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首页> 外文会议>SPE/ISRM rock mechanics conference (Oil Rock 2002) >Discrete Element Approach for the Wellbore Instability of Laminated and Fissured Rocks
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Discrete Element Approach for the Wellbore Instability of Laminated and Fissured Rocks

机译：层状裂隙岩体井筒失稳的离散元方法

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摘要

A laminated and fissured formation around a horizontalrnborehole is modeled as a combination of intact rock blocksrnand permeable fractures with a DEM code. The model is usedrnfor understanding the mechanism of rock failure problemsrnobserved in a shale formation of an offshore field. Differentrnmud weights and stress conditions are applied to the model tornsimulate the rock failure around deviated holes in laminatedrnand fissured shale.rnThe numerical simulation shows that shear failure alongrnthe bedding planes is the predominant mode of collapse of thernhole when mud under pressures penetrate into bedding planesrnon which shear stress is applied. The severity of wellborerninstability varies with stress states and wall conditions. Therneffect of a plugging agent in mud is verified by comparisonrnbetween permeable and impermeable wellbore models.
机译：将水平钻孔周围的层状裂隙地层建模为完整岩石块和可渗透裂缝与DEM代码的组合。该模型用于理解近海油田页岩地层中岩石破坏问题的机理。该模型采用了不同的泥浆权重和应力条件，模拟了层状裂隙页岩偏心孔周围的岩石破坏。数值模拟表明，当压力作用下泥浆渗入层理平面时，沿层理面的剪切破坏是孔洞塌陷的主要方式。施加压力。井壁不稳定的严重程度随应力状态和井壁条件而变化。通过在可渗透井眼​​与不可渗透井眼​​模型之间进行比较，验证了堵漏剂在泥浆中的作用。

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