Separator Jetting – Discharge Slurry Profiles (B-FSM-128)
Both spray and cyclonic jetting result in discharge of concentrated slurry from the cleaned vessels. Their profiles are similar and knowledge of the concentration is required to design the subsequent piping and dewatering systems.
The discharge profile from a cyclonic jetting system is shown as the header graphic, while that of the traditional jetting (from Priestman paper) is shown below.
Both systems start with high solids. The cyclonic jetting slurry is lower at 36 vol.% (60 wt.%) while the spray jet is at 70 vol.%. This is a function of the cyclonic jet pulling the slurry up – resulting in dilution in-situ – versus the jet system pushing the slurry down.
Jetting is “done” when outlet solids reach <5 vol.% solids. That timing depends on level of solids in the vessel prior to jetting, but if done frequently/properly jetting should be complete in 10-15 minutes.
Next week I will start the discussion discharge slurry piping for jetting systems.
References:
- Priestman, G.H., Tippetts, J.R., Dick, D.R., “The Design and Operation of Oil-Gas Production Separator Desanding Systems”, Trans IChemE, Vol. 74, Part A, March 1996, pp. 166-176.
- Rawlins, C.H., “Design of a Cyclonic Solids Jetting Device and Slurry Transport System for Production Systems”, paper 166118, presented at the SPE Annual Technical Conference and Exhibition, New Orleans, LA, 30 September – 2 October, 2013. https://doi.org/10.2118/166118-MS
