RU2484236C2 - Cutoff valve - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: cutoff valve consists of a body connected to a pipeline by means of a flange connection, a thread, a quick-detachable connection, a bayonet connection; a seat of the valve in the form of plane, a cone from elastic material or that combined with metal, plastic; a shutoff element in the form of a ball, a plate; a conical or a flattened cylindrical multi-sided prism from material with density that is higher than that of oil or oil products and lower than water density or in combination with light-alloy material; a guide and a cell from metal, elastic plastic or their combination with a thrust against the housing on elastic surface, which is spring-loaded, or their combination. In the tank on the suction line of individual liquid pumping-out pipelines there installed are at least two cutoff valves at different levels. Besides, on individual liquid pumping-out pipelines there installed are liquid pressure sensors, which are electrically connected to a pumping-out control automation system.

EFFECT: improving reliability of separation of two-phase liquids; simplifying the design.

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Description

The invention relates to the field of pipeline valves, in particular to remote monitoring and level control of two-phase liquids (oil, oil products, formation fluid and water), and can find application in commodity parks when separating oil from reservoir fluid, at oil storage facilities, at gas stations and in various industries.

A known liquid level sensor (patent RU No. 2284482 C1, G01F 23/74, publ. 09/27/2006) containing a float with a magnet, stroke limiters of the float and a vertical guide non-magnetic pipe, inside of which there are reed switches. At least one limiter is installed with the possibility of fixing the float in the position of interaction with the reed switch, the guide tube contains an element in the form of a cross-shaped rod, in the grooves of which, with the possibility of separate movement and fixing, reed switches are mounted on it, grouped into functional units, and in the unit with by the number of reed switches more than one, they are connected to each other in a parallel pattern, in the length of the zone of interaction of the float with the reed switch is greater than the distance between the reed switches closest in height. In one embodiment, the groupings of reed switches are installed in height with the possibility of alternating when the float moves the on state of one and two reed switches and providing a zone of interaction of the float simultaneously with two nodes, which is smaller than the zone of interaction with the reed switch, while the reed switches are grouped into at least three functional node, in at least one of which the upper reed switch is installed with the possibility of the float entering the interaction with it at the lower maximum permissible liquid level, and in In another embodiment, the reed switches are installed with the possibility of alternating the on state of n and (n + 1) reed switches, where n is a number from 0 to 3, and the reed switches of the upper node are installed with the possibility of the float entering the interaction with this node at a given nominal level and at least at least one of the reed switches of the lower unit is installed with the possibility of the float coming out of interaction with it at the upper maximum permissible liquid level. Improved objectivity of control and accuracy of regulation of the liquid level.

The disadvantages of the liquid level sensor are the following: the proposed sensor design is intended only for monitoring and regulating the level of a homogeneous liquid, the proposed sensor is not intended for measuring two-phase liquid in one tank.

A known sensor for monitoring the liquid level (patent RU No. 2340878 C1, G01F 23/30, publ. 10.12.2008), containing a sealed housing made in the form of a piece of pipe made of non-magnetic material, the upper and lower flanges located on the ends of the housing and connected between with three studs with nuts, a spherical-shaped float made of non-magnetic material, a permanent magnet made in the form of a ring and located inside a spherical float. The housing of the sensing element (reed switch) is fixed on the outer surface of the sensor housing with screws. The reed switch is located outside the sensor housing. The inlet and outlet tubes welded to the sensor flanges when mounting the sensor on consumer products hermetically connect it to them. EFFECT: proposed sensor design will improve reliability and accuracy of liquid level control.

The disadvantages of the sensor for monitoring the liquid level are: the proposed sensor design is intended only for monitoring and regulating the level of a homogeneous liquid, the proposed sensor is not intended for measuring two-phase liquid in one tank.

The closest in technical solution is the shutoff valve (patent RU No. 2191253 C1, E21B 34/06, publ. 20.10.2002). The shut-off valve is used to shut off tubing during the replacement of the plug-in sucker rod pump when repairing a well without killing it. Provides increased reliability of the valve during the pump change by providing a direct flow of fluid from the well into the pipe and vice versa and reducing flow resistance. The inventive valve is located in the housing and contains a locking element comprising a seat and a ball interacting with the pump follower and having the ability to move along the axis of the housing. According to the invention, the ball is made with an axial hole and two planes parallel to it. They have pins located on one axis perpendicular to the axis of the hole and radially offset from the axis of the ball. The ball with its planes is placed in the groove of the sleeve, which has two curly grooves. Each of them is made in the form of two steps displaced relative to each other by an amount equal to the displacement of the axis of the pins relative to the axis of the hole of the ball. The ball has the ability to rotate around the axis of the pins and contact with the movable seat. The movable seat is made with a spring and contains a latch.

The proposed design of the shut-off valve is used to block the tubing during the replacement of the plug-in sucker rod pump when repairing a well without killing it. This design cannot be used when pumping oil, produced water from reservoirs from commodity parks, where oil is separated from the reservoir fluid.

The objective of the invention is the pumping of individual liquids from a tank containing two phases: oil - reservoir fluid, oil products - water.

This problem was solved by using separate liquids containing oil with produced water and oil products with water when pumping from the tank; installing at least two at different levels on the suction line of the pipelines of the shut-off valves, consisting of a valve body connected to the pipeline by means of a flange connection, a thread, a quick-detachable connection, a bayonet-type connection. Valve seats in the form of a plane, cone made of elastic material or combined with metal, plastic. A locking element in the form of a ball, plate, conical or truncated cylindrical, multifaceted prism from a material with a density higher than the density of petroleum products (oil) and lower than the density of water (for example, polyethylene, a block copolymer of propylene with ethylene, etc. ) or in combination with alloy material. A guide or cage made of metal, elastic plastic, or a combination thereof, with emphasis on the body, on an elastic surface, spring loaded, or combinations thereof. As well as on the pipelines for pumping individual liquids, liquid pressure sensors are installed and are electrically connected to the automation and regulation system for pumping.

The proposed shutoff valve is illustrated by schemes, where:

figure 1 presents a General view of the proposed valve-shutoff when pumping oil (petroleum) from the tank containing the reservoir fluid (water);

figure 2 presents a General view of the proposed valve-shutoff when pumping formation fluid (water) from a tank containing oil (oil products).

The shut-off valve (Fig. 1) for pumping oil (oil products) 5 from a tank containing reservoir fluid (water) 6, mounted on the suction line of the pipeline 7, consists of a housing 1, a saddle 2, a locking unit 3, a cage 4 and a pressure sensor fluid 8, electrically connected with the automation of the pumping control system.

The shut-off valve (figure 2) for pumping formation fluid 6 (water) from a tank containing oil (oil products) 5, mounted on the suction line of the pipeline 9, consists of a housing 1, a saddle 2, a locking unit 3, a cell 4 and a pressure sensor fluid 8, electrically connected with the automation of the pumping control system.

The shut-off valve operates as follows.

The shut-off valves for pumping oil (oil products) (figure 1) are installed on the suction line of the pipeline 7 at a certain height from the base of the tank in an amount of at least two at different heights. When pumping oil (oil) 5 from the reservoir with formation fluid (water) 6, when a certain level of formation fluid (water) 6 of the lower shutoff valve is exceeded, its shut-off assembly 3 pops up and closes the hole in the valve seat 2, blocking the flow of oil (oil products) ) 5 into the suction line of the pipeline 7. In this case, the pressure in the suction line of the pipeline 7 decreases by a certain amount, because oil (oil products) flows through parallel-mounted shut-off valves at different levels 5. The pressure drop on the suction line of the pipeline 7 is detected by a fluid pressure sensor 8, electrically connected to the automation and control system of pumping units, then when the minimum pressure drop on the suction line is exceeded pipeline 7 are switched off pumping units for pumping oil (oil products).

The shut-off valves for pumping formation fluid (water) (figure 2) are installed on the suction line of the pipeline 9 at the lowest height from the base of the tank in an amount of at least two at different heights. When pumping formation fluid (water) 6 from the tank and lowering the level of formation fluid (water) 6 of the upper shutoff valve, its shut-off assembly 3 lowers below and closes the hole in the valve seat 2, blocking the flow of formation fluid (water) 6 into the suction line of the pipeline 9. In this case, the pressure in the suction line of the pipe 9 decreases by a certain amount, because formation fluid (water) 6 flows through parallel-mounted shutoff valves at different levels 6. The pressure drop of the formation fluid (water) 6 on the suction line of the pipeline 9 is detected by a fluid pressure sensor 8, which is electrically connected to the automation and control system for pumping pump units, then when exceeding the minimum value of the pressure drop on the suction line of the pipeline 9 are switched off pumping units for pumping formation fluid (water).

The shut-off valve will allow you to abandon complex devices when pumping formation fluid (water) from oil storage facilities in commodity parks, at gas stations. The shutoff valve will also protect the refueling motor vehicle from water ingress when refueling at gas stations with an underground storage of petroleum products.

The shutoff valve will allow you to abandon complex devices when pumping oil from oil storages in commodity parks during the preparation and transportation of oil.

Claims (1)

Shut-off valve, consisting of a housing attached to the pipeline using a flange connection, thread, quick-release connection, bayonet connection; valve seats in the form of a plane, cone made of elastic material or combined with metal, plastic; a locking element in the form of a ball, plate, conical or truncated cylindrical, multifaceted prism from a material with a density higher than the density of oil or oil products and lower than the density of water or in combination with alloy material; a guide and cells made of metal, elastic plastic, or a combination thereof with an emphasis in the housing on an elastic surface, a spring-loaded surface, or combinations thereof, characterized in that at least two shut-off valves are installed at different levels in the container on the suction line of the pumping pipelines of individual liquids, and Also, liquid pressure sensors are installed on the pipelines for pumping individual liquids and are electrically connected to the automation and regulation system for pumping.

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