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首页> 外文会议>International Petroleum Technology Conference >Multidisciplinary Evaluation of Wellbore Instability in Shaly Sand Member Khafji Reservoir in Zuluf Field Saudi Arabia
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Multidisciplinary Evaluation of Wellbore Instability in Shaly Sand Member Khafji Reservoir in Zuluf Field Saudi Arabia

机译：Zuluf Field Saudi Arabia Shaly Sand Measure Khafji水库井眼不稳定的多学科评价

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This poster presents the results from a case study that integrates detailed rock mechanics and swelling tests with information from petrophysical logs and core properties acquired to evaluate, define and predict the instability mechanism in this portion of the Khafji reservoir. To achieve the objectives, 300 feet of preserved core were cut through the problematic shaly sand member using oil based mud. In addition, 200 conventional plugs and 28 whole core samples from eleven wells were utilized for the purpose of developing geomechanical and pore fluid models. Both oil based mud (OBM) and water based mud (WBM) filtrate were used for the swelling and triaxial compression tests. The development of a strength and stress profile for the well is the first step in understanding wellbore instability problems. These profiles are generated using rock properties, drilling experience, in-situ stress regimes and strength measurements on core samples. The results demonstrate that the in-situ stress in the Khafji reservoir can be characterized, and the critical azimuths of marked instability increase are discernible. Wellbore instability problems can be predicted and averted. The optimum mud weight windows to drill horizontal wells have been identified using the geomechanical model. Wells oriented parallel and perpendicular to maximum horizontal stress (SHmax) require minimum mud weight of 80-84 pcf and wells drilled WNW-ESE require mud weight from 80-95 pcf.. The swelling test results point toward increased swelling in the presence of the WBM filtrate compared to the OBM filtrate and a decrease in formation compressive strength when in contact with the OBM. It may therefore be prudent to redesign the already “inhibitive” WBM to suit the formation and the clays.
机译：该海报提出了一种案例研究的结果，该结果将详细的岩石力学和溶胀测试与来自岩石物理日志和获得的核心特性进行了信息，以评估，定义和预测该部分在Khafji储层中的该部分中的不稳定机制。为了实现目的，使用油基泥浆切割300英尺的保存核心。另外，来自11个井的200个常规塞和28个整个核心样本用于开发地质力学和孔隙流体模型的目的。油基泥浆（OBM）和水基泥浆（WBM）滤液用于溶胀和三轴压缩试验。井的强度和压力剖面的发展是了解井眼不稳定问题的第一步。这些配置文件是使用岩石属性，钻探体验，原位应力制度和核心样本的强度测量来产生的。结果表明，可以表征khafji储层的原位应力，并且可以辨别出明显不稳定的临界方位角。可以预测并避免井筒不稳定问题。使用地质力学模型识别了钻井水平井的最佳泥浆重量窗。平行的井，垂直于最大水平应力（SHMAX）需要最小的泥浆重量为80-84pCF，井钻头WNW-ESE需要泥浆重量从80-95 PCF。肿胀试验结果在存在的情况下增加肿胀增加与OBM滤液相比，WBM滤液与与OBM接触时的形成抗压强度的减少。因此，重新设计已经“抑制”WBM以适应形成和粘土可能是谨慎的。

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