RU1790667C - Device for installation of junction pipe to drill pipe - Google Patents

Abstract

Usage: ensuring the tightness of the connection when inserting the pipe into pressure pipelines. The device has a plate with an axial channel 3, in which a nozzle is installed, having a curly flange 4 at one end and a connecting thread, and a sealing element 6 located inside the curly flange 4 and a sleeve made of ductile metal installed inside the annular groove 8 of the flange 4. The device is mounted on the pipe 9, which is under pressure, and is clamped with clamps using clamping nuts. During plastic deformation of the sleeve 7, the junction of the pipe with the pipe 9 is sealed. This is achieved by performing an annular sealing element 6 and the sleeve 7 with a height determined from the expressions H 2D + 15, h D +3, where H is the height of the sleeve 7 of ductile metal; h is the height of the annular sealing element 6; D is the maximum clearance between the pipe 9 and the end face of the sleeve. 3 ill. w yo

Description

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FIELD: mining. SUBSTANCE: invention relates to mining industry, in particular to devices for cutting into pipelines under pressure, for example, into a drill string.

A device is known for mounting a connecting pipe on a drill pipe, including a plate with an axial channel in which a pipe with a shaped flange at one end and a connecting thread at the other and an annular sealing element located inside the shaped flange is mounted.

Since this device does not provide the necessary tightness between the pipe and the pipe under excessive internal pressure, working with the device does not guarantee the necessary reliability and safety of work. The aim of the invention is to increase the reliability of the device.

This is achieved by the fact that the known device for mounting a connecting pipe to a drill pipe, including a plate with an axial channel, in which a pipe with a figured flange is installed at one end and an annular sealing element located inside the figured flange is provided with a sleeve of plastic material, and the end a curly flange facing the side of the drill pipe is made with an annular groove for receiving a sealing element and a sleeve therein with the possibility of its interaction with the outer surface of the pipe, the axial dimensions of the sleeve and the annular sealing element are determined from the relations:

 + 15mm h A + 3 mm

40

where H is the axial size of the sleeve of plastic material, mm;

h is the axial size of the annular sealing element, mm;

A is the maximum gap between the pipe and the sleeve sleeve, mm,

In FIG. 1 shows the proposed device in General view, side view; in FIG. 2 50 - the same, top view; in FIG. 3 - the same, after the end of mounting the device on the pipe.

A device for installing the connecting pipe 1 to the drill pipe contains a plate 2 with an axial channel 3, in which 55 a pipe 1 is installed with a shaped flange 4 at one end and a connecting thread 5 at the other and placed inside the shaped flange 4

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sealing element 6 and sleeve 7 of plastic material. The end face of the figured flange 4, facing the side of the drill pipe, is made with an annular groove 8 for receiving an annular sealing element 6 and a sleeve 7 in it with the possibility of its interaction with the outer surface of the pipe 9 and the sealing element 6. Bronze is taken as a plastic material , copper or brass, providing a tight seal at pressures up to 70 MPa. The height of the sleeve 7 is selected from the ratio of H 2x xA + 15 mm, where H is the axial dimension of the sleeve of plastic material, mm; D is the maximum clearance between the pipe 9 and the end face of the sleeve 7.

The sealing element 6 is made of rubber. The dimensions of the elements 6 are selected from the ratio h A + 3 mm, where h is the axial dimension of the annular sealing element, mm.

The device is secured to the drill pipe 9 by means of clamps 10 having union nuts 11.

The device operates as follows.

In order to install the connecting pipe 1 to the drill pipe 9, the complete assembly is fastened with clamping clips 10 to the drill pipe 9 (see Fig. 1) in the intended place. With such an installation, the sleeve 7 contacts the drill pipe 9 at two points K (see Fig. 2). To tighten the installation of the connecting pipe 1, the tightening nuts 11 are started to be tightened. As a result, the nuts 11 exert a force on the plate 2, and through it on the figured flange 4. The flange 4 transfers a force action to the annular sealing element 6, compressing it. When the element 6 is compressed, pressure develops in it, which is transmitted to the inner end of the sleeve 7 of plastic material. Under the action of this force, the sleeve 7, resting with at two opposite points K, begins to bend until its outer end abuts against the outer surface of the pipe 9. Tightening further than the nut 11 creates the force of pressing the sleeve 7 against the pipe 9 of the desired size. .to ensure the tightness of the contact surface of the sleeve 7 with the pipe 9 (see Fig. 3).

After that, a device for drilling pipe 9 under pressure is connected to the connecting thread 5 and all the work is done related to the creation of a channel for circulation in the side wall of the pipe 9. After completing the operations of killing the well, the device is removed from the drill pipe 9, after having screwed nuts 11. Replace sleeve 7 and sealing element 6 with new ones, and the device is ready for use at the next site.

The use of the device allows, without carrying out hot work, to be connected to a pipeline under high overpressure. This ensures high reliability of the device. Especially effective is the use of the device when working at the wellhead with a gassed medium when it is impossible to use known devices.

Claims (1)

SUMMARY OF THE INVENTION A device for mounting a connecting pipe to a drill pipe, including a plate with an axial channel, in which a pipe is installed with a shaped flange at one end and a connecting thread at the other and an annular sealing element located inside the shaped flange, characterized in that in order to increase reliability of the device, it is equipped with a sleeve of plastic material, and the end face of the curly flange facing the drill pipe is made with an annular groove for placement in it condense ring of the element and the sleeve with the possibility of its interaction with the outer surface of the pipe, while the axial dimensions of the sleeve and the annular sealing element are determined from the ratios  + 15, h D + 3, where H is the axial size of the sleeve of plastic material, mm; h is the axial size of the annular sealing element, mm; And - the maximum gap between the pipe and the end face of the sleeve, mm Fig 2