SU742574A1 - Device for engaging pipes in a rotor - Google Patents

Description

(54) DEVICE FOR CAPTURING PIPES IN ROTOR

one

The invention relates to equipment for drilling oil and gas wells, in particular to means for capturing drill pipes.

It is known) to grip a drill and casing in the rotor, which 5 includes a housing, an insert with a guiding conical surface and supporting grooves under the wedge, driving wedges 1.

The disadvantages of this device are the impossibility of switching to drilling and inserting the leading drill pipe into the rotor without removing the J lines, as well as a small torque that can be transmitted through the square hole in the upper part of the liner where the clamp J of the leading drill pipe is installed.

It is also known a device for gripping pipes, in which a housing with holes in the upper part for transmitting torque is installed inside the rotor, an insert with two conical 20 supporting surfaces under the wedge is installed in the housing, and a wedge-clamping mechanism is installed above the rotor, including the housing, wedge and drive to.;. mniv 2.

The main disadvantages of this device are:

1) the impossibility of transitioning to drilling and installing the leading drill pipe in the rotor without disconnecting the drive part and removing the wedge-clamping mechanism from the rotor;

2) the super rotor placement of the wedge-clamping device and clamping of the leading drill pipe leads to large dimensions and cumbersome clamping of the leading drill pipe. The installation of a drill pipe with a bulky clip at the center of the well and into the hole is associated with laborious work;

3) the possibility of passing the cumbersome clamping of the drive drill pipe through the key hole for screwing-unscrewing the pipes of the closed type is excluded.

The aim of the invention is to reduce the size and ensure the transfer of rotation of the drill string from the rotor without removing the wedges.

This is achieved by the fact that the device is equipped with a clamp of the leading drill pipe installed in the housing under the wedges, made in the form of a housing with installed

there are spring-loaded rocker arms with rollers and a mechanism for transmitting rotation from the clamp body to the rotor.

In addition, the upper part of the clamp body is made with an outer conical surface corresponding to the inner conical surface of the wedges, and the mechanism for transmitting rotation from the clamp body to the rotor is designed as a ring gear on the lower part of the clamp body installed inside the sleeve, which has a toothed profile on the outer and the inner surface, the inner toothed profile is connected through the intermediate jaw with the toothed crown, and the outer toothed profile to the spline grooves made on the inner surface the lower part of the device, kinematically connected to the rotor.

FIG. 1 shows the device, a general view; in fig. 2 shows section A-A in FIG. 1. In the rotor 1 of the drilling rig there is a housing 2, which has slotted grooves on the inner surface in the lower part. A detachable liner 3 with a guide cone surface and supporting grooves for a wedge is placed inside the housing in the upper part. Inside the housing, in the lower part, there is installed a sleeve 4 with a toothed profile on the inner and outer surface, with the outer teeth of the sleeve entering the slotted slots of the housing.

An intermediate gear 5 and a clamping body 6 of the leading drill pipe with a toothed wreath in the lower part connected to the intermediate gear are installed in the sleeve. In the windows of the clamping body 6, spring-loaded swinging rocker arms 7 are placed and the rollers 8 are fitted to them, which mate with the driving drill pipe. The upper part of the clamping body 6 is made with an outer conical surface corresponding to the inner conical surface of the wedges 9. The articulated suspension of the wedges 10 is provided with springs 11, which extend the upper part of the wedges from the pipe after landing them on the housing of the clamp 6. The wedges 9 are raised and lowered using strips 12 connected in the lower part of the ring 13 of the lever 14 of the pneumatic cylinder 15 and the control valve 16.

The operation of the wedge-gripping device in the process of transition from tripping to drilling and drilling is carried out as follows.

After descending into the borehole of the drill string, it is mounted on a wedge and from the hole, the driving drill pipe with clamp 17 is lifted and fed to the center of the well. The drive drill pipe is connected to the drill string. After that, the wedge 9 rises and the column is lowered into the well. In this case, the clamp 17, the passage into the hole formed by the raised wedges, is set

the nest inside the housing 2. The teeth of the clamp body 6 is engaged with the gear 5. If the axis of the drill string does not coincide with the axis of the bore hole in the rotor, the clamp 17 may not enter the slot inside the housing abut the conical surface of the detachable liner 3. After that 9 is lowered, the clamp 17, which slides along the tapering surface of the detachable liner 3, is pressed into the slot. Wedge

 abut against the outer surface of the clamping body 6, which provides for the installation of the lower end of the wedges with a gap relative to the leading drill pipe. The gap in the upper part of the wedges is provided by the springs 11,

which retracted the top of the wedges, breaking the mass of the ring 13 with the strips 12, and into this. The compressed air is released from both cavities of the pneumatic cylinder 15 and the lever 14 does not press on the ring 13. This is achieved by the control valve device 16.

0 During the drilling process, the rotation is transmitted from the rotor to the housing 1, then through the sleeve 4, the idler gear 5, the clamp body 6, the rocker 7 and the rollers 9 to the drive drill pipe. Wedge fitted with

J gap relative to the leading drill pipe and do not prevent its rotation and axial movement.

The proposed wedge-clamping device ensures the elimination of labor-intensive work on the removal of wedges during the transition from

0 tripping operations for drilling, reducing labor-intensive work when installing the drive pipe to the center of the well and into the hole, the possibility of passing the clamp of the drive drill pipe through the through hole of the wrench for unscrewing and unscrewing the pipes of the closed type.

The application of the proposed device will allow to mechanize, and in the future and automate the process of transition from tripping to drilling.

Claims (3)

Invention Formula . A device for gripping pipes in a rotor, comprising a housing, a detachable liner with a guiding conical surface, a wedge with an inner conical surface at the lower end, and a drive of wedges, characterized in that, in order to reduce the dimensions and to transmit the rotation of the rotor to the drill string without removing wedges, it is provided with a clamp of the leading drill pipe installed in the housing under the wedges, made in the form of a housing with spring-loaded rocker arms installed therein with rollers and a mechanism for transmitting rotation from the housing Ima to the rotor. 2. A device according to claim 1, characterized in that the upper part. clamp housing made with an outer conical surface corresponding to the inner conical surface of the wedges. 3. The device according to claim 1, characterized in that the mechanism for transmitting the rotation from the clamping body to the rotor is made in the inner ring gear on the lower part of the clamp body mounted inside the sleeve, which has a toothed profile on the outer and inner surfaces, and an inner toothed profile is connected through an intermediate gear with a ring gear, and the outer gear profile is connected with spline grooves made on the inner surface of the lower part of the body, kinematically connected with the rotor. Sources of information taken into account in the examination 1. USSR author's certificate number 108839, cl. Е 21 В 3/04, 1957. 2. US patent number 3457605, class. 24-263, publ. 1969 (prototype).