热水驱替开采Ⅱ类水合物藏规律研究  

Study of production of ClassⅡhydrate reservoir by hot water flooding

作　　者：夏志增 王学武[1] 时凤霞[1] 郭瑾[1] XIA Zhizeng;WANG Xuewu;SHI Fengxia;GUO Jin(China University of Petroleum,College of Shengli,Dongying 257061,China)

机构地区：[1]中国石油大学胜利学院,东营257061

出　　处：《海洋地质与第四纪地质》2020年第2期158-164,共7页Marine Geology & Quaternary Geology

基　　金：国家科技重大专项项目“典型超低渗透油藏不同注入介质动用界限研究”(2017ZX05013-001);中国石油大学胜利学院校级项目“CO2置换开采天然气水合物藏数值模拟研究”(KY2018018)。

摘　　要：天然气水合物广泛分布于陆地冻土带和深海地层,资源潜力巨大,其中Ⅱ类水合物藏占有重要地位。为加强对Ⅱ类水合物藏开采规律的认识,结合实际水合物藏参数,使用数值模拟方法研究了热水驱替开采Ⅱ类水合物藏的动态规律,并与降压法的开采效果进行了对比分析。结果表明:①热水驱替开采Ⅱ类水合物藏时,产气速率和分解气速率首先快速上升,然后以较快速度下降至趋于相对稳定;累产气和累分解气上升较快;气体采出程度和水合物分解程度均处于较高水平(>60%)。②热水驱替对Ⅱ类水合藏的开采具有一定的适应性,与降压法开采相比,热水驱替方式下储层水合物的分解更彻底,气体采出程度、水合物分解程度也更优,但具有较低的累积气水比,产水量较大。As a kind of new energy source,natural gas hydrates are widely distributed in both permafrost and deep ocean sediments.Among different types of hydrate reservoirs,the ClassⅡhydrate reservoir is the most prevalent production target.In order to study the behavior of the ClassⅡhydrate reservoir in production,this paper investigated the hydrate reservoir production using the hot water flooding method according to the parameters reported in literatures.The results are compared with those by the depressurization method.The results show:1)when the ClassⅡhydrate reservoir is developed by hot water flooding,the gas production rate increases rapidly in the early stage,and then declines until it reaches a relatively stable level.The gas dissociation rate varies similarly to the gas production rate.The cumulative produced gas and dissociated gas increase rapidly at first,and then increase linearly.Both the gas recovery percent and hydrate dissociation percent remain on high levels(>60%).2)the hot water flooding method is suitable for the ClassⅡhydrate reservoir development.Compared with the depressurization method,the hot water flooding method can achieve higher gas recovery percent and hydrate dissociation percent.But the gas-water ratio is higher,indicating a larger amount of water production.

关 键 词：Ⅱ类水合物藏 热水驱替 开采规律 对比 

分 类 号：P74[天文地球—海洋科学] TE37[石油与天然气工程—油气田开发工程]