RU152084U1 - ELECTRIC CENTRIFUGAL PUMP INSTALLATION VALVE - Google Patents

Abstract

The check valve of the installation of an electric centrifugal pump, comprising a seat, a valve shut-off plate and a safety sleeve, characterized in that the valve is installed in the lower part of the upper module of the pump section with the possibility of manufacturing in two versions: with a metal seat or with a rubber seat in the pump housing, moreover, the protective sleeve of the shaft is mounted on the shaft with the upper end end-to-end with the support sleeve, while the protective sleeve of the shaft is locked with a retaining ring in the lower part.

Description

The utility model relates to the oil industry and can be used in installations of electric centrifugal pumps (ESP), designed for pumping formation fluid from oil wells and forced fluid withdrawal. The ESP unit can be used to extract liquids containing gas, sand and corrosive elements.

Prerequisites for creating a utility model.

Analysis of the current level of technology in this field showed the following.

The ESP installation consists of a submersible pump unit, cable assembly, ground-based electrical equipment - a transformer complex substation. The pump unit consists of a submersible centrifugal pump and an engine with hydroprotection and descends into the well on a string of tubing.

Downhole installation equipment includes:

1. Submersible electric motor (SEM);

2. Engine hydraulic protection units - compensator and tread;

3. The electric submersible centrifugal pump of modular design (ETSNM);

4. Valve assemblies - return and drain.

The pump unit (PED with hydraulic protection units, ESPs and valve units) is lowered into the well on the tubing string, through the central channel of which the formation pumped by the pump then rises to the surface.

The peculiarity of starting centrifugal pumps is that the pump should start at zero flow, i.e. with a closed valve. To facilitate starting the submersible electric pump and prevent reverse rotation of the pump rotor (turbine mode) under the influence of a liquid column in the pipe string when the pump stops, a check valve is included in the design.

The check valve assemblies are designed for delivery up to 2000 m ³ / day, are structurally identical and have threads and couplings for tubing pipes with a diameter of 73 mm, 89 mm.

Valve assemblies of various designs are used: ball, poppet or other design, which are given below.

Known check valve (ball), which consists of a housing, on one side of which there is an internal tapered thread for connecting the drain valve, and on the other hand, an external tapered thread for screwing into the head of the fishing upper section of the pump. A guide sleeve and a restriction rod are installed in the housing. The saddle abuts against the valve body by means of a steel ring. The ball sits in the saddle and blocks the passage hole. (Method, guidance. EB Dumler, GI Bikbulatova. Submersible centrifugal pumping units, - AGNI, 2009. - 41 s).

During operation of installations equipped with ball valves, a number of disadvantages were identified:

- leaky ball seating in the saddle when containing large mechanical impurities in the formation;

- valve actuation speed is less than that of a poppet type valve.

Known multifunctional valve assembly, which performs the functions of check and drain valves. The valve consists of a body, a movable sleeve, two sub connected to the body on the thread. The housing is made of radial channels. The sleeve has a lower seat (a ball sits on it), and an upper seat made in the form of a sealant and cams, the latter being installed in the sleeve with the possibility of their radial movement and interaction with the body and the working tool-ball. The radial channels of the sleeve are aligned in its lowest position with the radial channels of the body, while the annulus of the well communicates with the internal cavity of the pipes (Submersible centrifugal pumps and centrifugal vortex modular pumps. Catalog of CJSC NOVOMET - PERM. - Perm, 1999 - 12 from.).

Despite the versatility and the ability to provide various operations during the operation of the installation, the valve assembly has some disadvantages: partial destruction of the nozzle associated with loss of tightness of the ball, low life, and complication of downhole equipment, which increases its cost.

The closest analogue, that is, the prototype is a check valve type KO, which is located between the pump 1 and the drain valve. The non-return valve consists of a housing 13, on one side of which there is an internal tapered thread for connecting the drain valve, and on the other hand, an external tapered thread for screwing into the fishing head of the upper section of the pump 1. Inside the housing 13 there is a metal seat with a rubber insert 14, on which is supported by the valve disc 15. The valve disc 15 has the possibility of axial movement in the guide sleeve 16. Under the influence of the pumped fluid flow, the valve disc 15 rises, thereby opening stroke in the valve. The safety sleeve 17 mitigates the impact of the valve plate 15 against the guide sleeve 16 when opening the valve. When the pump 1 stops, the valve plate 15 lowers onto a metal seat with a rubber insert 14 under the influence of a liquid column in the pressure pipe, that is, the valve closes. For the period of transportation and storage, the KO type check valve is closed with lids 19 and 20. (Method, guidance. Technique and technology for oil and gas production and preparation, - AGNI, 2011. - 36 p.)

The disadvantage of valve assemblies is damage to the guide sleeve due to the actuation of the drain valve assembly, which is installed in the layout of the downhole equipment of the installation above the return.

To prevent the destruction of parts of the valve assembly and eliminate imperfections of the known devices, it is proposed to create a valve assembly in which there are no disadvantages of the above structures.

The objective of the utility model is to create a device that increases operational reliability indicators, simplifies the design, increases the overhaul period, and extends the life of pumping equipment.

The problem is solved by the proposed ESP check valve.

The ESP check valve contains a seat, a locking element (hereinafter valve plate) and a safety sleeve.

New is that the proposed design of the ESP check valve is installed in the lower part of the upper module of the pump section and can be made in two versions: with a metal seat or with a rubber seat in the pump casing.

A new one is that to prevent axial displacement of the shaft protective sleeve, a retaining ring is provided, in both versions of the valve it is proposed to install the shaft protective sleeve on the shaft with the upper end end-to-end with the supporting sleeve, and the shaft protective sleeve should be locked with the locking ring in the lower part.

Eliminates the cause of premature failure of the guide sleeve of the existing design of the KO type check valve (prototype), which is described above, which in turn increases the overhaul period of the installation and the service life of the claimed utility model.

The proposed utility model is illustrated by drawings, where:

- in FIG. 1 - The existing General view of the installation of a submersible centrifugal electric pump type ESP;

- in FIG. 2 - General view of the installation of a submersible centrifugal electric pump type ESP (proposed design);

- in FIG. 3 - Check valve type KO (prototype);

- in FIG. 4 - The design of the check valve ESP;

- in FIG. 5 - The design of the check valve ESP with a rubber seat;

- in FIG. 6 (a, b) - Location diagrams of valve assemblies in the ESP body.

In FIG. 1 shows the existing general view of the installation of a submersible centrifugal electric pump of the ESP type, where: a pump with an electric motor 1, a compensator 2, a protector 3, an ESP 4, a check and drain valve assemblies 5, a mounting belt 6, a cable line 7, an autotransformer 8, an external connection point 9, control station 10, wellhead equipment 11, tubing string 12.

In FIG. 2 presents a General view of the installation of a submersible centrifugal electric pump type ESP (proposed design). Where, respectively: electric motor 1, compensator 2, protector 3, ESP 4, drain valve 5, mounting belt 6, cable line 7, autotransformer 8, remote connection point 9, control station 10, wellhead equipment 11, tubing string 12 .

In FIG. 3 shows a KO type check valve (prototype) consisting of: a body 13, a metal seat with a rubber insert 14, a valve plate 15, a guide sleeve 16, a safety sleeve 17, a restrictive ring 18, a protective cover 19, a protective plug 20.

In FIG. 4 shows the proposed design of the ESP check valve with a metal seat with a rubber insert 14. The main details of which are: a metal seat with a rubber insert 14, a valve plate 15, a shaft protecting sleeve 21, a safety sleeve 17.

In FIG. 5 shows the proposed ESP valve with a rubber seat. The valve assembly includes the following parts: a rubber seat 22, a valve disc 15, a protective sleeve of the shaft 21, a safety sleeve 17.

In FIG. Figure 6 shows the layout of the non-return valve in the ESP body in two versions: a) with a metal b) a rubber seat.

In the diagrams respectively:

a) a metal seat with a rubber insert 14, a valve disc 15, a shaft protecting sleeve 21, a retaining ring 23, a support sleeve 24, a base (module head) 25, a pump housing 26, a lower bearing 27, a safety sleeve 17.

b) a rubber seat 22, a disk of the valve 15, a protective sleeve of the shaft 21, a lock ring 23, a pump housing 26, a safety sleeve 17, a base (module head) 25, a support sleeve 24, a lower bearing 27.

To install the valve with a rubber seat 22, it is necessary to bore the conical surface of the pump body 1, and then the rubber seat 22 is pressed into the pump body 26. When carrying out repairs, the rubber seat 22 should be removed from the bore of the pump housing 26 and replaced with a new one, having previously been cleaned conical surface under the rubber seat 22. The rubber seat 22 should be made of oil-resistant - nayrite rubber.

To install a metal seat with a rubber insert 14, a cylindrical bore of the base (body part of the module sections) is performed. The protective sleeve of the shaft 21 is mounted on the shaft (not indicated in Fig.). A valve disc 15 is mounted on the shaft protecting sleeve 21, which is axially movable relative to this shaft protecting sleeve 21. The valve 15 plate movement is limited by the collar of the shaft protecting sleeve 21 and the metal seat with a rubber insert 14 of the valve. The impact of the valve plate 15 when lifting about the shoulder of the protective sleeve of the shaft 21 is absorbed by the safety sleeve 17, which is made of oil-resistant - nayrite rubber. The rubber insert of the metal seat 14 of the same material is pressed into the metal seat of the valve assembly to increase the degree of tightness when closing the passage opening.

During assembly work, the ESP valve is installed in the lower part of the upper module of the pump section 1 in the head module 25. Next, the assembly of the pump 1 units and subsequent testing on the stands are performed. After assembly work and transportation of the pumping unit to the well, the pumping equipment is lowered into the well. The ESP goes down into the well at the tubing string 12. Next, the equipment of the wellhead 11, a complex of ground equipment (autotransformer 7, remote connection module 9, control station 10) are installed.

The equipment must be grounded. The start-up of pump 1 must be carried out in accordance with the regulatory and technical documentation by qualified personnel.

The principle of operation of the ESP check valve: when pump 1 is started, the liquid sucked in through the intake filter (not shown in Fig.) Enters the blades of the rotating impeller of pump 1. When the impeller rotates, under the influence of the blades, the liquid acquires speed and pressure and then moves up the tubing string 12. Under the influence of fluid pressure, the valve disc 15 moves upward relative to the protective sleeve of the shaft 21 to the shoulder, opening the passage opening for the fluid being pumped. Through the tubing string 12, the fluid enters the equipment of the wellhead 11 and is then transported through the pipeline.

When the pump 1 is stopped, the pumped liquid flows down the tubing string 12 and actuates the valve plate 15, which moves axially down, sits in a metal seat with a rubber insert 14 of the ESP check valve and prevents the possibility of draining the liquid from pump 1. Thus, the reverse The ESP valve facilitates the start of the submersible electric pump and prevents the reverse rotation of the pump 1 rotor (turbine mode) under the influence of a liquid column in the tubing string 12 when pump 1 is stopped.

The principle of operation of the valve assembly with a rubber seat 22 is similar to the principle of operation of the above valve design. A feature is that when using the rubber seat 22, the highest tightness of the valve assembly is achieved due to the elastic properties of the rubber.

A feature of this design is the gap between the outer surface of the protective sleeve of the shaft 21 and the valve plate 15, the gap should provide free movement of the valve plate 15. The clearance between the valve plate 15 and the protective sleeve of the shaft 21 should be no more than 0.163 mm.

The advantages of this design of the ESP check valve are:

a) the simplicity of design and manufacture;

b) ease of repair and replacement of parts;

c) reduction of metal consumption of the installation (due to exclusion from the installation of the body part of the check valve);

d) reduction of manufacturing costs;

e) reduction of time for hoisting operations (STR);

g) reduction in the number of components of the installation.

The proposed check valve will eliminate the disadvantages of the above valves, as well as reduce the length of the entire installation as a whole and at the same time maintain its functions.

The material of the protective sleeve should be selected from anti-corrosion, anti-friction, high-strength material.

Thus, the presented ESP check valve eliminates the imperfections of existing valve assemblies.

Claims (1)

The check valve of the installation of an electric centrifugal pump, comprising a seat, a valve shut-off plate and a safety sleeve, characterized in that the valve is installed in the lower part of the upper module of the pump section with the possibility of manufacturing in two versions: with a metal seat or with a rubber seat in the pump housing, moreover, the protective sleeve of the shaft is mounted on the shaft with the upper end end-to-end with the support sleeve, while the protective sleeve of the shaft is locked with a retaining ring in the lower part.

Images