水平油井IPR方程的建立与对比

Establishment and comparison of the IPR equations for horizontal wells

引用等效驱动半径的概念和方法,将水平油井转成产量相同、形式相同的垂直油井,进而利用垂直油井的研究方法得到了水平油井的二项式方程,建立了利用单点测试资料预测水平油井绝对无阻流量和流入动态曲线的IPR方程。目前国外仅有针对溶解气驱条件,利用油藏数值模拟所得数据,由统计研究建立的Bendakhlia&Azis和Cheng 2个IPR经验方程。对比表明,本文提出的IPR方程与国外的2个IPR方程形式相同,函数关系相反,更具理论基础。

Based on the concept of equivalent drainage radius for vertical wells,the production equation of horizontal wells is transformed to that of vertical wells which has the equivalent production rate. Also,the binomial formula is established to predict the absolute open flow rate and inflow performance relationship curve for horizontal oil wells through single point drawdown test. So far,there are merely two IPR equations for horizontal oil wells abroad,namely,the Bendakhlia and Azis＇ s equation and Cheng＇s revised formula. These two IPR equations were built from reservoir numerical simulation under solution gas drive condition. Compared to the equations abroad,the equation founded in this paper has the same form but opposite functional relationship and also has stronger theoretical basis.