METHOD AND SYSTEM FOR TREATING A FLOW BACK FLUID EXITING A WELL SITE

摘要

The present invention relates to a method and system for treating a flow back fluid (10) exiting a well site following stimulation of a subterranean formation. More specifically, the invention relates to processing the flow back fluid, and separating (200) into a carbon dioxide rich stream (20) and a carbon dioxide depleted stream (22), and continuing the separation until the carbon dioxide concentration in the flow back stream until the carbon dioxide concentration in the flow back gas diminishes to a point selected in a range of about 50-80 mol% in carbon dioxide concentration, after which the lower concentration carbon dioxide flow back stream continues to be separated into a carbon dioxide rich stream which is routed to waste or flare (94), and a hydrocarbon rich stream (16, 28) is formed.