氮气替挤技术作为一种新型海上原油停输管线扫线方式,逐渐成为研究的热点和发展方向。本文针对紧急状态下海上输油管线停输后的扫线需求,开展氮气替挤技术研究,通过开展室内试验,研究分层流等不同流态下的替挤流量、压力和含气率参数的发展变化规律,确定了各参数的变化规律和相互影响关系,为开展海上单井输油管线替挤工程的实施提供可靠的技术支持。 As a new method of wiping off the pipeline of crude oil off-shore, nitrogen alternative extrusion technology has gradually become the research hotspot and development direction. In this paper, aiming at the requirement of wharf after the shut-down of offshore oil pipeline under emergency condition, the research on nitrogen replacement technology is carried out. Through laboratory experiments, the development of parameters of gob-flow, pressure and gas content under different flow regimes, such as stratified flow, The law of variation and the relationship between the variation of each parameter and the mutual influence were determined, which provided reliable technical support for carrying out the replacement project of offshore single-well pipeline.