祁连山冻土区水合物多井系统降压联合热盐水增产数值模拟  

Numerical Study on Hot Brine Stimulation Combined Depressurization of Hydrate Reservoirs in a Multi-Well System in Permafrost Area of Qilian Mountain

作　　者：张婷婷[1,2] 李波[1,2] 韦文娜 Zhang Tingting;Li Bo;Wei Wenna(State Key Laboratory of Coal Mine Disaster Dynamics and Control,Chongqing University,Chongqing,400044;School of Resources and Safety Engineering,Chongqing University,Chongqing,400044)

机构地区：[1]重庆大学煤矿灾害动力学与控制国家重点实验室,重庆400044 [2]重庆大学资源与安全学院,重庆400044

出　　处：《当代化工研究》2023年第11期42-44,共3页Modern Chemical Research

基　　金：国家自然科学基金项目“低渗双重介质中水合物相变动力学及其控制机制研究”(项目编号:51876017)。

摘　　要：基于模拟软件TOUGH+HYDRATE对祁连山冻土区水合物藏的产气行为进行数值研究,采用五点水平井降压联合热盐水注入开采水合物藏,分析了储层关键物性参数的空间演化规律和产气产水以及能量效率等的变化规律。结果表明,生产前期热盐水的注入加快了产气速率。但后期热盐水可流经储层从生产井产出,限制了抑制剂在储层中的作用范围,使得水合物主要在降压和热刺激的作用下分解,产气速率也随之降低。此外,热盐水的注入可有效避免因二次水合物和冰的生成而抑制产气的现象。Based on the simulation software TOUGH+HYDRATE,the gas production behavior of hydrate reservoirs in the Qilian Mountain permafrost region was numerically studied.The five-point horizontal well depressurization combined with hot brine injection was used to exploit hydrate deposits.The spatial evolution law of key physical parameters of reservoir and the variation law of gas,water production and energy efficiency are analyzed.The results show that the injection of hot brine in the early stage accelerates the gas production rate.However,the hot brine can flow directly through the reservoir and be produced from production wells in the later stage,which limits the diffusion range of inhibitors in reservoir.The hydrate is mainly decomposed under the action of depressurization and thermal stimulation,and the gas production rate is also reduced.Meanwhile,the inhibition of gas production due to the formation of secondary hydrate and ice could be avoided by the hot brine injection.

关 键 词：天然气水合物 数值模拟 热盐水增产 降压 水平井 

分 类 号：TE[石油与天然气工程]