缝洞型油藏试井模型及其在顺北油田的应用  

Application of well testing model in fractured-vuggy reservoir in Shunbei Oilfield

作　　者：杜娟[1] DU Juan(Sinopec Research Institute of Petroleum Engineering,Beijing 100101,China)

机构地区：[1]中国石化石油工程技术研究院,北京100101

出　　处：《大庆石油地质与开发》2023年第2期77-85,共9页Petroleum Geology & Oilfield Development in Daqing

基　　金：国家科技重大专项子课题“海相碳酸盐岩超深油气井关键工程技术”(2017ZX05005);中国石化科技攻关重大项目“特深层完井测试与储层改造技术”(P21081);中国石化科技攻关项目“顺北地区测试关键技术研究”(P19004)。

摘　　要：塔里木盆地顺北油田为缝洞型油藏,裂缝、大尺度溶洞并存,流动机理复杂,常规试井模型无法进行解释。在分析地层渗流、溶洞流体波动、井筒管流耦合的流体流动特征基础上,建立了钻遇溶洞、未钻遇溶洞2种缝洞型油藏试井模型。研究结果表明:缝洞型油井的井底压力响应曲线上可识别出井储、过渡、溶洞1、地层裂缝、溶洞2等流动阶段,而顺北地区油井多洞参与流动的特征较多,主要表现为有明显双洞特征和无明显双洞特征2种曲线类型;通过模型参数反演能够得到溶洞体积、溶洞距离、缝洞体积等参数。对顺北油田1口油井进行分析表明,新模型与实测曲线拟合精度高,拟合率达85%以上,计算的地层参数能够满足工程精度,且符合油藏地质特征。研究成果可用于缝洞型油藏试井资料解释。Shunbei Oilfield in Tarim Basin is fractured-vuggy reservoir with fractures and large-scale vugs coexisting and complex flow mechanism, and cannot be explained by conventional well testing models. Based on analysis of fluid flow characteristics coupled with formation flow, vug fluid fluctuation and wellbore tubular flow, 2 well testing models for drilled and undrilled fractured-vuggy reservoirs are established. The study shows that the flow stages of wellbore storage,transition, vug 1, formation fracture and vug 2 are identified on bottom hole pressure response curve of fractured-vuggy type producers. There are several characteristics of multiple vugs involved in the flow of producers in Shunbei area, mainly appear as 2 types of curves with obvious double vug characteristics and without obvious double vug characteristics. Vug volume,Vug distance and Fracture cavity volume parameters can be obtained by inversion of model parameters. Analysis of a well in Shunbei Oilfield shows that the new model has high matching accuracy with measured curve with matching rate more than 85%. Calculated formation parameters meet the engineering accuracy and are consistent with the reservoir geological characteristics, The research achievement can be applied in well testing data interpretation for fractured-vuggy reservoirs.

关 键 词：缝洞型油藏 裂缝 溶洞 试井模型 试井解释 顺北油田 

分 类 号：TE353[石油与天然气工程—油气田开发工程]