Dynamic produced water treatment apparatus and system

Abstract

An automated produced water treatment system that injects ozone or an ozone-oxygen mixture upstream of produced water separators, with the dose rate changing dynamically as the produced water quality changes, as determined by continuous monitoring of the produced water quality by a plurality of sensors that detect water quality parameters in real time. The system may operate as a “slipstream” injection system, that draws a portion of produced water from the produced water pipeline and injects ozone or an ozone-oxygen mixture back into the pipeline with disrupting or slowing normal operations. Disinfectants or other additives may also be injected.

What is claimed is: 
     
         1 . A fluid treatment system configured to treat a fluid stream, comprising:
 a fluid injection or disposal well;   one or more fluid treatment tanks, wherein the one or more fluid treatment tanks comprise at least one separator;   one or more downstream pipes connecting the one or more water treatment tanks with the fluid injection or disposal well;   upstream pipes in fluid connection with the one or more water treatment tanks;   an ozone injection system configured to inject ozone gas or an ozone-oxygen mixture gas into the fluid stream prior to the fluid reaching the fluid injection or disposal well; and   a nitrogen nano-bubble delivery system, configured to inject nitrogen or nitrogen-rich gas into the fluid stream.   
     
     
         2 . The system of  claim 1 , wherein the ozone injection system injects the ozone gas or ozone-oxygen mixture gas upstream of the one or more fluid treatment tanks. 
     
     
         3 . The system of  claim 1 , wherein the ozone injection system is a slipstream injection system configured to draw off a portion of the fluid stream for ozone gas or ozone-oxygen mixture gas injection. 
     
     
         4 . The system of  claim 1 , wherein the ozone injection system injects a dose rate of ozone gas or ozone-oxygen mixture gas that varies over time. 
     
     
         5 . The system of  claim 1 , wherein the nitrogen or nitrogen-rich gas is injected as nano-bubbles or micro-bubbles. 
     
     
         6 . The system of  claim 1 , wherein the ozone injection system produces oxygen-depleted reject gas in the process of producing oxygen and/or ozone, and said reject gas is directed to the at least one separator as blanket gas. 
     
     
         7 . The system of  claim 1 , wherein the ozone injection system is contained in whole or in part in one or more moveable containers or trailers. 
     
     
         8 . The system of  claim 1 , wherein the fluid stream is produced water from oil or gas wells, and/or fracturing fluid for a hydrocarbon fracturing operation. 
     
     
         9 . A fluid treatment system configured to treat a fluid stream, comprising:
 a fluid injection or disposal well;   one or more fluid treatment tanks, wherein the one or more fluid treatment tanks comprise at least one separator;   one or more downstream pipes connecting the one or more water treatment tanks with the fluid injection or disposal well;   upstream pipes in fluid connection with the one or more water treatment tanks;   an ozone injection system configured to inject ozone gas or an ozone-oxygen mixture gas into the fluid stream prior to the fluid reaching the fluid injection or disposal well; and   a nitrogen nano-bubble delivery system comprising a manifold with one or more strainers and a mixer, configured to inject nitrogen or nitrogen-rich gas into the fluid stream.