casing made of elastic material, the second casing is a steel casing, and the first casing sheathes the second casing. The heater and the pressurizer are used to provide a preset temperature and a preset pressure respectively and the volume change parameter tester is used to detect a radial volume change parameter of the well cement. The apparatus is provided with the radial contraction and expansion ring to acquire the radial volume change parameter of the well cement, and comprehensively evaluates the volume stability of the well cement using the radial volume change parameter of the well cement.

Apparatus and method for determining volume stability of well cement

The invention provides a method and device for measuring the elasticity of hardened cement for cementing of oil-gas wells. The measurement method comprises: determining the loading and unloading rates of the hardened cement; determining the maximum loading on the hardened cement; determining the experimental temperature and the experimental pressure of the hardened cement; establishing a stress-strain curve for the hardened cement; and describing the elasticity of the hardened cement with the degree of strain recovery of the hardened cement in different cycles, and describing the mechanic integrity of the hardened cement with the degree of damage to the hardened cement in different cycles. The invention further provides a device for measuring the elasticity of hardened cement for cementing of oil-gas wells. The measurement method and device of the present invention provide a universal comparing platform for research on hardened cement modification as well as examination of domestic and foreign special cement slurry systems, which is of great significance in evaluation of well hole integrity and well life.

Method and device for determining elasticity of cement stone utilized in well cementing of oil-gas well

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Beijing, China

Youzhi Zheng