海域非成岩天然气水合物储层改造方法分析

Analysis of the stimulation methods for marine non-diagenetic natural gas hydrate reservoirs

摘要:

天然气水合物是未来重要的战略开采资源，受到了世界各国的广泛关注，因此对海底天然气水合物进行大规模开采成为必然。目前，海底天然气水合物开采还处于试采阶段，到目前为止还未形成成熟的开采方式。本文从人们所担心的海域天然气水合物开采过程中因储层非成岩可能出现的海底水合物大规模气化、破坏海洋生态环境、产生海底地质灾害等问题出发，对海域天然气水合物开采的安全性进行了分析。同时调研了当前世界各国海域天然气水合物试采现状，指出了进行储层改造是海域天然气水合物未来进行大规模开采的必由之路。探讨分析了采用水力喷射微小井眼技术边钻进水平井边喷射改进发泡水泥浆以进行储层改造的可行性，可为我国水合物商业化开采提供借鉴。

Abstract:

Natural gas hydrate is an important strategic exploitation resource in the future， which has been widely concerned by all countries in the world. Therefore， large-scale exploitation of subsea natural gas hydrate is inevitable. At present， the exploitation of subsea natural gas hydrate is still in the trial production stage， and so far no mature mining method has been formed. Starting from the problems caused by non-diagenetic that people are worried about during the exploitation of marine natural gas hydrate， such as large-scale gasification of subsea hydrate， destruction of marine ecological environment and submarine geological disasters， this paper analyzes the safety of the exploitation of marine natural gas hydrate， investigates the present situation of the exploitation of marine natural gas hydrate in the world， points out that reservoir stimulation is the only way for large-scale exploitation of marine natural gas hydrate in the future， and explores the feasibility of reservoir stimulation with modifying foamed cement slurry by hydraulic jet while drilling horizontal wells with hydraulic jet micro hole technology， which lays a foundation for the commercial exploitation of gas hydrate in China.