Fishing cup for large-size fallen object

Abstract

The invention discloses a fishing cup for a large-size fallen object. The fishing cup for the large-size fallen object is characterized in that an inclined spray nozzle is formed in a water hole portion of a lower cup rod of a cup body, and a fan-shaped cup opening and a cup horseshoe-shaped opening are formed in the cup body; the fishing cup is connected with a drilling tool entering a well before the fallen object is fished, before the drilling tool drills the bottom of the well, the fishing cup is made to move downwards gradually, sand settled at the bottom of the well is flushed, after the tool reaches the bottom of the well, the fishing kelly-down is checked, the cycle displacement is set to be large, a rotating disk is rotated intermittently, a large amount of slurry flushes the fallen object at the bottom of the well frontwards through the water hole and the inclined spray nozzle at the moment, and the fallen object is turned upwards from the fan-shaped cup opening; when the fallen object passes through the fan-shaped cup opening, due to the sudden increase of the area of an annular space and the decrease of the flow speed, the fallen object begins to drop; when the dropping fallen object is just aligned with the cup body, the fallen object enters the cup body or when the dropping fallen object is in contact with the cup horseshoe-shaped opening rotating intermittently along with the rotating disk, the fallen object is stirred to move towards the center of the cup body, and the fallen object smoothly enters the cup body to be fished through the support of a well wall.

Description

technical field [0001] The invention relates to the large-sized litter that is difficult to salvage at the bottom of the well during oil drilling and workover. Background technique [0002] When large-scale falling objects such as multiple cones, blades of PDC drill bits, and heads in wellhead tools occur during oil drilling and workover construction, tools such as multi-wheel overshots and reverse circulation fishing cups cannot catch the falling objects. The method of high-efficiency shoe grinding and milling can be used to deal with the falling objects at the bottom of the well. However, due to the wear resistance of the cemented carbide on the gear wheel and the teeth of the pliers on the blade of the PDC bit, etc. Only high-efficiency grinding shoes may not be able to completely clean these large falling objects. Continuing to use high-efficiency grinding shoes will delay the timeliness and delay the progress of oil and gas exploration. Contents of the invention [0...

AI Technical Summary

Problems solved by technology

[0002] When large-scale falling objects such as multiple cones, blades of PDC drill bits, and heads in wellhead tools occur during oil drilling and workover construction, tools such as multi-wheel overshots and reverse circulation fishing cups cannot catch the falling objects. The method of high-efficiency shoe grinding and milling can be used to deal with the falling objects at the bottom of the well. However, due to the wear resistance of the cemented carbide on the gear wheel and the teeth of the pliers on the blade of the PDC bit, etc. Only high-efficiency grinding shoes may not be able to completely clean these large falling objects. Continuing to use high-efficiency grinding shoes will delay the timeliness and delay the progress of oil and gas exploration

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