Spiral groove lead screw driving type electric submersible pump for deepwater oil and gas exploitation
Through the spiral groove screw-driven submersible oil-electric pump, the problems of low equipment efficiency, serious wear and difficulty in maintenance in deep-sea oil and gas mining are solved, and efficient and reliable oil and gas transmission and energy consumption are achieved.
Patent Information
- Application Number
- CN202421884285.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-06
- Publication Date
- 2025-07-22
- Estimated Expiration
- 2034-08-06
AI Technical Summary
The existing centrifugal pumps and screw pumps have problems such as low efficiency, easy wear, easy corrosion, high maintenance costs, and inadequate to high viscosity and sand-containing fluids in deep-sea oil and gas mining. The existing submersible oil electric pump flow path is complex and consumes energy.
The spiral groove screw-driven submersible oil electric pump is adopted, which drives the plunger reciprocating motion through the rotation of the spiral groove screw. The design optimizes force transmission and energy loss. The oil and gas flow is controlled by a one-way valve, and the motor runs in one direction, reducing wear and faults, and the modular design is easy to maintain.
It realizes efficient and reliable oil and gas transportation, especially in high viscosity and high impurity environments, reducing energy consumption and maintenance costs, and improving the durability and reliability of equipment.
Smart Images
Figure CN223136361U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of deep - water oil and gas exploitation and boosting transportation, and particularly relates to a screw - groove lead - screw - driven submersible electric pump for deep - water oil and gas exploitation. Background Art
[0002] With the gradual depletion of on - land oil and gas resources, the ocean rich in oil and gas resources has become the most realistic energy replacement area, the focus of the world in the era of energy scarcity, and an inevitable requirement for ensuring national energy security. More than 3 million square kilometers of marine areas in China are rich in oil and gas resources. Deep - water oil and gas lifting and transportation are important links in the development and utilization of marine oil and gas. Traditional oil and gas transportation mainly relies on mechanical equipment such as centrifugal pumps and screw pumps. However, these devices have various limitations and disadvantages in marine environment applications. For example, the centrifugal pump has low efficiency when dealing with high - viscosity fluids, especially under low - flow conditions, the efficiency further decreases; when working in fluids containing sand or other solid particles, the impeller and pump body of the centrifugal pump are prone to wear; corrosive substances in the seawater environment can accelerate the corrosion of the pump, affecting the life and reliability of the pump; at the same time, the maintenance cost of the centrifugal pump is relatively high, especially in the seabed environment, the maintenance and replacement costs are even more expensive. On the other hand, the screw pump has reduced operating efficiency for extremely high - viscosity fluids and is prone to blockage; as the usage time increases, the volumetric efficiency of the screw pump will decrease due to wear; at the same time, the screw pump is more sensitive to solid particles and impurities and is prone to damage.
[0003] In view of the problems of high fluid viscosity, seawater corrosion, and fluid sand - containing in the process of sub - sea oil and gas exploitation, the lead - screw - driven submersible electric pump has become a key device for oil and gas lifting and transportation in deep - sea environments, which can effectively handle multiphase fluids, including high - viscosity, gas - liquid mixed - phase, and high - solid - impurity - containing crude oil. The lead - screw - driven submersible electric pump is usually designed to withstand high pressure and low - temperature environments on the seabed and has good corrosion resistance. Its structure includes a pump body, a motor, a reciprocating mechanism, a plunger, an oil suction port, and an oil discharge port. The motor drives the lead screw to rotate, causing the plunger in the pump body to reciprocate, thereby realizing the suction and discharge of oil and gas. The flow path of the existing submersible electric pump is often designed to be relatively winding, prone to blockage and wear, and consumes a large amount of energy, which is not conducive to the extraction of high - viscosity and high - impurity crude oil. Summary of the Utility Model
[0004] Based on the above - mentioned technical status quo, the utility model provides a screw - groove lead - screw - driven submersible electric pump for deep - water oil and gas exploitation, which drives the reciprocating motion of the plunger through the rotational motion of the screw - groove lead screw to realize oil and gas lifting and transportation, ensuring high - energy - efficiency and high - displacement transportation of multiphase fluids such as high - viscosity, gas - liquid mixed - phase, and high - solid - impurity - containing crude oil under high sand - content and various chemical environments.
[0005] The technical solution adopted by the present utility model is as follows: A screw pump for deep-water oil and gas production driven by a spiral groove lead screw, comprising an oil outlet, an oil discharge chamber, an oil and gas circulation chamber D drain valve, a spiral groove lead screw, an oil and gas circulation chamber E drain valve, a submersible pump housing, an upper working chamber, a plunger, an oil and gas circulation chamber D, an oil and gas circulation chamber E, a lower working chamber, an oil and gas circulation chamber D inlet valve, and an oil and gas circulation chamber E inlet valve. The oil discharge chamber is located at the top of the submersible pump and is connected to the oil outlet, and is used to collect the oil and gas from the oil and gas circulation chambers D and E and provide an oil discharge channel; the spiral groove lead screw is matched with the plunger, installed at the inner cylinder of the submersible pump, coaxial with the inner cylinder, and realizes reciprocating up and down movement under the drive of the spiral groove lead screw; the upper working chamber and the lower working chamber are respectively located above and below the spiral groove lead screw, and cooperate with the plunger to form a space for oil and gas inhalation and discharge; the oil and gas circulation chamber D drain valve, the oil and gas circulation chamber E drain valve, the oil and gas circulation chamber D inlet valve, and the oil and gas circulation chamber E inlet valve are respectively installed at the drain end and the inlet end of the submersible pump to control the discharge and entry of oil and gas.
[0006] Further, in the present utility model, the spiral groove lead screw rotates at a certain angular velocity under the drive of the motor, thereby driving the cooperating plunger to reciprocate up and down along the axis; when the plunger moves upward, the volume of the lower working chamber increases, and under the action of the pressure difference, the oil and gas circulation chamber E inlet valve opens, and the oil and gas continuously enter the working chamber, while the volume of the upper working chamber decreases, the internal oil and gas pressure increases, and is discharged through the oil and gas circulation chamber D drain valve; conversely, when the plunger moves downward, the volume of the upper working chamber increases, and under the action of the pressure difference, the oil and gas circulation chamber D inlet valve opens, and the oil and gas continuously enter the working chamber, while the volume of the lower working chamber decreases, the internal oil and gas pressure increases, and is discharged through the oil and gas circulation chamber E drain valve; with the periodic change of the volumes of the upper working chamber and the lower working chamber, finally, the oil and gas are inhaled from the inlet end, pressurized and discharged to the oil discharge chamber, completing the pressurization and transportation of the medium.
[0007] Further, in the present utility model, the oil and gas circulation chamber D inlet valve, the oil and gas circulation chamber D, the upper working chamber, and the oil and gas circulation chamber D drain valve together constitute the upper working chamber medium pressurization and transportation channel; the oil and gas circulation chamber E inlet valve, the oil and gas circulation chamber E, the lower working chamber, and the oil and gas circulation chamber E drain valve together constitute the lower working chamber medium pressurization and transportation channel; the oil and gas circulation chamber D inlet valve, the oil and gas circulation chamber D drain valve, the oil and gas circulation chamber E inlet valve, and the oil and gas circulation chamber E drain valve control the entry and exit of the oil and gas in the channel through the pressure difference.
[0008] Further, in the present utility model, the spiral groove lead screw has a positive and negative spiral groove design for driving the reciprocating up and down movement of the piston. The design of the spiral groove optimizes the force transmission and conversion efficiency, reduces the energy loss, and the drive motor only needs to rotate in one direction, avoiding the long-term repeated forward and reverse switching of the motor and reducing the failure rate.
[0009] Furthermore, the upper end of the spiral groove lead screw of the present utility model is rotationally supported by the upper working chamber end cover, and the lower end is rotationally supported by the bottom sealing plate of the submersible electric pump housing. Sealed bearing structures are provided at the support points of the upper and lower parts to reduce friction and wear during the rotation of the lead screw.
[0010] Furthermore, the inlet valve of the oil-gas circulation chamber D, the outlet valve of the oil-gas circulation chamber D, the inlet valve of the oil-gas circulation chamber E, and the outlet valve of the oil-gas circulation chamber E in the present utility model are all high-precision one-way valves, which work synchronously with the drive of the spiral groove lead screw to achieve precise control of oil and gas.
[0011] Furthermore, the submersible electric pump described in this article adopts modular components, and the designs of the ball valve, spiral groove lead screw, plunger, etc. allow for quick disassembly and replacement, reducing maintenance time and costs.
[0012] The present utility model has the following advantages compared with the prior art:
[0013] 1) For the spiral groove lead screw-driven submersible electric pump proposed in the present utility model, the positive and negative spiral groove designs provide precise oil and gas control capabilities. By precisely regulating the rotational speed of the lead screw, the reciprocating motion speed of the piston can be controlled, and thus the suction and discharge of oil and gas can be precisely controlled, achieving precise control of the oil and gas flow. The motor rotates in one direction to drive the plunger to complete the reciprocating motion up and down, avoiding frequent switching between forward and reverse rotations;
[0014] 2) For the spiral groove lead screw-driven submersible electric pump proposed in the present utility model, the design reduces the direct contact between moving parts, thereby reducing wear and failure rates. In addition, the geometric shape of the spiral groove lead screw helps to evenly distribute the load and reduce local stress concentration, making the electric pump more reliable and durable during long-term operation;
[0015] 3) For the spiral groove lead screw-driven submersible electric pump proposed in the present utility model, the designs of the spiral groove lead screw and the piston allow for quick disassembly and replacement, reducing maintenance time and costs. The simplified design also reduces potential failure points and improves the reliability of the entire system;
[0016] 4) For the spiral groove lead screw-driven submersible electric pump proposed in the present utility model, the positive and negative spiral grooves can provide continuous and stable force output. The electric pump of the present utility model can achieve more stable and efficient oil and gas transportation, especially when transporting multiphase fluids such as high-viscosity, gas-liquid mixed, and high-solid-impurity-containing crude oil, showing higher transportation capacity;
[0017] 5) For the spiral groove lead screw-driven submersible electric pump proposed in the present utility model, the oil and gas flow path and valve layout are optimized, reducing energy consumption. The efficient drive mode of the spiral groove lead screw reduces the energy demand, contributing to more green and sustainable oil and gas extraction operations. Description of the Drawings
[0018] The present utility model will be further described below in conjunction with the accompanying drawings:
[0019] Figure 1 It is a schematic structural diagram of a submersible electric pump driven by a spiral groove lead screw according to the present utility model;
[0020] Figure 2 is Figure 1 a sectional view taken along line A-A of the submersible electric pump driven by a spiral groove lead screw in
[0021] Figure 3 a three-dimensional model of the cylinder configuration of the submersible electric pump driven by a spiral groove lead screw according to the present utility model.
[0022] Reference numerals in the figure: 1 - oil outlet; 2 - oil discharge chamber; 3 - oil-gas circulation chamber D drain valve; 4 - spiral groove lead screw; 5 - oil-gas circulation chamber E drain valve; 6 - submersible electric pump housing; 7 - upper working chamber; 8 - plunger; 9 - oil-gas circulation chamber D; 10 - oil-gas circulation chamber E; 11 - lower working chamber; 12 - oil-gas circulation chamber D inlet valve; 13 - oil-gas circulation chamber E inlet valve. Specific embodiments
[0023] The present utility model will be further described in detail below in conjunction with the accompanying drawing examples:
[0024] Figure 1The utility model is a schematic diagram of the structure of a spiral groove screw driven submersible electric pump, a spiral groove screw driven submersible electric pump for deepwater oil and gas exploitation, used for lifting and transporting oil and gas in complex deep-sea environments, and mainly includes an oil outlet 1, an oil discharge chamber 2, an oil and gas circulation chamber D drain valve 3, a spiral groove screw 4, an oil and gas circulation chamber E drain valve 5, a submersible electric pump housing 6, an upper working chamber 7, a plunger 8, an oil and gas circulation chamber D9, an oil and gas circulation chamber E10, a lower working chamber 11, an oil and gas circulation chamber D inlet valve 12 and an oil and gas circulation chamber E inlet valve 13. The oil outlet 1 is used to transport the processed oil and gas to the ground or other processing equipment. The oil discharge chamber 2 is connected to the oil outlet 1, and is used to preliminarily collect the oil and gas from the oil and gas circulation chamber D9 and the oil and gas circulation chamber E10. The oil and gas circulation chamber D drain valve 3 and the oil and gas circulation chamber E drain valve 5 are respectively installed near the upper end of the interlayer channel, and are one-way valves to control the discharge of oil and gas. The housing 6 of the spiral groove screw driven submersible electric pump constitutes the main structure of the electric pump and provides space for installing and protecting internal components. The bottom of the spiral groove screw 4 is connected to the motor and has a forward and reverse spiral groove design, which is used to drive the up and down reciprocating motion of the plunger 8. The plunger 8 can only move up and down, and it cooperates with the inner wall of the upper and lower working chambers through keyways and other shapes, or the cross-section of the plunger 8 and the upper and lower working chambers is designed to be non-circular, thereby limiting the circumferential rotation of the plunger 8 in the upper and lower working chambers. The upper working chamber 7 is located above the spiral groove screw 4 and cooperates with the plunger 8 to form a space for oil and gas suction and discharge. The plunger 8 cooperates with the spiral groove screw 4 to achieve the suction and discharge of oil and gas. The oil and gas circulation chamber D9 and the oil and gas circulation chamber E10 are respectively connected to the upper working chamber 7 and the lower working chamber 11 for the transportation of oil and gas. The lower working chamber 11 is located below the spiral groove screw 4 and cooperates with the plunger 8 to form a space for oil and gas suction and discharge. The oil and gas circulation chamber D liquid inlet valve 12 and the oil and gas circulation chamber E liquid inlet valve 13 are respectively installed at the lower end of the interlayer channel, and are one-way valves to control the entry of oil and gas.
[0025] Figure 2 for Figure 1 The cross-sectional view at AA of the medium spiral groove screw driven submersible electric pump shows that the oil and gas circulation chamber D9 and the oil and gas circulation chamber E10 are respectively connected to the upper working chamber 7 and the lower working chamber 11, and are distributed in a jacket shape with the upper working chamber 7 and the lower working chamber 11, separated by two symmetrical rib plates in the middle for the transportation of oil and gas. Figure 3 This is a three-dimensional model of the cylinder body of the spiral groove screw driven submersible electric pump of the utility model. Figure 2 and Figure 3, during the operation of the submersible electric pump driven by a spiral groove screw rod, under the control of the control system, the spiral groove screw rod 4 rotates at a certain angular velocity driven by the motor, and this rotation drives the matching plunger 8 to reciprocate up and down along the axis. During this movement process, the volumes of the upper working chamber 7 and the lower working chamber 11 change periodically. When the plunger 8 moves upward, the volume of the lower working chamber 11 increases. At this time, due to the pressure difference, the inlet valve 13 of the oil-gas circulation chamber E opens, allowing the oil-gas to continuously flow into the lower working chamber 11 through the oil-gas circulation chamber E10. At the same time, the volume of the upper working chamber 7 decreases, resulting in an increase in the oil-gas pressure therein, and the oil-gas flows out of the upper working chamber 7 and is discharged from the drain valve 3 of the oil-gas circulation chamber D through the oil-gas circulation chamber D9. On the contrary, when the plunger 8 moves downward, the volume of the upper working chamber 7 increases, and similarly due to the pressure difference, the inlet valve 12 of the oil-gas circulation chamber D opens to allow the oil-gas to flow in. At this time, the volume of the lower working chamber 11 decreases, and the oil-gas pressure inside it increases and is discharged through the drain valve 5 of the oil-gas circulation chamber E. This periodic change in the volumes of the upper working chamber 7 and the lower working chamber 11 realizes the processes of oil-gas suction, pressurization, and discharge. The oil-gas is sucked in through the inlet end, pressurized, and discharged from the drain end, thus completing the functions of pressurizing and transporting the medium. In this way, the system effectively controls the flow of the oil-gas, ensuring the stable operation and high efficiency of the hydraulic system.
[0026] Although the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, it is not a limitation to the protection scope of the present invention. Those skilled in the art should understand that based on the technical solutions of the present invention, various modifications or deformations that can be made without creative efforts by those skilled in the art are still within the protection scope of the present invention.
Claims
1. A screw drive submersible electric pump for deep - water oil and gas production, characterized in that, It includes an oil outlet (1), an oil drainage cavity (2), an oil-gas circulation cavity D liquid drainage valve (3), a spiral groove lead screw (4), an oil-gas circulation cavity E liquid drainage valve (5), a submersible electric pump housing (6), an upper working cavity (7), a plunger (8), an oil-gas circulation cavity D (9), an oil-gas circulation cavity E (10), a lower working cavity (11), an oil-gas circulation cavity D liquid inlet valve (12), and an oil-gas circulation cavity E liquid inlet valve (13); The upper end of the submersible electric pump housing (6) forms an oil outlet (1), and a sealing plate is arranged at the lower end. An inner cylinder is coaxially and nestedly arranged inside the submersible electric pump housing (6). The upper end of the inner cylinder is fixedly connected to the top cover of the submersible electric pump housing (6), and the lower end is fixedly connected to the sealing plate. The sandwich space between the submersible electric pump housing (6) and the inner cylinder is divided into an oil-gas circulation cavity D (9) and an oil-gas circulation cavity E (10) which are distributed left and right in a jacket shape by rib plates; The spiral groove lead screw (4) penetrates through the sealing plate and extends into the inner cylinder. An end cover is formed at a position on the inner wall surface of the inner cylinder slightly above. The upper end of the spiral groove lead screw (4) integrally forms a cover plate. The outer peripheral side of the cover plate is rotatably positioned and installed with the inner peripheral surface of the end cover. An oil drainage cavity (2) is formed above the cover plate, and the oil drainage cavity (2) is communicated with the oil outlet (1); A spiral groove is opened on the lead screw surface of the spiral groove lead screw (4). The plunger (8) is fitted and installed on the spiral groove lead screw (4), and the circumferential rotation of the plunger (8) is restricted and it can only be driven to move up and down reciprocally; An upper working cavity (7) is formed between the plunger (8) and the cover plate, a lower working cavity (11) is formed between the plunger (8) and the sealing plate. The upper working cavity (7) is communicated with the oil-gas circulation cavity D (9), and the lower working cavity (11) is communicated with the oil-gas circulation cavity E (10); An oil-gas circulation cavity D liquid drainage valve (3) for controlling the on-off between the upper end of the oil-gas circulation cavity D (9) and the oil drainage cavity (2) is arranged at the upper end of the oil-gas circulation cavity D (9), and an oil-gas circulation cavity D liquid inlet valve (12) for controlling the on-off between the lower end of the oil-gas circulation cavity D (9) and the outside of the submersible electric pump housing (6) is arranged at the lower end of the oil-gas circulation cavity D (9); An oil-gas circulation cavity E liquid drainage valve (5) for controlling the on-off between the upper end of the oil-gas circulation cavity E (10) and the oil drainage cavity (2) is arranged at the upper end of the oil-gas circulation cavity E (10), and an oil-gas circulation cavity E liquid inlet valve (13) for controlling the on-off between the lower end of the oil-gas circulation cavity E (10) and the outside of the submersible electric pump housing (6) is arranged at the lower end of the oil-gas circulation cavity E (10).
2. The submersible electric pump according to claim 1, wherein The spiral groove on the spiral groove lead screw (4) is a positive and negative spiral groove, and the axial length of the positive and negative spiral groove is consistent with the up and down movement stroke of the plunger (8).
3. The submersible electric pump according to claim 1, wherein, A sealing bearing is arranged between the cover plate of the spiral groove lead screw (4) and the end cover on the inner wall of the inner cylinder, and a sealing bearing is arranged between the spiral groove lead screw (4) and the sealing plate.
4. The submersible electric pump according to claim 1, wherein The oil-gas circulation cavity D liquid drainage valve (3), the oil-gas circulation cavity E liquid drainage valve (5), the oil-gas circulation cavity D liquid inlet valve (12), and the oil-gas circulation cavity E liquid inlet valve (13) are all one-way valves.
5. The submersible electric pump according to claim 1, wherein The oil-gas circulation cavity D liquid drainage valve (3), the oil-gas circulation cavity E liquid drainage valve (5), the oil-gas circulation cavity D liquid inlet valve (12), and the oil-gas circulation cavity E liquid inlet valve (13) are all one-way ball valves.