三重介质页岩气藏分段压裂水平井产能预测模型

发布时间：2018-01-31 10:18

  本文关键词： 页岩气藏 分段压裂水平井 三重介质 典型曲线 影响因素 产能预测　出处：《大庆石油地质与开发》2016年01期 　论文类型：期刊论文

【摘要】：基于传统的三重介质模型,建立了考虑基质向人工裂缝窜流和未压裂区产能贡献的裂缝性页岩气藏分段压裂水平井的三重介质产能预测模型,并得到了Laplace空间下的解析解,采用Stefest数值反演绘制了无因次产量随时间变化的双对数产量典型曲线,划分出8个流动阶段,最后对影响裂缝性页岩气藏分段压裂水平井产量典型曲线的主要因素进行了分析。分析结果表明:储容比对产量典型曲线影响较小;3个窜流系数对产量典型曲线的不同阶段有着明显不同的影响;人工裂缝半长和气藏宽度对产量典型曲线中期和后期有着较大的影响;敏感性分析也证实了基质向人工裂缝窜流和未压裂区产能贡献的必要性。研究结果为裂缝性页岩气开发动态预测提供了理论方法,对页岩气开发的产能预测和动态分析具有一定的指导意义。
[Abstract]:Based on the traditional triple medium model, a triple-medium productivity prediction model for fractured shale gas reservoirs with segmented fracturing horizontal wells is established considering the contribution of matrix to artificial fracture channeling and productivity in non-fracturing area. The analytical solution in Laplace space is obtained, and the typical logarithmic yield curve of dimensionless output varying with time is drawn by Stefest numerical inversion, and eight flow stages are divided. Finally, the main factors influencing the typical production curve of fracturing horizontal wells in fractured shale gas reservoirs are analyzed. The results show that the ratio of reservoir to capacity has little effect on typical production curves. The three channeling coefficients had different effects on different stages of typical yield curve. The half length of artificial fracture and the width of gas reservoir have great influence on the middle and late stage of typical production curve. Sensitivity analysis also confirmed the necessity of matrix to artificial fracture channeling and productivity contribution in unfractured area. The results provide a theoretical method for prediction of fractured shale gas development performance. It has certain guiding significance for the prediction and dynamic analysis of shale gas production capacity.
【作者单位】： 中国石油大学石油工程学院;中国石油长庆油田分公司第五采气厂;中国石油塔里木油田勘探开发研究院;北京东方远望科技有限公司;
【基金】：国家重大科技专项(2011ZX05013-006)的部分研究内容
【分类号】：TE328
【正文快照】： 水平井分段压裂技术是高效开发页岩气藏的重要手段,页岩气藏虽然储层致密,但天然裂缝往往较为发育,压裂后气藏压裂区(SRV区)存在不和井筒的作用,天然裂缝和人工裂缝对产能有着明显不同的作用,不能简单地平均为一种裂缝介质。此外,目前已有的三重介质模型认为,流体只能由 同性，

本文编号：1478831