页岩气井EUR评价流程及影响因素  

EUR evaluation workflow and influence factors for shale gas well

作　　者：宋海敬[1] 苏云河[1] 熊小林 刘勇[3] 钟思存 王建君 Song Hai-jing;Su Yun-he;Xiong Xiao-lin;Liu Yong;Zhong Si-cun;Wang Jian-jun(PetroChina Research Institute of Petroleum Exploration and Development,Langfang 065007,China;Sichuan Shale Project Department,CNPC Greatwall Drilling Company,Panjin 124010,China;Shale Exploration and Development Department,PetroChina Southwest Oil and Gas Field Company,Chengdu 610050,China;CCDC Shale Project Department,Chengdu 610050,China;Research Institute of Exploration&Development of Zhejiang Oilfield Company,PetroChina,Hangzhou 310000,China)

机构地区：[1]中国石油勘探开发研究院,河北廊坊065007 [2]中国石油长城钻探工程有限公司四川页岩气项目部,辽宁盘锦124010 [3]中国石油西南油气田公司页岩气勘探开发部,四川成都610050 [4]中国石油川庆钻探公司页岩气项目部,四川成都610050 [5]中国石油浙江油田公司勘探开发研究院,浙江杭州310000

出　　处：《天然气地球科学》2019年第10期1531-1537,共7页Natural Gas Geoscience

基　　金：国家科技重大专项课题“页岩气开发规模预测及开发模式研究”（编号：2016ZX05037-006）资助

摘　　要：EUR是页岩气藏开发的基础,规模效益开发的前提条件。具有纳米尺度的孔隙特征、多重运移机制和“非定压、非定产”的生产模式导致其流动特征复杂和EUR评估存在较大的不确定性。为了降低EUR评价的不确定性,在文献调研的基础上探讨了页岩气井现有七大类EUR计算方法的适用性。结合国内页岩气的开发特征,建立了一套综合考虑数据质量、流态和输入参数等不确定性因素,以生产历史为检验标准的EUR计算方法优选评价流程。最后基于优选的模型,采用蒙特卡洛方法和主成分分析法评价了EUR的主要影响因素,即优质储层的钻遇体积、原始地层压力和改造程度。EUR is the basis of the development for shale gas reservoirs.Complex flow characteristics and variable working schedules lead to a long period of transient flow stage of shale gas wells.EUR evaluation exists big uncertainty.Because of different assumptions,evaluation method of EUR is not fully applicable to the whole life cycle of shale gas well.Firstly,application conditions of multi-methods are discussed.Different methods should be suitable for different flow regimes.Secondly,data quality is the key to the production dynamic analysis,poor data quality results in large uncertainties for EUR evaluation.In order to improve the accuracy,valid data is filtered by the production curve and normalized production/pressure-material balance time.Flow regime is identified by data diagnostic chart of linear flow and modern production decline analysis.Comprehensive consideration of data quality and flow regimes,the EUR evaluation process of shale gas well is put forward.i.e.EUR evaluation method selected is confirmed by history matching and prediction for long time,probability EUR is gained by the distribution of input parameters.Finally,compared to the result of numerical simulation,the method is just right.Reservoir geological sweetness and formation pressure and stimulated reservoir volume are the important influencing factors for shale gas well.

关 键 词：页岩气 EUR 数据诊断 流动阶段 不稳定渗流 边界流 

分 类 号：TE32[石油与天然气工程—油气田开发工程]