Embedded sealing unit

Abstract

The invention provides an embedded sealing unit, and belongs to the field of well fixing devices. The embedded sealing unit comprises a sealing assembly and an expansion sealing assembly. The sealing assembly is arranged in a sealing sleeve. The expansion sealing assembly comprises a central pipe. One end of the central pipe is connected with a sleeve accessory through an internal thread. The other end of the central pipe is provided with a positioning notch groove. The expansion sealing assembly is fixed to the horizontal plane and can drive the sealing assembly for sealing. The defects in the prior art are overcome; the high cost for machining a special threaded sleeve accessory when a well is fixed through a special threaded sleeve is reduced; meanwhile, for reliably fixing the sleeve accessory in the sleeve, the embedded sealing unit is used in cooperation with the sleeve accessory, the functions of a conventional sleeve accessory can be provided, and the embedded sleeve accessory can be installed on a construction site; the embedded sealing unit is reasonable in structure, low in price, convenient to operate, reliable in function and capable of being applied to various threaded sleeves.

Description

technical field [0001] The invention belongs to the field of cementing engineering equipment, in particular to an embedded sealing unit. Background technique [0002] Cementing is the last link of drilling engineering. Casing accessories (floating hoops, floating shoes, ball seats, etc.) have a direct impact on the quality and economic benefits of drilling engineering. At present, the casings used in deep wells, ultra-deep wells, gas storage wells, and offshore oil fields contain more and more special threads, and the requirements for the connection and sealing between casings are getting higher and higher. Processing the corresponding casing thread, due to the small number of processing manufacturers and high processing difficulty, the resulting cost is very high and the quality of thread processing is not easy to guarantee, which increases the risk of loss of sealing of the casing string. [0003] In order to solve the above problems, an embedded casing accessory has been...

AI Technical Summary

Problems solved by technology

If the rated pump pressure is high, it is necessary to increase the volume of the hydraulic pump, etc., causing problems such as portability and inconvenient operation; if the rated pump pressure is low, there will be problems such as unstable setting of the sealing unit

[0005] A friction-type built-in floating collar for oil and gas wells (authorized publication number: CN201738874). The floating collar relies on tightening the ball basket thread to spread the slips and fix it on the inner wall of the casing. However, the floating collar can only withstand reverse pressure. Unable to withstand positive rubber plug bump pressure, thus limiting its limited range of use

There is also a built-in casing floating collar (authorized publication number: 202176310), which has four sets of slips, but the rectangular teeth processed on the outer surface of the slips are not conducive to the setting of the sealing unit

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