Multi-slagging-hole large-sized-drill-bit-included combination type drilling tool system

Abstract

The invention relates to a multi-slagging-hole large-sized-drill-bit-included combination type drilling tool system comprising a drilling bit bracket (1). A cutter disc (2) is arranged at the bottom surface of the drilling bit bracket (1); and a plurality of cutters are installed at the cutter disc (2). A plurality of slagging holes (2.1) having long circle structures are formed in the cutter disc(2) and are staggered along the radial direction of the cutter disc (2). When the plurality of slagging holes (2.1) rotate with the cutter disc (2), the whole working face right below the cutter disc(2) is swept. With the multi-slagging-hole large-sized-drill-bit-included combination type drilling tool system, the slag is removed smoothly and conveniently; the drilling efficiency is high; and the service life is long.

Description

technical field [0001] The invention relates to a drilling tool system, in particular to an ultra-large drill bit with multiple slag outlets and a combined drilling tool system applied to offshore wind power foundation drilling construction, and belongs to the technical field of marine engineering construction equipment. Background technique [0002] At present, in the construction of offshore wind power single pile foundation, drilling operation is a very critical part; it needs to carry the drilling slag through the mud and discharge it in time during the downward drilling process, otherwise the drilling slag stuck at the bottom of the drilling hole The slag will hinder the drilling of the drill bit; in addition, the conventional drilling tool system also has the following deficiencies: [0003] 1. The high-pressure air used for gas lift reverse circulation is imported from the driving part of the drilling rig. Due to the constraints of the limited mechanical structure, it...

AI Technical Summary

Problems solved by technology

[0003] 1. The high-pressure air used for gas lift reverse circulation is imported from the driving part of the drilling rig. Due to the constraints of the limited mechanical structure, it is impossible to design a multi-air independent air supply pipe, so only one main pipe can be used to import high-pressure gas;

[0004] 2. The air duct installed in the double-wall drill pipe interlayer is welded and connected. Because it is a rigid connection, its fatigue resistance is poor. For the drilling tool system for offshore construction, the impact load caused by vibration, jumping and swinging is relatively high. Large, so the air pipe breaks due to fatigue damage at the welding connection with the drill pipe flange, resulting in air leakage, reducing the circulation flow of the mud, and affecting the service life of the drill pipe

[0005] 3. Conventional drill pipes use one air source and one pipeline

The structure of the pipeline is simple, but the resistance of the corresponding multiple suction ports is inconsistent, resulting in a large difference in absorption capacity, and the suction port with high resistance is prone to blockage, which affects the effect of pulp and slag discharge;

[0006] In order to solve the above problems, the company developed "a drilling tool system for offshore construction" with the application number 201711129148.5 in 2017. However, the above system still uses the traditional drill bit, and the traditional drill bit uses a slag outlet in actual use. It is found that there are problems of large tool wear and low rock breaking efficiency; because of the relationship between a slag discharge port, the distance for the mud to travel to the slag discharge port of the cutter head is longer, which increases the ineffective crushing of the drilling slag by the drill bit and causes the cutter Wear increases and life shortens; at the same time, conventional drill bits need to be replaced with different tools when facing different geological environments. For example, a hob is required for rock layers, and a scraper is required for clay layers. The geological structure can be judged by entering parameters, and the tool can be replaced in time, which seriously affects the construction efficiency

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