High-liquid-flow-disturbance solid-carrying mud-carrying screw pump oil extraction system
By setting up a return channel and return port inside the screw pump, combined with a return oil pump and a check valve, the problem of insufficient fluid flow disturbance in the electric submersible screw pump was solved, achieving efficient discharge of sludge and solid impurities, and improving oil production efficiency and equipment life.
Patent Information
- Application Number
- CN202511994042.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-26
- Publication Date
- 2026-02-17
AI Technical Summary
Existing electric submersible screw pumps have low fluid flow disturbance during oil extraction, making it difficult to remove silt and solid impurities, reducing oil production efficiency and shortening service life.
A high-fluid-flow-disturbance solid-carrying mud-carrying screw pump oil production system is designed. By setting a return fluid channel and return fluid port inside the screw pump, the fluid flow disturbance is increased. Combined with the return oil pump and check valve, impurities are effectively discharged.
It improves the internal fluid flow disturbance of the screw pump, effectively removes mud and solid impurities, and enhances oil production efficiency and service life.
Smart Images
Figure CN121539474A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of oilfield production equipment technology, and in particular to a high fluid flow disturbance solid-carrying mud-carrying screw pump oil production system. Background Technology
[0002] As we all know, the consumption and utilization of energy are essential guarantees for the sustainable development of science and technology and the realization of modernization. Petroleum, hailed as the "lifeblood of industry," is an indispensable energy source. Vast reserves of petroleum exist on Earth, both underground and in the ocean. Currently, many countries around the world are continuously researching and improving their oil extraction equipment to develop their economies. For onshore oil extraction equipment, both above-ground and downhole, a certain level of advanced technology has been achieved. However, for heavy oil field extraction, especially offshore heavy oil extraction, existing equipment such as rod pumps, electric submersible centrifugal pumps, and hydraulic pumps still face some technical challenges: such as low efficiency, susceptibility to sand jamming, short lifespan, complex and bulky surface supporting facilities, easy leakage of wellhead dynamic seals, and inability to be used in deviated or horizontal wells.
[0003] While the electric submersible screw pumps (ESPs) that have emerged in recent years have solved the aforementioned problems, they still have some shortcomings. During oil extraction, the crude oil drawn into ESPs inevitably contains some silt or other solid impurities. Due to the low output torque capacity of the ESP's motor and mechanical transmission, its output displacement is generally low, resulting in less fluid flow turbulence inside the pump. This makes it difficult to efficiently remove the silt or solid impurities drawn into the pump. If a large amount of silt or solid impurities remain inside the ESP, it will reduce the pump's oil suction and discharge efficiency and increase the wasted torque output of the drive motor, thereby increasing the risk of motor burnout and significantly reducing its service life. Therefore, improving the fluid flow turbulence inside ESPs is a pressing issue that the industry urgently needs to address. Summary of the Invention
[0004] The purpose of this invention is to provide a high-fluid-flow-disturbance solid-carrying screw pump oil production system, which can effectively improve the fluid flow disturbance inside the screw pump body, so that the mud or other solid impurities inside the pump body can be effectively discharged, thereby improving the oil production efficiency and service life of the screw pump.
[0005] To achieve the above objectives, the present invention provides a high-fluid-flow-disturbance solid-carrying mud-carrying screw pump oil production system, comprising a drive assembly located at the bottom, a screw pump connected to the top of the drive assembly, an inlet on the side of the screw pump near the drive assembly, a rotor and a stator bushing inside the screw pump, a return fluid channel on the outer side of the stator bushing, an external return fluid port on the side of the return fluid channel away from the drive assembly, and an internal return fluid port on the side of the return fluid channel near the drive assembly that communicates with the internal cavity of the stator bushing; an outlet pipe connected to the discharge end of the screw pump, the output end of the outlet pipe connected to an oil storage assembly on the ground, and a return fluid pipe connected to the external return fluid port on the oil storage assembly.
[0006] Preferably, the drive assembly includes a drive motor, the output end of which is connected to a reducer, and the output end of the reducer is connected to the rotor of the screw pump via a coupling.
[0007] Preferably, at least two internal return ports are provided and are distributed along the radial direction of the screw pump.
[0008] Preferably, a check valve is provided inside the internal return port.
[0009] Preferably, a one-way valve is connected between the discharge end of the screw pump and the outlet pipe.
[0010] Preferably, both the drive assembly and the outer wall of the screw pump are provided with elastic stabilizers, and the outer wall of the screw pump is also connected with an anchoring device.
[0011] Preferably, a return oil pump is installed on the return pipe.
[0012] Preferably, the oil storage assembly includes an oil-liquid separation chamber connected to the outlet pipe, and an oil temporary storage chamber is connected to one side of the oil-liquid separation chamber via an oil drain pipe; the return pipe is connected to one side of the bottom of the oil temporary storage chamber.
[0013] Preferably, the bottom of the oil-liquid separation chamber is provided with a drain outlet, and the oil drain pipe is provided with an oil drain valve.
[0014] Preferably, the bottom of the oil storage tank is provided with an oil drain port.
[0015] Therefore, the present invention employs the above-mentioned high fluid flow disturbance solid-carrying mud-carrying screw pump oil production system, which can effectively improve the fluid flow disturbance inside the screw pump body, so that mud or other solid impurities inside the pump body can be effectively discharged, greatly improving the oil production efficiency and service life of the screw pump.
[0016] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of an embodiment of a high-fluid-flow-disturbance solid-carrying and mud-carrying screw pump oil production system according to the present invention; Figure 2 This is a schematic diagram of the internal structure of a screw pump in an embodiment of a high-fluid-flow-disturbance solid-carrying and mud-carrying screw pump oil production system according to the present invention.
[0018] Figure Labels 1. Drive motor; 2. Reducer; 3. Coupling; 4. Screw pump; 41. Rotor; 42. Stator bushing; 43. Inlet; 44. Return channel; 45. External return port; 46. Internal return port; 47. Check valve; 5. Flexible centralizer; 6. Anchoring device; 7. Check valve; 8. Outlet pipe; 9. Oil-liquid separation chamber; 10. Drain outlet; 11. Oil drain pipe; 12. Oil drain pipe valve; 13. Oil temporary storage chamber; 14. Oil drain outlet; 15. Return pipe; 16. Return oil pump. Detailed Implementation
[0019] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments.
[0020] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.
[0021] Example 1 like Figure 1As shown, this invention provides a high-fluid-flow-disturbance solids-carrying mud-carrying screw pump oil production system, including a drive assembly located at the bottom. A screw pump 4 is connected to the top of the drive assembly, which provides power output for the normal operation of the screw pump 4. The drive assembly includes a drive motor 1, which is connected to an external power supply device (not shown in the figure) via a cable to supply power to the drive motor 1. Since these are all prior art, they will not be described in detail here. Elastic centralizers 5 are provided on the outer walls of both the drive assembly and the screw pump 4 to prevent the downhole equipment from shifting due to vibration during operation. An anchoring device 6 is also connected to the outer wall of the screw pump 4 to further position the screw pump 4 and ensure the stable operation of the downhole equipment.
[0022] The output end of the drive motor 1 is connected to the reducer 2, which can provide protection for the drive motor 1 and amplify the torque output. The output end of the reducer 2 is connected to the rotor 41 of the screw pump 4 through the coupling 3, and is used to drive the screw pump 4.
[0023] The screw pump 4 has an inlet 43 near the drive assembly for drawing oil from the well. Figure 2 As shown, the screw pump 4 is internally equipped with a rotor 41 and a stator bushing 42. Multiple sealed chambers are formed between the rotor 41 and the stator bushing 42. During the rotation of the rotor 41, the material in the sealed chamber is gradually lifted upward and eventually discharged, thus realizing the suction of oil by the screw pump 4.
[0024] like Figure 2 As shown, a return fluid channel 44 is provided on the outer side of the stator bushing 42, allowing the returned oil to re-enter the screw pump 4. An external return fluid port 45 is provided on the side of the return fluid channel 44 away from the drive assembly, for connection to the external return fluid pipe 15. An internal return fluid port 46 is provided on the side of the return fluid channel 44 near the drive assembly, communicating with the internal cavity of the stator bushing 42, for re-injecting the returned oil from the outside into the internal cavity of the stator bushing 42.
[0025] The internal return ports 46 are at least two in number and are distributed radially along the screw pump 4. This design ensures that regardless of the current position of the rotor 41, at least one internal return port 46 can always inject return oil into the internal sealed chamber. This secondary injection of external oil increases the flow disturbance within the sealed chamber, allowing for smoother removal of sediment and other solid impurities, preventing sludge buildup and facilitating the smooth operation of the screw pump 4. Furthermore, a check valve 47 is installed within the internal return ports 46 to prevent material from being forced into the return channel 44, thus preventing blockage of the return channel 44.
[0026] The discharge end of the screw pump 4 is connected to an outlet pipe 8, which is used to discharge the material inside the screw pump 4. A one-way valve 7 is connected between the discharge end of the screw pump 4 and the outlet pipe 8 to effectively prevent the material in the screw pump 4 and the outlet pipe 8 from flowing back. The output end of the outlet pipe 8 is connected to an oil storage assembly on the ground for collecting and separating the sucked-up material.
[0027] The oil storage assembly includes an oil-liquid separation chamber 9 connected to the outlet pipe 8, used to separate the oil drawn up by the screw pump 4 from silt or other solid impurities. A drain port 10 is provided at the bottom of the oil-liquid separation chamber 9 to discharge the separated silt or other solid impurities. The oil-liquid separation chamber 9 can employ either static sedimentation or centrifugal separation; no specific limitation is made here, as long as the purpose of separating the oil from solid impurities is achieved. Since existing technology is used, further details about the oil-liquid separation chamber 9 will not be elaborated upon here.
[0028] One side of the oil-liquid separation chamber 9 is connected to the oil temporary storage chamber 13 via an oil drain pipe 11. An oil drain pipe valve 12 is installed on the oil drain pipe 11, which can control the opening and closing of the oil drain pipe 11. When the oil-liquid separation operation is carried out in the oil-liquid separation chamber 9, the oil drain pipe valve 12 can be closed to prevent impurities in the oil-liquid separation chamber 9 from accidentally entering the oil temporary storage chamber 13.
[0029] The bottom of the oil storage tank 13 is equipped with an oil drain port 14 for discharging the separated oil. A return pipe 15 is connected to one side of the bottom of the oil storage tank 13, and the other end of the return pipe 15 is connected to the external return port 45 of the screw pump 4. This allows some of the oil in the oil storage tank 13 to flow back into the screw pump 4, thereby increasing the fluid flow disturbance inside the screw pump 4. A return oil pump 16 is installed on the return pipe 15 to increase the oil flow rate within the return pipe 15. During the operation of the screw pump 4, the return flow rate can be adjusted by changing the operating state of the return oil pump 16, thus adjusting the degree of fluid flow disturbance inside the screw pump 4. If the screw pump 4 sucks in a large amount of mud, sand, or other solid impurities during operation, the power output of the return oil pump 16 can be increased to further increase fluid flow disturbance and ensure that the impurities inside the screw pump 4 are flushed out. If the screw pump 4 sucks in less mud or other solid impurities during a certain period of operation, the power output of the return oil pump 16 can be reduced, thereby improving the overall working efficiency of the oil production system.
[0030] Therefore, the present invention employs the above-mentioned high fluid flow disturbance solid-carrying mud-carrying screw pump oil production system, which can effectively improve the fluid flow disturbance inside the screw pump body, so that mud or other solid impurities inside the pump body can be effectively discharged, greatly improving the oil production efficiency and service life of the screw pump.
[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.
Claims
1. A high-fluid-flow-disturbance solid-carrying mud-carrying screw pump oil production system, characterized in that: The device includes a drive assembly located at the bottom, a screw pump connected to the top of the drive assembly, an inlet on the side of the screw pump near the drive assembly, a rotor and a stator bushing inside the screw pump, a return channel on the outside of the stator bushing, an external return port on the side of the return channel away from the drive assembly, and an internal return port on the side of the return channel near the drive assembly that communicates with the internal chamber of the stator bushing; the discharge end of the screw pump is connected to an outlet pipe, the output end of the outlet pipe is connected to an oil storage assembly on the ground, and the oil storage assembly is provided with a return pipe that communicates with the external return port.
2. The high fluid flow disturbance solidified mud-carrying screw pump oil production system according to claim 1, characterized in that: The drive assembly includes a drive motor, the output end of which is connected to a reducer, and the output end of the reducer is connected to the rotor of the screw pump via a coupling.
3. The high fluid flow disturbance solidified mud-carrying screw pump oil production system according to claim 1, characterized in that: At least two internal return ports are provided and are distributed along the radial direction of the screw pump.
4. The high fluid flow disturbance solidified mud-carrying screw pump oil production system according to claim 1, characterized in that: A check valve is installed inside the internal return port.
5. The high fluid flow disturbance solidified mud-carrying screw pump oil production system according to claim 1, characterized in that: A one-way valve is connected between the discharge end of the screw pump and the outlet pipe.
6. The high fluid flow disturbance solidified mud-carrying screw pump oil production system according to claim 1, characterized in that: Both the drive assembly and the outer wall of the screw pump are equipped with elastic stabilizers, and the outer wall of the screw pump is also connected to an anchoring device.
7. The high fluid flow disturbance solidified mud-carrying screw pump oil production system according to claim 1, characterized in that: A return oil pump is installed on the return pipe.
8. The high fluid flow disturbance solidified mud-carrying screw pump oil production system according to claim 1, characterized in that: The oil storage assembly includes an oil-liquid separation chamber connected to the outlet pipe, and an oil temporary storage chamber is connected to one side of the oil-liquid separation chamber via an oil drain pipe; the return pipe is connected to one side of the bottom of the oil temporary storage chamber.
9. The high fluid flow disturbance solidified mud-carrying screw pump oil production system according to claim 8, characterized in that: The bottom of the oil-liquid separation chamber is provided with a drain outlet, and the oil drain pipe is provided with an oil drain valve.
10. A high-fluid-flow-disturbance solid-carrying mud-carrying screw pump oil production system according to claim 8, characterized in that: The bottom of the oil storage tank is equipped with an oil drain port.