基于压后长期生产动态的致密气藏压裂效果评价  

Post-fracturing analysis of tight gas reservoir based on long-term production data

作　　者：苏畅 SU Chang(Geojade Petroleum,Beijing 100015)

机构地区：[1]洲际油气股份有限公司,北京100015

出　　处：《世界石油工业》2025年第2期99-109,共11页World Petroleum Industry

基　　金：“十三五”国家科技重大专项“东海深层低渗-致密天然气勘探开发技术”(2016ZX05027)。

摘　　要：为了探究影响致密气井压裂改造后生产效果的决定性因素,破解测井、微地震等静态监测技术难以直接评价压裂井产能和累计可采气量等关键指标的难题,推动致密气藏高效开发,开展了压后动态诊断方面的探索研究。采用基于Wattenbarger压裂井非稳态产量解析式,搭建了一套涵盖1/q与√t、1/q与Q/q关系诊断图以及流态识别的动态分析技术体系。研究结果表明,该技术摆脱了对测压资料及大量地质信息的依赖,仅借助长期生产的日/月产气量数据,便能获取压裂井流动能力(4A√K)、压裂改造体积(SRV)以及最终经济可采储量(EUR)等关键参数。在美国大绿河盆地Pinedale气田80口压裂气井开展的实例应用结果表明,发现气井初始最大月产气量、SRV、EUR等关键指标均与4A√K呈正相关关系,气井能实现高初始产量与高累计产量,得益于其较大的4A√K值。结论认为,所建立的压后动态分析技术,具有操作简便、数据获取容易、分析结果丰富等优势。该技术为致密气藏压后动态诊断与压裂效果评价,提供了一种可靠且可行的有效工具,具有指导意义与应用价值,有助于推动致密气藏开发技术的进一步发展。In order to explore the decisive factors of the production effect after fracturing in tight gas wells,overcome the problem that static monitoring technologies such as logging and microseismic are difficult to directly evaluate key indicators such as the productivity and cumulative recoverable gas production of fractured wells,and promote the efficient development of tight gas reservoirs,this study has carried out exploration in post-fracturing dynamic diagnosis.Based on the unsteady production analytical formula of Wattenbarger fractured wells,a dynamic analysis technical system covering diagnostic diagrams of the relationships between 1/q vs√t and 1/q vs Q/q,and flow regime identification was established.The research results show that this technology gets rid of the dependence on pressure measurement data and a large amount of geological information.Only by means of daily/monthly gas production data from long-term production,key parameters such as the flow capacity(4A√K)of fractured wells,the stimulated reservoir volume(SRV),and the ultimate economic recoverable reserves(EUR)can be obtained.Through the practical application of 80 fractured gas wells in the Pinedale gas field of the Greater Green River Basin in the United States,it is found that key indicators such as the initial maximum monthly gas production,SRV,and EUR of gas wells are all positively correlated with 4A√K.The high initial production and high cumulative production of gas wells benefit from their large 4A√K values.It is concluded that the post-fracturing dynamic analysis technology established in this study has the advantages of simple operation,easy data acquisition,and rich analysis results.This technology provides a reliable and practical effective tool for post-fracturing dynamic diagnosis and fracturing effect evaluation of tight gas reservoirs,and has important guiding significance and application value both in theoretical aspects and in actual production,and is expected to promote the further development of tight gas reservoir deve

关 键 词：压后动态分析 压裂效果评价 动态诊断 气田实例分析 美国大绿河盆地 

分 类 号：TE35[石油与天然气工程—油气田开发工程]