The current method of heavy oil thermal recovery in oil fields is to provide thermal energy to the oil layer, increase the temperature of the rocks and fluids of the oil layer, thereby increasing the oil displacement power of the oil reservoir and increasing the oil production. Existing problems: 1. The mining is difficult and the cost is high. 2. The high temperature steam is demanding on the production equipment. 3. The regular gas injection, multiple operations and high production costs. 4. The traditional method of raising pipe string gas injection, resulting in heat loss , The all-metal screw pump can solve the problem of heavy oil thermal recovery:

Metal stator: The spiral wire of the metal stator adopts 1-6m integrated processing and molding, alloy steel material, the surface is treated with low temperature nitriding, and the hardness reaches 950-1000HV.

Metal rotor: The spiral wire of the metal rotor adopts one-time forming machining, alloy steel material, the surface is treated with low temperature nitriding, and the hardness reaches 650-750HV

Design level: V2 Performance level: F1 Quality level: Q3

Performance indicators: temperature resistance of 370℃, life span of 3-5 years, volumetric efficiency above 65%, integration of injection and production can be realized for thermal recovery conditions.