3D CFD-DEM modeling of sand production and reservoir compaction in gas hydrate-bearing sediments with gravel packing well completion

IF 5.3 1区 工程技术 Q1 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS Computers and Geotechnics Pub Date : 2024-11-05 DOI:10.1016/j.compgeo.2024.106870
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Abstract

Sand production is one of the bottlenecks restricting the safe, efficient, and controllable production of hydrates. Enhancing the understanding of mesoscopic sand production responses is essential for sand production risk management. Yet, existing mesoscopic sand production models inadequately capture the effects of hydrate cementation, resulting in an incomplete assessment of the mechanical impacts of hydrates on sand production. Herein, we developed a new three-dimensional model for sand production in gas hydrate-bearing sediments (GHBSs) with gravel packing well completion, utilizing the coupled computational fluid dynamics and discrete element method (CFD-DEM). The model considers the coupled interactions of mechanical weakening and permeability variation in GHBSs caused by hydrate cementation reduction. Simulations are analyzed to clarify the responses of sand production and reservoir compaction under the coupled mechanical, hydraulic, and sand control completion in GHBSs during depressurization. The high fluid flow rate induced by a high production pressure differential can promote sand production and reservoir compaction. Additionally, the high effective stress and high hydrate dissociation rate induced by a high production pressure differential are beneficial for initial sand production, but they can also prematurely lead to gravel packing layer obstruction, inhibiting the final sand production. This also results in a dual impact on compaction deformation, enhancing it through compaction while decelerating it by inhibiting sand production. This work provides a viable simulation idea and preliminary insights into the mechanism of sand production from GHBSs.
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含天然气水合物沉积物中含砾石填料完井的产砂和储层压实三维 CFD-DEM 模型
砂生产是制约水合物安全、高效和可控生产的瓶颈之一。加强对中观产砂反应的了解对于产砂风险管理至关重要。然而,现有的中观机制砂生产模型未能充分捕捉水合物胶结的影响,导致无法全面评估水合物对机制砂生产的影响。在此,我们利用计算流体动力学和离散元耦合方法(CFD-DEM),为含天然气水合物沉积(GHBSs)和砾石填料完井开发了一种新的三维产砂模型。该模型考虑了水合物胶结减少造成的 GHBSs 机械削弱和渗透率变化的耦合相互作用。通过模拟分析,阐明了减压过程中 GHBSs 中机械、水力和防砂完成耦合作用下的产砂和储层压实响应。高生产压差引起的高流体流速可促进产砂和储层压实。此外,高生产压差引起的高有效应力和高水合物解离率有利于初期产砂,但也会过早导致砾石填料层阻塞,抑制最终产砂。这也会对压实变形产生双重影响,一方面通过压实增强变形,另一方面通过抑制产砂减缓变形。这项工作为 GHBS 的产砂机制提供了可行的模拟思路和初步见解。
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来源期刊
Computers and Geotechnics
Computers and Geotechnics 地学-地球科学综合
CiteScore
9.10
自引率
15.10%
发文量
438
审稿时长
45 days
期刊介绍: The use of computers is firmly established in geotechnical engineering and continues to grow rapidly in both engineering practice and academe. The development of advanced numerical techniques and constitutive modeling, in conjunction with rapid developments in computer hardware, enables problems to be tackled that were unthinkable even a few years ago. Computers and Geotechnics provides an up-to-date reference for engineers and researchers engaged in computer aided analysis and research in geotechnical engineering. The journal is intended for an expeditious dissemination of advanced computer applications across a broad range of geotechnical topics. Contributions on advances in numerical algorithms, computer implementation of new constitutive models and probabilistic methods are especially encouraged.
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