低渗透油藏压裂井产能分析

根据低渗透油藏的非达西渗流规律,建立并求解了常流压条件下垂直裂缝井双线性流数学模型,绘制并分析了产能理论曲线.研究表明: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.

Productivity analysis for fractured well in low permeability reservoir

According to non-Darcy percolation law in low permeability reservoir, a numerical model for bilinear flow in vertical fracture well under normal flowing pressure is established and solved, and productivity curve is drawn and analyzed. The result shows that, skin factor has a big impact on initial production of fractured well. The higher the skin factor is, the lower the initial production is. As production time increases, the impact of skin effect becomes disappearing. Starting pressure gradient mainly affects the productivity of fractured well in mid-late stage. The higher the starting pressure is, the faster the production declines. Therefore, the impact of starting pressure gradient must be considered when analyzing the productivity of vertical fracture well in low permeability reservoir.