High-temperature thickened oil submersible linear motor and high-temperature thickened oil well exploitation equipment

Abstract

The application discloses a high-temperature heavy oil submersible linear motor, which comprises a stator, a mover and a sliding guide sleeve arranged coaxially, the sliding guide sleeve is fixedly arranged in the cavity in the center of the stator, the mover passes through the center hole of the sliding guide sleeve and can axially move relative to the stator and the sliding guide sleeve, the sliding guide sleeve comprises a sleeve structure guide sleeve seat, the outer side surface of the guide sleeve seat is in contact with and fixed relative to the inner side surface of the stator, the inner side surface of the guide sleeve seat is metallurgically combined with a hard alloy layer, the hard alloy layer is in contact with and slides relative to the outer side surface of the mover, a plurality of cutting gaps are arranged around the center on the guide sleeve seat, and the cutting gaps divide the inner side surface of the guide sleeve seat and the hard alloy layer in the circumferential direction. The radial limiting capacity of the mover is ensured, large thermal stress of the joint surface of the hard alloy layer and the guide sleeve seat under high temperature can be avoided, the hard alloy layer is prevented from peeling off, and the reliability and stability of the equipment are improved. The application further discloses a high-temperature heavy oil well exploitation equipment comprising the high-temperature heavy oil submersible linear motor.

Description

Technical Field

[0001] This invention relates to the field of heavy oil extraction, and in particular to a high-temperature heavy oil submersible linear motor. Furthermore, this invention also relates to a high-temperature heavy oil well extraction device including the aforementioned motor. Background Technology

[0002] Heavy oil is one of the important future energy alternatives, possessing advantages such as high viscosity and large reserves, but its extraction is highly challenging. One current extraction method involves injecting high-temperature, high-pressure steam into the well and maintaining it for a period of time—a process known as "steam well sealing"—to reduce the viscosity of the heavy oil at high temperatures, after which it can be extracted. The temperature of this high-temperature steam is extremely high, reaching up to 370°C, posing a significant challenge to the oil extraction equipment.

[0003] In existing technologies, reciprocating submersible electric pumps are generally used for oil extraction. The power unit is a submersible linear motor, a cylindrical linear motor. The mover is located at the center of the cylinder and moves reciprocally along the cylinder's axis. The stator is annular and fits around the mover. To ensure that the mover's movement does not wear down the stator, a sliding guide sleeve is installed inside the stator to radially limit the mover. The sliding guide sleeve consists of a guide sleeve seat and an inner alloy layer, which are fixed by an interference fit. The alloy layer is made of a brittle material with a very low coefficient of thermal expansion, while the guide sleeve seat is generally made of stainless steel with a higher coefficient of thermal expansion. In high-temperature wells, due to the significant temperature difference between the ambient and surface temperatures, if the interference fit between the guide sleeve seat and the alloy layer is small, a large gap will exist between them downhole, causing the sliding guide sleeve to lose its fixation and weakening its limiting effect on the mover. If the interference fit between the guide sleeve seat and the alloy layer is large, the internal stress of the sliding guide sleeve will be too high, making it prone to breakage.

[0004] Therefore, how to provide a high-temperature heavy oil submersible linear motor that can guarantee the limiting function and prevent breakage is a technical problem that needs to be solved by those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to provide a high-temperature heavy oil submersible linear motor, in which the guide sleeve and the hard alloy layer are integrally formed by metallurgical bonding to ensure the limiting effect on the mover. Excessive thermal stress is avoided by dividing the inner surface of the guide sleeve and the hard alloy layer through a cutting gap. Another purpose of this invention is to provide a high-temperature heavy oil well extraction device including the above-mentioned high-temperature heavy oil submersible linear motor.

[0006] To solve the above-mentioned technical problems, the present invention provides a high-temperature heavy oil submersible linear motor, including a stator, a mover, and a sliding guide sleeve arranged coaxially. The sliding guide sleeve is fixedly disposed in a cavity at the center of the stator. The mover passes through the central hole of the sliding guide sleeve and is axially movable relative to the stator and the sliding guide sleeve. The sliding guide sleeve includes a guide sleeve seat with a sleeve structure. The outer side of the guide sleeve seat contacts and is relatively fixed to the inner side of the stator. The inner side of the guide sleeve seat is metallurgically bonded with a hard alloy layer. The hard alloy layer contacts and slides relative to the outer side of the mover. The guide sleeve seat is provided with a plurality of cutting slits arranged around the center. The cutting slits circumferentially divide the inner side of the guide sleeve seat and the hard alloy layer.

[0007] Preferably, the guide sleeve seat is a cylindrical sleeve structure, the depth direction of the cutting slit is the radial direction of the guide sleeve seat, and the length direction of the cutting slit is the axial direction of the guide sleeve seat.

[0008] Preferably, the plurality of cutting slits are evenly distributed along the inner circumferential side of the guide sleeve seat.

[0009] Preferably, the two ends of the cutting slit are located on the two end faces of the guide sleeve and the cemented carbide layer, the inner opening of the cutting slit is located on the inner side of the cemented carbide layer, and the bottom of the cutting slit is located inside the guide sleeve.

[0010] Preferably, the cutting slit is formed by wire cutting.

[0011] Preferably, it includes a plurality of sliding guide sleeves, which are sequentially installed along the axis inside the hollow center of the stator.

[0012] Preferably, the upper end of the stator is connected to an upper connecting pipe and a lead wire, and the lower end of the stator is connected to a lower connecting pipe.

[0013] Preferably, the depth of the cutting slit is greater than or equal to half the thickness from the outer side to the inner side of the sliding guide sleeve.

[0014] Preferably, the spacing between adjacent cutting slits is less than or equal to three times the thickness of the cemented carbide layer.

[0015] The present invention provides a high-temperature heavy oil well extraction device, comprising a high-temperature heavy oil submersible linear motor as described in any one of the above claims.

[0016] This invention provides a high-temperature heavy oil submersible linear motor, comprising a stator, a mover, and a sliding guide sleeve arranged coaxially. The sliding guide sleeve is fixedly disposed in a cavity at the center of the stator. The mover passes through the central hole of the sliding guide sleeve and is axially movable relative to the stator and the sliding guide sleeve. The sliding guide sleeve includes a guide sleeve seat with a sleeve structure. The outer side of the guide sleeve seat contacts and is relatively fixed to the inner side of the stator. The inner side of the guide sleeve seat is metallurgically bonded with a hard alloy layer. The hard alloy layer contacts and slides relative to the outer side of the mover. The guide sleeve seat is provided with multiple cutting slits arranged around the center. The cutting slits divide the inner side of the guide sleeve seat and the hard alloy layer circumferentially.

[0017] The cemented carbide layer is integrally formed with the guide sleeve seat through metallurgical bonding. Even under significant temperature variations, no gaps will form between the cemented carbide layer and the guide sleeve seat, ensuring the radial limiting capability of the mover. Furthermore, by setting cutting slits and controlling their depth and spacing, large thermal stresses can be avoided at the interface between the cemented carbide layer and the guide sleeve seat at high temperatures, preventing the cemented carbide layer from peeling off and improving the reliability and stability of the equipment.

[0018] The present invention also provides a high-temperature heavy oil well extraction device including the above-mentioned high-temperature heavy oil submersible linear motor. Since the above-mentioned high-temperature heavy oil submersible linear motor has the above-mentioned technical effects, the above-mentioned high-temperature heavy oil well extraction device should also have the same technical effects, and will not be described in detail here. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a specific embodiment of the high-temperature heavy oil submersible linear motor provided by the present invention.

[0020] Figure 2 This is a top view of the sliding guide sleeve in a specific embodiment of the high-temperature heavy oil submersible linear motor provided by the present invention. Detailed Implementation

[0021] The core of this invention is to provide a high-temperature heavy oil submersible linear motor. The guide sleeve and the hard alloy layer are integrally formed through metallurgical bonding to ensure the limiting effect on the mover. Excessive thermal stress is avoided by dividing the inner surface of the guide sleeve and the hard alloy layer through a cutting gap. Another core aspect of this invention is to provide a high-temperature heavy oil well extraction device including the aforementioned high-temperature heavy oil submersible linear motor.

[0022] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] Please refer to Figure 1 and Figure 2 , Figure 1This is a schematic diagram of a specific embodiment of the high-temperature heavy oil submersible linear motor provided by the present invention. Figure 2 This is a top view of the sliding guide sleeve in a specific embodiment of the high-temperature heavy oil submersible linear motor provided by the present invention.

[0024] This invention provides a high-temperature heavy oil submersible linear motor, comprising a stator 1, a mover 2, and a sliding guide sleeve 3 arranged coaxially. The stator 1 is a sleeve structure with an internal cavity. The sliding guide sleeve 3 is a sleeve structure with a central hole. The mover is a rod structure. The diameters of the stator 1, sliding guide sleeve 3, and mover 2 gradually decrease, and they are sequentially fitted together. The sliding guide sleeve 3 is fixedly disposed within the central cavity of the stator 1, and is relatively fixed to the stator 1. The mover 2 passes through the central hole of the sliding guide sleeve 3 and can move axially relative to the stator 1 and the sliding guide sleeve 3, i.e., the sliding guide sleeve 3 is located between the stator 1 and the mover 2. The side of each component facing the center is the inner side, and the side away from the center is the outer side. Specifically, the upper end of the stator 1 is connected to the upper connecting pipe 4 and the lead wire 5, and the lower end of the stator 1 is connected to the lower connecting pipe 6. The upper connecting pipe 4 is connected to the stator 1 by means of thread or welding. The lead wire 5 extends from the upper end of the stator 1 to form a linear motor. The mover 2 shuttles through the internal cavity of the stator 1. The sliding guide sleeve 3 is located in the stator 1 and is used to radially limit the mover 2. The lower connecting pipe 6 is connected to the stator 1 by means of thread or welding.

[0025] The sliding guide sleeve 3 has a double-layer sleeve structure, including a guide sleeve base 31 and a hard alloy layer 32. The guide sleeve base 31 is also a sleeve structure. The outer surface of the guide sleeve base 31 contacts and is relatively fixed to the inner surface of the stator 1. The inner surface of the guide sleeve base 31 is metallurgically bonded with the hard alloy layer 32. The inner surface of the hard alloy layer 32 contacts and slides relative to the outer surface of the mover 2. That is, the outer layer of the sliding guide sleeve 3 is the guide sleeve base 31, and the inner surface is the hard alloy layer 32. The outer surface of the hard alloy layer 32 and the inner surface of the guide sleeve base 31 are stably connected by a metallurgical structure, making the two an integral unit. Furthermore, multiple cutting slits 33 are provided in the guide sleeve base 31 and the hard alloy layer 32. Each cutting slit 33 completely cuts the hard alloy layer 32 and partially cuts the part of the guide sleeve base 31 near the inner surface. Multiple cutting slits 33 are arranged around the center and distributed circumferentially along the hard alloy layer 32, that is, the cutting slits 33 divide the inner side of the guide sleeve seat 31 and the hard alloy layer 32 circumferentially.

[0026] The specific processing method involves first forming an integral sleeve structure with the guide sleeve seat 31 through metallurgical bonding, with the inner surface of the sleeve structure being a cemented carbide layer 32. After the integral formation, wire cutting is used to cut the inner surface of the sliding guide sleeve 31 sleeve structure, forming a cutting slit 33. During the cutting process, the wire cut first completely penetrates the inner and outer surfaces of the cemented carbide layer 32, and then cuts outward from the inner surface of the guide sleeve seat 31 until a certain depth is reached, ensuring the integrity of the guide sleeve seat 31. The guide sleeve seat 31 is generally made of stainless steel, and the cemented carbide layer 32 is made of materials such as nickel-chromium alloy, chromium carbide alloy, high-manganese alloy, tungsten carbide alloy, or nickel-tungsten alloy. Other materials or cutting methods, such as laser cutting, can also be used, all within the scope of protection of this invention.

[0027] The cemented carbide layer 32 is integrally formed with the guide sleeve seat 31 through metallurgical bonding. Under conditions of large ambient temperature variations, no gap will form between the cemented carbide layer 32 and the guide sleeve seat 31, ensuring the ability to radially limit the movement of the mover 2. Furthermore, by setting the cutting slits 33 and controlling their depth and spacing, large thermal stress can be avoided at the joint surface between the cemented carbide layer 32 and the guide sleeve seat 31 at high temperatures, preventing the cemented carbide layer 32 from peeling off and improving the reliability and stability of the equipment.

[0028] Specifically, to accommodate the shapes of the stator 1 and the mover 2, the guide sleeve 31 is a cylindrical sleeve structure. The depth direction of the cutting slit 33 is the radial direction of the guide sleeve 31, and the length direction of the cutting slit 33 is the axial direction of the guide sleeve 31. Furthermore, multiple cutting slits 33 are evenly distributed along the inner circumferential side of the guide sleeve 31. This uniform radial distribution of the cutting slits 33 improves the overall strength and stability of the component. The layout and shape can also be adjusted as needed, all of which are within the scope of protection of this invention.

[0029] Preferably, the two ends of the cutting slit 33 are located on the two end faces of the guide sleeve seat 31 and the cemented carbide layer 32, the inner opening of the cutting slit 33 is located on the inner side of the cemented carbide layer 32, and the bottom of the cutting slit 33 is located inside the guide sleeve seat 31.

[0030] Based on the lengths of stator 1 and mover 2, multiple sliding guide sleeves 3 can be installed sequentially along the axis inside the hollow center of stator 1.

[0031] Based on the high-temperature heavy oil submersible linear motors provided in the above specific embodiments, the depth of the cutting slit 33 is greater than or equal to half the thickness from the outer to the inner side of the sliding guide sleeve 3. That is, the thickness of the sliding guide sleeve 3 is obtained by dividing the difference between the outer diameter and the inner diameter of the sliding guide sleeve 3 by two, and the depth of the cutting slit 33 is greater than or equal to half the thickness of the sliding guide sleeve 3. The spacing between adjacent cutting slits 33 is less than or equal to three times the thickness of the cemented carbide layer 32, and the thickness of the cemented carbide layer 32 is obtained by dividing the difference between the outer diameter and the inner diameter of the cemented carbide layer 32 by two. The above dimensional parameters are preferred values ​​to ensure normal operation and reduce thermal stress. The dimensional parameters can also be adjusted according to changes in material, shape, and working environment, all of which are within the protection scope of this invention.

[0032] In addition to the aforementioned high-temperature heavy oil submersible linear motor, a specific embodiment of the present invention also provides a high-temperature heavy oil well extraction device including the aforementioned high-temperature heavy oil submersible linear motor. For the structure of other parts of the high-temperature heavy oil well extraction device, please refer to the prior art, which will not be repeated here.

[0033] The high-temperature heavy oil submersible linear motor and high-temperature heavy oil well extraction equipment provided by this invention have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. It should be noted that those skilled in the art can make several improvements and modifications to this invention without departing from the principles of this invention, and these improvements and modifications also fall within the protection scope of the claims of this invention.

Claims

1. A high-temperature heavy oil submersible linear motor, comprising a stator (1), a mover (2), and a sliding guide sleeve (3) arranged coaxially, wherein the sliding guide sleeve (3) is fixedly disposed in a cavity at the center of the stator (1), and the mover (2) passes through the central hole of the sliding guide sleeve (3) and is axially movable relative to the stator (1) and the sliding guide sleeve (3), characterized in that, The sliding guide sleeve (3) includes a guide sleeve seat (31) with a sleeve structure. The outer side of the guide sleeve seat (31) contacts and is fixed relative to the inner side of the stator (1). The inner side of the guide sleeve seat (31) is metallurgically bonded with a hard alloy layer (32). The inner side of the hard alloy layer (32) contacts and slides relative to the outer side of the mover (2). The guide sleeve seat (31) is provided with a plurality of cutting slits (33) arranged around the center. The cutting slits (33) divide the inner side of the guide sleeve seat (31) and the hard alloy layer (32) in the circumferential direction to avoid large thermal stress generated at the joint surface of the hard alloy layer (32) and the guide sleeve seat (31) at high temperature, and to prevent the hard alloy layer (32) from peeling off. The guide sleeve (31) is a cylindrical sleeve structure. The depth direction of the cutting slit (33) is the radial direction of the guide sleeve (31), and the length direction of the cutting slit (33) is the axial direction of the guide sleeve (31). The plurality of cutting slits (33) are evenly arranged along the inner circumferential side of the guide sleeve (31); The two ends of the cutting slit (33) are located on the two end faces of the guide sleeve (31) and the hard alloy layer (32), the inner opening of the cutting slit (33) is located on the inner side of the hard alloy layer (32), and the bottom of the cutting slit (33) is located inside the guide sleeve (31). The depth of the cutting slit (33) is greater than or equal to half the thickness of the sliding guide sleeve (3) from the outer side to the inner side; The spacing between adjacent cutting gaps (33) is less than or equal to three times the thickness of the hard alloy layer (32).

2. The high-temperature heavy oil submersible linear motor according to claim 1, characterized in that, The cutting slit (33) is formed by wire cutting.

3. The high-temperature heavy oil submersible linear motor according to claim 1, characterized in that, It includes multiple sliding guide sleeves (3), which are installed sequentially along the axis inside the hollow center of the stator (1).

4. The high-temperature heavy oil submersible linear motor according to claim 1, characterized in that, The upper end of the stator (1) is connected to an upper connecting pipe (4) and a lead wire (5), and the lower end of the stator (1) is connected to a lower connecting pipe (6).

5. A high-temperature heavy oil well extraction device, characterized in that, Including the high-temperature heavy oil submersible linear motor as described in any one of claims 1 to 4.

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