Single-motor screw pump position controller

Abstract

A single-motor screw pump position controller comprises an adjusting sleeve which is used for transmission and supporting the internal structure of the adjusting sleeve; the adjusting core shaft is arranged in the adjusting sleeve, and a plurality of groups of convex structures and inclined groove structures which are matched with each other are arranged between the adjusting sleeve and the adjusting core shaft; the number of the skewed slot structures is two, the skewed slot structures are symmetrically arranged along the axis of the adjusting mandrel, and the protruding structures intermittently slide in the two skewed slots along with forward and reverse rotation of the adjusting sleeve and are used for supporting the adjusting mandrel and driving the adjusting mandrel to axially move and synchronously rotate. The rotor assembly is compact and reasonable in structure and convenient to operate, and single-motor accurate control over the rotor assembly is achieved through precise matching of the balls and the skewed slots or precise matching of the skewed teeth and the skewed slots. By means of the design, a sucker rod and a complex threaded connection mechanism in a traditional screw pump are omitted, the equipment structure is greatly simplified, and the operation stability and adaptability of equipment are remarkably improved.

Description

Technical Field

[0001] The utility model relates to the technical field of screw pumps, in particular to a single-motor screw pump position controller. Background Art

[0002] In the oil extraction industry, screw pumps, as widely used oil production equipment, their performance is directly related to the extraction efficiency and cost. However, with the continuous development of extraction technologies and the increasing complexity of oilfield environments, existing screw pump technologies are facing numerous challenges.

[0003] Firstly, during the long-term operation of traditional linear screw pumps, due to the gradually increasing gap between the stator and the rotor, the pump efficiency significantly decreases. Although conical screw pumps can adjust the stator-rotor gap to a certain extent by controlling the up and down movement of the rotor, their application in complex well conditions is still restricted by many factors. Especially in deep well operations, the long-distance extension of the sucker rod not only increases the equipment cost but also introduces many unstable factors, such as stretching caused by gravity and the influence of the crude oil mixture on the sucker rod, which seriously affect the operation stability and service life of the screw pump.

[0004] Secondly, existing adjustable screw pump position controllers mostly use threaded connections to limit and adjust the sucker rod. However, this design has significant defects: on the one hand, the threaded connection is prone to tripping during the reverse rotation of the motor, resulting in the failure of the position controller; on the other hand, due to the large weight of the sucker rod itself and the influence of the crude oil mixture, the position controller has to bear a huge axial force, which not only limits the adjustment speed and accuracy of the position controller but also exacerbates the equipment wear and failure rate.

[0005] In summary, existing screw pump position controller technologies still have many deficiencies in dealing with complex well conditions, improving operation stability, and reducing costs. Therefore, it is particularly important to develop a new type of screw pump position controller technology with a simple structure, precise adjustment, stable operation, and high cost-effectiveness. This not only helps to improve the oil extraction efficiency but also significantly reduces the equipment maintenance cost and downtime, providing strong support for the sustainable development of oilfields.

[0006] Therefore, we propose a single-motor screw pump position controller. Content of the Utility Model

[0007] The applicant of the present utility model aims at the above-mentioned disadvantages in the existing production technology and provides a single-motor screw pump position controller. By eliminating the design of the sucker rod, the overall structure of the screw pump is greatly simplified. Through the forward and reverse rotation of the motor, the forward rotation can optimize the mating gap of the stator-rotor assembly, and the reverse rotation is used for releasing stuck sand, enhancing the adaptability and reliability of the pump.

[0008] The technical solution adopted by the present utility model is as follows:

[0009] A single-motor screw pump position controller, comprising:

[0010] An adjustment sleeve, which is used for transmission and supports its internal structure;

[0011] An adjustment mandrel, which is placed inside the adjustment sleeve, and a plurality of groups of matching convex structures and inclined groove structures are arranged between the adjustment sleeve and the adjustment mandrel;

[0012] The number of the inclined groove structures is two and they are symmetrically arranged along the axis of the adjustment mandrel. The convex structure intermittently slides in the two inclined grooves as the adjustment sleeve rotates forward and backward, for supporting the adjustment mandrel, and driving the adjustment mandrel to axially displace and synchronously rotate.

[0013] Further, an inclined groove structure is arranged on the adjustment mandrel, and a corresponding convex structure is arranged on the adjustment sleeve, and the two inclined groove structures are arranged in an "eight" shape.

[0014] Further, a convex structure is arranged on the adjustment mandrel, and a corresponding inclined groove structure is arranged on the adjustment sleeve, and the two inclined grooves are arranged in an inverted "eight" shape.

[0015] Further, the two inclined grooves are respectively a positive rotation groove and a reverse rotation groove, and the vertical height of the positive rotation groove ≤ the vertical height of the reverse rotation groove, so that the axial displacement amount of the adjustment mandrel during reverse rotation is greater than the axial displacement amount of the adjustment mandrel during forward rotation.

[0016] Further, the convex structure is a ball, each group of convex structures includes a ball, and the ball is intermittently rollingly connected in the corresponding two inclined groove structures.

[0017] Further, an annular groove is opened at the lower end of the outer wall of the adjustment sleeve, at least one through-hole group is arranged on the annular groove, and the ball is arranged in the through-hole group. Each through-hole group includes two symmetric through-holes, and the annular groove extends to the lower edge of the adjustment sleeve. A first sleeve is sleeved outside the annular groove to prevent the ball from rolling outwards.

[0018] Further, the inclined groove structure includes a straight groove, a positive rotation groove and a reverse rotation groove. The positive rotation groove and the reverse rotation groove are connected in an "eight" shape and penetrate through both sides of the axially arranged straight groove, and the two straight grooves of adjacent groups are connected to each other and are arranged parallel to the axis of the adjustment mandrel.

[0019] Further, the positive rotation groove is a gentle inclined groove, and an inflection point section is arranged at the middle position of the reverse rotation groove. The front and rear sections of the inflection point section are both hypotenuses in the same direction, and the hypotenuse directions of the inflection point section are opposite.

[0020] Furthermore, the convex structure is a fixed helical tooth. The number of helical teeth in each group of convex structures is two, and they are in an upright or inverted "eight" shape. There is a gap between the two helical teeth, and the slopes of the two helical teeth and the same-side helical grooves are the same.

[0021] Furthermore, it further includes:

[0022] A threaded sleeve, which is threadedly sleeved on the side wall of the annular groove;

[0023] An extension pipe, which is fixedly connected to the lower end of the threaded sleeve and is used to support the adjustment sleeve;

[0024] A rotor assembly, which is connected to the lower end of the adjustment mandrel;

[0025] A motor connection flange, which is connected to the adjustment sleeve and is used to realize the forward and reverse rotation of the adjustment sleeve.

[0026] The beneficial effects of the present utility model are as follows:

[0027] An adjustment sleeve, which is used for transmission and supports its internal structure;

[0028] An adjustment mandrel, which is placed inside the adjustment sleeve, and multiple groups of matching convex structures and helical groove structures are provided between the adjustment sleeve and the adjustment mandrel;

[0029] The number of the helical groove structures is two and they are symmetrically arranged along the axis of the adjustment mandrel. The convex structure intermittently slides in the two helical grooves as the adjustment sleeve rotates forward and backward, which is used to support the adjustment mandrel and drive the adjustment mandrel to axially displace and synchronously rotate. The structure of the present utility model is compact and reasonable, and it is convenient to operate. Through the precise cooperation of the balls and the helical grooves or the helical teeth and the helical grooves, the precise control of the rotor assembly by a single motor is realized. This design not only eliminates the sucker rod and the complex threaded connection mechanism in the traditional screw pump, greatly simplifies the equipment structure, but also significantly improves the operation stability and adaptability of the equipment. The intermittent sliding of the balls or helical teeth in the helical grooves not only realizes the precise control of the axial displacement and synchronous rotation of the adjustment mandrel, but also ensures stable operation when the motor rotates forward and backward, effectively solving the problems of tripping and instability that easily occur in the traditional screw pump under complex well conditions. In addition, this design also supports the function of releasing stuck sand when the motor rotates in reverse, further enhancing the flexibility and safety of the screw pump during the exploitation process. In summary, this single-motor screw pump position controller has the characteristics of simple structure, precise adjustment, stable operation and high cost-effectiveness.

[0030] At the same time, the present utility model also has the following advantages:

[0031] The single-motor screw pump position controller in this embodiment achieves precise control of the rotor assembly with a single motor through innovative transmission structure design, such as the cooperation of ball bearings with inclined grooves or helical teeth with inclined grooves, without the need for complex threaded connection mechanisms and additional lifting motors, thus significantly reducing equipment costs. In addition, the use of sucker rods and hollow motors is eliminated, further reducing material costs and manufacturing difficulties. These improvement measures not only directly reduce the equipment procurement cost, but also indirectly enhance economic benefits by improving pump efficiency and reducing failure rates, bringing significant cost savings to oilfield enterprises.

[0032] The solution of the present utility model realizes precise forward and reverse control of the rotor assembly through innovative transmission and control mechanisms. This design not only supports the forward and reverse rotation operations of the motor, but also can effectively achieve the function of unclogging and sand discharging during reverse rotation, enhancing the adaptability and flexibility of the screw pump in complex well conditions. At the same time, the cooperation design of ball bearings with inclined grooves or helical teeth with inclined grooves ensures the stability and high efficiency during the transmission process, enabling the screw pump to maintain stable operating performance under different working conditions. Brief Description of the Drawings

[0033] Figure 1 It is a schematic structural diagram of the present utility model.

[0034] Figure 2 is Figure 1 a cross-sectional view taken along the A-A section in

[0035] Figure 3 It is an exploded view of the present utility model.

[0036] Figure 4 It is a schematic structural diagram of the adjusting mandrel in the first embodiment of the present utility model.

[0037] Figure 5 It is a schematic structural diagram of the adjusting sleeve in the present utility model.

[0038] Figure 6 It is a schematic structural diagram of the connection structure of the helical teeth on the adjusting mandrel and the corresponding adjusting sleeve in the second embodiment of the present utility model.

[0039] Figure 7 It is a schematic structural diagram of the connection structure of the helical teeth on the adjusting sleeve and the corresponding adjusting mandrel in the second embodiment of the present utility model.

[0040] Wherein:

[0041] 100, adjusting mandrel; 200, adjusting sleeve; 201, annular groove; 202, through hole; 300, first sleeve; 400, threaded sleeve; 500, extension pipe; 600, motor connection flange; 700, ball bearing; 700', helical teeth; 800, inclined groove structure; 801, straight groove; 802, positive rotation groove; 803, reverse rotation groove. Detailed implementation manners

[0042] The following combines with the attached drawings to illustrate the detailed implementation manners of the present utility model.

[0043] As Figure 1 shown, this embodiment discloses a single-motor screw pump position controller, which includes an adjustment mandrel 100, an adjustment sleeve 200, a threaded sleeve 400 and an extension pipe 500. At the same time, a rotor assembly is also connected to the lower end of the adjustment mandrel 100, aiming to solve the problems of high cost, complex structure and unstable operation brought by the traditional screw pump relying on sucker rods. Through the innovative cooperation of the ball and the inclined groove structure, precise control and efficient drive of the rotor assembly are realized.

[0044] The following elaborates on each component in combination with the attached drawings:

[0045] The adjustment sleeve 200 in this embodiment is used for transmission and supports its internal structure;

[0046] The adjustment mandrel 100 in this embodiment is placed inside the adjustment sleeve 200, and a plurality of groups of matching convex structures and inclined groove structures 800 are provided between the adjustment sleeve 200 and the adjustment mandrel 100;

[0047] The number of the inclined groove structures 800 in this embodiment is two and they are symmetrically arranged along the axis of the adjustment mandrel 100. The convex structures intermittently slide in the two inclined grooves as the adjustment sleeve 200 rotates forward and backward, which is used to support the adjustment mandrel 100, drive the adjustment mandrel 100 to axially displace and rotate synchronously, thereby driving the rotor assembly to rotate forward and backward. When the rotor assembly rotates forward, oil production work is realized, and when the rotor assembly rotates backward, a stuck release effect can be achieved;

[0048] The threaded sleeve 400 in this embodiment is threadedly sleeved on the side wall of the annular groove 201 to improve the overall stability;

[0049] The extension pipe 500 in this embodiment is fixedly connected to the lower end of the threaded sleeve 400 and is used to support the adjustment sleeve 200.

[0050] The motor connection flange 600 is connected to the adjustment sleeve 200 to realize the forward and reverse rotation of the adjustment sleeve 200.

[0051] In this embodiment, the adjustment mandrel 100 is provided with inclined groove structures 800, and corresponding convex structures are provided on the adjustment sleeve 200, and the two inclined groove structures 800 are arranged in an "eight" shape.

[0052] In another embodiment, a convex structure is provided on the adjusting mandrel 100, and a corresponding inclined groove structure 800 is provided on the adjusting sleeve 200, and the two inclined grooves are arranged in an inverted "eight" shape.

[0053] By adjusting the installation positions of the convex structure and the inclined groove structure 800, the structural layout of the inclined grooves in the inclined groove structure 800 is adjusted, so as to achieve better effects.

[0054] As Figure 4 and Figure 7 shown, the two inclined grooves are respectively a positive rotation groove 802 and a reverse rotation groove 803, and the vertical height of the positive rotation groove 802 ≤ the vertical height of the reverse rotation groove 803, so that the axial displacement amount when the adjusting mandrel 100 rotates reversely is greater than the axial displacement amount when the adjusting mandrel 100 rotates forward, so that when the adjusting mandrel 100 flips, its axial displacement degree is greater, thereby improving the effect of releasing stuck sand and discharging sand.

[0055] Embodiment 1

[0056] As Figures 2-4 shown, in this embodiment, the convex structure is a ball 700, each group of convex structures includes one ball 700, and the ball 700 is intermittently and rotatably connected in the corresponding two inclined groove structures 800.

[0057] The ball 700 in this embodiment serves as a transmission medium. Each group of balls is arranged in a through-hole group, and by intermittently rolling in the inclined groove structure 800, the support and drive of the adjusting mandrel are realized.

[0058] An annular groove 201 is opened at the lower end of the outer wall of the adjusting sleeve 200. At least one through-hole group is provided on the annular groove 201, and each through-hole group includes two symmetrical through-holes 202 for accommodating the ball 700. The annular groove 201 extends to the lower edge of the adjusting sleeve 200, facilitating the installation and fixation of subsequent components.

[0059] The ball 700 is arranged in the through-hole group. A first sleeve 300 is sleeved outside the annular groove 201 to prevent the ball 700 from rolling outwards. The threaded sleeve 400 is threadedly connected to the annular groove 201 and is fixedly connected to the first sleeve 300 and the extension sleeve 500 by welding to ensure the stability and sealing performance of the overall structure.

[0060] In this embodiment, the inclined groove structure 800 on the adjusting mandrel 100 includes a straight groove 801, a positive rotation groove 802 and a reverse rotation groove 803. The positive rotation groove 802 is a gentle inclined groove, while an inflection point section 804 is provided in the middle of the reverse rotation groove 803, and the hypotenuse directions of the front and rear sections of the inflection point section 804 are opposite. This design can generate axial vibration during reverse rotation, which helps to discharge sand.

[0061] The specific working principle in this embodiment is as follows:

[0062] Forward rotation operation: When the motor rotates forward, it drives the adjustment sleeve 200 to rotate, and the ball 700 rolls in the inclined groove accordingly. It rolls from the straight groove into the positive rotation groove, pushing the adjustment mandrel 100, the eccentric rod, and the rotor assembly upward. After adjusting the clearance between the stator and rotor assembly to the set value, the ball 700 is relatively fixed with the adjustment mandrel 100, and the two rotate synchronously, and the screw pump starts to work normally.

[0063] Reverse rotation for stuck release: When the stator and rotor assembly is stuck by sand and gravel, the motor rotates in reverse, and the ball 700 rolls from the straight groove into the reverse rotation groove, driving the adjustment mandrel 100 and the rotor assembly to further lift, increasing the clearance between the stator and rotor, and realizing stuck release and sand discharge. The special design of the reverse rotation groove enhances the sand discharge effect.

[0064] Shutdown and restart: During shutdown, the adjustment mandrel 100 sinks under the action of gravity, and the ball 700 rolls back into the straight groove. During restart, the ball 700 moves in a new row of inclined grooves, and the upward lift and synchronous rotation are realized again.

[0065] In this embodiment, through the innovative design of the ball 700 and the inclined groove structure 800, precise control and efficient drive of the rotor assembly by a single motor are achieved. Compared with traditional screw pumps, it has the following remarkable advantages:

[0066] The sucker rod and the hollow motor are omitted, the structure is greatly simplified, and the material cost is reduced. The design of the ball 700 reduces friction and improves the transmission efficiency and stability.

[0067] The motor speed can be increased to 3000 revolutions per minute, significantly improving the pump efficiency and production efficiency.

[0068] It supports the forward and reverse rotation of the motor, is suitable for different well conditions, especially for stable operation in horizontal wells.

[0069] The segmented design facilitates installation, disassembly and maintenance, and improves the maintainability of the equipment.

[0070] Embodiment II

[0071] As Figure 7 and Figure 7 shown, the convex structure in this embodiment is the helical tooth 700', and through the cooperation of the fixed helical tooth 700' and the inclined groove structure 800, precise control of the rotor assembly is achieved. This solution has stronger stability under specific working conditions.

[0072] The helical tooth 700' is arranged on the adjustment mandrel 100 or the adjustment sleeve 200, and the number is two, showing an upright or inverted "eight" - shaped layout. The inclined groove is correspondingly arranged on the other component to form a matching relationship. The slope of the helical tooth 700' is the same as that of the inclined groove to ensure stability during the transmission process.

[0073] As Figure 7As shown, the helical gear 700' is arranged on the adjusting mandrel 100. At this time, the inclined groove structure 800 is an inverted "eight" - shaped structure.

[0074] As Figure 7 shown, the helical gear 700' is arranged on the adjusting sleeve 200. At this time, the inclined groove structure 800 is an upright "eight" - shaped structure.

[0075] Both of the above - mentioned layouts can achieve the separation of the helical gear 700' from the inclined groove structure 800 when the machine stops, which is convenient for forward and reverse drive adjustment.

[0076] There is a gap between the two helical gears 700' to avoid interference during movement.

[0077] Meanwhile, in order to limit the helical gear 700', a limiting part is arranged at the end of the inclined groove structure 800 to prevent the helical gear 700' from moving excessively.

[0078] Its specific working principle is the same as that of Embodiment 1, that is, the helical gear 700' cooperates with the inclined groove structure 800, which can achieve the axial movement of the adjusting mandrel 100 by a certain distance. At the same time, it can also rotate forward and backward to achieve the effects of driving and unjamming.

[0079] The working principle of this embodiment is similar to that of Embodiment 1, but the transmission medium changes from the ball 700 to the helical gear 700'. When the motor rotates, it drives the helical gear 700' on the adjusting sleeve 200 or the adjusting mandrel 100 to move in the inclined groove, so as to achieve precise control of the adjusting mandrel 100 and the rotor assembly. When rotating forward, the stator - rotor gap is lifted, and when rotating backward, unjamming and sand discharging are achieved.

[0080] The fixed cooperation between the helical gear 700' and the inclined groove reduces the unstable factors in the transmission process and improves the overall stability.

[0081] In some working conditions that require higher transmission accuracy and stability, the contact surface between the helical gear 700' and the inclined groove structure 800 is larger, thus improving the supporting effect and making the overall stability higher.

[0082] In summary, the helical gear 700' - type single - motor screw pump position controller solution provided by this embodiment has significant advantages under specific working conditions, complements the ball 700 - type solution, and jointly constitutes a complete solution for the single - motor screw pump position controller.

[0083] The above description is an explanation of the present invention, not a limitation of the invention. The scope defined by the present invention can be seen in the claims. Within the protection scope of the present invention, any form of modification can be made.

Claims

1. A single-motor screw pump position controller, characterized in that, Comprising: An adjusting sleeve (200) for transmission and supporting its internal structure; An adjusting mandrel (100) placed inside the adjusting sleeve (200), and multiple groups of matching convex structures and inclined groove structures (800) are provided between the adjusting sleeve (200) and the adjusting mandrel (100); The number of the inclined groove structures (800) is two and they are symmetrically arranged along the axis of the adjusting mandrel (100). The convex structures intermittently slide in the two inclined grooves as the adjusting sleeve (200) rotates forward and backward, for supporting the adjusting mandrel (100), and driving the axial displacement and synchronous rotation of the adjusting mandrel (100).

2. The single-motor screw pump position controller according to claim 1, characterized in that, The adjusting mandrel (100) is provided with inclined groove structures (800), and corresponding convex structures are provided on the adjusting sleeve (200), and the two inclined groove structures (800) are arranged in an "eight" shape.

3. The single-motor screw pump position controller according to claim 2, characterized in that, The adjusting mandrel (100) is provided with convex structures, and corresponding inclined groove structures (800) are provided on the adjusting sleeve (200), and the two inclined grooves are arranged in an inverted "eight" shape.

4. The single-motor screw pump position controller according to claim 3, characterized in that, The two inclined grooves are respectively a positive rotation groove (802) and a reverse rotation groove (803), and the vertical height of the positive rotation groove (802) ≤ the vertical height of the reverse rotation groove (803), so that the axial displacement amount when the adjusting mandrel (100) rotates reversely is greater than the axial displacement amount when the adjusting mandrel (100) rotates forward.

5. The single-motor screw pump position controller according to claim 4, wherein The convex structure is a ball (700), each group of convex structures includes a ball (700), and the ball (700) is intermittently and rotatably connected in the corresponding two inclined groove structures (800).

6. The single-motor screw pump position controller according to claim 5, characterized in that, The lower end of the outer wall of the adjusting sleeve (200) is provided with an annular groove (201), at least one through-hole group is provided on the annular groove (201), and the balls (700) are arranged in the through-hole group. Each through-hole group includes two symmetric through-holes (202), and the annular groove (201) extends to the lower edge of the adjusting sleeve (200). A first sleeve (300) is sleeved outside the annular groove (201) to prevent the balls (700) from rolling outwards.

7. The single-motor screw pump position controller according to claim 6, wherein The inclined groove structure (800) includes a straight groove (801), a positive rotation groove (802) and a reverse rotation groove (803). The positive rotation groove (802) and the reverse rotation groove (803) are connected in an "eight" shape and penetrate through both sides of the axially arranged straight groove (801), and the two straight grooves (801) of adjacent groups are connected to each other and are parallel to the axis of the adjusting mandrel (100).

8. A single-motor screw pump position controller according to claim 7, characterized in that, The positive rotation groove (802) is a gentle inclined groove, and an inflection point section (804) is provided at the middle position of the reverse rotation groove (803). The front and rear sections of the inflection point section (804) are both hypotenuses in the same direction, and the hypotenuse directions of the inflection point section (804) are opposite.

9. The single-motor screw pump position controller according to claim 1, wherein The convex structure is a fixed helical tooth (700'), the number of helical teeth (700') in each group of convex structures is two and they are arranged in an upright or inverted "eight" shape, a gap is provided between the two helical teeth (700'), and the slopes of the two helical teeth (700') and the inclined groove on the same side are the same.

10. The single-motor screw pump position controller according to claim 6, wherein, Also comprising: A threaded sleeve (400) threadedly sleeved on the side wall of the annular groove (201); An extension pipe (500) fixedly connected to the lower end of the threaded sleeve (400) and used to support the adjustment sleeve (200); A rotor assembly connected to the lower end of the adjustment mandrel (100); A motor connection flange (600) connected to the adjustment sleeve (200) for realizing the forward and reverse rotation of the adjustment sleeve (200).

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