An all metal high temperature resistant screw pump

Abstract

The invention discloses a full-metal high-temperature-resistant screw pump, which comprises a metal stator and a metal rotor, wherein the inner surface of the metal stator is in clearance fit with the outer surface of the metal rotor. The full-metal high-temperature-resistant screw pump is characterized in that the metal stator comprises a stator metal matrix and a first hard material seepage layer arranged on the inner surface of the stator metal matrix; the metal rotor comprises a rotor metal matrix and a second hard material seepage layer arranged on the outer surface of the rotor metal matrix; the hardness of the first hard material seepage layer is different from that of the second hard material seepage layer; and a Hartz hardness difference between the first hard material seepage layer and the second hard material seepage layer is HV200 to HV5,000. The full-metal high-temperature-resistant screw pump has the advantages that the first hard material seepage layer and the second hard material seepage layer which have different hardness are arranged on the inner surface of the stator and the outer surface of the rotor; effects of corrosion resistance and high tempeture resistance during actual use of the full-metal screw pump are enhanced; and the shortcoming of short service life of the full-metal high-temperature-resistant screw pump is effectively solved.

Description

technical field [0001] The invention relates to a screw pump, in particular to an all-metal high temperature resistant screw pump. Background technique [0002] As a new technology with great potential and advantages in downhole mining technology, screw pump has been more and more widely used in various oil fields in the world in recent years. It has the characteristics of small initial investment, simple structure of ground driving device, convenient installation, small footprint and high pump efficiency. At present, the application of screw pumps is mainly concentrated in several major fields such as heavy oil cooling pumps, sand production reservoirs, offshore platforms, energy conservation and environmental protection. The traditional screw pump stator is made of nitrile rubber lining in the steel sleeve. But this kind of rubber stator screw pump usually can only cope with the normal work of low speed, low viscosity and low temperature. As the speed increases, the fri...

AI Technical Summary

Problems solved by technology

However, although the existing all-metal screw pump has the effect of corrosion resistance and high temperature resistance in theory, it is found in the actual use process that the working life of the all-metal screw pump with this structure is very short, only 90 days at most. Leakage will occur, resulting in the all-metal screw pump can not really be used in the actual production process

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