页岩气水平井压裂对井筒完整性的影响

doi:10.7623/syxb201603013

石油学报 ›› 2016, Vol. 37 ›› Issue (3): 406-414.DOI: 10.7623/syxb201603013

页岩气水平井压裂对井筒完整性的影响

刘奎, 王宴滨, 高德利, 李星君, 张勇

中国石油大学石油工程教育部重点实验室北京 102249

收稿日期:2015-07-09 修回日期:2016-01-13 出版日期:2016-03-25 发布日期:2016-04-12
通讯作者: 刘奎,男,1987年6月生,2010年获中国石油大学(北京)学士学位,现为中国石油大学(北京)博士研究生,主要从事油气井力学与控制工程方面的研究工作。Email:liukui_2006@163.com
作者简介:刘奎,男,1987年6月生,2010年获中国石油大学(北京)学士学位,现为中国石油大学(北京)博士研究生,主要从事油气井力学与控制工程方面的研究工作。Email:liukui_2006@163.com
基金资助:
国家自然科学基金创新研究群体项目(No.51221003)、国家重大科技专项(2016ZX05009-005)和中国石油天然气集团公司科技项目(2014A4214)资助。

Effects of hydraulic fracturing on horizontal wellbore for shale gas

Liu Kui, Wang Yanbin, Gao Deli, Li Xingjun, Zhang Yong

MOE Key Laboratory of Petroleum Engineering, China University of Petroleum, Beijing 102249, China

Received:2015-07-09 Revised:2016-01-13 Online:2016-03-25 Published:2016-04-12

摘要/Abstract

摘要：

以弹塑性力学为基础,借助复变函数与应力场分解,对页岩气压裂过程中水平段套管-水泥环-地层系统的力学行为进行分析研究,通过接触面上位移连续条件得到了系统各接触表面的受力表达式;以Drucker-Prager岩土屈服条件为破坏准则,得到了水泥环达到屈服时的最大套管内压力,并讨论了套管及水泥环参数变化对系统受力行为的影响规律。计算结果表明:水泥环内表面比套管更容易达到屈服极限,水泥环厚度对水泥环内壁受力影响较小;增加套管壁厚,有利于保护井筒的完整性;套管内径和水泥环弹性模量对水泥环内壁受力影响较大,套管内径和水泥弹性模量越小,则水泥环越安全。研究结果对于页岩气压裂过程中井筒完整性设计控制具有一定的参考价值。

关键词: 页岩气, 水平井, 压裂, 套管-水泥环, Drucker-Prager屈服条件, 井筒完整性

Abstract:

Based on elastic-plastic mechanics, as well as complex variable function and stress field decomposition, this study analyzes the mechanical behaviors of horizontal segment casing-cement sheath-formation system during shale gas fracturing. The stress expression of each contact surface in the system was obtained using the continuous displacement conditions on the contact surface. Drucker-Prager geotechnical yield condition was taken as failure criterion to acquire the maximum inner casing pressure in case of cement sheath yield and discuss the influence laws of the casing and cement-sheath parameter changes on system mechanical behaviors. The calculation results show that the cement-sheath inner surface is more likely to achieve yield limit than casing. The cement-sheath thickness has little impact on the inner-wall stress of cement sheath. The increase of casing-wall thickness will be beneficial to protect shaft integrity. The casing inner-diameter and cement-sheath elastic modulus have greater influences on the inter-wall stress of cement sheath. The smaller the casing inner-diameter and cement elastic modulus are, the more secure the cement sheath will be. The research results provide a certain reference value for the design and control of shaft integrity during shale gas fracturing.

Key words: shale gas, horizontal well, fracturing, casing-cement sheath, Drucker-Prager yield condition, shaft integrity

中图分类号:

TE355.6

刘奎, 王宴滨, 高德利, 李星君, 张勇. 页岩气水平井压裂对井筒完整性的影响[J]. 石油学报, 2016, 37(3): 406-414.

Liu Kui, Wang Yanbin, Gao Deli, Li Xingjun, Zhang Yong. Effects of hydraulic fracturing on horizontal wellbore for shale gas[J]. Acta Petrolei Sinica, 2016, 37(3): 406-414.

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页岩气水平井压裂对井筒完整性的影响

Effects of hydraulic fracturing on horizontal wellbore for shale gas

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