SU78845A1 - A device for determining the configuration of a fractured pipe in a borehole - Google Patents

Description

If the drill pipe breaks during the drilling process, various tools and devices are used to extract the remaining bottom of the drill string: overshots, bells, taps, internal and external pipelines.

The end of the pipe is sometimes so destroyed that it cannot be seized with a tool. In this case, it is necessary to carry out preparatory work, i.e., to process the end of the pipe with special milling machines. To decide which type of mill to use, you need to know in what condition the end of the pipe is.

To inspect such damage, in squalling, the already known use is as follows: called "printing - a tip with a lead jacket.

The disadvantage of this device is that the imprint is not obtained around the entire circumference of the pipe and does not give the depth of oblique fractures and bends.

In order to eliminate these drawbacks, according to the invention, an instrument is proposed for determining the configuration of a fractured tube e of a borehole.

FIG. 1 The device is shown in longitudinal section; on phpg. 2 shows a section along AB of FIG. one.

In the upper part of the housing / device there is a tapered thread a for connection to the drill collar.

The shaped plate 9 is screwed to the body / on the screws 10, having a recess for the screw head 5 in the center of the lower surface, and a ledge in the upper part.

A rubber ring 8 with holes is mounted on the plate 9. Somewhat higher inside the body / the grille b was attached with heat-treated rods 7 installed in its holes in the amount of 200-250 pcs. The rods 7 are held in the lattice with 6 heads.

The diameter of the holes in the rubber 8 is half the diameter of the rods 7.

A SCREW 5 is screwed into the central hole of the plate 9;

Hole b in the housing / shchuzhit to release air when lifting

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rods 7 upwards and for access to nut 2.

Use of the device is as follows.

The assembled device (the rods 7 are installed in the initial lower position, the screw head 5 is recessed into the undercut of the PLATE 9, the wild 4 is in the upper position) is screwed down with a tapered thread and lowered onto the end of the drill string.

As soon as the device comes into contact with the fracture of the pipe, the rods 7 will start iodine action of the weight of the device moving upwards along the entire circumference of the pipe, depending on the configuration of the fracture.

The device is removed from the well. Since the rubber 8 tightly covers the protruding rods, they cannot go down.

In a retrieved instrument, a rod-fixed configuration of a fracture tube is measured.

Then, turning the screw 5 to the left with the help of the socket wrench until the failure, lower the disk 4, and with it the rods 7 to the initial position. After that, turning the screw 5 to the right until refusal raise the disk 4 and the device vio: ready to use.

The rods 7 can be fixed in the device by clamping them

a low-melting, solidifying mass, which is heated by an electric heating device built into the body of the device.

Subject invention

Claims (3)

1. A device for determining the configuration of a fracture of a pipe in a borehole, characterized in that, in order to obtain a spatial impression of a fracture, the device is made of a cylinder equipped with a drill sub in the upper part and a disk with holes drilled in it in the lower part for rods intended to come into contact with the broken point of the pipe and because of their mobility in the holes of the disk reproducing the configuration of the fracture. 2. The form of the apparatus according to claim 1, characterized in that, in order to hold the rods, the disc is provided with a rubber gasket with openings smaller in size than the diameter of the rods. 3. Variations of the device, about UH, e, so that the rods are held by a solidifying low-melting mass, the latter is heated by an electric heating search built into the body of the device. No. 78845