考虑段间SRV非均质性的海陆过渡相页岩气压裂水平井产出剖面预测模型  

Production profile prediction model of fractured marine-terrestrial transitional facies shale gas horizontal wells considering SRV heterogeneity between different sections

作　　者：魏明强 王浩 段永刚 陈虎 李星涛 杨海星 孙玉平[4] 段希宇 WEI Mingqiang;WANG Hao;DUAN Yonggang;CHEN Hu;LI Xingtao;YANG Haixing;SUN Yuping;DUAN Xiyu(Petroleum Engineering School,Southwest Petroleum University,Chengdu,Sichuan 610500,China;Sichuan Shale Gas Industry Development Research Institute,Chengdu,Sichuan 610500,China;PetroChina Coalbed Methane Co.,Ltd.,Beijing 100028,China;PetroChina Research Institute of Petroleum Exploration&Development,Beijing 100083,China;Shale Gas Research Institute,PetroChina Southwest Oil&Gasfield Company,Chengdu,Sichuan 610051,China)

机构地区：[1]西南石油大学石油与天然气工程学院 [2]四川省页岩气产业发展研究院 [3]中国石油煤层气有限责任公司 [4]中国石油勘探开发研究院 [5]中国石油西南油气田公司页岩气研究院

出　　处：《天然气工业》2023年第8期80-89,共10页Natural Gas Industry

基　　金：中国石油—西南石油大学创新联合体科技合作项目“海陆过渡相多层叠置页岩气压裂及开发优化技术研究”(编号:2020CX030200);中国石油基础性前瞻性科技专项“页岩油气开发机理与体积开发技术研究(编号:2023ZZ08)”。

摘　　要：准确认识水平井压裂后各段产出贡献、返排规律及井底生产动态是判断压裂改造有效性和提升设计针对性的依据,对提高气井产能和降本增效具有重要意义。为此,针对海陆过渡相页岩气长水平井非均质性和差异化增产改造引起的各段改造程度差异性问题,建立了考虑页岩储层非均质性和各段改造体积与改造程度差异的5区不稳定线性流压裂水平井产出剖面预测模型,运用现代数学物理方法和Stehfest数值反演方法获得了气井产量及各压裂段流量产出贡献曲线,并分析了各段的天然气产出规律及其影响因素。研究结果表明:(1)压降双对数、产能递减和各段产出贡献曲线可划分为裂缝线性流、裂缝改造区流、改造区外流、系统拟径向流及边界控制流5个流动阶段;(2)改造区渗透率和面积对裂缝线性流动阶段、裂缝改造区流动阶段的产出贡献率影响为正相关关系;(3)改造区外渗透率增加,系统拟径向流阶段产出贡献率增长且持续时间增加;(4)实际页岩气井产出剖面预测与示踪剂监测结果吻合较好,验证了模型的实用性和可靠性。结论认为,考虑段间SRV非均质性的页岩气压裂水平井产出剖面预测模型,可以有效解决页岩气藏工程中产出剖面预测难的问题,对页岩气压裂工艺优化及效益开发具有重要的指导作用。After a horizontal well is fractured,it is necessary to accurately understand its sectional production contribution,flowback laws and bottom hole production performance,which is the basis for judging fraturing effetiveness and improving design pertinence,and it of important significance to gas well productivity increase and the realization of cost reduction and efficiency improvement.In view of the heterogeneity of long horizontal wells in marine-continental transitional shale gas and the stimulation degree difference between different sections caused by differential simulation,this paper establishes a production profile prediction model of fractured horizontal well with five-zone transient linear flow considering shale reservoir heterogeneity and SRV and stimulation degree differences between different sections.The production rate of the In view of the heterogeneity of long horizontal wells in marine-continental transitional shale gas and the stimulation degree difference between different sections caused by differential simulation,this paper establishes a production profile prediction model of fractured horizontal well with five-zone transient linear flow based on shale reservoir heterogeneity and SRV and stimulation degree differences between different sections.The production rate of the gas well and the production contribution curve of each fracturing section are obtained by using the modern mathematical physics method and the Stehfest numerical inversion method.In addition,the gas production laws of each section and their influential factors are analyzed.The following research results are obtained.First,the double logarithmic pressure drop,productivity decline and production contribution curve of each section can be divided into five flow stages:fracture linear flow,fracture transformation zone flow,transformation zone outer flow,quasi radial flow and boundary control flow.Second,the permeability and area of the transformation zone have a positive correlation with the production contribution rate of the frac

关 键 词：海陆过度相 页岩气 压裂水平井 非均质 产能 产气剖面 预测模型 

分 类 号：TE377[石油与天然气工程—油气田开发工程]