井筒压降对水平井注采系统的影响研究

Research on the Influence of Pressure Drop on Injection-production System of Horizontal Wells

根据质量守恒方程和动量定理,建立了具有管外环空并考虑井筒压降的水平井模型。根据油水两相渗流理论,建立了储层模型并根据耦合条件对水平井模型进行了耦合并求解。以胜利油田某区块地质参数为依据建立了水平井一注一采时的油藏模型,对跟端对跟端以及跟端对趾端两种水平井排布方式分别进行了模拟。模拟结果表明,跟端-跟端排布时随着生产的进行产液剖面越来越不均衡;而跟端-趾端排布时产液剖面存在自动均衡现象,有助于提高原油采收率。

According to mass conservation equation and theorem of momentum, the mathematical model of hori- zontal well with annulus and frictional resistance is built. According to oil-water two phase seepage theory, a reser- voir model is built and coupled with the horizontal well model. Taking the actual parameters of a block in Shengli oil filed as reference, the reservoir with a horizontal injection well and a horizontal production well is built and dif- ferent well patterns are simulated. The results show that the fluid production profile of the ＂toe to toe＂ pattern be- comes more and more unbalance when the production goes on. On the contrary, the ＂toe to heel＂ pattern is helpful to balance the fluid production profile and increase oil recovery.