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首页> 外文会议>SPE/ISRM rock mechanics conference (Oil Rock 2002) >Borehole Design: Stability Considerations
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Borehole Design: Stability Considerations

机译：钻孔设计：稳定性考虑

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In recent years drilling for hydrocarbons have become a muchrnmore challenging task as nice, blanket-type reservoirs are nowrnpart of history and appear mostly in textbooks and old reports.rnThe current economic and political world environmentrndemands fewer, more “difficult” wells to be drilled andrnproduced. Wellbore stability problems account for huge overcostsrnworldwide.rnTectonically active areas, thin interlayered horizons,rnunconsolidated rocks; deep and hot formations are part of therngeological environments where hydrocarbons are currentlyrnproduced from. The degree of planning and problemrnanticipation at both drilling and production stages willrndetermine the difference between a productive reservoir and arntechnical/economical failure.rnIn the literature, some specific cases have been analyzedrnbut the lack of a more general methodology for wellborerndesign is a problem that needs to be addressed. The vastrnmajority of models utilize two-dimensional (2D) descriptionsrnof the problem in order to determine the best well trajectoryrnfrom a geomechanical point of view. In this paper, severalrnsituations are presented, where different stress field patternsrnwere assumed for different rock types. The generality of thisrnstudy provides a tool for well design under different stressrnenvironments. The maximum principal stress was allowed tornfollow different directions in different planes (horizontal,rnvertical and inclined) depending upon the case being analyzed.rnThe model represents wellbores drilled in shallow,rnmedium-deep, and deep basins. The effect of both differentialrnstress and loads magnitude were evaluated throughout thisrnwork.rnThe model developed here was based on the finite elementrnmethod, for both linear-elastic and elasto-plastic materials.rnThe description of the problem is a fully three-dimensionalrn(3D) representation of the wellbore and the applied stresses.rnThis paper has two parts: a theoretical approach, whichrnprovides the basis for the solution setup, and a set ofrnnumerical experiments with their correspondent results. Sincernseveral real-life situations were evaluated, the potentialrnapplicability of the results obtained here is apparent; and thernresults of these simulations could be used as a cross check forrncalculations made for more particular situations in the field.rnThe aim of this work is to provide a more global vision of therneffects of stress variations upon the optimum design of oil andrngas wells.
机译：近年来，钻探碳氢化合物已成为一项更具挑战性的任务，因为精细的毯状储层已经成为历史的一部分，并且大多出现在教科书和旧报告中。rn当前的经济和政治世界环境要求的钻探和生产的井越来越少，“难度更大” 。井筒稳定性问题造成了全球范围内的巨额超额成本。rn构造活动区，层间薄层，松散固结的岩石；深部和高温地层是目前生产碳氢化合物的地质环境的一部分。在钻探和生产阶段的计划和问题预期程度将决定生产性油藏与技术/经济故障之间的区别。在文献中，已经分析了一些具体案例，但是缺乏井眼设计的更通用方法是一个需要解决的问题。被解决。绝大多数模型利用二维（2D）描述来解决该问题，以便从地质力学的角度确定最佳井眼轨迹。本文介绍了几种情况，其中针对不同的岩石类型假设了不同的应力场模式。本研究的一般性为在不同应力环境下​​进行油井设计提供了一种工具。根据所分析的情况，允许最大主应力沿不同方向（水平，垂直和倾斜）沿不同方向撕裂。该模型表示在浅，中，深和深盆地中钻的井眼。在整个工作过程中评估了应力和载荷大小的影响。这里开发的模型基于有限元方法，适用于线弹性和弹塑性材料。问题的描述是完全三维的（3D）表示本文分为两个部分：一种理论方法，为解决方案的建立提供了基础；以及一组数值实验，并给出了相应的结果。由于评估了几种现实生活情况，因此这里获得的结果的潜在适用性显而易见。这些研究的结果可以用作针对现场特定情况进行的交叉检查计算。这项工作的目的是为应力变化对石油和天然气井的优化设计带来的影响提供更全面的了解。

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