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低渗透油藏污染井压裂增产率预测模型及敏感性分析

Journal of China University of Petroleum(Edition of Natural Science)(2010)

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Abstract
针对低渗储层压裂改造后裂缝作用半径内等效启动压力梯度减小的问题,在低渗压裂污染井产能预测模型中引入含启动压力梯度的低速渗流方程,推导径向稳态渗流条件下污染井压裂后增产率预测模型,并对压裂污染井产能影响因素进行分析。结果表明:启动压力梯度的变化对低渗污染井改造后产能影响较大;不同启动压力梯度下,裂缝半长、宽度对增产率的贡献存在差异,且裂缝参数及表皮因子改善程度对增产率贡献均存在最优值。
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Key words
incremental recovery,start-up pressure gradient,low-permeability reservoir,fracturing
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