三轴地应力作用下固井二界面的稳定性

doi:10.7623/syxb2019S2015

石油学报 ›› 2019, Vol. 40 ›› Issue (S2): 152-159.DOI: 10.7623/syxb2019S2015

三轴地应力作用下固井二界面的稳定性

杨浩

中国地质大学(北京)工程技术学院北京 100083

收稿日期:2019-10-08 修回日期:2019-12-11 出版日期:2019-12-25 发布日期:2020-04-24
通讯作者: 杨浩
作者简介:杨浩,男,1978年2月生,2002年获西南石油学院石油工程专业学士学位,2009年获中国石油大学(北京)油气田开发工程专业博士学位,现为中国地质大学(北京)工程技术学院副教授、博士生导师,主要从事钻井、固井、完井、钻井液、增产改造、非常规能源、岩石力学、提高采收率、石油工程测试分析等专业技术研究工作。Email:yanghao@cugb.edu.cn
基金资助:
国家自然科学基金面上项目"高温、高压、低弹性模量复合固井材料研究"（No.51474192）资助。

Stability of cement-formation interfaces under triaxial ground stress

Yang Hao

School of Engineering and Technology, China University of Geosciences, Beijing 100083, China

Received:2019-10-08 Revised:2019-12-11 Online:2019-12-25 Published:2020-04-24

摘要/Abstract

摘要：

目前地层—水泥环—套管组合体稳定性研究主要基于平面，没有考虑组合体三维状态下受三轴地应力作用时组合体固井二界面的稳定；同时测试胶结强度普遍采用压剪切方法，测试数据重复性差。通过建立三维地层—水泥环—套管线弹性组合体模型，研究固井第一界面（水泥环—套管）、第二界面（地层—水泥环）的分离（没有胶结）和不分离（胶结良好）情况下的间距和接触压力，以及分离情况下摩擦力（即压剪切强度）变化及垂直主应力对称、非对称变化对组合体稳定的影响。研究结果可以看出，在接触面光滑、不存在窜流通道的情况下，组合体固井二界面分离后界面存在间距，当窜流压力大于接触压力，固井二界面就发生窜流，且固井第二界面比第一界面更容易窜流。固井二界面的摩擦力对组合体稳定性没有影响；垂直主应力较小时固井二界面的间距较小，但对固井二界面的接触压力没有影响，采用压剪切方法测试胶结强度评价固井二界面稳定性没有意义。因此，固井二界面的防窜主要通过三轴应力施加的接触压力实现；固井二界面的胶结强度相对三轴地应力较低，不起主要防窜作用。

关键词: 固井第一界面, 固井第二界面, 三维, 地层, 水泥环, 套管, 摩擦力, 地应力

Abstract:

Currently, there are mxainly planar-based researches on the stability of formation-cement sheath-casing combination body, without considering the stability of the cement-formation interface of the combination body under triaxial ground stress in the three-dimensional state. Moreover, the cementing strength is generally tested by the method of compressional shear, and the repeatability of test data is poor. Through establishing a three-dimensional model for the linear elastic formation-cement sheath-casing combination body, a study is performed on the spacing and contact pressure in the case of separation (no cementation) and non-separation (good cementation) at the cementing first interface (cement sheath-casing) and the cementing second interface (formation-cement sheath) and the effect of the changes in friction (i.e., compressional shear strength) and the symmetrical and asymmetric changes in the vertical principal stress on the stability of the combination body. The research results show that when the contact surface is smooth and there is no channel for cross flow, a gap exists between the cement-formation interfaces of the combination body after separation. When the pressure of cross flow is greater than the contact pressure, cross flow occurs at the cement-formation interfaces, expecially at the second interface. The friction of the cement-formation interface has no effect on the stability of the combination body. The spacing between the cement-formation interfaces is small when the vertical principal stress is small, but it has no effect on the contact pressure at the cement-formation interface. It is insignificant to evaluate the stability of cement-formation interface using cementation strength tested by the method of compressional shear. Therefore, Anti-channeling at the cement-formation interfaces is mainly achieved by the contact pressure exerted by triaxial stress; the cementation strength of the cement-formation interface is lower than the triaxial ground stress, and it does not play the main role in anti-channeling.

Key words: cementing first interface, cementing second interface, three-dimensional, formation, cement sheath, casing, friction, ground stress

中图分类号:

TE256

杨浩. 三轴地应力作用下固井二界面的稳定性[J]. 石油学报, 2019, 40(S2): 152-159.

Yang Hao. Stability of cement-formation interfaces under triaxial ground stress[J]. Acta Petrolei Sinica, 2019, 40(S2): 152-159.

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三轴地应力作用下固井二界面的稳定性

Stability of cement-formation interfaces under triaxial ground stress

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