Compared with conventional pumping units, the screw pump has a small footprint and is energy-saving and environmentally friendly. The stator outer tube of the equal-wall stator screw pump has a double-helical curve shape, and the consumable parts—thickness and unevenness of the rubber bushing—are designed as even-thickness rubber bushes. This kind of design structure makes the equal-wall-thickness stator screw pump have great difference in processing technology, design parameters and work performance compared with the conventional screw pump, but the pump efficiency is improved a lot.

The project team of the Oil Recovery Engineering Research Institute began its research at the beginning of this year. In order to solve the difficult problems such as the complex molding process of isopipe stator outer pipe and the difficult control of process parameters, the project team members have continuously tested and optimized the processing parameters and control technology to ensure the machining quality of the stator outer pipe. In order to reduce the thickness of the stator rubber layer with equal thickness, the rubber injection channel becomes narrower, the fluidity of the rubber becomes worse, and the rubber filling chamber is difficult to fill. The multi-point injection rubber process is used to reduce the rubber flow resistance and the flow distance. The glue process always maintains a certain glue injection temperature and improves the fluidity of the rubber. For the equal thickness of the outer wall of the stator, the inner cavity of the stator is a double helix curved surface, and the sandblasting and coating adhesive process using the conventional screw pump easily lead to uneven sand blasting force and adhesive thickness and affect the bonding strength. The angled nozzles at a certain angle ensure that the nozzles and the stator are always perpendicular to the sandblasted surface, ensuring the sandblasting effect.

In more than half a year of field tests, members of the project team carried out constant-thickness stator screw pumps and conventional screw pumps with the same structural parameters and pump-interference, and performed 50, 100, and 150 degrees at 30, 50, and 70 degrees Celsius, respectively. Comparison of hydraulic characteristics at the time of transfer/minute. The test results show that the equal wall thickness stator screw pump has the following advantages compared with the conventional screw pump: good heat dissipation, improved working life of the screw pump, uniform rubber expansion, improved working stability of the pump, high single-stage pressure, Improve system efficiency.

Particularly worth mentioning is that, through testing and comparison, the two GLB500-14 and GLB800-14 wall-thickness screw pumps currently used in this institute are equal to the conventional 10 and 12 type pumping units. Up to now, under the same workload, the efficiency of the system has been greatly improved, while the consumption of 100 tons of liquid per ton has decreased slightly.