煤矿安全2018，Vol.49Issue(1)：206-209,4.DOI:10.13347/j.cnki.mkaq.2018.01.055
煤层气水平井井周围岩热流固耦合数值分析
Numerical Analysis of Fluid-solid-heat Coupling of Surrounding Rock Around Coalbed Methane Horizontal Wells
摘要
Abstract
The well wall instability is one of the important reasons that affect the industrial exploitation of coalbed methane.In this article,the coalbed methane horizontal well of No.9 coal seam in Ningwu basin was taken as the research object.We analyze the stress distribution and deformation around the well under the influence of fluid-solid-heat coupling and without fluid-solid-heat coupling by the finite element software.The simulation results from fluid-solid-heat coupling are in good agreement with the engineering practice.The Tresca stress,the first,the second and the third principal stresses in the surrounding rock of horizontal well are in the region of stress fluctuation,so it is easy to produce new fractures,and reduce the strength of surrounding rock,which causes instability accidents of well wall easily.In the arc length of AB,in the well section of surrounding rock around the wall (larger than 8.0 cm),the change rate of surrounding rock around well is more than 5％,which is easy to produce well wall instability accidents.关键词
煤层气/热流固耦合/数值分析/井壁稳定/水平井Key words
coalbed methane/fluid-solid-heat coupling/numerical simulation/well wall stability/horizontal well分类
矿业与冶金引用本文复制引用
冯雨实,梁永昌..煤层气水平井井周围岩热流固耦合数值分析[J].煤矿安全,2018,49(1):206-209,4.基金项目
重庆市教委2017年度科学技术研究资助项目(KJ1754490) （KJ1754490）
国家自然科学基金资助项目(51474185) （51474185）
