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针对低渗透油藏水力压裂后形成的有限导流垂直裂缝,建立了考虑启动压力梯度低渗透油藏垂直裂缝井产量递减分析数学模型,并进行了求解,绘制了相应典型曲线,分析了曲线特征,并对参数敏感性进行了分析,同时分析了启动压力梯度对实例井产能的影响。研究表明,存在启动压力梯度低渗透油藏有限导流垂直裂缝井产量比不存在启动压力梯度时递减更快,这种差别在生产中后期尤为显著。实例分析表明,启动压力梯度对低渗透油藏压裂后产能影响较大,不应被忽略。
Aimed at the limited vertical diversion fractures formed after hydraulic fracturing in low permeability reservoirs, a mathematic model of production decline analysis of vertical fractured wells with low pressure permeability and low permeability was established and solved. The corresponding typical curves were plotted, and the curves Characteristics, and parameter sensitivity analysis, analysis of the start-up pressure gradient on the productivity of instance wells. The results show that the production of the limited vertical diversion fractured well with low pressure gradient and low permeability reservoir is faster than that without the initial pressure gradient, which is especially noticeable in the middle and late period of production. The case study shows that the start-up pressure gradient has a great influence on the post-fracturing productivity of low-permeability reservoirs and should not be neglected.