Influence of riser-induced slugs on the downstream separation processes

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9 Citations (Scopus)


In Oil & Gas installations the severe slug is an undesired flow regime due to the negative impact on the production rate and facility safety. This study will evaluate the severe riser-induced slugs’ influence to a typical separation process, consisting of a 3-phase gravity separator physically linked to a de-oiling hydrocyclone, based on experimental tests performed on a laboratory testing facility. Several scenarios are compared, while three PID controllers’ coefficients are kept constant for all the tests: The separator pressure, water level, and hydrocyclone pressure-drop-ratio (PDR) controllers. Each respective scenario makes a comparison between uncontrolled, open-, and closed-loop anti-slug control configurations. It is concluded that both open- and closed-loop anti-slug control strategies improve the water level and PDR setpoint tracking equally well, but that the closed-loop strategy gives the best average production rate. Furthermore, it is confirmed that a PWT-ecient riser bottom pressure (Prb) anti-slug control strategy has to guarantee stabilization of the mass inflow rate to the separator for archiving acceptable hydrocyclone separation. A stable !sep;in is observed not to be directly linked to a stable Prb.
Original languageEnglish
JournalJournal of Petroleum Science and Engineering
Pages (from-to)337-343
Number of pages7
Publication statusPublished - Jun 2017


  • Oil & gas
  • Multi-phase flow
  • Anti-slug
  • Riser slug
  • Separation
  • Hydrocyclone
  • Stabilization


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