井壁强化作用影响因素的数值模拟

李佳; 邱正松; 宋丁丁; 刘均一; 钟汉毅; 王伟吉

doi:10.3969/j.issn.1001-5620.2017.02.001

井壁强化作用影响因素的数值模拟

doi: 10.3969/j.issn.1001-5620.2017.02.001

1. 中国石油大学(华东)石油工程学院, 山东青岛 266580;
2. 中石化中原石油工程有限公司, 河南濮阳 457000

基金项目:

国家重点基础研究发展规划（973）项目（2015CB251205）、国家自然科学基金项目（51474236）、教育部创新团队（IRT1086）。

详细信息

作者简介:
李佳,1994年生,现为中国石油大学(华东)油气井工程专业在读硕士研究生,主要从事钻井液技术研究工作。电话15763949535;E-mail:15763949535@163.com。

通讯作者:
邱正松,E-mail:qiuzs63@sina.com。

中图分类号: TE283
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出版历程
- 收稿日期: 2016-12-01
- 刊出日期: 2017-03-31

Numeric Simulation of Factors Affecting the Strengthening of Borehole Wall

1. College of Petroleum Engineering, China University of Petroleum, Qingdao, Shandong 266580;
2. Cementing Branch of Zhongyuan Petroleum Engineering Co. Ltd., Sinopec, Puyang, Henan 457000

摘要

摘要: 近年来，井壁强化等先期封堵技术逐渐得到了应用和发展，但其相关影响因素及作用机理还未得到深入揭示。通过建立多孔弹性介质的有限元模型，考虑地应力各向异性、架桥位置、漏失速率及裂缝后端压力等因素的影响，对井壁强化机理及相关影响因素进行了分析。模拟结果表明，刚性封堵材料通过减缓裂缝后端由于压力下降所产生的形变，并将该形变向井壁周围传递，使架桥后裂缝附近的井壁周向应力增加，从而导致裂缝趋于闭合；地应力各向异性越小，裂缝闭合趋势越明显；漏失速率越大，越有利于封堵颗粒的快速架桥，井壁强化效果越好；封堵材料架桥时，架桥位置距离裂缝端口越近，架桥位置后端压力越接近地层孔隙压力，越有利于裂缝的闭合及抑制裂缝尖端的扩展。
- 井壁强化 /
- 多孔弹性介质 /
- 数值模拟 /
- 裂缝架桥 /
- 周向应力 /
- 影响因素
Abstract: Borehole wall strengthening, as an early-stage borehole wall plugging technology, has been widely applied and developed in recent years, while the influencing factors and mechanism of the technology is still not revealed yet. In a study conducted to analyze the influencing factors and the mechanism of the borehole wall strengthening technology, a finite element model of porous media was established, and the anisotropic properties, location of bridging, rate of mud losses, and the pressure at the rear-end of the fracture were studied for their effects on the strengthening of borehole wall. It was shown in laboratory simulation that rigid plugging material, by mitigating the deformation caused by the pressure reduction at the rear-end of fractures, and transmitting the deformation to around the wellbore, increased the circumferential stress around the wellbore near the fractures after being bridged, thereby causing the fractures to close. It was found that the less the anisotropy of the formation stresses, the more remarkable the tendency of the fractures to close. Also found was that the higher the rate of mud loss, the more beneficial it was for the particles to bridge, and the better for the strengthening of borehole wall. In bridging, the nearer was the location of bridging to the mouth of the fractures, the closer was the pressure at the rear-end of the bridging location to the formation pore pressure, and it was more beneficial to the closure of fractures and to the inhibition of the development of the fracture tips.
- Borehole wall strengthening /
- Porous elastic medium /
- Numeric simulation /
- Bridge in fracture /
- Circumferential stress /
- Influencing factors

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参考文献(12)

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