Releasing tool

Abstract

The invention discloses a releasing tool which comprises a joint, a core tube, a spring, a jacking sleeve, a connecting barrel, clamping tile, a sealing device, a guiding shoe, a parent lock ring, a limiting barrel and a sealing barrel. A first end of the core tube is hermetically and fixedly connected with the joint, the connecting barrel sleeving outside the core tube is fixedly connected with the joint, an annulus is formed between the connecting barrel and the core tube, the spring, the jacking sleeve, the clamping tile and the sealing device are sequentially sleeved on the core tube, the clamping tile can axially slide along the core tube, is provided with a left-hand sawtooth external thread, and is divided into multiple portions circumferentially, the end portion of the clamping tile is provided with an inner bevel, the core tube is provided with a bevel boss corresponding to the inner bevel, a first boss is arranged on the core tube, the inner surface of the clamping tile is provided with a second boss corresponding to the first boss, the sealing device used for sealing between the core tube and the sealing barrel is sleeved at a second end of the core tube, the second end of the core tube is connected with the guiding shoe, the parent lock ring is arranged in the limiting barrel and can axially slide, the sealing barrel and the limiting barrel are fixedly connected, and the parent lock ring is provided with a left-hand sawtooth internal thread. The releasing tool is easy to assemble and operate.

Description

technical field [0001] The invention relates to a hands-free tool, which belongs to the technical field of downhole tools for oil and gas wells. Background technique [0002] In order to improve oil and gas recovery, more and more oilfields at home and abroad adopt the drilling method of horizontal wells, and in terms of the completion methods of horizontal wells, many wells choose the open-hole completion method of horizontal well staged acid fracturing, During the implementation of acid fracturing stimulation construction, the drop-off tool undertakes the tasks of sending the segmented fracturing tool string into the well and dropping the tool after the tool is set and sealed. Therefore, the performance of the lost-hand tool is directly related to whether the acid fracturing stimulation can be successfully completed. Practice has proved that the lost-hand tool is an extremely important tool in staged fracturing tools, and it is also one of the tools with the highest risk....

AI Technical Summary

Problems solved by technology

Therefore, the traditional forward turning operation is complicated

If you do not lift up and rotate forward repeatedly: 1. It may not be possible to complete the forward rotation; 2. It may cause thread damage, which will directly affect the normal release and the subsequent tie-back of the tie-back string, which will bring new problems to the construction. greater risk

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