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首页> 外文会议>Advances and experiences with pipelines and trenchless technology for water, sewer, gas, and oil applications >WELLBORE STABILITY RESEARCH TO THE LEVEL SECTION OFHORIZONTAL DIRECTIONAL DRILLING
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WELLBORE STABILITY RESEARCH TO THE LEVEL SECTION OFHORIZONTAL DIRECTIONAL DRILLING

机译：水平方向钻探水平段的井眼稳定性研究

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The problems such as sticking, tight pull when running casing occurred frequently inrnthe horizontal hole during horizontal directional drilling in sandstone reservoir of arncertain Bozhong block. Tests and theoretical analysis reveal that due to therncharacteristics of high porosity, high permeability, weak cementation and lowrnstrength, the sandstone reservoirs are subject to deformation under the effects ofrnearth stress. It is the dominant of the wellbore instability which can be prevented byrnusing proper drilling fluid density.rnThis paper is based on a linear elastic and isotropic mechanics for stress distributionrnaround direction wells and wellbore stability model is developed by comparing therncaving pressure and fracture pressure which varied with deviation angle and azimuth.rnConsidered the effect of sandstone viscosity-creep to the wellbore stabilityrnsimultaneously, based on the experimental results of the creep for sandstone in site,rnthe creep constitutive model and creep parameters is given. A numerical calculationrnof wellbore shrinkage rate is done by using FLAC3D code. From which the wellborerndeformation with time of horizontal well be concluded. The conclusion is that thernmajor cause of wellbore instability in horizontal section is the shear failure of sandrnstone, the effects of sandstone creep isn’t needed to be considered. Synthesized therntwo factors and fixed the proper drilling fluid density in the horizontal hole. And alsornmake the conclusion that the optimum drilling angle is the direction of the minimalrnhorizontal major stress.
机译：在阿尔伯特渤中区块砂岩储层水平定向钻井过程中，水平井钻进时经常在水平井孔中发生卡住，拉紧等问题。试验和理论分析表明，由于孔隙度高，渗透率高，胶结作用弱，强度低等特点，砂岩储层在地应力作用下会发生变形。这是通过适当的钻井液密度可以防止的井眼失稳的主要因素。rn本文基于线性弹性和各向同性力学原理，围绕方向井进行应力分布，并通过比较随压力变化的崩落压力和压裂压力建立了井眼稳定性模型。同时考虑了砂岩黏度蠕变对井筒稳定性的影响，在现场砂岩蠕变试验结果的基础上，给出了蠕变本构模型和蠕变参数。井眼收缩率的数值计算是通过使用FLAC3D代码完成的。由此可以得出水平井随时间的井眼变形。结论是，水平断面井眼失稳的主要原因是砂岩的剪切破坏，不需要考虑砂岩蠕变的影响。综合了这两个因素，并在水平井中固定了适当的钻井液密度。并得出结论，最佳钻孔角度是最小水平主应力方向。

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