基于损伤力学变内压条件下水泥环密封完整性模拟

doi:10.7623/syxb202011012

石油学报 ›› 2020, Vol. 41 ›› Issue (11): 1425-1433.DOI: 10.7623/syxb202011012

基于损伤力学变内压条件下水泥环密封完整性模拟

郭辛阳^1,2, 宋雨媛^1,2, 步玉环^1,2, 郭胜来^1,2, 柳华杰^1,2, 王成文^1,2

1. 中国石油大学(华东)非常规油气开发教育部重点实验室山东青岛 266580;
2. 中国石油大学(华东)石油工程学院山东青岛 266580

收稿日期:2020-01-30 修回日期:2020-07-28 出版日期:2020-11-25 发布日期:2020-12-11
通讯作者: 郭辛阳,男,1983年9月生,2006年获中国石油大学(华东)学士学位,2011年获中国石油大学(华东)博士学位,现为中国石油大学(华东)高级实验师、硕士生导师,主要从事固完井方面的科研与教学工作。Email:gdayang@163.com
作者简介:郭辛阳,男,1983年9月生,2006年获中国石油大学(华东)学士学位,2011年获中国石油大学(华东)博士学位,现为中国石油大学(华东)高级实验师、硕士生导师,主要从事固完井方面的科研与教学工作。Email:gdayang@163.com
基金资助:
国家自然科学基金项目（No.51704325，No.51704321）、教育部长江学者和创新团队发展计划项目（IRT_14R58）和中央高校基本科研业务费专项（18CX02103A）资助。

Simulation of seal integrity of cement sheath under variable internal casing pressure based on damage mechanics

Guo Xinyang^1,2, Song Yuyuan^1,2, Bu Yuhuan^1,2, Guo Shenglai^1,2, Liu Huajie^1,2, Wang Chengwen^1,2

1. MOE Key Laboratory of Unconventional Oil&Gas Development, China University of Petroleum, Shandong Qingdao 266580, China;
2. School of Petroleum Engineering, China University of Petroleum, Shandong Qingdao 266580, China

Received:2020-01-30 Revised:2020-07-28 Online:2020-11-25 Published:2020-12-11

摘要/Abstract

摘要：

针对变内压条件下水泥环密封完整性失效问题，基于连续损伤力学理论，采用同时考虑水泥石损伤和屈服后应力—应变关系的塑性损伤本构模型来描述实际水泥石的全应力—应变力学性能，研究了水泥石力学性能对密封完整性的影响。研究结果表明，向常规水泥浆中加入弹韧性材料形成弹韧性水泥，降低了水泥环弹性模量，既可以预防微间隙形成和减小微间隙尺寸，又可以预防和减少水泥环拉伸破坏。但并非弹性模量越低，弹韧性水泥密封完整性越好，密封完整性还与水泥环拉压弹性变形性能有关，同等情况下水泥环最大拉压弹性应变越大，其密封完整性越不容易失效。建议根据水泥环的弹性模量和拉压全应力—应变关系来评价水泥环密封完整性。研究结果为水泥环密封完整性评价和水泥石力学性能优化提供了一定依据。

关键词: 变内压, 水泥环, 密封完整性, 损伤, 塑性, 弹性模量

Abstract:

Aiming at the failure in the seal integrity of cement sheath under the variable internal casing pressure, based on the theory of continuous damage mechanics, this paper describes the complete stress-strain mechanical properties of actual set cement using the constitutive model of plastic damage that considers both set cement damage and the post-yield stress-strain relationship, and studies the effect of the mechanical properties of set cement on seal integrity. The results show that adding elastic-ductile materials into conventional cement slurry to form elastic-ductile cement will reduce the elastic modulus of cement sheath, which can prevent the formation of micro gap and reduce the size of micro gap, as well as prevent and reduce the tensile damage of cement sheath. However, it does not mean that the lower the elastic modulus, the better the seal integrity of elastic-ductile cement. The seal integrity is also related to the tensile and compressive elastic deformation performance of cement sheath. Under the same circumstances, the greater the maximum tensile and compressive elastic strain of cement sheath, the more impossible the failure in seal integrity. It is recommended to evaluate the seal integrity of cement sheath comprehensively based on its elastic modulus and the complete stress-strain relationship under tension and compression. The research results provide a basis for evaluating the seal integrity of cement sheath and optimizing the mechanical properties of set cement.

Key words: variable internal pressure, cement sheath, seal integrity, damage, plasticity, elastic modulus

中图分类号:

TE256

郭辛阳, 宋雨媛, 步玉环, 郭胜来, 柳华杰, 王成文. 基于损伤力学变内压条件下水泥环密封完整性模拟[J]. 石油学报, 2020, 41(11): 1425-1433.

Guo Xinyang, Song Yuyuan, Bu Yuhuan, Guo Shenglai, Liu Huajie, Wang Chengwen. Simulation of seal integrity of cement sheath under variable internal casing pressure based on damage mechanics[J]. Acta Petrolei Sinica, 2020, 41(11): 1425-1433.

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基于损伤力学变内压条件下水泥环密封完整性模拟

Simulation of seal integrity of cement sheath under variable internal casing pressure based on damage mechanics

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