基于物质平衡原理的页岩气井产能评价方法  

Study on productivity evaluation method of shale gas well based on material balance principle

作　　者：舒志国[1] 刘莉[1] 梁榜 陆亚秋[1] 郑爱维[1] 包汉勇[2] SHU Zhi-guo;LIU Li;LIANG Bang;LU Ya-qiu;ZHENG Ai-wei;BAO Han-yong(Research Institute of Exploration and Development,Jianghan Oilfield Company,Wuhan 430223,China;SINOPEC Jianghan Oilfield Company,Qianjiang 433124,China)

机构地区：[1]中国石化江汉油田分公司勘探开发研究院,湖北武汉430223 [2]中国石化江汉油田分公司,湖北潜江433124

出　　处：《天然气地球科学》2021年第2期262-267,共6页Natural Gas Geoscience

基　　金：国家科技重大专项“涪陵页岩气开发示范工程”(编号:2016ZX05060);中国石化页岩气“十条龙”科技攻关项目“涪陵页岩气田焦石坝区块稳产技术”(编号:P18052)联合资助.

摘　　要：页岩气已成为特低渗透储层中最重要的非常规能源之一,由于其独特的储层性质和多级水力压裂改造的共同作用,形成了复杂的多尺度流动机制。在物质平衡理论的基础上,采用五线性流模型的储层构造简化方式,依据储集容量和渗流特征关系将地层分为基质压力系统和裂缝压力系统,将具有“一井一藏”特征的页岩气井SRV分为基质压力系统和压裂裂缝压力系统,建立了一种基于物质平衡理论的页岩气井产能评价新方法,该方法能准确有效地评价页岩气井产能和地层能量的下降,证明了页岩气井裂缝缝网储集容量是真实存在的、不可忽略的。与RTA软件中的HZ Multifrac模型相比,提出的模型在涪陵页岩气田的典型生产井应用中取得了更准确的评价结果,准确匹配上了不同生产时期的实测井底流压和关井静压,能够为涪陵页岩气井合理配产制度的科学制定提供理论依据。Shale gas has become one of the most important unconventional energy sources in ultra-low permea⁃bility reservoir.Due to its unique reservoir properties and the combined action of multi-stage hydraulic fractur⁃ing,it forms a complex multi-scale flow mechanism.On the basis of flow material balance theory,using the sim⁃plify way of reservoir structural with Five-lines Flow Model,according to the relationship of reservoir capacity and seepage characteristics,the stratum can be divide into matrix pressure system and fracturing fracture pres⁃sure system.This article divided shale gas well SRV into matrix pressure system and fracturing fracture pres⁃sure system,built a new method of shale gas well productivity evaluation which is based on the flow material balance theory.This method can accurately and effectively evaluate the decrease in shale gas production and for⁃mation energy,and proved the fracture net reservoir capacity of the fractures in shale gas well is existed.Com⁃pared with HZ Multifrac model in RTA software,the model in this article has get more accurate evaluation re⁃sult in typical production wells of Fuling shale gas field,exactly matches the measured flowing bottom hole pres⁃sure and shut-in static pressure in different production period,provided a theoretical basis for scientific formula⁃tion of reasonable production allocation system for Fuling shale gas wells.

关 键 词：物质平衡 双压力系统 产能评价 分段压裂水平井 涪陵页岩气田 

分 类 号：TE34[石油与天然气工程—油气田开发工程]