一种新型井下三级高效气液分离器分离特性实验

为解决高气液比油井井下气液高效分离的技术难题，开发设计了一种适用于多流型流体的井下三级高效气液分离器，建立了一套用于多流型的气液两相实验评价系统，实验中分离器入口液相流量为5~300 m3/d，入口含气率为5.0%~94.1%。实验研究结果表明，内筒体和外筒体之间的液位高度是保证分离器高效分离的关键指标。液位高度控制在合理临界液位下可实现在宽流程、高含气率、多流型，特别是振荡流型下气液混合物的高效分离，同时验证了该分离器具有较强的自适应能力，入口含气率在26.7%~94.1%范围内变化可实现高效的气液分离效率。该技术实现了井下小尺寸空间、高含气率、宽流程及多流型工况环境下气液高效分离，为海上油气田高含气井况电泵排液/举升的平稳运行提供有效解决方案。

Experimental on the separation behaviors of a new type of three-stage efficient downhole gas-liquid separator

In order to solve the technical difficulties in the efficient downhole gas-liquid separation of the oil wells with high gas/liquid ratio, this paper designed and developed a new type of three-stage efficient downhole gas-liquid separator suitable for multi-pattern fluid and established a set of gas-liquid two-phase experimental evaluation system suitable for multiple flow patterns. In the experiment, the liquid flow and void fraction at the inlet of the separator are 5~300 m3/d and 5.0%~94.1%, respectively. The experimental study results show that the liquid level height between inner cylinder and outer cylinder is a key index to ensure the efficient separation in the separator. If the liquid level height is controlled below the reasonable critical liquid level, gas-liquid mixture of wide flow, high void fraction and multiple flow patterns, especially oscillating flow pattern can be separated efficiently. What’s more, this separator is verified to have wider self adaptability. At constant inlet opening and outlet opening, efficient separation can be realized when the inlet void fraction varies in the range of 26.7%~94.1%. The technology realizes the efficient gas-liquid separation under the working conditions of downhole small space, high void fraction, wide flow and multiple flow patterns and provides the effective solution for the smooth operation of electric pump discharge/lifting in the wells with high void fraction in offshore oil and gas fields.