Detection of transient gas-liquid flow structures in horizontal shale gas well using wire-mesh sensor

On the life and habits of gas-core slugs: characterisation of an intermittent horizontal two-phase flow

“…This three-way transition region between stratified, intermittent and annular flow that yields a pseudo-slug area, as identified by Lin and Hanratty [8], has not been sufficiently addressed in the literature. Even though horizontal pseudo-slugs has gained increasing attention in recent years, there is no general agreement on the characteristics of a pseudo-slug [9][10] [11][12] [13]. A study in air-water horizontal flow found that two spatial structures coexist in that pseudo-slug zone [14].…”