Underground remote control locking device and remote control locking method

Abstract

The invention relates to an underground remote control locking device and a remote control locking method, and belongs to the technical field of petroleum and natural gas well drilling. By-pass holes are formed in a body, a locked body and an unlocking sleeve; the locked body is arranged at the inner side of the body, the unlocking sleeve is arranged at the outer side of the body, and the body is connected with an upper casing through screw threads; the middle part of the body is provided with grooves, locking blocks are arranged in the grooves of the body, and the number of the locking blocks and the grooves of the body in the circumferential direction is at least two; the middle part of the locked body is provided with a concave groove, and the axial profile is in a tooth shape and is engaged with the locking blocks; the inner side of the lower part of the unlocking sleeve is provided with an annular concave groove, and the annular concave groove is matched with an inclined surface lug boss of the locking blocks; an unlocking sleeve spring is arranged in an annular space formed between the unlocking sleeve and the upper end surface of the intermediate-diameter part of the body, and a locked body spring is arranged in an annular space formed between the lower part of the locked body and the side surface of the major-diameter end of the body; a sealing ring is arranged in a corresponding position of the unlocking sleeve and the body. The underground remote control locking device and the remote control locking method have the advantage that the multiple locking and unlocking of components is realized.

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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