摘要
为研究海相砂岩气藏气水两相驱替微观渗流特征,以番禺气田储层为例,开展气水相渗及微观可视化实验,模拟气藏成藏及开发过程中不同类型储层的气水渗流及分布规律。结果表明:研究区目的层位储层渗流能力较好,Ⅰ类储层的共渗区明显大于Ⅱ、Ⅲ类储层。微观可视化实验表明气驱水过程气体优先进入大孔径、孔隙中央,且气驱前缘发生跳跃式的转换;而在水驱气过程中,水优先进入小孔径,在毛管力的作用下产生强烈的指进现象,而当流速增大到一定值时,孔径尺寸不再影响水的前进方向,水能够同时进入各个大小的孔径中,使得水驱前缘均匀推进,且随着驱替速度的适当增加,水驱气末期残余气饱和度越低气体采出程度越高;残余气主要有绕流和卡段两种,各自具有不同的形成机理。研究成果可为海相砂岩水驱气藏高效开发及调整挖潜提供依据。
In order to study the micro seepage characteristics of gas water two-phase displacement in marine sandstone gas reservoirs,taking the Panyu gasfield reservoir as an example,gas water phase permeability testing and micro visualization experiments were carried out to model the gas water seepage and distribution patterns of different types of reservoirs during gas reservoir formation and development.The results indicate that the permeability of the target reservoir in the study area is good,and the copermeability zone of classⅠreservoir is significantly greater than that of classⅡandⅢreservoirs.Microscopic visualization experiments show that during the gas drive water process,gas preferentially enters the large pore size and the center of the pore,and the leading edge of the gas drive undergoes a jumping transition.In the process of water drive gas,water preferentially enters the small pore size,causing a strong fingering phenomenon under the action of capillary force.When the flow rate increases to a certain value,the pore size no longer affects the direction of water movement.Water can simultaneously enter various pore sizes,making the front edge of water drive uniformly advance.With an appropriate increase in displacement speed,the lower the residual gas saturation at the end of water drive gas,the higher the degree of gas recovery.There are mainly two types of residual gas,bypass flow and block flow,each with different formation mechanisms.The research results can provide a basis for the efficient development and adjustment of marine sandstone water drive gas reservoirs to tap their potential.
作者
白美丽
秦峰
洪舒娜
杨鹏
陈斯宇
BAI Meili;QIN Feng;HONG Shuna;YANG Peng;CHEN Siyu(CNOOC(China)Co.,Ltd.,Shenzhen Branch,Shenzhen Guangdong 518064,China)
出处
《石油化工应用》
CAS
2023年第9期71-75,共5页
Petrochemical Industry Application
关键词
海相砂岩
气水两相渗流
驱替实验
微观可视化
marine sandstone
gas-water two-phase flow
displacement experiment
microscopic visualization
