SU926224A1 - Heat insulated string - Google Patents

Description

(54) THERMAL INSULATED COLUMN

I

The invention relates to the field I of the oil and gas industry and can be used in other branches of the national economy in the isolation of pipelines for the transport of heat carriers.

A thermally insulated column, comprising sections of inner tubes with a joint and outer tubes with a heat insulating material interposed between the nicks, is a rigid joint. internal and external pipes at one end of the sections, a sliding joint in the form of a transfer sleeve, installed at the other end of the section of internal pipes, and a seal between them I.

The disadvantage of this design is the occurrence of temperature bridges when the column is heated and its temperature elongations, which significantly reduces its thermal insulation properties.

This is due to the fact that when heated, the increase in linear dimensions of the inner tubes is much larger than the less heated outer tubes. As a result, a gap is formed between the ends of the adjacent outer tubes and the joint becomes an open source of heat.

A thermally insulated column is also known, which includes sections of internal pipes with a NODE of a connection, sections of external pipes connected by sliding slides with the possibility of blocking a rigid connection of internal and external

10 pipes, a heat insulating material located in the annular space between the inner and outer pipes, and seals 2.

The lack of known design

15 is that it does not ensure reliable sealing of the air cavity between the casing and the E morning tube, especially if high pressures are of the order of 300 kgf / cm, which is significant

20 reduces the thermal insulation properties of the column.

In addition, the outer tubes have a rigid connection with the inner tubes, which leads to their destruction due to large temperature overvoltages during heating. Purpose. the invention is to reduce heat losses in the joints while ensuring the compensation of the difference in temperature lengthening of the outer and inner pipes. This goal is achieved by the fact that the sliding sleeve is made in a stepped mode, the smaller one of which is located in the inner cavity of the external pipes and is rigidly connected with it, and the sliding sleeve is located outside the external pipes, and the seals are located at both ends of the step coupling. The drawing shows a thermally insulated column in section. The thermally insulated column includes sections of inner pipes 1 with a joint - coupling 2, sections of outer pipes 3, stepped coupling 4, ring 5 on the inner pipe, ring 6 on the outer pipe, an annular, for example rubber stopper 7, end ring 8 on the stepped coupling, sealed For example, a rubber ring 9, a conic ring 1O, a seal 11, a shaped nut 12, a heat insulating material 13 and 14. The sections of the inner pipes 11 and the outer pipes 3 are rigidly connected to each other at one end by welding with a conical ring 10. The rings 5 and 6 welded to each other against the other, respectively, to the outer surface of the inner pipe 1 and the inner surface of the outer pipe 3, and between them there is an annular, for example rubber stopper 7: Between the sections of the inner pipes 1 and the outer pipes 3 in the area from the conical ring 10 to the rings 5 and 6 thermal insulating material 13 is placed, for example alternating layers of basalt canvas j and aluminum foil. On top of rings 5 and 6 there is a seal in the form of a heat insulating asbestos rubber ring 9, whose diameter is equal to the width of the annular space. The inside of the outer pipe 3 is screwed on the thread of the smaller steps of the coupling 4, to which the face ring 8 is welded so that the asbestos rubber ring 9 can be clamped, and the inner diameter of the end ring 8 is smaller than the outer diameter of the inner pipe 1. The other step of the coupling 4 is mounted on the adjacent section of the outer pipe 3 possibility of sliding on it. Clutch 4 overlaps the rigid connection of the inner and outer tubes. Between the sliding end of the stepped coupling 4 and the surface of the outer pipe 3 times / 1 the seal 1 of the heat-insulating asbestos-rubber-graphite material, which is clamped by the shaped nut 12, is screwed into the stepped coupling 4. In the space formed by the ends of the inner pipes 1 screwed by the coupling 2 and the stepped coupling 4 with seals 9 and 11, there is additionally placed a physical insulation material, for example, a basalt plate 14. The production and operation of a thermally insulated column is carried out as follows. A 1unus ring 10 is welded to the inner pipe section 1 outside the thread, the cone base K is: facing the thread, the inner diameter of the cone ring Yu is equal to the outer Diameter of the inner pipe 1, and its outer diameter is equal to the inner diameter of the outer pipe 3. At the other end Ring 5 is welded to the same section at the thread; e of the outer pipe 3 in the section corresponding to the ring on the inner pipe 1, ring 6 is welded. Then, the tube 1 from the conical ring 10 is wound into the inner tube to Slash or butt the layers of basalt canvas and aluminum foil and fix the outer layer of the canvas with anvodochnymi ba vdazhi. On the resulting insulated pipe 1 put on the outer pipe 3 so that the rings 5 and b are combined. Then the conical ring 10 is welded to the outer pipe and between rings 5 and 6 they install a rubber asbestos rubber plug 7. Over the rings 5 and 6 with the plug 7 they are installed asbestos rubber ring 9 and clamp it, screwed into the outer pipe 3 on the thread step coupling 4 with a thorium ring 8 welded to it. On this, the manufacture of sections of thermally insulated pipes ends. The finished thermally ventilated pipes are lowered into the well as conventional tubing by connecting to the well vr 2 well in the well column. At the same time, the space formed by the ends of the inner pipes 1 with the coupling 2 and the stepped coupling 4 is filled with heat insulating material 14, for example, a basalt slab, coiled into a ring. After connecting the sections of the thermally insulated pipes into the column, the gap between the outer pipe 3 and the stepped coupling

4 is filled with sealing material

11, which is clamped with a shaped nut

12.To better clamp the inner surface of the stepped clutch 4 has a groove with a protrusion.

When the heat transfer medium flows through the insulated column, the inner tubes 1 increase in size in the radial and axial directions, while the dimensions of the outer tubes 3 thermally insulated from the inner insulating material 13, 14, 7, 9 and llj remain practically unchanged. In this case, the swept sections of the outer tubes 3 move relative to each other due to the contact with the stepped coupling 4, and the clamping forces of the heat-sealing seals 9 and 11 remain constant in the axial direction and increase radially, which ensures reliable sealing of the inter-pipe thermoisolating space during the operation of the column .

When the temperature of the heat carriers of the bodies decreases, the inner pipes 1 and outer

the pipes 3 take the initial dimensions and the initial position, while the seals 7.9 and il retain the annulus seal due to clamping. At the same time, seals 7.9 and 11 eliminate the thermal circuit between the internal and external pipes, which improves the insulating properties of the column.

Technical and economic efficiency is to reduce the material

costs in the operation of wells due povpieni teploiziruktsyh qualities of the column.

Claims (2)

1. USSR author's certificate Mg 740932, cl. E 21 B 17/00, 1978 / 2. USSR author's certificate NO 646026, cl. E 21 V 17/00, 1976 (prototype).