The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 04, 2023
Filed:
Jan. 28, 2019
China National Petroleum Corporation, Beijing, CN;
Cnpc Engineering Technology R&d Company Limited, Beijing, CN;
Hua Zhang, Beijing, CN;
Jianzhou Jin, Beijing, CN;
Shuoqiong Liu, Beijing, CN;
Fengzhong Qi, Beijing, CN;
Yongjin Yu, Beijing, CN;
Ming Xu, Beijing, CN;
Jinping Yuan, Beijing, CN;
Zhiwei Ding, Beijing, CN;
Chongfeng Zhou, Beijing, CN;
Chi Zhang, Beijing, CN;
Zishuai Liu, Beijing, CN;
Yusi Feng, Beijing, CN;
Yuchao Guo, Beijing, CN;
CHINA NATIONAL PETROLEUM CORPORATION, Beijing, CN;
CNPC ENGINEERING TECHNOLOGY R&D COMPANY LIMITED, Beijing, CN;
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.