Control method, device and drilling rig for lowering speed of drill pipe of drilling rig

Abstract

The invention provides a control method and a device of drill rod lowering speed of a drilling machine and a drilling machine. The drilling machine comprises a power head and a drill rod, wherein the drill rod comprises a plurality of layers of embedded drill rod segments, the power head comprises a first drill rod load bearing surface, a first distance between the upper end part of the drill rod segment on the outermost layer and the first drill rod load bearing surface of the power head is measured during the lowering process, and the lowering speed is reduced if the first distance is smaller than a first preset distance. During the downward movement process of the drill rod, the lowering speed is reduced when the first distance between the upper end part of the drill rod segment on the outermost layer and the first drill rod load bearing surface of the power head is smaller than a preset length. Therefore, the drill rod can collide with the first drill rod load bearing surface at a small speed to realize the flexible contact of the drill rod and the power head so as to relieve the damage on the power head, avoid the fatigue deformation of the power head, prevent the damage rate of such components of the power head as speed reducer and motor and the like and improve the construction efficiency.

Description

technical field [0001] The present invention relates to the field of drilling rigs, and more specifically, to a method and device for controlling the lowering speed of a drilling rod of the drilling rig and the drilling rig. Background technique [0002] Drilling rigs (especially rotary drilling rigs) need to lower the drill pipe to the bottom of the drilling hole during the drilling operation (such as rotation-down drilling-drilling-lifting-drilling-rotation unloading). Wherein, the drill pipe includes drill pipe sections nested in multiple layers, and the multilayer drill pipe sections are arranged in the shape of an antenna, and can protrude to a corresponding length according to the depth of the drilled hole. [0003] During the lowering of the drill pipe, the power head is subject to the following two types of loads. First, when the outermost drill pipe section is first in contact with the first bearing surface of the power head of the drilling rig (for example, it may...

AI Technical Summary

Problems solved by technology

[0007] The present invention aims to provide a control method, device and drilling rig for the lowering speed of the drill pipe of the drilling rig, so as to solve the problem in the prior art that the power head is damaged due to impact when the drill pipe is lowered.

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