Broaching salvage integrated tool and salvage operation method thereof

Abstract

The invention discloses a broaching salvage integrated tool and a salvage operation method thereof. The tool comprises a tool body with an axial through hole formed in the center and specifically comprises an upper connector, a thread making salvage part and a broaching part which are sequentially connected from top to bottom; the outer diameters of the thread making salvage part are gradually enlarged from top to bottom to enable the conical degrees formed by the wall face of the outer side to be (1:15)-(1:20); a triangular outer thread used for thread making is machined on the inner wall of the thread making salvage part; and a tungsten steel fragment layer used for broaching operation is arranged on the outer wall of the bottom end of the broaching part in a bead weld mode in the circumferential direction. The broaching salvage integrated tool is simple in structure, continues to use a conventional male conical method for salvage and is convenient to operate, high in under-cut success rate and applied to salvage of down-hole fallen objects with large diameters; and through cooperation of the corresponding salvage operation method, broaching, thread making and salvage operation can be completed through one-time drilling, tripping in and out do not need to be repeatedly conducted, and thus the one-time tripping in and out time of an ultra deep well is effectively shortened.

Description

technical field [0001] The invention relates to the technical field of downhole fishing for oil drilling, in particular to an integrated tool for reaming and fishing and a fishing operation method thereof. Background technique [0002] At present, the operation of ultra-deep wells is a world-class problem. For example, in the Tarim Oilfield, many wells have a depth of more than 7,000 meters and is close to 8,000 meters. It is difficult and risky to drill the target layers of deep wells and small holes, especially after drilling into oil and gas layers, overflow occurs The probability of pipe sticking is particularly high. Due to the limitation of fish falling and casing annulus clearance, it is difficult to fish falling in ultra-deep well slimholes, and the smaller the drilling tool, the more likely accidents will occur. If the wellbore where the fish falls is in good condition, the male awl can be directly lowered for fishing, but once the water hole of the fish is small, t...

AI Technical Summary

Problems solved by technology

[0002] At present, the operation of ultra-deep wells is a world-class problem. For example, in the Tarim Oilfield, many wells have a depth of more than 7,000 meters and is close to 8,000 meters. Drilling the target layers of deep wells with slim holes is difficult and risky, especially after drilling into oil and gas layers, overflow occurs The probability of pipe sticking is particularly high. Due to the limitation of fish falling and casing annulus clearance, it is difficult to fish falling in ultra-deep well slimholes, and the smaller the drilling tool, the more accidents are likely to occur.

If the wellbore where the fish falls is in good condition, the male awl can be directly lowered for fishing, but once the water eye of the fish is small, the application of the male awl is limited, resulting in the inability of the male awl to complete the fish salvage. Therefore, it is necessary to develop a An integrated tool for reaming and fishing in one pass

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