RU2622962C1 - Device for automatic gas bleeding on pumping pumps - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: device contains a housing with a receiving container and a lid, and a float, together forming a valve for gas bleeding. Wherein the upper part of the receiving container is connected to the branch pipe of the ball valve with an opening at the end for discharging the gas to be bled, and the lower part of the receiving container is connected to the mounting branch pipe with a throughput opening for liquid and gas supply. The float located inside the housing has a two-sided U-shaped cross-section, the upper part of which is the working surface intended for abutment in the opening of the ball valve nozzle in the working position of the valve.

EFFECT: increasing the safety, device reliability and efficiency.

9 cl, 1 dwg

Description

The invention relates to the oil and gas industry, in particular to valve devices for transfer pumps located at the wellhead.

A known valve for discharging air from a hydraulic channel (patent RU No. 2150023, IPC F04B 47/02, E21B 34/02, publ. 05.27.2000), consisting of a housing in which a shut-off valve is mounted with the possibility of axial movement when acting on the lever, connected to the housing bracket and valve stem by axles. The shut-off valve stem is sealed in the housing by a cuff and passed inside a compression spring installed in the groove of the housing and interacting with the lever. The case at the bottom has threads for screwing into the flushing seal instead of the standard plug. The size of the outlet between the shut-off valve head and the valve seat in the housing is set by moving the lever with an adjusting screw, the position of which is fixed in the housing with a lock nut. Air is discharged through a fitting with a hose. Periodic poisoning from the hydraulic channel of the accumulated air is carried out by acting on the lever by manually pulling traction.

Known valve device for bleeding gas (patent RU No. 51094, IPC E21B 34/02, publ. 01/27/2006), the closest in technical essence to the claimed device and adopted as a prototype, including a hollow body with axial and radial channels on the side surface, located therein a valve consisting of a seat and a locking member, a spring and a rod with an adjusting device, as well as an inlet and outlet pipe, the locking member having an internal cylindrical selection, and the stem having an annular flange from below, while the stem has its own annular bead mounted in the inner cylindrical sample of the locking body with the possibility of axial limited movement, in addition, the lower end of the annular shoulder of the rod has the ability to interact with the lower end of the internal cylindrical selection of the locking body, the spring mounted on the rod between the locking body and the adjusting device, while the compression length of the spring limited by the length of movement of the annular collar of the rod in the inner cylindrical sample of the locking element, including a hollow body with axial and radial on the side surface of the channels, a valve consisting of a seat and a locking member, a spring and a rod with an adjustment device, as well as an inlet and an outlet pipe are provided, the locking member having an inner cylindrical selection and the stem with an annular flange from below, with the stem its annular collar is installed in the inner cylindrical sample of the locking body with the possibility of axial limited movement, in addition, the lower end of the annular collar of the rod has the ability to interact with the lower end of the the sample light on the internal cylindrical closure member, said spring mounted on the rod between the locking body and the adjustment device, wherein the compression spring length is limited by the length of the bead ring moving rod in the inner cylindrical locking body sample.

However, the device according to patent RU No. 51094 is not intended for separate bleeding of gas and only works when pressure is exceeded without separation into a liquid and gaseous medium, it has a more complex structure.

Currently, there are no devices capable of triggering upon receipt of liquid after bleeding gas (gas cap).

The claimed device has a simple design, low manufacturing cost, requires no maintenance. Also in the claimed device there is no need for calibration.

The problem to which the invention is directed is to develop a safe, reliable and efficient device for bleeding accumulated gases from transfer pumps to lift liquids from depths operating in an oil and gas medium in order to maintain the readiness of the pumps for continuous start-up (elimination of cavitation).

The technical result to which the invention is directed is to increase the safety, reliability and efficiency of the device while simplifying the design.

The technical result is achieved due to the new valve design, which allows to bleed gas from oil transfer pumps (CNS type) when it accumulates when working in an oil and gas medium.

The inventive device is illustrated in the drawing and consists of the following elements:

1 - housing;

2 - a cover connected to the housing with screws;

3 - through hole of the mounting pipe for the flow of liquid and gas;

4 - ball valve connected to the branch pipe of a ball valve;

5 - a float;

6 - flare nut;

7 - branch ball valve with a hole for stopping the float in the upper position for bleeding gas.

The device comprises a housing 1 with a receiving tank and with a cover 2 and a float 5, which together form a valve for bleeding gas.

The upper part of the receiving tank is connected to the nozzle 7 of the ball valve with an opening at the end for the outlet of the bleed gas, and the lower part of the receiving tank is connected through the mounting pipe to the through hole 3 with a transfer pump for the supply of liquid and gas. The nozzle 7 of the ball valve protrudes into the cavity of the housing 1 and is preferably made so long as to extend into the cavity of the receiving tank.

The housing 1 is connected to the cover 2 by screws and contains a through hole 3 of the mounting pipe in the lower part of the housing for the flow of liquid and gas.

The ball valve 4 is connected to the nozzle 7 of the ball valve by a threaded connection, which contains a hole for bleeding gas.

The float 5 is installed inside the housing with the possibility of its free movement along the vertical axis of the device.

The device is connected to the pump through a union nut 6, which simplifies the process of mounting the device on the pump. However, other connection options may be used. As an example, but not as a limitation, the mounting pipe of the device can be made with an external or external thread and connected to a mounting pipe of a pump made with a corresponding internal or external thread. Also, a device with an assembly pipe made with an external thread can be screwed into the pump mounting hole equipped with a reciprocal thread. In addition, the mounting pipe can be welded to the pump.

The float 5 has an upper working surface for abutment in the hole of the nozzle 7 of the ball valve in its upper working position.

The float 5 is made of solid plastic, has a streamlined shape. The float is made using known methods of processing plastics, for example, by injection molding, or injection molding, or other methods that allow you to perform the float of the desired shape and size.

The shape and material of the float ensure its ease of sliding from the upper to the lower working position, as well as preventing sticking (jamming) of the float in the upper working position.

The float 5 has a two-sided U-shaped cross-sectional shape, and the lower part, made in the form of the letter “P”, is larger than the upper part, made in the form of an inverted letter “P”. All angles and bends of the float are rounded to ensure ease of sliding. Preferably, the legs of the letter "P" of the upper part of the float are made so long as to ensure a tight fit of the float to the nozzle 7 of the ball valve in the upper position of the float.

This form of the float provides a tight tight fit to the hole of the nozzle 7 of the ball valve, which allows you to reliably close the hole in the upper working position of the float and prevent any gas leakage.

Preferably, the float 5 is made in the form of hollow cylindrical elements closed on one side and connected to each other by closed sides. A cylindrical shape is preferred for ease of installation of the float in the cylindrical body of the device. However, other forms of the float 5 are allowed, for example, in the form of a hollow parallelepiped or cube. As another example, it is possible to perform a float in the form of an element formed by stretching an equilateral hexagon or rhombus, which in its cross section by a plane running along the length of the float also provides a U-shaped shape.

The U-shaped cross-sectional shape of the float provides the convenience of its location in the valve structure and provides the necessary freedom of movement inside the device body.

The lower wider part of the design of the float also ensures its stability when the float is in the lower initial position and prevents its accidental displacement to the side during turbulent flows of liquid and gas, as a result, prevents malfunctions during operation of the device.

In one example of implementation, the float is made with a lower part with a maximum transverse size of not less than 1.5-2 times larger than the maximum transverse size of its upper part. In the case of a cylindrical-shaped float, the transverse dimension should be understood as the diameter of the cylinder circumference, from which the lower and upper parts of the float are formed. In other variants of the shape of the float, the transverse dimension should be understood as the distance between its two most distant points.

The transverse partition of the float 5 separating its upper and lower parts is made thicker than the walls of its upper and lower parts, which provides additional strength and reliability when closing the nozzle opening 7, i.e. able to withstand dynamic loads by abruptly pushing the float up and hitting it with the aforementioned hole.

The float 5 is made with the ability to rise when filling the tank with liquid and tightly close the pipe for bleeding gas and with the ability to lower and open the pipe for bleeding gas when the gas pressure is exceeded above a predetermined threshold.

The housing 1, the cover 2 of the housing and the float 5 form a valve for bleeding gas.

When the device does not have any fluid, the float 5 is in a state pressed against the nozzle with a through hole 3 (valve closed).

The mounting pipe with a through hole 3 for the flow of liquid and gas is located opposite the pipe 7 of the ball valve 4, where the float 5 runs between them.

The ball valve 4 is intended for carrying out technological operations, for example, cutting off the drainage and so on.

The union nut 6 is used to connect the device to the pump.

The pump (not shown in the drawing) is perpendicular to the device shown in the drawing, i.e. the pump is horizontal and the valve is vertical.

The device operates as follows.

Before starting up the pump, an automatic bleeding of the gas entering through the through hole 3 through the pipe 7 takes place.

When you turn on the pump, the liquid begins to flow into the cavity of the housing through the pipe with a through hole 3.

At the same time, gas also flows through the pipe with a through hole 3.

When fluid enters the cavity of the housing 1 through the passage opening 3, the float 5 rises to the upper position against the stop by its working surface against the hole of the nozzle 7 of the ball valve 4 under the action of the buoyancy force from the liquid, closing it tightly. This prevents the ingress of liquid into the bleed pipe (not shown) connected to the ball valve 4.

With the further flow of gas through the through-hole 3, the valve remains in the closed position, and gas begins to accumulate in the cavity above the float 5.

With a significant increase in the amount of gas in the fluid entering the valve, the float 5 drops (the working surface of the float 5 moves away from the opening of the nozzle 7) and the gas is vented through the hole of the nozzle 7.

Ball valve 4 is open for unhindered flow of the bleed gas into the bleed line. To carry out technological operations, such as cutting off drainage and so on, it is blocked.

When the pump stops working, the liquid leaves the body through the through-hole 3, and the float 5 returns to the lower position, and the accumulated gas is again vented through the opening of the nozzle 7 into a closed drainage system, to which the pipe for bleeding through the ball valve 4 is connected.

The peculiarity of this design is such that the float 5 does not stick in the upper position due to its design and its implementation from plastic.

Claims (11)

1. A device for automatically bleeding gases on the transfer pumps, comprising a housing with a receiving tank and with a cover and a float, forming a valve for bleeding gas, moreover, the upper part of the receiving tank is connected to the nozzle of the ball valve with an opening at the end for the outlet of the bleed gas, and the lower part of the receiving tank is connected to the mounting pipe with a through hole for the flow of liquid and gas, the float located inside the housing has a two-sided U-shaped cross-sectional shape, the upper part of which is a working surface configured to close the opening of the ball valve nozzle in the operating position of the valve. 2. The device according to claim 1, in which the lower part of the float, made in the form of the letter "P", is larger than the upper one, made in the form of an inverted letter "P". 3. The device according to claim 1, in which the float is made of plastic, cast, streamlined. 4. The device according to claim 1, in which the float is made in the form of a hollow parallelepiped or cube, or cylinder. 5. The device according to claim 1, in which the lower part of the float is made with a maximum transverse size of not less than 1.5-2 times larger than the maximum transverse size of its upper part. 6. The device according to claim 1, in which the transverse partition of the float separating the upper and lower parts has a greater thickness than the wall thicknesses of the upper and lower parts. 7. The device according to claim 1, in which the float is made with the ability to rise when filling the tank with liquid and tightly close the nozzle for venting the gas and with the ability to lower and open the nozzle for venting the gas when the gas pressure exceeds a predetermined threshold. 8. The device according to claim 1, in which the mounting pipe is made with the possibility of connection with a transfer pump. 9. The device according to claim 1, which contains a flare nut for connection to a transfer pump.

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