RU2789294C1 - Reverse check valve - Google Patents

Abstract

FIELD: pipeline fittings.

SUBSTANCE: invention relates to pipeline fittings and is intended for use in the oil industry, namely in downhole equipment in the production of formation fluid, preventive maintenance, flushing and development of wells. The reversible check valve contains a cylindrical body with connecting threads at the ends, as well as a locking element in the form of a ball, while in the center of the body a conical recess is made, in which a seat for the locking element is placed in the form of a steel ball, above which a ball lifting limiter with a vertical groove is installed, which, with its wall, faces the body wall, and hangs over the ball with an inclined end. The inclined end of the limiter is made flat. A conical cavity in the form of a nozzle is made in the lower part of the housing. The outlet channel is formed by a vertical groove of the ball lift limiter and a smooth housing wall. The cross-sectional area of the outlet channel is greater than the cross-sectional area of the seat hole, and the axes of the inlet and outlet channels are parallel.

EFFECT: invention is aimed at reducing the hydraulic resistance to fluid flow.

1 cl, 5 dwg

Description

The invention relates to pipeline fittings and is intended for use in the oil industry, namely in downhole equipment in the production of reservoir fluid, preventive maintenance, flushing and development of wells.

Known reversible check valve containing a cylindrical housing of two half-shells with a stepped hole in which a stepped cylindrical valve module is installed with annular gaps formed by the inner surface of the half-shells and the outer surface of the steps, respectively. The module has multidirectional holes connected to non-intersecting inclined axisymmetric channels, respectively, the size and number of which depend on the flow area of the reverse reversing valve. The holes are equipped with annular seats and locking elements (balls) forming valves of direct and reverse action, respectively. The valve module is equipped with a limiter for the axial movement of the ball. The limiter has holes for the passage of fluid. The ball is pressed by a spring by means of a stop in which a stepped hole is made to accommodate the ball and longitudinal holes for the passage of liquid. To regulate the compression of the spring, its second end is provided with an adjusting nut installed by means of a threaded connection in the semi-body (Patent RU 2449192 C1).

The disadvantage of the known reversible check valve is the increased resistance to the passage of the flushing fluid through the valve due to the preload of the ball by the spring. In addition, the ingress of solid particles between the coils of the spring and the inner wall of the housing will prevent the compression of the spring, which leads to an increase in the hydraulic resistance to the flow of the flushing fluid. And also the disadvantage of this valve is a limiter with holes and a ball placed at the outlet of the passage channel, which resist the passage of formation fluid.

Known reversible check valve containing a cylindrical body with connecting threads at the ends, two threads are made in the body, the lower one for attaching the seat for the locking element made in the form of a steel ball, and the upper thread for attaching the ball lifting limiter. The seat for the ball is made with a conical recess facing the inlet of the seat. An outlet channel is made in the ball lifting limiter, a radial groove is made parallel to the outlet channel, which hangs over the ball and protects it from the vertical impact of the flushing liquid, and also facilitates its movement to the upper part of the cavity, while the reaction force of the jet keeps the ball in the upper part of the cavity for the entire the period of passage of the liquid through the reverse reversing valve (Patent No. 2739410).

The disadvantage of the known reverse reversing valve is that when the produced fluid passes through the reverse reversing valve, it encounters resistance in the form of the lower annular end of the seat, as well as the overhang of the concave wall of the radial groove over the inlet, the jet direction changes to the opposite, which slows down the passage of fluid through the reverse reversing valve, in addition, the end face is braked in front of the outlet channel.

The technical result to be achieved by the invention is to reduce the hydraulic resistance to fluid flow.

This problem is solved due to the fact that the check valve is reversible, contains a cylindrical body with connecting threads at the ends, as well as a locking element in the form of a ball; which has a ball lifting limiter with a vertical groove, which is facing the wall of the housing with its wall, and hangs over the ball with an inclined end. The inclined end of the limiter is made flat. A conical cavity in the form of a nozzle is made in the lower part of the housing. The outlet channel is formed by a vertical groove of the ball lift limiter and a smooth housing wall. The cross-sectional area of the outlet channel is greater than the cross-sectional area of the seat hole, and the axes of the inlet and outlet channels are parallel.

Due to the fact that in the reverse reversing valve the inlet channel is made in the form of a conical cavity, which, together with the saddle hole, forms a nozzle, this contributes to the accelerated passage of formation fluid through the reverse reversing valve, and due to the execution of the inclined end above the inlet channel flat when exposed to formation fluid on the butt plane, there is no change in the direction of the jet to the opposite, which reduces the resistance of the reservoir fluid when passing into the outlet channel. The wall of the groove faces the body wall with the missing thread in order to reduce the resistance of the passing fluid.

Valve elements are made of solid materials (metal, plastic, etc.).

The essence of the invention is illustrated by drawings which show:

fig. 1 - general view of the reverse reversing valve;

fig. 2 - profile of the outlet channel of the reverse reversing valve;

fig. 3 - view of the reverse reversing valve in the operating mode;

fig. 4 - view of the reverse reversing valve in the stop mode;

fig. 5 - view of the reverse reversing valve in the flushing mode.

On the data of Fig. shown

1 - body;

2 - input channel;

3 - saddle;

4 - ball;

5 - conical recess;

6 - wall;

7 - limiter;

8 - flat inclined end of the limiter;

9 - output channel;

10 - groove wall;

11 - wall;

12 - cavity.

The reverse reversing valve operates in three modes of operation: working, stopping, flushing.

When the pump is turned on, the produced liquid through the inlet channel 2 exerts pressure on the ball 4, which hits the flat inclined end of the limiter 8, while moving to the upper corner of the cavity 12 and the reaction force of the jet of the produced liquid keeps the ball 4 in the cavity 12 for the entire period of the liquid passing through the check valve reversible.

When stopping mode, the reverse reversing valve operates as follows. When the pump stops, the pressure in the cavity 12 drops and the ball 4 falls on the seat 3, closes the inlet channel 2, while acting as a check valve.

In the flushing mode, the reverse reversing valve operates as follows. When the pump is turned on, the flushing fluid at a pressure exceeding the pressure of the fluid in the vertical pipeline enters channel 9, the fluid encounters an obstacle in the form of an inclined wall 6, and a hydraulic shock occurs on the ball 4, which moves into the cavity 12 and the reaction force of the flushing fluid jet holds the ball 4 in cavity 12 the entire period of passage of the flushing fluid through the reverse reversing valve.

The valve is simple and reliable due to the small number of parts that are easy to manufacture and maintain.

Claims (1)

Reversible check valve, containing a cylindrical body with connecting threads at the ends, as well as a locking element in the form of a ball, while in the center of the body a conical recess is made, in which a seat for a locking element in the form of a steel ball is placed, above which a ball lifting limiter with a vertical a groove with its wall facing the body wall, and with its inclined end hanging over the ball, characterized in that the inclined end of the limiter is made flat, a conical cavity in the form of a nozzle is made in the lower part of the body, the outlet channel is formed by a vertical groove of the ball lifting limiter and a smooth wall of the body, the cross-sectional area of the outlet channel is greater than the cross-sectional area of the seat hole, and the axes of the inlet and outlet channels are parallel.

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