SU976014A2 - Mechanism for holding a drill string - Google Patents

Description

() MECHANISM OF CONTAINMENT OF DRILLING COLUMN

one

The invention relates to the drilling of wells, namely to devices for retaining a drill string.

According to the main author. St. No. 523981 is known for the retention mechanism of a brown column, including a body, a clamping ring with guides, sliders, and clamping dies interacting with sliders along inclined planes l 1 3.

The disadvantage of this mechanism is that it does not ensure complete adherence of the sliders to the guides, which causes their increased wear and thereby reduces the reliability of the mechanism.

The aim of the invention is to increase the reliability of the mechanism by preventing slides from imbalance.

This goal is achieved in that the mechanism is provided with inserts.

mounted on a clamping ring pivotally connected with sliders.

This embodiment of the device prevents the sliders from tilting and ensures that the sliders fit snugly against the guides, which makes it possible to reduce the distance between the reactions of the sliders on the clamping ring.

O In FIG. 1 shows the proposed mechanism, a general view; in fig. 2 shows section A-A in FIG. one.

The mechanism consists of a housing 1 and a clamping located inside it.

Claims (2)

5 rings 2. The ring 2 is made with radially arranged guides 3 for moving the sliders 4. The sliders k are made with inserts 5 mounted on the axles 6, the sliders are connected to the rods of the hydraulic cylinders 7 and are in contact on inclined self-braking surfaces with the dies 8; ring-rings 39 9 located in the windows. On the case 1, the hydraulic cylinders of the locking 10 are mounted, the rods of which are connected to the ring 2. In the windows of the latter, the hydraulic cylinders of the split 11 are installed, the rods of which are in contact with the ring-ring 9. The mechanism works as follows. In the initial position, the dies 8 and the sliders 4 are in the leftmost position. When the lock of the drill string 12 stops against the dies 8, the working fluid is supplied to the hydraulic cylinders 7) the rods of which move the sliders k together with the dies 8 to the right until the dies 8 stop to the lock of the drill string 12, and then apply pressure to the hydraulic cylinders of the spell 10 and clamping ring 12 with the sliders moving upwards. At the same time, the slide blocks i slide along the inclined planes of the dies 8 and press them against the lock of the drill string 12, simultaneously tilting moments are created on the slide blocks 4, which press the contributions shea 5 to the guides 3 along surfaces B; wedge them and ensure reliable retention of the column by 12 dies 8. The return of the mechanism to its initial position is carried out in the following sequence. The pressure is relieved from the hydraulic cylinders of the casting 10 and the 4th boma of the fluid is fed into the hydrocyliidry of the P. The working fluid is then supplied to the hydraulic cylinders 7i, the rods of which, together with the sliders, move to the left and retract the dies 8 from the drill string 12. By reducing the distance between the reactions of the sliders to the clamping ring when they jam on the rails, the wear of the contacting surfaces decreases and thereby improving the reliability of the mechanism. Claims of the Invention Mechanism for retaining a drill string according to ed.St. No. 523981, that is, so that, in order to increase the reliability of the mechanism by preventing the sliders from tilting, it is equipped with inserts mounted on the clamping ring and hinged to the sliders. Sources of information taken into account in the examination of 1, USSR Author's Certificate W 523981, cl. E 21 B 19/10, 1973