A protection device for preventing sticking of a rotary drilling rig

Abstract

The invention discloses a protection device for preventing drill sticking of a rotary drilling rig. The main structure is a drill protection cover with a cylindrical structure, and a drill rod installation hole is opened at the top center of the drill protection cover for installing the drill rod; There are 3 drill installation operation holes and 1 drill control rod hole on the outside of the rod installation hole. The drill installation operation holes are set in three directions orthogonal to the top of the drill protection cover, which are used as drill installation process holes and drill control rod holes. to install the drill control rod; the side of the drill bit protection cover is provided with drill bit installation pin holes for installing the drill bit installation pin; the inside of the drill bit protection cover is provided with 4 buckle baffles, which are used to prevent the rotation between the rotary drilling bit and the protection device. relative rotation occurs. The invention is simple to manufacture, flexible and convenient to install, can be assembled together with the drill bit, has few restrictions, and can effectively prevent the jamming caused by the instability of the hole wall, the falling of the rock or the blocking of the top device of the drill bit by a large boulder protruding from the hole wall drill accident.

Description

technical field [0001] The invention relates to the technical field of rotary drilling rigs, in particular to a protection device for preventing drill sticking of rotary drilling rigs. Background technique [0002] The construction site of this project is located in the reclamation area, and the geological conditions are complex. From top to bottom, they are rock filling layer, plain filling layer, silt, silty clay, silty clay, gravel sand, gravel clay, fully weathered rock, Strongly weathered rock and moderately weathered rock, the rock filling is moderately weathered and slightly weathered granite with a diameter of 200mm~2000mm. During the construction of the engineering pile foundation, the rocks on the hole wall of the rockfill layer are extremely unstable, and often fall to the top of the drill bit of the rotary drilling rig, causing drill sticking accidents, damage to the drill bit and drill pipe in the slightest, and inability to pull out the drill pipe in severe cas...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the technical defect of the engineering pile foundation construction process in the prior art, because the rocks on the hole wall of the rock filling layer are extremely unstable and fall to the top of the drill bit of the rotary drilling rig, which is easy to cause the drill to be stuck, the present invention provides a method for preventing rotary excavation. The protection device for drilling rig jamming is assembled with the drill bit when in use, realizing the purpose of isolating the drill bit from the rockfall on the hole wall, effectively avoiding the damage of the drill bit caused by the rockfall stuck to the drill bit, and solving the above technical problems

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