考虑入流角的水平井筒混合损失模型

对水平井的孔眼入流处的微元段进行了流动分析,根据气、液两相的连续性方程、动量方程和能量方程,在相间不存在传质和等温稳态流动等条件下,得到了气、液两相的混合损失计算模型.根据得到的模型,计算了不同入流角条件下水平井筒混合损失的值,结果表明:入流角对混合损失的影响较大,在不影响产量等条件下,应尽量采用小于90°的入流角,有利于减小井筒的压降.本模型对改变传统的射孔方式、鱼刺型分支井和压裂水平井的研究具有一定的指导意义.

Model of Mixture Loss Considering Influx Angle in Horizontal Well

The flow of the differential section at the perforation of horizontal well was analyzed in the paper.According to the continuity equation,the momentum equation and energy equation of gas and liquid phase,the mixture loss model of the gas and liquid phase under the condition of having no mass exchanging between gas and liquid,isothermal and steady flow was gotten.The mixture loss of horizontal bore through the model was calculated.The result indicated that the influx angle had more influence to the mixing loss.Under the condition of no influence to the output,we should do ourselves best to adopt the influx angle smaller than 90 degrees.This model had the directive significance to research the change of traditional perforation way,sidetrack horizontal well and fracturing horizontal well.