Pressure salvaging device for pipe tapping falling piece

Abstract

The invention discloses a pipeline tapping falling piece under-pressure fishing device which comprises a sealing structure provided with a sealing shell and a supporting sleeve. The first lifting mechanism is provided with a first pull rod; the second lifting mechanism is provided with a second pull rod; the salvage structure is provided with a guide part and a salvage assembly, the guide part is arranged at the bottom of the first pull rod, the top of the salvage assembly is fixed to the bottom of the second pull rod, and the salvage assembly slides along the guide part and has a first salvage state and a second salvage state; in the first fishing state, the fishing assembly is in a vertical state and vertically coincides with the center of the pipeline opening; and in the second salvage state, the tail end of the salvage assembly is horizontally bent and horizontally extends to the downstream. The sealing shell is fixed to the sandwich valve to define the anti-escape cavity, and the requirement for under-pressure fishing work can be met; the salvage position of the salvage assembly can be adjusted at will, the salvage range is wide, the salvage requirements of different salvage positions are met, and the defect that a traditional salvage device can only conduct salvage in a small range is overcome.

Description

technical field [0001] The invention relates to the field of pipeline drilling, in particular to a fishing device for pipeline drilling and falling pieces under pressure. Background technique [0002] During the process of pipe drilling, a saddle-shaped falling piece will be produced when the drilling barrel cutter cuts the hole. Although the anti-falling device is provided on the center drill of the barrel cutter, it cannot be used under some extreme conditions (such as anti-dropping device failure) there is still the risk of the falling pieces falling into the running pipeline. If the falling pieces are not salvaged in time, it will bring great trouble to the pipeline cleaning and internal inspection described later. [0003] At present, there are two main salvage methods for perforating and falling pieces in the pipeline. One is the stop-loss salvage process. This method is: empty the pipeline and manually remove the falling pieces by construction workers. In normal tran...

AI Technical Summary

Problems solved by technology

[0003] At present, there are two main salvage methods for perforating and falling pieces in the pipeline. One is the stop-loss salvage process. This method is: empty the pipeline and manually remove the falling pieces by construction workers. In normal transportation, there will be oil and gas leakage, which will pollute the environment and bring large economic losses

The other is the non-stop fishing process. This method currently has the problem that the fishing tools cannot meet the needs of large-scale fishing.

[0004] In the pipeline drilling operation, the size of the falling piece is basically the same as the size of the opening, and it is necessary to accurately find the center position of the falling piece to remove it from the opening; however, due to the impact of the air flow or liquid flow in the pipeline, the The falling pieces deviate from the hole and the deviation distance is not fixed, while the existing falling piece fishing device can only fish in a small area within the center of the hole, which cannot meet the salvage requirements of the falling pieces that deviate from the hole

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