Heat conduction sucker rod for assisting thickened oil recovery

Abstract

The utility model discloses a heat conduction sucker rod used for assisting thickened oil recovery, and relates to the technical field of thickened oil recovery, the heat conduction sucker rod comprises an outer pipe, a hollow sucker rod and a conversion layer, the hollow sucker rod is arranged in the outer pipe, the hollow sucker rod and the outer pipe form a heat storage annulus, the conversion layer is arranged in the heat storage annulus, and the conversion layer can absorb and release heat; the heat storage annulus is further provided with a heating mechanism. The thickened oil heating device is simple in structure, thickened oil is heated in two modes, the fluidity of the thickened oil can be guaranteed, the heating mode can be selected according to the cold degree of weather, and therefore energy consumption can be reduced, and the exploitation cost can be reduced; meanwhile, the heat release efficiency of the heating mechanism can be enhanced through the conversion layer, the thick oil is heated more sufficiently, and meanwhile heat accumulation of the heating mechanism is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of heavy oil mining, in particular to a heat-conducting pumping rod for assisting heavy oil mining. Background Art

[0002] Heavy oil extraction is a complex engineering process, in which the sucker rod plays a vital role. Heavy oil, due to its high viscosity and poor fluidity, poses additional challenges to extraction, transportation, and refining. In heavy oil wells, the sucker rod's primary function is to work with the pump to lift the underground heavy oil to the surface.

[0003] The sucker rod is a slender metal rod with one end connected to the pumping unit on the ground and the other end connected to the oil pump downhole. It transmits power through the reciprocating motion of the pumping unit to drive the oil pump to work, thereby sucking heavy oil from the bottom of the well to the ground. Due to the high viscosity of heavy oil, it is easily affected by cold and has poor fluidity.

[0004] Publication number: CN208934608U, discloses a hollow sucker rod for extracting geothermal heat, wherein the upper part of the upper joint of the hollow rod is provided with an upper sucker rod thread, and the lower part of the lower joint of the hollow rod is provided with a lower sucker rod thread, the upper sucker rod thread matches the lower sucker rod thread, and a through hole is provided inside the hollow rod body, an upper plug is installed at the upper end of the through hole, the upper plug is fixed in the through hole and keeps a seal therewith, so that the upper end of the through hole is blocked, and a lower plug is installed at the lower end of the through hole, the lower plug is fixed in the through hole and keeps a seal therewith, an injection hole is provided on the lower plug, and the injection hole is communicated with the through hole, and after superconducting liquid is injected into the through hole through the injection hole, the injection hole is sealed by a sealing mechanism so that the superconducting liquid in the through hole cannot leak out.

[0005] This prior art changes the hollow sucker rod into a solid sucker rod and cannot be used in a hollow sucker rod string.

[0006] Publication number: CN102322223A, discloses a geothermal superconducting heat transfer wax-clearing and anti-wax sucker rod. An inner tube is fixed inside the hollow sucker rod, and a double-layer vacuum cavity is formed inside the hollow sucker rod and between the hollow sucker rod and the inner tube. The double-layer vacuum cavity is connected, and superconducting liquid is filled between the hollow sucker rod and the inner tube.

[0007] This existing technology only uses superconducting liquid for heat transfer, and cannot perform active heating when the heat in the ground is insufficient.

[0008] Announcement No.: CN106014338B, discloses an oil wellbore power generation, electromagnetic viscosity reduction and anti-wax heating system, including a hollow rotor shaft, the hollow rotor shaft is provided with a generator rotor pole, the generator rotor poles are all connected to the generator rotor sliding sleeve, the outer side of the generator rotor sliding sleeve is sleeved with a generator stator housing and an outer tube of an electromagnetic viscosity reduction and anti-wax heating device, the generator stator housing is fixed with a generator stator core, the generator stator core is insulated and sealed with a generator stator winding, the generator stator winding is provided with a generator stator sliding sleeve, the generator stator winding is electrically connected to the electromagnetic viscosity reduction and anti-wax heating device coil, and the electromagnetic viscosity reduction and anti-wax heating device coil is insulated and arranged in a closed cavity.

[0009] The prior art has a low heat release efficiency, and the heating device coil may accumulate heat during use, forcing the power to be reduced.

[0010] In short, the technical solutions of the above-disclosed technologies, the technical problems to be solved and the beneficial effects produced are all different from those of the present utility model. Regarding the more technical features, technical problems to be solved and the beneficial effects of the present utility model, the above-disclosed technical documents do not provide any technical inspiration. Utility Model Content

[0011] In view of the above-mentioned defects in the prior art, the purpose of the present invention is to provide a heat-conducting sucker rod for assisting heavy oil production.

[0012] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0013] A heat-conducting sucker rod for assisting heavy oil production comprises an outer tube, a hollow sucker rod, and a conversion layer. The hollow sucker rod is arranged in the outer tube, and the hollow sucker rod and the outer tube form a heat storage annulus. The conversion layer is arranged in the heat storage annulus, and the conversion layer can absorb and release heat; the heat storage annulus is also provided with a heating mechanism.

[0014] Furthermore, a sealing sleeve 1 and a sealing sleeve 2 are sequentially arranged in the heat storage annulus, and a conversion layer is arranged between the sealing sleeve 1 and the sealing sleeve 2;

[0015] Specifically, the heating mechanism includes a first pressing cap, a second pressing cap, and a resistance wire;

[0016] Specifically, the first pressure cap and the second pressure cap are sequentially arranged in the heat storage annulus;

[0017] Specifically, the first and second pressure caps are located on the side of the second sealing sleeve facing away from the conversion layer;

[0018] Specifically, the resistance wire is arranged between the first pressure cap and the second pressure cap.

[0019] Furthermore, the conversion layer is a phase change material.

[0020] Furthermore, the resistance wire is located below the conversion layer.

[0021] Furthermore, the resistance wire is sleeved on the hollow sucker rod, the resistance wire does not contact the first and second pressure caps, the outer tube and the hollow sucker rod, and the resistance wire is potted with high temperature resistant glue.

[0022] Furthermore, the first pressing cap is in contact with the second sealing sleeve.

[0023] Furthermore, the second pressing cap is provided with an axial wire passing hole, a wire passing connector is provided in the wire passing hole, a wire is led out of the resistance wire, the wire is passed through the wire passing hole, and the wire is connected to the wire passing connector.

[0024] Furthermore, the inner diameter of the outer tube in the heat storage annulus is divided into a small diameter and a large diameter, the conversion layer is located at the small diameter, and the resistance wire is located at the large diameter.

[0025] Furthermore, a threaded ring is provided on the inner wall of the outer tube, the threaded ring is located in the heat storage annulus, and the threaded ring is on the side of the sealing sleeve facing away from the conversion layer;

[0026] Specifically, the inner hole of the thread ring is threadedly connected to the outer wall of the hollow sucker rod, and the thread ring can press the sealing sleeve;

[0027] Specifically, an inner pipe head is provided on the inner wall of the outer pipe, and the inner pipe head contacts the end of the hollow sucker rod close to the threaded ring.

[0028] Furthermore, a first heat-conducting layer is provided on the outer wall of the outer tube, and a second heat-conducting layer is provided on the inner wall of the outer tube in contact with the conversion layer.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] 1. The utility model transfers heat energy to the heavy oil by improving the heat conduction effect, making it easier to flow, thereby improving oil recovery efficiency.

[0031] 2. The utility model has a simple structure and heats the heavy oil in two ways, which not only ensures the fluidity of the heavy oil but also allows the heating method to be selected according to the coldness of the weather, thereby reducing energy consumption and lowering mining costs.

[0032] 3. The conversion layer of the present invention can enhance the heat release efficiency of the heating mechanism, heat the thick oil more fully, and avoid heat accumulation in the heating mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a schematic diagram of the external structure of a heat-conducting sucker rod for assisting heavy oil extraction in the utility model;

[0034] Figure 2 This is a schematic diagram of the internal structure of a heat-conducting sucker rod for assisting heavy oil extraction in the utility model;

[0035] Figure 3 yes Figure 2 Enlarged schematic diagram of point A in the middle.

[0036] In the figure: 1. Outer pipe; 2. Hollow sucker rod; 3. Conversion layer; 4. Sealing sleeve 1; 5. Sealing sleeve 2; 6. Heat conducting layer 1; 7. Heat conducting layer 2; 8. Pressing cap 1; 9. Pressing cap 2; 10. Resistance wire; 11. Threaded ring; 12. Inner pipe head; 13. Wire; 14. Wire connector. DETAILED DESCRIPTION

[0037] 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.

[0038] Example 1:

[0039] See also Figures 1 to 3 The utility model provides a heat-conducting sucker rod for assisting heavy oil production, comprising an outer tube 1, a hollow sucker rod 2, and a conversion layer 3. The hollow sucker rod 2 is arranged in the outer tube 1, and the hollow sucker rod 2 and the outer tube 1 form a heat storage annulus. A sealing sleeve 1 4 and a sealing sleeve 2 5 are sequentially arranged in the heat storage annulus. A conversion layer 3 is arranged between the sealing sleeve 1 4 and the sealing sleeve 2 5. The conversion layer 3 can absorb and release heat. A heating mechanism is provided on the side of the sealing sleeve 2 5 facing away from the conversion layer 3 in the heat storage annulus.

[0040] Among them, the sealing sleeve 1 4 is mounted on the hollow sucker rod 2, and the outer wall of the sealing sleeve 1 4 is in contact with the inner wall of the outer tube 1; the sealing sleeve 2 5 is mounted on the hollow sucker rod 2, and the outer wall of the sealing sleeve 2 5 is in contact with the inner wall of the outer tube 1; the conversion layer 3 is sealed by the sealing sleeve 1 4 and the sealing sleeve 2 5.

[0041] Furthermore, the conversion layer 3 is a phase change material (PCM), which changes from solid to liquid when heated and stores the absorbed heat. When the oil rod moves to a cooler area, the material will re-solidify and release heat, thereby achieving intermittent heat supply.

[0042] Furthermore, the heating mechanism includes a pressure cap 1 8, a pressure cap 2 9, and a resistance wire 10. The pressure cap 1 8 and the pressure cap 2 9 are sequentially arranged in the heat storage annulus. The pressure cap 1 8 and the pressure cap 2 9 are located on the side of the sealing sleeve 2 5 facing away from the conversion layer 3. The resistance wire 10 is arranged between the pressure cap 1 8 and the pressure cap 2 9. The conversion layer 3 is heated by the resistance wire 10, so that the phase conversion layer 3 absorbs heat and becomes liquid. The liquid conversion layer 3 is conducive to heat transfer, increases the heat release area, improves the heat release efficiency of the resistance wire 10, and avoids heat accumulation.

[0043] Preferably, the resistance wire 10 is located below the conversion layer 3, which can fully utilize the thermodynamic properties of the conversion layer 3 and achieve higher heat release efficiency.

[0044] Specifically, the resistance wire 10 is sleeved on the hollow sucker rod 2. The resistance wire 10 does not contact the pressure cap 1 8, the pressure cap 2 9, the outer tube 1, and the hollow sucker rod 2. The resistance wire 10 is sealed with high-temperature resistant glue to prevent the resistance wire 10 from being corroded by the well fluid, prevent leakage, and facilitate temperature transfer.

[0045] Preferably, the high temperature resistant glue is RTV silicone rubber, which can work normally in the temperature range of -60°C to 200°C and has excellent weather resistance and oxidation resistance.

[0046] Specifically, the pressing cap 1 8 contacts the sealing sleeve 2 5 , which is beneficial to heat transfer and can compress the sealing sleeve 2 5 .

[0047] Specifically, the pressure cap 2 9 is provided with an axial wire hole, a wire joint 14 is provided in the wire hole, the resistance wire 10 leads out the wire 13, the wire 13 passes through the wire hole, the wire 13 is connected to the wire joint 14, and the wire joint 14 facilitates the connection and fixation of the wire 13.

[0048] Preferably, the wire connector 14 is a waterproof connector to further improve the sealing performance of the heating mechanism.

[0049] Specifically, the inner diameter of the outer tube 1 in the heat storage annulus is divided into a small diameter and a large diameter, the conversion layer 3 is located at the small diameter, and the resistance wire 10 is located at the large diameter, so that the resistance wire 10 can emit more heat and fully heat the conversion layer 3.

[0050] Furthermore, a threaded ring 11 is provided on the inner wall of the outer tube 1, and the threaded ring 11 is located in the heat storage annulus. The threaded ring 11 is on the side of the sealing sleeve 4 facing away from the conversion layer 3. The inner hole of the threaded ring 11 is threadedly connected to the outer wall of the hollow sucker rod 2. The threaded ring 11 can compress the sealing sleeve 4 to improve the sealing effect.

[0051] Furthermore, an inner pipe head 12 is provided on the inner wall of the outer pipe 1 , and the inner pipe head 12 contacts the end of the hollow sucker rod 2 close to the thread ring 11 , and the inner pipe head 12 is used to provide positioning for the hollow sucker rod 2 .

[0052] Furthermore, the outer wall of the outer tube 1 is provided with a heat conducting layer 1 6, and the inner wall of the outer tube 1 in contact with the conversion layer 3 is provided with a heat conducting layer 2 7. The materials of the heat conducting layer 1 6 and the heat conducting layer 2 7 are both metal, so as to achieve a heat conduction effect.

[0053] Example 2:

[0054] Based on Example 1, this embodiment provides a method for using a heat-conducting pumping rod for assisting heavy oil recovery, comprising the following steps:

[0055] A heat-conducting sucker rod for assisting heavy oil production is connected to a sucker rod string of a heavy oil well.

[0056] During use, the conversion layer 3 is heated and changes from solid to liquid, storing the absorbed heat. When the oil rod moves to a colder area, its material will re-solidify and release heat, thereby achieving intermittent heat supply. It can not only heat the heavy oil and make it easier to flow, but also reduce energy consumption and lower mining costs.

[0057] Since the first heat-conducting layer 6 and the second heat-conducting layer 7 are both made of metal, they have good heat-conducting effects and can be used for heat exchange, so that heat can be stored through the conversion layer 3 and then the thick oil can be heated.

[0058] In extreme cold weather, the hollow sucker rod 2 can be heated by the cooperation of the conductor 13 and the resistance wire 10. The conversion layer 3, the heat-conducting layer 1 6 and the heat-conducting layer 2 7 quickly release the heat of the resistance wire 10 into the heavy oil, thereby ensuring the easy flowability of the heavy oil.

[0059] This patent has a simple structure and heats heavy oil in two ways, which not only ensures the fluidity of the heavy oil, but also allows the heating method to be selected according to the coldness of the weather, thereby reducing energy consumption and lowering mining costs.

[0060] All components not discussed in detail in this application and the connection methods of the components in this application are well-known technologies in the technical field and can be directly applied without further explanation.

[0061] In this utility model, the term "plurality" refers to two or more, unless otherwise specified. Terms such as "installed," "connected," "connected," and "fixed" should be interpreted broadly. For example, "connected" can mean fixed, removable, or integral; "connected" can mean directly or indirectly through an intermediary. Those skilled in the art will understand the specific meanings of these terms in this utility model based on specific circumstances.

[0062] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by terms such as "up", "down", "left", "right", "front" and "back" are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the present invention.

[0063] Throughout this specification, terms such as "one embodiment," "some embodiments," and "specific embodiments" mean that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0064] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A heat-conducting sucker rod for assisting heavy oil production, comprising an outer tube, a hollow sucker rod, and a conversion layer. The hollow sucker rod is disposed within the outer tube, forming a heat storage annulus with the outer tube. The conversion layer is disposed within the heat storage annulus and can absorb and release heat. It is characterized by: The heat storage annulus is also provided with a heating mechanism.

2. The heat-conducting sucker rod for assisting heavy oil production according to claim 1, characterized in that: The heat storage annulus is provided with a sealing sleeve 1 and a sealing sleeve 2 in sequence, and a conversion layer is provided between the sealing sleeve 1 and the sealing sleeve 2; The heating mechanism includes a first pressing cap, a second pressing cap, and a resistance wire; The first and second pressure caps are sequentially arranged in the heat storage annulus; The first and second pressure caps are located on the side of the second sealing sleeve facing away from the conversion layer; The resistance wire is arranged between the first pressure cap and the second pressure cap.

3. The heat-conducting sucker rod for assisting heavy oil production according to claim 1, characterized in that: The conversion layer is a phase change material.

4. The heat-conducting sucker rod for assisting heavy oil production according to claim 2, characterized in that: The resistance wire is located below the conversion layer.

5. The heat-conducting sucker rod for assisting heavy oil production according to claim 2, characterized in that: The resistance wire is sleeved on the hollow sucker rod, and the resistance wire does not contact the first and second pressure caps, the outer tube, and the hollow sucker rod. The resistance wire is potted with high-temperature resistant glue.

6. The heat-conducting sucker rod for assisting heavy oil production according to claim 2, characterized in that: The first pressing cap contacts the second sealing sleeve.

7. The heat-conducting sucker rod for assisting heavy oil production according to claim 2, characterized in that: The second pressing cap is provided with an axial wire passing hole, a wire passing connector is provided in the wire passing hole, a wire is led out of the resistance wire, the wire is passed through the wire passing hole, and the wire is connected to the wire passing connector.

8. The heat-conducting sucker rod for assisting heavy oil production according to claim 2, characterized in that: The inner diameter of the outer pipe in the heat storage annulus is divided into a small diameter and a large diameter, the conversion layer is located at the small diameter, and the resistance wire is located at the large diameter.

9. The heat-conducting sucker rod for assisting heavy oil production according to claim 2, characterized in that: The inner wall of the outer tube is provided with a thread ring, the thread ring is located in the heat storage annulus, and the thread ring is on the side of the sealing sleeve facing away from the conversion layer; The inner hole of the thread ring is threadedly connected to the outer wall of the hollow sucker rod, and the thread ring can press the sealing sleeve; An inner pipe head is provided on the inner wall of the outer pipe, and the inner pipe head contacts the end of the hollow sucker rod close to the threaded ring.

10. A heat-conducting sucker rod for assisting heavy oil recovery according to any one of claims 1 to 9, characterized in that: The outer wall of the outer tube is provided with a first heat-conducting layer, and the inner wall of the outer tube in contact with the conversion layer is provided with a second heat-conducting layer.

Images