SU768931A1 - Apparatus for gripping tubes in rotor - Google Patents

Description

one

The invention relates to the oil and gas industry, in particular, to equipment for drilling oil and gas wells.

A device for gripping pipes, 5 containing plates, pressed by a rod installed between the cheeks and connected to them by means of axles, and supporting elements 1 is known.

However, this device can only be used to capture smooth-bore drill strings.

It is also known a device for gripping tubes in a rotor, comprising a housing with a detachable liner with a 15 tapering outer surface placed in it, lines connected with guides and a drive, and a centralizer 2.

The disadvantages of this device are the following: 20

limited sizes of captured pipes;

the need to use on the rig several types and sizes of gripping devices (mechanized wedge-25, grips, spiders, hand-held, wedges);

the impossibility of preventing the case of pipe wedging under heavy loads due to the almost complete coverage of the pipe body wedges with the serrated surface; thirty

the impossibility of preventing wedges from jamming in the liner when metal particles hit the bearing surface in other cases.

The aim of the invention is to increase the efficiency of the device by allowing the capture of pipes of different diameters with one mechanism without damaging them.

The goal is achieved by the fact that the inner surfaces of the housing and the detachable liner are made with inclined grooves having a flat bottom, the conical outer surface of the detachable liner is made with the slots under the guides, and in the flat bottom of the groove of the housing there are areas corresponding to the conical outer surface of the detachable liner. In addition, a detachable liner is placed on the centralizer and installed with a gap relative to the housing and guides.

FIG. Figure 1 shows a general view of the device in the position of gripping tubing, drill pipes, loose pipes of small and medium diameter, and casing pipes of small diameter; in fig. 2 — seizure of mature pipes of large diameter and casing pipes of medium diameter; in fig. 3 - capture of casing pipes of large diameter; in fig. 4 - a section yo wedge m, which captures obsadyyyo large diameter pipes rta of FIG. 5 shows a section of the device along the section 151 101CYM with wedges with grooves under the direction, in the conical outer surface of the detachable liner and the gap between the wall of the groove and the guide; in fig. 6 shows a section along the wedge, a wrench and a pumping press, drill pipes, fitted pipes, as well as casing pipes of small and medium diameter.

A housing 2 is placed in the rotor 1 of the drilling unit, inside the second one there is a detachable liner 3 with a conical outer surface 4, and the liner 3 rests on a centralizer 5 located in the lower part of the case 2. Inside the centralizer 5 there is a centralizer 6. In the grooves 7 the outer surface of the case 2 and the grooves 8 of the outer surface of the liner 3 are fitted with guides 9 to which wedges 10 are attached for tubing, drill pipes, small and medium diameter pipes and small diameter casing pipes. The GO wedge, through the guides 9, is connected to the ring 11, into which the lifting lever 12 enters, which is connected to the driving device.

The inner surface of the housing and the detachable liner is made with inclined grooves 13, 14, having a flat bottom. In the flat bottom of the groove 13 of the housing 2 there are portions 15 corresponding to the tapered abutment surface 4 of the detachable liner 3. The detachable insert is installed with a clearance between the housing body and 4 and has relative guides 9 with a clearance 16.

A centralizer 6 is removed and a wedge 17 is fitted to grip large-diameter tubular pipes and medium-sized casing pipes (Fig. 2). To grip large-diameter casing pipes, a separate wedge 5, a wedge 10, 17, and a centralizer 5, 6 are removed (Fig. 1 and I) and a centralizer 18 and a wedge 19 are installed.

For wedges 10, 17, 19, the gap 20 between their toothed elements 21 should not exceed the thickness of the wall of the pipe being gripped, which is achieved by a corresponding gap 22 between the wedge 10, 17, 19 and the walls 23 of the yoke 13 of the housing 2 and the grooves 14 of the detachable insert 3.

The operation of the device is as follows.

The wedge grips the pipes by moving the wedges along the grooves of the body and liner.

When lifting the wedges, the gripped pipe string is released, and the wedge is diluted so as not to hinder the movement of the pipe string within the bore of the centralizer. If during the movement of the column captured by the wedges, the upward wedges do not rise due to their wedging in the detachable liner, then each half of the liner begins to move upwards and to the sides along the koius surface of the hull and wedging occurs.

In order to ensure wedging between the outer conical surface of the detachable liner and the conical inner surface of the housing, in position to grip the pipes, there must be a guaranteed clearance, which is eliminated when the pipe is gripped. In order to wedge out, a guaranteed clearance is required between the walls of the grooves 8 of the separable liner 3 and the guides 9.

Lowering the wedges to grip the pipe, as well as raising them, is carried out by turning the lifting lever 12 associated with the drive device.

When the lever is rotated, the ring AND, the guides 9 and the wedges 10, 17, 19, are raised or lowered.

Fryula Invention

1. A device for gripping pipes in a rotor, comprising a housing with a detachable liner with a tapered outer surface, wedge associated with guides and a drive, and a centralizer, characterized in that, in order to increase the efficiency of the device, enabling the mechanism to pick up pipes of different diameters without damage; the inner surfaces of the housing and the detachable liner are made with inclined grooves having a flat bottom, the conical outer surface of the detachable liner being made with grooves for the guide, but in a flat bottom of the housing there are groove portions corresponding conical outer surface releasable liner.

2. The device according to c. 1, characterized in that the detachable liner is placed on the centralizer and is installed with a gap relative to the housing and guides. Information sources,

taken into account in the examination

1. Avtorskoe with detlstvr USSR № 508587, cl. E 21B 19/10, 23.10.72.

2. US patent number 3457605, class. 24-263, 07.29.69.

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Claims (2)

Claim 1. A device for gripping pipes in a rotor, comprising a housing with a detachable liner with a tapered outer surface placed in it, wedges connected with guides and a drive, and a centralizer, characterized in that, in order to increase the efficiency of operation of the device by providing the possibility of gripping the mechanism of pipes of different diameters without damaging them; the inner surfaces of the housing and the detachable liner are made with inclined grooves having a flat bottom, with the conical outer surface of the detachable liner made with pas seats under the guides, and in the flat bottom of the housing groove there are areas corresponding to the conical outer surface of the detachable liner. 2. 'Device pop. 1, characterized in that the detachable liner is placed on the centralizer and installed with a gap relative to the housing and guides.