摘要
致密砂岩气藏具有低孔、低渗、孔隙结构复杂、孔隙连通性差等特点,易受到水锁效应严重损害。为此,根据致密砂岩气藏的水锁机理以及储层条件,选择对应储层的长岩心,开展了不同储层条件、不同水锁程度下的压力损失评价和渗透率损害评价实验,并提出了压力损失和渗透率损害率2个概念,表征水锁效应对压力传播过程和储层渗透率的损害程度。结果表明:在气田开发过程中,水锁效应对物性较差、气测渗透率较低的储层损害最大,应提前实施预防措施;物性较好、气测渗透率较高的储层可根据其压力损失和渗透率损害率决定是否需要采取优化措施。针对不同储层,合理地实施解除水锁工艺对于气井的生产以及经济效益具有重要意义。
Tight sandstone gas reservoirs are characterized by low porosity,low permeability,complex pore structure,and poor pore connectivity,and are susceptible to severe damage by the water blocking effect.For this reason,according to the water blocking mechanism and reservoir conditions of tight sandstone gas reservoirs,long cores corresponding to the formation were selected.Pressure loss evaluation and permeability damage evaluation experiments under different reservoir conditions and different water blocking degrees were carried out.Two concepts were proposed,namely pressure loss rate and permeability damage rate,to characterize the damage degree of water blocking effect to the pressure propagation process and reservoir permeability.The results show that:in the process of gas field development,the water blocking effect badly damages the reservoirs with poor physical properties and low gas permeability,and preventive measures should be implemented in advance;reservoirs with better physical properties and higher gas permeability can be determined whether optimization measures are needed based on the value of its pressure loss rate and permeability damage rate.For different reservoirs,the reasonable implementation of the water unblocking process is of great significance to the production and economic benefits of gas wells.
作者
苏玉亮
庄新宇
李蕾
李新雨
李东升
郑建阳
Su Yuliang;Zhuang Xinyu;Li Lei;Li Xinyu;Li Dongsheng;Zheng Jianyang(China University of Petroleum(East China),Qingdao,Shandong 266580,China)
出处
《特种油气藏》
CAS
CSCD
北大核心
2021年第1期98-102,共5页
Special Oil & Gas Reservoirs
基金
山东省重点研发项目“页岩储层多尺度耦合渗透率表征及应用”(2018GF116004)。
关键词
致密砂岩气藏
水锁效应
长岩心
压力损失
渗透率损害率
气井产能
tight sandstone gas reservoir
water blocking effect
long core
pressure loss
permeability damage rate
gas well productivity
