Polymer Injection Block Oilfield Reinjection Water Treatment
Process Overview
PROCESS INTRODUCTION
The produced water from polymer flooding blocks contains high concentrations of polymers, characterized by high polymer content, high viscosity, high oil content, and strong emulsion stability. The traditional "three-stage + flotation" treatment process has poor treatment effects on polymer-containing wastewater, and generates large amounts of oily sludge, failing to meet the water quality requirements for reinjection.
Targeting the characteristics of polymer-containing wastewater, Sinokle has developed a new treatment process with CDOF catalytic oxidation viscosity reduction as the core. The CDOF unit uses patented oxidation technology to rapidly break and degrade macromolecular polymers in the water, significantly reducing wastewater viscosity while solving the persistent problem of filter media hardening caused by high-molecular-weight polymers in downstream filters. The CDFU unit utilizes micro-bubble synergistic cyclone flotation to precisely break emulsions and rapidly remove floating oil, emulsified oil and suspended solids from the water. After fine filtration, the produced water directly enters the reinjection water buffer tank for compliant reinjection. The crude oil collected by CDOF and CDFU is uniformly directed to the crude oil tank for recovery and reuse.
Process route: Polymer-containing wastewater → Coarse filter → CDOF catalytic oxidation viscosity reduction → CDFU cyclone dissolved air flotation → Fine filter → Reinjection water buffer tank → Reinjection
| Testing Parameter | Influent (Polymer-Containing Wastewater) | Effluent (Reinjection Water Standard) |
|---|---|---|
| Oil Content | Up to hundreds to thousands of mg/L, stable emulsification | ≤10ppm (mg/L) |
| Polymer Content | High concentration polymer, high viscosity, prone to filter media hardening | ≤50ppm (mg/L) |
Polymer Flooding Block Polymer-Containing Wastewater Treatment Process Flow Diagram
Technical Advantages
TECHNICAL ADVANTAGES
Patented catalytic oxidation technology rapidly breaks and degrades macromolecular polymers, significantly reducing wastewater viscosity, fundamentally lowering downstream treatment difficulty, and thoroughly solving the filter media hardening problem.
CDFU cyclone dissolved air flotation adopts pure physical demulsification, eliminating the need for cationic deoiling agents and other chemicals, avoiding secondary pollution, and ensuring stable and compliant effluent quality.
Pure physical process generates no oily sludge. Oil collected by CDOF and CDFU is directly returned to the crude oil tank, enabling effective crude oil recovery, enhancing oil recovery rate, and eliminating hazardous/solid waste disposal burden.
Stable process operation with strong impact resistance, capable of withstanding 10%~150% water volume and quality fluctuations, adapting to the complex and variable wastewater composition during polymer flooding operations.
Fully automated and informatized operation, supporting remote monitoring and early warning, significantly reducing on-site labor costs, adapting to the trend of reduced-personnel and unmanned management at oilfield sites.
Core equipment skid-mounted integration, small footprint, significantly reduced civil construction investment, pressurized enclosed operation, safe and eco-friendly, low O&M costs, rapid relocation and redeployment capability.
Technical Comparison
TECHNICAL COMPARISON
| Comparison Item | Traditional Three-Stage + Flotation Process | Sinokle CDOF + CDFU Process |
|---|---|---|
| Viscosity Reduction | No dedicated viscosity reduction method, macromolecular polymer residue, high viscosity, downstream filter media extremely prone to hardening and blockage | CDOF patented catalytic oxidation, macromolecular polymers rapidly break and degrade, thoroughly solving filter media hardening problem |
| Oil Removal Effect | Polymer-containing wastewater has stable emulsification, traditional flotation has low oil removal efficiency, effluent oil content difficult to meet reinjection standards | CDFU micro-bubble cyclone flotation synergistic demulsification, effluent oil content ≤10ppm, stably meeting reinjection requirements |
| Chemical Dosage | Requires large amounts of cationic deoiling agents, coagulants and other chemicals, high operating cost, secondary pollution risk | Pure physical process, zero chemical dosage throughout, no secondary pollution, significantly reduced operating cost |
| Sludge Generation | Generates large amounts of oily sludge, requires additional sludge treatment system, high hazardous waste disposal cost | No oily sludge generated, collected crude oil directly reused, reducing hazardous waste, eliminating solid waste disposal burden |
| Operational Stability | Polymer-containing wastewater has large composition fluctuations, traditional process has poor adaptability, unstable effluent quality, easily exceeds standards | Can withstand 10%~150% water volume and quality fluctuations, long-term stable operation, strong impact resistance |
| Footprint and O&M | Scattered equipment, large footprint, requires dedicated personnel on duty, high labor cost, complex O&M | Core equipment skid-mounted integration, small footprint, fully automatic remote monitoring, reduced-personnel O&M, low comprehensive cost |
