Dynamic Ozone Injection for Produced Water Treatment
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Solution Overview
Problem
Existing produced water treatment systems in oil and gas operations face inefficiencies due to constant dose rates of biocides and chemicals, which become ineffective as produced water quality changes, and struggle with effective separation and disposal of contaminants like hydrocarbons and suspended solids.
Innovation Solution
An automated treatment system dynamically injects ozone or ozone-oxygen mixtures upstream of separators, using continuous monitoring, and employs nano-bubble technology to introduce inert gases for improved separation and friction reduction, while utilizing reject gases as blanket gases and micro/nano-bubbles for enhanced treatment and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If constant dose rates of biocides and chemicals are used, then treatment process is simple, but treatment effectiveness decreases as produced water quality changes
Solution Approach 1:
The system transitions from constant dose rate injection to dynamic dose rate adjustment based on real-time water quality parameters. Sensors continuously monitor produced water quality and automatically adjust chemical injection rates, allowing the treatment system to adapt to changing water characteristics while maintaining effectiveness.
Solution Approach 2:
The system implements closed-loop feedback control where sensors detect water quality parameters (such as turbidity, pH, contaminant levels) and this information feeds back to the control system which adjusts chemical dosing accordingly. This ensures treatment effectiveness is maintained despite variations in produced water composition.
2Reliability
If ozone is injected at constant rate, then injection system is simple, but oxygen bubbles cannot provide optimal IGF effect when water quality changes
Solution Approach 1:
The ozone injection system dynamically adjusts oxygen bubble generation based on real-time monitoring of produced water quality. When water quality changes (such as increased oil content or contaminants), the system automatically modifies the ozone dosing rate to optimize the Induced Gas Flotation effect for current conditions, improving separation effectiveness.
3Object-affected harmful factors
If reject gas is vented to atmosphere, then system operation is simple, but safety hazards increase due to lack of explosion protection
Solution Approach 1:
The system captures reject gas (primarily nitrogen from ozone generation) and uses it to create an inert atmosphere in separation tanks and storage vessels. This nitrogen blanket displaces oxygen and prevents formation of explosive mixtures with hydrocarbons, significantly reducing fire and explosion hazards while maintaining operational safety.
4Stress or pressure
If produced water is disposed without friction reduction, then disposal process is simple, but pump pressure and energy consumption increase
Solution Approach 1:
The system uses the produced water itself as the medium for friction reduction by injecting microbubbles directly into the disposal stream. The dissolved gases in the produced water act as natural friction reducers, lowering viscosity and improving flow characteristics without requiring external additives or complex treatment systems.
Data Source
AI summary
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 without disrupting or slowing normal operations. Disinfectants or other additives may also be injected. The treatment system may be wholly or partially contained in mobile containers or trailers, for on-the-fly use in existing produced water treatment facilities. An oxygen de-gasser or de-aerator may be included, configured to remove gaseous oxygen from the fluid stream