RU202900U1 - Stage submersible multistage centrifugal pump - Google Patents

Abstract

The stage of a submersible multistage centrifugal pump belongs to the hydraulic engineering industry and can be used in the oil industry to create submersible centrifugal pumps designed for oil production from wells with low flow rates. The technical result consists in increasing the efficiency. The technical result is achieved due to the fact that the stage of a submersible multistage centrifugal pump contains a closed centrifugal impeller, which includes a driving and driven disks with blades placed between them, and a guide apparatus including a cage, a lower and an upper disks, between which two blades are located, forming flow-through channels with a height in the range of 3.5-6.5 mm, the impeller blades are made with an angle of coverage of the midline of 120-150 °, and the blades of the guide vane are made with an angle of coverage of 180-230 °, the coefficient of constriction of the blade at the outlet of the guide vane is 0 , 7, the ratio of the diameters of the upper and lower disks of the impeller wheel is 1.05-1.07. 4 ill.

Description

The utility model relates to hydraulic engineering and can be used in the oil industry to create submersible centrifugal pumps designed for oil production from wells with low flow rates.

There is a known stage of a submersible multistage centrifugal pump containing a closed centrifugal impeller, including a driving and driven disks with blades placed between them, and a guide apparatus including a cage, lower and upper disks, between which the blades are located, forming channels of the flow path (RF patent No. 2161737, IPC F04D 1/06, F04D 13/10, publ. 10.01.2001).

The disadvantage of this technical solution is the impossibility of pump operation in wells with a wide range of mechanical impurities in the formation fluid.

The closest to the proposed technical solution is the stage of a submersible multistage centrifugal pump, containing a closed centrifugal impeller, including a driving and driven disks with blades placed between them, and a guide apparatus, including a cage, lower and upper disks, between which two blades are located, forming flow-through channels with a height in the range of 3.5-6.5 mm, the impeller blades are made with an angle of coverage of the midline of 120-150 °, and the blades of the guide vane are made with an angle of coverage of 180-230 °, the coefficient of constriction of the blade at the outlet of the guide vane is 0 , 7. (RF patent for utility model No. 141221, Mcl. F04D 13/10, publ. 05/27/2014).

The disadvantage of this technical solution is its low efficiency.

The technical problem solved by the proposal is to increase the efficiency of a stage of a submersible multistage centrifugal pump.

To solve this technical problem, a stage of a submersible multistage centrifugal pump is proposed, containing a closed centrifugal impeller, including a driving and driven discs with blades placed between them, and a guide apparatus, including a cage, a lower and upper discs, between which two blades are located, forming flow channels , with a height in the range of 3.5-6.5 mm, the impeller blades are made with an angle of coverage of the midline of 120-150 °, and the blades of the guide vane are made with an angle of coverage of 180-230 °, the coefficient of constriction of the blade at the outlet of the guide vane is 0, 7, the ratio of the diameters of the upper and lower disks of the impeller wheel is 1.05 - 1.07.

It has been experimentally established that the more open (protruding) parts of the impeller wheel blades create additional vortex flows, which are the cause of an increase in the pressure created by the working stage and, as a consequence, an increase in efficiency. The dependence of the efficiency on the ratio of the diameters of the upper and lower disks of the impeller wheel is shown in the table

The applicant did not find other technical solutions for a similar purpose with a similar set of essential features during a search in scientific and technical literature and patent documentation. The proposed stage of a submersible multistage centrifugal pump can be made from known materials using known equipment and used in the oil industry to create submersible centrifugal pumps for oil production from wells with low flow rates. Therefore, the applicant considers that the proposal for this application meets the criteria for patentability of a utility model "novelty" and "industrial applicability".

The essence of the utility model is explained further on the basis of the presented drawings, where

- in Fig. 1 shows a stage of a submersible multistage centrifugal pump, section;

- in Fig. 2 shows the impeller, section;

- in Fig. 3 shows a guide vane, section.

- in Fig. 4 - upper and lower discs of the guide vanes.

The figures indicate

1. - impeller;

2. - guiding device;

3. - the driving disk of the wheel;

4. - driven disc of the wheel;

5. - the upper disc of the guide vane;

6. - the lower disc of the guide vane;

7. - bladeless cavity;

8. - bladeless cavity;

9. - impeller blades;

10. - hub;

11. - blades of the guide vane;

12. - annular ledge;

13. - ledge;

14. - clip;

15. - flow channel of the impeller;

16. - bladeless space.

D 1. - diameter of the upper disc of the impeller wheel;

D2. - diameter of the lower disc of the impeller wheel.

The table indicates

H (a) - head, m;

Р ² (kV) - power consumption, kW;

η _p (%) - coefficient of performance (efficiency),%;

Q (m ³ / d) - productivity, m ³ / day.

During the operation of the stage, the formation fluid flows through the flow channels 15 of the impeller 1 (Fig. 2), driven by the pump shaft, while the fluid pressure is formed due to centrifugal forces and due to the action of the impeller blades on the fluid flow. Further, the liquid after the impeller enters the vaneless space 16 (Fig. 1) and then into the flow channels of the guide vane 2, in which the kinetic energy of the flow is converted into potential energy, the pressure rises and the flow is rotated to an approximately radial direction to supply the next steps. Together with the reservoir fluid, mechanical impurities, salts move along the flow channels of the stage, which settle on the walls of the channels, especially in areas with minimum velocities, separation zones, reducing the cross-section of the channels.

The efficiency of a stage of a submersible multistage centrifugal pump, made in accordance with the proposal, increased to 35%, compared with 29-30% of the efficiency of a product made according to the RF patent for utility model No. 141221-prototype, in which the ratio of the diameters of the upper and lower disks of the impeller wheel is 0.93.

The applicant has manufactured and successfully tested prototypes of the proposed device.

Claims (1)

A stage of a submersible multistage centrifugal pump, containing a closed centrifugal impeller, including a driving and driven discs with blades placed between them, and a guide vane including a cage, lower and upper discs, between which two blades are located, forming flow channels, with a height in the range 3, 5-6.5 mm, the impeller blades are made with an angle of coverage of the centerline of 120-150 °, and the blades of the guide vane are made with an angle of coverage of 180-230 °, the coefficient of constriction of the blade at the outlet of the guide vane is 0.7, characterized in that the ratio of the diameters of the upper and lower disks of the impeller wheel is 1.05-1.07.

Images