页岩地层中孔隙热弹性井眼稳定力学模型

doi:10.13722/j.cnki.jrme.2013.1968

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摘要

基于多孔介质弹性理论和各向异性线弹性力学，考虑多孔介质中流体组分和流–固–热耦合作用的影响，建立各向异性多孔介质的孔隙热弹性控制方程；将页岩地层视为横观各向同性介质，采用坐标转换方法得到井眼坐标下的本构方程和孔隙热弹性力学模型，给出采用叠加原理进行求解的基本方法，引入弱面强度理论进行稳定性判别；并以直井井壁应力分布和W201–H1井实例分析检验模型的准确性。结果表明：常规模型和本文模型计算出的直井井壁应力分布完全一致(最大误差0.03%)，W201–H1井井眼稳定分析结果与实际情况吻合较好，而传统模型计算结果偏差较大，检验了模型的准确性和可靠性；随着钻开地层时间的增加，井眼周围地层的坍塌区域逐渐变宽和变深；页岩强度各向异性、弹性各向异性、井周渗流作用和传热效应是影响页岩井眼失稳的重要原因，而页岩强度各向异性是井眼失稳的主要力学机制；有必要考虑页岩各向异性、流–固–热耦合效应对井眼稳定的影响。研究结果可为页岩地层井眼稳定分析和钻井施工措施的制定提供参考。

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	马天寿
	陈平

关键词 ：岩石力学, 页岩, 孔隙热弹性力学, 各向异性, 横观各向同性, 斜井, 井眼稳定

Abstract：

Based on the poroelastic theory and the anisotropic linear elastic mechanics，and considering the influence of fluid components in porous media and coupled thermo-hydro-mechanical(THM) function，the porothermoelastic governing equations of anisotropic porous media is established. The constitutive equations and porothermoelastic mechanical model in borehole coordinates are obtained by adopting coordinate transformation methods under the assumption that shale formation is considered transverse isotropic media. The basic methods of solving are given by superposition principle，and the strength theory of weak plane is introduced to distinguish stability of shale formation. Finally，the accuracy of the model is verified by the stress distribution around a vertical borehole and the instance analysis of well W201–H1. The result shows that the calculated stress around the vertical borehole is completely consistent between conventional model and this new model(max. error is 0.03%)，and the analysis results of wellbore stability for well W201–H1 have a good consistency with practical situations. Conversely，the calculated results using conventional model will result in a large deviation，and the accuracy and reliability of the model are verified. As time goes on，the collapse areas around the borehole are gradually broadened and deepened. The anisotropic rock strength，anisotropic rock elasticity，seepage effects and heat-transfer effects around borehole are the important reasons affecting wellbore instability in shale formations. However，anisotropic rock strength is the main mechanism of borehole instability. Thus，it¢s necessary to consider the influence of shale anisotropy and coupled THM effects on borehole stability. The research results can provide a reference for borehole stability analysis and drilling in the gas shale formations.

Key words： rock mechanics shale porothermoelastic mechanics anisotropy transverse isotropy inclined well wellbore stability

引用本文:

马天寿，陈平. 页岩地层中孔隙热弹性井眼稳定力学模型[J]. 岩石力学与工程学报, 2015, 34(S2): 3613-3623.
MA Tianshou，CHEN Ping. POROTHERMOELASTIC MECHANICAL MODEL OF WELLBORE STABILITY IN SHALE FORMATIONS. , 2015, 34(S2): 3613-3623.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2013.1968 或 https://rockmech.whrsm.ac.cn/CN/Y2015/V34/IS2/3613

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