天然气水合物开发多物理场特征及耦合渗流研究进展与建议  

ADVANCES AND RECOMMENDATIONS FOR MULTI-FIELD CHARACTERISTICS AND COUPLING SEEPAGE IN NATURAL GAS HYDRATE DEVELOPMENT

作　　者：李淑霞[1] 郭尚平[2] 陈月明[1] 张宁涛 武迪迪 Li Shuxia;Guo Shangping;Chen Yueming;Zhang Ningtao;Wu Didi(School of Petroleum Engineering,China University of Petroleum,Qingdao 266580,China;Research Institute of Petroleum Exploration and Development,Beijing 1000X3,China)

机构地区：[1]中国石油大学(华东)石油工程学院,青岛266580 [2]中国石油勘探开发研究院,北京100083

出　　处：《力学学报》2020年第3期828-842,共15页Chinese Journal of Theoretical and Applied Mechanics

基　　金：国家自然科学基金(51991360,51991365);国家重点研发计划(2016YFC0304005)资助项目

摘　　要：天然气水合物作为一种非常规的清洁能源,在全球分布广、资源量大.自20世纪90年代以来,加拿大、美国、日本、中国已经先后进行了陆域及海域的水合物试采,但发现出砂、单井日产气量低、稳产时间短等问题,试采产量远不能满足商业化开发的需求,其中核心问题是对水合物开发过程中的相变、多相多组分多场耦合渗流特征的认识不够明晰.本文根据天然气水合物开发过程中涉及的渗流场、温度场、化学场、力学场等多场耦合特征,重点综述水合物生成/分解对各物理场主要特征参数的影响,包括水合物储层的孔隙度、水合物饱和度、渗透率、相对渗透率等基础物性参数及其动态演变,天然气水合物的导热系数、比热容、热扩散系数以及水合物生成/分解热等热力学参数,天然气水合物生成、分解动力学特征,纯水合物以及含水合物沉积物的力学性质等,最后阐述了天然气水合物开发渗流中的多场耦合关系及相互作用,提出了今后水合物开发多物理场特征及耦合渗流的科学研究、技术开发的有关建议.As an unconventional, clean energy resource, natural gas hydrate is abundant and widely distributed in the subsea and permafrost area. Since the 1990 s, permafrost and ocean hydrate production tests have been conducted successively by Canada, the United States, Japan and China. However, many problems such as the producing of sand, low gas production rate and very short stable production time of single well have been found during the production tests. The gas production rate was much less than the demand of the commercial exploitation. The main challenge is that the mechanism of hydrate dissociation,multi-phase,multi-component and multi-field coupling seepage characteristics in the process of hydrate exploitation still remain unclear.According to the multi-field coupling characteristics of hydraulic field,thermal field,chemical field and mechanical field involved in the development of natural gas hydrate,this paper summarizes the effects of hydrate formation/decomposition on the main characteristic parameters of each physical field,including the basic physical parameters of hydrate reservoirs and their dynamic evolution(porosity,hydrate saturation,permeability and relative permeability),thermodynamic parameters(thermal conductivity,specific heat,thermal diffusivity and heat of formation/decomposition of hydrate),kinetic characteristics of hydrate formation and decomposition,mechanical properties of pure hydrate and hydrate-bearing sediments.Finally,the multi-field coupling relationship and interaction in the seepage of natural gas hydrate development are reviewed,and suggestions for the future scientific research and technology development of multi-physics characteristics and coupling seepage in hydrate development are put forward.

关 键 词：天然气水合物 开发 渗流 多场耦合 

分 类 号：TE312[石油与天然气工程—油气田开发工程]