CN210266035U - Multifunctional check valve for water injection well - Google Patents

Abstract

The utility model provides a multifunctional check valve for a water injection well, wherein a connector is sleeved at the tail part in a valve body to form a threaded connection pair; a liquid inlet hole is formed in the pipe wall of the middle part of the connector to form a water flowing channel with the inner cavity of the valve body; the ejector rod switch hole of the valve body is fixedly connected with an ejector rod sleeve and an ejector rod, the ejector rod is abutted against the ejector rod switch hole of the valve body, and the ejector rod is in threaded connection with the ejector rod sleeve through a spare cap to form a sealed safety pressure relief mechanism; a sealing sleeve is sleeved on a connecting rod of the ball seat, and a telescopic mechanism is formed by the rubber ring, the gasket, the spring and the inner cavity of the connector; and a steel ball is arranged in the arc-shaped groove of the ball seat and is propped against the end surface of the water injection channel of the valve body to form a valve mechanism. The utility model discloses an utilize the lead screw principle, clockwise rotation ejector pin promotes the steel ball and removes, opens water injection passageway, with pressure release in the well. The ejector rod, the spare cap and the ejector rod sleeve are provided with rubber rings for sealing, so that pressure leakage is avoided during working, the safety during pressure relief is ensured, the service life is prolonged, and the device is simple to operate, safe and reliable.

Description

Multifunctional check valve for water injection well

Technical Field

The utility model discloses a multi-functional check valve of water injection well is to the improvement of current check valve structure for the oil field, belongs to pipeline valve technical field.

Background

The check valve for the water injection well of the oil field is a control tool which is connected to a water injection well mouth and automatically switched on and off by means of water injection pressure and underground pressure. At present, the check valve for the oil field has the defects that the check valve does not have the backflow prevention function, and in use, when the water injection valve is closed or a water injection pipeline needs to be maintained, the underground pressure is higher than the water injection pressure, the check valve cannot be automatically closed, and the normal production work is influenced; secondly, the safety pressure relief function is not provided, when maintenance is needed, the underground pressure cannot be released for maintenance due to the large underground pressure, and the operation risk is increased; and thirdly, the check valve is connected in a vertical mode, and the installation cannot be carried out if a special-shaped wellhead is met, so that the application range is small.

Disclosure of Invention

The utility model provides a multi-functional check valve of water injection well has solved current check valve and has not prevented returning the problem of telling the function and not having safe pressure release function.

Water injection well multifunctional check valve, its technical solution as follows:

the tail part in the valve body is sleeved with a connector which is sealed by a rubber ring to form a threaded connection pair; a liquid inlet hole is formed in the pipe wall of the middle part of the connector to form a water flowing channel with the inner cavity of the valve body;

the valve body is provided with a push rod switch hole, a push rod sleeve is fixedly connected with the push rod switch hole of the valve body, a sliding push rod is arranged in the push rod sleeve, the push rod pushes against the push rod switch hole of the valve body, and a standby cap connects the push rod on the push rod sleeve through a rubber ring in a threaded manner to form a sealed safety pressure relief mechanism;

the front end of the connector is provided with a sealing sleeve which forms a sealed threaded connection mechanism through a rubber ring;

a sealing sleeve is sleeved on a connecting rod of the ball seat, and a telescopic mechanism is formed by the rubber ring, the gasket, the spring and the inner cavity of the connector;

and a steel ball is arranged in the arc-shaped groove of the ball seat and is propped against the end surface of the water injection channel of the valve body to form a valve mechanism.

The utility model has the advantages of:

the anti-backflow function is to utilize the elasticity of the spring to push the ball seat and the steel ball to move so as to close the water injection channel. When the water injection pressure is zero, the spring pushes the gasket, the ball seat and the steel ball to move by means of elasticity, the water injection channel is closed rapidly, manual adjustment is not needed, and the working cost is saved. The steel ball is arranged in the groove at the upper part of the ball seat, so that the reliability of the steel ball in the moving process is ensured. The ball seat is sealed with the sealing sleeve and the connector by the rubber rings, so that a sealing space is formed, the spring is positioned in the sealing space, rusting and corrosion cannot be caused in the long-time use process, the service life of the spring can be prolonged better, and the service life of the tool is prolonged.

The safety pressure relief function is to utilize the lead screw principle, rotate the ejector pin clockwise, promote the steel ball and remove, open the water injection passageway, release the pressure in the well. The ejector rod, the spare cap and the ejector rod sleeve are provided with rubber rings for sealing, so that pressure leakage is avoided during working, the safety during pressure relief is ensured, the service life is prolonged, and the device is simple to operate, safe and reliable. The utility model discloses the appearance is small and exquisite, does not receive water injection well head space restriction, can vertical installation, also can transversely install.

Drawings

FIG. 1 is a schematic diagram of the structure of the present invention;

the automatic valve comprises a valve body 1, a steel ball 2, a ball seat 3, a sealing sleeve 4, a gasket 5, a spring 6, a connector 7, a rubber ring a 8, a liquid inlet hole 9, a rubber ring b 10, a rubber ring c 11, a rubber ring d 12, a push rod 13, a spare cap 14, a push rod sleeve 15, a rubber ring e 16, a rubber ring f 17, a water injection channel 18 and a push rod switch hole 19.

Detailed Description

The invention is further described by the following figures:

as shown in fig. 1, the utility model mainly comprises a valve body 1, a steel ball 2, a ball seat 3, a sealing sleeve 4, a gasket 5, a spring 6, a connector 7, a mandril 13, a spare cap 14 and a mandril sleeve 15; wherein the content of the first and second substances,

the tail part in the valve body 1 is sleeved with a connector 7 and sealed by a rubber ring 8a to form a threaded connection pair; a liquid inlet hole 9 is formed in the middle pipe wall of the connector 7 to form a water flowing channel with the inner cavity of the valve body 1;

a push rod sleeve 15 is fixedly connected to a push rod switch hole 19 of the valve body 1, a sliding push rod 13 is arranged in the push rod sleeve 15, the push rod 13 pushes against the push rod switch hole 19 of the valve body 1, and a standby cap 14 connects the push rod 13 to the push rod sleeve 15 through a rubber ring 16e and a rubber ring 17f in a threaded manner to form a sealed safety pressure relief mechanism;

the front end of the connector 7 is provided with a sealing sleeve 4 which forms a sealed threaded connection mechanism through a rubber ring 10b, a rubber ring 11c and a rubber ring 12 d;

a sealing sleeve 4 is sleeved on a connecting rod of the ball seat 3, and a telescopic mechanism is formed by a rubber ring 12d, a gasket 5, a spring 6 and an inner cavity of the connector 7;

a steel ball 2 is arranged in the arc-shaped groove of the ball seat 3, and the steel ball 2 is pressed against the end surface of the water injection channel 18 of the valve body 1 to form a valve mechanism.

The utility model discloses the working process is as follows:

the water injection operation process comprises the following steps: referring to fig. 1, the product is connected to a water injection wellhead pipeline as required, water is injected between pumps, the water enters a water injection channel 18 through a water injection pipeline, the steel ball 2 is pushed to move by means of water injection pressure, the water enters the well through a liquid inlet hole 9, and water injection operation is completed.

The anti-return process: when stopping injecting water between the pumps, the water injection pressure is zero, the spring 6 pushes the gasket 5, the ball seat 3 and the steel ball 2 to move by means of elasticity, the steel ball 2 is pushed against the end face of the upper part of the valve body 1 to stop, 18 water injection channels are closed, 2 steel balls are further pushed by means of underground pressure, and the underground pressure cannot enter 18 water injection channels at the moment, so that the backflow prevention function is realized.

The safe pressure relief process: when the pressure relief valve needs to be maintained, after the valve body 1 is connected with a pipeline or a pump truck, a special wrench is sleeved at a wrench opening at the upper part of the ejector rod 13, the ejector rod 13 is rotated clockwise, the ejector rod 13 enters the valve body 1 by virtue of a lead screw principle, the steel ball 2 is pushed by the lower end face of the ejector rod 13 to move, and at the moment, underground pressure enters a water injection pipeline or the pump truck through the water injection channel 18, so that the safety pressure relief function is realized.

Claims (2)

1. The utility model provides a multi-functional check valve of water injection well which characterized in that:

the tail part in the valve body is sleeved with a connector which is sealed by a rubber ring a to form a threaded connection pair; a liquid inlet hole is formed in the pipe wall of the middle part of the connector to form a water flowing channel with the inner cavity of the valve body;

the valve body is provided with a push rod switch hole, a push rod sleeve is fixedly connected to the push rod switch hole of the valve body, a sliding push rod is arranged in the push rod sleeve, the push rod is pushed against the push rod switch hole of the valve body, and a standby cap connects the push rod on the push rod sleeve through a rubber ring e and a rubber ring f in a threaded manner to form a sealed safety pressure relief mechanism;

the front end of the connector is provided with a sealing sleeve which forms a sealed threaded connection mechanism through a rubber ring b and a rubber ring c;

a sealing sleeve is sleeved on a connecting rod of the ball seat, and a telescopic mechanism is formed by the rubber ring d, the gasket, the spring and the inner cavity of the connector;

and a steel ball is arranged in the arc-shaped groove of the ball seat and is propped against the end surface of the water injection channel of the valve body to form a valve mechanism.

2. The multifunctional check valve for water injection well according to claim 1, characterized in that:

the middle pipe wall of the connector is evenly distributed with 4 liquid inlet holes.

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