Anti-theft wellhead assembly

Abstract

The invention discloses an anti-theft wellhead assembly, comprising a casing pipe flange, a wellhead four-way piece, and an anti-theft cover, wherein the casing pipe flange is connected with a wellhead casing pipe, and an oil pipe is arranged inside the wellhead casing pipe; a center hole and an annulus are arranged inside the wellhead four-way piece, the center hole is communicated with the oil pipe, the annulus is circumferentially arranged outside the center hole, a four-way flange is arranged at the bottom of the wellhead four-way piece, the four-way flange and the casing pipe flange are arranged up and down and are connected by means of an anti-theft connecting assembly, a monitoring control piece and a circular interface are connected to the wellhead four-way piece, the circular interface is communicated with the annulus, and the upper end of the wellhead four-way piece is provided with a ball valve at a position corresponding to the center hole; and the anti-theft cover covers on the outer part of the wellhead four-way piece, an anti-theft bolt and a limiting control piece capable of controlling the anti-theft cover to be separated from the wellhead four-way piece are arranged between the side wall of the anti-theft cover and the four-way flange, and the anti-theft bolt and the limiting control piece are mutually spaced in the circumferential direction of the anti-theft cover.

Description

technical field [0001] The invention relates to well sealing technology equipment, in particular to an anti-theft wellhead device used for surface wellhead sealing control after abandoned well sealing treatment. Background technique [0002] At present, along with the process of oilfield development, a certain number of abandoned wells need to be plugged every year. In addition, due to the construction of the gas storage, the old wells of the gas storage also need to be plugged. Whether it is plugging of abandoned wells or plugging of old wells, a wellhead device that is convenient for monitoring and can prevent theft is needed after plugging. [0003] Although conventional wellhead devices are fully functional, they are not anti-theft and are easily damaged. Afterwards, anti-theft wellhead devices appeared. Existing anti-theft wellhead devices have disadvantages, such as not being able to kill the well in circulation, not being able to monitor the pressure in the tubing a...

AI Technical Summary

Problems solved by technology

[0003] Although the conventional wellhead device has full functions, it is not anti-theft and easy to be damaged

After that, anti-theft wellhead devices appeared. The existing anti-theft wellhead devices have disadvantages, such as not being able to kill the well in circulation, not being able to monitor the pressure in the tubing and the annulus at the same time, and being easily damaged (such as the pressure gauge is easy to be smashed directly)

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