SU1121382A1 - Arrangement for unscrewing the drill string - Google Patents

Abstract

A DEVICE FOR EXTENDING A DRILLING BITCH, including a mechanism for rotating a drill rod and a mechanism for keeping the shaft from rotating with a drive, the bodies of which are rotatably mounted relative to each other and have stops for interconnection, in order to increase the efficiency of the device by providing retaining the smooth stem rods, the retention mechanism is equipped with pivotally connected levers and a cross member, which are pivotally mounted there are cams on them, the casing being made with a guide in which the cam of the traverse is placed, and the levers are connected with the drive.

Description

The invention relates to the drilling of wells, namely to devices for downhole operations.

A device for unscrewing drill rods is known, which contains a mechanism for turning the drill rod and a mechanism for holding the rod from the rotation 1.

A disadvantage of this device is that the unscrewing process starts earlier than the mechanism for holding the rod reliably fixes it, which reduces the durability of the drill rod and the mechanism for holding the rod against rotation.

Closest to the present invention is a device for unscrewing a drill rod, including its mechanism for rotating the drill rod and the mechanism for keeping the rod from being turned with a drive, the bodies of which are installed with the possibility of rotation relative to each other and have stops for interconnection 2.

A disadvantage of the known device is the need to re-feed the drill rod up and down to match the grooves of the drill rod and the fork of the holding mechanism, which reduces the overall performance of the device.

The purpose of the invention is to increase the efficiency of the device by ensuring the maintenance of smooth-bore rods.

This goal is achieved by the fact that, in a device for unscrewing a drill rod, consisting of a mechanism for rotating a drill rod and a mechanism for keeping the shaft from rotating with a drive, the bodies of which are rotatably mounted relative to each other and have stops for interconnection, the retention mechanism is provided spring-loaded with respect to the body, pivotally connected levers and a crossmember, which have pivotally mounted cams on them, the casing being designed with a guide, in which the grass cam is placed sy, and levers coupled with the drive.

Such an embodiment of the device makes it possible to hold the rod against rotation in any place, which increases the efficiency of the device.

FIG. 1 shows the proposed device, the plan; in fig. 2 is a section A-A in FIG. one.

The device for unscrewing the drill rod comprises a rotation mechanism 1 of the drilling rod 2, a mechanism 3 for holding the rod 4 against rotation, the bodies 5 and 6 of which are equipped with stops 7 and 8 and are connected by a cylindrical guide 9 for rotation relative to each other. Stops

7 and 8 are installed with the ability to interact with each other. As the rotation mechanism 1 of the drilling rod, a rotator of the drilling machine with cams 10 of the spindle 11 is used.

The mechanism 3 for holding the rod 4 against twisting has levers 12 that are pivotally connected to the crossmember 13. The levers 12 are connected by means of the rod 14 and the additional lever 15 to the drive shaft 16, the body of which is fixed to the body 6 of the shaft 3 holding mechanism. On the levers 12 and the traverse 13, the cams 17 are hinged together. The cam 17, fixed on the traverse 13, is placed in the guide 18 mounted on the body 6 of the shaft-holding mechanism 3 against rotation. The levers 12 are provided with springs 19, the ends of which are fixed to the body 6. The housings 5 and 6 are interconnected by a spring 20.

The device works as follows.

The drilling rod 2, rotating or non-rotating, is lifted out of the well with the help of the feeder until the end of the rod 4 does not fit to the cams 17, and becoming 2 still remains in the cams 10 of the rotation mechanism 1. Then, with the aid of the actuator 16, the levers 12 are folded, as a result of which the cams 17 seize the rod 4, which carries along the body 6 of the holding mechanism 3. The latter rotates in the cylindrical guide 9 until the lugs 7 and 8 interact, while the body 6 with the mechanism 3 holding together with the rod 17 clamped by the cams 17 stops abruptly and becoming 2 in the well, clamped by the cams 10 of the spindle 11 , continues to rotate (clockwise), as a result of which the breaking of the threaded joint of the rod 4 and the rod 2 occurs.

After unscrewing the threaded joint using the actuator 16, the levers 12 are diluted, while the cams 16 release the rod 4, and the springs 19 intermix the traverse 13 and the levers 12 to form a gap between the rod 4 and the cams 17. After releasing the rod 4, the mechanism 3 is held under The spring spring 20 returns to its original position.

Due to the fact that the shaft is gripped by the retention mechanism for its smooth part, the necessity of re-lowering and raising the rod is eliminated, which reduces the time spent on its removal and thereby increases its efficiency.

17 18

J

FIG. 2

633

five

Claims (1)

DEVICE FOR UNLOADING A DRILL STAW, including a mechanism for rotating the drill stand and a mechanism for holding the rod from turning with a drive, the bodies of which are mounted for rotation relative to each other and have stops for interaction with each other, characterized in that in order to increase the efficiency of the device due to to ensure retention of the smooth ”bony rods, the retention mechanism is equipped with artificially connected levers and a traverse spring-loaded relative to the body and pivotally mounted on either x cams, moreover, the housing is made with a guide in which the cam of the beam is placed, and the levers are connected with the drive. ye SLE QO bc Fig., 1