High-pressure-resistant drill rod and orifice sealing integrated device of drilling machine and implementation method

The multi-level dynamic sealing structure of wellhead support components, wellhead sealing components, and reinforced sealing components solves the problem of loosening and leakage of the orifice sealing device under ultra-high pressure jet operation, realizes the safety and stability of drilling operation, and improves the stability of supercritical CO2 gas injection.

CN121675795APending Publication Date: 2026-03-17SINOSTEEL MAANSHAN INST OF MINING RES CO LTD +1
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Patent Information

Application Number
CN202610061445.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-01-16
Publication Date
2026-03-17

AI Technical Summary

Technical Problem

Existing orifice sealing devices are prone to loosening in ultra-high pressure jet operations, leading to high-pressure gas leakage, which affects drilling efficiency and environmental safety.

Method used

A multi-level dynamic sealing structure is adopted, consisting of wellhead support components, wellhead sealing components, and reinforced sealing components, combined with mechanical pressurization and active adjustment mechanisms, to enhance the sealing performance between the drill pipe and the wellhead.

Benefits of technology

It achieves reliable sealing under ultra-high pressure and high temperature environments, preventing wellhead loosening and leakage, ensuring the safety and stability of drilling operations, and improving the stability of supercritical CO2 gas injection operations through the gas injection mechanism.

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Abstract

The invention discloses a high-pressure-resistant drill rod and orifice sealing integrated device of a drilling machine and an implementation method, and belongs to the technical field of drilling machine orifice sealing. Comprising a wellhead supporting assembly, a wellhead sealing assembly is arranged at the upper end of the wellhead supporting assembly, and a reinforced sealing assembly is arranged at the upper end of the wellhead sealing assembly; the well mouth sealing assembly comprises a well lid, a sealing ring, a first sealing sleeve, a drill rod, an annular base and a second sealing sleeve. Multi-level dynamic sealing guarantee is provided through the well mouth sealing assembly, ultrahigh-pressure and high-temperature environments can be reliably coped with, the high-temperature-resistant rubber sealing ring is adopted between the well lid and the lining cylinder, self-adaptive deformation can be achieved when pressure rises so as to enhance the sealing effect, the first sealing sleeve at the penetrating position of the drill rod achieves sliding sealing through the smooth wall face, and the sealing effect is good. The second sealing sleeve on the lower portion of the micro anchor rod is in interference fit with the drill rod, the sealing materials are prevented from displacing or falling off under extreme pressure by means of the micro anchor rod and a bonding dual-fixing mode, and continuous sealing of the drill rod in dynamic operation is guaranteed.
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