A hexagonal plug-in outer groove high-pressure compact drill pipe

Abstract

The invention discloses a hexagonal plug-in type external groove high-pressure compact drill pipe, which comprises a male joint, a drill pipe body and a female joint connected in sequence, and a connecting pin for connecting the male joint and the female joint. The drill pipe The body has a hexagonal structure, and the male joint and the female joint are radially provided with connection holes. When the male joint and the female joint are connected, the corresponding connection holes of the male joint and the corresponding connection holes of the female joint are formed radially opposite to each other for connecting pins. Passes radially through the pin hole that connects the pin and box. The wall of the drill pipe of the present invention adopts a hexagonal body design, and the drill pipe realizes a plug-in high-pressure resistant seal. The wall of the hexagonal drill pipe body can not only keep the drill clamping and prevent sliding during the drilling process, but also improve the drill pipe’s resistance to drilling. The mixing and crushing ability of coal cinder prevents faults such as hole plugging, drill sticking, and drill sticking, and ensures the safe construction of coal mine gas drainage drilling.

Description

technical field [0001] The invention relates to the technical field of gas drainage in coal mines, in particular to a hexagonal plug-in high-pressure dense drill pipe with outer grooves. Background technique [0002] Coal resources occupy a fundamental and dominant position in my country's energy structure, and its coal production and consumption rank among the top in the world. my country's coal resources are widely distributed and have complex geological conditions, among which high-gas outburst mines account for a large proportion. Most coal seams have the characteristics of "three highs and one low", and coal seam gas has become one of the main factors restricting the recovery of coal resources. Borehole gas drainage is the main measure and technology for coal seam gas control in my country's coal mines, especially the pre-extraction of long boreholes in the pre-mined coal seam construction is the main method to reduce the gas content and gas pressure during coal seam r...

AI Technical Summary

Problems solved by technology

The smooth and slagging ability of the three-edged drill pipe body is limited, and hole plugging is easy to occur

The circular helical drill pipe has a small thread depth, which has low destructive ability to coal slag in the hole and limited transmission capacity, especially in holes with poor slag discharge, which is prone to drill sticking

In addition, due to the circular structure of the drill pipe body, the drilling clamp is prone to slippage, which increases the difficulty of troubleshooting and increases the risk of drill drop

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