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1. (WO2015116357) METHOD AND SYSTEM FOR TREATING A FLOW BACK FLUID EXITING A WELL SITE

Pub. No.:    WO/2015/116357    International Application No.:    PCT/US2015/010466
Publication Date: Fri Aug 07 01:59:59 CEST 2015 International Filing Date: Thu Jan 08 00:59:59 CET 2015
IPC: E21B 43/16
E21B 43/26
E21B 43/40
C10L 3/10
C10G 31/06
Applicants: PRAXAIR TECHNOLOGY, INC.
Inventors: BURGERS, Kenneth, L.
DRNEVICH, Raymond, F.
SHAH, Minish, M.
THOMPSON, David, R.
Title: METHOD AND SYSTEM FOR TREATING A FLOW BACK FLUID EXITING A WELL SITE
Abstract:
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.