CN115653544A - Screw pump lifting system based on synchronous reluctance submersible motor - Google Patents
Screw pump lifting system based on synchronous reluctance submersible motor Download PDFInfo
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Abstract
The invention relates to an oil extraction system, in particular to a screw pump lifting system based on a synchronous reluctance submersible motor, which is suitable for crude oil extraction of inclined wells, horizontal wells and thick oil wells, and is characterized in that: including synchronous reluctance submersible motor, high thrust protector, two-way thrust flexible shaft coupling, screw pump, power cable and the control unit at least, synchronous reluctance submersible motor is at the oil pipe of oil well lower extreme, and synchronous reluctance submersible motor's upper end is to the upper end of oil pipe connection in proper order: the system comprises a high-thrust protector, a bidirectional-thrust flexible shaft coupler and a screw pump, wherein the screw pump outputs collected oil to a wellhead unit through a check valve and a reverse flow valve. The deep well oil extraction system using the submersible motor to drive the screw pump can improve the deep well oil extraction process using the submersible motor to drive the screw pump, and has better reliability and manufacturability.
Description
Technical Field
The invention relates to an oil extraction system, in particular to a screw pump lifting system based on a synchronous reluctance submersible motor, which is suitable for crude oil extraction of inclined wells, horizontal wells and thick oil wells, and can effectively solve the technical problems of inclined pumping rods, broken rods, poor operation working conditions of screw pumps, short service life and the like on the ground.
Background
Oil extraction equipment adopted at home and abroad mainly comprises two types of rod oil extraction equipment and rodless oil extraction equipment:
1. the following problems are common to the rod production equipment:
(1) The energy utilization efficiency is low, and the average efficiency of the oil pumping system with the rod is less than 20 percent. The oil extraction system is the largest production power utilization system of the oil field, the annual power consumption of the oil extraction system accounts for about 56% of the total power consumption of the oil field, about one third of the production cost of the oil field is power consumption, the power consumption of oil extraction equipment accounts for about 80% of the total power consumption of the oil extraction, and huge energy waste exists;
(2) The oil recovery rate is low, and for high water-containing wells and heavy oil wells, the conventional ground driving oil pumping unit cannot carry out conventional exploitation due to high operation cost, so that a great amount of oil resources are wasted;
(3) The volume is heavy, the occupied area is large, the working noise is large, and some oil extraction equipment is positioned in urban residential areas, so that the land waste is caused, and the noise influences the work and life of residents;
(4) It is not suitable for inclined wells, horizontal wells, etc.
2. Compared with the most common rod oil extraction equipment, namely a beam pumping unit, the direct-drive submersible screw pump rodless oil extraction equipment can save 70 percent of electricity. The rodless oil production equipment of the direct-drive submersible screw pump has high energy utilization efficiency, is internationally recognized as the most promising oil production equipment, but has great problems in the technology (a speed reducer is required to be adopted between a motor and the screw pump for speed reduction, the output torque of the speed reducer often reaches 600Nm, and the conventional speed reducer cannot reliably work for a long time in a space with the diameter of a pump body of only 100 mm at present), so that the rodless oil production equipment of the direct-drive submersible screw pump has not been popularized and applied at present.
Disclosure of Invention
The invention aims to provide a deep well oil production system which can greatly improve the process of utilizing a submersible motor to drive a screw pump to carry out deep well oil production and has better reliability and manufacturability.
The invention also aims to provide a deep well oil production system which is suitable for crude oil production of inclined wells, horizontal wells, high-temperature wells and heavy oil wells, can improve the reliability of the system, reduce the fault shutdown, reduce the yield loss, improve the development economic benefit and prolong the service life of a synchronous reluctance submersible screw pump device and utilizes a submersible motor to drive a screw pump.
The invention also aims to provide a screw pump lifting system based on the synchronous reluctance submersible motor, so as to effectively solve the technical problems of the friction of a sucker rod of a ground screw pump, rod breakage, poor operating condition of the screw pump, short service life and the like.
The invention aims to realize the screw pump lifting system based on the synchronous reluctance submersible motor, which is characterized in that: including synchronous magnetic resistance submersible motor (11), high thrust protector (10), two-way thrust flexible shaft coupling (9), screw pump (8), power cable (7) and the control unit at least, synchronous magnetic resistance submersible motor (11) is at the oil pipe of oil well (12) lower extreme, and the upper end of synchronous magnetic resistance submersible motor (11) is to the upper end of oil pipe (15) pipe connection in proper order: the high-thrust oil recovery device comprises a high-thrust protector (10), a bidirectional-thrust flexible shaft coupler (9) and a screw pump (8), wherein the screw pump (8) outputs recovery oil to a wellhead unit (3) through a check valve (5) and a reverse flow valve (4); the power supply of the synchronous reluctance submersible motor (11) and the screw pump (8) is controlled by a wellhead transformer (1) on the well through a control unit (2) and output to a power cable (7), and the power cable (7) shuttles through an outer arm of an oil pipe and the inner space of an oil pipe protective pipe (13) and is connected through a wet joint of the cable;
the high-thrust protector (10) is used for balancing the pressure inside well fluid and the motor, blocking the well fluid from entering the motor, bearing the axial force generated by the rotor of the screw pump (8) and avoiding the adverse effect of the axial force on the synchronous reluctance submersible motor (11);
the bidirectional thrust flexible shaft coupler is used for connecting a reluctance motor power output shaft and a screw pump rotor, realizing the conversion of the fixed shaft motion of an input shaft connected with the end of a motor to the planetary deflection motion of an output shaft connected with the end of the screw pump rotor, and transmitting the axial force generated by the screw pump rotor;
the synchronous reluctance submersible motor (11) and the screw pump (8) are used for forming an ultra-low speed synchronous reluctance submersible screw pump unit, and are placed underground along the center of an oil pipe to complete the lifting of the submersible screw pump.
The upper end of the synchronous reluctance submersible motor (11) and the lower end of the synchronous reluctance submersible motor (11) are arranged in a shell (11-16), a middle section stator assembly (11-8) and a rotor assembly (11-9), the rotor assembly (11-9) is abutted against a shaft (11-17), the stator assembly (11-18) is abutted against the inner wall of the shell (11-16) and sleeved outside the outer diameter of the rotor assembly (11-9) in a clearance mode, the stator assembly (11-8) and the rotor assembly (11-9) in the middle section are divided into a front section and a rear section, and the front section and the rear section are centered through a centering guide (11-10); the lower ends of a stator assembly (11-8) and a rotor assembly (11-9) at the middle section are assembled through a base (11-13), an oil filter (11-11) and an oil injection valve (11-12), the input end of the oil injection valve (11-12) is communicated with an oil production pool, the output end of the oil injection valve (11-12) enters the oil filter (11-11), crude oil entering the oil injection valve (11-12) is filtered through the oil filter (11-11), and a threaded protective cover (11-14) is arranged at the bottom of the base assembly (11-13); the upper ends of the middle section stator assembly (11-8) and the rotor assembly (11-9) are provided with: the device comprises a coupler (11-2), a semi-ring assembly (11-3), a thrust disc (11-4), a thrust bearing (11-5), an upper motor joint assembly (11-6) and a cable plug assembly (11-7); the cable of the cable plug assembly (11-7) is three-phase voltage; a semi-ring assembly (11-3), a thrust disc (11-4) and a thrust bearing (11-5) are respectively fixed between the coupler (11-2) and the middle section stator assembly (11-8) and the rotor assembly (11-9).
The high-thrust protector (10) comprises an upper connector assembly (10-2), a lower connector assembly (10-6) and an oil-submersible pipe fitting (10-7), wherein the upper connector assembly (10-2) and the lower connector assembly (10-6) are connected to the upper end and the lower end of the oil-submersible pipe fitting (10-7) in a sleeved mode, a sealing pipe shell (10-8) is arranged between the upper connector assembly (10-2) and the lower connector assembly (10-6), and a fluorine rubber capsule (10-3) and a high-thrust bearing assembly (10-4) are distributed between the sealing pipe shell (10-8) and the oil-submersible pipe fitting (10-7).
The capsule (10-3) is made of fluororubber materials, the middle section of the capsule (10-3) is long, the two ends of the capsule are short, the outer diameter of the end part close to the upper connector assembly (10-2) is smaller than the inner diameter of the sealing pipe shell (10-8), the inner diameter of the sealing pipe shell (10-8) in the middle section is matched, and the end part close to the lower connector assembly (10-6) is a transition section which is reduced from the diameter and then is changed from the diameter to the inner diameter matched with the sealing pipe shell (10-8).
The front end of the capsule (10-3) is coaxially and hermetically connected with the thrust shaft through a front plug (10-10), and a thrust shaft sealing ring (10-12) is arranged between the front plug (10-10) and the thrust shaft for sealing; a rear plug (10-11) is arranged at the rear end of the capsule (10-3) and is coaxially and hermetically connected with the thrust shaft, and a thrust shaft sealing ring (10-12) is arranged between the rear plug (10-11) and the thrust shaft for sealing; the rear plug (10-11) is a convex-shaped structure, the outer diameter of the lower part of the convex shape is attached to the inner diameter of the sealing pipe shell (10-8), the outer diameter of the upper part of the convex shape is attached to the inner diameter of the capsule (10-3), and a bidirectional flexible coupling shell sealing ring (10-13) is added when the outer diameter of the lower part of the convex shape is attached to the inner diameter of the sealing pipe shell (10-8).
The upper joint assembly end (10-2) is hermetically connected with the bidirectional flexible coupling through a mechanical seal (10-1), the lower joint assembly end is connected with the synchronous reluctance submersible motor, and the synchronous reluctance submersible motor high-thrust protector is arranged between the synchronous reluctance submersible motor and the bidirectional flexible coupling.
The high thrust bearing assembly (10-4) is formed by sleeving a plurality of groups of thrust bearing assemblies (10-5) on an outer tube of the submersible pipe fitting (10-7) in a laminated manner.
The bidirectional thrust flexible shaft coupler (9) is connected with a power output shaft of the synchronous reluctance submersible motor (11) and a rotor of the screw pump (8), the bidirectional thrust flexible shaft coupler (9) adopts titanium alloy TC4, and when torque is transmitted, conversion of fixed-shaft motion of an input shaft connected with the end of the motor to planetary deflection motion of an output shaft connected with the rotor end of the screw pump (8) is realized, and axial force generated by the rotor of the screw pump (8) can also be transmitted; a thrust bearing part is arranged at the end part of the flexible shaft, so that the bidirectional thrust flexible shaft coupler (9) bears the upward axial force generated when the rotor of the screw pump (8) rotates reversely.
The invention has the advantages that: aiming at the problems of rodless oil extraction equipment of a direct-drive submersible screw pump, the invention creatively solves the technical problems of ultra-low speed, large torque, high temperature resistance, high efficiency and energy saving in the synchronous reluctance submersible motor, successfully invents the synchronous reluctance submersible screw pump device with ultra-low speed and large torque, thoroughly throws off a speed reducer which influences the reliability and the service life of the submersible screw pump between the synchronous reluctance submersible motor and the screw pump, and makes the practicability of the technology obtain breakthrough progress.
The advantages of the invention are mainly embodied in the following points:
1. the stator is designed in an integral structure, and the stator shell is subjected to metal thermal spraying technology, so that the surface hardness and the corrosion resistance are improved, and the long-term use of the oil field is met. The stator core is an oval open slot, and a double-layer short-distance winding is adopted for reducing higher harmonics, so that the system reliability is improved, the fault shutdown is reduced, the yield loss is reduced, and the development economic benefit is improved;
2. the ferrite is used, so that the cost of the motor is greatly reduced; the salient pole ratio is higher, the weak magnetic speed regulation performance is good, the operation condition of the synchronous reluctance submersible motor is improved, the demagnetization risk does not exist, and the operation life of the synchronous reluctance submersible screw pump device is prolonged;
3. the high-thrust protector balances well fluid and bears the axial force generated by the screw pump rotor, so that adverse effects of the axial force on a system are avoided.
4. The bidirectional thrust flexible shaft coupler can effectively generate a deflection angle required by eccentric motion of a screw pump rotor, effectively transmit downward axial force and bear the upward axial force generated when the screw pump rotor rotates reversely.
5. It is suitable for crude oil extraction of inclined wells, horizontal wells, high-temperature wells and heavy oil wells.
Drawings
FIG. 1 is a schematic diagram of the structure of an embodiment of the present invention;
FIG. 2 is a division diagram of the upper structure of the synchronous reluctance submersible motor;
FIG. 3 is a structural division diagram of the lower segment of the synchronous reluctance submersible motor;
FIG. 4 is a view of a stator core structure, the stator core having an elliptical closed slot configuration;
FIG. 5 is a structural view of a rotor which is a segmented multiple rotor bar-less structure;
fig. 6 is a schematic view of a high thrust protector.
In the figure, 1, a wellhead transformer; 2. a control unit; 3. a wellhead unit; 4. a reflux valve; 5. a check valve; 6. a cable centralizer; 7. power cables (armored cables); 8. a screw pump; 9. a bidirectional thrust flexible shaft coupler; 10. a high thrust protector; 11. a synchronous reluctance submersible motor; 12. an oil well; 13. protecting the oil pipe; 14. and (4) supplying power to the underground.
11-1, a transportation cap; 11-2, a coupler; 11-3, assembling the semi-rings; 11-4, a thrust disc; 11-5, a thrust bearing; 11-6, assembling an upper motor joint; 11-7, assembling a cable plug; 11-8, a stator assembly; 11-9, a rotor assembly; 11-10, a centralizer; 11-11, an oil filter; 11-12, an oil filling valve; 11-13, assembling a base; 11-14, threaded protective covers; 11-15, laying down the block; 11-16, synchronous reluctance submersible motor housing.
Detailed Description
As shown in figure 1, the ultra-low speed synchronous reluctance submersible screw pump lifting system is characterized in that: including synchronous reluctance submersible motor 11, high thrust protector 10, two-way thrust flexible shaft coupling 9, screw pump 8, power cable 7 and the control unit at least, synchronous reluctance submersible motor 11 is at oil pipe 15 of 12 lower extremes of oil well, and synchronous reluctance submersible motor 11's upper end is connected to the upper end of oil pipe 15 pipe fitting in proper order: the high-thrust oil recovery device comprises a high-thrust protector 10, a bidirectional-thrust flexible shaft coupler 9 and a screw pump 8, wherein the screw pump 8 outputs the recovery oil to the wellhead unit 3 through a check valve 5 and a reverse flow valve 4.
The power supply of the synchronous reluctance submersible motor 11 and the screw pump 8 is controlled by a wellhead transformer 1 on the well through a control unit 2 and output to an armored cable 7, and the armored cable 7 shuttles back and forth through an outer arm of an oil pipe 15 and the inner space of an oil pipe protective pipe 13 and is connected through a wet joint of the cable.
The synchronous reluctance submersible motor 11 and the screw pump 8 form an ultra-low speed synchronous reluctance submersible screw pump unit, which is a technology that the underground synchronous reluctance submersible motor directly drives a screw pump rotor to rotate and has the characteristics of ultra-low speed, large torque, smooth speed regulation, high temperature resistance, high corrosion resistance, high efficiency, energy conservation and the like. The speed regulating range of the synchronous reluctance submersible motor 11 is 50-700 rpm and is in the optimal working rotating speed range of the screw pump 8. The efficiency of the synchronous reluctance submersible motor reaches more than 90%, and the starting torque reaches more than 700 N.m.
The synchronous reluctance submersible motor 11 is different from the traditional electromagnetic induction motor, the ferrite is fused in the design of the synchronous reluctance submersible motor, and compared with the traditional induction motor, the synchronous reluctance submersible motor 11 has higher starting torque when the rated power requirement is the same, the system power factor is improved, the power loss is reduced, and the system current and the unit heat productivity are reduced. Because of the low heat production, the cooling requirements of the synchronous reluctance submersible motor 11 are also reduced relative to conventional motors and can be operated at lower frequencies. The synchronous reluctance submersible motor 11 adopts variable frequency vector control, so that the system can adjust in time aiming at the change of well conditions, and the adverse effect of low flow speed conditions is optimized or eliminated, thereby ensuring the maximum yield.
As shown in fig. 2 and 3, the upper end of the synchronous reluctance submersible motor and the lower end of the synchronous reluctance submersible motor in fig. 2 and 3 are arranged in a shell 11-16, a middle section stator assembly 11-8 and a rotor assembly 11-9, the rotor assembly 11-9 abuts against a shaft 11-17, the stator assembly 11-18 abuts against the inner wall of the shell 11-16 and is sleeved outside the outer diameter of the rotor assembly 11-9 in an empty mode, the stator assembly 11-8 and the rotor assembly 11-9 in the middle section are divided into a front section and a rear section, and the front section and the rear section are centered through centering devices 11-10.
The lower ends of a stator assembly 11-8 and a rotor assembly 11-9 in the middle section are assembled through a base 11-13, an oil filter 11-11 and an oil injection valve 11-12, the input end of the oil injection valve 11-12 is communicated with an oil production pool, the output end of the oil injection valve 11-12 enters the oil filter 11-11, crude oil entering the oil injection valve 11-12 is filtered through the oil filter 11-11, and the bottom of the base assembly 11-13 is provided with a threaded protective cover 11-14.
The upper ends of the middle section stator assembly 11-8 and the rotor assembly 11-9 are provided with: the device comprises a coupler 11-2, a semi-ring assembly 11-3, a thrust disc 11-4, a thrust bearing 11-5, an upper motor joint assembly 11-6 and a cable plug assembly 11-7; the cables of the cable plug assembly 11-7 are three phase voltages.
The cable plug assembly 11-7 controls the power supply of the wellhead transformer 1 to be supplied to the synchronous reluctance submersible motor through the control unit 2, and the rotor is driven to rotate through the rotor assembly 11-9.
A coupling 11-2, a middle section stator assembly 11-8 and a rotor assembly 11-9 are respectively fixed with a half ring assembly 11-3, a thrust disc 11-4 and a thrust bearing 11-5.
The upper end of the synchronous reluctance submersible motor and the lower end of the synchronous reluctance submersible motor are in a flexible body structure in the shell 11-16.
From the above description, it can be seen that the rotor assembly 11-9 in the ultra-low speed synchronous reluctance submersible motor is suspended in the stator assembly 11-8 through the half-ring assembly 11-3 and the thrust disk 11-4, so as to reduce the over-positioning problem caused by the deformation of the stator assembly 11-8 and the rotor assembly 11-9, and reduce the load of the centralizer 11-10 and the thrust bearing 11-5.
The ultra-low speed synchronous reluctance submersible motor cooling system formed by the stator assembly 11-8 and the rotor assembly 11-9 is reasonable, the whole body is a hollow shaft and is communicated up and down, radial holes are formed in the positions of the centralizer 11-10 and the thrust bearing 11-5, and oil flows out of the radial holes under the action of centrifugal force when the motor rotates to lubricate the centralizing bearing. The motor has reasonable oil circulation design in the inner cavity, not only takes cooling into consideration, but also takes oil supply of each lubricating part into consideration, and ensures effective lubrication.
The stator assembly 11-8 and the shell are designed in an integral structure, and the stator shell is subjected to metal thermal spraying technology to increase the surface hardness and corrosion resistance, so that the long-term use of the oil field is met.
The stator core is in an elliptical closed slot structure, and as shown in fig. 4, the stator winding is in a Y connection method. A double-layer short-distance winding is adopted for reducing higher harmonics, and a PEEK (polyether ether ketone) resin electromagnetic wire with high strength, high toughness and high temperature resistance is adopted as the electromagnetic wire, so that the influence of the higher harmonics of the frequency converter on the service life of the motor is effectively prevented.
The ultra-low speed synchronous reluctance submersible motor adopts a tubular integral groove insulation technology, the end part of the winding adopts an integral pouring and solidifying sealing groove opening, and the service life of the motor is greatly prolonged without being burnt even if the synchronous reluctance motor enters water.
The rotor is of a segmented multi-rotor non-conducting bar structure, as shown in figure 5, each segment is positioned by a centering bearing, and each segment is isolated by non-magnetic conducting materials so as to reduce the influence of ferrite on the centering bearing. The rotor ferrite is of an embedded structure, can resist the temperature of 260 ℃ so as to be firm and reliable, and is integrally bonded by JK-6363 special epoxy glue. Oil-resistant and wear-resistant washers are arranged at two ends of the centering bearing between the rotors, so that the rotation flexibility of the centering bearing is ensured. The motor lead wire uses a polytetrafluoroethylene cord. The motor lead-out cable adopts a plug-in type structure, and is simple to operate and reliable in sealing. The synchronous reluctance submersible motor realizes the intellectualization of the motor through vector control.
Between the base assembly 11-13 and the housing 11-16 there are the lowering blocks 11-15 to protect the synchronous reluctance submersible motor.
And a transport cap 11-1 is arranged on the top of the coupling 11-2, and is also used for protecting the synchronous reluctance submersible motor.
The synchronous reluctance submersible motor is different from the traditional electromagnetic induction motor, the ferrite is fused in the design of the synchronous reluctance submersible motor, and compared with the traditional induction motor and the synchronous reluctance submersible motor which have the same rated power requirement, the synchronous reluctance submersible motor has higher starting torque, improves the power factor of a system, reduces the power loss, and reduces the system current and the heat productivity of a unit. Because of less heat generation, the cooling requirement of the synchronous reluctance submersible motor is reduced compared with the traditional motor, and the synchronous reluctance submersible motor can operate at lower frequency. The synchronous reluctance submersible motor adopts variable frequency vector control, so that the system can adjust in time aiming at the change of well conditions, and the adverse effect of low flow speed conditions is optimized or eliminated, thereby ensuring the maximum yield. Therefore, the operating range of the synchronous reluctance submersible motor is enlarged due to the advantages of low heat production, high speed, ultra-precise control and the like. The synchronous reluctance motor uses strong ferrite embedded inside so that the motor can be operated in synchronization with the changing speed of the motor magnetic field. The synchronous reluctance submersible motor structurally has higher power density than an electromagnetic induction motor, and meanwhile, when a unit is started, the stator current and the torque current of the motor are controlled through vectors, a synchronous reluctance submersible motor system can output starting torque which is 2 to 3 times higher than that of the electromagnetic induction motor, and the reliability and the economy of the system for complex oil well operation are greatly improved.
As shown in fig. 6, the high thrust protector 10 is used for balancing the pressure inside the well fluid and the motor, blocking the well fluid from entering the motor, and bearing the axial force generated by the rotor of the screw pump 8, so as to avoid the adverse effect of the axial force on the synchronous reluctance submersible motor 11.
The high thrust bearing group in the high thrust protector 10 is composed of multiple rows of thrust bearings, axial dynamic load is improved, the friction coefficient of the bearings is large, and the high thrust bearing group is suitable for occasions with low rotating speed.
The high thrust protector 10 comprises an upper joint assembly 10-2, a lower joint assembly 10-6 and an oil-submerged pipe fitting 10-7, wherein the upper joint assembly 10-2 and the lower joint assembly 10-6 are connected to the upper end and the lower end of the oil-submerged pipe fitting 10-7 in a sleeved mode, a sealing pipe shell 10-8 is arranged between the upper joint assembly 10-2 and the lower joint assembly 10-6, a fluorine rubber capsule 10-3 and a high thrust bearing assembly 10-4 are distributed between the sealing pipe shell 10-8 and the oil-submerged pipe fitting 10-7.
The capsule 10-3 is made of fluororubber material, the middle section of the capsule 10-3 is long, the two ends are short, the outer diameter of the end part close to the upper joint assembly 10-2 is smaller than the inner diameter of the sealing pipe shell 10-8, the inner diameter of the sealing pipe shell 10-8 in the middle section is matched, the end part close to the lower joint assembly 10-6 is a transition section with the diameter reduced and the diameter is changed to be matched with the inner diameter of the sealing pipe shell 10-8.
The front end of the capsule 10-3 is coaxially and hermetically connected with the thrust shaft through a front plug 10-10, and a thrust shaft sealing ring 10-12 is arranged between the front plug 10-10 and the thrust shaft for sealing; a rear plug 10-11 is arranged at the rear end of the capsule 10-3 and is coaxially and hermetically connected with the thrust shaft, and a thrust shaft sealing ring 10-12 is arranged between the rear plug 10-11 and the thrust shaft for sealing; the rear plug 10-11 is a convex-shaped structure, the outer diameter of the lower part of the convex shape is attached to the inner diameter of the sealed tube shell 10-8, the outer diameter of the upper part of the convex shape is attached to the inner diameter of the capsule 10-3, and a bidirectional flexible coupling shell sealing ring 10-13 is added when the outer diameter of the lower part of the convex shape is attached to the inner diameter of the sealed tube shell 10-8.
The upper joint assembly end 10-2 is hermetically connected with the bidirectional flexible coupling through a mechanical seal 10-1, the lower joint assembly end is connected with the synchronous reluctance submersible motor, and the high-thrust protector of the synchronous reluctance submersible motor is arranged between the synchronous reluctance submersible motor and the bidirectional flexible coupling.
The high thrust bearing assembly 10-4 is formed by sleeving a plurality of groups of thrust bearing assemblies 10-5 on an outer tube of a submersible pipe fitting 10-7 in a laminated manner.
The bidirectional thrust flexible shaft coupler 9 is connected with a power output shaft of the synchronous reluctance submersible motor 11 and a rotor of the screw pump 8. The bidirectional thrust flexible shaft coupler 9 adopts titanium alloy TC4, can realize the conversion of the fixed shaft motion of an input shaft connected with the end of a motor to the planetary deflection motion of an output shaft connected with the rotor end of the screw pump 8 and can transmit the axial force generated by the rotor of the screw pump 8 while transmitting the torque. The thrust bearing part is arranged at the end part of the flexible shaft, so that the bidirectional thrust flexible shaft coupler 9 bears the upward axial force generated when the rotor of the screw pump 8 rotates reversely, the bearing capacity and the reliability are improved, and the paraffin removal back washing of the screw pump 8 is facilitated.
The screw pump 8 is composed of a stator and a rotor, the stator is made of rubber, the rotor is processed by 40Cr, and the surface of the rotor is plated with chrome and is a spiral slender rod. The rotor rotates in a planetary way, so that the screw pump has larger axial force and has stronger adaptation to liquid with larger viscosity, sand and gas.
The lower connecting structure and the metal base are connected with a motor of an underground submersible pump through a lower cable and are directly placed into the underground, the upper cable is connected with the upper connecting structure, the upper connecting structure and parts connected with the upper connecting structure are placed into the underground along the center of an oil pipe, the metal cover and the upper metal column generate electromagnetic attraction force by electrifying a coil, the metal cover and the upper metal column are attracted to be close to the lower connecting structure and the metal base, and the metal base and the bottom of the metal cover are close to each other and butted due to the dead weight of the upper cable, the upper connecting structure and the parts connected with the upper connecting structure, so that the aim of butting and conducting the lower connecting structure and the upper connecting structure is fulfilled; the upper part and the lower part of the invention can complete butt joint and conduction under the well through electromagnetic suction and self gravity, therefore, the upper cable, the upper connecting structure and the parts connected with the upper connecting structure can be placed under the well along the center of the oil pipe, thereby avoiding the cable from being extruded and damaged by the well wall, avoiding the problems of falling objects under the well caused by friction with the well wall and the like, preventing the occurrence of accidents under the well, saving the operation cost and increasing the economic benefit; the structure is simple, the use is safe, and the operation is convenient.
Claims (8)
1. The utility model provides a screw pump system of lifting based on latent oil motor of synchronous reluctance which characterized by: including synchronous magnetic resistance submersible motor (11), high thrust protector (10), two-way thrust flexible shaft coupling (9), screw pump (8), power cable (7) and the control unit at least, synchronous magnetic resistance submersible motor (11) is at the oil pipe of oil well (12) lower extreme, and the upper end of synchronous magnetic resistance submersible motor (11) is to the upper end of oil pipe (15) pipe connection in proper order: the high-thrust oil recovery device comprises a high-thrust protector (10), a bidirectional-thrust flexible shaft coupler (9) and a screw pump (8), wherein the screw pump (8) outputs recovery oil to a wellhead unit (3) through a check valve (5) and a reverse flow valve (4); the power supply of the synchronous reluctance submersible motor (11) and the screw pump (8) is controlled by a wellhead transformer (1) on the well through a control unit (2) and output to a power cable (7), and the power cable (7) shuttles through an outer arm of an oil pipe and the inner space of an oil pipe protective pipe (13) and is connected through a wet joint of the cable;
the high-thrust protector (10) is used for balancing the pressure inside well fluid and the motor, blocking the well fluid from entering the motor, bearing the axial force generated by the rotor of the screw pump (8) and avoiding the adverse effect of the axial force on the synchronous reluctance submersible motor (11);
the bidirectional thrust flexible shaft coupler is used for connecting a reluctance motor power output shaft and a screw pump rotor, realizing the conversion of the fixed shaft motion of an input shaft connected with the end of a motor to the planetary deflection motion of an output shaft connected with the end of the screw pump rotor, and transmitting the axial force generated by the screw pump rotor;
the synchronous reluctance submersible motor (11) and the screw pump (8) are used for forming an ultra-low speed synchronous reluctance submersible screw pump unit, and are placed underground along the center of an oil pipe to complete the lifting of the submersible screw pump.
2. The screw pump lifting system based on the synchronous reluctance submersible motor as claimed in claim 1, characterized in that: the upper end of the synchronous reluctance submersible motor (11) and the lower end of the synchronous reluctance submersible motor (11) are arranged in a shell (11-16), a middle section stator assembly (11-8) and a rotor assembly (11-9), the rotor assembly (11-9) is abutted against a shaft (11-17), the stator assembly (11-18) is abutted against the inner wall of the shell (11-16) and sleeved outside the outer diameter of the rotor assembly (11-9) in a clearance mode, the stator assembly (11-8) and the rotor assembly (11-9) in the middle section are divided into a front section and a rear section, and the front section and the rear section are centered through a centering guide (11-10); the lower ends of a stator assembly (11-8) and a rotor assembly (11-9) in the middle section are assembled through a base (11-13), an oil filter (11-11) and an oil injection valve (11-12), the input end of the oil injection valve (11-12) is communicated with an oil production pool, the output end of the oil injection valve (11-12) enters the oil filter (11-11), crude oil entering the oil injection valve (11-12) is filtered through the oil filter (11-11), and a threaded protective cover (11-14) is arranged at the bottom of the base assembly (11-13); the upper ends of the middle section stator assembly (11-8) and the rotor assembly (11-9) are provided with: the device comprises a coupler (11-2), a semi-ring assembly (11-3), a thrust disc (11-4), a thrust bearing (11-5), an upper motor joint assembly (11-6) and a cable plug assembly (11-7); the cable of the cable plug assembly (11-7) is three-phase voltage; a semi-ring assembly (11-3), a thrust disc (11-4) and a thrust bearing (11-5) are respectively fixed between the coupler (11-2) and the middle section stator assembly (11-8) and the rotor assembly (11-9).
3. The screw pump lifting system based on the synchronous reluctance submersible motor as claimed in claim 1, characterized in that: the high-thrust protector (10) comprises an upper connector assembly (10-2), a lower connector assembly (10-6) and an oil-submersible pipe fitting (10-7), wherein the upper connector assembly (10-2) and the lower connector assembly (10-6) are connected to the upper end and the lower end of the oil-submersible pipe fitting (10-7) in a sleeved mode, a sealing pipe shell (10-8) is arranged between the upper connector assembly (10-2) and the lower connector assembly (10-6), and a fluorine rubber capsule (10-3) and a high-thrust bearing assembly (10-4) are distributed between the sealing pipe shell (10-8) and the oil-submersible pipe fitting (10-7).
4. The screw pump lifting system based on the synchronous reluctance submersible motor as claimed in claim 3, which is characterized in that: the capsule (10-3) is made of fluororubber materials, the middle section of the capsule (10-3) is long, the two ends of the capsule are short, the outer diameter of the end part close to the upper connector assembly (10-2) is smaller than the inner diameter of the sealing pipe shell (10-8), the inner diameter of the sealing pipe shell (10-8) in the middle section is matched, and the end part close to the lower connector assembly (10-6) is a transition section which is reduced from the diameter and then is changed from the diameter to the inner diameter matched with the sealing pipe shell (10-8).
5. The screw pump lifting system based on the synchronous reluctance submersible motor as claimed in claim 3, which is characterized in that: the front end of the capsule (10-3) is coaxially and hermetically connected with the thrust shaft through a front plug (10-10), and a thrust shaft sealing ring (10-12) is arranged between the front plug (10-10) and the thrust shaft for sealing; a rear plug (10-11) is arranged at the rear end of the capsule (10-3) and is coaxially and hermetically connected with the thrust shaft, and a thrust shaft sealing ring (10-12) is arranged between the rear plug (10-11) and the thrust shaft for sealing; the rear plug (10-11) is a convex-shaped structure, the outer diameter of the lower part of the convex shape is attached to the inner diameter of the sealing pipe shell (10-8), the outer diameter of the upper part of the convex shape is attached to the inner diameter of the capsule (10-3), and a bidirectional flexible coupling shell sealing ring (10-13) is added when the outer diameter of the lower part of the convex shape is attached to the inner diameter of the sealing pipe shell (10-8).
6. The screw pump lifting system based on the synchronous reluctance submersible motor as claimed in claim 3, which is characterized in that: the upper joint assembly end (10-2) is hermetically connected with the bidirectional flexible coupling through a mechanical seal (10-1), the lower joint assembly end is connected with the synchronous reluctance submersible motor, and the high-thrust protector of the synchronous reluctance submersible motor is arranged between the synchronous reluctance submersible motor and the bidirectional flexible coupling.
7. The screw pump lifting system based on the synchronous reluctance submersible motor as claimed in claim 3, which is characterized in that: the high thrust bearing assembly (10-4) is formed by sleeving a plurality of groups of thrust bearing assemblies (10-5) on an outer tube of the submersible pipe fitting (10-7) in a laminated manner.
8. The screw pump lifting system based on the synchronous reluctance submersible motor as claimed in claim 1, characterized in that: the bidirectional thrust flexible shaft coupler (9) is connected with a power output shaft of the synchronous reluctance submersible motor (11) and a rotor of the screw pump (8), the bidirectional thrust flexible shaft coupler (9) adopts titanium alloy TC4, and when torque is transmitted, conversion of fixed-shaft motion of an input shaft connected with the end of the motor to planetary deflection motion of an output shaft connected with the rotor end of the screw pump (8) is realized, and axial force generated by the rotor of the screw pump (8) can also be transmitted; a thrust bearing part is arranged at the end part of the flexible shaft, so that the bidirectional thrust flexible shaft coupler (9) can bear the upward axial force generated when the rotor of the screw pump (8) rotates reversely.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211720468.9A CN115822958A (en) | 2022-10-26 | 2022-10-26 | Ultra-low speed synchronous reluctance submersible screw pump |
| CN202211315776.3A CN115653544A (en) | 2022-10-26 | 2022-10-26 | Screw pump lifting system based on synchronous reluctance submersible motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211315776.3A CN115653544A (en) | 2022-10-26 | 2022-10-26 | Screw pump lifting system based on synchronous reluctance submersible motor |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211720468.9A Division CN115822958A (en) | 2022-10-26 | 2022-10-26 | Ultra-low speed synchronous reluctance submersible screw pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115653544A true CN115653544A (en) | 2023-01-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211315776.3A Pending CN115653544A (en) | 2022-10-26 | 2022-10-26 | Screw pump lifting system based on synchronous reluctance submersible motor |
| CN202211720468.9A Pending CN115822958A (en) | 2022-10-26 | 2022-10-26 | Ultra-low speed synchronous reluctance submersible screw pump |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211720468.9A Pending CN115822958A (en) | 2022-10-26 | 2022-10-26 | Ultra-low speed synchronous reluctance submersible screw pump |
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| CN (2) | CN115653544A (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117411244B (en) * | 2023-12-14 | 2024-02-20 | 沈阳众创高科节能电机技术有限公司 | Sectional multi-stage cooling water-filled permanent magnet submersible motor |
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2022
- 2022-10-26 CN CN202211315776.3A patent/CN115653544A/en active Pending
- 2022-10-26 CN CN202211720468.9A patent/CN115822958A/en active Pending
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| CN115822958A (en) | 2023-03-21 |
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