一维水驱油恒压驱替渗流过程推导

为研究常规砂岩油田注水开发过程中的多油层开采动态、层间干扰、开发效果分析等,对一维水驱油恒压驱替渗流过程进行理论推导.结果表明:在采出端见水前,通过油水两相区压力、纯油区压力及总压差之间关系,结合Buck-ley-Leverett方程,建立累计注入量与注入时间的关系,以及见水前位置、时间、含水饱和度之间的数学关系,求解前缘位置、前缘压差、注入速度等参数随时间的变化;在采出端见水后,分析注入速度与采出端含水饱和度关系、累计注入量与采出端含水饱和度关系,以及采出端含水饱和度与时间的关系,建立见水后位置、时间、含水饱和度之间的数学关系,求解见水后出口端含水饱和度、注入速度等参数随时间的变化.该结果为驱替过程中各物理量随时间的变化、含水饱和度的分布、各物理量之间的理论关系等研究提供指导.

The derivation of one-dimensional displacement of oil by water in constant pressure

The displacement of oil by water of one-dimensional in constant pressure was derived for studying multilayer production,interlayer interference,analysis of development.The result shows that there is a mathematical relation among the location,the time and the water saturation when oil is displaced by water.Before producing water at the exit,we used Buckley-Leverett equation to get the relation between time and total injection through the relation among the pressure of mix zone,the pressure of pure oil zone and the total pressure.Based on this relation we can get the result told above before producing water at the exit.After producing water at the exit,we got the relation between time and the water saturation of exit through the relation between injection rate and time and the relation between total injection and water saturation of exit.Based on this relation we can get the result told above after producing water at the exit.Based on this result,we can get the rate of injection,the distribution of water saturation,the location of water front etc. in different time.