Schlumberger

Industry Article: Know Your Stuff

An efficient and cost-effective gas treating system

Know Your Stuff
Publication: Other industry publication
Publication Date: 08/01/2015

In the area of gas processing, designing onshore and offshore treating systems that stay within a capex budget can certainly be challenging, and is largely dependent on the type of gas being treated.

To identify the key cost-inducing variables for a gas processing facility, most planners start with a basic premise: the cost of treating a gas stream to obtain the required levels of purity must be low enough and the revenue realized from its subsequent sale must be high enough to justify the overall processing investment.

To meet pipeline transmission specifications, processing operations treat or condition produced gas that contains acid gases: hydrogen sulfide (H2S), carbon dioxide(CO2), or both. These acid gases are removed because they lower the heating value of natural gas and accelerate the corrosion of pipelines and transmission control equipment.

Because liquid amine processing systems are so complex, involve high equipment costs, and use liquid-based processing, their operating weight generally makes them impractical for use on offshore platforms. An alternative to the amine process is the membrane treating system, which treats produced gas through the use of polymer-based material to separate CO2 and H2S from gas streams.



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