US 12,497,331 B2
High-strength Portland cement slurry for ultra-high temperature cementing, preparation method therefor and application thereof
Hua Zhang, Beijing (CN); Jianzhou Jin, Beijing (CN); Yongjin Yu, Beijing (CN); Congfeng Qu, Beijing (CN); Fengzhong Qi, Beijing (CN); Ming Xu, Beijing (CN); Shuoqiong Liu, Beijing (CN); Zhaohui Wang, Beijing (CN); Yuchao Guo, Beijing (CN); Jiliang Liu, Beijing (CN); Bin Lyu, Beijing (CN); Zhiwei Ding, Beijing (CN); Chi Zhang, Beijing (CN); Zishuai Liu, Beijing (CN); Hongfei Ji, Beijing (CN); Xiujian Xia, Beijing (CN); Yong Li, Beijing (CN); Chongfeng Zhou, Beijing (CN); and Xiaobing Zhang, Beijing (CN)
Assigned to China National Petroleum Corporation;, Beijing (CN); and CNPC Engineering Technology R&D Company Limited, Beijing (CN)
Filed by CHINA NATIONAL PETROLEUM CORPORATION, Beijing (CN); and CNPC Engineering Technology R&D Company Limited, Beijing (CN)
Filed on May 10, 2023, as Appl. No. 18/315,088.
Application 18/315,088 is a continuation of application No. PCT/CN2021/126618, filed on Oct. 27, 2021.
Claims priority of application No. 202011313439.1 (CN), filed on Nov. 20, 2020.
Prior Publication US 2023/0278927 A1, Sep. 7, 2023
Int. Cl. C04B 28/04 (2006.01); C04B 14/06 (2006.01); C04B 14/10 (2006.01); C04B 14/46 (2006.01); C04B 22/14 (2006.01); C04B 40/00 (2006.01); C04B 111/00 (2006.01)
CPC C04B 28/04 (2013.01) [C04B 14/06 (2013.01); C04B 14/10 (2013.01); C04B 14/46 (2013.01); C04B 22/14 (2013.01); C04B 40/0039 (2013.01); C04B 2111/00724 (2013.01); C04B 2201/50 (2013.01)] 14 Claims
 
1. A high-strength Portland cement slurry for ultra-high temperature cementing, comprising by weight:
100 parts of Portland cement, 4-6 parts of a high temperature anti-cracking material, 80-105 parts of a high temperature reinforcing material, 70-78 parts of water, 0.5-1.5 parts of a dispersant, 1-3 parts of a fluid loss additive, 0.5-2.5 parts of a retarder, and 0.2-0.5 parts of a defoamer;
wherein the high temperature reinforcing material is a combination of acid-washed quartz sand, metakaolin, and aluminum sulfate in a mass ratio of 25-35:5-15:1, or a combination of acid-washed quartz sand, metakaolin, feldspar, and sodium sulfate in a mass ratio of 25-35:5-15:5-15:1, or a combination of acid-washed quartz sand, metakaolin, feldspar, and calcium nitrite in a mass ratio of 25-35:5-15:5-15:1.