尼日尔三角洲钻井作业中确定安全泥浆比重窗口的岩石破坏模型评价

Chioma Ogbechie Success
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引用次数: 1

摘要

由于拉伸和剪切破坏导致的不稳定钻孔会导致严重的钻井问题。为了减轻或防止井眼破坏,这增加了油田的非生产时间和恢复失败井的成本,已经开发了不同的岩石强度标准模型来预测所需的最佳泥浆比重,但不幸的是,考虑到不同的钻井条件,并非所有模型都适合所有地层。因此,需要对这些模型进行评估,以检验其在尼日尔三角洲钻井稳定井中的有效性和准确性。为了实现这一目的,利用从三种破坏准则模型中导出的公式方程,计算确定泥浆比重窗口上下边界的崩溃和破裂压力;Hoek-Brown破坏准则、Mohr-Coulomb破坏准则和Mogi-Coulomb破坏准则。这是使用Microsoft Excel实现的,并在一个图上进行模拟,以显示每个模型的不同泥浆窗口以进行比较。与本研究相关的输入参数是孔隙压力、地应力数据和岩石力学特性,这些数据来自尼日尔三角洲xxx-陆上油田的一个高压带。将预测的最佳泥浆比重与实际的泥浆比重随深度的变化进行比较,以检查每个模型的准确性,从而得出最适合该油田地层的失效准则。结果表明,Hoek-Brown破坏准则给出的结果不切实际,在钻孔时将导致井眼破裂。Mohr-Coulomb准则和3D Mogi-Coulomb准则给出了类似的结果,可以使用,但由于考虑了中间主应力对岩石强度的影响,相对于保守的Mohr-Coulomb准则,建议使用Mogi-Coulomb准则钻井稳定直井。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Evaluation of Rock Failure Models for The Determination of a Safe Mud Weight Window During Drilling Operations in The Niger Delta
Unstable boreholes due to tensile & shear failure results in serious drilling problems. This increases the non-productive time spent in the field and the cost of reviving failed wells in the oil and gas industry in order to mitigate or prevent borehole failure, different rock strength criteria models have been developed to predict the optimum required mud weight but unfortunately, not all models fit for all formation considering the different drilling conditions, hence these models need to be evaluated to check their validity and accuracy for drilling stable wells in the Niger Delta. To achieve this purpose, collapse and fracture pressure that defines the lower and upper boundary of a mud weight window are calculated using derived formula equations from three failure criteria models; Hoek-Brown failure criterion, Mohr-Coulomb failure criterion and Mogi-Coulomb criterion failure criterion. This is achieved using Microsoft Excel and the simulation is done on a plot to show the different mud window by each model for comparison. The input parameters relevant for this study are pore pressure, in-situ stress data and rock mechanical properties which were acquired from a high-pressured zone in an xxx-onshore oilfield of the Niger Delta. A plot of the predicted optimum mud weight vs the actual mud weight against depth is compared to check the accuracy of each model to conclude on the failure criterion that is best fit for the formation in this field. The results showed that Hoek-Brown failure criterion gave an unrealistic outcome, when used to drill will lead to borehole breakout. Mohr-Coulomb and 3D Mogi-Coulomb criteria gave similar results which can be used but Mogi-Coulomb is recommended for drilling stabilized vertical wells due to the consideration of intermediate principal stress effect on rock strength over the conservative Mohr-Coulomb.
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