沁水盆地煤层气井压裂效果评估研究

发布时间：2018-05-19 22:26

本文选题：煤层气井压裂 + 闭合压力　；参考：《煤炭科学技术》2017年09期

【摘要】：为了分析评估煤层气井压裂增产后的生产效果,以沁水盆地煤层气井为实例,通过G函数曲线、时间平方根曲线和双对数函数曲线预测煤层压裂裂缝闭合压力,并建立了煤层气井的地应力模型。基于该地应力模型的结果,将注入摩阻及停泵裂缝净压力2项指标与煤层气井压裂前后产能进行对比,并拟合了煤层气井平均日产气量与该2项指标之间的关系模型。结果表明:预测的煤层地应力与测试结果的误差仅为0.75 MPa;注入摩阻及停泵裂缝净压力与煤层气产能存在较好的相关性,压裂注入摩阻和停泵裂缝净压力越高,裂缝的复杂程度越高且延伸越困难,导致煤层气井产能越低。该理论方法可为煤层气井的地应力模型和压裂后产能效果预测提供参考。
[Abstract]:In order to analyze and evaluate the production effect of coalbed gas well after fracturing and increasing production, taking coal bed gas well in Qinshui Basin as an example, the closed pressure of fracture in coal seam is predicted by G function curve, time square root curve and double logarithmic function curve. The in-situ stress model of coalbed gas wells is established. Based on the results of the in-situ stress model, the injection friction and the net fracture pressure of the pump stop are compared with the productivity of the coalbed gas well before and after fracturing, and the relationship model between the average daily gas production rate of the coalbed gas well and the two indexes is fitted. The results show that the error between the predicted in-situ stress and the test results is only 0.75 MPA, and the net pressure of injection friction and stop pump fracture has a good correlation with the coalbed methane productivity, and the higher the net pressure of fracturing injection friction and stop pump fracture is, The higher the fracture complexity and the more difficult the extension, the lower the coalbed gas well productivity. The theoretical method can provide reference for the in-situ stress model of coalbed methane well and the prediction of productivity effect after fracturing.
【作者单位】：中海油研究总院;
【基金】：中海石油(中国)有限公司资助项目(YXKY-2016-ZY-08,FQTFWQYZL-14-071)
【分类号】：TE377

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