基于ABAQUS的井壁强化数值模拟研究

宋丁丁; 邱正松; 王灿; 刘均一; 王强; 钟汉毅; 赵欣

doi:10.3969/j.issn.1001-5620.2016.03.003

基于ABAQUS的井壁强化数值模拟研究

doi: 10.3969/j.issn.1001-5620.2016.03.003

1.
中国石油大学(华东)石油工程学院, 山东青岛 266580
2. 中国石油集团渤海钻探工程有限公司泥浆技术服务分公司, 天津 300457

基金项目: 国家重点基础研究发展规划（973）项目“深水油气井完井与测试优化方法”（2015CB251205）；国家自然基金项目“海洋深水浅层井壁稳定与水合物抑制的机理和新方法研究”（51474236）；“海洋油气井钻完井理论与工程”教育部创新团队（IRT_14R58）。

详细信息

作者简介:
宋丁丁,1989年生,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。E-mail:sddupc@126.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: 2016-04-09
- 刊出日期: 2016-05-31

Numerical Simulation of Borehole Wall Strengthening Using ABAQUA

1.
School of Petroleum Engineering, China University of Petroleum, Qingdao, Shandong 266580
2. Drilling Fluids Technology Service Company, BHDC, Tianjin 300457

More Information

Corresponding author: 邱正松,E-mail:qiuzs63@sina.com。

摘要

摘要: 近年来，井壁强化技术已成为国外钻井工程中提高地层承压能力的重要手段。以ABAQUS软件为平台，建立二维井壁强化模型，通过数值模拟方法探讨了井壁强化作用机理及影响因素。结果表明，封堵材料在裂缝中架桥后，挤压两侧地层，使井周应力增加，且在低角度（0～30°）范围内，周应力增量最大；周应力重新分布后，地层破裂压力提高，且易破裂点的位置发生偏移；在一定裂缝开度范围内，裂缝开度越大，表明对裂缝两侧地层挤压越严重，强化井壁的效果越明显。地应力各向异性、封堵架桥位置及井眼压力对周应力影响较大，应力各向异性越严重，井眼压力越大，架桥后周应力增量越大；封堵材料在距离井壁越近的位置架桥，在一定范围内强化井壁的效果越明显，随着架桥位置逐渐靠近缝尖，强化井壁的作用逐渐减弱。
- 井壁强化 /
- 地层承压能力 /
- 数值模拟 /
- 井周应力 /
- 裂缝开度
Abstract: The borehole wall strengthening technology has in recent years been becoming an important means of enhancing the compressive strength of formations all over the world. This paper discusses a two-dimensional model for borehole wall strengthening based on the software ABAQUS, and the working mechanism of and factors affecting borehole wall strengthening through numerical simulation. It has been found that plugging materials, after bridging the fractures in the formations, laterally press the formations on both sides, increasing the peripheral stresses of the borehole which have the maximum increase between the lower angles of 0° and 30°. After the redistribution of the peripheral stresses, the fracture pressure of the formation is increased, and the easy-to-fracture point is deviated from its original position. In certain fracture openings, the wider the fractures, the more severe the lateral formations are pressed, and hence the better the strengthening of the borehole wall. Anisotropy of geo-stresses, positions of the bridging by plugging agents and borehole pressures all play important roles in affecting the peripheral stresses. The more severe the anisotropy, and the higher the borehole pressure, the higher the peripheral stress increments after bridging. Bridging spots of the plugging agents that are much closer to the borehole wall mean better strengthening effects; with the bridging spots moving towards the apexes of the fractures, the borehole wall strengthening dies away.
- Borehole wall strengthening /
- Compressive capacity of formation /
- Numerical simulation /
- Peripheral stress of borehole /
- Fracture opening

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