Electric submersible pump protector and manufacturing method and related application thereof

Abstract

The invention discloses an electric submersible pump protector and a preparation method and related application thereof. A protector shaft of the protector rotates under external force. The axial force balancing piece comprises a slip block bearing disc, a rotor bearing disc, a plurality of slip blocks arranged on the slip block bearing disc and a plurality of connecting pieces connecting the slip blocks and the slip block bearing disc. Matching grooves are formed in the two opposite side walls of the slip blocks, and the connecting pieces and the slip blocks are arranged at intervals. One end of the connecting piece is connected with the slip block bearing disc, and the other end of the connecting piece is provided with a matching block matched with the matching groove so as to axially limit the slip block and enable the slip block to move in the radial direction under the action of the radial force of the protector shaft. The rotor carrying disc is driven by the protector shaft to rotate relative to the slip block so that axial force borne by the protector can be transmitted to the slip carrying disc through rotating fit between the slip block and the rotor carrying disc, and coatings are arranged on the first end face of the slip block and the second end face of the rotor carrying disc. The bearing capacity and the temperature resistance of the protector can be improved.

Description

Technical Field

[0001] This invention relates to the field of submersible electric pump oil extraction technology, and in particular to a submersible electric pump protector, its manufacturing method, and related applications. Background Technology

[0002] As a crucial component of submersible electric pumps (SAPs), the protector plays a vital role in balancing the pressure inside and outside the motor, bearing the axial force of the centrifugal pump, and connecting the motor and separator to transmit power to the centrifugal pump during operation. In existing technologies, the axial force is primarily borne by the cooperating static pressure-bearing module and dynamic follow-up module within the protector. With the increasing intensity of oil and gas exploration and development, 80% of newly discovered oil and gas resources are located in deep and ultra-deep formations. The number of ultra-deep / extra-deep wells being drilled is constantly increasing. Currently, there are over 200 ultra-deep wells, with over 50 ultra-deep / extra-deep wells exceeding 8000 meters already drilled, and some reaching depths of over 10,000 meters.

[0003] To achieve the lifting capacity of electric submersible pumps (ESPs) for ultra-deep / extremely deep wells, the lifting capacity needs to reach over 6000m. This means that the axial force from the centrifugal pump will be greatly increased, and the downhole conditions will become more severe with increasing well depth. This requires ESPs to have better corrosion resistance and high-temperature resistance, which in turn requires high-load-bearing ESP protectors with higher load-bearing capacity and temperature resistance to ensure the continued operation of ESPs. Therefore, how to improve the load-bearing capacity of protectors in high-temperature environments is an urgent problem to be solved in existing technologies. Summary of the Invention

[0004] In view of the above problems, the present invention is proposed to provide a submersible electric pump protector, a manufacturing method thereof, and related applications that overcome or at least partially solve the above problems.

[0005] In a first aspect, embodiments of the present invention provide a submersible electric pump protector, comprising: a housing, a protector shaft disposed within the housing, a mechanical seal disposed within the housing and sequentially disposed from top to bottom outside the protector shaft, a centering bearing, a bladder chamber, a settling chamber, an axial force balancing component, and a filter chamber;

[0006] The protector shaft is used to rotate under the influence of an external force;

[0007] The axial force balancing component includes: a slip block support plate, a moving part support plate, multiple slip blocks correspondingly disposed in grooves on the slip block support plate, and multiple connectors for connecting the slip blocks and the slip block support plate;

[0008] The slip block has mating grooves on its opposite side walls, and the connector is spaced apart from the slip block.

[0009] One end of the connector is connected to the slip block bearing plate, and the other end is provided with a mating block. The mating block is used to mate with the mating groove to axially limit the slip block and allow the slip block to swing relative to the slip block bearing plate under the squeezing force of the protector shaft.

[0010] The movable carrier plate is used to rotate relative to the slip block under the drive of the protector shaft and to cooperate with the end face of the slip block, so as to transmit the axial force borne by the protector to the slip block carrier plate through the rotational cooperation between the slip block and the movable carrier plate. The first end face of the slip block and the second end face of the movable carrier plate are provided with a coating sintered thereon by a sintering process. The first end face is the end face of the slip block that cooperates with the movable carrier plate, and the second end face is the end face of the movable carrier plate that cooperates with the slip block. The material of the coating is a material with a friction coefficient of not more than 0.3, a hardness of not less than 6000HV, and a thermal conductivity of not less than 500W / mk.

[0011] In an optional embodiment, the mating groove is an arc-shaped groove, and the sidewall of the mating block is set as an arc surface;

[0012] The sidewall of the mating block extends into the arc-shaped groove to axially limit the slip block, and the arc surface of the mating block is in clearance fit with the arc-shaped groove so that the slip block swings relative to the slip block bearing plate under the extrusion force of the protector shaft.

[0013] In an optional embodiment, the coating material is polycrystalline diamond.

[0014] In an optional embodiment, the slip blocks are evenly distributed circumferentially on the end face of the slip block bearing disk.

[0015] In an optional embodiment, the connector is a round-headed bolt;

[0016] Accordingly, the bearing plate of the slip block is provided with bolt holes that mate with the round head bolt, and the mating block at the other end of the connector is a round head structure of the round head bolt.

[0017] In an optional embodiment, during the sintering process, the coating material is specifically sintered on the first end face of the chuck block and the second end face of the moving carrier disk at a sintering temperature of 800-1500°C.

[0018] Based on the same inventive concept, this invention also provides a method for preparing the above-mentioned submersible pump protector, characterized in that it includes:

[0019] Obtain the slip block support plate substrate, and mill multiple connecting holes for mating with the connectors on the slip block support plate substrate to obtain the prepared slip block support plate;

[0020] The pre-selected coating material is sintered at a preset sintering temperature onto the first surface of the acquired slip block substrate and the second surface of the acquired rotor carrier disk substrate. The first surface is the surface of the slip block used to mate with the rotor carrier disk, and the second surface is the surface of the rotor carrier disk used to mate with the slip block. The coating material is a material with a friction coefficient of not more than 0.3, a hardness of not less than 6000HV, and a thermal conductivity of not less than 500W / mk.

[0021] The surfaces of the sintered coating material on the slip blocks and the surfaces of the sintered coating material on the rotor carrier are ground and polished to achieve the preset surface finish and flatness requirements.

[0022] The prepared slip blocks are installed on the prepared slip block bearing plate using the connecting parts to complete the preparation of the axial force balancing component of the submersible electric pump protector.

[0023] In an optional embodiment, the preparation method provided by the present invention further includes:

[0024] After obtaining the axial force balance component of the submersible electric pump protector, a temperature and pressure resistance test is conducted on the axial force balance component.

[0025] The axial force balancing component that achieves temperature and pressure resistance, as well as the mechanical seal, centering bearing, bladder chamber, settling chamber, and filter chamber of the pre-acquired submersible pump protector, are installed on the protector shaft of the submersible pump in a preset installation sequence to obtain the installed protector.

[0026] Adjust the axial force balance component of the installed protector by adjusting the displacement, and check the shaft of the installed protector by inspecting the disc.

[0027] After the protector disc shaft passes inspection, a whole-machine airtightness test is conducted on the protector to obtain a protector that meets the preset requirements.

[0028] In an optional embodiment, when the pre-selected coating material is polydiamond, the preset sintering temperature range during the coating sintering process is 800-1500℃.

[0029] Based on the same inventive concept, this invention also provides an application of the above-mentioned submersible pump protector in the field of oilfield production.

[0030] The beneficial effects of the above-described technical solutions provided in the embodiments of the present invention include at least the following:

[0031] The submersible electric pump protector provided in this embodiment of the invention includes: a housing, a protector shaft disposed within the housing, a mechanical seal disposed within the housing and sequentially disposed from top to bottom outside the protector shaft, a centering bearing, a bladder chamber, a settling chamber, an axial force balancing component, and a filter chamber; wherein, the axial force balancing component includes: a slip block, a slip block support plate, a mover support plate, a plurality of slip blocks disposed on the slip block support plate, and a plurality of connecting components for connecting the slip blocks and the slip block support plate; This submersible electric pump protector has a moving carrier plate that rotates relative to the slip block under the drive of the protector shaft and mates with the end face of the slip block. The axial force borne by the protector is transmitted to the slip block carrier plate through the rotational engagement between the slip block and the moving carrier plate. A coating is provided on both the end face of the slip block that mates with the moving carrier plate and the end face of the moving carrier plate that mates with the slip block. The coating material has a coefficient of friction not greater than 0.3, a hardness not less than 6000 HV, and a thermal conductivity not less than 500 W / mk. In other words, a coating is provided on the mating surface between the slip block and the moving carrier plate. This coating has high hardness, a low coefficient of friction, and high thermal conductivity. This high thermal conductivity and low coefficient of friction allow for better contact between the slip block and the moving carrier plate. When the rotating fit is used to bear axial force, heat generation and functional loss can be reduced. This reduces the likelihood of high-temperature welding at the mating surfaces between the slip block and the moving carrier plate during startup and shutdown, which can lead to decreased gloss and increased wear and scratches during rotational mating. Furthermore, the high hardness of the coating allows the axial force balancer to withstand large axial loads and reduces the possibility of damage from impact loads. It also resists abrasion from downhole fluids, improving the temperature resistance and load-bearing capacity of the protector, thus better meeting the requirements of ultra-deep / extremely deep well submersible pumps. Additionally, the coating is sintered onto the first and second end faces, enhancing the bonding strength between the coating and the slip block and moving carrier plate substrates.

[0032] Furthermore, in the protector provided in this embodiment of the invention, the axial force balancing component has mating grooves on opposite side walls of the slip block, and the other end of the connector has a mating block that mates with the mating grooves. The mating of the mating block and the mating grooves allows the slip block to swing relative to the slip block bearing plate under the extrusion force of the protector shaft. Compared to a static structure of the slip block, in actual application, if the protector shaft deflects and extrudes the slip block, the slip block can swing circumferentially based on the mating between the mating block and the mating grooves to adjust its position, thus preventing the extrusion force of the protector shaft from acting entirely on the slip block, reducing the likelihood of damage to the slip block under the extrusion force of the protector, improving the service life of the axial force balancing component, and consequently improving the service life of the protector.

[0033] The protector provided in this embodiment of the invention improves the temperature resistance, load-bearing capacity, and service life of the protector by designing the structure of the axial force balancing component and by applying a coating on the end face of the slip block of the axial force balancing component that mates with the moving carrier plate and on the end face of the moving carrier plate that mates with the slip block. This allows the protector to better meet the requirements of ultra-deep / extreme deep well submersible pumps.

[0034] Furthermore, other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the written description, claims, and drawings.

[0035] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0036] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0037] Figure 1 This is a schematic diagram of the overall structure of the submersible electric pump protector in an embodiment of the present invention;

[0038] Figure 2 This is a schematic diagram of the axial force balancing component in an embodiment of the present invention;

[0039] Figure 3 This is a schematic diagram of the structure of the moving sub-carrier disk in an embodiment of the present invention;

[0040] Figure 4 This is a schematic diagram of the structure of the slip block bearing plate and the slip block connection state in the axial force balancing component of this invention embodiment;

[0041] Figure 5 for Figure 4 A cross-sectional view along the AA direction;

[0042] Figure 6 This is a schematic flowchart illustrating the preparation method of the submersible electric pump protector in an embodiment of the present invention;

[0043] Figure 7 This is a schematic diagram of the overall process for preparing the submersible electric pump protector in an embodiment of the present invention.

[0044] Explanation of reference numerals in the attached figures:

[0045] 1. Protector shaft; 2. Mechanical seal; 3. Centralizing bearing; 4. Capsule cavity; 5. Settling chamber; 6. Axial force balancing component; 7. Filter chamber;

[0046] 61. Moving carrier plate; 62. Slip block carrier plate; 63. Slip block; 64. Connector; 611. Second end face; 612. Center hole of moving carrier plate; 631. First end face; 632. Mating groove; 641. Mating block. Detailed Implementation

[0047] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0048] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "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 the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0049] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0050] To address the problems existing in the prior art, embodiments of the present invention provide a submersible electric pump protector, its manufacturing method, and related applications.

[0051] It should be noted that in this embodiment... Figures 1 to 5 The diagram below only illustrates the structure of the protector and axial force balancer, with some structures represented by lines. These lines are merely illustrative and do not represent the actual shape of the structure within the protector and axial force balancer. Furthermore, the shapes are also linear. Figure 2 The diagram shown is merely an example of the various parts of the axial force balancer in their mating state. The details of each part are not fully shown. Please refer to other diagrams for a comprehensive understanding.

[0052] The submersible pump protector provided in this embodiment of the invention refers to... Figures 1 to 5 As shown, it includes: a housing, a protector shaft 1 disposed within the housing, a mechanical seal 2 disposed within the housing and arranged sequentially from top to bottom outside the protector shaft 1, a straightening bearing 3, a capsule cavity 4, a settling cavity 5, an axial force balancing component 6, and a filter cavity 7;

[0053] The protector shaft 1 is used to rotate under the influence of an external force;

[0054] The axial force balancing component 6 includes: a slip block 63, a slip block bearing plate 62, a moving part bearing plate 61, a plurality of slip blocks 63 disposed on the slip block bearing plate 62, and a plurality of connecting parts 64 for connecting the slip blocks 63 and the slip block bearing plate 62;

[0055] The slip block 63 has mating grooves 632 on its opposite side walls, and the connector 64 is spaced apart from the slip block 63.

[0056] One end of the connector 64 is connected to the slip block support plate 62, and the other end is provided with a mating block 641. The mating block 641 is used to cooperate with the mating groove 632 to axially limit the slip block 63 and make the slip block 63 swing relative to the slip block support plate 62 under the squeezing force of the protector shaft 1.

[0057] The movable carrier plate 61 is used to rotate relative to the slip block 63 under the drive of the protector shaft 1, and cooperates with the end face of the slip block 63, so as to transmit the axial force borne by the protector to the slip block carrier plate 62 through the rotational cooperation between the slip block 63 and the movable carrier plate 61. The first end face 631 of the slip block 63 and the second end face 611 of the movable carrier plate 61 are provided with a coating sintered thereon by a sintering process. The first end face 631 is the end face of the slip block 63 cooperating with the movable carrier plate 61, and the second end face 611 is the end face of the movable carrier plate 61 cooperating with the slip block 63. The coating material is a material with a friction coefficient of not more than 0.3, a hardness of not less than 6000HV, and a thermal conductivity of not less than 500W / mk.

[0058] Specifically, a groove matching the slip block 63 can be provided on the slip block support plate 62, and the slip block can be specifically set in the groove of the slip block support plate; and refer to Figure 1 and Figure 3 As shown, the moving carrier disk 61 and the protector shaft 1 are fitted together by the wall of the center hole 612 of the moving carrier disk and the outer peripheral surface of the protector shaft 1.

[0059] The submersible pump protector provided in this embodiment of the invention features a high-pressure mechanical seal 2 used to isolate axial fluid during downhole operation. In practical applications, the sealing effect under high pressure can be improved by increasing the sealing pressure rating. A centering bearing 3 provides radial centering for the protector shaft 1, maintaining stable operation of the mechanical seal. The capsule chamber 4 isolates the motor from the well fluid and maintains internal and external pressure balance through a check valve. The settling chamber 5 primarily settles solid particles and delays failure time. The axial force balancing component 6 provides axial force bearing capacity and adjusts shaft stability. The filter chamber 7 primarily filters impurities and friction debris, preventing them from directly entering the motor. During the use of the submersible pump protector, the moving carrier plate 61 rotates at high speed with the protector shaft 1, reaching a speed of about 3000 r / min. The slip block carrier plate 62 remains stationary. During the rotation of the moving carrier plate 61, high-speed friction is generated between the slip block 63 and the moving carrier plate 61. Since the mating surfaces of the slip block 63 and the moving carrier plate 61 are made of a material with a friction coefficient of no more than 0.3, a hardness of no less than 6000 HV, and a thermal conductivity of no less than 500 W / mk (such as a PDC material coating), its friction coefficient is low, heat generation is low, thermal conductivity is good, and hardness is high, which can fully meet the requirements of the downhole operating environment. Furthermore, due to the high flexibility of the slip block 63, it can swing slightly along the slip block bearing plate 62 under the pressure of the protector shaft 1, thereby adjusting the state of the protector shaft 1, reducing the occurrence of the protector shaft 1 jamming with the slip block 63 during rotation, and the possibility of the slip block 63 being damaged under the pressure of the protector shaft 1, so as to improve the stability and service life of the protector.

[0060] The submersible electric protector provided in this embodiment of the invention has a mating groove 632 on both sides of the slip block that can be an arc-shaped groove, and the side wall of the mating block 641 is provided with an arc surface;

[0061] The sidewall of the mating block 641 extends into the arc-shaped groove to axially limit the slip block 63. The arc surface of the mating block 641 is in clearance fit with the arc-shaped groove so that the slip block 63 swings relative to the slip block bearing plate 62 under the extrusion force of the protector shaft 1.

[0062] It should be noted that the specific materials of the coatings applied to the first end face 631 and the second end face 611 in this embodiment of the invention are not specifically limited. They can be selected according to actual needs, as long as they meet the requirements of a friction coefficient not greater than 0.3, a hardness not less than 6000HV, and a thermal conductivity not less than 500W / mk. Optionally, the coating material applied to the first end face 631 and the second end face 611 in this embodiment of the invention can be polycrystalline diamond (PDC). Polycrystalline diamond has high thermal conductivity, which can reduce local extreme temperature conditions that lead to degradation of the axial force balancing component. Especially during the start-up and shutdown phases, high thermal conductivity can reduce the possibility of local welding of the axial force balancing component and can adapt to the high-temperature downhole conditions of ultra-deep / ultra-deep wells of 150℃-350℃. This avoids the situation where the slips become locally welded in a high-temperature environment, resulting in scratches and wear on the surface of the moving carrier disk when they mate with it. Furthermore, polycrystalline diamond (PCD) possesses extremely high wear resistance and a low coefficient of friction, with a coefficient of friction of only 0.1-0.3, approximately 30% of that of conventional cemented carbide. This reduces heat generation and power loss when the slips and mover carrier plate mate, and it exhibits excellent chemical stability. In addition, PCD has extremely high hardness and fracture toughness, allowing the axial force balancer to withstand large axial loads and reducing the likelihood of damage from impact loads. It also resists abrasion from downhole fluids. A PDC coating is applied to the mating surfaces of the slips and mover carrier plate, ensuring the protector meets the requirements of ultra-deep / extremely deep well submersible pumps. Moreover, PCD material has a high temperature resistance, reaching up to 750℃, fully meeting the requirements of the downhole operating environment. Therefore, when PCD is chosen as the coating material, its high chemical stability, resistance to chemical corrosion, anti-adhesion properties, extremely high wear resistance, and good heat resistance are crucial guarantees for the stable operation of the protector.

[0063] In an optional embodiment, the slip blocks 63 are evenly distributed circumferentially on the end face of the slip block support plate 62.

[0064] In an optional embodiment, the connector 64 in the submersible electric pump protector provided by the present invention can be a round-head bolt; correspondingly, the slip block bearing plate 62 is provided with bolt holes that mate with the round-head bolt, and the mating block 641 at the other end of the connector 64 is a round-head structure of the round-head bolt; that is, the submersible electric pump provided by the present invention can use a conventional round-head bolt as the connector 64, and without designing an additional connector structure, the connection between the slip block and the slip block bearing plate is achieved by the round-head bolt, thereby enabling the slip block to swing relative to the slip block bearing plate.

[0065] In an optional embodiment, the submersible pump protector provided by this invention has a coating obtained by sintering the coating material onto the first end face 631 of the slip block and the second end face 611 of the mover carrier plate at a preset sintering temperature. That is, this invention innovatively sintersperses the coating material onto the slip block substrate and the mover carrier plate substrate through a sintering method, thereby ensuring a strong bond between the coating and the slip block substrate and the mover carrier plate substrate.

[0066] Furthermore, regarding the submersible electric pump protector provided in the embodiments of the present invention, the inventors of this application discovered in their research that when the selected coating material is polycrystalline diamond, the preset sintering temperature can be selected as 800-1500℃. When the selected temperature is lower than this temperature range, the polycrystalline diamond material is difficult to sinter on the slip block substrate and the mover carrier disk substrate. When the temperature is higher than this temperature range, the excessively high temperature will damage the slip block substrate and the mover carrier disk substrate.

[0067] Based on the same inventive concept, this invention also provides a method for preparing the above-mentioned submersible electric pump protector, the flowchart of which is shown below. Figure 5 As shown, it includes the following steps:

[0068] Step S101: Obtain the slip block support plate substrate, and mill multiple connecting holes for mating with the connector on the slip block support plate substrate to obtain the prepared slip block support plate;

[0069] Step S102: The pre-selected coating material is sintered onto the first surface of the acquired slip block substrate and the second surface of the acquired rotor carrier disk substrate at a preset sintering temperature. The first surface is the surface of the slip block used to mate with the rotor carrier disk, and the second surface is the surface of the rotor carrier disk used to mate with the slip block. The coating material is a material with a friction coefficient of not more than 0.3, a hardness of not less than 6000HV, and a thermal conductivity of not less than 500W / mk. Specifically, the slip block substrate and the rotor carrier disk substrate are substrate structures that have been milled with corresponding shapes and corresponding grooves or holes, with only the coating not yet completed.

[0070] Step S103: Grind and polish the surfaces of the sintered coating material on the slip blocks and the rotor carrier disk to achieve the preset surface finish and flatness requirements.

[0071] Step S104: Use the connector to install the prepared slip block onto the prepared slip block bearing plate to complete the preparation of the axial force balancing component of the submersible electric pump protector.

[0072] The method for preparing the submersible electric pump protector according to this invention involves, during the preparation of the axial force balancing component, after obtaining the slip block bearing plate substrate, milling a connecting hole matching the slip block. After obtaining the slip block, a connector is used to install the prepared slip block onto the prepared slip block bearing plate. Compared to a one-piece structure produced by casting, this method avoids porosity caused by casting and improves the strength of the slip block and the slip block bearing plate. Optionally, when the slip block is placed within a groove in the slip block bearing plate, a groove matching the slip block is also milled into the slip block bearing plate substrate.

[0073] In this embodiment of the invention, the slip block bearing disk substrate, the slip block substrate, and the moving carrier disk substrate can specifically be alloy steel substrates.

[0074] In this embodiment of the invention, when grinding and polishing the first surface of the slip block and the second surface of the moving carrier disk, the flatness and smoothness achieved by the two surfaces are not specifically limited. They can be selected according to actual needs. For example, the first surface and the second surface can achieve a flatness of 0.02 mm and a smoothness of 0.3 μm.

[0075] Optionally, the preparation method of the submersible pump protector provided in this embodiment of the invention refers to... Figure 6 The flowchart shown also includes:

[0076] After obtaining the axial force balance component of the submersible electric pump protector, a temperature and pressure resistance test is conducted on the axial force balance component.

[0077] The axial force balancing component that achieves temperature and pressure resistance, as well as the mechanical seal, centering bearing, bladder chamber, settling chamber, and filter chamber of the pre-acquired submersible pump protector, are installed on the protector shaft of the submersible pump in a preset installation sequence to obtain the installed protector.

[0078] Adjust the axial force balance component of the installed protector by adjusting the displacement, and check the shaft of the installed protector by inspecting the disc.

[0079] After the protector disc shaft passes inspection, a whole-machine airtightness test is conducted on the protector to obtain a protector that meets the preset requirements.

[0080] When installing a single protector, refer to... Figure 1As shown, specifically, firstly, the capsule cavity 4 is installed outside the protector shaft 1. Specifically, the capsule cavity 4 can be installed on the protective shaft tube located outside the protector shaft. After the capsule cavity 4 is installed, the straightening bearing 3 is installed, and then the settling cavity 5 is assembled. Next, the moving carrier plate 61 of the axial force balancing component 6 is fitted onto the protector shaft 1, and the moving carrier plate 61 is fixed to the protector shaft 1. Then, the slip block carrier plate 62 with the slip block 63 installed is connected. Finally, the mechanical seal 2 is installed to provide a high-pressure mechanical seal for the protector.

[0081] Furthermore, refer to Figure 7 As shown, before installing each component, all parts of the protector need to be cleaned and prepared in advance; and when performing shaft inspection, an automatic shaft inspection machine can be used. Compared with manual shaft inspection, using a shaft inspection machine can effectively reduce labor costs.

[0082] Furthermore, in some applications, submersible pump protectors are typically installed in pairs, connected vertically. In this case, refer to... Figure 7 As shown, after the upper and lower sections of the protector are connected, a disc shaft check can be performed first, and then the assembled protector can be subjected to a whole-machine airtightness test to prevent air leakage. Finally, the protector can be lubricated. After the lubrication is completed, it can be sent to the test platform and other parts of the electric pump for a whole-machine dynamic test.

[0083] The method for preparing a submersible pump protector provided in this embodiment of the invention ensures high airtightness of the protector by increasing the number of inspections during the installation of the submersible pump, and verifies the high-temperature resistance of the protector through a high-temperature dynamic test, so that the submersible pump protector can operate stably.

[0084] In an optional embodiment, the preparation method provided by the present invention further includes: when the pre-selected coating material is polycrystalline diamond, during the coating sintering process, the preset sintering temperature range is 800-1500℃. The inventors of this application have found in their research that when the selected temperature is lower than this temperature range, it is difficult for polycrystalline diamond material to be sintered on the vacuoles substrate and the moving carrier disk substrate. When the temperature is higher than this temperature range, the excessively high temperature will damage the vacuoles substrate and the moving carrier disk substrate.

[0085] Based on the same inventive concept, this invention also provides an application of the above-mentioned submersible pump protector in the field of oilfield production.

[0086] The submersible electric pump protector provided in this embodiment of the invention has a groove milled on the side of the slip block of its axial force balancing component. The other end of the connector is provided with a mating block that mates with the groove. The mating block and the groove allow the slip block to swing relative to the slip block bearing plate under the extrusion force of the protector shaft, and automatically adjust the inclination according to the load and rotation direction requirements. Compared with the static structure of the slip block, this structure can adapt to high load pressure and speed, thereby improving the service life of the protector. Moreover, the coating material sintered on the first end face of the slip block and the second end face of the moving carrier plate is suitable for harsh working conditions such as high temperature, corrosive chemicals, and a large number of wear-resistant solid particles. In other words, through the structural design of the submersible electric pump protector, this embodiment of the invention enables the submersible electric pump to operate under the working conditions of high temperature ultra / ultra-deep wells.

[0087] It should be understood that the specific order or hierarchy of steps in the disclosed process is an example of an exemplary method. Based on design preferences, it should be understood that the specific order or hierarchy of steps in the process may be rearranged without departing from the scope of this disclosure. The appended method claims provide elements of various steps in an exemplary order and are not intended to limit the specific order or hierarchy described.

[0088] In the detailed description above, various features are combined together in a single embodiment to simplify this disclosure. This approach to disclosure should not be construed as reflecting an intention that embodiments of the claimed subject matter require more features than are explicitly stated in each claim. Rather, as reflected in the appended claims, the invention is presented with fewer features than all of the features in a single disclosed embodiment. Therefore, the appended claims are hereby explicitly incorporated into the detailed description, with each claim representing a separate preferred embodiment of the invention.

[0089] The foregoing description includes examples of one or more embodiments. It is certainly impossible to describe all possible combinations of components or methods in order to describe the above embodiments, but those skilled in the art will recognize that further combinations and arrangements of the various embodiments are possible. Therefore, the embodiments described herein are intended to cover all such changes, modifications, and variations that fall within the scope of the appended claims. Furthermore, the term "comprising" as used in the specification or claims is interpreted in a manner similar to the term "including," as interpreted when used as a conjunction in the claims. Additionally, the use of any term "or" in the specification of the claims is intended to mean "non-exclusive or."

Claims

1. An electrical submersible pump protector characterized by, include: The housing, the protector shaft disposed within the housing, the mechanical seal disposed within the housing and arranged sequentially from top to bottom outside the protector shaft, the centering bearing, the capsule cavity, the settling cavity, the axial force balancing component, and the filter cavity; The protector shaft is used to rotate under the influence of an external force; The axial force balancing component includes: a slip block support plate, a moving part support plate, a plurality of slip blocks correspondingly disposed in the grooves on the slip block support plate, and a plurality of connecting parts for connecting the slip blocks and the slip block support plate; The slip block has mating grooves on its opposite side walls, and the connector is spaced apart from the slip block. One end of the connector is connected to the slip block bearing plate, and the other end is provided with a mating block. The mating block is used to mate with the mating groove to axially limit the slip block and allow the slip block to swing relative to the slip block bearing plate under the squeezing force of the protector shaft. The movable carrier plate is used to rotate relative to the slip block under the drive of the protector shaft and to cooperate with the end face of the slip block, so as to transmit the axial force borne by the protector to the slip block carrier plate through the rotational cooperation between the slip block and the movable carrier plate. The first end face of the slip block and the second end face of the movable carrier plate are provided with a coating sintered thereon by a sintering process. The first end face is the end face of the slip block cooperating with the movable carrier plate, and the second end face is the end face of the movable carrier plate cooperating with the slip block. The material of the coating is a material with a friction coefficient of not more than 0.3, a hardness of not less than 6000HV, and a thermal conductivity of not less than 500W / mk.

2. The protector of claim 1, wherein, The mating groove is an arc-shaped groove, and the sidewall of the mating block is set as an arc surface; The sidewall of the mating block extends into the arc-shaped groove to axially limit the slip block, and the arc surface of the mating block is in clearance fit with the arc-shaped groove so that the slip block swings relative to the slip block bearing plate under the extrusion force of the protector shaft.

3. The protector of claim 1, wherein, The coating material is polycrystalline diamond.

4. The protector of claim 1, wherein, The slip blocks are evenly distributed circumferentially on the end face of the slip block bearing plate.

5. A protector according to any one of claims 1-4, characterized in that The connecting component is a round-headed bolt; Accordingly, the bearing plate of the slip block is provided with bolt holes that mate with the round head bolt, and the mating block at the other end of the connector is a round head structure of the round head bolt.

6. The protector of claim 3, wherein, In the sintering process, the coating material is specifically sintered on the first end face of the cascade block and the second end face of the moving carrier disk at a sintering temperature of 800-1500℃.

7. A method of manufacturing a submersible electric pump protector according to any one of claims 1-6, characterized in that include: Obtain the slip block support plate substrate, and mill multiple connecting holes for mating with the connectors on the slip block support plate substrate to obtain the prepared slip block support plate; The pre-selected coating material is sintered at a preset sintering temperature onto the first surface of the acquired slip block substrate and the second surface of the acquired rotor carrier disk substrate. The first surface is the surface of the slip block used to mate with the rotor carrier disk, and the second surface is the surface of the rotor carrier disk used to mate with the slip block. The coating material is a material with a friction coefficient of not more than 0.3, a hardness of not less than 6000HV, and a thermal conductivity of not less than 500W / mk. The surfaces of the sintered coating material on the slip blocks and the surfaces of the sintered coating material on the rotor carrier are ground and polished to achieve the preset surface finish and flatness requirements. The prepared slip blocks are installed on the prepared slip block bearing plate using the connecting parts to complete the preparation of the axial force balancing component of the submersible electric pump protector.

8. The preparation method according to claim 7, characterized in that, Also includes: After obtaining the axial force balance component of the submersible electric pump protector, a temperature and pressure resistance test is conducted on the axial force balance component. The axial force balancing component that achieves temperature and pressure resistance, as well as the mechanical seal, centering bearing, bladder chamber, settling chamber, and filter chamber of the pre-acquired submersible pump protector, are installed on the protector shaft of the submersible pump in a preset installation sequence to obtain the installed protector. Adjust the axial force balance component of the installed protector by adjusting the displacement, and check the shaft of the installed protector by inspecting the disc. After the protector disc shaft passes inspection, a whole-machine airtightness test is conducted on the protector to obtain a protector that meets the preset requirements.

9. The preparation method according to claim 7 or 8, characterized in that, Also includes: When the pre-selected coating material is polydiamond, the preset sintering temperature range during the coating sintering process is 800-1500℃.

10. An application of the submersible pump protector as described in any one of claims 1-6 in the field of oilfield production.

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