Hoisting constant pressure drilling system of top drive drilling rig and its working method

Abstract

The invention relates to the technical field of geological drilling projects, in particular to a constant-pressure drilling system of a top drive drill winch and a working method thereof. The constant-pressure drilling system of the top drive drill winch comprises a hydraulic pump station, wherein the hydraulic pump station comprises a hydraulic pump, a manual reversing valve and a drill winch driven by a winch motor, a hydraulic oil circulating loop is formed by the winch motor, the hydraulic pump and the manual reversing valve through a hydraulic pipeline, and the manual reversing valve is used for adjusting an operating direction of hydraulic oil in the winch motor; a branch connected to the winch motor in parallel is arranged on the hydraulic pipeline, and an electromagnetic stop valve and a proportional overflow valve, which are connected in series, are arranged on the branch. According to the invention, through controlling drilling force during construction of a drill, the drill has constant feed force when the drill works, and the feed speed is automatically adjusted along with drilling complexity. When a soft stratum is drilled, quick drilling can be realized, and the drilling efficiency is not influenced; when a hard stratum is drilled, the speed is automatically reduced, so that the pressure of the drill on the stratum is not overlarge to destroy a drill bit quickly.

Description

technical field [0001] The invention relates to the technical field of geological drilling engineering, in particular to a hoisting constant pressure drilling system for a top drive drilling rig and a working method thereof. Background technique [0002] At present, the core drilling used in the field of geological drilling engineering is one of the main means of geological and mineral exploration. Due to the complex geological structure and many hard rock formations, the hardness of the drill bit is very high. Therefore, diamond drill bits are widely used in core drilling. The drill bit It has the advantages of high efficiency and long life. In actual operation, in order to make the diamond drill bit high in efficiency and long in life, it is necessary to control the pressure of the drill bit on the rock within a certain range. However, the feeding speed of the old model in the past depends on Guaranteed by the experience of the operator, it is very likely that the feed spe...

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Problems solved by technology

[0002] At present, the core drilling used in the field of geological drilling engineering is one of the main means of geological and mineral exploration. Due to the complex geological structure and many hard rock formations, the hardness of the drill bit is very high. Therefore, diamond drill bits are widely used in core drilling. The drill bit It has the advantages of high efficiency and long life. In actual operation, in order to make the diamond drill bit high in efficiency and long in life, it is necessary to control the pressure of the drill bit on the rock within a certain range. However, the feeding speed of the old model in the past depends on Guaranteed by the experience of the operator, it is very likely that the feed speed is too slow when drilling soft formations, and the efficiency is low; when drilling hard formations, the speed is too fast, and the pressure of the drill bit on the ground is too high, resulting in rapid damage to the drill bit

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