High temperature resistant Portland cement slurry and production method thereof

US11618844B2 · kind B2 · utility

Assignees

• China National Petroleum Corporation · CN
• CNPC Engineering Technology R&D Company Limited · CN

Inventors

• Hua Zhang · Hangzhou City, CN
• Jianzhou Jin · Beijing, CN
• Shuoqiong Liu · Beijing, CN
• Fengzhong Qi · Beijing, CN
• Yongjin Yu · Chengdu, CN
• Ming Xu · Shanghai, CN
• Jinping Yuan · Beijing, CN
• Zhiwei Ding · Beijing, CN
• Chongfeng Zhou · Beijing, CN
• Chi Zhang · Kunshan, CN
• Zishuai Liu · Beijing, CN
• Yusi Feng · Beijing, CN
• Yuchao Guo · Beijing, CN

Key dates

• Filing date: Jan 28, 2019
• Grant date: Apr 4, 2023
• Expiry date: Nov 26, 2040

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C04B2201/50
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

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° 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.