天然气水合物稳定带内流体压裂计算的程序耦合方法  

Codes coupling method for simulating hydraulic fracturing within the gas hydrate stability zone

作　　者：刘金龙[1,2,3,4] 王淑红 Asiri Obeysekara[5] XIANG Jiansheng Pablo Salinas Christopher Pain Jonny Rutqvist 颜文 LIU Jinlong;WANG Shuhong;Asiri Obeysekara;XIANG Jiansheng;Pablo Salinas;Christopher Pain;Jonny Rutqvist;YAN Wen(CAS Key Laboratory of Ocean and Marginal Sea Geology,South China Sea Institute of Oceanology,Chinese Academy of Sciences,Guangzhou,China;Innovation Academy of South China Sea Ecology and Environmental Engineering,Chinese Academy of Sciences,Guangzhou 510301,China;Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou),Guangzhou 511458,China;University of Chinese Academy of Sciences,Beijing 100049,China;Applied Modelling and Computation Group,Department of Earth Science and Engineering,Imperial College London,Prince Consort Road,London SW72BP,UK;State Key Laboratory of Water Resources and Hydropower Engineering Science,Wuhan University,Wuhan 430072,China;Lawrence Berkeley National Laboratory,Berkeley,California,USA)

机构地区：[1]中国科学院边缘海与大洋地质重点实验室(南海海洋研究所),广东广州510301 [2]中国科学院南海生态环境工程创新研究院,广东广州510301 [3]南方海洋科学与工程广东省实验室(广州),广东广州511458 [4]中国科学院大学,北京100049 [5]Applied Modelling and Computation Group,Department of Earth Science and Engineering,Imperial College London,Prince Consort Road,London SW72BP,UK [6]State Key Laboratory of Water Resources and Hydropower Engineering Science,Wuhan University,Wuhan 430072,China [7]Lawrence Berkeley National Laboratory,Berkeley,California,USA

出　　处：《热带海洋学报》2020年第1期94-105,共12页Journal of Tropical Oceanography

基　　金：国家自然科学基金项目(41176052、41576035、41276050);南方海洋科学与工程广东省实验室(广州)人才团队引进重大专项(GML2019ZD0104);广东省自然科学基金面上项目(S2013010014523);中国科学院南海生态环境工程创新研究院创新发展基金项目(ISEE2018PY02);the U.S.Department of Energy(DE-AC02-05CH11231)~~

摘　　要：海洋天然气水合物稳定带气烟囱结构中存在被水合物充填的裂隙,表明在自然条件下沉积物中曾发生过流体压裂以及相关的流体流动和水合物形成。在水合物稳定带内实施人为的流体压裂工程,并联合其他方法(如降压或注热)进行水合物开采,有望提高开采效率。水合物稳定带内,无论是自然条件下发生的流体压裂过程,还是人为实施的流体压裂工程,都存在水合物反应和沉积物裂隙变形之间的耦合响应。当前,已有不少数值程序对水合物反应与沉积物弹塑性变形的耦合过程进行了定量研究,但尚没有数值程序能够计算水合物反应和离散裂隙变形之间的耦合过程。文章将TOUGH+Hydrate程序、IC-FERST和Solidity两者的耦合程序进行了进一步耦合,为水合物稳定带内的流体压裂计算提供了一种耦合计算方法,同时通过一个算例初步验证了该耦合计算方法的可行性。验证结果表明,该耦合计算方法经进一步改进后有望应用于定量研究水合物稳定带内的裂隙变形和水合物反应过程。Hydrates-filled discrete fractures have been observed within the gas chimney structure in marine gas hydrate stability zone worldwide.It indicates that naturally hydraulic fracturing process and stimulated fluid flow have occurred in the gas hydrate stability zone.Gas production can benefit from artificially hydraulic fracturing within the methane hydrate reservoir.There can be a change in fracture aperture during the gas production from the methane hydrate reservoir.In return,the evolution of the fracture network has effects on the gas production process.While quite a few researchers have developed codes for modelling the coupled process between hydrate dissociation and elastoplastic deformation,currently there is no numerical tool to investigate the coupled process between fracture network evolution and gas production.Here,we couple TOUGH+Hydrate codes with the already coupled IC-FERST and Solidity codes in order to simulate the hydraulic fracturing process within the gas hydrate stability zone.We run an example in which the pressure around a borehole will be increased to create hydraulic fracturing within the gas hydrate stability zone.The coupling method,with additional improvements in the future,can be used to simulate the coupled process between fracture network evolution and gas production.

关 键 词：天然气水合物 流体压裂 计算程序 程序耦合 

分 类 号：P736[天文地球—海洋地质]