基于停泵压降数据的致密油储层改造效果评价方法  

Methods for evaluating stimulation effect in tight oil reservoirs based on pump-shutoff pressure decline data

作　　者：段永伟 王翠翠[2] 于雪盟 刘洪霞 陈凯 朱旭 DUAN Yongwei;WANG Cuicui;YU Xuemeng;LIU Hongxia;CHEN Kai;ZHU Xu(College of Petroleum Engineering,Northeast Petroleum University,Daqing,Heilongjiang 163318,China;Oil and Gas Technology Research Institute,Jilin Oilfield Company,Songyuan,Jilin 138000,China)

机构地区：[1]东北石油大学石油工程学院,黑龙江大庆163318 [2]中国石油吉林油田公司油气工艺研究院,吉林松原138000

出　　处：《油气井测试》2024年第5期60-66,共7页Well Testing

基　　金：中国石油天然气股份有限公司重大科技专项“吉林水平井体积改造技术提升攻关与现场试验”(2022ZS0604)。

摘　　要：吉林油田致密油储层压后效果差异大,无法快速有效、低成本评价人工裂缝参数,解决压裂效果认识不清的问题。利用G函数以及不稳定试井压降分析的基本理论,拓展其应用范围,提出基于主压停泵压降数据的压后效果定性定量评价方法,以致密油储层H197-48井其中两段为例,根据压降数据的G函数曲线形态判断裂缝复杂程度,利用主压停泵压降曲线定量解释技术对储层及裂缝关键参数进行分析。结果表明:第十一段和第十六段形成的裂缝均是复杂裂缝,两段裂缝条数均为4条,裂缝半长分别为134 m、186 m,第十六段储层改造效果优于第十一段,裂缝形态、裂缝条数、裂缝半长等结果与高频压力监测分析结果相符,验证了评价方法的准确性。该压后效果评价方法,所需资料易获得,分析过程简便,成本低,解释结果可靠,可指导下步压裂方案优化。In the Jilin oilfield,the stimulation effect in tight oil reservoir varies significantly,making it difficult to quickly and cost-effectively evaluate artificial fracture parameters and understand fracturing results.By using the G-function and the basic theory of pressure decline analysis from unsteady well tests,a qualitative and quantitative post-fracturing evaluation method based on pump-shutoff pressure decline data was proposed.Taking two intervals in well H197-48 from a tight oil reservoir as examples,the complexity of the fractures was determined through the shape of G-function curve derived from the pressure decline data.Key reservoir and fracture parameters were analyzed using the pump-shutoff pressure decline curve quantitative interpretation technique.The results show that both the 11th and 16th stages formed complex fractures,each having four fractures with half-lengths of 134 m and 186 m,respectively.The stimulation effect in the 16th stage was superior to that in the 11th stage.These results,including fracture shape,number,and half-length,were consistent with high-frequency pressure monitoring analysis,validating the accuracy of the evaluation method.This post-fracturing evaluation method,characterized by its easy data accessibility,simple analysis process,low cost,and reliable interpretation results,makes it suitable for guiding the optimization of future fracturing designs.

关 键 词：致密油储层 主压裂施工 压后评价 停泵压降 G函数分析 裂缝形态 压降试井 

分 类 号：TE357[石油与天然气工程—油气田开发工程]