Special steel pipe with auxiliary heating structure for oil well

Abstract

The utility model relates to the technical field of steel pipes for oil wells, and discloses a special steel pipe with an auxiliary heating structure for an oil well, which comprises an oil transportation steel pipe and a connecting flange, a laying groove is arranged in the oil transportation steel pipe, a heat tracing cable is laid in the laying groove, the heat tracing cable comprises a sheath layer, an inner core is arranged in the sheath layer, and the inner core is arranged in the inner core. According to the oil transportation steel pipe, the multiple sets of laying grooves are formed in the oil transportation steel pipe, heat tracing cables for auxiliary heating of oil can directly penetrate through the laying grooves to be laid in the laying grooves, and the peripheries of the heat tracing cables are in butt joint with the inner sides of the laying grooves through the heat conduction rings; the periphery of the heat conduction ring is connected with the heat conduction rod penetrating through the inner side of the oil conveying steel pipe, when the heat tracing cable starts auxiliary heating, the heat tracing cable can be matched with the heat conduction ring and the heat conduction rod to conduct auxiliary heating on the oil conveying steel pipe and the stock solution, and therefore the heat tracing cable can be prevented from being corroded and damaged while the activity of the stock solution is guaranteed; therefore, the service life of the heat tracing cable is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of steel pipes for oil wells, in particular to a special steel pipe for oil wells with an auxiliary heating structure. Background Art

[0002] When existing oil well steel pipes are used to transport oil, auxiliary heating cables are added inside the oil pipes. In low temperature weather, the auxiliary heating cables can convert electrical energy into thermal energy, thereby increasing the temperature of the oil fluid to reduce viscosity and increase fluidity. However, when the existing auxiliary heating cables are laid inside the steel pipes for a long time, the cables themselves are prone to corrosion and wear, which shortens the service life of the cables. For this reason, we propose a special steel pipe for oil wells with an auxiliary heating structure. Utility Model Content

[0003] The utility model mainly solves the technical problems existing in the above-mentioned prior art and provides a special steel pipe for oil wells with an auxiliary heating structure.

[0004] In order to achieve the above-mentioned purpose, the utility model adopts the following technical solution: a special steel pipe for oil wells with an auxiliary heating structure, comprising an oil delivery steel pipe and a connecting flange, wherein the interior of the oil delivery steel pipe is provided with laying grooves circumferentially arranged along the central axis of the oil delivery steel pipe, and auxiliary heating heating cables are laid inside the laying grooves, and the heating cables include a sheath layer, an inner core is arranged inside the sheath layer, and the interior of the sheath layer is filled with an insulating layer that wraps the inner core.

[0005] Preferably, a connecting groove penetrating the laying groove is provided on the inner side of the oil delivery steel pipe, and a heat conducting ring for conducting heat with the inner side of the laying groove is provided on the outer side of the heat conducting ring, and a heat conducting rod penetrating the connecting groove is installed on the outer periphery of the heat conducting ring;

[0006] Furthermore, the periphery of the heat conducting rod is in a sealed connection with the inner side of the communicating groove via a sealing layer.

[0007] Preferably, the outer cover of the sheath layer is provided with an anti-corrosion layer, the outer cover of the anti-corrosion layer is provided with a wear-resistant layer, the outer cover of the anti-corrosion layer is provided with a supporting spring for supporting the wear-resistant layer, and the interior of the wear-resistant layer is filled with an elastic layer that is wrapped and in contact with the supporting spring.

[0008] Preferably, the support spring and the elastic layer themselves have deformation characteristics, the outer side of the support spring is connected to the inner side of the wear-resistant layer and the inner side of the support spring is connected to the outer side of the anti-corrosion layer;

[0009] Furthermore, when the outer periphery of the wear-resistant layer is squeezed, the supporting spring and the elastic layer are in a deformation buffering state.

[0010] Beneficial effects

[0011] The utility model provides a special steel pipe for oil wells with an auxiliary heating structure. It has the following beneficial effects:

[0012] (1) A special steel pipe for oil wells with an auxiliary heating structure. In this article, multiple groups of laying grooves are opened inside the oil pipeline steel pipe, and the heating cables for auxiliary heating of the oil can be directly laid inside the laying grooves, and the outer periphery of the heating cable is connected to the inner side of the laying groove through a heat-conducting ring. The outer periphery of the heat-conducting ring is connected to a heat-conducting rod that passes through the inner side of the oil pipeline steel pipe. When the heating cable starts auxiliary heating, the heating cable can cooperate with the heat-conducting ring and the heat-conducting rod to perform auxiliary heating on the oil pipeline steel pipe and the raw liquid. In this way, while ensuring the activity of the raw liquid, the heating cable itself can be prevented from being corroded and damaged, thereby achieving the effect of extending the service life of the heating cable itself.

[0013] (2) A special steel pipe for oil wells with an auxiliary heating structure, wherein the outer sheath of the heating cable is provided with an anti-corrosion layer, and the outer sheath of the anti-corrosion layer is provided with a wear-resistant layer, and the interior of the wear-resistant layer is provided with a supporting spring that is in contact with the outer support of the anti-corrosion layer, and the outer side of the supporting spring is in contact with the inner side of the wear-resistant layer, and the interior of the wear-resistant layer is filled with an elastic layer in contact with the supporting spring. When the outside of the heating cable is squeezed, the wear-resistant layer can first contact with the external squeezing force, and the wear-resistant layer can squeeze the elastic layer and the supporting spring under the force. The supporting spring and the elastic layer themselves have deformation characteristics. At this time, the external squeezing force can be supported and buffered by the deformation characteristics of the supporting spring and the elastic layer themselves, thereby achieving the effect of improving the protection of the heating cable itself. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are only exemplary, and those skilled in the art can derive other implementation drawings based on the provided drawings without inventive effort.

[0015] The structures, proportions, sizes, etc. illustrated in this specification are intended solely to complement the contents disclosed herein and to facilitate understanding and reading by persons familiar with the art. They are not intended to limit the conditions under which the present invention may be implemented and therefore have no substantive technical significance. Any structural modifications, changes in proportions, or adjustments in size, without affecting the efficacy and objectives of the present invention, shall remain within the scope of the technical contents disclosed herein.

[0016] Figure 1 This is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 For this utility model Figure 1A magnified view of middle A;

[0018] Figure 3 It is a partial schematic diagram of the heating cable of the present invention.

[0019] Legend:

[0020] 1. Oil pipeline; 2. Connecting flange; 3. Laying groove; 4. Connecting groove; 5. Heating cable; 6. Heat conducting ring; 7. Heat conducting rod; 8. Sealing layer; 9. Sheath layer; 10. Inner core; 11. Insulation layer; 12. Anti-corrosion layer; 13. Wear-resistant layer; 14. Support spring; 15. Elastic layer. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] Example: A special steel pipe for oil wells with auxiliary heating structure, such as Figure 1-Figure 3 As shown, it includes an oil delivery steel pipe 1 and a connecting flange 2. The interior of the oil delivery steel pipe 1 is provided with a laying groove 3 arranged circumferentially along the central axis of the oil delivery steel pipe 1. The inner side of the oil delivery steel pipe 1 is provided with a connecting groove 4 penetrating the laying groove 3. A heating cable 5 for auxiliary heating is laid inside the laying groove 3. The outer sheath of the heating cable 5 is provided with a heat-conducting ring 6 that conducts heat with the inner side of the laying groove 3. A heat-conducting rod 7 penetrating the connecting groove 4 is installed on the periphery of the heat-conducting ring 6. The periphery of the heat-conducting rod 7 is sealed and connected to the inner side of the connecting groove 4 through a sealing layer 8. The heating cable 5 includes a sheath layer 9. An inner core 10 is provided inside the sheath layer 9. The inner side of the sheath layer 9 is filled with The insulating layer 11 wrapped around the inner core 10, the outer side of the sheath layer 9 is provided with an anti-corrosion layer 12, the outer side of the anti-corrosion layer 12 is provided with a wear-resistant layer 13, the outer periphery of the anti-corrosion layer 12 is provided with a supporting spring 14 supporting the wear-resistant layer 13, the interior of the wear-resistant layer 13 is filled with an elastic layer 15 wrapped and in contact with the supporting spring 14, the supporting spring 14 and the elastic layer 15 themselves have deformation characteristics, the outer side of the supporting spring 14 is connected to the inner side support of the wear-resistant layer 13 and the inner side of the supporting spring 14 is connected to the outer support of the anti-corrosion layer 12. When the outer periphery of the wear-resistant layer 13 is squeezed, the supporting spring 14 and the elastic layer 15 are in a deformation buffer state.

[0023] The working principle of this utility model:

[0024] The interior of the oil pipeline 1 is provided with a plurality of laying grooves 3, and the heating cable 5 for auxiliary heating of the oil can be directly laid through the laying groove 3, and the outer periphery of the heating cable 5 is connected to the inner side of the laying groove 3 through the heat-conducting ring 6, and the outer periphery of the heat-conducting ring 6 is connected to the heat-conducting rod 7 that passes through the inner side of the oil pipeline 1. When the heating cable 5 starts auxiliary heating, the heating cable 5 can cooperate with the heat-conducting ring 6 and the heat-conducting rod 7 to auxiliary heat the oil pipeline 1 and the raw liquid. In this way, while ensuring the activity of the raw liquid, the heating cable 5 itself can be prevented from being corroded and damaged, thereby extending the service life of the heating cable 5 itself. When the outside of the heating cable 5 is squeezed, the wear-resistant layer 13 can first contact the external squeezing force, and the wear-resistant layer 13 can squeeze the elastic layer 15 and the supporting spring 14 under the force. The supporting spring 14 and the elastic layer 15 themselves have deformation characteristics. At this time, the external squeezing force can be supported and buffered by the deformation characteristics of the supporting spring 14 and the elastic layer 15 themselves.

[0025] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements are intended to fall within the scope of the present invention. The scope of protection claimed in this invention is defined by the appended claims and their equivalents.

Claims

1. A special steel pipe for oil wells with an auxiliary heating structure, comprising an oil delivery steel pipe (1) and a connecting flange (2), characterized in that: The interior of the oil delivery steel pipe (1) is provided with laying grooves (3) arranged circumferentially along the central axis of the oil delivery steel pipe (1), and a heating cable (5) for auxiliary heating is laid inside the laying grooves (3). The heating cable (5) includes a sheath layer (9), an inner core (10) is provided inside the sheath layer (9), and an insulating layer (11) is filled inside the sheath layer (9) to wrap the inner core (10).

2. The special steel pipe for oil wells with an auxiliary heating structure according to claim 1, characterized in that: The inner side of the oil delivery steel pipe (1) is provided with a connecting groove (4) penetrating the laying groove (3); the outer side of the heating cable (5) is provided with a heat conducting ring (6) for conducting heat with the inner side of the laying groove (3); and the outer periphery of the heat conducting ring (6) is provided with a heat conducting rod (7) penetrating the connecting groove (4).

3. The special steel pipe for oil wells with an auxiliary heating structure according to claim 2, characterized in that: The periphery of the heat-conducting rod (7) is in a sealed connection with the inner side of the communicating groove (4) via a sealing layer (8).

4. The special steel pipe for oil wells with an auxiliary heating structure according to claim 1, characterized in that: The outer cover of the sheath layer (9) is provided with an anti-corrosion layer (12), the outer cover of the anti-corrosion layer (12) is provided with a wear-resistant layer (13), the outer cover of the anti-corrosion layer (12) is provided with a supporting spring (14) supporting the wear-resistant layer (13), and the interior of the wear-resistant layer (13) is filled with an elastic layer (15) wrapped in contact with the supporting spring (14).

5. The special steel pipe for oil wells with an auxiliary heating structure according to claim 4, characterized in that: The supporting spring (14) and the elastic layer (15) themselves have deformation characteristics. The outer side of the supporting spring (14) is connected to the inner side of the wear-resistant layer (13) and the inner side of the supporting spring (14) is connected to the outer side of the anti-corrosion layer (12).

6. The special steel pipe for oil wells with an auxiliary heating structure according to claim 5, characterized in that: When the outer periphery of the wear-resistant layer (13) is squeezed, the supporting spring (14) and the elastic layer (15) are in a deformation buffering state.

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