Crimson Lake Plant NGL Recovery Study
Obsidian Energy Ltd. | Crimson Lake, AB
Journey Engineering Corp. (Journey) completed a process engineering study on the liquid recovery at the Crimson Lake Gas Plant to uncover any inefficiencies in the processing equipment and produce recommendations to increase the production of natural gas liquids (NGLs) to increase the profitability of the facility.
A simulation for the gas and NGL processing sections of the gas plant was developed and the capabilities of the following pieces of equipment were assessed: Gas-Gas & Gas-Liquid Heat Exchangers, Chiller, Low Temperature Separators, NGL Pumps, De-ethanizer Tower & Reboiler, De-ethanizer Overheads Reflux Condenser, Accumulator, and Reflux Pumps.
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Journey found that the vortex tube separation device in the Gas-Liquid Low Temperature Separator is being operated outside the pressure it was intended to run at, which has caused some NGL carryover to the sales gas stream lowering the plant’s overall liquid recovery.
We also identified other improvements that could be made to increase the liquid recovery. These improvements consider the equipment limitations as well as the controllable process parameters. When the reflux temperature was reduced to -28.8°C and the De-ethanizer Tower pressure increased to 3,050 kPag, the NGL production rate was predicted to grow by 6%.