Modelling Geomechanical Impact of CO2 Injection and Migration Using Precomputed Response Functions

O. Andersen, H. Nilsen, S. Gasda
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引用次数: 5

Abstract

When injecting CO2 or other fluids into a geological formation, pressure plays an important role both as a driver of flow and as a risk factor for mechanical integrity. The full effect of geomechanics on aquifer flow can only be captured using a coupled flow-geomechanics model. In order to solve this computationally expensive system, various strategies have been put forward over the years, with some of the best current methods based on sequential splitting. In this present work, we seek to approximate the full geomechanics effect on flow without the need of coupling with a geomechanics solver during simulation. We do this by means of precomputed pressure response functions. At grid model generation time, a geomechanics solver is used to compute the mechanical response of the aquifer for a set of pressure fields. The relevant information from these responses is then stored in a compact form and embedded with the grid model. We test the accuracy and computational performance of our approach on a simple 2D model and a more complex 3D model, and compare the results with those produced by a fully coupled approach as well as from as simple decoupled method based on Geertsma's uniaxial expansion coefficient.
利用预先计算的响应函数模拟CO2注入和运移的地质力学影响
当向地质地层注入二氧化碳或其他流体时,压力既是流体的驱动因素,也是机械完整性的风险因素。地质力学对含水层流动的全面影响只能通过流动-地质力学耦合模型来捕捉。为了解决这个计算量大的系统,多年来提出了各种各样的策略,其中一些目前最好的方法是基于顺序分裂的。在目前的工作中,我们试图在模拟过程中不需要与地质力学求解器耦合的情况下近似地模拟地质力学对流动的全部影响。我们通过预先计算的压力响应函数来做到这一点。在网格模型生成时,使用地质力学求解器计算一组压力场下含水层的力学响应。然后将这些响应的相关信息存储在紧凑的形式中,并嵌入到网格模型中。我们在一个简单的2D模型和一个更复杂的3D模型上测试了我们方法的精度和计算性能,并将结果与完全耦合方法以及基于Geertsma单轴膨胀系数的简单解耦方法进行了比较。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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