Double-hollow-rod over-pump heating system

Abstract

The utility model relates to the technical field of double-hollow-rod over-pump heating systems, and discloses a double-hollow-rod over-pump heating system which comprises a hollow rod body, a pump cylinder is installed on the inner wall of the hollow rod body, a lower pull rod connected with a rod is arranged in the pump cylinder, a coupling pull rod is arranged on the lower pull rod, and an oil guide groove is formed in a coupling at the joint of the piston pull rod and the piston. A gap is formed between the interior of the piston and the pull rod for flowing of crude oil, the pump rod is arranged on the lower pull rod at the lower end of the piston, the fixed coupling is arranged at the joint, the oil guide groove channel is formed in the fixed coupling, the cross-shaped clamping strip is arranged at the lower end of the coupling pull rod, and the oil-driven valve sleeve is arranged on the pump rod at the lower end of the piston. According to the thickened oil energy-saving pump, the valve ball coupling pull rod on the oil-driven valve sleeve seals the lower end of the oil guide groove coupling pull rod under the action of crude oil pressure, crude oil is prevented from flowing back, and therefore the problem that a connector of an existing thickened oil energy-saving pump is a smooth face, rotation is not facilitated, and inconvenience is caused to follow-up use and installation is solved.

Description

Technical Field

[0001] This utility model relates to the technical field of double hollow rod pump heating systems, and in particular to a double hollow rod pump heating system. Background Technology

[0002] The double hollow rod pump is a device used in the field of heavy oil extraction. It consists of a closed internal circulation heating rod and an oil pump. The closed internal circulation heating rod includes an outer tube, an inner tube and a terminal block that are fixed together. An inner channel is formed inside the inner tube, and an annular gap between the outer tube and the inner tube forms an outer channel. The terminal block connects the lower port of the inner channel and the upper port of the outer channel.

[0003] A search revealed Chinese patent publication number CN202348235U, which discloses a heavy oil energy-saving pump-assisted thermal recovery system device. This system includes a closed internal circulation heating rod, a heater, a circulation pump, a drive unit, and a pumping unit. The heater heats the heat transfer medium, storing the heat energy within it. The circulation pump provides sufficient circulating pressure to overcome the friction of the closed internal circulation in the well, allowing the heat transfer medium to circulate. The heat transfer medium heats the heavy oil between the outer pipe and the pump barrel to achieve viscosity reduction and wax removal. The drive unit drives the heating rod to slide between a first position and a second position, causing the moving valve ball and moving valve seat, and the fixed valve ball and fixed valve seat to circulate and disconnect, thereby achieving the purpose of oil recovery. It can produce the following technical effects: it can save energy and money significantly, saving more than 150,000 yuan per year per thermal well; it can use a variety of heat transfer media and utilize a variety of heat sources, such as solar energy, industrial waste heat, air source heat pumps, associated gas from oil wells, associated hot water, secondary coal or combustible waste, etc., saving a lot of energy and reducing thermal recovery costs. However, the connection port of the existing heavy oil energy-saving pump is a smooth surface, which is not conducive to rotation, thus causing inconvenience to subsequent use and installation. Utility Model Content

[0004] To overcome the above shortcomings, this utility model provides a double hollow rod over-pump heating system, which aims to improve the existing heavy oil energy-saving over-pump connection port, which is a smooth surface, making rotation difficult and causing inconvenience for subsequent use and installation.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a double hollow rod pump heating system, comprising a hollow rod body, a pump cylinder installed on the inner wall of the hollow rod body, a pull rod connected to the rod inside the pump cylinder, a coupling rod on the pull rod, an oil guide groove on the coupling connecting the pull rod and the piston, a gap between the piston and the pull rod for crude oil flow, a pump rod on the lower end of the pull rod of the piston, a fixed coupling at the connection, an oil guide groove channel on the fixed coupling, a cross retaining strip at the lower end of the coupling rod, an oil-operated valve sleeve on the pump rod at the lower end of the piston, a plum blossom-shaped oil guide groove at the upper end of the valve sleeve, a valve ball fixed at the lower end of the oil guide groove, a locking valve oil-operated valve sleeve with a groove at the lower end of the sealing end, a cross retaining groove on the lower end rod of the oil-operated valve sleeve, a slotted cut on the lower end rod of the piston, an inner channel opened on the inner wall of the hollow rod body, an outer channel opened on the outer wall of the inner channel, and a fixed valve seat installed in the upper middle part of the inner wall of the hollow rod body.

[0006] As a further description of the above technical solution:

[0007] A sealing gasket is fixedly connected to the bottom of the outer wall of the hollow rod.

[0008] As a further description of the above technical solution:

[0009] A retaining ring is installed on the inner wall of the hollow rod.

[0010] As a further description of the above technical solution:

[0011] A sand guide is installed on the inner wall of the hollow rod.

[0012] As a further description of the above technical solution:

[0013] A fixing rod is installed on the inner wall of the hollow rod.

[0014] As a further description of the above technical solution:

[0015] The outer wall of the hollow rod is fitted with a protective sleeve.

[0016] This utility model has the following beneficial effects:

[0017] 1. In this utility model, when the hollow rod coupling rod moves upward, it drives the related coupling rods and piston coupling rods to move upward. The space below the piston increases, the pressure decreases, and crude oil enters the space below the piston under the pressure at the bottom of the well. At the same time, crude oil enters the space above through the internal gap of the piston. The valve ball coupling rod on the oil-operated valve sleeve seals the lower end of the oil guide groove coupling rod under the pressure of crude oil, preventing crude oil backflow. This avoids the problem that the connection port of the existing heavy oil energy-saving pump is a smooth surface, which is not conducive to rotation and thus causes inconvenience to subsequent use and installation.

[0018] 2. In this utility model, a sealing gasket is connected to the bottom of the hollow rod body, which fits tightly against the rod body. The surface of the sealing gasket has anti-slip texture, and an oil-resistant fiber mesh layer is embedded inside to enhance protection against high temperature, high pressure and corrosive media. The sealing gasket effectively prevents liquid leakage, ensuring that crude oil and heating medium do not overflow from the bottom of the rod body, while preventing external impurities and mud from entering the interior of the rod body, ensuring the stable operation of the double hollow rod pump heating system and extending the service life of the equipment. Attached Figure Description

[0019] Figure 1 This is a cross-sectional view of a double hollow rod pump heating system proposed in this utility model.

[0020] Legend:

[0021] 1. Hollow rod body; 2. Sealing gasket; 3. Coupling rod; 4. Snap ring; 5. Fixed valve seat; 6. Valve ball; 7. Sand guide; 8. Oil guide groove; 9. Pull rod; 10. Piston; 11. Fixed pull rod; 12. Pump barrel; 13. Inner channel; 14. Outer channel; 15. Protective sleeve; 16. Fixed coupling. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Reference Figure 1This utility model provides an embodiment of a double hollow rod pump heating system, including a hollow rod body 1, a pump cylinder 12 installed on the inner wall of the hollow rod body 1, a pull rod 9 connected to the rod inside the pump cylinder 12, a coupling rod 3 on the pull rod 9, an oil guide groove 8 at the connection between the coupling rod 3 and the piston 10, a gap between the piston 10 and the coupling rod for crude oil flow, a pump rod on the lower end of the piston 10 and the pull rod 9, a fixed coupling 16 at the connection, an oil guide groove 8 channel on the fixed coupling 16, a cross retaining strip at the lower end of the coupling rod 3, an oil-operated valve sleeve on the lower end of the pump rod of the piston 10, a plum blossom-shaped oil guide groove 8 at the upper end of the valve sleeve, a valve ball 6 fixed at the lower end of the oil guide groove 8, and a locking valve oil-operated valve sleeve with a retaining groove at the lower end of the sealing oil guide groove 8. A cross-shaped notch is provided on the end rod, and a slotted notch is provided on the lower end rod of the piston 10. An inner channel 13 is provided on the inner wall of the hollow rod body 1, and an outer channel 14 is provided on the outer wall of the inner channel 13. A fixed valve seat 5 is installed in the upper middle part of the inner wall of the hollow rod body 1. The fixed valve seat 5 can ensure reliable sealing and structural stability under complex downhole conditions, such as frequent start-stop of the oil pump and severe vibration of the rod string, through the annular groove with the hollow rod body 1. This ensures the high efficiency and reliability of unidirectional crude oil delivery in the double hollow rod pump heating system. A retaining ring 4 is installed on the inner wall of the hollow rod body 1. The retaining ring 4 adopts an embedded installation method to ensure that the hollow rod body 1 remains stable and reliable under complex conditions of high temperature, high pressure and frequent vibration.

[0024] Specifically, when the hollow rod 1 moves upward, it drives the pull rod 9, the coupling pull rod 3, and the piston 10 to move upward. At this time, the space below the piston 10 increases, the pressure decreases, and crude oil, under the action of the bottom hole pressure, enters the space below the piston 10 through the oil guide groove 8 channel on the fixed coupling 16. At the same time, because there is a gap between the piston 10 and the pull rod, crude oil can also enter the space above the piston 10 through this gap. Under the action of crude oil pressure, the valve ball 6 on the lower end rod of the hydraulic valve sleeve will close the lower end of the oil guide groove 8 to prevent crude oil backflow. When the hollow rod 1 moves downward, it drives... As the pull rod 9, coupling rod 3, and piston 10 move downwards, the space below piston 10 decreases, the pressure increases, and the crude oil is squeezed out. It flows upwards through the oil guide groove 8 on piston 10 and the channel around the cross-shaped retaining strip at the lower end of coupling rod 3. When the crude oil pressure is sufficient to overcome the resistance of the fixed valve seat 5, the crude oil will push open the fixed valve seat 5 and enter the inner channel 13 and outer channel 14 of the hollow rod body 1, ultimately being transported to the ground. The inner wall of the hollow rod body 1 has an inner channel 13, and the outer wall has an outer channel 14. These two channels can be used to circulate the heating medium between the inner channel 13 and the outer channel 14. The oil circulates in channel 14, transferring heat to the hollow rod 1 and the crude oil within it, reducing the viscosity of the crude oil and improving its fluidity, thus facilitating crude oil extraction and transportation. Piston 10 acts as a one-way valve; when piston 10 moves upward, valve ball 6 closes the oil guide groove 8 to prevent crude oil backflow; when piston 10 moves downward, valve ball 6 opens under the pressure of the crude oil, allowing the crude oil to flow upward. Fixed valve seat 5 controls the process of crude oil entering the inner channel 13 and outer channel 14 from the space above piston 10. Only when the crude oil pressure below piston 10 is sufficiently high can the fixed valve be opened. The valve seat 5 facilitates the discharge of crude oil, improving the efficiency of heavy oil extraction. A fixed valve seat 5 is installed on the upper part of the inner wall of the hollow rod body 1. The fixed valve seat 5, through an annular groove, ensures reliable sealing and structural stability under complex downhole conditions, such as frequent start-stop of the oil pump and severe vibration of the rod string. This ensures the high efficiency and reliability of unidirectional crude oil delivery in the double hollow rod pump heating system. A retaining ring 4 is installed on the inner wall of the hollow rod body 1. The retaining ring 4 adopts an embedded installation method to ensure that the hollow rod body 1 remains stable and reliable under complex conditions of high temperature, high pressure and frequent vibration.

[0025] Reference Figure 1 A sealing gasket 2 is fixedly connected to the bottom of the outer wall of the hollow rod 1. A sand guide 7 is installed on the inner wall of the hollow rod 1. The sand guide 7 fits tightly with the inner wall of the hollow rod 1 to ensure seamless connection with the inner wall of the hollow rod 1 and prevent crude oil from leaking in the gap between the two. The sand guide 7 is equipped with a spiral sand guiding channel inside, which can effectively guide the sand particles in the crude oil to flow along a specific path and avoid the sand particles directly hitting and abrading the inner wall of the hollow rod 1 and other internal parts.

[0026] Specifically, a sealing gasket 2 is fixedly connected to the bottom of the outer wall of the hollow rod 1. The sealing gasket 2 is integrally molded from high-performance rubber material, and its annular structure closely fits the contour of the outer wall of the hollow rod 1, ensuring seamless connection with external equipment. The surface of the sealing gasket 2 is evenly distributed with anti-slip textures, which can effectively increase friction and prevent displacement during assembly. An oil-resistant fiber mesh layer is also embedded inside, which enhances the resistance to high temperature, high pressure and corrosive media while ensuring sealing performance. The sealing gasket 2 can prevent liquid seepage from the inner and outer channels 14 of the hollow rod 1. To prevent crude oil and heating medium from overflowing from the bottom of the rod, and to prevent external impurities and silt from entering the rod, ensuring the stable operation of the double hollow rod pump heating system and extending the service life of the equipment, the sand guide 7 is tightly fitted to the inner wall of the hollow rod 1, ensuring a seamless connection and preventing crude oil from leaking into the gap between them. The sand guide 7 has a spiral sand guiding channel inside, which can effectively guide the sand particles in the crude oil to flow along a specific path, avoiding direct impact and wear of the sand particles on the inner wall of the hollow rod 1 and other internal parts.

[0027] Reference Figure 1 The inner wall of the hollow rod 1 is equipped with a fixed tie rod 11. The fixed tie rod 11 not only provides reliable support and guidance for the moving parts of the pull rod 9 and piston 10, ensuring smooth movement along the predetermined trajectory, but also withstands the alternating action of tension and pressure during the pumping process, effectively transmitting power and avoiding problems such as reduced pump efficiency and increased component wear caused by tie rod swaying or displacement. This improves the overall reliability and working efficiency of the double hollow rod pump heating system. The outer wall of the hollow rod 1 is equipped with a protective sleeve 15. The protective sleeve 15 installed on the outer wall of the hollow rod 1 can effectively resist scratches from external sharp objects and impacts from sand and gravel, and has good elasticity and shock absorption performance. It can absorb the impact force generated by equipment vibration and tubing collision during downhole operations, reducing equipment maintenance costs and operational risks.

[0028] Specifically, a fixed tie rod 11 is installed on the inner wall of the hollow rod 1. The fixed tie rod 11 not only provides reliable support and guidance for the moving parts of the pull rod 9 and piston 10, ensuring smooth movement along the predetermined trajectory, but also withstands the alternating action of tension and pressure during the pumping process, effectively transmitting power and avoiding problems such as reduced pump efficiency and increased component wear caused by tie rod swaying or displacement. This improves the overall reliability and working efficiency of the double hollow rod pump heating system. A protective sleeve 15 is installed on the outer wall of the hollow rod 1. The protective sleeve 15 installed on the outer wall of the hollow rod 1 can effectively resist scratches from external sharp objects and impacts from sand and gravel, and has good elasticity and shock absorption performance. It can absorb the impact force generated by equipment vibration and tubing collision during downhole operations, reducing equipment maintenance costs and operational risks.

[0029] Working principle: When the hollow rod 1 moves upward, it drives the pull rod 9, the coupling rod 3, and the piston 10 to move upward. At this time, the space below the piston 10 increases, and the pressure decreases. Under the action of the bottom hole pressure, crude oil enters the space below the piston 10 through the oil guide groove 8 channel on the fixed coupling 16. At the same time, due to the gap between the piston 10 and the rod, crude oil can also enter the space above the piston 10 through this gap. The valve ball 6 on the lower end of the hydraulic valve sleeve will close the lower end of the oil guide groove 8 under the action of crude oil pressure to prevent crude oil backflow. When the hollow rod 1 moves downward, it drives the pull rod 9, the coupling rod 3, and the piston 10 to move downward. At this time, the space below the piston 10 decreases, and the pressure increases. The crude oil is squeezed and flows upward through the oil guide groove 8 on the piston 10 and the channel around the cross retainer at the lower end of the coupling rod 3. When the crude oil pressure is sufficient to overcome the resistance of the fixed valve seat 5, the crude oil will push open the fixed valve seat 5 and enter the inner channel 13 of the hollow rod 1. In the inner and outer channels 14, the crude oil is finally transported to the ground. The inner wall of the hollow rod 1 has an inner channel 13, and the outer wall has an outer channel 14. These two channels can be used to circulate the heating medium in the inner channel 13 and the outer channel 14, transferring heat to the hollow rod 1 and the crude oil therein, reducing the viscosity of the crude oil, improving the flowability of the crude oil, and thus facilitating the extraction and transportation of crude oil. The piston 10 acts as a one-way valve. When the piston 10 moves upward, the valve ball 6 closes the oil guide groove 8 to prevent the crude oil from flowing back. When the piston 10 moves downward, the valve ball 6 opens under the pressure of the crude oil, allowing the crude oil to flow upward. The fixed valve seat 5 controls the process of crude oil entering the inner channel 13 and the outer channel 14 from the space above the piston 10. Only when the crude oil pressure below the piston 10 is large enough can the fixed valve seat 5 be opened to realize the discharge of crude oil. This avoids the problem of the existing heavy oil energy-saving pump's connection port being a smooth surface, which is not conducive to rotation and thus causes inconvenience to subsequent use and installation.

[0030] A sealing gasket 2 is fixedly connected to the bottom of the outer wall of the hollow rod 1. The sealing gasket 2 is made of high-performance rubber material and is integrally molded. The annular structure fits tightly to the outer contour of the hollow rod 1, ensuring seamless connection with external equipment. The surface of the sealing gasket 2 is evenly distributed with anti-slip texture, which can effectively increase friction and prevent displacement during assembly. An oil-resistant fiber mesh layer is also embedded inside, which enhances the resistance to high temperature, high pressure and corrosive media while ensuring sealing performance. The sealing gasket 2 can isolate liquid leakage from the inner and outer channels 14 of the hollow rod 1, prevent crude oil and heating medium from overflowing from the bottom of the rod, and prevent external impurities and mud from entering the interior of the rod, ensuring the stable operation of the double hollow rod pump heating system and extending the service life of the equipment.

[0031] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model 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 utility model should be included within the protection scope of the present utility model.

Claims

1. A double hollow rod pump heating system, comprising a hollow rod body (1), characterized in that: A pump cylinder (12) is installed on the inner wall of the hollow rod (1). Inside the pump cylinder (12) is a pull rod (9) connected to the rod. The pull rod (9) has a coupling pull rod (3) and an oil guide groove (8) at the connection between the coupling pull rod (3) and the piston (10). There is a gap between the inside of the piston (10) and the pull rod to allow crude oil to flow. The lower end of the piston (10) has a pump rod on the pull rod (9). There is a fixed coupling (16) at the connection. The fixed coupling (16) has an oil guide groove (8) channel. The lower end of the coupling pull rod (3) has a cross. The piston (10) has a hydraulic valve sleeve on the lower pump rod. The upper end of the valve sleeve has a plum blossom-shaped oil guide groove (8). The lower end of the oil guide groove (8) is fixed with a valve ball (6). The lower end of the locking valve hydraulic valve sleeve with a groove is sealed with a cross-shaped notch on the lower rod. The lower end of the piston (10) has a slotted notch. The inner wall of the hollow rod (1) has an inner channel (13). The outer wall of the inner channel (13) has an outer channel (14). The upper middle part of the inner wall of the hollow rod (1) is equipped with a fixed valve seat (5).

2. The double hollow rod pump heating system according to claim 1, characterized in that: A sealing gasket (2) is fixedly connected to the bottom of the outer wall of the hollow rod (1).

3. The double hollow rod pump heating system according to claim 1, characterized in that: The hollow rod (1) has a retaining ring (4) installed on its inner wall.

4. The double hollow rod over-pump heating system according to claim 1, characterized in that: A sand guide (7) is installed on the inner wall of the hollow rod (1).

5. The double hollow rod over-pump heating system according to claim 1, characterized in that: A fixed tie rod (11) is installed on the inner wall of the hollow rod (1).

6. The double hollow rod pump heating system according to claim 1, characterized in that: The outer wall of the hollow rod (1) is fitted with a protective sleeve (15).

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