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Constitutive modeling of rocks and numerical simulation of oil reservoirs exhibiting pore collapse.

机译：岩石的本构模型和表现出孔隙塌陷的油藏的数值模拟。

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摘要

The problems related to reservoir compaction and surface subsidence caused by the pore collapse occurring in reservoir rocks were analysed through the development of a numerical simulator.;A generalized constitutive model was developed to characterize the stress-strain and volumetric response of rocks. The material parameters employed by the model were determined using simple laboratory data and Simplex optimization procedure. To validate the model, an experimental program was conducted on Berea sandstone to procure data along different stress paths with special emphasis on eliminating the end effects. In view of the stress conditions existing in a depleting reservoir and due to non-availability of data on actual reservoir rocks along different stress paths, the constitutive model was modified to obtain a simple and practical model, called the pore collapse model, for describing the non-linear behavior of reservoir rocks exhibiting pore collapse.;Both versions of the constitutive model were implemented in an existing non-linear finite element simulator, MICROFEM. MICROFEM was extensively modified to include the axisymmetric idealization of the domain and special loading conditions such as those associated with gravity loading, in situ pore pressure, and pore pressure depletion. The modified version of the simulator, called as NARCASS, was tested through successful simulation of laboratory tests representing field loading conditions.;Using the developed simulator, a detailed analysis was conducted for the Ekofisk field. Comparisons between available field data and simulator results indicated that the simulator can be used successfully to predict subsidence, subsidence rate, subsidence bowls, and stress ratio in the reservoir. Based on the results obtained, recommendations are made to elevate the platform and to perform a comprehensive study on the stability of casings to avoid problems during the future operations of the field.;The simulator can be used during the planning stages of the reservoir development to assess the field changes associated with the production and to determine the effects of various depletion scenarios and enhanced recovery techniques such as gas injection and water flooding on the field deformations.
机译：通过数值仿真器的开发，分析了储层岩石发生孔隙塌陷引起的与储层压实和地表塌陷有关的问题。建立了广义本构模型，表征了岩石的应力应变和体积响应。使用简单的实验室数据和Simplex优化程序确定模型采用的材料参数。为了验证该模型，在Berea砂岩上进行了一个实验程序，以获取沿不同应力路径的数据，并特别着重于消除最终影响。鉴于枯竭油藏中存在的应力条件，以及由于沿不同应力路径的实际油藏岩石数据不可用，修改了本构模型，得到了一种简单实用的模型，称为孔隙塌陷模型，用于描述油藏破裂。储层岩石的非线性行为表现出孔隙塌陷。本构模型的两个版本都在现有的非线性有限元仿真器MICROFEM中实现。 MICROFEM进行了广泛的修改，以包括区域的轴对称理想化和特殊的加载条件，例如与重力加载，原位孔隙压力和孔隙压力耗竭相关的条件。通过成功模拟代表现场载荷条件的实验室测试，对模拟器的改进版本NARCASS进行了测试。使用开发的模拟器，对Ekofisk领域进行了详细的分析。可用的现场数据和模拟器结果之间的比较表明，该模拟器可以成功地用于预测储层中的沉降，沉降率，沉降碗和应力比。根据获得的结果，提出了提升平台和对套管稳定性进行全面研究的建议，以避免在油田未来的运营中出现问题。该模拟器可在油藏开发的规划阶段用于评估与生产相关的田间变化，并确定各种枯竭方案和提高采收率技术（例如注气和注水）对田间变形的影响。

著录项

  • 作者

    Abdulraheem, Abdulazeez.;

  • 作者单位

    The University of Oklahoma.;

  • 授予单位 The University of Oklahoma.;
  • 学科 Engineering Civil.;Environmental Sciences.
  • 学位 Ph.D.
  • 年度 1994
  • 页码 378 p.
  • 总页数 378
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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