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Flow simulation in a deepwater reservoir: Fault leakage analysis.

机译：深水库中的流动模拟：故障渗漏分析。

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摘要

Proper modeling of water injection projects in undeveloped deepwater reservoirs is important not only from a recovery factor point of view, but also for environmental protection purposes. Around the world some wells producing from reservoirs under water injection were shut down because of oil leakage to sea. Oil reservoirs with major faults that communicate the reservoir to the seabed are sensitive to water injection projects. Oil companies' common practice is to reuse the produced water and to reinject it into the reservoir. This procedure may cause pressure increase, and also may result in fault slip and communication through the fault from the reservoir to the seabed. Therefore, the flow simulation must consider concepts of shear and effective normal stress to estimate the maximum allowed pressure that generate slip in the fault, and, consequently, leakage to the seafloor. The main objective of this research is to explore the production uncertainties in an undeveloped oil reservoir, under water injection project, with a major internal fault, and the role of geomechanics in the fault reactivation.;This research developed a new external iterative computational program applied to complex geological geometry that updates geomechanical information for each cell grid, for each time-step and during each Newton's iteration, to estimate the maximum pressure allowed to safely operate a water injection project without any oil leakage to the sea. This new methodology links two commercial simulators: one that emphasizes flow through porous media aspects, and the other that focuses on the geomechanical behavior. For this particular field, the maximum allowed water injection pressure was estimated in a value similar to the initial reservoir pressure. Sensitivity analyses of reservoir temperature, injection pressure and well location on the fault were carried out, and a comprehensive stress map and oil leakage variation, associated with flow through the fault, was also obtained. The investigations were limited to numerical simulations, but they used seven triaxial laboratory tests performed in Brazil as support information.
机译：在未开发的深水水库中，对注水项目进行正确的建模不仅从恢复因子的角度考虑，而且对于环境保护也很重要。在世界范围内，由于向海洋漏油，一些在注水作用下从储层开采的油井被关闭。将主要储层连通海底的重大断层储油层对注水工程很敏感。石油公司的常规做法是回用采出水并将其重新注入储层。此过程可能导致压力增加，还可能导致断层滑动以及通过断层从储层到海床的连通。因此，流动模拟必须考虑剪切力和有效法向应力的概念，以估计在断层中产生滑动并因此泄漏到海底的最大允许压力。这项研究的主要目的是探索一个注水项目未开发的，内部有重大断层的油藏的生产不确定性，以及地质力学在断层活化中的作用。复杂的地质几何形状，可以更新每个单元网格，每个时间步长和每个牛顿迭代期间的地质力学信息，以估计安全操作注水项目而不会向海漏油的最大压力。这种新方法将两个商业仿真器联系在一起：一个强调多孔介质的流动，另一个强调地质力学行为。对于该特定领域，估计的最大允许注水压力与初始储层压力相似。进行了储层温度，注入压力和断层井位置的敏感性分析，并获得了与断层流相关的综合应力图和漏油变化。研究仅限于数值模拟，但是他们使用了在巴西进行的七项三轴实验室测试作为支持信息。

著录项

  • 作者

    Rodrigues, Luis Glauber.;

  • 作者单位

    University of Alberta (Canada).;

  • 授予单位 University of Alberta (Canada).;
  • 学科 Engineering Petroleum.
  • 学位 Ph.D.
  • 年度 2009
  • 页码 300 p.
  • 总页数 300
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 老年病学;
  • 关键词

  • 入库时间 2022-08-17 11:38:19

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