CN209924972U - Intelligent oil production system using all-metal screw pump - Google Patents

Abstract

The utility model provides an use intelligent oil recovery system of all-metal screw pump, it can solve the technical problem that current metal screw pump life is short, the energy consumption is high, the pump efficiency is low, easy sand card and intelligent degree is low. An intelligent oil production system applying an all-metal screw pump comprises the all-metal screw pump, an oil collecting unit and a steam generating unit; the method is characterized in that: the internal thread curved surface and the external thread curved surface of the all-metal screw pump are both of conical spiral structures and have the same taper; the oil extraction system comprises an elevating mechanism and a monitoring control mechanism, wherein the monitoring control mechanism comprises a controller, a torque sensor, a flow sensor, a pressure sensor, a liquid level detector and a standby power supply, and the controller is electrically connected with the torque sensor, the flow sensor, the pressure sensor, the liquid level detector, the standby power supply, a driving motor, a servo motor, a first valve and a second valve respectively.

Description

Intelligent oil production system using all-metal screw pump

Technical Field

The utility model relates to an oil development equipment technical field, concretely relates to use intelligent oil recovery system of all-metal screw pump.

Background

Common oil development equipment mainly includes kowtow machine and screw pump, and the screw pump divide into all-metal screw pump and rubber screw pump again, and wherein, the screw pump has following advantage compared in the kowtow machine:

1. the required space is small, and 2/3 mounting space can be saved by one ground driving device;

2. the kinetic energy loss is low, part of kinetic energy of the head knocking machine is useless, oil is not discharged, and the all-metal screw pump continuously discharges oil in the working process;

3. the regulation and control are convenient, and the oil output can be controlled by controlling the rotating speed of the motor;

4. the applicability is good, the effect on the exploitation of the thickened oil is good, and the method is suitable for various viscosities;

5. the flow is uniform, the vibration frequency is low, and the noise is low;

6. the structure is simple, the failure rate is low, and air lock cannot be generated;

7. the installation and the replacement are simple.

Compared with a rubber screw pump, the all-metal screw pump has the following advantages: the steam can be injected with a pump, namely, the steam is directly injected into the well through the all-metal screw pump, the stator of the screw pump does not need to be lifted, and the working efficiency is high.

However, the existing metal screw pump also has the following defects:

1. the radial dimensions of the stator and the rotor are kept uniform along the longitudinal direction, and in the working process, sand mixed in crude oil abrades the stator and the rotor to increase the gap between the stator and the rotor, so that the pumping pressure of the metal screw pump is reduced, namely the pumping efficiency is gradually reduced in the using process, and after the pumping pressure is reduced to a certain degree, the crude oil cannot be pumped out, namely the screw pump needs to be replaced, so that the service life of the screw pump is short, the time consumption for replacing the screw pump is long, and the crude oil exploitation efficiency is reduced;

2. the intelligent degree is low, the radial size of the stator and the rotor is kept uniform along the longitudinal direction, a, after abrasion, the gap between the stator and the rotor cannot be adjusted, namely the pump efficiency cannot be adjusted, b, after the sand content of crude oil is changed, the gap between the stator and the rotor cannot be adjusted, the abrasion of the stator and the rotor is intensified, the service life of the screw pump is reduced, c, after power failure, sand between the sleeve and the sucker rod falls down together with the crude oil, the sand is deposited in the gap between the stator and the rotor, so that the rotor is blocked, namely the sand blocking phenomenon occurs, after power is supplied, the rotor is inevitably required to be lifted to be completely separated from a sand blocking section, a large amount of manpower and material resources are consumed, and in the blockage removing process, the whole screw pump can be damaged.

SUMMERY OF THE UTILITY MODEL

The utility model provides an use intelligent oil recovery system of all-metal screw pump, it can solve the technical problem that current metal screw pump life is short, the energy consumption is high, the pump efficiency is low, easy sand card and intelligent degree is low.

An intelligent oil production system applying an all-metal screw pump comprises the all-metal screw pump, an oil collecting unit and a steam generating unit;

the all-metal screw pump comprises a stator, a rotor, a pumping rod, a sleeve, a speed reducer and a driving motor, wherein the stator is provided with an internal thread curved surface, the rotor is installed in the stator and is provided with an external thread curved surface matched with the internal thread curved surface, the sleeve is connected with the stator, the pumping rod is installed in the sleeve and is connected with the rotor, and the driving motor, the speed reducer and the pumping rod are sequentially connected;

the oil collecting unit is used for storing crude oil, the steam generating unit is used for providing steam, an oil outlet of the all-metal screw pump is connected with an input end of an oil conveying pipeline, an output end of the oil conveying pipeline is respectively connected with an oil inlet of the oil collecting unit and a steam outlet of the steam generating unit, a first valve is installed at an oil inlet of the oil collecting unit, and a second valve is installed at a steam outlet of the steam generating unit;

the method is characterized in that:

the internal thread curved surface and the external thread curved surface are both conical helical structures and have the same taper;

the oil production system comprises a lifting mechanism, the lifting mechanism comprises a cross beam, a first clamping piece, a second clamping piece, a plane bearing, a lifting assembly and a servo motor, the sucker rod penetrates through the plane bearing and the cross beam from top to bottom, the first clamping piece is detachably and fixedly connected with the sucker rod below the cross beam, the first clamping piece and the speed reducer are in sliding fit in the up-and-down direction and can transmit torque to the speed reducer and the sucker rod, the second clamping piece is detachably and fixedly connected with the sucker rod above the cross beam and abuts against the plane bearing, the plane bearing is installed on the cross beam, the two lifting assemblies are respectively arranged at two ends of the cross beam, the output ends of the lifting assemblies are respectively fixedly connected with the cross beam, and the servo motor drives the lifting assemblies to do lifting movement;

the oil extraction system comprises a monitoring control mechanism, wherein the monitoring control mechanism comprises a controller, a torque sensor, a flow sensor, a pressure sensor, a liquid level detector and a standby power supply, the controller is electrically connected with the torque sensor, the flow sensor, the pressure sensor, the liquid level detector, the standby power supply, the driving motor, the servo motor, the first valve and the second valve respectively, the torque sensor is used for monitoring the torque of the sucker rod, the flow sensor is used for monitoring the crude oil outlet flow of the all-metal screw pump, the pressure sensor is used for monitoring the gas pressure in the screw pump, the liquid level detector is used for monitoring the liquid level in the well, and the standby power supply is used for supplying power to the controller and the servo motor under the condition of power failure.

Furthermore, the monitoring control mechanism comprises an oil-water analyzer, the oil-water analyzer is electrically connected with the controller, and the oil-water analyzer can analyze the oil-water proportion condition of the oil well.

Furthermore, the monitoring control mechanism comprises a video detector, the video detector is electrically connected with the controller, and the video detector is used for recording the surrounding environment condition of the mounting position of the all-metal screw pump.

Further, the monitoring control mechanism comprises a memory, and the memory is electrically connected with the controller.

Further, the torque sensor is replaced or added with a current sensor.

Further, the first clamping piece comprises two first clamping blocks, the first clamping blocks are provided with arc-shaped grooves matched with the sucker rod, the two first clamping blocks are symmetrically spliced and locked through bolts and nuts, the lower ends of the first clamping blocks extend downwards to form a torque transmission part, and the torque transmission part is in key connection with the output end of the speed reducer and can be in sliding fit in the up-and-down direction;

the second clamping piece comprises a second clamping block, a locking sleeve and a locking block, the second clamping block is provided with more than 2 clamping pieces, the locking sleeve comprises a base and a sleeve connected above the base, a tapered through hole gradually reduced from top to bottom is formed in the center of the base, the base abuts against the plane bearing, the locking block comprises a pressure head and a connecting block connected above the pressure head, the outer contour surface of the second clamping block is matched with the tapered through hole, the more than 2 clamping pieces of the second clamping block are coated on the radial periphery of the sucker rod and are arranged in the tapered through hole, the connecting block is in threaded connection with the sleeve, and the pressure head abuts against the second clamping block downwards;

the lifting assembly comprises worm gear boxes and a screw rod, a support frame is installed on the upper portion of the speed reducer, the worm gear boxes and the servo motor are installed on the support frame, the screw rod vertically penetrates through the worm gear boxes and is meshed with worm gears of the worm gear boxes, the upper ends of the screw rods are connected with the cross beam, worm gear shafts of the worm gear boxes of the two lifting assemblies are synchronous through a connecting shaft, and the servo motor is connected with the worm gear shaft of one worm gear box.

The oil extraction system comprises an elastic telescopic component, the elastic telescopic component comprises a movable part, a fixed part and an elastic part, the movable part is fixedly connected with the rotor, the fixed part is fixedly connected with the sucker rod, the movable part and the fixed part are in sliding fit in the vertical direction and can transmit torque for the sucker rod and the rotor, one end of the elastic part abuts against the movable part or the rotor, the other end of the elastic part abuts against the fixed part or the sucker rod, and the elastic part can elastically contract or elastically expand along the sliding direction of the movable part;

furthermore, the movable part is a connecting shaft, the fixed part is a connecting seat, the elastic part is a spring, the elastic telescopic assembly further comprises a limiting assembly, the connecting shaft is inserted into a cavity of the connecting seat, the connecting shaft can move along the axis direction of the connecting seat and can transmit torque by being matched with the connecting seat, the spring is sleeved outside the connecting shaft and/or the connecting seat, one end of the spring abuts against the connecting seat or the sucker rod, the other end of the spring abuts against the connecting shaft or the rotor, and the limiting assembly is used for preventing the connecting shaft from being separated from the connecting seat;

the end part of the rotor, which is adjacent to the connecting shaft, is connected with a first threaded joint, the end part of the connecting shaft, which is adjacent to the rotor, is connected with a second threaded joint, and the first threaded joint and the second threaded joint are connected through a threaded sleeve; the connecting seat is integrally formed or fixedly arranged on the sucker rod;

the limiting assembly comprises a first outer flange and a limiting plate which are in limiting fit, the first outer flange is connected to the end part, adjacent to the connecting seat, of the connecting shaft and is arranged in a protruding mode outwards in the diameter direction, and the limiting plate is connected to the end part, adjacent to the connecting shaft, of the connecting seat and is arranged in a protruding mode inwards in the diameter direction;

the connecting shaft is provided with external teeth at the end part adjacent to the first outer flange, the limiting plate is provided with internal teeth, the external teeth are meshed with the internal teeth, and the connecting shaft is provided with steps matched with the limiting plate in a limiting manner.

The utility model has the advantages as follows:

1. the abrasion of the stator and the rotor is uniform abrasion of the internal thread curved surface and the external thread curved surface, the abrasion degrees of all parts are consistent, as the internal thread curved surface and the external thread curved surface are both in a conical spiral structure and have the same taper, after being worn, the lifting mechanism drives the rotor to move downwards, so that the external thread curved surface with larger radial dimension positioned on the upper side of the rotor before moving downwards is matched with the internal spiral curved surface with larger radial dimension positioned on the lower side of the stator after being worn, the gap between the internal thread curved surface and the external thread curved surface after being adjusted is still kept to be the size before being worn, thereby ensuring the oil pumping pressure of the all-metal screw pump, ensuring that the crude oil is pumped out and maintaining higher liquid outlet amount, the service life of the all-metal screw pump is effectively prolonged, the replacement frequency of the all-metal screw pump is relatively reduced, namely, the labor hour consumption caused by replacement operation is reduced, and the crude oil exploitation efficiency is improved;

3. the intelligent degree is improved, after a and abrasion, the torque sensor monitors that the torque force is reduced, the liquid output sensor monitors that the liquid output of crude oil is reduced, the controller controls the servo motor to move the rotor downwards, the gap between the stator and the rotor is reduced until the liquid output and the torque are in a preset interval again, and then the pump efficiency is maintained, b, after the sand content of the crude oil is changed, the torque sensor monitors that the torque force is increased, the controller controls the servo motor to move the rotor upwards, the gap between the stator and the rotor is increased, the abrasion between the rotor and the stator is reduced, after the torque force is reduced, the controller controls the servo motor to move the rotor downwards, the gap between the stator and the rotor is recovered, and further the service life of the screw pump is prolonged, c, after power failure, the standby power supply is started, the standby power supply supplies power to the controller and the servo motor, the rotor is lifted for a certain distance, the distance between the inner thread curved surfaces of the conical spiral structure of the stator is increased, so that sand blocking is effectively avoided, after power is supplied, the servo motor can be controlled by the controller to lower the rotor to the original position, the gap between the stator and the rotor can be increased only by moving up a small distance even if sand blocking happens accidentally, and then the unblocking can be realized, meanwhile, the rotor and the stator are of a conical structure with a large top and a small bottom, the rotor is easy to pull out and is not easy to block, d, the sucker rod penetrates through the plane bearing and the cross beam from top to bottom, the first clamping piece and the speed reducer are in sliding fit in the up and down directions and can transmit output torque to the sucker rod, the second clamping piece is abutted against the plane bearing, the rotor is moved up and down (is adjusted in the lifting stroke of the lifting assembly), the driving motor does not need to stop, the working state can be still kept, the efficiency is improved, and if, the controller controls the servo motor to lift the rotor, increases the gap between the stator and the rotor, or controls the driving motor to reduce the rotating speed of the rotor, or stops the driving motor and controls the servo motor to lift the rotor, so as to reduce abrasion and prevent dry grinding until the liquid level rises to a preset height interval, and the controller controls the recovery of the working state; f. the pressure sensor monitors that the air pressure in the well exceeds a set range, the controller controls the shutdown driving motor and controls the servo motor to lift the rotor and close the first valve, so that crude oil in the oil pipeline falls back into the well, the second valve is opened to inject steam into the well pipe and the oil pipeline, a sleeve, a stator and the oil pipeline of the screw pump are cleaned, and specifically, thick oil is thinned through steam, and easily-solidified substances such as paraffin are softened to eliminate blockage. Namely the utility model discloses an intelligent oil recovery system can handle wearing and tearing, sand content change, have a power failure, the decline of oil well liquid level, the condition such as oil pipeline jam is monitored and is made adaptability adjustment and maintain pump efficiency, extension screw pump life, improve oil recovery efficiency, improve the security, realizes intelligent oil recovery.

Drawings

Fig. 1 is a schematic structural diagram of the present invention, in which the all-metal screw pump part only shows a part of the casing.

Fig. 2 is a schematic structural diagram of the all-metal screw pump of the present invention.

Fig. 3 is a schematic structural view of the elastic telescopic assembly of the present invention.

Fig. 4 is a schematic structural diagram of the lifting mechanism of the present invention.

Fig. 5 is a schematic structural view of a second clamping member of the present invention.

Fig. 6 is a control schematic diagram of the present invention.

Detailed Description

As shown in fig. 1 ~ and fig. 6, an intelligent oil production system using an all-metal screw pump comprises an all-metal screw pump, an oil collecting unit 43 and a steam generating unit 45,

the all-metal screw pump comprises a stator 1, a rotor 2, a sucker rod 3, a sleeve 4, a speed reducer 5 and a driving motor 48, wherein the stator 1 is provided with an internal thread curved surface, the rotor 2 is installed in the stator 1 and is provided with an external thread curved surface matched with the internal thread curved surface, the sleeve 4 is connected with the stator 1, the sucker rod 3 is installed in the sleeve 4 and is connected with the rotor 2, the driving motor 48, the speed reducer 5 and the sucker rod 3 are sequentially connected, the rotating speed of the driving motor 48 is regulated and controlled by a controller, the internal thread curved surface and the external thread curved surface are both in conical spiral structures and have the same taper, and the radial dimension D of the upper ends;

the oil collecting unit is used for storing crude oil, the steam generating unit is used for providing steam, an oil outlet 19 of the all-metal screw pump is connected with an input end of an oil conveying pipeline 42, an output end of the oil conveying pipeline 42 is respectively connected with an oil inlet of the oil collecting unit 43 and a steam outlet of the steam generating unit 45 through a tee joint 44 and a branch pipe, a first valve 46 is installed at an oil inlet of the oil collecting unit 43, a second valve 47 is installed at a steam outlet of the steam generating unit 45, the oil collecting unit is an oil collecting station, the steam generating unit is a steam station, and the oil collecting station and the steam station are existing oil extraction supporting facilities;

the oil extraction system comprises a lifting mechanism, the lifting mechanism comprises a cross beam 13, a first clamping piece 14, a second clamping piece, a plane bearing, a lifting assembly and a servo motor 33, the sucker rod 3 penetrates through the plane bearing and the cross beam 13 from top to bottom, the first clamping piece 14 is detachably and fixedly connected to the sucker rod 3 below the cross beam 13, the first clamping piece 14 and the speed reducer 5 are in sliding fit in the up-and-down direction and can transmit torque to the speed reducer 5 and the sucker rod 3, the second clamping piece is detachably and fixedly connected to the sucker rod 3 above the cross beam 13, the second clamping piece is abutted against the plane bearing, the plane bearing is installed on the cross beam 13, the two lifting assemblies are respectively arranged at two ends of the cross beam 13, output ends of the lifting assemblies are respectively and fixedly connected with the cross beam 13, and;

the oil extraction system comprises a monitoring control mechanism, the monitoring control mechanism comprises a controller 34, a torque sensor 35, a flow sensor 36, a liquid level detector 38, a pressure sensor 39, an oil-water analyzer 40, a video detector (not shown in the figure), a memory 41 and a standby power supply 37, the controller 34 is respectively connected with the torque sensor 35, the flow sensor 36, the liquid level detector 38, the pressure sensor 39, the video detector, the standby power supply 37, a driving motor 48, a servo motor 33, a first valve, a second valve, the oil-water analyzer 40 and the memory 41 in an electric control mode, the torque sensor 35 is used for monitoring the torque of the sucker rod 3, the torque sensor 35 is installed on the cross beam through a bracket and is connected with the sucker rod on the upper side of the cross beam, the flow sensor 36 is used for monitoring the crude oil outlet flow of the all-metal screw pump and, the liquid level detecting instrument 38 is used for monitoring the liquid level in the well and is installed at the top of the all-metal screw pump, namely the top of the sleeve, the pressure sensor 39 is used for monitoring the gas pressure in the well, the pressure sensor 39 is installed on the speed reducer and extends into the sleeve, the oil-water analyzer is used for monitoring the oil-water proportion condition of the oil well in different periods, the sampling unit of the oil-water analyzer is installed at the oil outlet end 49 of the all-metal screw pump, the video detector is used for recording the surrounding environment condition of the installation position of the all-metal screw pump, the sensors, the oil-water analyzer, the liquid level detecting instrument and the video detector can store monitoring data in the memory 41 for later-stage reference, and the standby power supply 37 is used for supplying power.

The first clamping piece 14 comprises two first clamping blocks 15, the first clamping blocks 15 are provided with arc-shaped grooves matched with the sucker rod 3, the two first clamping blocks 15 are symmetrically spliced and locked through bolts and nuts, the lower end of each first clamping block 15 extends downwards to form a torque transmission part 16, the torque transmission part 16 is in key connection with the output end of the speed reducer and can be in sliding fit in the up-and-down direction, and 17 is a key groove arranged at the output end of the speed reducer; the second clamping piece 18 comprises a second clamping block 19, a locking sleeve and a locking block, the second clamping block 19 is provided with more than 2 clamping pieces, the locking sleeve comprises a base 20 and a sleeve 21 connected above the base 20, the center of the base 20 is provided with a tapered through hole 22 which is tapered from top to bottom, the base 20 abuts against a plane bearing 28, the locking block comprises a pressure head 23 and a connecting block 24 connected above the pressure head 23, the outer contour surface of the second clamping block 19 is matched with the tapered through hole 22, the more than 2 clamping pieces 19 are coated on the radial periphery of the sucker rod 3 and are arranged in the tapered through hole 22, the connecting block 24 is in threaded connection with the sleeve 21, and the pressure head 23 abuts against the second clamping block 19 downwards; the second chucking block moves down under the pressure effect of latch segment and with the toper perforation cooperation of lock sleeve, embraces the sucker rod on the one hand, realizes the fixed of sucker rod, and on the other hand expands the base of lock sleeve, realizes the fixed of lock sleeve, and the setting of second mounting need not to process in addition on the sucker rod and forms the screw thread, and not only processing is convenient, can avoid corresponding sealing washer to destroy moreover.

The lifting assembly 29 comprises a worm gear box 30 and a screw rod 31, a support frame 32 is installed on the upper portion of the speed reducer 5, the worm gear box 30 and a servo motor 33 are installed on the support frame 32, the screw rod 31 vertically penetrates through the worm gear box 30 and is meshed with a worm gear of the worm gear box 30, the upper end of the screw rod is connected with the cross beam 13, worm gear shafts of the worm gear boxes 30 of the two lifting assemblies 29 are synchronous through a connecting shaft 6, the servo motor is connected with the worm gear shaft of one worm gear box 30, and synchronous lifting of the lifting assemblies is achieved.

The oil recovery system includes the flexible subassembly of elasticity, the flexible subassembly of elasticity includes the moving part, mounting and elastic component, moving part and 2 fixed connection of rotor, mounting and 3 fixed connection of sucker rod, moving part and mounting are the sliding fit of upper and lower direction and can be sucker rod 3 and 2 transmission moments of torque of rotor, the one end of elastic component supports and leans on moving part or rotor 2, the other end supports and leans on mounting or sucker rod 3, the elastic component can follow the slip direction elastic contraction or the elastic expansion of moving part. The elastic action of the elastic piece can also ensure the effective contact and sealing of the external thread surface of the rotor and the internal thread surface of the stator, so that the pressure and the pumping efficiency of the pump body are maintained, the sand is pumped out, and the sand is prevented from being stuck; through the elastic buffering of the elastic piece of the elastic telescopic assembly, the rotor can be prevented from being damaged in the assembling process.

The movable part is a connecting shaft 6, the fixed part is a connecting seat 7, the elastic part is a spring 8, the connecting shaft 6 is inserted into a cavity 9 of the connecting seat, the connecting shaft 6 can move along the axis direction of the connecting seat 7 and can transmit torque by matching with the connecting seat 7, the spring 8 is sleeved outside the connecting shaft 6, one end of the spring 8 abuts against a limiting plate 26 at the lower end of the connecting seat 7, and the other end abuts against a step 27 at the lower end of the connecting shaft 6, so that the functions of elastic expansion and elastic expansion are realized; the end part of the rotor 2 adjacent to the connecting shaft 6 is connected with a first threaded joint 10, the end part of the connecting shaft 6 adjacent to the rotor 2 is connected with a second threaded joint 11, and the first threaded joint 10 and the second threaded joint 11 are connected through a threaded sleeve 12; the connecting seat 7 is integrally formed or fixedly arranged on the sucker rod 3; the elastic telescopic assembly further comprises a limiting assembly, the limiting assembly is used for preventing the connecting shaft 6 from being separated from the connecting seat 7, the limiting assembly comprises a first outer flange 25 and a limiting plate 26 which are in limiting fit, the first outer flange 25 is connected to the end portion, adjacent to the connecting seat 7, of the connecting shaft 6 and is outwards protruded along the diameter direction, the limiting plate 26 is connected to the end portion, adjacent to the connecting shaft 6, of the connecting seat 7 and is inwards protruded along the diameter direction, and the connecting shaft 6 is prevented from being separated from the connecting seat 12 through the limiting fit of the first outer flange 11 and; connecting axle 6 is equipped with the external tooth with the adjacent tip of first outward flange 25, limiting plate 26 is equipped with the internal tooth, external tooth and internal toothing, connecting axle 6 is spline fit with limiting plate 26 promptly, connecting axle 6's upper end seted up with the spacing complex step 27 of limiting plate 26, spring 15 pressurized transition when preventing the assembly, play the guard action to spring 15, ensure spring 15 effective, connecting seat integrated into one piece is in sucker rod lower extreme or fixed mounting in sucker rod lower extreme, wherein fixed mounting can adopt the helicitic texture to realize dismantling.

The controller specifically adopts a KV-7000 PLC controller (Keynes), the flow sensor specifically adopts an LWGYC flow sensor (Nosses), the torque sensor specifically adopts a ZJ-A torque rotating speed sensor (Lanling motor), the surface detector specifically adopts an echo liquid level detector (ECHOMER, Tex. USA), the oil-water analyzer specifically adopts a Teledyne 6600 type oil-water analyzer, the first valve and the second valve specifically adopt an electromagnetic valve or an electric valve, and the controller, the flow sensor, the torque sensor, the pressure sensor, the liquid level detector, the oil-water analyzer and the memory can also adopt other models purchased in the field. In other embodiments, the torque sensor replaces or is additionally provided with a current sensor, the current sensor is used for monitoring the current of the oil pumping driving unit, the current sensor feeds a monitored current signal back to the controller, the controller judges the working condition of the oil pumping driving unit according to the current, and then adjustment is carried out.

Claims (9)

1. An intelligent oil production system applying an all-metal screw pump comprises the all-metal screw pump, an oil collecting unit and a steam generating unit;

the all-metal screw pump comprises a stator, a rotor, a pumping rod, a sleeve, a speed reducer and a driving motor, wherein the stator is provided with an internal thread curved surface, the rotor is installed in the stator and is provided with an external thread curved surface matched with the internal thread curved surface, the sleeve is connected with the stator, the pumping rod is installed in the sleeve and is connected with the rotor, and the driving motor, the speed reducer and the pumping rod are sequentially connected;

the oil collecting unit is used for storing crude oil, the steam generating unit is used for providing steam, an oil outlet of the all-metal screw pump is connected with an input end of an oil conveying pipeline, an output end of the oil conveying pipeline is respectively connected with an oil inlet of the oil collecting unit and a steam outlet of the steam generating unit, a first valve is installed at an oil inlet of the oil collecting unit, and a second valve is installed at a steam outlet of the steam generating unit;

the method is characterized in that:

the internal thread curved surface and the external thread curved surface are both conical helical structures and have the same taper;

the oil production system comprises a lifting mechanism, the lifting mechanism comprises a cross beam, a first clamping piece, a second clamping piece, a plane bearing, a lifting assembly and a servo motor, the sucker rod penetrates through the plane bearing and the cross beam from top to bottom, the first clamping piece is detachably and fixedly connected with the sucker rod below the cross beam, the first clamping piece and the speed reducer are in sliding fit in the up-and-down direction and can transmit torque to the speed reducer and the sucker rod, the second clamping piece is detachably and fixedly connected with the sucker rod above the cross beam and abuts against the plane bearing, the plane bearing is installed on the cross beam, the two lifting assemblies are respectively arranged at two ends of the cross beam, the output ends of the lifting assemblies are respectively fixedly connected with the cross beam, and the servo motor drives the lifting assemblies to do lifting movement;

the oil extraction system comprises a monitoring control mechanism, wherein the monitoring control mechanism comprises a controller, a torque sensor, a flow sensor, a pressure sensor, a liquid level detector and a standby power supply, the controller is electrically connected with the torque sensor, the flow sensor, the pressure sensor, the liquid level detector, the standby power supply, the driving motor, the servo motor, the first valve and the second valve respectively, the torque sensor is used for monitoring the torque of the sucker rod, the flow sensor is used for monitoring the crude oil outlet flow of the all-metal screw pump, the pressure sensor is used for monitoring the gas pressure in the screw pump, the liquid level detector is used for monitoring the liquid level in the well, and the standby power supply is used for supplying power to the controller and the servo motor under the condition of power failure.

2. The intelligent oil production system using the all-metal screw pump according to claim 1, wherein: the monitoring control mechanism comprises an oil-water analyzer, the oil-water analyzer is electrically connected with the controller, and the oil-water analyzer can analyze the oil-water proportion condition of the oil well.

3. The intelligent oil production system using the all-metal screw pump according to claim 1, wherein: the monitoring control mechanism comprises a video detector, the video detector is electrically connected with the controller, and the video detector is used for recording the surrounding environment condition of the mounting position of the all-metal screw pump.

4. The intelligent oil production system using the all-metal screw pump according to claim 1, wherein: the monitoring control mechanism comprises a memory, and the memory is electrically connected with the controller.

5. The intelligent oil production system using the all-metal screw pump according to claim 1, wherein: the torque sensor is replaced or added with a current sensor.

6. The intelligent oil production system using the all-metal screw pump according to claim 1, wherein: the lifting assembly comprises worm gear boxes and a screw rod, a support frame is installed on the upper portion of the speed reducer, the worm gear boxes and the servo motor are installed on the support frame, the screw rod vertically penetrates through the worm gear boxes and is meshed with worm gears of the worm gear boxes, the upper ends of the screw rods are connected with the cross beam, worm gear shafts of the worm gear boxes of the two lifting assemblies are synchronous through a connecting shaft, and the servo motor is connected with the worm gear shaft of one worm gear box.

7. The intelligent oil production system using the all-metal screw pump according to claim 1, wherein: the first clamping piece comprises two first clamping blocks, the first clamping blocks are provided with arc-shaped grooves matched with the sucker rod, the two first clamping blocks are symmetrically spliced and locked through bolts and nuts, the lower ends of the first clamping blocks extend downwards to form a torque transmission part, and the torque transmission part is in key connection with the output end of the speed reducer and can be in sliding fit in the up-and-down direction;

the second chucking spare includes second chucking piece, lock sleeve and latch segment, the second chucking piece is equipped with more than 2 lamellas, the lock sleeve includes the base and connects in the sleeve of base top, top-down convergent toper perforation has been seted up at the center of base, the base butt in on the plane bearing, the latch segment includes the pressure head and connects in the connecting block of pressure head top, the outer profile face of second chucking piece with the cooperation of toper perforation, more than 2 lamellas the cladding of second chucking piece is in the radial periphery of sucker rod and install in the toper perforation, the connecting block with sleeve threaded connection, the pressure head supports downwards and leans on the second chucking piece.

8. The intelligent oil production system using the all-metal screw pump according to claim 1, wherein: the oil recovery system includes the flexible subassembly of elasticity, the flexible subassembly of elasticity includes moving part, mounting and elastic component, the moving part with rotor fixed connection, mounting and sucker rod fixed connection, the moving part with the mounting is the sliding fit of upper and lower direction and can be the sucker rod with rotor transmission moment of torsion, the one end of elastic component supports and leans on the moving part or rotor, the other end support and lean on the mounting or the sucker rod, the elastic component can be followed the slip direction elastic contraction or the elastic expansion of moving part.

9. The intelligent oil production system using an all-metal screw pump according to claim 8, wherein: the movable part is a connecting shaft, the fixed part is a connecting seat, the elastic part is a spring, the elastic telescopic assembly further comprises a limiting assembly, the connecting shaft is inserted into a cavity of the connecting seat, the connecting shaft can move along the axis direction of the connecting seat and can transmit torque by matching with the connecting seat, the spring is sleeved outside the connecting shaft and/or the connecting seat, one end of the spring abuts against the connecting seat or the sucker rod, the other end of the spring abuts against the connecting shaft or the rotor, and the limiting assembly is used for preventing the connecting shaft from being separated from the connecting seat;

the end part of the rotor, which is adjacent to the connecting shaft, is connected with a first threaded joint, the end part of the connecting shaft, which is adjacent to the rotor, is connected with a second threaded joint, and the first threaded joint and the second threaded joint are connected through a threaded sleeve; the connecting seat is integrally formed or fixedly arranged on the sucker rod;

the limiting assembly comprises a first outer flange and a limiting plate which are in limiting fit, the first outer flange is connected to the end part, adjacent to the connecting seat, of the connecting shaft and is arranged in a protruding mode outwards in the diameter direction, and the limiting plate is connected to the end part, adjacent to the connecting shaft, of the connecting seat and is arranged in a protruding mode inwards in the diameter direction;

the connecting shaft is provided with external teeth at the end part adjacent to the first outer flange, the limiting plate is provided with internal teeth, the external teeth are meshed with the internal teeth, and the connecting shaft is provided with steps matched with the limiting plate in a limiting manner.

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