Underground fishing tool

Abstract

The invention discloses an underground fishing tool. The underground fishing tool comprises a barrel, a fishing claw, a hydraulic telescopic structure, a pressing telescopic structure, a second piston structure and a second channel, the power end of the hydraulic telescopic structure communicates with an upper tubular column through the second channel, and the hydraulic telescopic structure is used for driving the fishing claw to stretch outwards along the circumference of the barrel; and the pressing telescopic structure comprises a telescopic part and a pressing part, the telescopic part is used for opening and closing the second channel, and the second piston structure is used for pressing the pressing part to control the telescopic part to stretch. The salvage and grabbing circulation action can be remotely controlled on the ground by taking drilling fluid as power, operation is easy, time is saved, and the fishing efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of downhole engineering machinery, in particular to an downhole fishing tool. Background technique [0002] With the advancement of oil drilling technology, the well depth continues to increase, and downhole accidents also gradually increase, the most prominent of which is the drop of downhole tools or pipe strings. If it is not dealt with in time, it will not only delay the construction period, but also cause the scrapping of oil and gas wells in severe cases, resulting in huge economic losses. The most common way to deal with downhole tool or pipe string drop is to use fishing tools to carry out fishing operations. [0003] Existing fishing tool of various forms at present, as the fishing tool of slip retractable formula, it bites fish by being provided with the multilobe slip of undercut, and fish is taken out from the well bottom. If the fish cannot be taken out normally in case of jamming, the withdra...

AI Technical Summary

Problems solved by technology

However, these two methods have their disadvantages: it is difficult to operate the fishing tool in a horizontal well by rotating the drill string, and it is not easy to rotate the drill string, and the rotation angle is not easy to control; the fishing tool is completed by lifting the drill string up and down. Exit, if stuck during the fishing process, you need to lift and lower the drill string to release the stuck, it can not be realized well, it is easy to cause the fish to fall off, and the fishing fails

In this regard, China's patent application CN201610817329.6 discloses a multifunctional inner flat drilling tool overshot, which uses drilling fluid to power the overshot on the ground to push the catch to stretch outwards to catch the fallen fish. In this state, a one-way valve is installed to ensure that the high pressure is maintained in the overshot, and the fish can be released by lowering the unjamming spear to relieve the pressure of the overshot, and after lifting the unjamming spear, the drilling fluid can be used again to make the fishing tool move, so it can reciprocate Catch the fish and get rid of the fish, and the success rate of salvage increases, but there are at least the following problems: it takes a long time to lower the spear into the pipe string and lift it to release the jam

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