Drill bit of rotary drilling rig

Abstract

The invention discloses a drill bit of a rotary drilling rig. The drill bit comprises a drill bit main body, wherein the drill bit main body is in a split type, and comprises a drill bit upper part and a barrel, the bottom end face of the drill bit upper part is welded with a lower plate, the upper end of the drill bit upper part is provided with a drilling rod connecting device, the upper end face of the barrel is welded with an upper plate, the drill bit upper part and the barrel are fixedly connected together by the lower plate and the upper plate, the lower plate and the upper plate are connected together to form a connecting plate group, and the connecting plate group is of a tool jamming protecting structure. The drill bit is in the split type and is divided into the drill bit upper part and the barrel which are connected together by the connecting plate group, the fixing force of the connecting plate group is smaller than the tensile strength of a drilling rod, when tool jamming occurs, the drilling rod is lifted by external force which is far greater than the lifting force of a winch, the drill bit can be separated from the connecting plate group part, the separating part is precise, the breakage of the middle part of the drilling rod is not caused, and personnel do not need to descend for operation.

Description

technical field [0001] The invention relates to a drill bit of a rotary drilling rig, which belongs to the technical field of drilling rig components. Background technique [0002] Rotary drilling rigs often encounter drill stuck accidents during the drilling process. The current drill bit does not have a stuck drill protection mechanism. When dealing with accidents, there are generally two methods: 1. The diver dives into the mud to pull out the drill pipe and The connecting pin shaft of the drill bit is more dangerous and personal safety cannot be guaranteed, and when the diameter of the drill hole is small, it is difficult for the diver to go down to the bottom of the hole; 2. Use external force to lift, because the fracture position is uncertain, and it may cause The middle part of the drill pipe was broken and the loss was large. The above two processing methods have long processing time and huge economic losses, and improper processing will cause other accidents, such...

AI Technical Summary

Problems solved by technology

[0002] Rotary drilling rigs often encounter drill stuck accidents during the drilling process. The current drill bit does not have a stuck drill protection mechanism. When dealing with accidents, there are generally two methods: 1. The diver dives into the mud to pull out the drill pipe and The connecting pin shaft of the drill bit is more dangerous and personal safety cannot be guaranteed, and when the diameter of the drill hole is small, it is difficult for the diver to go down to the bottom of the hole; 2. Use external force to lift, because the fracture position is uncertain, and it may cause The middle part of the drill pipe is broken and the loss is large

The above two treatment methods take a long time to deal with and cause huge economic losses. Improper treatment will cause other accidents, such as large-scale landslides and vehicle rollovers, resulting in more serious consequences.

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