As global oil and gas exploration shifts toward "deep-earth" strategic frontiers, ultra-deep wells ranging from 6,000 to 9,000 meters—represented by the Tarim and Sichuan Basins—have become the primary battlefield for increasing reserves and production. Research from Petroleum Exploration in China indicates that formation pressures in ultra-deep layers generally exceed 50MPa, with extreme conditions reaching even higher magnitudes, posing rigorous challenges to the reliability of reservoir energy replenishment equipment. Greatall Chengen has independently developed the 70MPa Nitrogen Generation and Injection System, specifically engineered for high-pressure ultra-deep well operations to overcome these sub-surface challenges.
Technical Breakthrough: Reliability Under Extreme Pressure
● Extreme Pressure Ratings: The system achieves a maximum discharge pressure of 70MPa, representing the leading edge of domestic oilfield injection technology and meeting the demands of ultra-deep wells between 6,000 and 7,000 meters.
● High-Volume Output: Even at peak pressure, the system maintains a flow rate of up to 3,000 Nm³/h, ensuring a continuous supply of high-pressure nitrogen to effectively replenish formation energy.
● Core Configuration: Utilizing both PSA (Pressure Swing Adsorption) and membrane separation technologies, the system produces nitrogen with a stable purity of ≥95%. The core architecture features a series compression process combining a high-reliability screw compressor with a heavy-duty reciprocating piston booster, integrated with long-life Hoerbiger critical components to ensure stable, continuous operation under harsh field conditions.
Application Scenarios: End-to-End Solutions
● Enhanced Oil Recovery (EOR): In the late stages of oilfield development, high-pressure nitrogen is used for gas flooding or foam flooding. By leveraging the expansion properties of nitrogen, residual oil is displaced from rock pores, significantly improving the recovery factor.
● Wellbore Operations: The system is applied in nitrogen-assisted flow induction and gas lift to resolve fluid loading issues. It also provides high-pressure gas support for specialized operations such as acidification and hydraulic fracturing.
● Pipeline Maintenance: Used for pressure testing, purging, and displacement to ensure the safety and integrity of oil and gas transport pipelines.
Core Advantages
● Skid-Mounted Design with High Adaptability: The integrated skid-mounted or containerized design facilitates rapid transport and onsite deployment. Flexible drive options—including electric, diesel, and gas engines—allow the system to adapt to complex energy supply environments.
● Intelligent Control and Safety: Equipped with a comprehensive control system featuring dual mechanical and electronic protection. The air-cooled design is particularly suited for operations in water-scarce or extreme cold regions.
● Global Validation and Proven Experience: Over 200 units of Greatall Chengen’s nitrogen systems are currently in operation worldwide. Domestically, they serve major oilfields such as Daqing and Tarim; internationally, they have demonstrated long-term reliability in challenging environments across South Africa, Venezuela, and Russia.
As a hallmark of China’s high-end oil and gas equipment, the Greatall Chengen 70MPa Nitrogen Generation and Injection System leverages its high pressure, large displacement, and intelligent technology matrix to empower efficient deep-earth energy exploration globally.
