Project Overview
Oil extraction generates substantial volumes of produced water. Conventional treatment processes often yield unstable effluent quality, leading to formation plugging in oil reservoirs. The ceramic membrane injection water treatment system employs inorganic ceramic membrane cross-flow filtration technology for advanced purification of oilfield produced water. The treated effluent meets stringent oilfield reinjection standards and can be directly injected into subsurface formations, achieving resource recycling of produced water, minimizing wastewater discharge, and supporting green oilfield operations.
Feed Water Characteristics
Pre-treated oilfield produced water containing emulsified oil, suspended sediment, colloids, and high salinity, with significant fluctuations in water quality.
Treatment Performance
- Oil Content: ≤ 5 mg/L
- Suspended Solids (SS): ≤ 1 mg/L
- Median Particle Size: ≤ 1 μm
The effluent is suitable for direct reinjection into oil-bearing formations, effectively preventing pore throat plugging and protecting reservoir integrity.
Equipment Advantages
1. Exceptional Resistance to Harsh Operating Conditions Inorganic ceramic membranes exhibit outstanding resistance to high salinity, oil fouling, and temperature variations. Online cleaning with alkaline solutions and oxidants effectively removes oil deposits from the membrane surface. Anti-fouling performance far surpasses that of organic membranes, ensuring extended service life.
2. Stable and Reliable Effluent Quality The cross-flow filtration mode generates high-velocity shear across the membrane surface via tangential feed flow. Even under fluctuating influent conditions, effluent parameters remain consistently stable, eliminating risks of media breakthrough or exceedance of discharge limits.
3. Automated Operation with Simplified O&M The entire system is PLC-controlled with timed online backwashing and chemical cleaning cycles, enabling continuous unattended operation. Flux recovery after cleaning is excellent, with minimal long-term performance decay.
4. Streamlined Process with Minimal Sludge Production Eliminates the need for large doses of flocculants, drastically reducing sludge generation. The skid-mounted modular design minimizes footprint and on-site installation workload.
5. Resource Recycling & Sustainability All produced water undergoes advanced treatment and is fully reinjected into subsurface formations, conserving freshwater resources, eliminating external wastewater discharge, and meeting environmental compliance requirements for oilfield production.
Process Flow
Oilfield Produced Water Pretreatment → Feed Pump Transfer → Tubular Ceramic Membrane Cross-Flow Filtration → Qualified Effluent Reinjection into Formation
Applicable Scenarios
- Advanced treatment and reinjection of produced water at onshore oilfield central processing facilities
- Injection water preparation for low-permeability reservoirs
- Purification and reuse of produced water from heavy oil extraction operations
