Combined fishing tool and fishing method for inclined chopping bit in deepwater karst environment

Abstract

The invention discloses a combined fishing tool and fishing method for an inclined chopping bit in a deepwater karst environment. The combined fishing tool is composed of a hollow hammer and a drill bit grabbing bucket. The fishing method comprises the steps that a percussion drill is firstly used for impacting on the fallen chopping bit, the inclined chopping bit is corrected, and karst hard rockclamping the edge of the chopping bit is crushed; then the drill bit grabbing bucket is mounted and tripped in, a jaw plate of the drill bit grabbing bucket is expanded due to the gravity of itself,the top of the chopping bit is embedded and extruded into the drill bit grabbing bucket, a steel wire rope of the percussion drill is lifted up at this moment, the jaw plate bears force to be closed and is embedded into a steel wire rope hole in the top of the chopping bit, and therefore the chopping bit is grabbed and fished out of the hole. According to the combined fishing tool and fishing method, two kinds of tools coordinate with each other and work at the same time, the fishing efficiency is high, treatment time can be effectively saved, and certain economic benefits are achieved. When the inclined chopping bit is fished in the deepwater karst environment, underwater operation and blasting operation do not need to be carried out by a diver, and safety accidents can be effectively avoided.

Description

technical field [0001] The invention relates to a drill bit fishing tool for a drilling rig, in particular to a combined fishing tool and method for an inclined percussion drill bit in a deep-water karst environment. Background technique [0002] Pile foundation engineering in karst geological environment usually adopts percussion drill for drilling construction. When percussion drill impacts into the karst cave, drill bit sticking or drill drop accidents are prone to occur. The traditional percussion drill bit salvage method is to use diver's diving salvage method or underwater blasting method, but the safety risk of diving salvage method and underwater blasting method is extremely high in complex karst geological environment, and the operating depth of diver's diving and underwater blasting is not suitable More than 60m, it is not applicable when the drill bit is deep; or use a crane to hang the special sling and hook into the pile hole and try repeatedly to hook the percu...

AI Technical Summary

Problems solved by technology

[0002] Pile foundation engineering in karst geological environment usually adopts percussion drill for drilling construction. When percussion drill impacts into karst cave, it is easy to cause drill bit sticking or drill drop accidents.

The traditional percussion drill bit salvage method is to use diver's diving salvage method or underwater blasting method, but the safety risk of diving salvage method and underwater blasting method is extremely high in complex karst geological environment, and the operating depth of diver's diving and underwater blasting is not suitable More than 60m, it is not applicable when the drill bit is deep; or use a crane to hang the special sling and hook into the pile hole and try repeatedly to hook the percussion drill bit, and then take out the percussion drill bit. The efficiency of this method is extremely low. When the pile hole is deep and the impact drill bit is tilted, it is difficult to catch the dropped impact drill bit. It is necessary to keep trying repeatedly, which will easily delay the construction period.

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