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

作　　者：胡勇[1,2] 焦春艳 赵益[3] 吴娟 贾松 杨东升[4] 郭长敏[1,2] 陈灿 陈璐瑶[5] HU Yong;JIAO Chunyan;ZHAO Yi;WU Juan;JIA Song;YANG Dongsheng;GUO Changmin;CHEN Can;CHEN Luyao(PetroChina Research Institute of Petroleum Exploration&Development;The Key Laboratory of Gas Reservoir Formation and Development;Research Institute of Exploration and Development,PetroChina Southwest Oil&Gas Field Company;Key Laboratory of Enhanced Oil and Gas Recovery of Ministry of Education,Northeast Petroleum University;University of Chinese Academy of Sciences)

机构地区：[1]中国石油勘探开发研究院,北京市海淀区100083 [2]中国石油天然气集团有限公司天然气成藏与开发重点实验室 [3]西南油气田公司勘探开发研究院 [4]东北石油大学提高油气采收率教育部重点实验室 [5]中国科学院大学

出　　处：《海相油气地质》2025年第2期185-192,共8页Marine Origin Petroleum Geology

基　　金：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。

摘　　要：为了研究井网加密开采对碳酸盐岩气藏提高采收率的作用,以四川盆地磨溪雷一1气藏为研究对象,建立了一套18 m长的大型仿真物理模拟实验方法和装置。在渗透率为0.56×10-3μm2,不同含水饱和度条件下,实验模拟单井开采和井网加密开采两种方式,对于井网加密开采方式,实验进一步对比分析了分批加密、同时加密两种方式在两种不同加密时机(稳产期末和废弃条件)时对气藏采收率效果的影响。实验结果表明:①单井开采时,采收率受含水饱和度影响十分显著,在含水饱和度为20%~50%的条件下,不加密时采收率为14.6%~64.7%;两口井加密后采收率可提高至85.9%~92.7%,效果明显;②加密井提高采收率主要是发挥两方面的作用:一方面是提高未动用区储量动用范围,另一方面是提高已动用区压降效率。气藏储量动用情况与含水饱和度和距离气井远近密切相关,井网加密可以根据储量动用情况进行部署,优选储量未动用区域和已动用(未充分)区域。③部署加密井提高采收率幅度随加密井数增加呈现先增加后降低的趋势,因此,建议老区需要根据气藏剩余储量特征合理优化加密井数,不宜过度加密。从提高采收率幅度和开采效率两个角度分析,在稳产期末采用集中部署加密井同时加密方式,对延长稳产期、提高采收率和缩短生产周期更为有利。研究成果对于气藏井网加密部署提高采收率具有指导意义。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 0.56×10-3μm2 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 nu

关 键 词：天然气藏 碳酸盐岩 井网加密 提高采收率 物理模拟 

分 类 号：TE327[石油与天然气工程—油气田开发工程]