摘要
天然气水合物主要分布在极地和深水陆坡区,约95%储存在深水区,目前冻土和海域试采目标区为成岩天然气水合物矿体并多伴有下覆游离气,可采用降压、注热、注剂和CO_2置换等方法进行开发;储存在深水浅层的细粒裂隙型、分散型天然气水合物虽总量大,但因其埋深浅、非成岩、胶结性差,开采方法尚属空白。根据世界其他海域和我国海域天然气水合物取样进展,首次提出了深水浅层天然气水合物固态流化绿色开采技术,即将深水浅层不可控的非成岩天然气水合物藏通过海底采掘、密闭流化、气液固多相举升系统变为可控的天然气水合物资源,从而保证生产安全,减少浅层水合物分解可能带来的环境风险,达到绿色可控开采的目的。文中重点论述了该技术提出的背景、技术原理、数学分析方法及主要技术核心等,以期为深水浅层天然气水合物开采提供借鉴。
Natural gas hydrate is mainly distributed in the polar and slopes of in deepwater,nearly 95 ％ is stored in the deep water.The natural gas hydrate exploration test target zone in permafrost and sea areas is more like ore body and with free gas,which can be developed by depressurization,heat or chemical injection etc.However,most of natural gas hydrates stored in mud-sand layers under the seabed sediments with dispersible hydrate is looser and poor cementation,no method has been found to develop it at present.The authors presented solid fluidization development principle of natural gas hydrate reservoir in shallow layers of deep water for the first time.Combining with the geological situation of marine gas hydrates drilling sampling in our country and abroad,focusing on the core idea of fluidization mining,the technical principle is to change uncontrollable natural gas hydrate in shallow layers of deep water by seabed closed fluidization lifting system into a controllable gas hydrate resources,so as to ensure safe production,achieve the goal of green controllable exploration.This paper mainly discussed the background,technological principle,the method of mathematical analysis and the main core technology to provide reference for development natural gas hydrate stored in shallow layers of deep water.
出处
《中国海上油气》
CAS
CSCD
北大核心
2014年第5期1-7,共7页
China Offshore Oil and Gas
基金
"十二五"国家科技重大专项"深水流动安全及水合物风险控制技术(编号:2011ZX05026-004)"
中国工程院自然科学基金委重大战略课题"深海天然气水合物绿色钻采战略研究"部分研究成果
关键词
深水浅层
天然气水合物
固态流化开采
技术原理
数学分析方法
shallow layer with poor cementation in deep water
natural gas hydrate
solid fluidization mining
technological principle
the method of mathematical analysis
