Downhole remote control locking device and remote control locking method

Abstract

A downhole remote control locking device and a remote control locking method belong to the technical field of oil and natural gas drilling. There are bypass holes on the main body, the locked body and the unlocking sleeve; the locked body is installed on the inner side of the main body, the unlocking sleeve is installed on the outer side of the main body, and the main body and the upper shell are connected by threads; the middle part of the main body is slotted, and the locking block is installed In the groove of the body, there are at least two slots between the lock block and the body in the circumferential direction; there is a groove in the middle of the locked body, and the tooth shape in the axial section meshes with the lock block; there is an annular groove on the inner side of the lower part of the unlocking sleeve. Groove, matched with the slope boss of the lock block; the unlocking sleeve spring is placed in the annular space between the unlocking sleeve and the upper end surface of the mid-diameter part of the body, and the locked body spring is placed between the lower part of the locked body and the large-diameter end of the body In the annular space between the sides; there is a sealing ring at the corresponding position of the unlocking sleeve and the body. The invention enables multiple locking and releasing of components.

Description

technical field [0001] The invention relates to an underground remote control locking device and a remote control locking method. It belongs to the technical field of oil and natural gas drilling. Background technique [0002] In the design of downhole tools for oil drilling, many situations involve the locking and releasing functions of a certain part of the tool. At present, the locking mechanisms used in most tools have the following deficiencies: some mechanisms cannot operate the locking and releasing of the locking mechanism in the tool through ground remote control, which is not conducive to the control of the tool; some mechanisms fix the two parts through pins , when separation is required, increase the pressure difference by throwing a ball and shear the pin to achieve separation. This mechanism can only be used to release the locking mechanism once and cannot be reused. It is not suitable for tools that need to be controlled multiple times in the well. The downh...

AI Technical Summary

Problems solved by technology

At present, the locking mechanisms used in most tools have the following deficiencies: some mechanisms cannot operate the locking and releasing of the locking mechanism in the tool through ground remote control, which is not conducive to the control of the tool; some mechanisms fix the two parts through pins , when separation is required, increase the pressure difference by throwing a ball and shear the pin to achieve separation. This mechanism can only be used to release the locking mechanism once and cannot be reused. It is not suitable for tools that need to be controlled multiple times in the well. The downhole working conditions are complicated, and sometimes unexpected impact may cause the pin to be interrupted, and the parts are released in advance, resulting in adverse consequences; The axial dimension of the mechanism is relatively long, and it will be disengaged and released when it bears a relatively large axial thrust. The radial piston locking mechanism has the disadvantages of small contact area, large stress, and easy failure. Moreover, the two mechanisms It is required to first determine the relative axial position of the two parts, and then trigger the locking sleeve or the radial piston action to lock, the operation is more cumbersome

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