Double hollow sucker rod ground circulation heating device
By setting up a reflux cavity and circulation mechanism in the double hollow sucker rod ground circulation heating device, combined with heating tube stirring and multiple heating methods, the problems of heat loss and uneven temperature in the existing technology are solved, and a highly efficient heat exchange effect is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- HEBEI LEYUAN PETROLEUM EQUIP CO LTD
- Filing Date
- 2026-04-07
- Publication Date
- 2026-06-09
AI Technical Summary
Existing ground-based circulating heating devices suffer from significant heat loss due to uneven water temperature and a single flow path, lacking continuous heating capacity and resulting in poor heat exchange efficiency.
The system employs an outer hollow oil extraction pipe and an inner hollow oil extraction pipe to form a reflux cavity. Combined with a circulation mechanism, it drives the hot fluid to circulate. The heating pipe in the heating mechanism stirs the water, and the furnace mechanism provides multiple heating methods to ensure that the hot fluid maintains the required temperature during circulation.
It significantly improves heat exchange efficiency, ensures uniform temperature of the hot fluid during circulation, avoids heat loss, enhances heat exchange effect, and improves the applicability and flexibility of the device.
Smart Images
Figure CN122169751A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of heat exchanger technology, specifically relating to a ground circulation heating device with double hollow sucker rods. Background Technology
[0002] The double-hollow pumping unit is a specialized device for the extraction of heavy oil and high-pour-point oil wells. It can inject hot fluids or chemical agents into the well to achieve heating and viscosity reduction, wax removal, and anti-clogging. Together with the pumping unit and pumping pump, it can lift crude oil to the surface. It features high thermal efficiency, energy saving, and stable operation.
[0003] Existing surface circulating heating devices typically use burners to directly heat the water in the heating chamber, and then use circulating pumps to transport the hot water to the double hollow sucker rods downhole for heat exchange. However, this heating method has the following drawbacks: First, the water in the heating chamber only transfers heat through natural convection, resulting in uneven temperature distribution and low heat exchange efficiency. Second, the flow path of the hot fluid in the sucker rod is singular, leading to significant heat loss and making it difficult to maintain the required downhole temperature. Third, the heating device lacks the ability to continuously heat the circulating fluid, resulting in a discontinuous heat exchange process and poor overall heat exchange efficiency. Summary of the Invention
[0004] The purpose of this invention is to provide a surface circulating heating device for double hollow sucker rods, which solves the technical problems in related technologies where the burner heats water and pumps it to the downhole sucker rod for heat exchange, but the uneven water temperature and single flow path lead to large heat loss and lack of continuous heating capacity, resulting in a discontinuous heat exchange process and poor overall heat exchange efficiency.
[0005] At least one embodiment of the present invention provides a ground circulation heating device with double hollow sucker rods, including a heating box, and further including: an outer hollow sucker pipe, a sealing box, a circulation mechanism, and a heating mechanism. An inner hollow sucker pipe is fixedly connected inside the outer hollow sucker pipe, and a reflux cavity is formed between the inner wall of the outer hollow sucker pipe and the inner wall of the inner hollow sucker pipe. The sealing box is fixedly connected to the top end of the outer hollow sucker pipe and communicates with the outer hollow sucker pipe. The top end of the inner hollow sucker pipe passes through the sealing box and extends outside the sealing box. The circulation mechanism is disposed on the heating box and is used to drive the hot fluid to circulate in the outer hollow sucker pipe and the inner hollow sucker pipe. The heating mechanism is disposed inside the heating box and is used to heat the water in the heating box.
[0006] To circulate and heat the hot fluid and improve heat exchange efficiency, the circulation mechanism includes a coil, a delivery pump, an output pipe, and a return pipe. The coil is fixedly connected inside the heating chamber. The delivery pump is installed on one side of the heating chamber. There are two output pipes. One output pipe has its two ends connected to the input end of the delivery pump and the bottom end of the coil, respectively. The other output pipe has its two ends connected to the output end of the delivery pump and the sealing box, respectively. One end of the return pipe is connected to the top end of the inner hollow oil extraction pipe, and the other end of the return pipe is connected to the top end of the coil.
[0007] To heat the coils inside the heating chamber, the heating mechanism includes: a rotating plate, a fixed frame, heating tubes, and a rotating assembly. The rotating plate is rotatably connected to the heating chamber, which has a rotating opening. The rotating plate is rotatably connected within the rotating opening. The fixed frame is fixedly connected to the rotating plate. Two heating tubes are provided, both mounted at the bottom of the fixed frame. The rotating assembly is located at the top of the heating chamber and drives the rotating plate and fixed frame to rotate, thereby agitating and heating the water inside the heating chamber. The rotating assembly includes: a rotating gear, a gear plate, and a drive assembly. A protective cover is installed at the top of the heating chamber, and the drive assembly is located inside the protective cover. The rotating gear is fixedly connected to the rotating plate. The toothed plate is slidably connected to the top of the heating box via a sliding assembly, and meshes with a rotating gear. A drive assembly is located at the top of the heating box and is used to drive the toothed plate to reciprocate. The sliding assembly includes a slide rod and a slide frame. The slide rod is fixedly connected to the top of the heating box, and the slide frame is slidably connected to the slide rod. The toothed plate is fixedly connected to the slide frame. The drive assembly includes a slide box, a stabilizer, a drive frame, and a motor. The slide box is fixedly connected to the top of the slide frame, and the stabilizer is fixedly connected to the top of the heating box. The bottom end of the drive frame rotates and is slidably connected within the slide box. The motor is mounted at the top of the stabilizer, and its output end passes through the stabilizer and is fixedly connected to the top of the drive frame.
[0008] To heat the water in the heating chamber in multiple ways, a furnace mechanism is installed at the bottom of the heating chamber. The furnace mechanism includes a furnace box, a door panel, and an exhaust assembly. The furnace box is fixedly connected to the bottom of the heating chamber. A sliding groove is provided on the furnace box, and the door panel is slidably connected in the sliding groove. The exhaust assembly is located on one side of the furnace box and is used to exhaust the flue gas generated during combustion in the furnace box. The exhaust assembly includes an exhaust port and an exhaust fan. There are two exhaust ports, both of which are located on one side of the furnace box. There are two exhaust fans, each installed at one of the two exhaust ports.
[0009] The ground circulation heating device with double hollow sucker rods provided in this invention features an outer hollow sucker pipe and an inner hollow sucker pipe forming a reflux cavity. A circulation mechanism drives the hot fluid to circulate within the inner and outer pipes, achieving continuous heating of the hot fluid, avoiding heat loss, and significantly improving heat exchange efficiency. Simultaneously, the heating mechanism includes a rotatable heating tube that stirs the water in the heating chamber during heating, ensuring uniform water temperature and further enhancing the heat exchange effect between the coil and water. This ensures the hot fluid maintains the required temperature throughout the circulation process. Furthermore, the furnace mechanism provides multiple heating methods that can be flexibly selected according to site conditions, improving the device's applicability. Attached Figure Description
[0010] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0011] Figure 1 This is a schematic diagram of the overall structure provided in an embodiment of the present invention; Figure 2 This is a structural schematic diagram from another angle provided by an embodiment of the present invention; Figure 3 This is a cross-sectional schematic diagram of the outer hollow sucker pipe and the inner hollow sucker pipe provided in the embodiments of the present invention; Figure 4 This is a cross-sectional structural schematic diagram of the heating box provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of the heating mechanism provided in an embodiment of the present invention; Figure 6 This is a schematic diagram of the structure of the driving component provided in an embodiment of the present invention; Figure 7 This is a schematic diagram of the furnace mechanism provided in an embodiment of the present invention.
[0012] In the diagram: 1. Heating box; 2. Outer hollow oil extraction pipe; 3. Inner hollow oil extraction pipe; 4. Return cavity; 5. Sealing box; 6. Coil; 7. Transfer pump; 8. Output pipe; 9. Return pipe; 10. Rotating plate; 11. Fixing frame; 12. Heating tube; 13. Rotating gear; 14. Gear plate; 15. Slide rod; 16. Slide frame; 17. Slide box; 18. Stabilizing frame; 19. Drive frame; 20. Motor; 21. Furnace chamber; 22. Door panel; 23. Exhaust vent; 24. Exhaust fan; 25. Protective cover. Detailed Implementation
[0013] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure. For ease of understanding, the English abbreviations and related technical terms involved in the embodiments of this disclosure will be explained and described below.
[0014] It should be understood that the described embodiments are merely some, not all, of the embodiments disclosed herein. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without inventive effort are within the scope of protection of this disclosure.
[0015] The terminology used in the embodiments of this disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of this disclosure. The singular forms “a,” “the,” and “the” as used in the embodiments of this disclosure and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.
[0016] It should be understood that the term "and / or" used in this article is merely a way of describing the logical relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.
[0017] Depending on the context, the word "if" as used here can be interpreted as "when" or "when" or "in response to determination" or "in response to detection." Similarly, depending on the context, the phrase "if determination" or "if detection (of the stated condition or event)" can be interpreted as "when determination" or "in response to determination" or "when detection (of the stated condition or event)" or "in response to detection (of the stated condition or event)."
[0018] It should be understood that the terms "first," "second," etc., used in this disclosure are for distinguishing purposes only and should not be construed as indicating or implying relative importance or order.
[0019] In the description of this disclosure, the terms “center,” “upper,” “lower,” “front,” “back,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” and “outer,” etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this disclosure and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and should not be construed as a limitation of this disclosure.
[0020] In the description of this disclosure, it should be noted that, unless otherwise expressly specified and limited, the terms "installation", "connection" and "joining" should be interpreted broadly, for example, they can be fixed connections, detachable connections, mating connections or integral connections; those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.
[0021] like Figures 1-7 As shown, a surface circulation heating device for double hollow sucker rods according to an embodiment of the present invention is illustrated. It includes a heating box 1, an outer hollow sucker pipe 2, a sealing box 5, a circulation mechanism, and a heating mechanism. An inner hollow sucker pipe 3 is fixedly connected inside the outer hollow sucker pipe 2. A reflux cavity 4 is formed between the inner wall of the outer hollow sucker pipe 2 and the inner wall of the inner hollow sucker pipe 3. The sealing box 5 is fixedly connected to the top end of the outer hollow sucker pipe 2 and communicates with it. The top end of the inner hollow sucker pipe 3 penetrates the sealing box 5 and extends outside the sealing box 5, allowing hot fluid to enter the reflux cavity 4 from the sealing box 5, flow downwards to the bottom of the well, and then return upwards to the surface from the inside of the inner hollow sucker pipe 3, forming a complete circulation loop and ensuring that heat can be evenly transferred to the crude oil in the wellbore.
[0022] The circulation mechanism is installed on the heating box 1 to facilitate the circulation of hot fluid in the outer hollow oil extraction pipe 2 and the inner hollow oil extraction pipe 3. The heating mechanism is installed inside the heating box 1 to facilitate the heating of the water inside the heating box 1.
[0023] The circulation mechanism includes: a coil 6, a delivery pump 7, an output pipe 8, and a return pipe 9. The coil 6 is fixedly connected inside the heating box 1 to increase the contact area with the heated water. The delivery pump 7 is installed on one side of the heating box 1. There are two output pipes. One output pipe 8 is connected to the input end of the delivery pump 7 and the bottom end of the coil 6 at both ends, respectively. The other output pipe 8 is connected to the output end of the delivery pump 7 and the sealing box 5 at both ends, respectively. One end of the return pipe 9 is connected to the top end of the inner hollow oil extraction pipe 3, and the other end of the return pipe 9 is connected to the top end of the coil 6.
[0024] During operation, the delivery pump 7 extracts the hot fluid from the coil 6 and sends it into the sealing box 5 through the output pipe 8. The hot fluid goes down along the return cavity 4, then goes up through the inner hollow oil extraction pipe 3, and finally returns to the coil 6 through the return pipe 9. This cycle repeats continuously to achieve the circulating heating of the hot fluid.
[0025] The heating mechanism is used to heat the water in the heating box 1 and make its temperature uniform. It includes: a rotating plate 10, a fixed frame 11, heating tubes 12 and a rotating assembly. The rotating plate 10 is rotatably connected to the heating box 1. The heating box 1 has a rotating opening. The rotating plate 10 is rotatably connected to the rotating opening. The fixed frame 11 is fixedly connected to the rotating plate 10. Two heating tubes 12 are installed at the bottom of the fixed frame 11 and are immersed in the water in the heating box 1.
[0026] The rotating assembly is located at the top of the heating box 1 and is used to drive the rotating plate 10 and the fixed frame 11 to rotate, thereby driving the heating tube 12 to stir the water while heating. The rotating assembly includes a rotating gear 13, a toothed plate 14 and a drive assembly. A protective cover 25 is installed at the top of the heating box 1. The drive assembly is located inside the protective cover 25. The rotating gear 13 is fixedly connected to the top of the fixed frame 11. The toothed plate 14 is slidably connected to the top of the heating box 1 through a sliding assembly. The toothed plate 14 meshes with the rotating gear 13.
[0027] The drive assembly is located at the top of the heating chamber 1 and is used to drive the toothed plate 14 to reciprocate. The sliding assembly includes a slide rod 15 and a slide frame 16. The slide rod 15 is fixedly connected to the top of the heating chamber 1, the slide frame 16 is slidably connected to the slide rod 15, and the toothed plate 14 is fixedly connected to the slide frame 16. The drive assembly includes a slide box 17, a stabilizer 18, a drive frame 19, and a motor 20. The slide box 17 is fixedly connected to the top of the slide frame 16, the stabilizer 18 is fixedly connected to the top of the heating chamber 1, the bottom end of the drive frame 19 rotates and is slidably connected inside the slide box 17, and the motor 20 is installed at the top of the stabilizer 18. The output end of the motor 20 passes through the stabilizer 18 and is fixedly connected to the top of the drive frame 19.
[0028] When the motor 20 starts, it drives the drive frame 19 to rotate. The bottom end of the drive frame 19 slides in the slide box 17 and pushes the slide box 17 to reciprocate. This drives the toothed plate 14 to move back and forth through the slide 16, causing the rotating gear 13, the fixed frame 11 and the heating tube 12 to swing back and forth, thereby achieving uniform stirring of the water and significantly improving heating efficiency.
[0029] The bottom of the heating box 1 is equipped with a furnace mechanism, which includes a furnace box 21, a door panel 22, and an exhaust assembly. The furnace box 21 is fixedly connected to the bottom of the heating box 1. A sliding groove is provided on the furnace box 21, and the door panel 22 is slidably connected in the sliding groove. The exhaust assembly is located on one side of the furnace box 21 and is used to exhaust the flue gas generated during combustion in the furnace box 21. The exhaust assembly includes an exhaust port 23 and an exhaust fan 24. There are two exhaust ports 23, both of which are located on one side of the furnace box 21. There are two exhaust fans 24, which are installed at the two exhaust ports 23 respectively.
[0030] When there is no electric heating available on site or when rapid heating is required, the door panel 22 can be opened to add fuel into the furnace box 21, directly heating the bottom of the heating box 1, realizing the flexible use of multiple energy sources, and the flue gas in the furnace box 21 can be discharged through the exhaust fan 24.
[0031] Working principle: When using this device to heat crude oil downhole, first inject hot fluid into the circulation system, usually heat transfer oil or water, and ensure that the coil 6, output pipe 8, return pipe 9, outer hollow oil extraction pipe 2 and inner hollow oil extraction pipe 3 are filled with hot fluid. At the same time, add an appropriate amount of water to the heating box 1 so that the heating pipe 12 is submerged in water. The heating element 12 is activated to heat the water in the heating tank 1, and the motor 20 is started. The motor 20 drives the drive frame 19 to rotate, and the bottom end of the drive frame 19 slides inside the sliding box 17, forcing the sliding box 17 to move back and forth. This, in turn, drives the toothed plate 14 to move back and forth through the slide 16. The toothed plate 14 meshes with the rotating gear 13, causing the fixed frame 11 and the heating element 12 to swing back and forth, stirring the water and causing the water temperature to rise rapidly and evenly. Then, the delivery pump 7 is started to extract the hot fluid from the coil 6 and output it through the outlet. Pipe 8 delivers the hot fluid to the sealing box 5. The hot fluid enters the return cavity 4 between the outer hollow sucker pipe 2 and the inner hollow sucker pipe 3 from the sealing box 5, flows downward to the bottom of the well, and transfers heat to the crude oil in the wellbore during this process. Then, the hot fluid enters the inner tube from the bottom of the inner hollow sucker pipe 3, flows upward to the top, and returns to the coil 6 through the return pipe 9. In the coil 6, the hot fluid exchanges heat with the hot water in the heating box 1 again, and the temperature is replenished. This cycle repeats to achieve continuous heating of the crude oil downhole. If there is insufficient power on site or rapid heating is required, the furnace heating mode can also be used: open the door panel 22, add fuel and ignite it in the furnace box 21, the flame directly heats the bottom of the heating box 1 to raise the water temperature, and at the same time start the exhaust fan 24 to discharge the flue gas generated by combustion from the exhaust port 23 to keep the furnace well ventilated. During use, the following precautions should be taken: Heating tube 12 is submerged in water for a long time, so its insulation performance should be ensured; heating box 1 should have reliable grounding protection; when heating in the furnace, incomplete combustion of fuel should be avoided to prevent the generation of carbon monoxide; exhaust fan 24 should be ensured to work normally to prevent the accumulation of flue gas; when the circulation system is initially filled with liquid, air should be purged to avoid air resistance affecting circulation efficiency; the sealing box 5 and the sealing of each pipeline connection should be checked regularly to prevent the leakage of hot fluid.
[0032] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
Claims
1. A ground circulation heating device for double hollow sucker rods, comprising a heating box (1), characterized in that, Also includes: An outer hollow oil extraction pipe (2) is fixedly connected to an inner hollow oil extraction pipe (3), and a reflux cavity (4) is formed between the inner wall of the outer hollow oil extraction pipe (2) and the inner wall of the inner hollow oil extraction pipe (3). A sealing box (5) is fixedly connected to the top end of the outer hollow oil extraction pipe (2) and the sealing box (5) is connected to the outer hollow oil extraction pipe (2). The top end of the inner hollow oil extraction pipe (3) passes through the sealing box (5) and extends to the outside of the sealing box (5). A circulation mechanism is provided on the heating box (1) to drive the hot fluid to circulate in the outer hollow oil extraction pipe (2) and the inner hollow oil extraction pipe (3); A heating mechanism is provided inside the heating box (1) for heating the water inside the heating box (1).
2. The ground circulation heating device with double hollow sucker rods according to claim 1, characterized in that, The circulation mechanism includes: The coil (6) is fixedly connected inside the heating box (1); A delivery pump (7) is installed on one side of the heating box (1); Output pipe (8), there are two output pipes (8), one of which is connected to the input end of the delivery pump (7) and the bottom end of the coil (6) at both ends, and the other output pipe (8) is connected to the output end of the delivery pump (7) and the sealing box (5) at both ends. The return pipe (9) has one end connected to the top end of the hollow oil extraction pipe (3) and the other end connected to the top end of the coil (6).
3. The ground circulation heating device with double hollow sucker rods according to claim 1, characterized in that, The heating mechanism includes: Rotating plate (10), the rotating plate (10) is rotatably connected to the heating box (1); A fixing frame (11) is fixedly connected to the rotating plate (10); Heating tube (12), two heating tubes (12) are provided, and both heating tubes (12) are installed at the bottom end of the fixing frame (11); A rotating assembly is located at the top of the heating box (1) and is used to drive the rotating plate (10) and the fixed frame (11) to rotate, thereby driving the heating tube (12) to stir the water in the heating box (1) and heat the water at the same time.
4. The ground circulation heating device with double hollow sucker rods according to claim 3, characterized in that, The rotating assembly includes: Rotating gear (13), the rotating gear (13) is fixedly connected to the top of the fixed frame (11); A toothed plate (14) is slidably connected to the top of the heating box (1) via a sliding assembly, and the toothed plate (14) meshes with the rotating gear (13); A drive assembly is disposed at the top of the heating box (1) and is used to drive the toothed plate (14) to reciprocate.
5. The ground circulation heating device with double hollow sucker rods according to claim 4, characterized in that, The sliding component includes: A slide bar (15) is fixedly connected to the top of the heating box (1); The slide (16) is slidably connected to the slide rod (15), and the toothed plate (14) is fixedly connected to the slide (16).
6. The ground circulation heating device with double hollow sucker rods according to claim 5, characterized in that, The driving component includes: Slide box (17), the slide box (17) is fixedly connected to the top of the slide frame (16); A stabilizing frame (18) is fixedly connected to the top of the heating box (1); Drive frame (19), the bottom end of which is rotatably and slidably connected inside the slide box (17); The motor (20) is mounted on the top of the stabilizer (18), and the output end of the motor (20) passes through the stabilizer (18) and is fixedly connected to the top of the drive frame (19).
7. The ground circulation heating device with double hollow sucker rods according to claim 1, characterized in that, The bottom end of the heating box (1) is equipped with a furnace mechanism, which includes: Furnace box (21), which is fixedly connected to the bottom end of the heating box (1); The door panel (22) is provided with a sliding groove on the furnace box (21), and the door panel (22) is slidably connected in the sliding groove; An exhaust assembly is provided on one side of the furnace box (21) for discharging the flue gas generated during combustion inside the furnace box (21).
8. The ground circulation heating device with double hollow sucker rods according to claim 7, characterized in that, The exhaust assembly includes: Two exhaust vents (23) are provided, and both exhaust vents (23) are opened on one side of the furnace box (21); Two exhaust fans (24) are provided, and the two exhaust fans (24) are respectively installed at two exhaust ports (23).
9. The ground circulation heating device with double hollow sucker rods according to claim 3, characterized in that, The heating box (1) has a rotating opening, and the rotating plate (10) is rotatably connected inside the rotating opening.
10. The ground circulation heating device with double hollow sucker rods according to claim 6, characterized in that, The top of the heating box (1) is equipped with a protective cover (25), and the drive assembly is located inside the protective cover (25).