Membrane Nitrogen Injection System

Introduction of Mobile Nitrogen Generation System

To meet the requirements of nitrogen injection in new oilfield production processes, pipeline nitrogen purging, and other applications, our company has developed a system that combines a screw low-pressure air compressor, membrane nitrogen system, and high-pressure nitrogen boosting compressor system. This system can provide users with high-pressure nitrogen with a flow rate of 20Nm³/min and a pressure range of 15-35MPa.

The nitrogen generation system is designed in a skid-mounted form, with two separate skid blocks. The system is divided into three modules: the screw low-pressure air compressor module, the membrane nitrogen system module, and the high-pressure nitrogen boosting compressor module. The screw low-pressure air compressor module and the membrane nitrogen system module are installed on one skid block, while the high-pressure nitrogen boosting compressor system is on another skid block. The system is air-cooled and driven by a diesel engine, and the skid blocks are equipped with metal enclosures, making them easy to install on the chassis of vehicles, making it particularly suitable for field operations in oilfields.

The air in the atmosphere is first compressed to 1.4MPa by a diesel engine-driven air-cooled screw compressor. It is then dried by a refrigeration-type dryer and purified by a filter before entering the membrane nitrogen system. The 1.4MPa compressed air is subjected to membrane separation and diffusion, resulting in nitrogen at a pressure of 1.2MPa with a purity greater than 95%. This 1.2MPa nitrogen is further pressurized to 35MPa by an air-cooled piston compressor.

Components of the Mobile Nitrogen Generation Equipment System

The three main components of the mobile nitrogen generation equipment are as follows:

1. Air Compressor Unit: This includes an air compressor driven by a diesel engine or an electric motor, along with a local control system.

2. Membrane Separation Nitrogen Generation Device: This consists of an air purification system, a membrane separation nitrogen generation system, and a central control system.

3. Booster Unit: This includes a booster compressor driven by a diesel engine or an electric motor, along with a local control system.

4. Auxiliary Equipment: This may include a diesel generator, fuel tank, container/skid body (which can be a single-box, dual-box, or multiple-box configuration as needed), and other equipment required to support oil and gas production processes, such as foam metering pumps.

Applications of Mobile Nitrogen Generation Trucks

Three-Phase Production Operations:

1. Maintaining well pressure.

2. Nitrogen injection into oil wells in conjunction with hydrocarbons.

3. Gas lifting, increasing oil and gas production rates.

4. Gas lift operations to prevent downhole accidents.

5. Acidizing and fracturing for well stimulation and increased production.

6. Thermal recovery assistance and enhanced oil recovery (EOR).

7. Insulating wellbore in steam flooding.

8. Controlling mud density.

9. Cleaning wells.

10. Ideal carrier for surfactants.

11. Enhancing well production rates.

12. Extending the life of oil wells.

Pipeline Purging:

Pressure testing and purging of pipelines. The high-pressure membrane requires no additional booster unit, as it can directly generate nitrogen at 30bar or higher using a high-pressure air compressor. This is suitable for long-distance purging of large pipelines without the need for a booster.

Pipeline Nitrogen Filling:

Purging containers and pipelines containing flammable liquids and gases.

Replacement and maintenance of pipelines and containers.

Using nitrogen's inert properties as a gas seal to prevent the release of hazardous materials into the air.

Other Applications:

1. Coalbed methane recovery.

2. Natural gas gathering stations.

3. LNG receiving terminals.

4. Offshore drilling/production platforms.

5. Natural gas purification plants.