CN113027350A

CN113027350A - Heat-point-free heat insulation oil pipe column structure

Info

Publication number: CN113027350A
Application number: CN202110505946.3A
Authority: CN
Inventors: 刘全刚; 丁英杰; 柳沣洵; 曹景强; 董世超; 刘志龙; 高山
Original assignee: Zibo Furuite Thermal Energy Technology Co ltd; Engineering Technology Branch of CNOOC Energy Technology and Services Ltd
Current assignee: Zibo Furuite Thermal Energy Technology Co ltd; Engineering Technology Branch of CNOOC Energy Technology and Services Ltd
Priority date: 2021-05-10
Filing date: 2021-05-10
Publication date: 2021-06-25

Abstract

The invention provides a heat-point-free heat-insulation oil pipe column structure. The double-stage threads processed on the inner pipe and the outer pipe in the technical scheme have good air tightness; the design of the two-stage threads reduces the wall thickness of the outer pipe at the overlapped section of the coupling and the pipe body on the premise of ensuring the connection strength of the threads, the pipe end of the outer pipe of the pipe body adopts an inner thickening design, the outer diameter of the pipe end of the pipe body is reduced, and enough space is reserved for the aerogel heat insulation coupling to be used as a heat insulation part; due to the design that the two-stage threads are simultaneously connected with the inner pipe body and the outer pipe body, the axial tension of the welded junction caused by the stress change of the inner pipe and the outer pipe due to the difference of well conditions and steam injection temperatures is reduced while the threaded connection strength is ensured, the safety of the welded junction is improved, and the service life of the welded junction is prolonged; the best design of the coupling heat insulation effect is achieved by selecting the aerogel heat insulation coupling; the integral pipe column is provided with vacuum or aerogel heat insulation treatment in the radial direction, so that the integral pipe column has no direct heat dissipation point and has a heat insulation structure of the whole pipe column. This design is suitable for the full size design of thermal insulating oil casings.

Description

Heat-point-free heat insulation oil pipe column structure

Technical Field

The invention relates to the technical field of petroleum machinery, in particular to a heat-point-free heat insulation oil pipe column structure.

Background

In the oil production technology, the heat insulation oil pipe is one of necessary downhole tools for steam injection production. Because the steam of notes vapour can take place the heat exchange at the injection in-process, consequently can lead to steam temperature to reduce, cause heat loss, be difficult to satisfy the exploitation demand. The heat insulation oil pipe has a good heat insulation effect and can reduce the heat loss of the oil well. The insulated tubing is typically a double-layered concentric tubular structure with the annular space between the two layers filled with insulation, inert gas or vacuum. When the steam is injected to recover the thick oil, the heat insulation oil pipe is used, so that the heat loss can be reduced, and the steam dryness can be improved.

In the overall structure of the heat insulation oil pipe, the interface is a weak link influencing the heat insulation effect. In the prior art, the air tightness of the interface of the conventional heat insulation oil pipe is not good, and the design of the whole heat insulation structure is not reasonable enough, so that the heat insulation effect needs to be improved. In this situation, how to improve the thermal insulation effect of the insulated oil pipe through the improvement of the structural level becomes a technical problem to be solved in the field.

Disclosure of Invention

The invention aims to provide a heat-point-free heat insulation oil pipe column structure aiming at the technical defects of the prior art so as to solve the technical problems that the conventional heat insulation oil pipe is poor in air tightness and needs to be improved in heat insulation effect.

In order to realize the technical purpose, the invention adopts the following technical scheme:

the utility model provides a no hot spot heat insulation oil pipe tubular column structure, which comprises an outer tube, the inner tube, thermal-insulated cavity, the thermal-insulated coupling of aerogel, the thread sealing conical surface, the one-level screw thread, the second grade screw thread, interior outer pipe welding point, wherein, the outer tube is connected outside the inner tube through interior outer pipe welding point, thermal-insulated cavity has between outer tube and inner tube, outer tube and inner tube insert to the thermal-insulated coupling of aerogel in, through one-level screw thread fastening connection between inner tube and the thermal-insulated coupling of aerogel, through second grade screw thread fastening connection between outer tube and the thermal-insulated coupling of aerogel, be equipped with the thread sealing conical.

Preferably, the aerogel thermal insulation collar comprises a thermal insulation collar shell, a thermal insulation collar core body and a thermal insulation collar thermal insulation cavity, wherein the thermal insulation collar core body is positioned inside the thermal insulation collar shell, and the thermal insulation collar thermal insulation cavity is arranged between the thermal insulation collar core body and the thermal insulation collar shell.

Preferably, the heat insulating cavity is filled with a heat insulating material.

Preferably, the thread sealing taper is located at the end of the primary thread.

Preferably, the outer tube has an inner thickened structure at its end and the inner tube has an outer thickened structure at its end.

Preferably, a mutually-matched positioning end face (also called a screwing positioning end face) is arranged between the port of the aerogel heat insulation coupling and the outer pipe, and the aerogel heat insulation coupling and the outer pipe are mutually attached through the positioning end face.

In the above technical scheme, the outer pipe and the inner pipe are in a mutually nested structure, and an annular seam between the outer pipe and the inner pipe is welded and fixed, wherein the annular seam is the welding point of the inner pipe and the outer pipe. From this, outer tube and inner tube form overall structure, and rethread two-stage screw thread assembles with aerogel thermal-insulated coupling on this basis.

In the present invention, the term "hot spot-free" is used for describing and describing the structural features of the present invention, and particularly, for describing the present invention without obvious heat dissipation gaps, the term does not constitute a limitation on the technical features per se, and thus, the present invention is described herein.

The invention provides a heat-point-free heat-insulation oil pipe column structure. Including thermal-insulated oil pipe body and thermal-insulated coupling, wherein thermal-insulated oil pipe body includes oil pipe outer tube and oil pipe inner tube, and the outer tip has interior thickening structure, and interior tip has outer thickening structure, and the outer tube passes through welded connection outside at the inner tube body, is equipped with the body annular space between thermal-insulated oil pipe inner tube and the outer tube, guarantees the heat-proof quality of body through isolated thermal radiation, thermal convection and hot-conducting mode. Two heat-insulating oil pipes are connected into an integral pipe column through an aerogel heat-insulating coupling, and a heat-insulating oil pipe column structure without hot spots is formed. The connecting thread is a two-stage thread, the first-stage thread is machined on the inner pipe body, the second-stage thread is machined on the outer pipe body, and the end face of the first-stage thread is provided with a conical sealing surface and has air sealing capacity.

The invention creates double-stage threads processed on the inner pipe and the outer pipe, and the double-stage threads have good air tightness; the design of the two-stage threads reduces the wall thickness of the outer pipe at the overlapped section of the coupling and the pipe body on the premise of ensuring the connection strength of the threads, the pipe end of the outer pipe of the pipe body adopts an inner thickening design, the outer diameter of the pipe end of the pipe body is reduced, and enough space is reserved for the aerogel heat insulation coupling to be used as a heat insulation part; due to the design that the two-stage threads are simultaneously connected with the inner pipe body and the outer pipe body, the axial tension of the welded junction caused by the stress change of the inner pipe and the outer pipe due to the difference of well conditions and steam injection temperatures is reduced while the threaded connection strength is ensured, the safety of the welded junction is improved, and the service life of the welded junction is prolonged; the best design of the coupling heat insulation effect is achieved by selecting the aerogel heat insulation coupling; the integral pipe column is provided with vacuum or aerogel heat insulation treatment in the radial direction, so that the integral pipe column has no direct heat dissipation point and has a heat insulation structure of the whole pipe column. This design is suitable for the full size design of thermal insulating oil casings.

Drawings

FIG. 1 is a longitudinal sectional view of the invention;

in the figure:

1. outer tube 2, inner tube 3, thermal-insulated cavity 4, thermal-insulated coupling shell

5. Heat insulation coupling core body 6, heat insulation cavity 7 of heat insulation coupling, thread sealing conical surface 8 and first-level thread

9. Second grade screw thread 10, location terminal surface 11, interior outer tube welding point.

Detailed Description

The following detailed description of the embodiments of the present invention will be described. Well-known structures or functions may not be described in detail in the following embodiments in order to avoid unnecessarily obscuring the details. Approximating language, as used herein in the following examples, may be applied to identify quantitative representations that could permissibly vary in number without resulting in a change in the basic function. Unless defined otherwise, technical and scientific terms used in the following examples have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

Example 1

The utility model provides a no hot spot heat insulation oil pipe tubular column structure, as shown in figure 1, including outer tube 1, inner tube 2, thermal-insulated cavity 3, the thermal-insulated coupling of aerogel, thread sealing conical surface 7, one-level screw thread 8, second grade screw thread 9, interior outer tube welding point 11, wherein, outer tube 1 connects outside inner tube 2 through interior outer tube welding point 11, thermal-insulated cavity 3 has between outer tube 1 and inner tube 2, outer tube 1 and inner tube 2 insert to the thermal-insulated coupling of aerogel in, through one-level screw thread 8 fastening connection between inner tube 2 and the thermal-insulated coupling of aerogel, through second grade screw thread 9 fastening connection between outer tube 1 and the thermal-insulated coupling of aerogel, be equipped with thread sealing conical surface 7 between the port of inner tube 2 and the.

Example 2

Wherein, aerogel insulation collar includes thermal-insulated coupling shell 4, thermal-insulated coupling core 5, and thermal-insulated coupling heat-insulating chamber 6, and wherein, thermal-insulated coupling core 5 is located thermal-insulated coupling shell 4 inside, has thermal-insulated coupling heat-insulating chamber 6 between thermal-insulated coupling core 5 and thermal-insulated coupling shell 4. The heat insulating cavity 3 is filled with a heat insulating material. The thread sealing taper 7 is located at the end of the primary thread 8. The outer tube 1 has an inner thickened structure at its end and the inner tube 2 has an outer thickened structure at its end. Have between the port of aerogel thermal-insulated coupling and outer tube 1 and mutually support location terminal surface 10, aerogel thermal-insulated coupling and outer tube 1 are laminated each other through this location terminal surface 10.

The embodiments of the present invention have been described in detail, but the description is only for the purpose of describing the preferred embodiments of the present invention and is not intended to limit the present invention. Any modification, equivalent replacement, and improvement made within the scope of the application of the present invention shall be included in the protection scope of the present invention.

Claims

1. The utility model provides a no hot spot heat insulation oil pipe tubular column structure, a serial communication port includes outer tube (1), inner tube (2), thermal-insulated cavity (3), the thermal-insulated coupling of aerogel, thread sealing conical surface (7), one-level screw thread (8), second grade screw thread (9), interior outer tube welding point (11), wherein, outer tube (1) is connected in inner tube (2) outside through interior outer tube welding point (11), thermal-insulated cavity (3) have between outer tube (1) and inner tube (2), outer tube (1) and inner tube (2) insert to the thermal-insulated coupling of aerogel in, through one-level screw thread (8) fastening connection between inner tube (2) and the thermal-insulated coupling of aerogel, through second grade screw thread (9) fastening connection between outer tube (1) and the thermal-insulated coupling of aerogel, be equipped with thread sealing conical surface (7) between the port of inner tube (2).

2. The athermal insulation tubing string structure according to claim 1, wherein the aerogel insulation collar comprises an insulation collar housing (4), an insulation collar core (5), and an insulation collar insulation cavity (6), wherein the insulation collar core (5) is located inside the insulation collar housing (4), and the insulation collar insulation cavity (6) is located between the insulation collar core (5) and the insulation collar housing (4).

3. The structure of thermal point-free insulated tubing string as claimed in claim 1, wherein the insulating cavity (3) is filled with an insulating material.

4. The athermal insulation tubing string configuration of claim 1, wherein the thread sealing taper (7) is located at the end of the primary thread (8).

5. The athermal insulation tubing string structure of claim 1, wherein there is an inner thickening at the end of the outer tube (1) and an outer thickening at the end of the inner tube (2).

6. The structure of the thermal point-free thermal insulation tubing string as claimed in claim 1, wherein a positioning end face (10) is provided between the port of the aerogel thermal insulation collar and the outer tube (1), and the aerogel thermal insulation collar and the outer tube (1) are attached to each other through the positioning end face (10).