RU2285179C2 - Check valve - Google Patents

Abstract

FIELD: mining.

SUBSTANCE: check valve comprises housing, conical chamber, valving member with the axle, and conical plug. The housing has two openings at its center. One of the openings is used for fluid flow and is provided with flexible bushing mounted on the outer surface of the housing that cooperates with the inner surface of the pump-compressor pipe. The other opening receives the valving member whose axle with the collar and conical plug are interconnected by means of a threaded joint through the side passages in the chamber. The outer side of the housing is provided with projections that cooperate with the faces of the pump-compressor pipes connected with the clutch. The valving member is mounted with a spaced relation between the collar of the axle and the member that overlaps the opening for fluid flow when the conical surface of the plug cooperates with the chamber.

EFFECT: reduced cost, enhanced reliability, and prolonged service life.

Description

The invention relates to the field of mining, in particular to the oil and gas industry, and can be used in oilfield equipment to install a check valve in the inner diameter of tubing connected to the coupling between their end surfaces in order to protect the electric centrifugal pump from the reverse effect of liquid pressure in the suspension lift of tubing when it is turned off in the well, and also as both discharge and suction valves in the pump equipment, for example, for submersible pumps of pumping units.

Known check valves containing housings, seats and locking elements. (Driller's companion. Handbook. K.V. M .: Nedra, 1990, p. 84 fig. 5.23, p. 90 fig. 34, fig. 35, p. 160 fig. 7.9).

The disadvantages of the known check valves is their unreliability in oil and gas wells during operation, especially at high pressures (25 MPa and above), which leads to additional material and labor costs associated with lifting from the wells of suspensions of tubing with electric centrifugal or rod pumps for valve repair or replacement with new ones.

Known check valve, comprising a housing, a chamber with a conical surface, a locking element with an axis and a plug with a conical surface. (Patent RU 2205310 C2, 05.27.2003, F 16 K 15/14).

The disadvantages of the known valve are the complexity of the design, manufacture, the inability to install between the ends of the tubing, screwed with a sleeve.

The technical task of the invention is the new use of the connecting elements of tubing connected to the coupling in the well during installation and operation of the valve, to reduce the elemental base of the valve design, to reduce the cost of its manufacture, to increase the reliability and useful life, in the convenience of its maintenance, maintainability and competitiveness.

The solution to the technical problem is achieved by the fact that in the check valve for tubing containing a housing, a chamber with a conical surface, a locking element with an axis and a plug with a conical surface, according to the invention, two openings are made in the center of the housing, one for the fluid flow with elastic a sleeve on the outer surface of the housing, interacting with the inner surface of the tubing, another for installing a locking element, an axis with a shoulder and a tube with a conical surface which is connected through a threaded connection through lateral channels made in the chamber with a corresponding conical surface, moreover, protrusions are made on the outer surface of the housing interacting with the end surfaces of the tubing connected to the coupling, and the locking element is installed with a gap between the shoulder of the axis and the end surface of the housing with the ability to move in the chamber and overlap the hole for the fluid flow during the interaction of the conical surfaces of the tube and the chamber.

Figure 1 shows the check valve in the open position, installed in the coupling between the ends of the tubing.

Figure 2 - check valve in the closed position.

Figure 3 is a section aa in figure 1.

Figure 4 is a section bB in figure 3.

Figure 5 is a variant of the installation of the locking element in the chamber with repair gaskets installed between the flange of the axis and the end surface of the housing and a variant of the locking element reinforced with a metal screw in the housing chamber.

Figure 6 - design of the valve body.

In Fig.7 is a section bb in Fig.6.

In Fig.8 is a section GG in Fig.6.

The check valve contains:

building 1,

a hole for the flow of fluid 2, made in the housing 1,

elastic sleeve 3,

inner surface 4 of the tubing,

plug 5 with a conical surface,

hole 6 for mounting the axis with the shoulder,

axis 7,

shoulder 8,

the end surface 9 of the housing 1,

side channels 10 made in the chamber 11,

chamber 11 with a conical surface,

end surfaces 12 of tubing,

protrusions 13 made on the outer surface of the housing 1,

clutch 14,

the gap Δ between the shoulder 8 of the axis 7 and the end surface 9 of the housing 1,

repair pads 15,

screw 16.

In a static position, the design elements of the check valve interact as follows.

In the valve body 1 of the check valve through the side channels 10, a plug 5 with a conical surface is installed in the chamber 11 with the corresponding conical surface (Figs. 1, 6).

Through the hole 6 of the housing 1, an axis 7 is installed with a shoulder 8 and the locking element is connected by means of a threaded connection in the chamber 11 with a conical surface through the side channels 10 (Fig.6, 8).

On the outer surface of the hole for the flow of fluid 2, for example through a threaded connection, install an elastic sleeve 3 (figure 1).

After assembling the locking element in the chamber 11 of the housing 1, a gap Δ is determined between the shoulder 8 of the axis 7 and the end surface 9 of the housing 1, which is necessary to compensate for the wear of the conical surfaces of both the chamber 11 and the plug 5 and to ensure the interactions of the conical surfaces of the plug and the chamber to close the opening for fluid flow 2 during operation in the well (figure 2, 5).

The check valve at the wellhead with a technological tool or, for example, in the process of screwing a tubing with a sleeve 14 through protrusions 13 made on the outer surface of the housing 1, is installed in the inner surface 4 of the tubing (Figs. 1, 2, 3, 7).

When this elastic sleeve 3 is compressed and overlaps the inner surface 4 of the tubing, and the protrusions 13, made on the outer surface of the housing 1, are located between the end surfaces 12 of the tubing connected to the coupling 14 (Fig.2, 3).

In the dynamic position, in the well, when starting the electric centrifugal pump under the pressure of the pumped medium flow, the shut-off element, moving in the chamber 11 and simultaneously in the hole 6, opens the valve, the pumped medium through the side channels 10, bending around the shut-off element and the housing 1 in the direction indicated by arrows , enters the inner diameter 4 of the tubing, then rises at the wellhead and enters the oil gathering (Figs. 1, 4).

During a planned or emergency stop of the electric centrifugal pump by the reverse pressure of the liquid column in the elevator of the tubing in the direction indicated by the arrows, the locking element moves simultaneously in the hole 6 and in the chamber 11 and as a result of the interactions of the conical surfaces of the plug 5 and the chamber 11, closes the hole for the fluid flow 2 and thereby eliminates the unwinding of the electric centrifugal pump in the opposite direction, protecting it from damage in the well (Fig.2, 5).

The presence in the design of the valve of the reverse protrusions 13, made on the outer surface of the housing 1, allows you to use the end surfaces 12 of the tubing connected to the coupling 14, and to exclude the bursting of the valve in the elevator of the tubing (Fig.3, 7, 8).

The presence of a gap Δ between the shoulder 8 of the axis 7 and the end surface 9 of the housing 1 allows compensation of the wear of the conical surfaces of the plug 5 and the chamber 11, and thereby ensures the reliability of the sealing of the check valve during planned or emergency stops of the electric centrifugal pump in the well, which in turn increases the term operation of the check valve in the well (Fig.2, 5).

The proposed valve has a high maintainability.

To restore the operating characteristics of the check valve, it is necessary to trim the shoulder 8 of the axis 7 with a gap Δ between the end surface 9 of the housing 1 and the shoulder in stationary conditions.

Figure 5 shows an installation option in the chamber housing of the locking element with repair gaskets 15 and screw 16, additionally connecting the plug 5 with a conical surface and axis 7 with a shoulder 8.

This allows you to increase the strength characteristics of the locking element and ensure maintainability of the check valve in the field by removing one of the repair gaskets 15, in order to compensate for the wear of the conical surfaces of the plug 5 and the chamber 11 and to provide a gap Δ between the shoulder 8 of the axis 7 and the end surface 9 of the housing 1.

The check valve is easy to manufacture, reliable in operation, maintainable, competitive, and its use in industry will provide a positive technical and economic effect.

Claims (1)

A check valve for tubing, comprising a housing, a chamber with a conical surface, a locking element with an axis and a plug with a conical surface, characterized in that the center of the housing has two holes, one for the fluid flow with an elastic sleeve on the outer surface of the housing, interacting with the inner surface of the tubing, another for installing the locking element, the axis with the shoulder and the tube with a conical surface which are connected through a threaded connection through the sides channels made in the chamber with a corresponding conical surface, and on the outer surface of the housing there are protrusions interacting with the end surfaces of the tubing connected to the coupling, and the locking element is installed with a gap between the shoulder of the axis and the end surface of the housing with the possibility of movement in the chamber and overlapping the holes for the fluid flow in the interaction of the conical surfaces of the tube and chamber.

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