CN216381247U

CN216381247U - Special thread heat-insulating oil pipe with gapless butt joint outer pipe

Info

Publication number: CN216381247U
Application number: CN202122986065.6U
Authority: CN
Inventors: 周振强; 张春生; 刘振森
Original assignee: Panjin Liaohe Oil Field Jinhuan Industry Co ltd
Current assignee: Panjin Liaohe Oil Field Jinhuan Industry Co ltd
Priority date: 2021-12-01
Filing date: 2021-12-01
Publication date: 2022-04-26
Anticipated expiration: 2031-12-01

Abstract

The utility model discloses a special thread heat-insulation oil pipe with an outer pipe in gapless butt joint, which comprises an outer pipe, an inner pipe and a heat-insulation layer, wherein an internal thread is processed after one end of the outer pipe is thickened, and an external thread is processed at the other end of the outer pipe; the outer surface of the internal thread is provided with a layer of rubber coating, and the thickness of the rubber coating is 0.5mm-0.80 mm; and after the internal thread and the external thread are screwed, the compressed thickness of the rubber coating is 0.10mm-0.30 mm. The utility model adopts the connection form of coupling-free direct connection and gapless butt joint, changes the connection form of the traditional heat-insulating oil pipe processing coupling type thread, changes the production process of the heat-insulating oil pipe, improves the processing efficiency and saves the processing cost; the circular arc threads are adopted, the elastic rubber is additionally used for assisting sealing, the processing difficulty is greatly reduced while the sealing performance is enhanced, and the purposes of cost reduction and efficiency improvement are achieved.

Description

Special thread heat-insulating oil pipe with gapless butt joint outer pipe

Technical Field

The utility model relates to the technical field of petroleum thick oil thermal recovery pipes, in particular to a special threaded heat-insulating oil pipe with an outer pipe in gapless butt joint.

Background

At present, most of the heavy oil thermal recovery oil fields in China use heat insulation oil pipes. The heat insulation oil pipe consists of an inner pipe and an outer pipe, the outer pipe is welded with the inner pipe, heat insulation gas is filled between the inner pipe and the outer pipe, heat of hot steam is guaranteed not to be easily dissipated, a coupling type thread is machined on the outer pipe of the traditional heat insulation oil pipe, and the heat insulation oil pipe is connected through a coupling. The connecting part of the coupling is usually provided with a lining which has the function of compensating the heat insulation effect of the middle part of the coupling, but the problem of poor control of the assembling size exists, meanwhile, the coupling type product belongs to a weak link in a heat insulation oil pipe column of a thermal production well, and accidents caused by problems at the connecting part are frequently seen in field use. The heat insulation pipe with the coupling is also found to be not ideal in heat insulation effect during use.

SUMMERY OF THE UTILITY MODEL

In order to solve the related technical problems, the application aims to provide a special threaded heat-insulating oil pipe with an outer pipe in gapless butt joint.

In order to achieve the purpose of the application, the technical scheme provided by the application is as follows:

a special thread heat insulation oil pipe with an outer pipe in gapless butt joint comprises the outer pipe, an inner pipe and a heat insulation layer, wherein an internal thread is processed after one end of the outer pipe is thickened, and an external thread is processed at the other end of the outer pipe;

the outer surface of the internal thread is provided with a layer of rubber coating, and the thickness of the rubber coating is 0.5mm-0.80 mm;

and after the internal thread and the external thread are screwed, the compressed thickness of the rubber coating is 0.10mm-0.30 mm.

The outer pipe is provided with a triangular mark on the outer surface of one end of the external thread, and the distance between the triangular mark and the end face is 114.3mm +/-3.75 mm.

Wherein, the rubber coating material is polytetrafluoroethylene.

The internal thread is a conical thread, the thread pitch is 4.233mm, the tooth height is 1.81mm, and the tooth-shaped arc is 1.5 mm.

The external thread is a conical thread, the thread pitch is 4.233mm, the tooth height is 1.92mm, and the tooth-shaped arc is 0.75 mm.

Compared with the prior art, the utility model has the beneficial effects that:

1. the connection form of coupling-free direct connection and gapless butt joint is adopted, the connection form of the conventional machining coupling type thread of the heat-insulating oil pipe is changed, the production process of the heat-insulating oil pipe is changed, the machining efficiency is improved, and the machining cost is saved;

2. 2 threaded connection points are reduced by removing the coupling component, so that the potential failure danger of the product can be greatly reduced;

3. the arc threads are adopted, the elastic rubber is added for auxiliary sealing, the sealing performance is enhanced, the processing difficulty is greatly reduced, and the purposes of cost reduction and efficiency improvement are achieved;

4. the method is particularly suitable for working environments under complex well conditions such as deep wells, horizontal wells and the like, and is convenient to popularize and apply in industry.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of the internal and external thread engagement structure of the present invention;

FIG. 3 is a schematic view of the internal thread configuration of the present invention;

FIG. 4 is a schematic view of the external thread profile of the present invention;

FIG. 5 is a schematic view of the internal thread profile of the present invention;

in the figure: 1. the heat insulation pipe comprises an outer pipe, a heat insulation layer 2, an inner pipe 3, an outer thread 4, an inner thread 5, a triangular mark 6, a rubber coating 7, t 1-compression thickness, t-thickness, delta L-end face distance P-inner thread pitch, H-inner thread tooth height, R-inner thread tooth type circular arc, P1-outer thread pitch, H-outer thread tooth height and R-outer thread tooth type circular arc.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.

The utility model is described in further detail below with reference to the figures and specific examples. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when used in this specification the singular forms "a", "an" and/or "the" include "specify the presence of stated features, steps, operations, elements, or modules, components, and/or combinations thereof, unless the context clearly indicates otherwise.

As used herein, the singular forms "a," "an," "the," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It will be understood that when an element is referred to herein as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

As shown in fig. 1-5, the present embodiment provides a special threaded heat-insulated oil pipe with an outer pipe in gapless butt joint, comprising an outer pipe 1, an inner pipe 3 and a heat-insulating layer 2,

processing an internal thread 5 after thickening one end of the outer pipe 1, and processing an external thread 4 at the other end;

the outer surface of the internal thread 5 is provided with a layer of rubber coating 7, and the thickness t of the rubber coating is 0.5mm-0.80 mm;

after the internal thread 5 is screwed with the external thread 4, the compressed thickness t1 of the rubber coating 7 is 0.10mm-0.30 mm.

This application adopts the connection form that no coupling directly links zero clearance butt joint, has changed the connection form of traditional thermal-insulated oil pipe processing coupling formula screw thread, has changed thermal-insulated oil pipe's production technology, has improved machining efficiency, has practiced thrift the processing cost.

In a preferred embodiment, the outer tube 1 is provided with a triangular mark 6 on the outer surface of one end of the external thread 4, and the distance Δ L between the triangular mark and the end face is 114.3mm ± 3.75 mm. With this structure, the efficiency of installation can be improved.

In a preferred embodiment, the rubber coating 7 is made of polytetrafluoroethylene.

In a preferred embodiment, the internal thread 5 is a conical thread, and has a pitch P of 4.233mm, a tooth height H of 1.81mm, and a profile arc R of 1.5 mm. The external thread 4 is a conical thread, the thread pitch P1 is 4.233mm, the tooth height h is 1.92mm, and the tooth-shaped circular arc r is 0.75 mm.

This application adopts the circular arc screw thread and adds the supplementary sealed of elastic rubber, and when the leakproofness obtains the reinforcing, the processing degree of difficulty greatly reduced reaches cost reduction increase purpose.

The technical means not described in detail in the present application are known techniques.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. A special thread heat insulation oil pipe with an outer pipe in gapless butt joint comprises an outer pipe (1), an inner pipe (3) and a heat insulation layer (2), and is characterized in that,

one end of the outer pipe (1) is thickened and then is processed with an internal thread (5), and the other end is processed with an external thread (4);

the outer surface of the internal thread (5) is provided with a layer of rubber coating (7), and the thickness (t) of the rubber coating is 0.5-0.80 mm;

and after the internal thread (5) and the external thread (4) are screwed together, the compressed thickness (t1) of the rubber coating (7) is 0.10-0.30 mm.

2. The outer pipe gapless butt joint special threaded heat insulation oil pipe according to claim 1, characterized in that the outer surface of one end of the outer thread (4) of the outer pipe (1) is provided with a triangular mark (6) which is 114.3mm plus or minus 3.75mm away from the end face.

3. The special threaded heat-insulating oil pipe with the outer pipe in gapless butt joint according to claim 1, characterized in that the rubber coating (7) is made of polytetrafluoroethylene.

4. The special thread heat insulation oil pipe without the gap between the outer pipes as claimed in claim 1, wherein the internal thread (5) is a conical thread, the pitch (P) is 4.233mm, the tooth height (H) is 1.81mm, and the tooth-shaped arc (R) is 1.5 mm.

5. The outer pipe gapless butt joint special thread heat insulation oil pipe according to claim 1, wherein the external thread (4) is a conical thread, the thread pitch (P1) is 4.233mm, the tooth height (h) is 1.92mm, and the tooth-shaped circular arc (r) is 0.75 mm.