摘要
有水气藏的水侵造成大量气体封存在储层中,其采收率仅为30～50%。本文从微观实验角度出发,探索注N2提高有水气藏采收率方法。在均质孔隙模型中进行N2驱天然气和水实验,气驱前沿主要表现形式为跳跃式的运移和粘性指进。实验中,平均气驱效率为68.62%。在裂缝～孔隙模型中进行N2驱天然气和水实验,N2优先选择较好的渗流通道流动,可以有效补充模型中天然气的能量,形成气体活塞,驱动裂缝中的水流动。实验中,平均气驱效率为64.63%。认为注N2开采能有效提高有水气藏的开采效果。
A large number of gas was trapped by water invasion in gas reservoir with water,resulting in 30-50% gas recovery.Based on the microscopic experiments,injecting N2 development to improve oil recovery was researched.N2 flooding gas(natural gas and water) in homogeneous pore model,skipped flowing and viscous fingering were observered in the front of gas and water.The mean displacement efficiency was 68.62%.In the fracture-pore ??model,N2 preferred a better flow channel flow,promoting the natural gas energy,forming bigger gas piston,driving water flow.The mean displacement efficiency was 64.63%.The results showed the injecting N2 development is a new efficient and reasonable method to develop of the gas reservoir with water.
出处
《内蒙古石油化工》
CAS
2012年第3期1-3,共3页
Inner Mongolia Petrochemical Industry
基金
教育部博士点基金(20105121110006)资助
关键词
注N2开发
有水气藏
微观模型
Injecting N2 development
Gas reservoir with water
Microscopic model.
