裂缝导流能力优化研究

Study on fracture conductivity optimizing.

利用压裂油井产能预测模型 ,研究了无因次裂缝导流能力对缝内流量分布规律及地层流体流入井底流动模式的影响。裂缝参数分析结果表明 ,对于渗透率大于 1× 10 -3 μm2 的地层 ,常规压裂所获得的无因次裂缝导流能力普遍偏小 ,没有发挥裂缝应有的导流作用 ,影响了压裂效果。在技术条件允许的情况下 ,对低渗透地层实施脱砂压裂 ,能限制缝长 。

The influence of dimensionless fracture conductivity on the rule of flowrate distribution in the fracture and on the flow pattern of formation fluid flowing into downhole is studied with the productivity prediction model for fractured oil well. The study on analysis of fracture parameters indicated that the dimensionless fracture conductivity resulted from conventional fracturing is generally too low when formation permeability is more than 1×10 -3 μm 2 , thus the effect of fracture to production stimulation is limited. It is proposed that tip screen-out fracturing technique should be possibly used in low-permeability formations to get effective fracture with short length and high conductivity, if technical conditions permitted.