Cnpc Engineering Technology R&d Company Limited

Petrochina Company Limited

China National Petroleum Corporation

Jinping Yuan

Ming Xu

Chi Zhang

Jianzhou Jin

Yongjin Yu

Fengzhong Qi

Shuoqiong Liu

Zhiwei Ding

Zishuai Liu

Yuchao Guo

Chongfeng Zhou

Yusi Feng

Wei Li

Hua Zhang

Wei Liu

Yong Ma

Youzhi Zheng

Hong Yue

Congfeng Qu

Hongfei Ji

Bin Lyu

Zhao Huang

Huiting Liu

Jiyun Shen

Youcheng Zheng

Xiujian Xia

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

The invention provides a high temperature resistant Portland cement slurry and a production method thereof. The high temperature resistant Portland cement slurry comprises the following components by weight: 100 parts of an oil well Portland cement, 60-85 parts of a high temperature reinforcing material, 68-80 parts of fresh water, 1-200 parts of a density adjuster, 0.1-1.5 parts of a suspension stabilizer, 0.8-1.5 parts of a dispersant, 3-4 parts of a fluid loss agent, 0-3 parts of a retarder and 0.2-0.8 part of a defoamer. The high temperature resistant Portland cement slurry has a good sedimentation stability at normal temperature, and develops strength rapidly at a low temperature. The compressive strength is up to 40 MPa or more at a high temperature of 350&#xb0; C., and the long-term high-temperature compressive strength develops stably without degradation. Therefore, it can meet the requirements for field application in heavy oil thermal recovery wells, reaching the level of Grade G Portland cement for cementing oil and gas wells.

High temperature resistant Portland cement slurry and production method thereof

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Beijing, China

Jinping Yuan