SU1609940A1 - String of thermally insulated pipes - Google Patents

Abstract

The invention relates to devices for supplying coolant to the bottom of a well and can be used in the operation of wells and the extraction of viscous minerals. The purpose of the invention is to increase reliability and tightness. The column includes sections of concentrically arranged external pipes 1, connected by threads 2 with a sleeve 11, and internal pipes 3, which are fixed to one another at one end and sealed with a diaphragm 4, and from the other there is a sleeve 5 with a sealing ring 6. Between the sections of internal pipes are installed coupling 7 with sealing inserts 8. Rings 6 and inserts 8 are made of a material with a coefficient of linear thermal expansion greater than pipes 1 and 3. Behind diaphragm 4 there is a layer of heat insulator 9 and centralizer 10. The space between the couplings 11 and 7 is filled teplogermetikom 12. 1 yl.

Description

The invention relates to devices for supplying coolant to the bottom of a well and can be used in the operation of wells and the extraction of viscous minerals.

The purpose of the invention is the improvement of reliability and tightness at temperature differences,

The drawing shows the node of the column of insulated pipes, sealing the coupling connection.

The column includes sections of concentric external pipes with a thread 2 at the ends and internal pipes 3, which are fixed and sealed to each other with a welded diaphragm 4 at one end, and another sleeve 5 is installed with a sealing ring 6 between the other pipes. 3 a coupling 7 is installed with cylindrical sealing inserts 8, the coupling 7 being made of the same material as the pipes, and the sealing inserts 8 and the rings 6 are made of a material with a greater coefficient of linear thermal expansion than t pipes 1 and 3. Behind diaphragm 4 a layer of heat insulator 9 is placed, reducing the heat carrier energy loss, and a centralizer 10 that prevents breaking the heat insulator - iijiOHHoro layer 9 during assembly and operation of the column, the outer sections of pipes are connected by a threaded coupling 11. The space between the threaded coupling 11 and the sleeve 7 to reduce heat transfer is filled with heat seal 12.

When supplying the coolant to the column, at elevated temperatures and giving, the internal pipes 3 are primarily heated, couplings 7 with cylindrical sealed inserts 8 and sealing rings 6. Since inserts 8 and rings 6 are made of a material with a large linear expansion coefficient, then at the point of contact with the pipes

1 and 3, the contact pressure is created, which seals the annular space with the heat insulator 9 and the connection of the inner pipes. Since one end of the section is fixed and sealed by the welded diaphragm 4, due to the temperature difference between the outer 1 and inner 3 pipes there is a greater elongation of the inner pipe 3. The forces generated by the pipe 3 during elongation exceed the contact pressures created at the sealing sites, resulting in a smooth moving the inner tube 3 loss of tightness. Together with the pipe 3, a sealing ring 6 slides along the inner surface of the external pipe 1. The end of the internal pipe 3 moves along the sleeve 7 with inserts 8, and the contact area increases and the tightness of the connection increases.

Claims (1)

Invention Formula A column of thermally insulated pipes, including concentrically arranged sections of external pipes with a junction assembly and sections of internal pipes with a coupling between them, a diaphragm, hermetically fastening the external and internal sections, and heat insulating and shielding materials in the annular space between them, characterized in that To increase reliability and tightness, a volc with a sealing ring is installed at one end in the annular space of the pipe sections, and in the coupling from the ends of the inner surfaces there are germs Emulsifying inserts, the inserts and rings made of a material with a greater coefficient of linear thermal expansion than the material of the pipes.