底水油藏水平井水淹规律经验模型

在底水油藏开发过程中,水平井以泄油面积大、生产井段长、井底压降小等优势,得到了广泛应用。然而,由于底水的存在及井身结构的原因,水平井在开采过程中更易产水。文中针对底水油藏水平井开采时的水淹问题,综合考虑了水平井水平段长度、避水高度、油水黏度比、渗透率级差和采液强度等影响水平井出水的因素,应用渗流力学知识,将众因素有效组合成2个未知参数,在此基础上,建立了它们与水平井含水率及含水上升率之间的经验关系式,并编制了水平井水淹规律计算软件。该软件能较快速、准确地描述底水油藏水平井开发的含水率及含水上升率变化规律,为进一步发挥水平井在底水油藏开采中的技术优势、扩大水平井的应用规模提供了理论依据。

Empirical model of waterflooded law of horizontal wells in bottom water reservoir

Because of large drainage area,long producing interval,small bottom hole pressure drawdown and other advantages,the horizontal well technology has been widely used in the development of bottom water reservoir.However,the existing of bottom water and well profile of horizontal well made the horizontal well produce water more easily.Aiming at the waterflooded problem of horizontal well in bottom water reservoir and considering the factors such as horizontal length,water-avoiding distance,oil-water viscosity ratio,permeability contrast and fluid producing intensity which affect water producing of horizontal well,this paper combined all influence factors into two unknown parameters using percolation mechanics knowledge,established the empirical formula and obtained the calculation software of waterflooded law.This calculation software can quickly and accurately calculate the water ratio and increase rate of water cut for the horizontal well in bottom water reservoir,which can provide a theory basis for exerting technical advantage and expanding the application range of horizontal wells in bottom water reservoir.