A rotary dynamic sealing device for a core lifting mechanism

Abstract

The invention discloses a rotary dynamic sealing device of a core lifting mechanism, which comprises a cabin seat, a first cabin head is arranged on the upper end of the cabin seat, a second cabin head is arranged on the upper end of the first cabin head, the first cabin head and the second cabin head are arranged The first shaft cavity and the second shaft cavity are respectively provided on the head of the second cabin; the pulse dissipation pool is provided on the cabin seat, the lower end of the first shaft cavity communicates with the pulse dissipation pool, the first shaft cavity and the second shaft cavity There is a mandrel lifting shaft; the first liquid supply port is opened on the pulse dissipation pool, the second liquid supply port and the third liquid supply port are respectively provided in the middle of the first shaft cavity and the second shaft cavity; the mandrel lifting shaft and the first shaft The cavity is connected through the first sealing mechanism, and the mandrel is connected with the second shaft cavity through the second sealing mechanism. This solution is used in the hydraulic reciprocating and low-speed rotary motion sealed core lifting mechanism, especially suitable for mud, crude oil and other harsh working conditions containing granular media, to ensure the sealing of the core lifting mechanism.

Description

technical field [0001] The invention relates to the technical field of drilling, in particular to a rotary dynamic sealing device of a core lifting mechanism. Background technique [0002] The in-situ rock mechanical behavior of different depths of rock formations is the leading science and important theoretical basis for deep drilling, deep resource development and utilization, and earth application science. The core and key is how to obtain "in-situ cores" under deep environmental conditions. ", and real-time loading test and analysis were carried out under the in-situ fidelity state. [0003] However, due to the complex occurrence conditions in the deep part and the environment of high temperature and high pressure, in order to obtain the "in-situ core", the driving core lifting mechanism must keep the cabin airtight under high temperature and high pressure during the rotation operation process, and at the same time prevent The internal fluid leaks, but the existing seal...

AI Technical Summary

Problems solved by technology

[0005] 1) The problem of effective contact between the high-speed rotating shaft and the seal;

[0006] 2) The safety and reliability of single-stage rotary dynamic seal

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