Benefits of Fast-Cycle PSA in an Oil Production Facility case study

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Courtesy of Xebec Adsorption Inc.

Plains Exploration and Production Company (PXP)
Situation: Limited oil production capacity caused by a difficult-to-operate, under-sized low-temperature separation unit (LTS)
Solution: Installation of a Xebec Fast-Cycle Pressure-Swing Adsorption (PSA) Unit to remove heavier hydrocarbons from field gas to meet sales gas specifications
Benefits: Lower Cost, Increased Capacity, Fewer Fugitive Emissions, Shorter Lead Time
Location: Los Angeles Basin, California

Building a Better Purification System
Plains Exploration & Production (PXP), an oil producer located in downtown Los Angeles, was struggling to meet California's new and more stringent sales gas specifications for ethane and heavier hydrocarbons. Oil production had to be decreased due to limited capacity of their LTS unit, which was used to dehydrate and de-rich the field gas from the oil wells to produce sales gas. Gas production in an oil field is a necessary function of oil production. Therefore, a limitation in gas throughput automatically drives a decrease in oil production, resulting in revenue loss. A new LTS unit was considered, however, it would have taken over 12 months to come online and a multi-million dollar capital investment would have been required. Additionally, due to space limitations and installation requirements, start-up of a new LTS unit would have disrupted oil production by several weeks, resulting in an unacceptably high total project cost. PXP turned to Xebec for a better solution.

XEBEC'S Design
XEBEC engineers re-designed the gas processing system to incorporate the use of XEBEC's Fast-Cycle PSA unit. The new system cost less than one-third of a new LTS unit, and by reusing the existing LTS to improve methane recovery, the gas throughput capacity doubled. As an added benefit, the basic design of the Fast-Cycle PSA incorporated the use of a single rotary valve to replace the multitudes of valves found on conventional PSA technologies. This reduced the potential for fugitive emission levels, resulting in a quickened permitting process. From design to start-up, the entire project time took less than eight months. And by incorporating the use of existing equipment, disruption to the operation was minimized.

The Redesigned Facility in Los Angeles
In the re-designed facility, the PSA processes field gas from the oil wells to sales gas specifications. Tailgas from the XEBEC Fast-Cycle PSA is compressed then chilled through the old LTS unit producing gas which is combined with the product stream from the PSA and natural gas liquids (NGL's). The liquids are then stabilized for sale, while vapors from the NGL Stabilizer are processed in a MicroTurbine to generate electricity for re-use by the producer, as shown in Figure 1.

Results
The XEBEC Fast-Cycle PSA has been successfully integrated with virtually no operating and/or performance issues. Sales gas meets and/or exceeds California's new regulatory gas specifications, where the sales gas quality is monitored and can be controlled. Given the high reliability of the gas processing equipment, operating personnel can now devote more time to maximizing oil production.

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