产量递减规律与水驱特征曲线的关系

The Relationship of the Production Decline and the Water Drive Curve

建立了不同条件下Arps、Logistic产量递减方程与不同水驱特征曲线之间的对应关系,使得这2个油田开发基本规律不再完全孤立、互不相关。研究表明:在油田渗流条件保持基本不变的条件下,符合某一递减方程的油相渗流特征,若能与水相渗流特征一起构成某一种水驱特征曲线的油水相渗比值关系式,那么产量递减方程与水驱特征曲线之间存在必然的联系:在油田渗流条件发生变化的条件下,若Qw+nO。保持为某一常数,那么水驱特征曲线I～Ⅲ的产量递减方程均服从双曲递减,水驱特征曲线Ⅳ[m=1]产量递减方程服从调和递减;若Qw+nQ。=kexp（st）,水驱特征曲线Ⅳ[m=1]的产量递减方程服从Logistic产量递减。

In different conditions, the correspond relationship between the Arps and Logistic production decline equations and the different water-drive curves are established,which make these two basic field development laws no longer isolate. The results indicated that:(1) On the assumption that the field seepage condition keeps unchanged,if oil relative permeability which is true of a decline equation and water relative permeability constitutes the formula of oil-water relative permeability ratio corresponded to a water-drive curve, there is certain relationship between the production decline equation and the water-drrve curve. (2)On the assumption that the field seepage condition changes,if the value of QW + nQo keeps constant,all the production decline equations of the water drive-curves I ~ Ⅱ follow hyperbolic decline, and the production decline equation of the water drive-curve Ⅵ (m = 1) follows harmonic decline;if the formula Qw + nQ0 = kExp(st) is true, the production decline equation of the water-drive curve Ⅵ (m=l) follows Logistic production decline.