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Alternative method to determine the uniaxial-strain compressibility of cohesive sandstone
Géotechnique ( IF 5.8 ) Pub Date : 2020-09-14 , DOI: 10.1680/jgeot.18.p.243
Sander Hol 1 , Arjan van der Linden 1
Affiliation  

Compaction and subsidence risk related to hydrocarbon production are frequently assessed using Geertsma models. The underlying theory assumes linear poroelastic reservoir rock to compress by pore pressure depletion under uniaxial-strain conditions. Adequate mechanical testing techniques have been developed to measure the uniaxial-strain compressibility, although the execution of these methods is technically difficult and requires a significant level of experience. In this paper, a simplified technique is proposed to approximate the compressibility from triaxial strain data, which is different from earlier hydrostatic stress/uniaxial-strain conversion approaches. The method is applied to Berea outcrop sandstone and Groningen reservoir material, employing pore pressure depletion protocols under triaxial stress and uniaxial-strain boundary conditions. By interpolation of triaxial stress–strain data and adopting linear poroelastic theory, the uniaxial-strain compressibility required for the application of the Geertsma model is yielded. This does not require a priori information of elastic constants. Moreover, the interpolation technique allows for an independent check of the technical performance of the radial strain control system. The method holds for rocks that are close to linear poroelastic, subjected to stress conditions below the critical state line.

中文翻译:

确定粘性砂岩单轴应变可压缩性的替代方法

经常使用Geertsma模型评估与油气生产有关的压实和沉陷风险。基本理论假设线性多孔弹性储层岩石在单轴应变条件下会因孔隙压力耗竭而压缩。已经开发了足够的机械测试技术来测量单轴应变的可压缩性,尽管执行这些方法在技术上是困难的,并且需要大量经验。在本文中,提出了一种简化的技术来从三轴应变数据近似可压缩性,这与早期的静水压力/单轴应变转换方法不同。该方法适用于Berea露头砂岩和Groningen储层材料,在三轴应力和单轴应变边界条件下采用孔隙压力消耗方案。通过插值三轴应力-应变数据并采用线性多孔弹性理论,得出了应用Geertsma模型所需的单轴应变可压缩性。这不需要弹性常数的先验信息。此外,插值技术允许对径向应变控制系统的技术性能进行独立检查。该方法适用于接近线性多孔弹性且在临界状态线以下承受应力条件的岩石。插值技术可以独立检查径向应变控制系统的技术性能。该方法适用于在临界状态线以下承受应力条件的接近线性多孔弹性的岩石。插值技术可以独立检查径向应变控制系统的技术性能。该方法适用于接近线性多孔弹性且在临界状态线以下承受应力条件的岩石。
更新日期:2020-09-14
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