边底水油藏注水开发条件下水平井临界产量研究

Critical Production of Horizontal Well under Condition of Waterflooding Development in Reservoirs with Edge and Bottom Water

边底水油藏注水开发时由于重力分异作用产生次生底水,采用合理的产能是减缓底水脊进的重要手段。利用油藏工程方法推导了含油高度、含水高度随累产油的变化关系。采用等值渗流阻力法,结合底水驱动垂向临界速度得到了见水前油藏水平井开发的临界生产压差。最后应用势的叠加原理,得到了考虑重力势影响下的水平井的临界产量公式。该方法可为边底水油藏在注水开发条件下不同采出程度的水平井确定合理产能提供理论依据。

During waterflooding development of reservoirs with edge and bottom water,secondary bottom water is produced due to gravity differentiation.It is an important way to slow down bottom water ridge by using reasonable productivity.By using reservoir engineering method,the relationship between oil-bearing height and water cut height and cumulative oil production is proposed.The critical production pressure difference of horizontal well development in reservoir before water breakthrough is obtained by using the equivalent seepage resistance method and the vertical critical velocity of bottom water drive.Finally,based on the superposition principle of potential,the critical production formula of horizontal well considering the influence of gravity potential is obtained.The application of this method can provide a theoretical basis for determining the reasonable productivity of horizontal wells under different cumulative oil production conditions of waterflooding development in edge and bottom water reservoirs.