摘要
随着对页岩气藏地质认识的深化,页岩气藏立体开发调整已是提高页岩气储量动用率和采收率的一种常用方式。受井距小、天然裂缝发育、老井动用不均等影响,页岩气立体开发井之间的压裂干扰不可避免且干扰类型多样,老井表现出的动态特征差异明显,故以生产响应为基础的缝网沟通诊断必不可少。文中以南川工区页岩气藏为研究对象,采用水力压裂模拟、气藏工程动态分析等手段,开展了页岩气井缝网沟通诊断方法研究。结果表明:1)按照裂缝导流能力,立体开发井缝网沟通机理可表现为天然裂缝与压裂缝所组成缝网的4种沟通形式。2)响应于不同的缝网沟通形式,在立体开发井压裂施工期间,老井关井套压呈现平稳上涨、上涨波动、轻微波动回落、剧烈波动等4种波动类型,套压涨幅主控因素为天然裂缝发育程度、井间采出程度及新井强改造规模等。3)结合老井复产后生产指标、递减规律、试井曲线等的变化特征,建立了南川工区页岩气立体开发井压裂干扰缝网沟通预测表。在矿场实践中,可以根据预测表中的某几个特征,预测井间生产干扰或缝网沟通情况,为精细化数值模拟和立体开发井分段压裂优化提供科学指导。
With the deepening of geological understanding of shale gas reservoir,three-dimensional development adjustment has become a common way to improve the utilization rate and recovery rate of shale gas reserves.Influenced by small well spacing,the development of natural fractures and the unequal utilization of old wells,fracturing interferences between three-dimensional shale gas development wells are inevitable and diverse,and the dynamic characteristics displayed by old wells are obviously different.Therefore,the diagnosis of fracture network communication based on production response is necessary.This paper takes the shale gas reservoir in Nanchuan work area as the research object,and uses hydraulic fracturing simulation and dynamic analysis of gas reservoir engineering to study the diagnostic method for fracture network communication in shale gas wells.The results show that:(1)According to the fracture conductivity,the fracture network communication mechanism of three-dimensional development wells can be represented by four communication forms of fracture network composed of natural fractures and fracturing fractures.(2)Responsing to different forms of fracture network communication,during the fracturing construction of three-dimensional development wells,the shut-in casing pressure of old wells presents four fluctuation forms,namely steady rise,rising fluctuation,slight fluctuation fall and violent fluctuation.The main controlling factors for casing pressure increase rate are the development degree of natural fractures,the inter-well recovery degree and the scale of new well strength transformation.(3)Combined with the change characteristics of production indexes after reproduction of old wells,decline rules and well testing curves etc.,a prediction table of fracturing interference fracture network communication of three-dimensional development wells in Nan-chuan work area is established.In field practice,the inter-well production interference or the fracture network communication can be predicted according to s
作者
刘欣
任建华
王伟
LIU Xin;REN Jianhua;WANG Wei(Chongqing Shale Gas Co.,Ltd.,East China Oil&Gas company,SINOPEC,Chongqing 408400,China;Research Institute of Exploration&Production,East China Oil&Gas company,SINOPEC,Nanjing 210000,China)
出处
《断块油气田》
CAS
CSCD
北大核心
2024年第2期225-231,共7页
Fault-Block Oil & Gas Field
基金
中国石化“十条龙”重大科技攻关项目“南川复杂构造带页岩气勘探开发关键技术研究”(P19017-3)
中国石化科技项目“常压页岩气效益开发技术政策优化研究”(P21087-4)。
关键词
页岩气井
立体开发
缝网沟通
动态响应
压裂干扰
数值模拟
shale gas well
three-dimensional development
fracture network communication
dynamic response
fracturing inter-ference
numerical simulation
