变形介质低渗透气藏水平井产能分析
Analysis on Horizontal Well Productivity in Low Permeability Gas Reservoirs with Deformation Medium
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- 引用格式:
-
熊健,李凌峰.变形介质低渗透气藏水平井产能分析[J].天然气与石油,2011,29(5):0.doi:
.Analysis on Horizontal Well Productivity in Low Permeability Gas Reservoirs with Deformation Medium[J].Natural Gas and Oil,2011,29(5):0.doi:
- DOI:
- 作者:
- 熊 健1 李凌峰2
- 作者单位:
- 1.西南石油大学，2.长江大学石油工程学院
- 关键词:
- 水平井；非均质性；压力敏感效应；启动压力梯度；表皮效应；产能预测
Horizontal well；Heterogeneity；Stress sensibility；Startup pressure gradient；Skin effect；Productivity prediction
- 摘要:
- 大量实验研究证实低渗透气藏中气体渗流需要克服启动压力梯度，同时气体渗流还要受应力敏感效应影响。针对变形介质低渗透气藏，利用保角变换等方法，考虑非均质性、压力敏感效应、启动压力梯度以及表皮效应等影响因素，推导出了水平井产量计算模型。研究表明，各种考虑影响因素对低渗透气藏水平井的产量影响呈近似线性变化关系；非均质性的影响程度最大，其垂向渗透率高将有利于水平井产量的提高。通过实例计算说明该模型产能预测结果的相对误差小。
A lot of laboratory researches have confirmed that startup pressure gradient and stress sensibility exist in low permeability reservoir. Based on the deformation medium in low permeability reservoir，considering nonuniformity，stress sensitivity，startup pressure gradient and skin effect，the conformal transformation method are used to derive output calculation model for horizontal well. The research results show that the effect of different factors on output of horizontal well in low permeability gas reservoir presents an approximate linear change relation，nonuniformity has the max effect and its high vertical permeability is beneficial for output increase of horizontal well. Calculation results obtained from examples show that relative error of productivity prediction calculated through the model is small.
