Top-mounted limit device and intelligent system for all-metal conical screw pumps

Abstract

The present invention provides an upper limit device and intelligent system for an all-metal conical screw pump, which can effectively solve the technical problems of the pump being stuck and the pumping rod jumping affecting the running stability of the pump body caused by the downward stretching of the sucker rod when the all-metal conical screw pump is operating in a deep well. The upper limit device of the all-metal conical screw pump is characterized in that it includes a connecting ring and an inner transmission sleeve, an outer transmission sleeve, a bearing and a limit block arranged in the connecting ring, the connecting ring is fixedly connected to the oil casing, the inner transmission sleeve is installed on the outer periphery of the sucker rod and is located below the outer transmission sleeve, the outer side wall of the outer transmission sleeve is threadedly matched with the inner side wall of the connecting ring, the inner ring of the bearing is installed outside the inner bearing sleeve, the outer ring of the bearing is installed inside the outer bearing sleeve, the axial ends of the outer bearing sleeve and the inner bearing sleeve are sealed, the outer bearing sleeve is supported above the outer transmission sleeve, and the limit block is installed on the outer periphery of the sucker rod and abuts against the inner bearing sleeve.

Description

Technical Field

[0001] The invention relates to the technical field of oil production equipment, in particular to auxiliary equipment of an all-metal conical screw pump, and specifically to an upper-mounted limit device and an intelligent system of the all-metal conical screw pump. Background Art

[0002] When the all-metal taper screw pump is operating in a deep well, its rotor is connected to a 2000-3000 meter sucker rod (prepared according to the depth of the well). When the sucker rod is affected by the physical state of crude oil, especially when encountering heavy oil, the sucker rod will be stretched downward. If the sucker rod is stretched by 1 thread per meter, the 2000-3000 meter sucker rod will be stretched by 2cm to 3cm as a whole, causing the pump to get stuck. In addition, when operating in a deep well, the sucker rod is affected by the verticality of the wellbore, the speed, the physical state of crude oil, etc., which is prone to instability and jumping, affecting the stability of the pump body. Summary of the invention

[0003] In response to the above problems, the present invention provides an upper limit device and an intelligent system for an all-metal conical screw pump, which can effectively solve the technical problems of pump sticking caused by the downward stretching of the sucker rod during deep well operation of the all-metal conical screw pump and the impact of sucker rod bounce on the operating stability of the pump body.

[0004] The technical scheme is as follows: the top-mounted limit device of the all-metal conical screw pump is characterized in that it includes a connecting ring and an inner transmission sleeve, an outer transmission sleeve, a bearing and a limit block arranged in the connecting ring, the connecting ring is fixedly connected to the oil casing, the inner transmission sleeve is installed on the outer periphery of the sucker rod and is located below the outer transmission sleeve, when the sucker rod is lifted, the inner transmission sleeve can be inserted into the outer transmission sleeve and matched with the outer transmission sleeve in transmission, the outer side wall of the outer transmission sleeve is threadedly matched with the inner side wall of the connecting ring, the inner ring of the bearing is installed outside the inner bearing sleeve, the outer ring of the bearing is installed in the outer bearing sleeve, the axial ends of the outer bearing sleeve and the inner bearing sleeve are sealed, the outer bearing sleeve is supported above the outer transmission sleeve, the limit block is installed on the outer periphery of the sucker rod and abuts against the inner bearing sleeve, the sucker rod passes through the inner bearing sleeve and the outer transmission sleeve in sequence from top to bottom, and the gap between the sucker rod and the inner bearing sleeve and the outer transmission sleeve constitutes an oil delivery channel.

[0005] Furthermore, the inner transmission sleeve and the outer transmission sleeve are driven by a key.

[0006] Furthermore, when the sucker rod is lifted and the inner transmission sleeve is inserted into the outer transmission sleeve, a gap communicating with the oil delivery channel is formed between the inner transmission sleeve and the outer transmission sleeve.

[0007] Furthermore, a locking washer is provided in the connecting ring, the outer bearing sleeve abuts against the locking washer, and the locking washer abuts against the outer transmission sleeve. The locking washer and the connecting ring are matched through a guide structure extending in a direction parallel to the axis of the connecting ring. The sucker rod passes through the inner bearing sleeve, the locking washer and the outer transmission sleeve in sequence from top to bottom, and the gap between the sucker rod and the inner bearing sleeve, the locking washer and the outer transmission sleeve constitutes an oil delivery channel.

[0008] Furthermore, the guide structure includes a guide flange and a guide groove extending in a direction parallel to the axis of the connecting ring, the radial ends of the outer wall of the locking washer are respectively provided with guide flanges, and the radial ends of the inner wall of the connecting ring are provided with guide grooves that cooperate with the guide flanges.

[0009] Furthermore, the axial ends of the outer bearing sleeve and the inner bearing sleeve are sealed by packing, the packing is tightened by a locking nut, and the outer side wall of the locking nut is threadedly matched with the inner side wall of the outer bearing sleeve.

[0010] The intelligent system of the all-metal conical screw pump comprises the all-metal conical screw pump and a lifting device, wherein the lifting device is used to lift or lower the sucker rod, and is characterized in that: the intelligent system also comprises the above-mentioned limit device.

[0011] Further, the rotor of the all-metal conical screw pump is connected to a rotation drive device, the rotation drive device includes a direct-drive synchronous motor, a female transmission sleeve and a male transmission sleeve, the female transmission sleeve is coaxially fixed with the sleeve portion of the rotor of the direct-drive synchronous motor, the male transmission sleeve is inserted into the female transmission sleeve, the male transmission sleeve is in transmission cooperation with the female transmission sleeve and can slide up and down relative to the female transmission sleeve, the lifting device includes a rotor lifting drive device, a clamping device and a rotation connection component, the rotor lifting drive device includes a lifting drive unit and a lifting sleeve, the lifting sleeve and the male transmission sleeve are arranged on the outside of the sucker rod from the inside to the outside, the lifting sleeve drives the rotation connection component to be lifted synchronously when it moves upward under the drive of the lifting drive unit, and drives the rotation connection component to be lowered synchronously when the lifting sleeve moves downward under the drive of the lifting drive unit;

[0012] The clamping device comprises a clamping claw, and the clamping claw can clamp and fix the sucker rod;

[0013] The rotating connection assembly includes a connecting piece and a first bearing. The upper end of the male transmission sleeve extends upward and is fixedly connected to the connecting piece after the direct-drive synchronous motor is driven. The upper end of the lifting sleeve passes through the male transmission sleeve and is rotatably matched with the connecting piece through the first bearing. The connecting piece is provided with a through hole. The sucker rod passes through the through hole and the center hole of the first bearing and is detachably connected to the clamp. The clamp is supported on the top of the connecting piece and is transmission-matched with the connecting piece.

[0014] Furthermore, the lifting drive unit is a hydraulic cylinder or a servo electric cylinder, the output shaft of the hydraulic cylinder or the servo electric cylinder is a sleeve structure with openings at both ends, the output shaft sleeve is arranged outside the sucker rod and the lower end of the transmission sleeve is supported on the upper end of the output shaft.

[0015] Furthermore, the lifting drive unit includes a worm wheel, a worm and a servo motor. The worm wheel is arranged outside the lifting sleeve and cooperates with the lifting sleeve thread. The worm is installed at the output end of the servo motor and cooperates with the worm wheel.

[0016] The upper limit device and intelligent system of the present invention, the sucker rod is supported on the inner bearing sleeve through the limit block, because the inner bearing sleeve cooperates with the outer bearing sleeve through the bearing, the outer bearing sleeve is supported on the outer transmission sleeve, the outer transmission sleeve is threadedly connected with the connecting ring, and the connecting ring is fixedly connected with the oil casing, that is, during the operation of the all-metal screw pump, the sucker rod can form a stable support through the cooperation of the limit block and the limit device, and eliminate the influence of the peripheral sense rotary motion on the connecting ring, the oil casing and other parts through the bearing, so as to avoid the pump being stuck and the pumping rod jumping caused by the downward stretching of the sucker rod and the influence of the pump body operation stability. At the same time, the limit device can cooperate with the lifting device, when the sucker rod is lifted, the inner transmission sleeve is inserted into the outer transmission sleeve, when the sucker rod rotates, it can drive the inner and outer transmission sleeves to rotate synchronously, because the outer transmission sleeve and the connecting ring are threadedly matched, when the outer transmission sleeve rotates, it can drive the inner and outer bearing sleeves to rise and fall synchronously along the axis direction of the connecting ring, so as to adjust the support height of the limit block, that is, when the pump does not need to be started, the gap between the rotor and the stator is adjusted, the pump efficiency is improved, and the service life is extended. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of the limiting device of the present invention.

[0018] Figure 2 It is a schematic cross-sectional structure diagram of the connecting ring, the outer transmission sleeve and the inner transmission sleeve of the limiting device of the present invention.

[0019] Figure 3 It is a schematic structural diagram of the lifting device of the present invention.

[0020] Figure 4 It is a schematic diagram of the cross-sectional structure of the male transmission sleeve and the female transmission sleeve of the lifting device of the present invention. DETAILED DESCRIPTION

[0021] like Figure 1As shown, the upper limit device of the all-metal conical screw pump includes a connecting ring 1 and an inner transmission sleeve 11, an outer transmission sleeve 10, a locking washer 9, a bearing 6 and a limit block 3 arranged in the connecting ring 1. The connecting ring 1 is fixedly connected to the oil casing, the inner transmission sleeve 11 is installed on the outer periphery of the sucker rod 2 and is located below the outer transmission sleeve 10, the outer wall of the outer transmission sleeve 10 is threadedly matched with the inner wall of the connecting ring 1, the locking washer 9 abuts against the outer transmission sleeve 10, and the locking washer 9 cooperates with the connecting ring 1 through a guide structure extending in a direction parallel to the axis of the connecting ring 1. The inner ring of the bearing 6 is fixedly installed outside the inner bearing sleeve 4, and the outer ring of the bearing 6 is fixedly installed in the outer bearing sleeve 5. The outer bearing sleeve 5 and the inner bearing sleeve 4 are sealed at both axial ends. Through the design of the inner and outer bearing sleeves and the packing The outer bearing sleeve 5 is abutted against the locking washer 9, and the limit block 3 is installed on the outer periphery of the sucker rod 2 and abuts against the inner bearing sleeve 4. The sucker rod 2 passes through the inner bearing sleeve 4, the locking washer 9 and the outer transmission sleeve 10 from top to bottom in sequence. The gaps between the sucker rod 2 and the inner bearing sleeve 4, the locking washer 9 and the outer transmission sleeve 10 constitute an oil delivery channel. When the sucker rod 2 is lifted, the inner transmission sleeve 11 can be inserted into the outer transmission sleeve 10 and matched with the outer transmission sleeve 10 key transmission, and the inner transmission sleeve 11 is formed with a through hole 11a that passes through from top to bottom. The through hole 11a is connected to the oil delivery channel, which can ensure that the all-metal conical screw pump can still achieve oil production during the pump efficiency adjustment process.

[0022] The guide structure includes a guide flange and a guide groove 1a extending in a direction parallel to the axis of the connecting ring 1. The radial ends of the outer wall of the locking washer 9 are respectively provided with guide flanges, and the radial ends of the inner wall of the connecting ring 1 are provided with guide grooves 1a that cooperate with the guide flanges.

[0023] The axial ends of the outer bearing sleeve 5 and the inner bearing sleeve 4 are sealed by packing 7 , and the packing 7 is tightened by a locking nut 8 , and the outer side wall of the locking nut 8 is threadedly matched with the inner side wall of the outer bearing sleeve 5 . Figure 1 In the figure, only the packing 7 at the lower ends of the outer bearing sleeve 5 and the inner bearing sleeve 4 and the locking nut 8 for tightening the packing 7 are shown.

[0024] During the operation of the all-metal conical screw pump, if the pump efficiency reaches the preset range, the height of the sucker rod remains constant. At this time, the inner transmission sleeve is located below the outer transmission sleeve, and the gap between the sucker rod and the inner bearing sleeve, the locking washer and the outer transmission sleeve constitutes the oil delivery channel; if the rotor and stator are worn, the pump efficiency is lower than the preset range, the lifting device drives the sucker rod to rise to a height of h0, the inner transmission sleeve is inserted into the outer transmission sleeve, and the outer transmission sleeve is driven by the sucker rod to rotate synchronously. Since the outer transmission sleeve and the connecting ring are threaded, the outer transmission sleeve rotates down along the connecting ring h1, and the locking washer, the inner and outer bearing sleeves, the stop block, the sucker rod and the rotor move down synchronously h1. When the sucker rod moves down again and the stop block is re-supported on the inner bearing sleeve, the stop block, the sucker rod, and the rotor move down h1 equivalent to before adjustment, so that the pump efficiency is restored to the preset range. If one adjustment cannot be restored, multiple adjustments can be made.

[0025] The intelligent system of the all-metal conical screw pump comprises the all-metal conical screw pump, a lifting device and the above-mentioned limiting device, wherein the lifting device is used for lifting or lowering the sucker rod.

[0026] The rotor of the all-metal conical screw pump is connected to the rotating drive, such as Figure 3 , Figure 4 As shown, the rotation drive device includes a direct-drive synchronous motor 12, a female transmission sleeve 13 and a male transmission sleeve 14, the female transmission sleeve 13 is coaxially fixed with the sleeve portion of the rotor of the direct-drive synchronous motor 12, the male transmission sleeve 14 is inserted into the female transmission sleeve 13, the male transmission sleeve 14 and the female transmission sleeve 13 are in transmission cooperation and can slide up and down relative to the female transmission sleeve 13, specifically, the inner hole section 13a of the female transmission sleeve and the outer contour section 14a of the male transmission sleeve are both regular hexagons, the lifting device includes a rotor lifting drive device, a clamping device and a rotation connection assembly, the rotor lifting drive device includes a lifting drive unit and a lifting sleeve 19, the lifting sleeve 19 and the male transmission sleeve 14 are arranged on the outside of the sucker rod from the inside to the outside, the lifting sleeve 19 drives the rotation connection assembly to lift when it moves upward under the drive of the lifting drive unit, and drives the rotation connection assembly to descend when the lifting sleeve 19 moves downward under the drive of the lifting drive unit;

[0027] The clamping device includes a clamping claw 18, and the clamping claw 18 can clamp and fix the sucker rod 2;

[0028] The rotating connection assembly includes a connection piece 15 (composed of an upper connection piece 15a and a lower connection piece 15b) and a first bearing. The upper end of the male transmission sleeve 14 extends upwardly and is fixedly connected to the connection piece after the direct drive synchronous motor 12 is driven. The upper end of the lifting sleeve 19 passes through the male transmission sleeve 14 and is rotatably matched with the connection piece through the first bearing 16. The connection piece is provided with a through hole. The sucker rod 2 passes through the through hole and the center hole of the first bearing 16 and is detachably connected with the clamping claw 18. The clamping claw 18 is supported on the top of the connection piece 15 and is transmission matched with the connection piece 15 through a key connection.

[0029] The lifting drive unit includes a worm wheel 22 , a worm 21 and a servo motor 20 . The worm wheel 22 is sleeved outside the lifting sleeve 19 and is threadedly matched with the lifting sleeve 19 . The worm 21 is installed at the output end of the servo motor 22 and is matched with the worm wheel 22 .

[0030] Among them, the working principle of the lifting device part in the intelligent system can be found in the utility model patent CN201921471526.2.

Claims

1. The upper limit device of the all-metal conical screw pump is characterized by: The invention relates to a novel oil pumping system, wherein the oil pumping system is installed in an outer ring and the oil pumping tube is installed in an outer ring, wherein the oil pumping tube is installed in an outer ring and the oil pumping tube is installed in an outer ring. The oil pumping tube is installed in an outer ring and the oil pumping tube is installed in an outer ring. The oil pumping tube is installed in an outer ring and the oil pumping tube is installed in an outer ring. The oil pumping tube is installed in an outer ring and the oil pumping tube is installed in an outer ring. The oil pumping tube is installed in an outer ring and the oil pumping tube is installed in an outer ring. The oil pumping tube is installed in an outer ring and the oil pumping tube is installed in an outer ring. The oil pumping tube is installed in an outer ring and the oil pumping tube is installed in an outer ring. The oil pumping tube is installed in an outer ring and the oil pumping tube is installed in an outer ring. The oil pumping tube is installed in an outer ring and the oil pumping tube is installed in an outer ring. The oil pumping tube is installed in an outer ring and the oil pumping tube is installed in an outer ring. The oil pumping tube 2. The upper limit device of the all-metal conical screw pump according to claim 1 is characterized in that: The inner transmission sleeve and the outer transmission sleeve are driven by a key.

3. The upper limit device of the all-metal conical screw pump according to claim 1 is characterized in that: When the sucker rod is lifted and the inner transmission sleeve is inserted into the outer transmission sleeve, a gap communicating with the oil delivery channel is formed between the inner transmission sleeve and the outer transmission sleeve.

4. The upper limit device of the all-metal conical screw pump according to claim 1 is characterized in that: A locking washer is also provided in the connecting ring, the outer bearing sleeve abuts against the locking washer, and the locking washer abuts against the outer transmission sleeve. The locking washer and the connecting ring are matched through a guide structure extending in a direction parallel to the axis of the connecting ring. The sucker rod passes through the inner bearing sleeve, the locking washer and the outer transmission sleeve in sequence from top to bottom, and the gap between the sucker rod and the inner bearing sleeve, the locking washer and the outer transmission sleeve constitutes an oil delivery channel.

5. The upper limit device of the all-metal conical screw pump according to claim 4 is characterized in that: The guide structure includes a guide flange and a guide groove extending in a direction parallel to the axis of the connecting ring. The radial ends of the outer wall of the locking washer are respectively provided with guide flanges, and the radial ends of the inner wall of the connecting ring are provided with guide grooves matching with the guide flanges.

6. The upper limit device of the all-metal conical screw pump according to claim 1 is characterized in that: The axial ends of the outer bearing sleeve and the inner bearing sleeve are sealed by packings, the packings are tightened by locking nuts, and the outer side wall of the locking nut is threadedly matched with the inner side wall of the outer bearing sleeve.

7. An intelligent system of an all-metal conical screw pump, comprising an all-metal conical screw pump and a lifting device, wherein the lifting device is used to lift or lower a sucker rod, and is characterized in that: The intelligent system further comprises the limiting device as claimed in any one of claims 1 to 6.

8. The intelligent system of the all-metal conical screw pump according to claim 7, characterized in that: The rotor of the all-metal conical screw pump is connected to a rotation drive device, the rotation drive device includes a direct-drive synchronous motor, a female transmission sleeve and a male transmission sleeve, the female transmission sleeve is coaxially fixed with the sleeve portion of the rotor of the direct-drive synchronous motor, the male transmission sleeve is inserted into the female transmission sleeve, the male transmission sleeve is in transmission cooperation with the female transmission sleeve and can slide up and down relative to the female transmission sleeve, the lifting device includes a rotor lifting drive device, a clamping device and a rotation connection component, the rotor lifting drive device includes a lifting drive unit and a lifting sleeve, the lifting sleeve and the male transmission sleeve are arranged on the outside of the sucker rod from the inside to the outside, the lifting sleeve drives the rotation connection component to be lifted synchronously when it moves upward under the drive of the lifting drive unit, and drives the rotation connection component to be lowered synchronously when the lifting sleeve moves downward under the drive of the lifting drive unit; The clamping device comprises a clamping claw, and the clamping claw can clamp and fix the sucker rod; The rotating connection assembly includes a connecting piece and a first bearing. The upper end of the male transmission sleeve extends upward and is fixedly connected to the connecting piece after the direct-drive synchronous motor is driven. The upper end of the lifting sleeve passes through the male transmission sleeve and is rotatably matched with the connecting piece through the first bearing. The connecting piece is provided with a through hole. The sucker rod passes through the through hole and the center hole of the first bearing and is detachably connected to the clamp. The clamp is supported on the top of the connecting piece and is transmission-matched with the connecting piece.

9. The intelligent system of the all-metal conical screw pump according to claim 8, characterized in that: The lifting drive unit is a hydraulic cylinder or a servo electric cylinder, the output shaft of the hydraulic cylinder or the servo electric cylinder is a sleeve structure with upper and lower ends opened, the output shaft sleeve is arranged outside the sucker rod and the lower end of the transmission sleeve is supported on the upper end of the output shaft.

10. The intelligent system of the all-metal conical screw pump according to claim 8, characterized in that: The lifting drive unit includes a worm wheel, a worm and a servo motor. The worm wheel is sleeved outside the lifting sleeve and cooperates with the lifting sleeve thread. The worm is installed at the output end of the servo motor and cooperates with the worm wheel.

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