川西裂缝-孔隙型致密砂岩边底水气藏水侵识别方法  

Water invasion identification method of fracture-pore tight sandstone edge-bottom water gas reservoir in western Sichuan Basin

作　　者：郎丽媛 刘露[1] 毕有益[1] 邓美洲[1] LANG Liyuan;LIU Lu;BI Youyi;DENG Meizhou(Exploration and Development Research Institute,Southwest Oil and Gas Field Company,SINOPEC,Chengdu 610000,China)

机构地区：[1]中国石化西南油气分公司勘探开发研究院,四川成都610000

出　　处：《断块油气田》2025年第2期322-330,共9页Fault-Block Oil & Gas Field

基　　金：中石化科技项目“川西须二难动用储量效益开发关键技术”02课题“川西须二气藏高效开采技术”(P24004)。

摘　　要：新场-合兴场须二段气藏为裂缝-孔隙型致密砂岩边底水气藏,气井发生水侵会严重影响气井产能、降低可采储量。为解决早期水侵识别难题,文中基于地下水的赋存状态、产水特征、产出水化学性质以及动态特征参数,建立水侵识别标准,并通过水驱特征曲线和诺瓦克相图叠合图,可简单、快速、准确地判别气井是否水侵,结合地质、地球物理及气藏工程一体化分析,确定水侵来源,评价水体能量,提出了针对性的防水治水措施。研究结果表明:该气藏气井产出水分为凝析水、毛细水、层内(间)水、边底水4类,其中边底水水侵对气井生产影响最严重;水侵模式主要有底水纵窜型和边底水横侵纵窜型。底水纵窜型气井水侵速度快,产量年递减率达80%以上,可采储量降幅50%以上,一般3~5 a即水淹关井;而边底水横侵纵窜型水侵速度相对较慢,产量年递减率达40%以上,可采储量降幅30%以上。针对底水纵窜型的气井,可采取封堵主产水层,切断水体来源的堵水治水措施;针对边底水横侵纵窜型的气井,建议采用合理配产及低排高采的防水措施。The Xinchang-Hexingchang Xu 2 Member gas reservoir is a fracture-pore tight sandstone edge-bottom water gas reservoir.Water invasion will seriously affect the productivity of gas wells and reduce the recoverable reserves.To solve the problem of early-stage water invasion identification,based on the occurrence state of groundwater,water production characteristics,chemical properties of produced water and dynamic characteristics parameters,criteria for water invasion identification are established.Through water drive characteristics curves and Novak superposition diagram,whether the gas well is water-invaded can be easily,quickly and accurately identified.Meanwhile,combined with the integrated analysis of geology,geophysics and gas reservoir engineering,the source of water invasion is determined,the water body energy is evaluated and targeted water proof and water control measures are proposed.The research results show that the produced water of gas wells of the gas reservoir can be divided into the following four types:condensate water,capillary water,intra(inter)layer water and edge-bottom water,and the edge-bottom water invasion has the most serious effect on the production of gas wells.The water invasion modes mainly include bottom water longitudinal channeling and edge-bottom water lateral invasion longitudinal channeling.The water invasion rate of bottom water longitudinal channeling gas wells is fast,the annual production decline rate is more than 80%,the recoverable reserves decrease by more than 50%,and the wells are generally water-invaded and shut down in 3-5 years.The water invasion rate of edge-bottom water lateral invasion longitudinal channeling is relatively slow,the annual production decline rate is more than 40%,and the recoverable reserves decrease by more than 30%.For gas wells with bottom water longitudinal channeling,water plugging and water control measures can be taken to block the main water producing layer and cut off the water source.For gas wells with edge-bottom water lateral invasion l

关 键 词：裂缝-孔隙型致密砂岩气藏 水驱特征曲线 诺瓦克相图叠合图 水侵模式 防水治水 

分 类 号：TE34[石油与天然气工程—油气田开发工程]