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首页> 外文期刊>Journal of Petroleum Science & Engineering >Wellbore stability analysis and breakout pressure prediction in vertical and deviated boreholes using failure criteria - A case study
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Wellbore stability analysis and breakout pressure prediction in vertical and deviated boreholes using failure criteria - A case study

机译：垂直井眼和偏斜井眼井壁稳定性分析及破裂压力预测-案例研究

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摘要

Wellbore instability is one of the most critical challenges that continuously appear in drilling and production operations. Borehole breakout, as the enlargement and elongation of a borehole in a preferential direction, is an important phenomenon which should be addressed when stability of the wellbore is analyzed. Breakout pressure is an important parameter in wellbore stability analysis. In this paper, a geomechanical model was constructed using several petrophysical, field and lab data for one formation of interest to evaluate in-situ and induced stresses. Three shear failure criteria, namely Mohr-Coulomb, Mogi-Coulomb and Hoek-Brown were used to predict the breakout pressure profile and the outcomes were validated with 4-arm caliper log data of the well. The effect of azimuth and inclination of the deviated wells on the breakout pressure was investigated using stress transformation equations. It was found that the Hoek-Brown failure criterion with optimized constants resulted in the best prediction of the breakout pressure for this particular case under study. As for the deviated wells, inclination had an increasing effect on the breakout pressure whereas azimuth relative to the maximum horizontal stress could counteract it. (C) 2016 Elsevier B.V. All rights reserved.
机译：井筒失稳是钻井和生产作业中不断出现的最关键的挑战之一。井壁破裂是井眼在优先方向上的扩大和伸长，它是一种重要现象，在分析井眼稳定性时应解决该问题。爆破压力是井筒稳定性分析中的重要参数。在本文中，使用了几个岩石物理，野外和实验室数据为感兴趣的地层构造了地质力学模型，以评估原位和诱发应力。使用三个剪切破坏准则，即Mohr-Coulomb，Mogi-Coulomb和Hoek-Brown来预测破裂压力曲线，并使用该井的4臂卡尺测井数据验证结果。使用应力转换方程研究了斜井的方位角和倾角对压裂压力的影响。研究发现，具有优化常数的Hoek-Brown破坏准则可以为研究中的这种特殊情况提供最佳的破裂压力预测。对于偏斜井，倾斜度对压裂压力有增加的影响，而相对于最大水平应力的方位角可以抵消它。 （C）2016 Elsevier B.V.保留所有权利。

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