High-pressure sealing driver of oil-extracting screw pump

Abstract

The invention discloses a high-pressure sealing driver of an oil-extracting screw pump, comprising a support, a reduction gearbox connected with a motor, a high-pressure double-end face mechanical seal and a mechanical seal auxiliary pressurizer, wherein the high-pressure double-end face mechanical seal is arranged between a speed reducer and the support, a pressure input pipeline is connected between the support and the mechanical seal auxiliary pressurizer, an input end valve and an input end pressure gauge are connected to the pressure input pipeline in series, and the pressure input pipeline is used for inputting pressure in a well to the mechanical seal auxiliary pressurizer; and a pressure output pipeline is connected between the mechanical seal auxiliary pressurizer and the high-pressure double-end face mechanical seal, and an output end valve and the output end pressure gauge are connected to the pressure output pipeline in series. The high-pressure sealing driver can be used for reliably sealing when a well mouth has high pressure or greatly fluctuates, can bear the high pressure of the well mouth as high as 15 MPa, and simultaneously and obviously improve the lubrication conditions of the end faces of a sealing ring of the mechanical seal.

Description

technical field [0001] The invention relates to a sealing driver of a screw pump, in particular to a high-pressure sealing driver of a screw pump for oil production. Background technique [0002] The mechanical seal used in the traditional screw pump ground drive device has limited pressure bearing capacity, and is easily damaged when the wellhead pressure is high or the well fluid pressure fluctuates violently, resulting in crude oil leakage and serious pollution of equipment and the environment. The mechanical seal used as a dynamic seal on the traditional screw pump driver is limited by the installation position and its own structure, and the lubrication effect is poor, which greatly affects the service life of the mechanical seal. [0003] The announcement number is CN2672325, and its announcement date is January 19, 2005. The Chinese utility model patent discloses a mechanical seal device in the reducer of a ground-driven single-screw pump. The static ring of the mechan...

AI Technical Summary

Problems solved by technology

Its shortcomings are: because the mechanical seal used is a common single-stage single-face mechanical seal, it cannot withstand the high pressure at the wellhead

Images