RU117538U1 - THIN FILTERING SUBMERSIBLE CENTRIFUGAL PUMP INPUT MODULE - Google Patents

Abstract

1. Input module for fine filtration of a submersible centrifugal pump, designed for installation at the inlet of submersible centrifugal electric pumps for oil production and containing a housing with holes for the passage of formation fluid, a base and a head, a shaft located in the housing that transfers rotation to the pump from an electric motor, an intermediate bearing and an upper bearing with carbide bushings mounted on support bushings located in the upper and middle parts of the shaft, installed between the housing and the shaft, upper and lower perforated spacer tubes, between which an intermediate bearing is located, while the upper perforated spacer tube is located between the intermediate bearing and an upper bearing with carbide bushings, a multi-section slotted wire frame filter is fixed on the module housing, upper and lower limiters of the axial travel of the shaft made of antifriction material are mounted on the shaft, ensuring guaranteed linear travel shaft for free transmission of axial force from the pump shaft to the shaft of the hydraulic protection of the submersible electric motor, characterized in that it is equipped with upper and lower protective covers installed between the shaft and the upper and lower perforated spacer tubes so that the upper protective cover is limited from above by the bearing by the upper and lower bearing intermediate, and the lower protective casing is bounded from above by an intermediate bearing and from below by a base, blocking by their location the access of liquid to the shaft, shaft support bushings, intermediate bearing sleeve and additional bearing support sleeve, g

Description

1. The technical field

A utility model - the input module for fine filtration of a submersible centrifugal pump - relates to petroleum engineering, is intended for use in submersible pumps for oil production from oil wells and is used for fine cleaning of reservoir fluid at the inlet of a submersible centrifugal pump from large and small mechanical impurities (from fractions more than 0.2 mm), as well as transmitting torque from the shaft of the submersible motor to the shaft of the centrifugal pump and transmitting the axial load from the pump shaft to the shaft of the hydraulic motor protection unit gatel.

2. The level of technology

Known block filter for a submersible centrifugal electric pump containing a base, a head and a filter unit mounted between them, which consists of one or more filter sections with the possibility of replacement. Cases of individual blocks are connected using fasteners, and shafts using splined couplings. The filter element can be made of wire, spring, screen, etc. The filter capacity is the greater the greater the number of units mounted in it (RF patent for invention No. 2395014, published on July 20, 2010). This design of the input filtration module of a submersible centrifugal pump has limited throughput and low reliability due to the presence of a large number of structural elements of the heads, bases, nipples of individual blocks, that is, it has a more complex and heavy construction, a large mass of parts (splined couplings) rotating with the shaft.

Known input fine filter module designed for installation at the inlet of submersible centrifugal electric pumps for oil production and containing a housing with holes for the passage of formation fluid, a base and a head attached to the housing, a shaft transmitting rotation from the electric motor to the pump, a multi-section slotted wire-frame filter mounted on the housing, a dispersing device in the form of a screw, integrated in the housing of the input module, characterized in that it is equipped with a safety valve with a spring vodom which opens when clogged filter elements, and the hub of the screw dispersant is elongated and serves simultaneously as shaft protection sleeve (RF patent for utility model №109512, published 20.10.2011). This module does not reduce vibration in the lower zone and protects the shaft and its bushings from erosion.

Known input module of a submersible centrifugal pump designed for installation at the inlet of submersible centrifugal electric pumps for oil production and containing a housing with holes for the passage of formation fluid, a base and a head located in the housing, a shaft transmitting rotation to the pump from the electric motor, bearing bearings mounted on bearings bushings located in the upper and middle parts of the shaft, the upper and lower perforated spacer pipes installed between the housing and the shaft, between which is located bearing housing of the bearing support mounted on the support sleeve in the middle part of the shaft, while the upper perforated spacer tube is located between the bearing housings of the bearing supports mounted on the said support bushes, and a multi-section slotted wire-frame filter is fixed on the module case (utility model patent No. 97778 published on 09/20/2010). The filter is self-cleaning; there is a dispersing device made in the form of a screw rotating in a housing with longitudinal ribs.

The closest analogue is the input module of a submersible centrifugal pump (utility model patent No. 97778, published on September 20, 2010). However, it has the following disadvantages:

- increased wear of the shafts, as well as the support sleeves due to the influence of the flow of formation fluid;

- increased vibration of the shaft, in particular the lower end of the shaft due to its large extension.

The utility model claimed for registration of the input module for fine filtration of a submersible centrifugal pump will allow:

- reduce wear of the shaft and the support sleeves during operation;

- reduce vibration of the shaft.

To achieve this technical result, the input module of fine filtration of a submersible centrifugal pump, designed for installation at the inlet of submersible centrifugal electric pumps for oil production and containing a housing with holes for the passage of formation fluid, a base and a head located in the housing, a shaft transmitting rotation to the pump from the electric motor , intermediate bearing and upper bearing with carbide bushings mounted on support bushings located in the upper and middle parts of the shaft, the upper and lower perforated spacer tubes between the housing and the shaft, between which the intermediate bearing is located, while the upper perforated spacer tube is located between the intermediate bearing and the upper bearing with carbide bushings, a multi-section slotted wire-frame filter is fixed on the module housing, on the shaft mounted upper and lower axial shaft limiters made of antifriction material, ensuring a guaranteed linear shaft movement for free gears axial force from the pump shaft to the hydroprotection shaft of the submersible motor, according to a utility model, is equipped with upper and lower protective covers installed between the shaft and the upper and lower perforated spacer tubes so that the upper protective casing is bounded above by the upper and lower bearings by an intermediate bearing, and the lower protective casing limited from above by the bearing to the intermediate and from below by the base, which block their location of fluid access to the shaft, supporting sleeves of the shaft, the sleeve of the intermediate bearing and additional bearing support sleeve, sealing them and helping to reduce their wear during operation from exposure to aggressive formation fluid.

In addition, in the input module of the centrifugal pump, an additional bearing support sleeve mounted on the base of the additional support sleeve of the shaft can be provided, thereby reducing the radial play of the shaft, increasing its rigidity, which leads to a decrease in the level of vibration during rotation of the shaft.

3. Disclosure of utility model

The proposed design of the input module for fine filtration of a submersible centrifugal pump is installed at the inlet of a submersible centrifugal electric pump for oil production, contains a housing with holes for the passage of formation fluid, a base and a head located in the housing, a shaft transmitting rotation from the electric motor to the pump, the intermediate bearing and the upper bearing with carbide bushings mounted on supporting bushings located in the upper and middle parts of the shaft, mounted between the housing and the shaft in upper and lower perforated spacer tubes between which the intermediate bearing is located, while the upper perforated spacer tube is located between the upper and intermediate bearings, and the lower perforated spacer tube is located between the intermediate bearing and the base, a multi-section slotted wire-frame filter is fixed on the module case; the upper and lower limiters of the axial shaft stroke of antifriction material are mounted on the shaft, providing a guaranteed linear shaft stroke for the free transmission of axial force from the pump shaft to the hydraulic protection shaft of the submersible motor;

The inventive input module for fine filtration of a submersible centrifugal pump is equipped with upper and lower protective casings installed between the shaft and the upper and lower perforated spacer tube so that the upper protective casing is bounded above by the upper and lower bearings by the intermediate, and the lower protective casing is bounded by the intermediate and lower bearings from above the base, blocking its location, the fluid access to the shaft, the supporting sleeves of the shaft, the sleeve of the intermediate bearing and the additional bearing supporting sleeve, sealing them and helping to reduce them to wear during operation of the exposure in the formation fluid;

The inventive fine filtration input module also contains an additional bearing support sleeve mounted at the base on an additional shaft support sleeve, thereby reducing the radial play of the shaft, increasing its rigidity, which leads to a decrease in vibration during rotation of the shaft.

4. Brief Description of the Drawings

The drawing shows the input module of fine filtration of a submersible centrifugal pump.

The module consists of the housing of module 1 made of a high-strength pipe with holes along the entire length for the passage of formation fluid, head 3, base 2, shaft 4 with supporting sleeves of the shaft 7 located on it and connected to it by dowels and an additional supporting sleeve of the shaft 14 of hard alloy .

On the housing of module 1, a multi-section slotted wire-frame filter 8 is installed, consisting of filter elements welded from stainless steel wire-frame type and the joints of the outer rings 18, 19, 20 sealing them.

An intermediate bearing 5 is located in the housing of module 1, which is pulled together by the upper 9 and lower 10 spacer tubes. The upper 17 and lower 15 axial shaft limiters of the shaft made of antifriction material are mounted on the shaft 4, providing a guaranteed linear stroke of the shaft 4 for the free transfer of axial force from the pump shaft to the hydraulic protection shaft of the submersible motor. At the base 2 is an additional supporting sleeve of the shaft 14. The bearing bushings 6, the sleeve of the additional bearing support 13, the supporting sleeve of the shaft 7 located in the upper and middle parts of the shaft and the additional supporting sleeve of the shaft 14 are made of hard alloy.

The input module includes the following nodes.

1 - module housing;

2 - base;

3 - head;

4 - shaft;

5 - intermediate bearing;

6 - the sleeve of the intermediate bearing;

7 - shaft support sleeves located in the upper and middle parts of the shaft;

8 - multi-section slotted wire-frame filter;

9 - upper perforated spacer pipe;

10 - lower perforated spacer pipe;

11 - lower protective casing;

12 - upper protective casing;

13 - additional bearing support sleeve;

14 - additional supporting sleeve of the shaft;

15 - lower shaft travel limiter;

16 - upper bearing;

17 - the upper limiter of the shaft;

18 - outer outer ring;

19 - upper outer ring;

20 - lower outer ring.

5. Implementation of a utility model

The input module is used as part of submersible electric pump installations for oil production. Input modules are mounted on the inlet flange of the pump. Input modules transmit torque from the motor shaft to the pump shaft, transmit axial force from the pump shaft to the shaft of the hydraulic motor protection unit, clean and supply formation fluid to the inlet of the submersible pump.

When the submersible pump is turned on, the formation fluid absorbed by the pump rotor passes through the multi-section slotted wire frame filter 8 of the input module and through the holes in the housing 1 and in the upper and tender perforated spacer tubes into the internal cavity of the input module and then to the pump inlet. Mechanical particles suspended in the reservoir fluid, larger than the slit size of the multi-section slotted wire-frame filter 8, are separated and deposited in the cavity of the column. Shaft 4 transmits torque from the motor shaft to the pump shaft. Shaft 4 rotates in bearings 5 and 16 with bushings 6 and 13 of hard alloy.

The shaft 4, the shaft sleeve 7, the additional shaft support sleeve 14, the intermediate bearing sleeve 6 and the additional bearing support sleeve 13 are protected from erosion from the action of aggressive formation fluid by the upper 12 and lower 11 protective covers.

The shaft 4 of the input module for fine filtration of a submersible centrifugal pump transmits torque from the motor shaft to the pump shaft, has a key for fixing the shaft bushings, and splined ends for fastening the couplings. To reduce vibration of the shaft 4, an additional bearing support sleeve 13 is provided in the base 2 of the module.

The upper 17 and lower 15 axial shaft limiters of the shaft made of antifriction material are mounted on the shaft 4, providing a guaranteed linear stroke of the shaft 4 for the free transfer of axial force from the pump shaft to the hydraulic protection shaft of the submersible motor and fix the shaft inside the housing during transportation of the input module and during installation of the input module in the well as part of a submersible pump installation.

The input module can be reused after regeneration (purification of filter elements, restoration of breakthroughs, delaminations). Partial self-cleaning of the surface of the filtering elements occurs during operation due to the special wire profile, sharp edges of the receiving channels and grinding of all planes of the wire profile in contact with the formation fluid passing through the filter.

All parts of the module must be made of materials with increased corrosion resistance, for example, stainless steel.

Claims (2)

1. The input module of fine filtration of a submersible centrifugal pump, designed for installation at the inlet of submersible centrifugal electric pumps for oil production and comprising a housing with holes for the passage of formation fluid, a base and a head located in the housing, a shaft transmitting rotation to the pump from the electric motor, an intermediate bearing and upper bearing with carbide bushings mounted on supporting bushings located in the upper and middle parts of the shaft, mounted between the housing and the shaft, upper and lower perforated spacer tubes between which the intermediate bearing is located, while the upper perforated spacer tube is located between the intermediate bearing and the upper bearing with carbide bushings, a multi-section slotted wire-frame filter is fixed on the module housing, the upper and lower axial travel stops are mounted on the shaft a shaft made of antifriction material, providing a guaranteed linear stroke of the shaft for the free transfer of axial force from the pump shaft to the hydraulic shaft s of the submersible motor, characterized in that it is equipped with upper and lower protective casings mounted between the shaft and the upper and lower perforated spacer tubes so that the upper protective casing is bounded from above by the upper and lower bearings from the intermediate, and the lower protective casing is bounded from above by the intermediate and bottom base, blocking its location, the fluid access to the shaft, the supporting sleeves of the shaft, the sleeve of the intermediate bearing and the additional bearing support sleeve, g rmetiziruya them and helping to reduce their wear during operation of the exposure in the reservoir fluid. 2. The input module of the centrifugal pump according to claim 1, characterized in that it provides an additional bearing support sleeve mounted at the base on an additional support shaft sleeve, whereby the radial clearance of the shaft is reduced, its rigidity is increased, which leads to a decrease in vibration level shaft rotation.