Step-by-step deblocking segmental releasing tool

Abstract

The invention relates to a step-by-step deblocking segmental releasing tool. The step-by-step deblocking segmental releasing tool comprises an upper joint, an outer sleeve, a connecting pawl, an O-shaped sealing ring, a deblocking pin, a piston, a connecting head, a releasing pin, a center pipe, a screw cap, and a lower joint; the upper joint is connected with the outer sleeve through a thread structure and sealed through the O-shaped sealing ring; the upper joint is connected with the connecting pawl through the thread structure; a piston is mounted between the outer sleeve and the connecting pawl, and fixedly connected with the connecting pawl through the unblocking pin; a lower lock pawl of the connecting pawl is embedded between the connecting head and the piston and locked, and the connecting head is connected and fixed with the center pipe through the releasing pin; the outer sleeve is connected with the screw cap through the thread structure, and the screw cap sleeves on the center pipe and is sealed by the O-shaped sealing ring; the center pipe is in threaded connection with the lower joint and sealed by the O-shaped sealing ring. The step-by-step deblocking segmental releasing tool has the advantages of preventing failure of advance deblocking of a packer, and realizing the step-by-step deblocking and segmental releasing; the step-by-step deblocking segmental releasing tool is reasonable in structure design, simple to operate, safe and reliable in use, and high in success rate.

Description

technical field [0001] The invention relates to an unblocking supporting tool for downhole operation pipe strings in the field of petroleum mechanical oil recovery, in particular to a step-by-step unblocking and segmented throwing tool. Background technique [0002] Due to factors such as complex burial geological conditions, deep burial, and large well deviation, the number of layers of oil and water wells is increasing, and there are more and more tools such as packers for downhole operation strings. First, Due to the complex stress of the layered pipe string, the load of the surface equipment cannot be fully and effectively transmitted to the downhole oil layer layer section due to the limitation of the wellbore and severe eccentric wear during the removal of the pipe string, which increases the difficulty of unsealing; secondly, due to the Factors such as temperature, pressure, and gravity cause expansion and contraction deformation and creep of the tubing string, result...

AI Technical Summary

Problems solved by technology

[0002] Due to factors such as complex burial geological conditions, deep burial, and large well deviation, the number of layers of oil and water wells is increasing, and there are more and more tools such as packers for downhole operation strings. First, Due to the complex stress of the layered pipe string, the load of the surface equipment cannot be fully and effectively transmitted to the downhole oil layer layer section due to the limitation of the wellbore and severe eccentric wear during the removal of the pipe string, which increases the difficulty of unsealing; secondly, due to the Temperature, pressure, gravity and other factors cause expansion and contraction deformation and creep of the pipe string, resulting in premature unsealing failure of the packer

[0003] The currently used telescopic compensator uses hydraulic pressure to push the piston upward, and the elastic connection limit is released by cutting the pin. Under the tension of the pipe string, the relative movement of the inner and outer pipes is compensated. The problem of unsealing failure, but when the pipe string is stuck, it cannot be effectively discarded to realize segmented salvage, while the current discarding tool can only realize the release of hands, but it cannot solve the problem of early failure of the pipe string due to peristalsis

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