摘要
针对目前天然气水合物降压开采效率较低、产能不足等问题,文中提出了基于水平井射孔和回撤抽提的天然气水合物降压抽采工艺。利用有限元分析软件,建立了天然气水合物降压抽采三维模型,分析抽采过程中储层压力分布和流场变化规律,对日产气量进行估算,并与南海神狐工程试采数据、中海油天然气水合物商业开采标准测算的日产气量进行对比。研究结果表明:采用水平井射孔可显著扩大降压范围、增加产气速率,同时连续的水平井回撤抽提工艺利用了储层降压产气最高效时段,从而在空间和时间上提高了天然气水合物的抽采效率,估算的日产气量远远高于南海神狐工程试采的最高日产气量。该研究确保了天然气水合物商业化开采具有良好的经济性,为后续的开采工艺研究提供了借鉴。
To solve the problems of low production efficiency and insufficient yield of natural gas from hydrate reservoir,this paper proposes a gas hydrate depressurization process based on horizontal well perforation arrangement and recursive extraction process.A three-dimensional model of the depressurization and extraction of the Shenhu reservoir in the South China Sea under this method was established by using finite element analysis software.The pressure distribution and the time-varying law of the reservoir during the mining process were analyzed,and the daily gas production was estimated.Finally,the estimated daily gas production was compared with the testing data from Shenhu engineering and the existing commercial standards for natural gas hydrate production calculated by CNOOC.The results show that the use of horizontal well perforation can significantly expand the pressure reduction range and increase the gas production rate.At the same time,the continuous horizontal well retracement extraction process utilizes the most efficient period of reservoir pressure reduction and gas production,thereby improving the efficiency of natural gas hydrate extraction.The daily gas production is far better than the highest single-day gas production efficiency of the trial production,ensuring that the commercial exploitation of natural gas hydrate has good economics,and laying the foundation for subsequent research on mining technology.
作者
宋震
青显林
张运祥
宋军
SONG Zhen;QING Xianlin;ZHANG Yunxiang;SONG Jun(School of Mechanical and Electrical Engineering,Southwest Petroleum University,Chengdu 610500,China)
出处
《断块油气田》
CAS
CSCD
北大核心
2020年第6期719-724,共6页
Fault-Block Oil & Gas Field
关键词
天然气水合物
水平井射孔
抽提
有限元分析
经济性
南海
gas hydrate
horizontal well perforation
recursive extraction
finite element analysis
economics
South China Sea
作者简介
第一作者:宋震,男,1981年生,副研究员,博士,主要从事智能与高效开采技术方面的研究。E-mail:zhen.song@rwth-aachen.de;通讯作者:青显林,男,1995年生,在读硕士研究生,主要从事天然气水合物降压开采方面的研究。E-mail:qxl_0104@163.com。
