RU2446315C2 - Shock absorber of electric centrifugal pump in well - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: shock absorber includes housing with annular sectors from elastic material, which are made in the form of a set of split plates. In plates there arranged are radial slots on external surfaces, hydraulic connection channels for flow of working medium, open and closed slots for location of electric cable of pump and annular turnings on end surfaces of plates, which interact with annular bores on end surfaces of spacer split rings located between plates on external surface of connection head of pump modular section. Splits of plates with closed slots are offset at an angle relative to each other, and external surfaces of plates interact in turn with certain design tightness with internal surface of production string.

EFFECT: enlarging functional capabilities when using shock absorber in oil and water intake wells at high working medium temperature.

5 dwg

Description

The invention relates to the field of mining, in particular to the oil industry, and can be used to damp vibration, prevent the pendulum effect, protect the electric cable from mechanical damage to electric centrifugal pump installations with suspension of tubing in oil and gas extraction and water wells, both during tripping and and during operation.

Known devices for damping oscillations, comprising a cylinder body, a piston with a rod, throttling holes, support rings [USSR author's certificate No. 1610127 A1, F16F 9/50, 1990; USSR copyright certificate No. 697763 A, F16F 9 / 48.1979].

A disadvantage of the known devices is their limited functionality, especially when used in extreme conditions that occur in oil and water wells equipped with electric centrifugal pumps.

Closest to the invention is a shock absorber device for damping the vibration of an electric centrifugal pump installation and preventing the pendulum effect of the suspension of tubing in oil and water wells, comprising a housing with annular sectors of elastic material distributed evenly on the outer surface, grooves for overflow of the working medium and location electric cable of an electric centrifugal pump [RU 2206792 C2, cl. F04B 47/14, F16F 1/376, 04/27/2002].

The disadvantages of the known device is its limited functionality, as well as its operational unreliability in oil and water wells.

The objective of the invention is to expand the functionality when using the shock absorber device in oil and water wells, where the temperature of the working medium reaches 100 ° C or more, where the shock absorber device experiences great mechanical stress both during operation and during hoisting operations of the suspension of the tubing equipped with installations of electric centrifugal pumps.

When wells are operated by electric centrifugal pumps, accidents occur, breaks in flange connections, bodies, and necks of sections of electric centrifugal pumps.

The main cause of accidents is vibration and the pendulum effect of an electric centrifugal pump with a suspension of tubing during its operation, as well as mechanical damage to the cable in the well during tripping.

The technical result is achieved by the fact that in the shock absorber device for damping the vibration of the electric centrifugal pump installation and preventing the pendulum effect of the suspension of the tubing in oil and water wells, comprising a housing with annular sectors of elastic material distributed evenly on the outer surface, grooves for the overflow of the working medium and the location of the electric cable of the electric centrifugal pump, according to the invention, the annular sectors are made in the form of a set of split discs, in di there are radial slots on the outer surfaces, hydraulic communication channels for the overflow of the pumped medium, open and closed grooves for the location of the electric cable of the electric centrifugal pump, and ring grooves on the end surfaces of the disks with the possibility of their interaction with the corresponding annular bores on the end surfaces of the spacer split rings located between the disks on the outer surface of the connecting head of the module section of the electric centrifugal pump, and the cuts of the discs are closed bubbled slots are offset relative to each other, and the outer surfaces of the discs, alternately with interference interacts with an inner surface of the production tubing in the well.

Figure 1 shows the shock absorber device of an electric centrifugal pump in a well.

Figure 2 is a view of B in figure 1.

Figure 3 is a section aa in figure 2.

Figure 4 shows the mounting option of the split discs on the outer surface of the connecting head of the module section of the electric centrifugal pump when performing on the end surfaces of the annular protrusions interacting with the annular grooves made on the end surfaces of the spacer split rings.

Figure 5 shows the mounting option of the split discs on the outer surface of the connecting head of the module section of the electric centrifugal pump with smooth end surfaces interacting with the smooth end surfaces of the split spacer rings.

The shock absorber device of an electric centrifugal pump in a well comprises:

disks 1 (figure 1, figure 2, figure 3, figure 4, figure 5);

outer surfaces of 2 disks 1;

open grooves of 3 discs 1;

closed grooves of 4 disks 1;

spacer rings 5;

end surfaces 6 of spacer rings 5;

annular bores 7 on the end surfaces 6 of the spacer rings 5;

electric cable 8 of an electric centrifugal pump;

production casing 9;

inner surface 10 of production casing 9;

the connecting head 11 of the module section of the electric centrifugal pump;

the outer surface 12 of the connecting head 11;

hydraulic communication channels 13;

end surfaces of 14 disks 1;

annular turning 15 on the end surfaces 14 of the disks 1;

coupling 16;

cuts 17 in the disks 1 with open grooves 3 (figure 3);

sections 18 in disks 1 with closed grooves 4;

radial slots 19 on the outer surfaces of 2 disks 1;

the bias angle (β) of 20 cuts 18 relative to each other in the disks 1 with closed grooves 4;

sections of 21 spacer rings 5;

annular grooves 22 on the end surfaces 6 of the spacer rings 5 (figure 4);

annular protrusions 23 on the end surfaces 14 of the disks 1;

smooth surfaces 24 of the ends 6 of the spacer rings 5 (figure 5);

smooth surfaces of 25 ends of 14 disks 1;

In the static position, the elements of the shock absorber device of the electric centrifugal pump interact as follows.

On the outer surface 12 of the connecting head 11 of the module section of the electric centrifugal pump through the openings 18 with closed grooves 4 and through the openings 17 with open grooves 3 are installed disks 1.

Between the end surfaces 14 of the disks 1, through the slits 21, spacer rings 5 are installed on the outer surface 12 of the connecting head 11 of the module section of the electric centrifugal pump.

When this annular bores 7, made on the end surfaces 6 of the spacer rings 5, interact with the annular turning 15 made on the end surfaces 14 of the disks 1.

After mounting the disks 1 and the spacer rings 5 on the outer surface 12 of the connecting head 11 of the module section of the electric centrifugal pump, the electric cable 8 passes through the open 3 and closed 4 grooves of the disks 1, and the cuts 18 of the disks 1 with the closed grooves 4 are offset by an angle (β ) twenty.

A shock absorber device for damping the vibration of the installation of the electric centrifugal pump and preventing the pendulum effect of the suspension of the tubing is one or more mounted on the outer surfaces 12 of the connecting heads 11 of the module section of the electric centrifugal pump, and, if necessary, on the outer surface of the tubing.

In the process of lowering the suspension of tubing with the installation of an electric centrifugal pump, with an electric cable 8 and with shock absorber devices, hydraulic fluid overflows through the hydraulic communication channels 13 and the pressure in the volumes of the production string 9 separated by shock absorber devices is equalized.

In this case, the electric cable 8 passes through the open 3 and closed 4 grooves of the disks 1, which makes it possible to protect the electric cable 8 from mechanical damage during the descent-lifting of the suspension of tubing with an electric centrifugal pump when the shock absorber device interacts with the inner surface 10 of the production casing 9 connected to coupling 16.

The presence of radial slots 19 on the outer surfaces 2 in the disks 1 ensures the elasticity of the disks 1 when they interact through the outer surfaces with the inner surfaces 10 of the production string 9 during hoisting operations of the suspension of the tubing.

Figure 4 shows a variant of the shock absorber device, in which annular protrusions 23 are made on the end surfaces 14 of the disks 1, and annular grooves 22 are made on the end surfaces 6 of the spacer rings 5, which increases the reliability of the connecting discs 1 and the spacer rings 5 and ensures the reliability of the shock absorber device mounted on the outer surface 12 of the connecting head of the module section of the electric centrifugal pump, for horizontal wells.

Figure 5 shows a variant of the shock absorber device, in which the ends 6 of the spacer rings 5 have smooth surfaces 24, interacting with the smooth surfaces 25 of the ends 14 in the disks 1, and are intended for shallow wells, such as water wells.

During the descent of the suspension of tubing with the installation of an electric centrifugal pump with an electric cable and with a shock absorber to provide a calculated interference fit, some disks can bend as a result of interaction with the inner surface 10 of the production string 9, other disks can contact the inner surface 10 of the production string 9 and subsequent discs can be positioned with a gap relative to the inner surface 10 of the production string 9, since the inner surface 10 of the operational ion column according to GOST 632-80 (casing pipes and couplings to them) clause 1.4 has deviations in size during manufacture and changes during operation.

In the dynamic position, the elements of the shock absorber device interact as follows.

During the rotation of the electric centrifugal pump, the disks 1 with the outer surfaces 2 with a calculated interference fit with the inner surface 10 of the production casing 9, which allows to reduce the vibration of the electric centrifugal pump and at the same time prevent the pendulum effect of the electric centrifugal pump and the suspension of the tubing.

The proposed new technical solution for a shock absorber device for damping vibration and preventing the pendulum effect of electric centrifugal pump installations and tubing suspension, as well as protecting the electric cable from mechanical damage during tripping operations in oil and water wells, differs from the known technical solutions by its novelty, it’s easy to manufacture, convenient for installation and dismantling, reliable in operation, competitive and its use in production will give false technical and economic effect.

Claims (1)

A shock absorber device for damping the vibration of an electric centrifugal pump installation and preventing the pendulum effect of the suspension of tubing in oil and water wells, comprising a housing with annular sectors of elastic material distributed evenly on the outer surface, grooves for the overflow of the working medium and the location of the electric cable of the electric centrifugal pump, different the fact that the annular sectors are made in the form of a set of split disks, radial slots are placed in the disks on the outer surfaces, hydraulic communication channels for the overflow of the working medium, open and closed grooves for the location of the electric cable of the electric centrifugal pump and ring grooves on the end surfaces of the disks with the possibility of their interaction with the corresponding annular bores on the end surfaces of the spacer split rings located between the disks on the outer surface of the connecting head module -sections of an electric centrifugal pump, and the cuts of disks with closed grooves are offset relative to each other, and the outer The surface of the disc, alternately, with an interference fit with the inner surface of the production casing in the well.

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