Underground mineral insulated oil-submerged pump cable and production device thereof

Abstract

The invention provides an underground mineral insulation oil-submerged pump cable and a production device thereof, and belongs to the technical field of oil-submerged pump cables, the underground mineral insulation oil-submerged pump cable comprises a rack, and the rack is fixedly provided with a mounting cover and two mounting racks; according to the cable, the problem that a traditional cable is short in service life is solved, power can be supplied to an electric pump, heat tracing can be conducted on a shaft, and the oil exploitation efficiency is improved; the preset steel pipe can be used for putting a viscosity reducing medium and improving the thickened oil exploitation and conveying capacity, and also can be used for putting a sensor to collect signals in real time; when the specification of the cable is changed, the clamping blocks move in the opposite direction to adapt to the specification of the cable, the connecting plate and the grooves in the clamping blocks matched with the connecting plate provide a bearing face for the cable, and meanwhile when the distance between the clamping blocks is adjusted, the sliding rods can correspondingly retract or stretch out to adapt to preset steel pipes of different numbers, so that the clamping blocks are convenient to use. The cables of different specifications can be effectively guided without replacing the guide sleeve, and the downtime and the rework rate caused by instability of the cables can be reduced.

Description

Technical Field

[0001] The invention relates to the technical field of submersible pump cables, and in particular to an underground mineral insulated submersible pump cable and a production device thereof. Background Art

[0002] The petroleum industry is one of the main energy sources in my country. With the continuous exploitation of major domestic oil fields, the oil content in the wells has been greatly reduced, resulting in a weakened self-flowing capacity. In order to increase the oil production, various oil production methods are used. The most commonly used one is the oil pump (also known as the kowtow machine), which has a low oil extraction efficiency. The other is the electric submersible pump unit, which has a higher oil extraction efficiency. Therefore, the electric submersible pump oil production process has been increasingly widely used, the oil production depth is getting deeper and deeper, and the temperature, pressure, and corrosion of the working environment of the electric submersible pump are getting higher and higher. The production sites of various oil fields have put forward higher requirements on the various performances of the submersible cables supporting the electric pumps.

[0003] In the oil extraction process, due to the extremely harsh working environment of submersible pump cables, which are under high temperature, high pressure and high corrosion for a long time, the service life of ordinary submersible pump cables is relatively short. Generally, they need to be replaced every one or one and a half years, and cannot adapt to the harsh working environment underground for a long time. In addition, when processing heavy oil, due to its high viscosity characteristics, the existing submersible pump cables are difficult to extract and transport, and more energy is required during the transportation process, which not only increases the extraction cost, but may also lead to a decrease in pumping efficiency, affecting the overall efficiency of oil extraction.

[0004] How to invent a downhole mineral insulated submersible pump cable and a production device thereof to solve these problems has become an urgent problem to be solved by technical personnel in this field. Summary of the invention

[0005] In order to make up for the above shortcomings, the present invention provides a downhole mineral insulated submersible pump cable and a production device thereof, aiming to solve the problems mentioned in the above background.

[0006] The present invention is achieved in that:

[0007] The present invention provides an underground mineral insulated submersible pump cable production device, comprising a frame and a cable body, wherein a mounting cover and two mounting frames are fixedly mounted on the frame, wherein the mounting cover is located between the two mounting frames, and ports for cable entry and exit are arranged on both sides of the mounting cover, and a supporting mechanism is installed on the side wall of the mounting cover located on the lower side of the port, and a vertical limiting mechanism and a horizontal limiting mechanism are installed on the mounting frame, and an adjusting clamp is also arranged at the front end of the mounting frame located on the side of the incoming line end, wherein the horizontal limiting mechanism and the vertical limiting mechanism are both composed of guide rollers and corresponding adjusting mechanisms, and the side wall of the vertical limiting mechanism located on the side of the incoming line end A first motor is installed, the output end of the first motor is fixedly connected to the connecting shaft of the bottom guide roller at the vertical limit mechanism, a box seat and a support frame are fixedly installed on the frame located inside the installation cover, a mounting box is fixedly arranged on the box seat, a channel for the cable to pass through is opened in the mounting box, a line inlet sleeve is fixedly installed inside the channel, a driving rod and a guide rod are arranged inside the mounting box, the guide rod is fixedly connected to the mounting box, the driving rod is rotatably connected to the mounting box and a second motor is fixedly connected to its end, the second motor is fixedly installed on the side wall of the mounting box, and the driving rod and the guide rod both penetrate the side wall of the line inlet sleeve;

[0008] The cable body is composed of a conductor, an insulating layer, a cable sheath, a pre-placed steel pipe and an armor layer.

[0009] Preferably, the inner wall of the box seat is fixedly connected to a third motor, the output shaft of the third motor passes through the side wall of the box seat, the side wall of the support frame is fixedly connected to a limiting sleeve, the interior of the limiting sleeve is rotatably connected to a connecting sleeve through a bearing, the end of the connecting sleeve passes through the side walls of the support frame and the mounting box, the outer side of the connecting sleeve located inside the mounting box is fixedly sleeved with a bevel gear ring, the interior of the mounting box is also provided with a bevel gear meshing with the bevel gear ring, the connecting shaft of the bevel gear is rotatably connected to the mounting box, and a transmission mechanism is provided on one side of the box seat and the mounting box, the transmission mechanism consists of a belt and two pulleys, one of the pulleys is fixedly connected to the connecting shaft of the bevel gear, and the other is fixedly connected to the output shaft of the third motor.

[0010] Preferably, a fixed disk is fixedly installed on the end of the connecting sleeve away from the installation box, an angle adjustment bracket is fixedly installed on the side wall of the fixed disk, a rotating wheel is installed on the angle adjustment bracket, a steel belt roll for armoring the mineral insulated cable is sleeved on the rotating wheel, and two pressure rollers are installed on the inner side wall of the installation cover located on the side of the outlet end, and the connecting shafts of the two pressure rollers are connected by gear meshing.

[0011] Preferably, two clamping blocks are threadedly connected to the driving rod located inside the incoming wire sleeve, and a bidirectional thread is provided on the driving rod located inside the incoming wire sleeve. The two clamping blocks are symmetrically distributed along the dividing point of the bidirectional thread, and a groove matching the mineral insulated cable is provided on the inner side of the clamping block. The lower end of the clamping block is slidably sleeved on the guide rod, and a connecting plate is fixedly connected to the side walls of the clamping block located on the upper and lower sides of the groove, and a sliding trigger assembly is provided inside the connecting plate.

[0012] Preferably, the sliding trigger assembly includes a sliding cavity arranged inside the connecting plate, a first switch and a second switch are fixedly arranged at both ends of the sliding cavity, a trigger plate is slidably arranged inside the sliding cavity, a sliding rod is fixedly connected to the side wall of the trigger plate, an end of the sliding rod passes through the second switch and the side wall of the connecting plate and extends to the outside of the connecting plate, and the end of the sliding rod located on the outside of the connecting plate is fixedly connected to a magnetic attraction plate.

[0013] Preferably, at least two sliding cavities are provided inside each connecting plate, the first switch, the second switch and the second motor are electrically connected, the opposite surfaces of the relatively arranged magnetic suction plates are magnetically arranged with different polarities, and when the number of preset steel pipes is one, the trigger plate is located between the first switch and the second switch.

[0014] Preferably, the trigger plate is in contact with the first switch when there is no need to pre-set the steel pipe.

[0015] Preferably, when the number of preset steel pipes is two, the trigger plate is in contact with the second switch.

[0016] A downhole mineral insulated submersible oil pump cable, the downhole mineral insulated submersible oil pump cable is formed by the downhole mineral insulated submersible oil pump cable production device mentioned above, the insulating layer is sleeved on the outside of the conductor to form an insulating core, the insulating core passes through the cable sheath to form a mineral insulated cable, three mineral insulated cables and a pre-set steel pipe are arranged side by side to form a straight armor, which is arranged in the armor layer.

[0017] Preferably, the conductor is copper, copper-based alloy or nickel-chromium alloy, the power supply cable is only a copper conductor, the insulating layer is composed of tightly compacted white high-purity magnesium oxide powder with a particle size of ≤5um and a purity of ≥99.5%, and the cable sheath is stainless steel 304 / 321 / 316L, 825 alloy.

[0018] Preferably, the number of the pre-placed steel pipes is increased or decreased according to actual production needs.

[0019] A production process for a downhole mineral insulated submersible pump cable comprises the following steps:

[0020] S1: The round conductor raw material metal rod is drawn into the required diameter through a wire drawing machine in multiple passes, and annealed and softened to obtain a conductor;

[0021] S2: removing impurities from magnesium oxide powder, wherein the magnesium oxide is high-purity seawater magnesium oxide powder with a purity of ≥99.5%, and then using a strong magnetic separator to perform 3-5 magnetic separations on the high-purity magnesium oxide to remove magnetic metal inclusions in the powder until there are no magnetic adsorbed particles on the magnet surface of the magnetic separator, and then using a 200-325 mesh screen to screen out magnesium oxide particles with a larger particle size distribution to obtain high-purity magnesium oxide fine powder;

[0022] S3: After the obtained high-purity magnesium oxide fine powder is dried, a special binder is added to make it into a paste. The processed powder is sent to a press to be pressed into a porcelain column. The pressed magnesium oxide porcelain column is put into a storage box or transported by a conveyor belt to an electric furnace for calcination. The calcination temperature is about 1200°C to form an insulating layer. The calcined porcelain column is sent to an assembly table. The calcined porcelain column is first loaded into a tube blank, positioned by a special core rod, and then inserted into the required core blank. During assembly, the magnesium oxide porcelain column is hot assembled at a temperature not lower than 100°C;

[0023] S4: Assemble the conductor, magnesium oxide porcelain column and cable sheath into one body, and repeatedly draw, anneal and reduce the diameter to mineral insulated cable through drawing machine and annealing furnace. Arrange three mineral insulated cables and a pre-set steel pipe in a straight line, and wrap them into a whole with armored steel tape through a wrapping machine to form an armor layer. The armor layer adopts Z-shaped interlocking armoring to prevent the steel tape from being de-armored. After wrapping, the steel tape completely covers the mineral insulated cable.

[0024] The beneficial effects of the present invention are:

[0025] 1. The cable in the present application solves the technical problems of traditional cables in terms of high temperature resistance, high pressure resistance, corrosion resistance, high mechanical strength resistance and strong overload capacity. It can not only supply power to the electric pump, but also heat the wellbore. The cable itself generates heat, which can increase the temperature of the heavy oil, reduce its viscosity and smoothly lift it, thereby improving the efficiency of oil extraction. The structure of the pre-placed steel pipe can not only inject water, hydraulic oil or chemical viscosity reducers and other media into the well to reduce the viscosity of the fluid, effectively improving the extraction and transportation capacity of the heavy oil, but also can be placed in various monitoring sensors to collect temperature, pressure, viscosity, liquid level and other signals from the well in real time and feed them back to the ground receiving system.

[0026] 2. The clamp block can be flexibly driven to move by the second motor, so that the operator can quickly and conveniently adjust the position and spacing of the clamp block when necessary to adapt to cable components of different specifications; when the cable specifications change, the clamp block can move in the opposite direction through the action of the thread, automatically adjust the spacing to adapt to the cable specifications, and ensure that no matter how many pre-set steel pipes are set, the cable can be stably supported; the trigger plate, slide bar and magnetic plate and other components in the sliding trigger assembly work together to automatically trigger the first switch or the second switch according to the movement of the clamp block. These switches are electrically connected to the second motor and can control the operating state of the second motor in real time to ensure that the motor is turned off in time after the cable is stably supported to avoid unnecessary energy consumption and wear; the groove design inside the connecting plate and the clamp block provided a stable supporting surface for the cable. At the same time, when the clamp block is adjusted in spacing, the slide bar can be correspondingly retracted or extended to adapt to different numbers of pre-set steel pipes. Therefore, effective guidance of cables of different specifications can be achieved without replacing the guide sleeve, which can reduce downtime and rework rate caused by cable instability, which helps to improve the overall efficiency and quality of cable production. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 This is a schematic diagram of the overall structure of a downhole mineral insulated submersible pump cable production device provided by the present invention;

[0029] Figure 2 It is a schematic diagram of the cross-sectional structure of an installation cover of a downhole mineral insulated submersible oil pump cable production device provided by the present invention;

[0030] Figure 3 This is a schematic diagram of a top view of a downhole mineral insulated submersible pump cable production device provided by the present invention;

[0031] Figure 4 It is a partial structural schematic diagram of a downhole mineral insulated submersible pump cable production device provided by the present invention;

[0032] Figure 5 It is a schematic front view of a partial structural section of a downhole mineral insulated submersible oil pump cable production device provided by the present invention;

[0033] Figure 6 The invention provides a downhole mineral insulated submersible pump cable production device. Figure 5The enlarged structural diagram at A in the middle;

[0034] Figure 7 It is a schematic diagram of the structure of an inlet sleeve and a second motor of a downhole mineral insulated submersible oil pump cable production device provided by the present invention;

[0035] Figure 8 It is a schematic diagram of the structure of a driving rod and a guide rod of a downhole mineral insulated submersible oil pump cable production device provided by the present invention;

[0036] Fig. 9 The invention provides a downhole mineral insulated submersible pump cable production device. Figure 8 The enlarged structural diagram at B in the middle;

[0037] Fig.10 The invention provides a downhole mineral insulated submersible pump cable production device. Fig. 9 The enlarged structural diagram at C in the middle;

[0038] Fig.11 It is a left-side structural schematic diagram of an inlet sleeve of a downhole mineral insulated submersible oil pump cable production device provided by the present invention;

[0039] Fig.12 It is a schematic diagram of the internal structure of an inlet sleeve of a downhole mineral insulated submersible oil pump cable production device provided by the present invention;

[0040] Fig.13 The present invention provides a schematic diagram of the structure of a downhole mineral insulated submersible pump cable.

[0041] In the figure: 1, frame; 2, mounting cover; 3, mounting frame; 4, first motor; 5, support mechanism; 6, mounting box; 7, support frame; 8, inlet sleeve; 9, second motor; 10, cable body; 31, adjustment clamp; 32, horizontal limit mechanism; 41, vertical limit mechanism; 61, box seat; 62, transmission mechanism; 63, bevel gear; 64, bevel gear ring; 65, connecting sleeve; 66, fixing plate; 67, rotating wheel; 68, Pressure roller; 71, limiting sleeve; 91, driving rod; 92, guide rod; 93, clamping block; 94, connecting plate; 95, sliding rod; 96, magnetic plate; 101, conductor; 102, insulating layer; 103, cable sheath; 104, pre-set steel pipe; 105, armor layer; 611, third motor; 671, angle adjustment bracket; 941, sliding cavity; 942, first switch; 943, second switch; 951, trigger plate. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] Embodiment 1, refer to Figure 1-Figure 7 A downhole mineral insulated submersible pump cable production device comprises a frame 1 and a cable body 10, a mounting cover 2 and two mounting frames 3 are fixedly mounted on the frame 1, the mounting cover 2 is located between the two mounting frames 3, ports for cable entry and exit are arranged on both sides of the mounting cover 2, a supporting mechanism 5 is installed on the side wall of the mounting cover 2 located at the lower side of the port for supporting the cable, a vertical limiting mechanism 41 and a transverse limiting mechanism 32 are installed on the mounting frame 3, an adjusting clamp 31 is also arranged at the front end of the mounting frame 3 located at the side of the incoming line end, the transverse limiting mechanism 32 and the vertical limiting mechanism 41 are both composed of guide rollers and corresponding adjusting mechanisms, and with the cooperation of the adjusting clamp 31, the transverse limiting mechanism 32 and the vertical limiting mechanism 41, three stainless steel sheathed mineral insulated cables and stainless steel empty pipes can be limited.

[0044] A first motor 4 is installed on the side wall of the vertical limiting mechanism 41 located on the side of the incoming line end, and the output end of the first motor 4 is fixedly connected to the connecting shaft of the bottom guide roller at the vertical limiting mechanism 41. When the first motor 4 is started, the cable component can be transferred with the cooperation of the guide roller. A box seat 61 and a support frame 7 are fixedly installed on the frame 1 located inside the installation cover 2. An installation box 6 is fixedly arranged on the box seat 61. A channel for the cable to pass through is opened in the installation box 6. An incoming line sleeve 8 is fixedly installed inside the channel. A driving rod 91 and a guide rod 92 are provided inside the installation box 6. The guide rod 92 is fixedly connected to the installation box 6. The driving rod 91 is rotatably connected to the installation box 6 and a second motor 9 is fixedly connected to its end. The second motor 9 is fixedly installed on the side wall of the installation box 6. The driving rod 91 and the guide rod 92 both penetrate the side wall of the incoming line sleeve 8.

[0045] The cable body 10 is composed of a conductor 101 , an insulating layer 102 , a cable sheath 103 , a pre-installed steel pipe 104 and an armor layer 105 .

[0046] Furthermore, the inner side wall of the box seat 61 is fixedly connected with a third motor 611, the output shaft of the third motor 611 passes through the side wall of the box seat 61, the side wall of the support frame 7 is fixedly connected with a limiting sleeve 71, the interior of the limiting sleeve 71 is rotatably connected with a connecting sleeve 65 through a bearing, the end of the connecting sleeve 65 passes through the side walls of the support frame 7 and the installation box 6, the outer side of the connecting sleeve 65 located inside the installation box 6 is fixedly sleeved with a bevel gear ring 64, and the interior of the installation box 6 is also provided with a bevel gear 63 meshing with the bevel gear ring 64, and the bevel gear 63 meshing with the bevel gear ring 64 is meshed with the bevel gear ring 64. The connecting shaft of the gear 63 is rotatably connected to the installation box 6. A transmission mechanism 62 is provided on one side of the box seat 61 and the installation box 6. The transmission mechanism 62 is composed of a belt and two pulleys, one of which is fixedly connected to the connecting shaft of the bevel gear 63, and the other is fixedly connected to the output shaft of the third motor 611. The third motor 611 is started. At this time, driven by the pulley and the belt, the bevel gear 63 starts to rotate. Since the bevel gear ring 64 is meshed with the bevel gear 63, the bevel gear ring 64 will also drive the connecting sleeve 65 to rotate.

[0047] Furthermore, a fixed disk 66 is fixedly installed at the end of the connecting sleeve 65 away from the installation box 6, and an angle adjustment bracket 671 is fixedly installed on the side wall of the fixed disk 66. A rotating wheel 67 is installed on the angle adjustment bracket 671, and a steel belt roll for armoring the mineral insulated cable is sleeved on the rotating wheel 67. When the connecting sleeve 65 rotates, it will drive the fixed disk 66 to rotate, and then drive the steel belt roll to armor the mineral insulated cable. The winding angle of the steel belt roll can be adjusted by the angle adjustment bracket 671. Two pressure rollers 68 are installed on the inner side wall of the installation cover 2 on the side of the outlet end. The connecting shafts of the two pressure rollers 68 are connected by gear meshing. After the cable is armored, it can pass through the two pressure rollers 68 for compaction.

[0048] Two clamping blocks 93 are threadedly connected on the driving rod 91 located inside the incoming wire sleeve 8. The driving rod 91 located inside the incoming wire sleeve 8 is provided with a bidirectional thread. The two clamping blocks 93 are symmetrically distributed along the dividing point of the bidirectional thread. When the second motor 9 is started, the driving rod 91 starts to rotate, and the two clamping blocks 93 will move in opposite directions (closer or farther away) to adapt to different numbers of pre-set steel pipes 104. The inner side of the clamping block 93 is provided with a groove matching the mineral insulated cable, which is used to support the cable components on both sides. The lower end of the clamping block 93 is slidably sleeved on the guide rod 92, and the clamping block 93 can be limited by the guide rod 92. The side walls of the clamping block 93 located on the upper and lower sides of the groove are also fixedly connected with connecting plates 94. Through the setting of the connecting plates 94, the cable component in the center can be effectively supported to prevent it from deviating from the predetermined trajectory and affecting the armor.

[0049] In this embodiment, the driving rod 91 is driven to rotate by the second motor 9, while the guide rod 92 is fixed and plays a guiding and supporting role. The driving rod 91 is provided with a bidirectional thread, and two clamping blocks 93 are respectively threadedly connected to the driving rod 91 and symmetrically distributed along the dividing point of the bidirectional thread. When the driving rod 91 rotates, due to the effect of the thread, the two clamping blocks 93 will move in opposite directions. This flexibility enables the clamping blocks 93 to adapt to cable components of different diameters or different numbers, ensuring that the cable is stably supported during transmission. The inner side of the clamping block 93 is provided with a concave groove matching the mineral insulated cable. The design of the groove enables the clamp block 93 to fit closely to the outer surface of the cable component, providing a stable supporting effect. This support not only helps to maintain the stability of the cable during transmission, but also reduces the friction between the cable and the clamp block 93, reducing the risk of cable wear. Connecting plates 94 are fixedly connected to the side walls of the clamp block 93 on the upper and lower sides of the groove. These connecting plates 94 further enhance the supporting effect of the clamp block 93 on the central cable component, and can prevent the cable from deviating from the predetermined trajectory due to uneven force during transmission. This is crucial to ensuring the accurate arrangement of the cables and the quality of subsequent armoring processing.

[0050] The cables (including three stainless steel sheathed mineral insulated cables and stainless steel empty pipes) are supported by the supporting mechanism 5 and limited by the adjusting clamp 31, the lateral limiting mechanism 32 and the vertical limiting mechanism 41, and then enter from the port of the mounting cover 2 to ensure that the cables maintain a stable arrangement during transmission. When the cables enter the line entry sleeve 8, the second motor 9 is started, the driving rod 91 rotates, and the two clamping blocks 93 move in opposite directions according to the number and arrangement of the cables (especially the pre-set steel pipes 104) to adapt to and support the cables.

[0051] Armoring treatment: The cable supported by the clamp block 93 continues to move forward and enters the armoring stage. At this time, the connecting sleeve 65 (driven to rotate by the third motor 611 through the transmission mechanism 62) drives the fixed disk 66 and the rotating wheel 67 on the angle adjustment bracket 671 to rotate, and the steel belt roll mounted on the rotating wheel 67 rotates accordingly to armor the cable. The angle adjustment bracket 671 allows the winding angle of the steel belt roll to be adjusted to meet different armoring requirements. The armored cable passes through the outlet end of the installation cover 2 and passes between two pressure rollers 68. The two pressure rollers 68 are connected by gear meshing. When the cable passes through, the pressure roller 68 compacts the cable to ensure that the armor layer 105 fits tightly on the cable.

[0052] In summary, the clamp block 93 can be flexibly driven to move by the second motor 9, so that the operator can quickly and conveniently adjust the position and spacing of the clamp block 93 when necessary to adapt to cable components of different specifications. Since the design of the clamp block 93 and the connecting plate 94 can stably support the cable and prevent it from shifting, the downtime and rework rate caused by cable instability can be reduced, which helps to improve the overall efficiency and quality of cable production.

[0053] Example 2, refer to Figure 2-Figure 12 A sliding trigger assembly is provided inside the connecting plate 94, and the sliding trigger assembly includes a sliding cavity 941 provided inside the connecting plate 94, a first switch 942 and a second switch 943 are fixedly provided at both ends of the sliding cavity 941, a trigger plate 951 is slidingly provided inside the sliding cavity 941, a sliding rod 95 is fixedly connected to the side wall of the trigger plate 951, an end of the sliding rod 95 passes through the second switch 943 and the side wall of the connecting plate 94 and extends to the outside of the connecting plate 94, and a magnetic attraction plate 96 is fixedly connected to the end of the sliding rod 95 located on the outside of the connecting plate 94.

[0054] It should be noted that at least two sliding cavities 941 are provided inside each connecting plate 94 to ensure symmetrical support of the cable components, and to prevent the cable from deviating from the predetermined trajectory due to uneven force during transmission. The first switch 942, the second switch 943 and the second motor 9 are electrically connected. When the first switch 942 or the second switch 943 is triggered, the state of the second motor 9 will change. The opposite surfaces of the relatively arranged magnetic plates 96 are magnetically arranged with different polarities. When the two clamping blocks 93 move in opposite directions, under the action of the magnetic force, the slide bars 95 at different clamping blocks 93 will be connected together through the magnetic plates 96 on both sides.

[0055] When the number of preset steel pipes 104 is one, the trigger plate 951 is located between the first switch 942 and the second switch 943, which is the initial state;

[0056] When there is no need to pre-set the steel pipe 104, the trigger plate 951 contacts the first switch 942. At this time, the distance between the two clamping blocks 93 is reduced, and the central cable component is supported mainly by the connecting plate 94. The sliding rod 95 will retract into the sliding cavity 941 accordingly, and the trigger plate 951 will also squeeze the first switch 942 to turn off the second motor 9 in time. When the number of pre-set steel pipes 104 is two, the trigger plate 951 contacts the second switch 943. At this time, the distance between the two clamping blocks 93 increases. At this time, the sliding rod 95 will also extend into the sliding cavity 941 accordingly. Due to the presence of the magnetic suction plate 96, the connected sliding rod 95 can cooperate with the connecting plate 94 to support the central cable component. At the same time, the trigger plate 951 will also squeeze the corresponding second switch 943 to turn off the second motor 9 in time. Through the above arrangement, there is no need to replace the guide sleeve to achieve effective guidance and support for cables of different specifications.

[0057] In this embodiment, when the number of the pre-set steel pipe 104 is one (refer to Figure 8-Figure 12 ), at this time, the trigger plate 951 is in the middle of the sliding cavity 941, and the trigger plate 951 is located between the first switch 942 and the second switch 943, which is the initial state.

[0058] When the two clamping blocks 93 move in opposite directions, due to the effect of magnetic force, the sliding rods 95 at different clamping blocks 93 will be connected together through the magnetic suction plates 96 on both sides. This magnetic connection ensures the stability and synchronization of the sliding rods 95 during the sliding process.

[0059] When there is no need to pre-install the steel pipe 104, at this time, the distance between the two clamps 93 is reduced, and the central cable component is mainly supported by the connecting plate 94. At the same time, the sliding rod 95 will retract into the sliding cavity 941 accordingly, and the trigger plate 951 will be squeezed onto the first switch 942. After the first switch 942 is triggered, a signal will be sent to the second motor 9 to make it close in time.

[0060] When the number of the preset steel pipes 104 is two, at this time, the distance between the two clamping blocks 93 is increased to accommodate the existence of the preset steel pipes 104. At the same time, the sliding rod 95 will also extend into the sliding cavity 941 accordingly. Due to the existence of the magnetic plate 96, the connected sliding rods 95 can cooperate with the connecting plate 94 to jointly support the central cable component. In addition, the trigger plate 951 will also squeeze the corresponding second switch 943. After the second switch 943 is triggered, it will also send a signal to the second motor 9 to make it close in time.

[0061] When the cable specification changes, the clamp block 93 can move in the opposite direction through the action of the thread, automatically adjust the spacing to adapt to the cable specification, and ensure that no matter how many pre-set steel pipes 104 are set, the cable can be stably supported; the trigger plate 951, the slide bar 95 and the magnetic plate 96 in the sliding trigger assembly work together to automatically trigger the first switch 942 or the second switch 943 according to the movement of the clamp block 93. These switches are electrically connected to the second motor 9 and can control the operating state of the second motor 9 in real time to ensure that the motor is turned off in time after the cable is stably supported to avoid unnecessary energy consumption and wear; the groove design inside the connecting plate 94 and the clamp block 93 that cooperates with it provides a stable supporting surface for the cable. At the same time, when the clamp block 93 adjusts the spacing, the slide bar 95 can be correspondingly retracted or extended to adapt to different numbers of pre-set steel pipes 104. Therefore, effective guidance of cables of different specifications can be achieved without replacing the guide sleeve. This design not only simplifies the operation process, but also improves the versatility and flexibility of the equipment.

[0062] Example 3, refer to Fig.13 A downhole mineral insulated submersible oil pump cable is formed by a downhole mineral insulated submersible oil pump cable production device. An insulating layer 102 is sleeved on the outside of a conductor 101 to form an insulating core. The insulating core passes through a cable sheath 103 to form a mineral insulated cable. Three mineral insulated cables and a pre-set steel pipe 104 are arranged side by side to form a straight armor, which is arranged in an armor layer 105.

[0063] Furthermore, the conductor 101 can be copper, copper-based alloy or nickel-chromium alloy, the power supply cable is only a copper conductor, the insulating layer 102 is composed of tightly compacted white high-purity magnesium oxide powder with a particle size of ≤5um and a purity of ≥99.5%. The cable sheath 103 is stainless steel 304 / 321 / 316L, 825 alloy. High-quality stainless steel pipes imported from Japan are used as the cable sheath 103. They have excellent corrosion resistance, oxidation resistance, good high-temperature strength and creep performance, and better thermal fatigue resistance than domestic stainless steel pipes. The number of preset steel pipes 104 can be increased or decreased according to actual production needs to meet different production needs.

[0064] The production process of the downhole mineral insulated submersible pump cable includes the following steps:

[0065] S1: The round conductor raw material metal rod is drawn into a required diameter through a wire drawing machine in multiple passes, and annealed and softened to obtain a conductor 101;

[0066] S2: removing impurities from magnesium oxide powder, the magnesium oxide is high-purity seawater magnesium oxide powder with a purity of ≥99.5%, and then using a strong magnetic separator to perform 3-5 magnetic separations on the high-purity magnesium oxide to remove magnetic metal inclusions in the powder until there are no magnetic adsorption particles on the magnet surface of the magnetic separator (magnetic separator model: TCXP50, output 20-30t / h, magnetic induction intensity >2500GS), and then using a 200-325 mesh screen to screen out magnesium oxide particles with a larger particle size distribution to obtain high-purity magnesium oxide fine powder;

[0067] S3: After the obtained high-purity magnesium oxide fine powder is dried, a special binder is added to make it into a paste. The processed powder is sent to a press to be pressed into a porcelain column. The pressed magnesium oxide porcelain column is put into a storage box or transported by a conveyor belt to an electric furnace for calcination. The calcination temperature is about 1200°C to form an insulating layer 102. The calcined porcelain column is sent to the assembly table. In order to prevent the porcelain column from being dirty during assembly, the calcined porcelain column can be first loaded into the tube blank, positioned by a special core rod, and then inserted into the required core blank. In order to prevent the porcelain column from absorbing moisture during assembly, the magnesium oxide porcelain column should be hot assembled at a temperature not lower than 100°C;

[0068] S4: Assemble the conductor 101, magnesium oxide porcelain column (insulating layer 102), and cable sheath 103 into one body, and repeatedly draw, anneal, and reduce the diameter of the mineral insulated cable through a drawing machine and an annealing furnace. Arrange three mineral insulated cables and a pre-set steel pipe 104 side by side in a line, and wrap them into a whole with an armored steel tape through a wrapping machine to form an armor layer 105. The armor layer 105 adopts a Z-shaped interlocking armoring method to prevent the steel tape from being de-armored. After wrapping, the steel tape completely covers the mineral insulated cable.

[0069] In this embodiment, the new downhole mineral insulated submersible pump cable is developed by comprehensively considering the practicality, stability, feasibility, domestic and foreign development status and research results of existing ordinary submersible pump cables. It is a new type of special cable that integrates new materials and new technologies. The present invention is mainly composed of three stainless steel sheathed mineral insulated cables, a stainless steel empty pipe and an armored metal belt. The downhole wiring terminal is connected to the submersible electric pump through a special intermediate connector to provide power input to ensure the safe and stable operation of the submersible electric pump. The cable body is bundled from the wellhead along the wellbore to the downhole. When current passes through the cable conductor 101, the entire The cables generate heat evenly and quickly transfer the generated heat energy to the wellbore to achieve the effect of continuous heating. The outlet end of the wellhead is connected to a special explosion-proof junction box, which is precisely controlled by a matching electrical control system. The preset steel pipe 104 can perform injection and signal transmission functions. Different sheath materials are selected according to the temperature, pressure, corrosion and other conditions of each well. In particular, the cable itself has excellent properties of oil resistance, pressure resistance, high temperature resistance and corrosion resistance, which are very suitable for use in harsh underground environments, ensuring the safety and smoothness of oil extraction. The product of the present invention is suitable for supporting power supply or wellbore heating for submersible electric pump units with a rated voltage of less than 3kv.

[0070] Compared with lead sheath and nitrile rubber sheath, the stainless steel sheath used has greatly improved high temperature resistance, corrosion resistance, high pressure resistance, oil and gas penetration resistance, and mechanical strength resistance, and can adapt to the long-term normal operation of the submersible electric pump unit in harsh environments; compared with polypropylene insulation, EPDM insulation, polyimide / F46 composite film + EPDM combined insulation, and fluoroplastic insulation, the high-purity magnesium oxide insulation used has the characteristics of inorganic materials, which makes its physical and chemical properties quite stable, and there is no problem of thermal aging; the conductor of ordinary submersible pump cables cannot generate heat, it can only be a copper conductor, and its function is only to supply power, and The cable of the present invention can not only supply power but also generate heat. The heating function can be realized by changing the conductor material (copper-based alloy, nickel-chromium alloy) through calculation and then changing the input voltage and current to provide heat for the wellbore, increase the temperature of the heavy oil and reduce the viscosity, thereby achieving the effect of smooth lifting. The cable has overload capacity. Theoretically, the cable will not be damaged as long as the temperature of the cable generated by a large current does not exceed the melting point of the sheath and the conductor material. Compared with ordinary submersible pump cables, the cable structure of the present invention is simpler and more practical, and unnecessary filling layers are omitted. The structural dimensions of cables with the same specifications are much smaller, which is conducive to installation in a narrow space in a wellbore.

[0071] The cable in the present application solves the technical problems of traditional cables in terms of high temperature resistance, high pressure resistance, corrosion resistance, high mechanical strength resistance and strong overload capacity. It can not only supply power to the electric pump, but also provide heating for the wellbore. The structure of the pre-installed steel pipe 104 can not only inject water, hydraulic oil or chemical viscosity reducers and other media into the well to reduce the viscosity of the fluid and effectively improve the mining and transportation capacity of heavy oil, but also can be placed in various monitoring sensors to collect temperature, pressure, viscosity, liquid level and other signals from the well in real time and feed them back to the ground receiving system.

[0072] Compared with the prior art, the advantages of the present invention are: high temperature and low temperature resistance, the metal sheath does not melt or burn at the rated operating temperature, and does not break brittlely at low temperature; the constituent materials are all inorganic materials, and their own physical and chemical properties are quite stable at the rated operating temperature; the metal outer sheath and the armor layer 105 have a solid structure, high strength and can withstand mechanical extrusion and bending; the service life is long, and the metal material and high-purity magnesium oxide do not have thermal aging problems, which greatly reduces the number of frequent replacement operations; the armored steel belt and the outer sheath stainless steel material have good high pressure resistance and corrosion resistance to crude oil; it has multiple composite functions such as transmitting electrical energy, heating, injection, signal transmission, etc.

[0073] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0074] It should be noted that the specific model and specifications of the motor need to be selected and determined based on the actual specifications of the device, and the specific selection calculation method adopts the existing technology in this field, so it will not be described in detail.

[0075] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A downhole mineral insulated submersible pump cable production device, comprising a frame (1) and a cable body (10), wherein a mounting cover (2) and two mounting frames (3) are fixedly mounted on the frame (1), wherein the mounting cover (2) is located between the two mounting frames (3), and ports for cable entry and exit are arranged on both sides of the mounting cover (2), and a supporting mechanism (5) is installed on the side wall of the mounting cover (2) located below the ports, and a vertical limiting mechanism (41) and a lateral limiting mechanism (32) are installed on the mounting frame (3), and an adjusting clamp (31) is further arranged at the front end of the mounting frame (3) located on the side of the incoming line end, wherein the lateral limiting mechanism (32) and the vertical limiting mechanism (41) are both composed of guide rollers and corresponding adjusting mechanisms, and a first motor (4) is installed on the side wall of the vertical limiting mechanism (41) located on the side of the incoming line end, and an output end of the first motor (4) is fixedly connected to a connecting shaft of a bottom guide roller at the vertical limiting mechanism (41), characterized in that: A box seat (61) and a support frame (7) are fixedly mounted on the frame (1) located inside the mounting cover (2); a mounting box (6) is fixedly arranged on the box seat (61); a passage for the cable to pass through is provided in the mounting box (6); a line inlet sleeve (8) is fixedly mounted inside the passage; a driving rod (91) and a guide rod (92) are provided inside the mounting box (6); the guide rod (92) is fixedly connected to the mounting box (6); the driving rod (91) is rotatably connected to the mounting box (6) and a second motor (9) is fixedly connected to its end; the second motor (9) is fixedly mounted on a side wall of the mounting box (6); the driving rod (91) and the guide rod (92) both penetrate the side wall of the line inlet sleeve (8); The cable body (10) is composed of a conductor (101), an insulating layer (102), a cable sheath (103), a pre-installed steel pipe (104) and an armor layer (105).

2. A downhole mineral insulated submersible pump cable production device according to claim 1, characterized in that: The inner side wall of the box seat (61) is fixedly connected to a third motor (611), and the output shaft of the third motor (611) passes through the side wall of the box seat (61). The side wall of the support frame (7) is fixedly connected to a limiting sleeve (71), and the interior of the limiting sleeve (71) is rotatably connected to a connecting sleeve (65) through a bearing. The end of the connecting sleeve (65) passes through the side wall of the support frame (7) and the installation box (6), and the outer side of the connecting sleeve (65) located inside the installation box (6) is fixedly connected to A bevel gear ring (64), a bevel gear (63) meshing with the bevel gear ring (64) is also arranged inside the installation box (6), a connecting shaft of the bevel gear (63) is rotatably connected to the installation box (6), a transmission mechanism (62) is arranged on one side of the box seat (61) and the installation box (6), and the transmission mechanism (62) is composed of a belt and two pulleys, one of which is fixedly connected to the connecting shaft of the bevel gear (63), and the other is fixedly connected to the output shaft of the third motor (611).

3. A downhole mineral insulated submersible pump cable production device according to claim 2, characterized in that: A fixed disk (66) is fixedly mounted on the end of the connecting sleeve (65) away from the installation box (6), an angle adjustment bracket (671) is fixedly mounted on the side wall of the fixed disk (66), a rotating wheel (67) is mounted on the angle adjustment bracket (671), a steel belt roll for armoring the mineral insulated cable is sleeved on the rotating wheel (67), two pressure rollers (68) are mounted on the inner side wall of the installation cover (2) located on the side of the outlet end, and the connecting shafts of the two pressure rollers (68) are connected by gear meshing.

4. The downhole mineral insulated submersible pump cable production device according to claim 1, characterized in that: The driving rod (91) located inside the incoming wire sleeve (8) is threadedly connected with two clamping blocks (93), and the driving rod (91) located inside the incoming wire sleeve (8) is provided with a bidirectional thread. The two clamping blocks (93) are symmetrically distributed along the dividing point of the bidirectional thread. The inner side of the clamping block (93) is provided with a groove matching the mineral insulated cable. The lower end of the clamping block (93) is slidably sleeved on the guide rod (92), and the side walls of the clamping block (93) located on the upper and lower sides of the groove are also fixedly connected with connecting plates (94), and a sliding trigger component is provided inside the connecting plate (94).

5. The downhole mineral insulated submersible pump cable production device according to claim 4, characterized in that: The sliding trigger assembly comprises a sliding cavity (941) arranged inside a connecting plate (94), a first switch (942) and a second switch (943) being fixedly arranged at both ends of the sliding cavity (941), a trigger plate (951) being slidably arranged inside the sliding cavity (941), a sliding rod (95) being fixedly connected to the side wall of the trigger plate (951), an end of the sliding rod (95) passing through the second switch (943) and the side wall of the connecting plate (94) and extending to the outside of the connecting plate (94), and a magnetic attraction plate (96) being fixedly connected to the end of the sliding rod (95) located outside the connecting plate (94).

6. The downhole mineral insulated submersible pump cable production device according to claim 5, characterized in that: At least two sliding cavities (941) are provided inside each connecting plate (94); the first switch (942), the second switch (943) and the second motor (9) are electrically connected; the opposite surfaces of the magnetic attraction plates (96) arranged opposite to each other are arranged with magnetic properties of different polarities; when the number of the preset steel pipes (104) is one, the trigger plate (951) is located between the first switch (942) and the second switch (943).

7. The downhole mineral insulated submersible pump cable production device according to claim 6, characterized in that: When the steel pipe (104) does not need to be pre-set, the trigger plate (951) contacts the first switch (942).

8. The downhole mineral insulated submersible pump cable production device according to claim 6, characterized in that: When the number of the preset steel pipes (104) is two, the trigger plate (951) contacts the second switch (943).

9. A downhole mineral insulated submersible oil pump cable, the downhole mineral insulated submersible oil pump cable is formed by the downhole mineral insulated submersible oil pump cable production device according to any one of claims 1 to 8, characterized in that: The insulating layer (102) is sleeved outside the conductor (101) to form an insulating core, and the insulating core passes through the cable sheath (103) to form a mineral insulated cable. Three mineral insulated cables and a pre-installed steel pipe (104) are arranged side by side to form a straight armor and are arranged in an armor layer (105).

10. A downhole mineral insulated submersible pump cable according to claim 9, characterized in that: The conductor (101) is a copper-based alloy, the power supply cable is a copper conductor, and the insulating layer (102) is composed of tightly compacted white high-purity magnesium oxide powder.

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