Separable short section for being connected with downhole tool

Abstract

The invention relates to a separable short section, in particular to a separable short section for being connected with a downhole tool. The separable short section comprises a rubber cap, a shell top, a top center, a lead locking sleeve, a cone-shaped inner pressing sleeve, a separating sleeve and a fixing sleeve. One end of the shell body is provided with the rubber cap in an inserting mode. The other end of the shell body is provided with a pressure sealing end cap in a thread mode. The fixing sleeve is arranged in a shell body through hole between the rubber cap and the pressure sealing end cap in a thread mode. A solenoid is arranged in the fixing sleeve. A sliding locking sleeve is arranged in the solenoid. The separable short section is long in service life, simple in structure, convenient to assemble, disassemble and maintain, high in safety, small in size and convenient to move and convey, during salvaging, damage to the downhole tool or an instrument can be avoided, the problems that a traditional separating short section is complex in structure, too large in size, low in reliability and high in maintaining cost are solved, and good economic benefit is achieved.

Description

technical field [0001] The invention relates to a detachable short joint, in particular to a detachable short joint for connecting downhole tools. Background technique [0002] At present, most of the separable subs used to connect downhole tools for completion, workover and logging in oil and gas well sites are purely mechanical structures; in the prior art, the separable subs usually use shear pins In the working process, under the pulling force of the downhole tool string, the shearing pin bears the shearing force. When the pulling force of the downhole tooling string makes the shearing force on the shearing pin reach a certain value, the shearing pin is sheared, the downhole tool is separated from the separable sub. This kind of detachable sub has the following disadvantages: if the downhole tool or instrument is stuck, the core fishing technique is generally used to release the jam. Under normal circumstances, a large force is applied to the detachable sub to destroy i...

AI Technical Summary

Problems solved by technology

This kind of detachable sub has the following disadvantages: if the downhole tool or instrument is stuck, the core fishing technique is generally used to release the jam. Under normal circumstances, a large force is applied to the detachable sub to destroy it, and then the protection The downhole tools or instruments are brought out of the wellbore in good condition, but doing so will cause certain damage to the expensive downhole tools or instruments and cause safety hazards, and there may also be accidents that break the downhole tools or instruments, increasing the difficulty of fishing operations and Economic cost; in addition, in the wellbore filled with corrosive drilling fluid, the shear pins are easily corroded, which reduces the strength of the shear pins, easily causes unnecessary failure accidents, and reduces the success rate of operations

On the other hand, the traditional detachable nipples used to connect downhole tools have the disadvantages of complex structure, large volume, low reliability and high maintenance cost

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