Abstract: In order to investigate the phenomenon of gas⁃liquid bias in parallel separators in oil⁃gas gathering and transportation system, an experiment facility for gas⁃liquid two⁃phase splitting was designed, constructed and instrumented. Flow rates, pressure, pressure drop，liquid level and liquid holdup were measured and recorded by data⁃acquisition system. Gas⁃liquid splitting pipelines of two geometries (horizontal pipeline⁃T junction⁃ horizontal pipeline and horizontal pipeline⁃T junction⁃vertical pipeline) were constructed. Experiments on splitting of slug flow were carried out and splitting characteristics of gas⁃liquid were studied with symmetrical and asymmetrical pipeline conditions. When the pipeline conditions are symmetrical, the two phases of slug flow splitting into two separators are even for pipelines of two geometries. When the pipeline conditions at the outlets of separators are asymmetrical, mal⁃distribution of both two phases occurs and liquid tends to split more evenly than gas. Based on the calculation of pressure drop, a splitting model was established and the influence of gas⁃liquid velocity on the flow characteristics was explained simply.

Key words: Multiphase, Splitting, Mal?distribution, T junction, Slug flow, Experimental investigation

摘要： 为了研究油气集输系统中并联分离器出现的气液偏流现象，自主设计并搭建了气液两相流分流实验系统。该实验系统中采用数据采集系统对流量、压力、压降、液位、持液率等多种实验参数进行记录。设计了两种结构的气液分流管路，并在两种管路结构（水平管⁃T型管⁃水平管结构与水平管⁃T型管⁃立管⁃水平管结构）下进行了段塞流分流实验，分别研究了对称管路条件与非对称管路条件下的气液分流特性。实验结果表明，两种管路结构下，当管路条件对称时，在实验流速范围内，段塞流的气液两相等流量分配到两台并联分离器内；对于实验中的两种管路结构，分离器气相出口管路条件的不对称会引起气、液两相的偏流，且液相的偏流程度均小于气相。基于压降计算建立了非对称条件下气液两相流的分流模型，对气液流速对分流特性的影响进行了简单解释。

关键词: 多相流, 分流, 偏流, T 型管, 段塞流, 实验研究