Device for screwing and unscrewing pipes

 

(57) Abstract:

Device for screwing and unscrewing drill pipes, casing and tubing used in the process of tripping the drilling and operation of oil and gas wells. The device is a cylindrical housing mounted on bearings in the frame. Inside, there are two rings connected by flexible elements, arranged parallel to the longitudinal axis of the housing circumference. The lower ring connected to the housing with the projections of slots placed in the appropriate boxes of the lower shell. In the same boxes on the tabs of the ring placed springs, providing movement of the lower ring up and down. The top ring can rotate on the bearing relative to the housing. The casing in the upper part constantly braked by the brake. The capture of a pipe located in the internal cavity of the housing, is carried out by means of flexible elements, shifting the center of the inner cavity of the housing and evenly covering the outer surface of the pipe body when the rotation of the upper leading ring relative to the stationary housing. The greater the angle of rotation of the upper ring relative to the bottom, the bol is actiuni tractive effort transmitted by flexible elements of the lower ring, size greater than the friction in the node chassis - brake", the body starts to rotate together with the clamped pipe. Moreover, the greater the resistance to rotation, the greater the force of compression of the flexible elements of the pipe body, that is, increases torque. After completion of the screwing or unscrewing of the springs return the lower ring to its original position, the flexible elements are arranged parallel to the axis of the housing, the device is again ready for operation. The proposed design is simplified and prevents wear on the pipe outer surface. 1 Il.

The invention relates to techniques for drilling wells, namely, devices for screwing and unscrewing drill pipes, casing and tubing.

A device for screwing and unscrewing pipes, comprising upper and lower grips installed with the possibility of rotation, and the node connecting them (USSR author's certificate N 115325, MKI E 21 B 19/16).

The downside of it is the design complexity, the rapid wear of the pipes.

The aim of the invention is to simplify the design, elimination of wear of the tubes on the outer surface.

This goal is achieved by the ability of reliable coverage of the pipe body for transfer of torque.

The drawing shows the device of the screwing-unscrewing pipes, presents the General section of the form.

The device consists of a cylindrical housing 1 mounted on bearings 2 in the frame 3. Inside the housing 1 is placed two rings 4 and 5, connected by a flexible elements 6 arranged parallel to the longitudinal axis of the housing circumference. The lower ring 5 is connected to the housing 1 by means of the outer tabs-slots placed in the appropriate boxes of the lower part of the body, in the same boxes on the tabs of the ring 5 placed springs 7 which provides for the movement of the lower ring 5 up and down. The upper guide ring 4 can rotate on the bearing 8 relative to the housing 1 and is connected with the motor 9 through the gear 10. Case 1 in the upper part constantly braked by the brake 11.

The device operates as follows.

When turning the master ring 4 relative to the stationary housing 1 and fixed to the lower ring 5 flexible elements are shifted to the center of the internal cavity of the housing 1 and uniformly cover the outer surface of the pipe body, which is in the cavity of the housing 1. When the pulling force transmitted by the flexible elements of the lower ring 5, reaches values.

Moreover, the greater the resistance to rotation, the greater the force of compression of the flexible elements of the pipe body, i.e., increases torque, transmitted by flexible pipe elements.

The feature of this design is that the greater the angle of rotation of the male rings are relatively immobile, the more decreases the distance between the rings vertically, because the length of the flexible elements unchanged. Therefore, the lower ring 5 is fastened in the housing 1 can move the points up and down and is spring-loaded.

After completion of the screwing or unscrewing pipes of the motor 9 is stopped and the spring 7 returns the lower ring 5 to the initial position, the flexible elements 6 becomes parallel to the axis of the housing and the device is ready to work.

Device for screwing and unscrewing pipes, comprising a housing mounted on bearings in the frame, inside of which are placed two rings, wherein the rings are interconnected by flexible elements, arranged parallel to the longitudinal axis of the housing circumference and having the outreach of the pipe outside diameter and the transfer of torque, while the top ring is made leading to rotate the but and the case locked brake.

 

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