CN205243433U - Novel directly link heat insulation oil pipe - Google Patents

Abstract

The utility model discloses a novel directly link heat insulation oil pipe, include outer tube and inner tube, interior sealing of tube sets up interior insulating layer in the inside of outer tube between outer tube and inner tube, and vacuum treatment is taken out to interior insulating layer, and is inside as an organic whole through welding ring and interior sealing of tube behind the outer tube one end tip internal upsetting, outside processing external screw thread of body and coupling one end female connection, and the other end intraduct of outer tube passes through sealing ring and interior sealing of tube an organic whole, the outside processing external screw thread of body and other heat insulation oil pipe coupling other ends female connection, the inner tube both ends are carried out the inner tube through the sealing ring and are directly linked conical surface sealing connection. The utility model discloses an adopt the inner tube directly to link sealing connecting structure, reduce the heat loss that the position is connected to the coupling to the sealed thermal -insulated effect of high leakproofness reinforcing is put forward in the realization.

Description

A New Type of Directly Connected Heat-Insulated Oil Pipe

technical field

The utility model relates to the technical field of heat-insulated oil pipes for thermal recovery wells in the petroleum industry, in particular to a novel direct-connected heat-insulated oil pipe, which is suitable for steam injection thermal recovery wells.

Background technique

my country's heavy oil resources are widely distributed, and heavy oil accounts for a considerable proportion of my country's oil production, and the production of heavy oil in various oil fields is also increasing year by year. Heavy oil is mainly exploited by thermal extraction, which can be divided into steam huff and puff extraction, steam flooding, and steam-assisted gravity flooding. Affected by high temperature, the casing damage of thermal recovery wells is very serious. At present, most domestic heavy oil thermal recovery oil fields use heat-insulated tubing. The heat-insulated oil pipe is composed of inner and outer layers of pipes. The outer pipe is connected to the inner pipe by welding. The inner and outer pipes are filled with heat-insulating gas to ensure that the heat of the hot steam is not easily lost. Now the most commonly used heat-insulated oil pipe in the well team is in the outer pipe. Coupling-type thread is processed on the top, and the heat-insulated oil pipe is connected through the coupling. However, the connection part of the coupling is a weak link in the heat-insulated tubing string of the thermal recovery well due to poor heat insulation effect, and accidents caused by problems in this part are not uncommon in field use.

In oilfield operations, corrosive media such as hydrogen sulfide, sulfate-reducing bacteria, chemical drive fluid, three-non-composite drive fluid, high-temperature oxygen, carbon dioxide, and chloride ions often exist in the insulated tubing string. Conventional insulated tubing is not resistant Corrosion function. Under the long-term working condition of the heat-insulated oil pipe, the weld seam, the inner wall of the inner pipe and the outer wall of the outer pipe are easily corroded by corrosive media, resulting in cracking of the weld seam, corrosion of the inner and outer pipes, and the loss of thermal insulation of the heat-insulated oil pipe. The above problems are urgently to be solved in the field of heavy oil thermal recovery.

Contents of the invention

The purpose of this utility model is to aim at the connection part of the coupling existing in the prior art, which is a weak link in the heat insulation oil pipe string of the thermal recovery well due to poor heat insulation effect, and causes problems in this part during field use. Accidents are not uncommon, and a new type of direct-connected heat-insulated oil pipe is provided.

In order to achieve the purpose of this utility model, this utility model provides a new type of direct connection heat insulation oil pipe, including an outer pipe 1 and an inner pipe 3, the inner pipe 3 is welded inside the outer pipe 1, between the outer pipe 1 and the inner pipe 3 The inner heat insulation layer 2 is set, and the inner heat insulation layer 2 is vacuumized. After the inner part of the outer pipe 1 is thickened, the inner part is welded with the inner pipe 3 through the welding ring 5. Threaded connection, the other end of the outer pipe 1 is welded with the inner pipe 3 through the sealing ring 6, and the outer thread of the pipe body is connected with the inner thread at the other end of the other end of the heat-insulating oil pipe coupling 4; the two ends of the inner pipe 3 pass through the sealing ring 6. Carry out the direct connection of the inner pipe to the tapered sealing connection.

Wherein, the inner wall of the inner pipe 3, the outer wall of the outer pipe 1, the internal thread, the external thread and their connections are all sprayed with anti-corrosion and wear-resistant coatings.

Wherein, the outer diameter of the inner tube 3 and the inner diameter of the sealing ring 6 for the direct connection of the inner tube to the tapered sealing connection adopt a tapered surface interference fit.

Wherein, after the inner diameter of one end of the outer pipe 1 is thickened and thickened, the inner diameter here is smaller than the inner diameter of other parts of the pipe body, and the outer diameter here is machined with external threads.

Wherein, the internal thread and the external thread are tapered threads with a taper of 0.0625-0.125.

Compared with the prior art, the beneficial effect of the utility model is: the heat-insulated oil pipe adopts the direct-connected seal connection structure of the inner pipe to reduce the heat loss at the connection part of the collar, so as to improve the sealing performance and enhance the heat insulation At the same time, the inner wall of the inner pipe, the outer wall of the outer pipe, the outer thread, the inner thread and their joints are sprayed with anti-corrosion and wear-resistant coatings, so it has the function of reducing the corrosion in the entire heat-insulated oil pipe string, prolonging the service life of the product and improving steam injection. The effect of oil recovery.

Description of drawings

Shown in Fig. 1 is the structural representation of the utility model;

In the figure: 1. Outer pipe, 2. Inner insulation layer, 3. Inner pipe, 4. Coupling, 5. Welding ring, 6. Sealing ring.

detailed description

Below in conjunction with accompanying drawing and specific embodiment the utility model is described in further detail. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

It should be noted that the "connection" mentioned in this application and the words used to express "connection", such as "connected", "connected", etc., include not only a direct connection between a certain component and another component, but also a certain One part is connected to another part through other parts.

As shown in Figure 1, the utility model provides a new direct-connected heat-insulated oil pipe, including an outer pipe 1 and an inner pipe 3, the inner pipe 3 is welded inside the outer pipe 1, and an inner pipe is set between the outer pipe 1 and the inner pipe 3. The heat insulation layer 2 and the inner heat insulation layer 2 are evacuated. The outer pipe 1 is thickened at one end and welded with the inner pipe 3 through the welding ring 5. The external thread of the pipe body is connected with the internal thread of the coupling 4. , the other end of the outer pipe 1 is welded together with the inner pipe 3 through the sealing ring 6, and the outer thread of the pipe body is connected with the inner thread at the other end of the other heat-insulating oil pipe coupling 4; The inner tube is directly connected to the tapered sealing connection.

It should be noted that the above-mentioned "both ends of the inner pipe 3 are directly connected to the tapered surface of the inner pipe through the sealing ring 6" means that when two heat-insulated oil pipes are connected, the inner pipes of the two heat-insulated oil pipes are connected to each other. The connecting end is sealed and connected through the sealing ring 6 for direct connection of the inner pipe to the conical surface.

Because the utility model adopts the direct-connected and sealed connection structure of the inner pipe, the heat loss at the connection part of the collar is greatly reduced, the sealing performance is improved, and the sealing and heat insulation effect is enhanced.

Wherein, the inner wall of the inner pipe 3, the outer wall of the outer pipe 1, the internal thread, the external thread and their connections are all sprayed with anti-corrosion and wear-resistant coatings. The utility model realizes the reduction of corrosion in the entire heat-insulating oil pipe column, prolongs the service life of the product, and improves the effect of steam injection and oil recovery;

Wherein, the outer diameter of the inner tube 3 and the inner diameter of the sealing ring 6 for the direct connection of the inner tube to the tapered sealing connection adopt a tapered surface interference fit.

Wherein, after the inner diameter of one end of the outer pipe 1 is thickened and thickened, the inner diameter here is smaller than the inner diameter of other parts of the pipe body, and the outer diameter here is machined with external threads.

Wherein, the internal thread and the external thread are tapered threads with a taper of 0.0625-0.125.

The above is only a preferred embodiment of the utility model, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the utility model, some improvements and modifications can also be made, these Improvement and retouching should also be regarded as the protection scope of the present utility model.

Claims (5)

1. a novel direct-connected insulated tubing, is characterized in that, comprises outer tube (1) and inner tube (3), inner tube(3) be welded on the inside of outer tube (1), between outer tube (1) and inner tube (3), inner insulating layer (2) be set,Inner insulating layer (2) vacuumizes processing, inner by welding ring (5) after thickening in outer tube (1) end, one endBe welded as a whole with inner tube (3), body external process external screw thread is connected with box cupling (4) one end internal thread,The other end pipe of outer tube (1) is inner welded by sealing ring (6) and inner tube (3), and body outside addsWork external screw thread is connected with other insulated tube coupling (4) other end internal thread; Inner tube (3) two ends are by closeSeal ring (6) is carried out the direct-connected conical surface seal of inner tube and is connected.

2. the novel direct-connected insulated tubing of one according to claim 1, is characterized in that described inner tube(3) inwall, outer tube (1) outer wall, internal thread, external screw thread and junction thereof are all coated with anticorrosion antiwear paintingLayer.

3. the novel direct-connected insulated tubing of one according to claim 1, is characterized in that, described in carry outInner tube (3) external diameter that the direct-connected conical surface seal of inner tube connects adopts adopting conical surface interference to coordinate with sealing ring (6) internal diameter.

4. the novel direct-connected insulated tubing of one according to claim 1, is characterized in that described outer tube(1) after the thick interior thickening of the inner end diameter pier of one end, internal diameter is less than other position internal diameter of body herein, and at thisPlace's external diameter threading.

5. according to the novel direct-connected insulated tubing of the one described in any one in claim 1-4, it is characterized in that,Described internal thread and external screw thread are tapered screw thread, and tapering is 0.0625-0.125.