Intelligent wellhead sealing device

Abstract

The invention discloses an intelligent wellhead sealing device. The device comprises a floating double-sealing device and a set of hydraulic energy storage and reinforcement system capable of compensating pressure; the floating double-sealing device comprises a shell and an annular sealing sleeve; a 360-degree sliding groove is formed in the top end of the shell; an annular sealing sleeve is fixedly installed in an inner cavity of the shell through a first supporting ring and a second supporting ring; the annular sealing sleeve is composed of a straight cylinder connecting sleeve and at leastone annular high-pressure sealing cavity; a floating packing box capable of horizontally floating in a sliding groove in the top end of the shell is installed at the upper end of the straight cylinderconnecting sleeve on the upper portion of the annular sealing sleeve; packing is installed in the floating packing box; an elastic pressing plate and a packing locking cap are installed on the packing; a polished rod of an oil pumping unit is installed in the annular sealing sleeve; the upper end of the polished rod of the oil pumping unit sequentially penetrates through the floating packing box,the packing, the elastic pressing plate and the packing locking cap; and the lower portion of the shell is connected with the hydraulic energy storage reinforcement system communicating with the high-pressure sealing cavity. An eccentric wear problem generated in 90% or more of oil wells is solved, and the service life of the oil pumping unit is prolonged.

Description

technical field [0001] The invention relates to an oil pumping wellhead device, in particular to an intelligent wellhead sealing device. Background technique [0002] The beam pumping unit is a kind of pumping equipment widely used in low-production oil wells in the world. It uses the pumping unit to drive the piston connected to the sucker rod in the pipe string to reciprocate, so as to lift the pump barrel and the crude oil at the bottom of the well to the ground. Due to the relative movement between the sucker rod and the oil pipe, the wellhead of this type of equipment is equipped with a packing box to prevent oil leakage. At present, there are four major problems in the use of traditional packing boxes: 1. It is impossible to self-adaptively adjust the eccentric wear caused by assembly / pumping unit foundation tilt / polished rod due to corrosion and mechanical damage. The existing deviation adjustment measures all need manual intervention. 2. With the extensive use of ...

AI Technical Summary

Problems solved by technology

At present, there are four major problems in the use of traditional packing boxes: 1. Unable to self-adaptively adjust the eccentric wear caused by assembly / pumping unit foundation tilt / polished rod due to corrosion and mechanical damage, etc.

3. Ordinary packing boxes need to release the pressure when replacing the packing, which not only takes a long time to stop, affects the output, but also pollutes the environment, causing environmental problems

4. The current wellhead packing sealing device does not have an economical and applicable intelligent equipment that can automatically close the wellhead according to the pressure and leakage

Or the hydraulic system is complicated, the cost is high, and the pipeline is long and the response is slow

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