A theoretical evaluation method for mechanical sealing integrity of cementing sheath

被引：32
作者：
Bu, Yuhuan [1 ,2 ]
Ma, Rui [2 ]
Guo, Shenglai [1 ,2 ]
Du, Jiapei [3 ]
Liu, Huajie [1 ,2 ]
Cao, Xuechao [2 ]
机构：
[1] China Univ Petr East China, Key Lab Unconvent Oil & Gas Dev, Shandong Key Lab Oilfield Chem, Minist Educ, Qingdao 266580, Peoples R China
[2] China Univ Petr East China, Sch Petr Engn, Qingdao 266580, Peoples R China
[3] RMIT Univ, Sch Engn, Civil & Infrastruct Discipline, Melbourne, Vic 3001, Australia
来源：
APPLIED MATHEMATICAL MODELLING | 2020年 / 84卷
关键词：
Cement sheath; Sealing integrity; Convergence-constraint method; Evaluation methods;
D O I：
10.1016/j.apm.2020.03.001
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The sealing integrity of cement sheath directly affects the service life of oil and gas wells, and plays an important role in oil well operation and production. In this paper, the evaluation of sealing integrity of cement sheath was divided into two parts: the integrity of formation and cement sheath, and the integrity of cement sheath and casing. Based on the convergence-constraint theory, the effect of convergence stress generated by formation on cement slurry during the hardening process was considered. And the evaluation method for casing-cement-formation sealing integrity was established. In addition, a quantitative relationship between compressive strength of cement sheath and formation characteristic parameters was proposed to determine the cement-formation sealing integrity. Besides, the integrity evaluation method of casing-cement-formation combination was verified by tensile strength, compressive strength and plastic zone of cement. The field application analysis showed that this method is valid to predict the cement failure. During the cementing operation, the integrity of casing-cement-formation interface can be controlled by adjusting the properties of the cement sheath. (C) 2020 Elsevier Inc. All rights reserved.
引用
收藏
页码：571 / 589
页数：19
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