欠平衡钻井煤层井壁稳定有限元数值计算研究

doi:10.16182/j.issn1004731x.joss.201811025

系统仿真学报 ›› 2018, Vol. 30 ›› Issue (11): 4249-4255.doi: 10.16182/j.issn1004731x.joss.201811025

欠平衡钻井煤层井壁稳定有限元数值计算研究

李玉梅¹, 苏中¹, 张涛¹, 张德龙², 于丽维³, 思娜⁴

1.北京信息科技大学高动态导航技术北京市重点实验室,北京 100101;
2.北京探矿工程研究所,北京 100083;
3.中国石油新疆石油工程建设有限责任公司,克拉玛依 834003;
4.中国石化石油工程技术研究院,北京 100101

收稿日期:2018-06-21 修回日期:2018-08-29 发布日期:2019-01-04
作者简介:李玉梅(1981-),女,山东郓城,博士,助理研究员,研究方向为复杂工况数值模拟计算方法。
基金资助:
国家自然科学基金面上项目(51374223), 北京信息科技大学师资补充与支持计划(5029011102),北京信息科技大学科研水平提高重点研究培育项目(5221835901)

Numerical Simulation of Borehole Stability in Underbalanced Drilling Coal Seam

Li Yumei¹, Su Zhong¹, Zhang Tao¹, Zhang Delong³, Yu Liwei³, Si Na⁴

1.Beijing Key Laboratory of High Dynamic Navigation Technology, University of Beijing Information Science & Technology, Beijing 100101, China;
2. Beijing Institute of Exploration Engineering, Beijing 100083, China;
3. PetroChina Xinjiang Petroleum Engineering Construction Co., Ltd. Karamay 834000, China;
4. SINOPEC Research Institute of Petroleum Engineering, Beijing 100101, China

Received:2018-06-21 Revised:2018-08-29 Published:2019-01-04

摘要/Abstract

摘要： 根据山西沁水盆地3#煤层地层条件参数,考虑煤层井壁渗流与变形耦合作用,利用数值模拟方法建立煤岩井壁稳定弹-塑性数值模型,研究欠平衡钻井条件下近井壁孔隙压力随渗流时间的变化和时间延迟效应对井壁稳定的影响规律。对煤层井壁最大位移量、井周塑性最大变形量随井底压力的变化规律进行了研究分析。仿真结果表明,井壁稳定性确实存在时间延迟效应,并且在考虑渗流与变形耦合条件下对于煤岩的塑性研究分析更为合理和有效,并为指导钻井施工提供充裕时间条件。

关键词: 煤层气, 井壁稳定, 井壁渗流, 孔隙压力, 时间延迟

Abstract: According to the formation parameters of No.3 coal seam in the Qinshui Basin, Shanxi Province, considering the interaction between seepage and deformation in the borehole wall of coal seam, using the finite element method for establishing the stable elastoplastic numerical model of the borehole in coal seam,the variation of pore pressure near the wellbore wall with the seepage time and the effect of time delay on wellbore stability under underbalanced drilling condition were studied. The variation law of maximum displacement and maximum plastic deformation around borehole wall with bottom pressure were analyzed. The simulation results show that there is indeed a time delay effect on wellbore stability and the plastic analysis of coal and rock under consideration of seepage and deformation coupling conditions is more reasonable and effective, and it provides sufficient time conditions for guiding drilling construction.

Key words: coalbed methane, borehole wall stability, wall seepage, pore pressure, time delay

中图分类号:

TE31

李玉梅, 苏中, 张涛, 张德龙, 于丽维, 思娜. 欠平衡钻井煤层井壁稳定有限元数值计算研究[J]. 系统仿真学报, 2018, 30(11): 4249-4255.

Li Yumei, Su Zhong, Zhang Tao, Zhang Delong, Yu Liwei, Si Na. Numerical Simulation of Borehole Stability in Underbalanced Drilling Coal Seam[J]. Journal of System Simulation, 2018, 30(11): 4249-4255.

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欠平衡钻井煤层井壁稳定有限元数值计算研究

Numerical Simulation of Borehole Stability in Underbalanced Drilling Coal Seam

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