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 exiting a well site following stimulation of a subterranean formation. More specifically, the invention relates to processing the flow back fluid, and separating into a carbon dioxide rich stream and a carbon dioxide depleted stream, 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, and a hydrocarbon rich stream is formed.

主权项

1. A method of treating a flow back fluid exiting a well site following stimulation of a subterranean formation, wherein the method comprises:
processing a flow back fluid exiting a well site, and separating the flow back fluid into a carbon dioxide rich stream and a carbon dioxide depleted stream, wherein the carbon dioxide rich stream is further processed to form a liquid carbon dioxide product, while the carbon dioxide depleted stream is utilized in downstream processing to aid the formation of said liquid carbon dioxide product; continuing to separate the flow back fluid into a carbon dioxide rich stream and a carbon dioxide depleted stream until the carbon dioxide concentration in the flow back gas diminishes to a point selected within 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, and a hydrocarbon rich product streams are formed.