SU1629463A1 - Device for coupling sections of casing string - Google Patents

Abstract

The invention relates to the drilling of oil and gas wells. The goal is to increase the reliability of the connection of the casing sections by combining the moment of their connection with the operation of the device. It includes a shank 1 with a deformable shell 2. The latter is deformed concentrically located in the annular chamber 3 of the explosive 12. The deformed shell takes the form of the inner surface of the socket 10 with the annular grooves 11, while securing the sections and sealing them. The initiation of the explosive is carried out by detonators 13 after they are switched with the power source 14. Switching is carried out using magnetic contacts 18 after they intersect the magnetic field of the magnetic inserts 17 located in the socket 10. This ensures reliable connection of the device sections. 2 Il. 15 (L Figure 1

Description

The invention relates to the drilling of oil and gas wells and can be used during the descent of casing strings by sections, as well as in general engineering, if necessary, to connect long tubular elements.

The aim of the invention is to improve the reliability of the connection of the casing sections by combining the moment of their docking with the operation of the device.

1 shows a device for connecting casing sections (the latter are not shown) at the moment of docking; Fig. 2 shows a part of the device after the docking.

The device consists of a shank 1 located in the lower part of the upper section of the casing. In the lower part of its outer surface there is a lightly deforming sheath 2, concentric with which the annular chamber 3 is located in the shank, consisting of a body 4, an upper stopper 5, a lower stopper 6 and a connecting sleeve 7. The tightness of the annular chamber is provided by gaskets 8 and conical threads 9. In the upper part of the lower section of the casing there is a bell 10c with annular grooves 11 on the inner surface. Shaping means 12 are placed in the annular chamber 3, for which an explosive is used. The drive unit of the device is made in the form of electric detonators 13 with power supply 14. Electrical detonators are spring-loaded with springs 15 relative to the shank and have safety inserts 1b at their ends, for example, of a low-melting material (Kuda alloy), which are located at the entrance n to an annular chamber 3 with explosive 12.

The means of fixing the moment of joining the socket and shank are made in the form of a magnetic insert 17 on the inner surface of the socket 10 and a magnet controlled contacts 18, which are mounted on the shank and connect the power supply 14 to the electric detonators 13. In the working position after docking the device are located in one transverse plane. All the elements forming the annular chamber are made of drillable diamagnetic material, for example

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aluminum measures. The easily deforming sheath is covered with a layer of 19 soft metal (for example, zinc), which is a seal at the joint. A series of holes 20 are drilled in the body of the socket 10 to displace the solution during deformation of the shell 2,

The device works as follows.

After lowering and cementing the lower section of the casing string into the well, lower the upper section. The descent is accompanied by periodic flushing through the holes 21. As the string descends, the temperature in the well increases, the shank heats up. When a certain temperature is reached, the safety inserts 16 melt and the electric detonators 13 under the action of the spring 15 are supplied to the jacks of the ring charge of the explosive 12, the molten substance of the inserts 16 enters the gap between the electric detonator holder 13 and the ring-shaped housing. At that moment, when the magnetic control contacts 18 cross the force field of the magnetic inserts 17, the electrical circuit closes, the voltage of the power supply source 14 ignites the electrical detonators 13 and initiates the charge of the explosive 12. The deformable shell 2 will deform along the profile annular grooves 11 of the inner part of the socket 10, and a clear signal will come to the surface about joining along drill pipes or a seismic communication line.

After the destruction of the shoe and docking, they proceed to cementing using a squeeze plug. When it comes to the sleeve 22, the plug cuts the pins 23 off and the sleeve 22 seals the grout holes 21.

The use of the proposed device allows to increase the reliability of joining and docking of columns in ultra-deep, curved wells and to receive a clear signal to the surface about joining, which does not depend on the extension of drilling and casing pipes, nor on the compressibility of the fluid, or on friction against the borehole walls, since the initiation explosive charge, i.e. the docking signal arises only when the magnetically controlled contacts of the magnetic field lines intersect.

Claims (1)

Invention Formula A device for connecting casing sections, comprising a socket mounted in the upper part of the lower section with annular grooves on the inner surface, a shank with a readily deformable shell on the outer surface and a concentrically arranged annular chamber with shaping means, located at the lower part of the upper section working position and means of fixing the moment of docking of the socket and the shank, characterized in that, in order to increase the reliability of the connection of sections by combining ment of docking with the actuation device as shaping tools use explosive actuator assembly shaping means in the operating position is designed as a power source with electric detonators, electrodetonators biased relative to the shank and have at the ends of the safety inserts located at the entrance to the annular chamber, and the fixing means are made in the form of a magnetic insert placed on the inner surface of the socket, 5 and magnetic contacts mounted on the shank and connecting the power source with electric detonators, with magnetic inserts and magnetocontrolled contacts in the working position of the device in the same transverse plane.