SU861556A1 - Disconnector - Google Patents

Description

(54) DISCONNECTOR

The design refers to the area of the well casing and can be applied when descending casing. Known cam disconnector containing a carrier shaft with cams, cam clutch having grooves n 11 below the cam lip; The disadvantage of this disconnector is the difficulty of disconnecting it from the standpipe column. This is due to the fact that after the carrier column is lowered, it must be turned to 90® to disconnect it. With a large depth, it is impossible to determine that the supporting column is turned to the required angle: it is difficult. And with a partial exit of the cams from the grooves with the subsequent lifting of the carrier pipe, the kulaks can. to be divorced. -. As a result, disconnecting the disconnector from the casing will be impossible. . The closest of the known technical solutions to the proposed invention is a disconnector, containing a carrier shaft with cams and an annular protrusion, associated with a carrier shaft, a shear element, a coupling with a cam protrusion, "nuts and slots on the inner surface 12. Since in order to detach from a lowered bsydny column, the supporting pipe should be turned at a certain angle, then with a large depth, the difficulties of disconnecting are obvious. If the cams leave the cams incompletely, if an attempt is made to try to carry the pipe, because of the small area of the cams in contact with the pin of Ash, the cams will be wedged in the cam clutch. It is very difficult to make and re-connect with a lowered casing string for the same reason that the carrier tube must be ejected again at the definite angle after hitting it. grooves. The aim of the invention is to increase the reliability of the disconnection and re-connect with a secret obadvoy. The goal is achieved by the fact that the coupling has two slots that coincide in radia section with a digitally located main slots and are located underneath. On f. 1. depicts the proposed 1 interrupter in the transport positiv-.

SRI; figure 2 - section aa in fig.if if fig.Z is a section bb in figure 1; figure 4 - section bb In figure 1.

The disconnector consists of a coupling 1, carrying trunk 2 with cams 3, funnel 4.

The bearing barrel 2 above the cams 3 has an annular protrusion 5 on which a seal 6 is placed, which ensures the tightness of the entire assembly.

The clutch 1 is made on the inner surface with a cam protrusion 7 in contact with the cams 3 during the descent of the casing 8. The cam protrusion 7 has grooves 9 for passing the cams 3 at the moment of connection and disconnection with the casing.

Below the cam protrusion 7 in the coupling 2, grooves 10 are made, which serve as continuation of the grooves 9, and grooves 11 / serving for the factory of the cam 3 to grip the cam protrusion 7. The grooves 10 and 11 are separated by basic slots 12.

In the coupling 1 below the splines 12 there are two diametrically located slots 13, which coincide in radial section with the main splines 12.

The disconnector is fixed in transport position with shear pins 14. At the top, the supporting barrel 2 is threaded for connection to the drill pipes.

In the case of casing-mounted wells on the cement stone, the cam disconnector may contain a washing unit, which during the RPM (waiting for cement to harden) flush the well over the funnel 4.

Disconnector works as follows.

The disconnector is installed on the top pipe of the countersunk column and lowered into the well on the drill pipe.

In the process of lowering the blind casing 8, if necessary, rotate it, which is ensured by the presence of cams 3 a;

after the descent of the secret joint and its cementation, the drill pipes and the supporting barrel 2 are lowered. When the calculated unloading value from the weight of the drill pipe is reached, the pins 14 are cut off, which is signaled at the top by an increase in the drill string weight. The latter begin to lower again until the stop of the annular protrusion 5 into the upper end of the coupling 1. After this, the drill pipes turn to the right side of the cams 3 into slits 12. When lifting, the supporting pipe 2 together with the cams 3 freely comes out of the coupling 1, thanks to the restriction of the rotation of the splines 12 and the direction of their cams 3 in the grooves 9.

If it is necessary to reconnect, drill pipes are lowered until the lower end of cam 3 is seated on the upper end of clutch 1 and, turning them a little, they fall by cams 3 into grooves 9 and further into grooves 10. Lowering the ring lug 5 into the upper end of coupling 1, drill pipes turn left, about half a turn, so that the left side of the cams 3 Rested against the slots 13. When

lifting the drill pipes, the cams 3 are guided into the grooves 11 and reach the cam projection 7. As a result, the disconnector was connected to the countersunk casing 8.

A disconnector allows, if necessary, to reconnect to the casing.

The technical and eclectic effect resulting from the use of a disconnector results from a reduction in the cost of eliminating emergency situations due to the breakdown of parts of the disconnector.

Claims (2)

1.Levin B.M., Vaulin V.P. The descent and suspension shank when attaching wells. Gromamy, 1970, pp. 79-83. 2. USSR author's certificate of 55 per application 2818675/03, cl. E 21 V 33/14, 1978 (prototype). Aa li / i /