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基于返排产水数据的页岩气井压裂效果评价方法
王妍妍,刘华,王卫红,胡小虎,郭艳东,戴城
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(1.中国石化石油勘探开发研究院,北京100083;2.页岩油气富集机理与有效开发国家重点实验室,北京100083)
摘要:
对于页岩气藏,采用水平井多段压裂技术可在地层中形成一个复杂裂缝系统,实现经济有效开发,因此复杂裂缝系统的定量刻画对准确预测页岩气井产能具有重要意义。为分析早期返排产水数据并获取储层改造信息,假设裂缝内流体流动为径向流和线性流,考虑基质向裂缝系统供气对产水的影响,得到气井定产量生产时的水相渗流数学模型,结合物质平衡方程得到压力解,根据杜哈美原理将模型的适用范围扩展到气井放喷排液阶段变产量生产条件下。模型求解分析发现,当裂缝系统进入整体泄压阶段后,双对数坐标中规整化产水量和物质平衡时间的关系表现为斜率为-1的直线段,特征线分析可确定有效裂缝体积和裂缝形状参数。结合数值模拟技术对方法进行验证,并结合现场实例完成有效裂缝体积求取。研究结果表明,在进行产水数据分析时返排数据不可省略,否则获得的有效裂缝体积偏小。提出的方法为利用返排产水数据评价压裂效果提供了技术支撑。
关键词:  页岩气  压裂效果  返排  特征线诊断  裂缝体积
DOI:10.13673/j.cnki.cn37-1359/te.2019.04.019
基金项目:国家科技重大专项“彭水地区常压页岩气勘探开发示范工程”(2016ZX05061),中国石化科技部“川南深层页岩气开发气藏工程技术研究”(P17014),中国石化科技部“深层页岩气综合评价及开发技术政策”(P18058-1)。
Evaluation of shale gas well fracturing performance based on flowback water production data
WANG Yanyan,LIU Hua,WANG Weihong,HU Xiaohu,GUO Yandong,DAI Cheng
(1.Petroleum Exploration & Production Research Institute,SINOPEC,Beijing City,100083,China;2.State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development,Beijing City,100083,China)
Abstract:
Multistage fracturing of horizontal well technique is applied to develop shale gas reservoir economically and effectively,during which a complex fracture network is formed in the formation. Therefore,it is crucial to quantitatively describe the complex fracture network to achieve an accurate prediction of gas well productivity. In order to analyze early flowback water production data and to get reservoir stimulation information,a mathematic percolation model for water phase was proposed at the constant production stage of gas wells on the hypothesis of both radical flow and linear flow in single fracture considering the influence of gas flow from matrix to fracture on water production. Combined with material balance equation,the bottom hole pressure was obtained,and according to the Duhamel’s principle,the percolation model could be extended to the blowing off stage with a variable production rate. Analysis indicates that when the internal depletion flow appears in the whole fracture system,the relation curve between normalized water rate and material balance time in the loglog coordinate is a straight line with a slope of -1. Characteristic line diagnosis could be used to calculate the effective fracture volume and fracture shape parameters. The methods is verified by numerical simulation,and the effective fracture volume is calculated combined with field cases. Results show that the flowback data collected in the blowing off stage cannot be neglected,otherwise the effective fracture volume is relatively smaller. The proposed method provides the technical support for the evaluation of fracturing performance of shale gas wells with the use of flowback data.
Key words:  shale gas  fracturing performance  flowback  characteristic line diagnosis  fracture volume

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