水平井筒油水两相流压降计算模型

A computation model of pressure drop for oil-water two phase flow in horizontal well

水平井的应用已越来越广,由于其增产效果明显,特别是对于底水油藏,能有效地延缓地水锥进的速度,从而为油田创造巨大的经济效益。以前人们都普遍把水平井视为无限导流,即:从根端段到指端段几乎没有压降消耗。但是随着水平井的技术越来越成熟,大位移水平井开始出现,水平井筒中的压降已不容忽视。对水平井筒油水两相变质量分层流动进行了微元分析,考虑壁面入流对其中油水两相变质量分层流动压降的影响,运用连续性方程和动量守恒方程,得出了水平井筒油水两相变质量分层流动的基本模型和压降计算模型,通过模型求解揭示了在壁面入流条件下沿水平井筒的压降分布。

Application of horizontal well has become more extensive and more extensive. The horizontal well can effectively delay the speed of water coning, creating the huge economic benefits for oilfield because of its obvious stimulation effect, especially for bottom water reservoirs. Formerly, people generally regarded the horizontal well as the infinite conductivity well, namely there is no pressure drop consumption nearly from root tip section to finger tip section. However, with horizontal well technology more mature and more mature, the extended horizontal well has begun to emerge, so the pressure drop can not be ignored in horizontal well. This paper conducts the infinitesimal analysis for the differential flow of variable mass flow in oil-water two phase. Considering the influence of wall inflow on the pressure drop of differential flow of variable mass flow in oil-water two phase, the computation model of pressure drop and the basic model of differential flow of variable mass flow have been obtained for oil-water two phase of horizontal well by using the continuity equations and momentum conservation equations. The pressure drop distribution along horizontal well has been revealed through model solution under the condition of wall inflow.