海相油气地质2025，Vol.30Issue(2)：185-192,8.DOI:10.3969/j.issn.1672-9854.2025.02.009
碳酸盐岩气藏井网加密开采提高采收率大型仿真物理模拟实验
Large-scale physical simulation experiment on enhanced gas recovery by well pattern infilling in carbonate gas reservoirs
摘要
Abstract
In order to study the effect of well pattern infilling on enhancing gas recovery of carbonate gas reservoirs,taking the T2l11 gas reservoir of Moxi gas field in Sichuan Basin as an example,a set of large-scale 18-meter physical simulation experimental device and method are established.The experimental model have a permeability of 0.56×10-3 μm2 and single well exploitation and well infilling(Well 1 and Well 2 are deployed at 14.1 m(78.3%)and 4.6 m(25.6%)from the initial well,respectively)exploitation have been simulated based on the model.The experiment measure gas production and pressure throughout the entire life cycle,revealing the reserve utilization laws under different water saturation conditions of the gas reservoir.The study compares and analyzes the effects of batch and simultaneous infilling methods,as well as the timing of two infilling methods at the end of stable production and under abandoned conditions,on improving the recovery efficiency of the gas reservoir.The experimental results show that:(1)For single well exploitation,gas recovery is significantly affected by water saturation,showing a significantly decrease with increasing water saturation.The recovery is 14.6%to 64.7%under the condition of water saturation of 20%-50%;compared with single well deployment,the rate of recovery can increase to 85.9%-92.7%after two wells are infilled,and the effect of infilling is significant.(2)Infilling wells enhancing gas recovery have two functions:one is to improve the production range of reserves in the undeveloped area,and the other is to improve the pressure drop efficiency in the developed area.The production of gas reservoir reserves is closely related to the water saturation and the distance from the gas well.The well pattern infilling can be deployed according to the production of reserves,and the undeveloped area and the developed(insufficient)area of reserves are preferred.(3)The enhancement of recovery rate through the deployment of infilling wells initially increases and then decreases as the number of well increases.Therefore,it is recommended to optimize the number of infilling wells in developed areas based on the characteristics of the remaining reserves in the gas reservoir,avoiding excessive infilling.Further analysis from the perspectives of enhanced gas recovery range and exploitation efficiency shows that adopting a centralized deployment of infilling wells and simultaneous infilling at the end of stable production period is more beneficial for extending stable production period,improving recovery,and shortening production cycle.The research results can guide the deployment of well pattern infilling in gas reservoir to enhance gas recovery.关键词
天然气藏/碳酸盐岩/井网加密/提高采收率/物理模拟Key words
natural gas reservoir/carbonate rock/well pattern infilling/enhanced gas recovery/physical simulation ex-periment分类
石油、天然气工程引用本文复制引用
胡勇,焦春艳,赵益,吴娟,贾松,杨东升,郭长敏,陈灿,陈璐瑶..碳酸盐岩气藏井网加密开采提高采收率大型仿真物理模拟实验[J].海相油气地质,2025,30(2):185-192,8.基金项目
本文受中国石油天然气股份有限公司前瞻性基础性科技课题"国内已开发气田储采平衡分析与SEC增储技术研究"(编号:2022DJ7902)资助 （编号:2022DJ7902）
