Ground drive screw pump sand spinner and method

Abstract

The application discloses a ground driving screw pump sand rotating device and method, an oil pumping rod, a screw pump and a sand rotator are sequentially connected at the lower end of a driving head, meanwhile, a liquid discharge hole and a sand discharge hole are formed in the sand rotator, the screw pump drives the sand rotator to rotate rapidly to generate centrifugal force to separate oil, sand and gas, sand enters a lower pipe column through the sand discharge hole, and oil enters the screw pump through the liquid discharge hole, so that the oil and sand are effectively separated, the device does not rely on the centrifugal force of liquid self-rotation, but can separate oil and sand through the separation force generated by the sand rotator, is suitable for application in oil extraction with various scales of displacement, direct contact between sand and the screw pump is avoided through the sand rotator, damage of sand to the screw pump is reduced, the device not only has the effect of active sand prevention, but also can prolong the service life of the screw pump, improve oil extraction efficiency, reduce cost, and solve the problems of poor oil and sand separation effect, low service life of the screw pump and high oil extraction cost in the prior art.

Description

Technical Field

[0001] The invention belongs to the field of oil extraction equipment technology and relates to a ground-driven screw pump sand-rotating device and method. Background Technology

[0002] The surface-driven all-metal screw pump is a type of oil well lifting equipment developed in recent years. Its working principle is similar to that of a traditional screw pump. Multiple chambers are formed within the pump through the meshing motion between the stator and rotor. The fluid is continuously pushed axially as the rotor rotates, completing the conversion between mechanical energy and liquid energy within the pump, thus achieving the fluid lifting process. A key feature of the all-metal screw pump is the replacement of the traditional rubber stator with an all-metal stator, which offers superior wear resistance, corrosion resistance, and high-temperature resistance. During operation, the stator and rotor are in a clearance fit, resulting in relatively low internal friction, easier pump start-up, and more energy-efficient operation. Due to its temperature resistance up to 350℃, the surface-driven all-metal screw pump is being used as a dual-purpose injection and pumping pump in newly commissioned SAGD projects, primarily for lifting high-temperature heavy oil wells. However, due to cost and other factors, its current application is relatively limited.

[0003] Currently, sand control in oil wells primarily relies on installing spiral gas-sand anchors under a surface-driven all-metal screw pump. This method requires a certain fluid flow velocity. When the mixture enters the anchor tube, it rotates along the spiral surface. Utilizing the density difference between the liquid and solid phases, the denser solid particles are thrown to the outer ring under varying centrifugal forces. However, relying solely on the liquid's own flow velocity to generate centrifugal force results in weak separation of sand and liquid, leading to poor effectiveness. In small- to medium-displacement oil production, it cannot effectively separate liquid and sand. Furthermore, the surface-driven all-metal screw pump lifting process has been found to have a shorter lifespan in wells with high sand content, mainly because sand production in the well affects the pump's lifespan. Summary of the Invention

[0004] The purpose of this invention is to solve the problems in the prior art and provide a ground-driven screw pump sand-rotating device and method. A sand-rotor is added to the tubing column. The driving force of the screw pump rotor drives the sand-rotor to rotate, generating centrifugal force to separate oil, gas and sand. The sand enters the lower tubing column, preventing sand from entering the screw pump, thereby achieving the effect of active sand prevention.

[0005] To achieve the above objectives, the invention employs the following technical solution:

[0006] A ground-driven screw pump vortexing device includes a drive head, a Christmas tree, a sucker rod, tubing, casing, a screw pump, a vortexer, and a tailpipe;

[0007] The drive head is connected to the upper end of the wellhead, the lower end of the wellhead is connected to the casing, the tubing is located inside the casing, and the upper end of the tubing passes through the wellhead and is connected to the drive head.

[0008] The sucker rod is installed inside the tubing, with its upper end connected to the oil pipe. The lower ends of the sucker rod and the tubing are respectively connected to the screw pump. The lower end of the screw pump is connected in sequence to the vortex generator and the tailpipe.

[0009] The sander has a sand discharge hole and a liquid discharge hole, and the liquid discharge hole can connect the sander and the screw pump.

[0010] A further improvement of the present invention is that:

[0011] The vortexer includes a vortexer rotor and a vortexer outer cylinder;

[0012] The screw pump is connected to the cyclone separator rotor via an internal screw pump rotor.

[0013] The upper end of the cyclone separator rotor is connected to the tail end of the screw pump rotor. Several sets of spiral blades are arranged circumferentially on the side wall of the cyclone separator rotor. The upper end of the screw pump rotor is connected to the lower end of the sucker rod.

[0014] The tail end of the screw pump rotor has a cone-shaped structure, and the tail end of the screw pump rotor is inserted into the rotor of the sander.

[0015] The screw pump rotor and the cyclone separator rotor are fitted with a clearance.

[0016] The vortexer is provided with a connecting surface, and a connecting hole is opened on the connecting surface. The rotor of the vortexer is connected to the rotor of the screw pump through the connecting hole, and the drain hole is opened on the connecting surface.

[0017] The drainage holes are in several groups and are circumferentially opened on the connecting surface.

[0018] The lower end of the outer cylinder of the vortexer is connected to the tail pipe through the tail end of the vortexer.

[0019] The vortexer and tailpipe are connected by an anti-rotation anchor.

[0020] A ground-driven screw pump sand-rotating method includes the following steps:

[0021] The drive head drives the sucker rod to rotate, and the sucker rod drives the sander to rotate through the screw pump. The underground oil enters the sander through the tailpipe. As the sander rotates, the liquid forms centrifugal force, and the sand particles are discharged from the sand discharge hole. The liquid enters the screw pump from the liquid discharge hole and rises to the ground.

[0022] A further improvement to this method is that it also includes the following steps:

[0023] The vortexer includes a vortexer rotor and a vortexer outer cylinder, and several sets of spiral blades are arranged on the side of the vortexer rotor.

[0024] The underground oil enters the outer cylinder of the sander through the tail end of the sander. The rotor and spiral blades of the sander drive the underground oil to rotate under the action of the screw pump until the fluid and sand particles are separated.

[0025] Compared with the prior art, the invention has the following beneficial effects:

[0026] This invention discloses a ground-driven screw pump sand-rotating device. A sand-rotator is installed at the lower end of the screw pump, with a drain hole and a sand discharge hole. The screw pump drives the sand-rotator to rotate rapidly, generating centrifugal force to separate oil, sand, and gas. Sand enters the lower tubing through the sand discharge hole, while oil enters the screw pump through the drain hole. This effectively separates oil and sand particles. This device does not rely on the centrifugal force of the liquid's own rotation; oil and sand separation can be achieved through the separation force generated by the sand-rotator. It is suitable for application in oil production with various displacement scales. At the same time, the sand-rotator also avoids direct contact between sand and the screw pump, reducing sand damage to the screw pump. It not only has an active sand-prevention effect but also extends the service life of the screw pump, improves oil production efficiency, and reduces costs.

[0027] Furthermore, in this invention, a connecting surface is provided on the outer cylinder of the cyclone separator, through which the cyclone separator rotor and the screw pump rotor are connected. A drain hole is opened on the connecting surface. The connecting surface effectively isolates the sand particles from the screw pump, allowing only the separated oil to enter the screw pump, thus significantly extending the life of the screw pump and reducing the cost of oil extraction.

[0028] Furthermore, in this invention, the vortexer and the tailpipe are connected by an anti-rotation anchor, which can fix the oil pipe and prevent the oil pipe threads from loosening when the screw pump rotates.

[0029] This invention also discloses a ground-driven screw pump sand-rotating method. During oil extraction, the ground drive head rotates to transmit power to the sand-rotator. The rotation speed is fast and does not rely on the centrifugal force of the oil itself. The separation effect is better than the passive sand-control effect of the spiral gas sand anchor under the ground-driven all-metal screw pump. During oil extraction, the sand-rotator directly improves the service life of the ground-driven all-metal screw pump and reduces the overall operating cost of oil extraction equipment. Attached Figure Description

[0030] To more clearly illustrate the technical solutions of the embodiments of the invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the structure of the present invention;

[0032] Figure 2 This is a structural diagram of the sander of the present invention;

[0033] Figure 3 This is a first partial structural diagram of the present invention;

[0034] Figure 4 This is a second partial structural diagram of the present invention.

[0035] Wherein: 1-Drive head; 2-Earth conditioner; 3-Sucker rod; 4-Tubing; 5-Casing; 6-Screw pump; 7-Switcher; 8-Anti-rotation anchor; 9-Tail pipe; 10-Screw pump rotor; 11-Switcher outer cylinder; 12-Bearing; 13-Drain hole; 14-Switcher rotor; 15-Helical blade; 16-Sand discharge hole; 17-Switcher tail end. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of the invention clearer, the technical solutions of the embodiments of the invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the invention, not all embodiments. The components of the embodiments of the invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0038] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0039] In the description of the embodiments of the invention, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the invention is conventionally placed during use, they are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the invention. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0040] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0041] In the description of the embodiments of the invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the invention according to the specific circumstances.

[0042] The invention will now be described in further detail with reference to the accompanying drawings:

[0043] See Figure 1-2 This invention discloses a ground-driven screw pump swirl device, including a drive head 1, a tree trunk 2, a sucker rod 3, tubing 4, casing 5, a screw pump 6, a swirler 7, an anti-rotation anchor 8, a tailpipe 9, a screw pump rotor 10, a swirler outer cylinder 11, a bearing 12, a drain hole 13, a swirler rotor 14, a spiral blade 15, a sand discharge hole 16, and a swirler tail end 17. The drive head 1 is connected to the upper end of the wellhead 2, the lower end of the wellhead 2 is connected to the casing 5, the tubing 4 is located inside the casing 5, and the upper end of the tubing 4 is connected to the wellhead 2; the sucker rod 3 is located inside the tubing 4, the upper end of the sucker rod 3 penetrates the interior of the wellhead 2 and is connected to the drive head 1, the lower ends of the sucker rod 3 and the tubing 4 are respectively connected to the screw pump 6, the screw pump 6 is equipped with a screw pump rotor 10, the upper and lower ends of the screw pump rotor 10 are respectively connected to the sucker rod 3 and the vortex rotor 14 inside the vortex 7, the vortex outer cylinder 11 is located outside the vortex rotor 14, and the upper end of the vortex outer cylinder 11 is connected to the screw pump 6.

[0044] The outer cylinder 11 of the cyclone separator has a connecting surface near the screw pump 6. A connecting hole is provided on this surface, through which the cyclone separator rotor 14 passes. The upper part of the connecting surface is connected to the screw pump rotor 10 via a bearing 12. Several sets of spiral blades 15 are arranged circumferentially on the lower part of the screw pump 6. Several sets of drain holes 13 are formed circumferentially along the cyclone separator rotor 15 on the connecting surface of the outer cylinder 11. These drain holes 13 connect the outer cylinder 11 and the screw pump 6, allowing the separated oil to enter the lower end of the screw pump 6 through the drain holes. The oil is then pumped to high pressure and lifted to the ground. The connecting surface also prevents sand particles from directly entering the screw pump 6, extending its lifespan.

[0045] See Figure 3 Furthermore, in this embodiment of the invention, the tail end 10 of the screw pump rotor adopts a conical structure, which is inserted and connected to the upper end of the vortexer rotor 14, and guides the vortexer rotor 14 to rotate. Since the tail end of the screw pump rotor 10 has a swing, a large clearance fit is adopted to ensure that torque can be transmitted.

[0046] See Figure 4 Furthermore, in this embodiment of the invention, the outer cylinder 11 of the vortexer is connected to the tail end 17 of the vortexer, and the tail end 17 of the vortexer is connected to the tail pipe 9. Oil enters from the tail end 17 of the vortexer. Under the rotation of the rotor 14 and the spiral blades 15 of the vortexer, the liquid generates centrifugal force, discharging the sand particles from the sand discharge hole 16. The liquid itself enters the bottom of the screw pump 6 from the drain hole 13 of the vortexer, forming a high-pressure liquid that is then lifted to the ground.

[0047] This invention also discloses a ground-driven screw pump sand-rotating method, comprising the following steps:

[0048] When the screw pump 6 is inserted into the well, it is connected to the anti-rotation anchor 8 and then to the tubing 4. The drive head 1 rotates to drive the sucker rod 3 to transmit torque to the screw pump rotor 10. The rotation of the screw pump rotor 10 draws the oil into the tubing 4 and lifts it to the surface.

[0049] The drive head 1 drives the sucker rod 3 to rotate, and the sucker rod 3 transmits torque to the screw pump 6. The tail end of the screw pump 6 drives the vortex separator 7 to rotate. When the rotor of the vortex separator 7 rotates, it generates centrifugal force, which separates the liquid and sand. The sand enters the tailpipe 9, and the liquid enters the screw pump 6 and is lifted to the ground. Under the action of the vortex separator 7, the sand in the oil is separated and does not flow through the screw pump 6, thus protecting the pump and extending the service life of the system.

[0050] Specifically, the oil enters the outer cylinder 11 of the sander from the tail end of the sander 7. Under the rotation of the sander rotor 14 and the spiral blade 15, the liquid forms centrifugal force, which discharges the sand particles from the sand discharge hole 16. The liquid enters the bottom of the screw pump 6 through the drain hole 13 on the upper connecting surface of the outer cylinder 11 of the sander.

[0051] The screw pump 6 described in this embodiment of the invention is an all-metal screw pump.

[0052] This invention represents the first application of a sand control device and method in mechanical oil production. This type of active swirling sand control method has not been used in all-metal screw pump oil production processes. Because this sand control method uses a drive shaft to transmit power, its rotation speed is high, and the separation effect is better than previous under-pump sand control methods. This directly improves the service life of the all-metal screw pump and reduces the overall operating cost of oil production equipment.

[0053] The above are merely preferred embodiments of the invention and are not intended to limit the invention. Various modifications and variations can be made to the invention by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the invention should be included within the scope of protection of the invention.

Claims

1. A ground-driven screw pump swirl sand device, characterized in that, It includes a drive head (1), a tree trunk (2), a sucker rod (3), tubing (4), casing (5), a screw pump (6), a vortexer (7), and a tailpipe (9); The drive head (1) is connected to the upper end of the tree (2), the lower end of the tree (2) is connected to the casing (5), the tubing (4) is located inside the casing (5), and the upper end of the tubing (4) is connected to the tree (2). The sucker rod (3) is installed inside the tubing (4). The upper end of the sucker rod (3) passes through the tree (2) and is connected to the drive head (1). The lower ends of the sucker rod (3) and the tubing (4) are respectively connected to the screw pump (6). The lower end of the screw pump (6) is connected to the sander (7) and the tailpipe (9) in sequence. The sander (7) has a sand discharge hole (16) and a liquid discharge hole (13), and the liquid discharge hole (13) can connect the sander (7) and the screw pump (6). The vortexer (7) includes a vortexer rotor (14) and a vortexer outer cylinder (11). The screw pump (6) is connected to the sander rotor (14) through the internal screw pump rotor (10); The sidewall of the vortexer rotor (14) is provided with several sets of spiral blades (15), and the upper end of the screw pump rotor (10) is connected to the lower end of the sucker rod (3). The sander (7) is provided with a connecting surface, and a connecting hole is opened on the connecting surface. The sander rotor (14) is connected to the screw pump rotor (10) through the connecting hole, and the drain hole (13) is opened on the connecting surface. The tail end of the screw pump rotor (10) is a cone structure, and the tail end of the screw pump rotor (10) is inserted into the sand vortexer rotor (14). The screw pump rotor (10) and the sander rotor (14) are fitted with a clearance.

2. The ground-driven screw pump sand-rotating device according to claim 1, characterized in that, The drain holes (13) are in several groups and are circumferentially opened on the connecting surface.

3. The ground-driven screw pump sand-rotating device according to claim 1, characterized in that, The lower end of the outer cylinder (11) of the sander is connected to the tail pipe (9) through the tail end (17) of the sander.

4. The ground-driven screw pump sand-rotating device according to claim 1, characterized in that, The vortexer (7) and the tailpipe (9) are connected by an anti-rotation anchor (8).

5. A sand-spinning method based on the ground-driven screw pump sand-spinning device according to claim 1, characterized in that, Includes the following steps: The drive head (1) drives the sucker rod (3) to rotate. The sucker rod (3) drives the sander (7) to rotate through the screw pump (6). The underground oil enters the sander (7) through the tailpipe (9). Under the rotation of the sander (7), the liquid forms centrifugal force, and the sand particles are discharged from the sand discharge hole (16). The liquid enters the screw pump (6) from the drain hole (13) and rises to the ground.

6. The sand-spinning method of a ground-driven screw pump sand-spinning device according to claim 5, characterized in that, It also includes the following steps: The sander (7) includes a sander rotor (14) and a sander outer cylinder (11), and several sets of spiral blades (15) are arranged on the side of the sander rotor (14). The underground oil enters the outer cylinder (11) of the sander through the tail end of the sander (7). The rotor (14) and the spiral blades (15) of the sander drive the underground oil to rotate under the action of the screw pump until the body fluid and sand particles are separated.

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