Masoud Ziaie , Amirhossein Takmili , Saeid Sadeghnejad , Mehdi Hakimzadeh
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摘要

对以往钻井所获数据的分析在提高作业安全性和降低钻井成本方面发挥着至关重要的作用。其中一个关键方面是采用地质力学模型,为预测孔隙压力、确保井眼稳定性和优化套管安放提供有价值的见解。本研究的重点是为一个油田的三口油井开发一个综合地质力学模型,尤其关注两个不同地层的孔隙压力变化。在覆盖层区观察到异常压力,而在储层区则观察到正常压力。所有相关数据源,包括全套测井记录、偶极子剪切声波成像仪报告、图像记录、钻井作业数据和测试泄漏,都被组合起来作为地质力学模型的输入。这项研究的主要目的是研究异常和正常孔隙压力区内岩石的地质力学行为。通过图像测井和卡尺测井数据来确定突破点,从而提供最小水平应力的方向。随后,整个地质力学模型将根据这些识别点进行调整和验证。此外,最小水平应力的校准是通过分析测试数据的泄漏来完成的。这项研究的主要发现表明,储层不同点的水平应力方向各不相同。根据图像测井解释结果,1#井的最小水平应力方向为 145°,2#井为 125°,3#井为 115°。此外,异常孔隙压力的存在导致应力机制从正应力机制转变为走向滑移或反向应力机制。1 号井符合走向滑动机制,井筒稳定方位角分别为 30、70、210 和 250°。2 号井和 3 号井呈现反向应力状态。油井的最稳定状态与最大水平应力方位角一致。最后,与莫尔-库仑准则相比,莫吉-库仑准则和修正的拉德破坏准则在识别岩石剪切破坏方面表现出更高的准确性。通过整合各种输入数据并采用综合验证方法,我们的模型成为了解和预测钻井作业中地质力学不稳定性的可靠工具。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Integrated geomechanical analysis of shear failure wellbore instability in abnormal and normal pore pressure zones using diverse input data: A case study
The analysis of data obtained from previous drilled wells play a crucial role in enhancing the operational safety and reducing drilling expenses. A pivotal aspect of this lies in employing a geomechanical model, offering valuable insights into predicting pore pressure, ensuring borehole stability, and optimizing casing placement. This study centers on developing an integrated geomechanical model for three wells within an oil field, especially focusing on pore pressure variations in two distinct formations. An abnormal pressure is observed at overburden zone, while the reservoir zone is characterized by a normal pressure behavior. All relevant data sources including full set logs, dipole shear sonic imager reports, image logs, drilling operation data, and leak of tests are combined as an input to the geomechanical model. The main purpose of this study is to examine the geomechanical behavior of rocks within both abnormal and normal pore pressure zones. Identification of breakout points is achieved through image logs and caliper log data, which results in providing the direction of the minimum horizontal stress. Subsequently, the entire geomechanical model undergoes adjustment and validation based on these identified points. Moreover, the calibration of minimum horizontal stress is accomplished by analyzing the leak of test data. The main finding of this study indicates that the direction of the horizontal stresses varies across different points of the reservoir. Based on the results of the image log interpretation, the minimum horizontal stress direction in well#1 is 145°, in well #2, 125°, and in well# 3, 115°. Moreover, the presence of abnormal pore pressure results in a shift in the stress regime from a normal to strike slip or reverse stress regimes. In Well#1 conforms to a strike-slip regime with wellbore stable azimuths at 30, 70, 210, and 250°. Well#2 and Well#3 exhibit a reversed regime. The well's most stable state aligning with the azimuth of maximum horizontal stress. Lastly, it is determined that the Mogi-Coulomb and the modified Lade failure criterion exhibit superior accuracy in identifying shear failure of rocks when compared to the Mohr-Coulomb criterion. By integrating diverse input data and employing comprehensive validation methods, our model emerges as a robust tool for understanding and predicting geomechanical instability in drilling operations.
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