Change of phase state during multi-cycle injection and production process of condensate gas reservoir based underground gas storage  

作　　者：TANG Yong LONG Keji WANG Jieming XU Hongcheng WANG Yong HE Youwei SHI Lei ZHU Huayin 

机构地区：[1]State Key Laboratory of Oil&Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu 610500,China [2]PetroChina Research Institute of Petroleum Exploration&Development,Beijing 100083,China [3]Key Lab of Oil and Gas Underground Gas Storage Engineer of China National Petroleum Corporation,Langfang 065007,China

出　　处：《Petroleum Exploration and Development》2021年第2期395-406,共12页石油勘探与开发（英文版）

基　　金：Supported by the National Natural Science Foundation of China(51974268);the PetroChina Science and Technology Major Project(2015E-4002);China Postdoctoral Science Foundation(2019M663563)。

摘　　要：Based on the differences in production mode and operation process between gas storage and gas reservoir,we established a phase balance test procedure and a theoretical simulation model of phase balance during multi-cycles of injection and production of underground gas storage(UGS)rebuilt from condensate gas reservoir to study the phase characteristics of produced and remaining fluids during multi-cycles of injection and production.Take condensate reservoir gas storage as example,the composition of produced fluid and remaining fluid,phase state of remaining fluid,retrograde condensate saturation and condensate recovery degree in the process of multi-cycles of injection-production were studied through multi-cycle injection-production experiment and phase equilibrium theory simulation.The injected gas could greatly improve the recovery of condensate oil in the gas reservoir,and the condensate oil recovery increased by 42% after 5 cycles of injection and production;the injected gas had significant evaporative and extraction effects on the condensate,especially during the first two cycles;the condensate oil saturation of the formation decreased with the increase of injection-production cycles,and the condensate oil saturation after multi-cycles of injection-production was almost 0;the storage capacity increased by about 7.5% after multi-cycles of injection and production,and the cumulative gas injection volume in the 5 th cycle increased by about 25%compared with that in the 1 st cycle.

关 键 词：condensate gas reservoir gas storage phase characteristics multi-cycles of injection-production EOR 

分 类 号：TE372[石油与天然气工程—油气田开发工程]