基于多周期注采的气藏型地下储气库储层渗流规律  

Seepage law of gas-reservoir UGSs during multi-cycle injection and production

作　　者：范宇 高新平 宁飞 彭钧亮 李力民 彭欢 陈明君[4] FAN Yu;GAO Xinping;NING Fei;PENG Junliang;LI Limin;PENG Huan;CHEN Mingjun(Engineering Technology Research Institute,PetroChina Southwest Oil&Gasfield Company,Chengdu,Sichuan 610017,China;Technical Consulting Center,PetroChina Southwest Oil&Gasfield Company,Chengdu,Sichuan 610017,China;Chongqing Xiangguosi Underground Gas Storage Co.,Ltd.,Chongqing 400120,China;State Key Laboratory of Oil&Gas Reservoir Geology and Exploitation//Southwest Petroleum University,Chengdu,Sichuan 610500,China)

机构地区：[1]中国石油西南油气田公司工程技术研究院 [2]中国石油西南油气田公司技术咨询中心 [3]重庆相国寺储气库有限公司 [4]油气藏地质及开发工程全国重点实验室·西南石油大学

出　　处：《天然气工业》2023年第10期103-111,共9页Natural Gas Industry

基　　金：中国石油油气和新能源公司2022年科技课题“碳酸盐岩气藏高效建库关键技术研究及现场试验”(编号:2022KT2303);中国石油西南油气田公司2018年科研项目“相国寺储气库注采井储层伤害评价研究”(编号:20180303-12)。

摘　　要：气藏型地下储气库(以下简称储气库)会面临多周期、大流量地强注强采,其生产特征会使储层物性发生改变,进而影响注采井产能及储气库整体运行效果。为此,以碳酸盐岩气藏型储气库储层为研究对象,建立了模拟储气库实际注采生产特征的实验方法,并开展了储层岩石强度、有效应力、注采压差和温度对注采能力影响的实验,最后形成基于储层保护的储气库高效注采技术方案。研究结果表明:①注采过程岩石抗压强度的变化对储气库运行无影响,注采生产对初始物性越好的储层渗流能力伤害越小,且伤害随注采周期的增加趋于平稳;②控制一定的生产压差,可避免微粒运移对储层的伤害并有利于排出储层中的微粒;③储层渗流能力随温度升高而降低,温度变化对储层渗流能力伤害主要发生在前3个注采周期。结论认为,储气库在投运前进行储层改造、从第4注采周期开始进行储气库扩容和控制生产压差注采,能显著提高注采效率并起到储层保护的作用,该认识对优化储气库注采制度提供技术支撑,对其他储气库制定高效注采方案具有重要借鉴意义。An underground gas storage(hereinafter referred to as UGS)rebuilt from a gas reservoir has the operation characteristics of multi-cycle and high-rate injection and production,which lead to the changes in reservoir physical properties,and further affecting the productivity of injection and production wells and the overall operational efficiency of the UGS.To address this problem,this paper establishes an experimental method of simulating UGS's actual injection and production characteristics by taking the storage strata of a carbonate gas-reservoir UGS as an example.Based on this,the effects of reservoir rock strength,effective stress,injection–production pressure difference and temperature on injection and production capacities are experimentally investigated.Finally,a UGS efficient injection and production technology scheme based on reservoir protection is prepared.And the following research results are obtained.First,the change in rock compressive strength in the process of injection and production has no influence on UGS operation.The seepage capacity of reservoirs with better initial physical properties is less susceptible to the damage from injection and production,and the damage tends to stabilize with the increase of injection–production cycles.Second,keeping the production pressure difference at a certain level can avoid reservoir damage from particle migration and facilitate the discharge of particles out of the reservoir.Third,reservoir seepage capacity decreases with increasing temperature,and the damage of temperature change to reservoir seepage capacity occurs mainly in the first three injection–production cycles.In conclusion,carrying out reservoir transformation before the UGS is put into operation,starting storage capacity expansion in the fourth injection–production cycle and controlling the production pressure difference can significantly improve the injection–production efficiency and protect the reservoir.These research results provide a technical support for optimizing UGS injection

关 键 词：气藏型储气库 岩石抗压强度 储层渗流能力 微粒运移 注采压差 高效注采技术 

分 类 号：TE972.2[石油与天然气工程—石油机械设备]