压裂井产能预测理论曲线分析

ANALYSIS ON DELIVERABILITY PREDICTION THEORETIC CURVE OF FRACTURED WELL

目前水力压裂已成为勘探开发低渗透油藏较为常用且相当有效的增产措施。针对具有启动压力影响的低渗透储层压裂井的不稳定产能预测理论曲线进行了分析研究。分析结果表明,表皮系数对压裂井的初期产量影响较大。表皮系数越大,裂缝井初期产量就越低。随生产时间增长,表皮效应的影响逐渐消失。启动压力梯度主要影响压裂井的中后期产能,启动压力越大,产量下降就越快。因此,在进行低渗透油藏垂直裂缝井产能分析时,必须考虑启动压力梯度的影响。

Hydraulic fracturing has become a common and quite effective well stimulation technology to explore and develop low permeability reservoirs.The deliverability prediction theoretic curve of fractured well in low permeability reservoirs with threshold pressure effect is studied in this paper.The result shows that the skin factor has a relative big effect on the initial output of a fractured well,the bigger the skin factor,the lower the initial output is.However,the effect of skin factor will disappear gradually with the increase of production time.The threshold pressure gradient affects mainly the middle-late period output of a fractured well,the higher the threshold pressure is,the faster the output declines.As a result,the effect of threshold pressure gradient must be considered when the deliverability analysis is carried out on a vertical fractured well in low permeability reservoirs.