Borehole stability build sections of horizontal wells for anisotropic coal seam
The objective existing in-situ stress field and the physical mechanical properties of rock are closely related to the borehole stability in petroleum engineering.However, in present engineering design, rock mass is simply treated as isotropic material.This method may be acceptable when the well is shallow, but for deep rock engineering, with the increase of drilling depth, the anisotropic properties of rock mass become stronger and need be considered.This paper sets out to further understand the actual situation of the well site taking anisotropy into account.It investigates the effect of the rock anisotropy in the stability and the stress distribution at the wall of various wellbores.The closed-form solution for stress distribution in transversely isotropic materials was used on the basis of rock experiments.A program was developed to compute the stress components at the inclined borehole wall whereby sensitivity analyses were performed to analyze the effect of the elastic moduli, stress anisotropy, arbitrary orientation of the borehole, the in-situ stress and the bedding inclination.Tensile and shear failure criteria were considered for the borehole stability analysis.
J.Zhao S.Z.Meng R.H.Mo
China United Coalbed Methane Co., Ltd, Beijing, China
国际会议
The 3rd ISRM Young Scholars Symposium on Rock Mechanics(第三届国际岩石力学青年学者论坛)
北京
英文
219-222
2014-11-08（万方平台首次上网日期，不代表论文的发表时间）