储层物性变化对天然气水合物分解的影响研究  

Study on the Influence of Reservoir Physical Property Change on the Decomposition of Natural Gas Hydrate

作　　者：张懿帆 徐顺义 陆祎晨 蒋海岩[1,2] 袁士宝 任梓寒[1,2] 王哲 ZHANG Yifan;XU Shunyi;LU Yichen;JIANG Haiyan;YUAN Shibao;REN Zihan;WANG Zhe(School of Petroleum Engineering,Xi'an Shiyou University,Xi'an,Shaanxi 710065,China;Shaanxi Key Laboratory of Special Stimulation Technology for Oil and Gas Fields,Xi'an,Shaanxi 710065,China;No.3 Gas Production Plant,Qinghai Oilfield Company,Petrochina,Dunhuang,Gansu 736200,China)

机构地区：[1]西安石油大学石油工程学院,陕西西安710065 [2]陕西省油气田特种增产技术重点实验室,陕西西安710065 [3]中国石油青海油田分公司采气三厂,甘肃敦煌736200

出　　处：《石油工业技术监督》2024年第12期40-46,共7页Technology Supervision in Petroleum Industry

基　　金：中国科学院天然气水合物重点实验室(中国科学院广州能源研究所)资助项目“热激励开采天然气水合物孔渗结构表征方法研究”(编号:E029kf1401)。

摘　　要：为了探明开采参数对天然气水合物开采的影响,深入了解水合物的分解机理,提高水合物的开采效率,基于Kim-Bishnoi水合物分解动力学方程建立了一维的水合物分解和储层参数演变的耦合模型,可实现快速分析储层参数和生产参数的变化对水合物分解的影响。研究结果表明:储层参数的变化本质是改变水合物反应的比表面积,影响分解速率以及储层其他参数最终影响分解效率;初始水合物饱和度越大,生产时间越长,累积产气量高;从分解动力学角度分析,有效渗透率的增加降低了反应比表面积,导致分解速率降低;生产压差、注入温度、反应频率因子都会直接影响分解速率和分解前缘移动速度,并呈正比率变化趋势。模型结果符合既往对水合物研究的认识,且能简捷快速分析地质和开采因素对其分解效果的影响。In order to find out the influence of mining parameters on gas hydrate exploitation,further understand the mechanism of hydrate decomposition,and improve the efficiency of hydrate exploitation,a one-dimensional coupling model of hydrate decomposition and reservoir parameter evolution was established based on the Kim-Bishnoi kinetic equation of hydrate decomposition,which can quickly analyze the influence of reservoir parameters and production parameters on hydrate decomposition.The results show that the essence of the change of reservoir parameters is to change the specific surface area of hydrate reaction,affect the decomposition rate and other parameters of the reservoir,and ultimately affect the decomposition efficiency.The higher the initial hydrate saturation,the longer the production time and the higher the cumulative gas production.From the perspective of decomposition kinetics,the increase of effective permeability decreases the specific surface area of the reaction,resulting in a decrease in the decomposition rate.Production pressure difference,injection temperature,reaction frequency factor will directly affect the decomposition rate and decomposition front moving speed,presenting the trend of positive ratio.The results of the model accord with the previous understanding of hydrate research,and can quickly and easily analyze the influence of geological and mining factors on the decomposition effect of hydrate.

关 键 词：天然气水合物 储层参数 生产参数 比表面积 动态预测 影响分析 

分 类 号：P618.13[天文地球—矿床学]