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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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

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	MA Tianshou
	CHEN Ping

Cite this article:

MA Tianshou,CHEN Ping. POROTHERMOELASTIC MECHANICAL MODEL OF WELLBORE STABILITY IN SHALE FORMATIONS[J]. , 2015, 34(S2): 3613-3623.

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

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