Short-Flow of Wellhead Produced Fluids Reinjection Treatment
Process Introduction
This process uses HAC for pretreatment and CDFU as the core equipment, combining filters with different filtration accuracies to meet various treatment requirements.
Option 1: After the extracted liquid undergoes pretreatment in a two-phase separator, the aqueous phase is discharged, and oil-containing wastewater enters two stages of HAC followed by two stages of CDFU for oil removal and removal of suspended solids. The polluted oil goes into an oil collection tank, waste gas is directed to a flare or natural gas pipeline, and the effluent enters two stages of active filter media filters. After meeting the standards for reinjection water, the water goes into a reinjection water tank. The backwash water for the filter is taken from the reinjection water tank. The effluent undergoes pressure filtration through sludge dewatering equipment, and the sludge cake is bagged and transported externally.
Option 2: Similar to Option 1, the extracted liquid undergoes pretreatment in a two-phase separator. The aqueous phase is discharged, and oil-containing wastewater enters two stages of HAC followed by two stages of CDFU for oil removal and removal of suspended solids. The polluted oil goes into an oil collection tank, waste gas is directed to a flare or natural gas pipeline, and the effluent enters a circulating water tank. Concentrated water from the circulating water tank enters CDFU, and the floating residue undergoes pressure filtration through sludge dewatering equipment. The sludge cake is bagged and transported externally, and the effluent from CDFU returns to the circulating water tank. The circulating water tank then goes through SIC membrane filtration, and after meeting the standards for reinjection water, the water is reinjected.
Process Characteristics
The process is concise, highly efficient, and exhibits strong shock resistance, ensuring stable effluent that meets water quality requirements.
It is free of chemicals, employing a pure physical demulsification separation technology without aged oil, avoiding secondary pollution, and providing excellent environmental benefits.
Utilizing a two-stage cyclone separator followed by two stages of cyclone dissolved air flotation for pretreatment ensures strong shock resistance, guaranteeing stable and reliable operation in subsequent processes.
Incorporating advanced filtration technology with high precision and excellent performance, the system exhibits strong shock resistance, long filter material lifespan, and ensures consistently meeting water quality standards.
Compact in design, occupying a small footprint, it is suitable for applications with high spatial requirements, such as offshore platforms.
Fully automated and informatized operation allows for remote monitoring, requiring minimal manual intervention, ensuring convenient and cost-effective maintenance.
Technical Comparison
NO. | Settling tank + centripetal air flotation + fiber ball/multi-media filtration + ultrafiltration membrane (conventional process) | Two-stage HAC+Two-stage CDFU+Filter+CDFU(SINOKLE) |
Process Effect | The water output can reach the A1 standard, but it is unstable for a long time. | The water output is stable and reaches A1 standard (5.1,1) |
Chemical | Pharmaceuticals such as PAC and PAM are in high demand | Pure physics, no chemical separation, environmentally friendly, only a small amount of PAC and PAM are required to produce mud at the end |
Adaptability | Not resistant to high temperatures, the membrane has poor adaptability to crude oil, poor adaptability to water quality fluctuations and impact resistance, serious membrane blocking, and poor system stability. | Adaptable to different crude oil qualities, resistant to high temperatures, strong impact resistance, and the system can operate stably |
Land area | Large tank settlement and traditional filters occupy a large area and are difficult to transport and install. | Efficient and fast processing equipment, compact equipment, small footprint, skid-mounted design, convenient transportation and installation |
Operating costs | High salt will cause difficulties in operation and maintenance, large amounts of chemicals will be used, resulting in large amounts of sludge, and high operating costs. | Less sludge, long membrane life, and low operating costs |
Commissioning period and floor area | The settlement of large tanks requires a large area, long construction and installation cycles, and many factors affecting construction (weather, labor, etc.) | Skid-mounted equipment, small footprint, short construction, installation and debugging cycle (skid-mounted design, factory pre-assembly and debugging) |
Process Index
Project | Technical Requirment | |
Oil content(mg/L) | SS(mg/L) | |
Option 1 (A2 standard) | ≤6 | ≤2 |
Option 2 (A1 standard) | ≤5 | ≤1 |
Application Case
