关键词: 水平井, 两相流动, 变质量, 流型, 分层流动, 分散泡状流动, 间歇流动, 环空雾状流动

Abstract: Flow in wellbore is avariable mass flow with wall inflow or outflow.Given specific flow condition for the gas/liquid wellbore flow,first we need to identify the flow pattern occurring in the wellbore before we can apply a mechanistic model to predict the desired parameters.Due to similarities and difference between gas/liquid two phases flow in a regular horizontal pipe and in a horizontal wellbore,it is anticipated that some transition criterions valid for regular pipe flow need modification or extension for wellbore flow. According to the mechanism of the rapid growth of waves,we can obtain the following methods:to judge the transition from stratified to non-stratified flow pattern in horizontal wellbore on the basis of research of Taitel and Dukler;to judge the transition from dispersed bubble to intermittent flow pattern in horizontal wellbore by force analyzing of dispersed bubble;to judge the transition from annular mist to intermittent flow pattern in horizontal wellbore by conbining studys of Barner and Brauner.As a result, a new method to judge the four basic flow patterns of gas/liquid two phases variable mass flow in horizontal wellbore can be gained.

Key words: horizontal well, two phases flow, variable mass, flow pattern, stratified flow, dispersed bubble flow, intermittent flow, annular mist flow