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Natural Gas Liquids Recovery & Stabilization Applications

Efficient removal of liquids from natural gas and stabilization of liquids for storage and transportation

At a natural gas wellhead, the emergent gas stream is saturated with C3+ hydrocarbons. Removal of these hydrocarbons to achieve a treated gas dew point of -20 degree celsius is necessary to prevent condensation at cold spots in the gas transportation pipeline. Recovered natural gas liquids (NGLs) are valuable and may be used for local energy generation or shipped off-site for further processing. In a few cases, the liquids could be reinjected at wellhead to maintain pressure of the formation. NGL stabilization is done to lower the CH4 and C2 components principally in these liquids. This lowers the vapor pressure of the liquids and allows storage and transportation at ambient pressures and temperatures safely. Subsequently these liquids may be used to dilute bitumen and heavy crudes for transportation.

Membrane Processes to Recover Natural Gas Liquids

The PEEK-SEP membrane platform can operate in condensing service and thus offers an intrinsically stable platform to separate hydrocarbon fluids as well as traces of water, methanol, etc. through the selection of the appropriate separation membrane. The low-pressure membrane stream may be recycled upstream of the booster compressor to knock out the liquids for separation and treatment.

Stabilizing Natural Gas Liquids

Natural gas liquids (NGLs) stabilization requires removal of volatile fractions of hydrocarbons from NGLs. These typically include ethane, propane and butane. Air Liquide Advanced Separations' (ALaS) PEEK-SEP membranes are well suited for this purpose in that they can separate the volatile fractions.