Dynamic impacts on the survivability of shale gas wells piercing longwall panels
Dynamic impacts on the survivability of shale gas wells piercing longwall panels
复制标题
对页岩气井穿孔长壁面板生存能力的动态影响
DOI：
10.1016/j.jngse.2015.08.008
复制
发表时间：
2015-09
影响因子：
--
通讯作者：
Wang Yi
中科院分区：
文献类型：
--
作者：
Liang Shun;Elsworth Derek;Li Xuehua;Fu Xuehai;Yang Dong;Yao Qiangling;Wang Yi
Gas wells traversing active longwall panels are susceptible to failure on account of various strata movements induced by mining activities. To reveal the dynamic impacts of longwall mining on the survivability of these shale gas wells, particularly during the mining cycle as the twin flanking panels successively approach and then pass beyond the wells, a three dimensional finite element model is applied to explore the evolution of potential distress to the wells by defining the magnitudes of various well deformations. The results demonstrate that, wellbores undergo accelerated or significant deformation (increase or decrease) when each advancing panel approaches within tens of meters and the deformation stabilizes as the panel passes the well by tens (deep mining, ∼300 m) or up to one hundred plus (shallow mining, ∼100 m) meters. Wells are more susceptible to instability when each panel, especially the second panel, advances past the well by approximately 50 m in the case of deep mining and more than one hundred meters for shallow mining with the accumulative deformation reaching the maximum. For mining at shallow depths (∼100 m), wells deform by axial compaction, longitudinal distortion, lateral compression and tension in the vicinity of the seam, and by shear in layers close to the surface. Conversely, for deep mining (∼300 m) the most severe deformations are mainly restricted to the seam and its shallow roof and floor. Locating the well slightly closer to the rib of the second advancing panel (e.g., 7.5 m out from the pillar-center for a 50 m wide three-entry longwall pillar) achieves improved well integrity.
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DOI：
10.2523/104035-ms
发表时间：
2006-11
期刊：
--
影响因子：
--
作者：
A. Al-Ajmi;R. Zimmerman
通讯作者：
A. Al-Ajmi;R. Zimmerman
影响因子：
--
作者：
Xing Zhang;W. Powrie;R. Harkness
通讯作者：
Xing Zhang;W. Powrie;R. Harkness
影响因子：
5.6
作者：
Whittles, D. N.;Lowndes, I. S.;Jobling, S.
通讯作者：
Jobling, S.
影响因子：
7.4
作者：
Schatzel, Steven J.;Karacan, C. Ozgen;Goodman, Gerrit V. R.
通讯作者：
Goodman, Gerrit V. R.
DOI：
10.1016/0148-9062(83)91724-2
发表时间：
1983-02
期刊：
International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts
影响因子：
--
作者：
M. Singh;F. Kendorski
通讯作者：
M. Singh;F. Kendorski