RU2644879C1 - Pressure stabilising device in pressure oil line - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: pressure stabilising device in pressure oil line includes cylindrical horizontal and ascending sections of the pressure oil line with two oil discharge pipelines and gas discharge branch pipe, wherein the first oil-discharging pipeline along the flow direction is connected to the end of the horizontal section. The ascending section of the pressure pipeline is made in the form of a cylindrical vessel of 0.5 diameter and 12 m length, inclined to the horizontal section of the pressure oil line at 15°, six transverse diaphragms are rigidly fixed inside the vessel on the horizontal section side of the pressure oil line at a distance of 1 m from each other, transverse diaphragms are equipped with central slotted openings, and each subsequent slot opening of transverse diaphragm is displaced by 60°angle counter clockwise and made with reduction of throughput in liquid flow direction. The vessel inner surface on the horizontal section side of the pressure oil line opposite the transverse diaphragms is coated with a pulsation damper in the form of elastic shell made of expanded polyurethane foam, at that the second one in the flow direction of the oil-discharge pipeline is installed in the vessel after transverse diaphragms, in the upper part inside the vessel there is a drop catcher in the form of a packet of grids for gas separation. A gas shutoff device is mounted on the upper end of cylindrical vessel and made in the form of a tube with 0.3 m diameter and 1.5 m length, and communicating from the top to the gas-discharge branch pipe, at that a float connected to adjustable gate is installed in the gas-discharge branch pipe, above the float there are drop deflectors in the form of cones narrowing from bottom upwards, in the lower part of the pipe there is a drain for draining liquid, when the liquid enters the gas shutoff device the float is lifted up and the control valve closes the gas-discharge branch pipe.

EFFECT: invention makes it possible to increase efficiency and reliability of operation, eliminate failure in pressure oil line operation and reduce pressure pulsation within the device.

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Description

The invention relates to devices for preliminary separation of oil and gas and provides stable pressure stabilization in a pressure oil pipeline.

A device is known that stabilizes pressure in a pressure pipe (AS SU No. 459766, IPC G05D 16/20, published on 02/05/1975 in Bull. No. 5), operating according to the “before” or “after” schemes with a minor discharge of the transported medium, consisting of a pressure pipe, a valve with a hydraulic actuator, throttling devices of the governing body and a system of connecting pipelines, while in order to stabilize the pressure and reduce hydraulic resistance, a valve with a hydraulic actuator controlled by a diaphragm valve, and for the purpose of automatically controlling the valve by creating the necessary pressure differences in the hydraulic drive cavities, it has two synchronous throttle valves and two butterfly valves connected to each other by the stem, while in order to be able to close the valve in case of emergency, the throttle valve stem is connected to anchor of the solenoid emergency electrical protection of the sprinkler.

The disadvantages of this device:

- firstly, the complexity of the design, due to the large number of nodes and parts;

- secondly, low operating efficiency, since the device allows you to dump part of the transported medium from the pressure pipe without separation into fractions, for example, to dump the transported gas from the gas-liquid mixture (GHS) when a gas cap is formed in the pressure pipe;

- thirdly, the low reliability of the design, associated with a high probability of desynchronization of two ring throttles and two throttling valves and, as a consequence, the failure of the device in operation.

The closest in technical essence and the achieved result is a device for preliminary separation of oil and gas (a.s. SU No. 1282864, IPC B01D 19/00, published on January 15, 1987, in Bull. No. 2), including cylindrical horizontal and ascending sections of the pressure pipeline with two oil discharge pipelines and a gas outlet pipe, the first oil pipeline along the stream is connected to the end of the horizontal section, while the device is equipped with a film-cutting ring and a chimney pipe with a beveled inlet installed in the mountains in the horizontal section, respectively, before and after the first oil discharge pipe, and liquid shutoffs installed at the inlet to the subsequent oil removal pipes, the film-cutting ring being installed at an angle of 45-60 ° to the axis of the horizontal section, and the baffle is eccentric with an upward shift.

The disadvantages of this device are:

- firstly, the low efficiency of gas evolution from GHS, which leads to a decrease in the quality of gas sent to the compressor station;

- secondly, low reliability, since the liquid with the pressure increase in the ascending section of the pressure pipeline has the possibility of free entry into the gas outlet pipe with gas, and this creates an emergency situation due to the fact that the liquid enters the gas outlet pipe;

- thirdly, the refusal to operate a pressure oil pipeline due to the blocking of the pressure oil pipeline with gas. This is due to the fact that the operation of the device occurs at unstable pressure in the pressure oil pipeline due to the high gas content in oil, while during the operation of the pressure pipeline the pressure fluctuates between 3.0-4.5 MPa due to the formation of a gas cap inside the pressure oil pipeline, which leads to a shutdown of pumping units at a pressure above 4.0 MPa;

- fourthly, pressure pulsations that occur inside the device during the operation of the pressure pipeline, adversely affect the durability and can lead to failure of the device.

The technical objectives of the invention are to increase the efficiency and reliability of the device, as well as eliminating the failure of the pressure oil pipeline and reducing pressure pulsations inside the device.

The stated technical problems are solved by a device that stabilizes the pressure in the pressure oil pipeline, including cylindrical horizontal and ascending sections of the pressure oil pipeline with two oil discharge pipelines and a gas discharge pipe, with the first oil discharge pipeline along the flow connected to the end of the horizontal section.

What is new is that the ascending section of the pressure pipeline is made in the form of a cylindrical container with a diameter of 0.5 and a length of 12 m, inclined to the horizontal section of the pressure pipeline at an angle of 15 °, and six transverse diaphragms are rigidly fixed at a distance from the side of the horizontal section of the pressure pipeline. 1 m from each other, while the transverse diaphragms are equipped with central slotted holes, and each subsequent slotted hole of the transverse diaphragm is offset 60 ° counterclockwise and made with a decrease in throughput in the direction of fluid flow, and the inner surface of the tank from the side of the horizontal section of the pressure oil pipeline opposite the transverse diaphragms is covered with a pulsation damper in the form of an elastic shell made of foamed polyurethane foam, while the second downstream pipeline is installed in the tank after the transverse diaphragms, In the upper part inside the tank, a droplet eliminator is installed in the form of a packet of grids for gas separation, and at the upper end of the cylinder A gas shut-off device is installed in the tank, made in the form of a pipe with a diameter of 0.3 m and a length of 1.5 m, communicating from below with the tank and from the top with a gas outlet pipe, while inside the pipe there is a float connected to an adjustable gate valve installed in the gas outlet pipe, above the float, droplets are made in the form of cones, tapering from the bottom up, in the lower part of the pipe a drain is made for draining the liquid, and when liquid enters the gas shutoff, the float rises and the adjustable valve cuts off the gas outlet sewing branch pipe.

In FIG. 1 schematically shows the proposed device, which stabilizes the pressure in the pressure oil pipeline.

In FIG. 2 and 3 depict sections A-A and B-B of the proposed device, which stabilizes the pressure in the pressure oil pipeline.

The problem is that in the process of transporting well products through a pressure pipeline, due to the large elevation in the terrain and the presence of gas in the pressure oil pipeline, a gas cap gradually forms at the upper point, which in turn blocks the pipeline and does not allow fluid to pass through ( oil). Pumping units, when the pressure in the pressure oil pipeline exceeds 4.0 MPa, ceases to pump liquid (according to its characteristics), which leads to the accumulation of liquid in the buffer tanks and the further shutdown of wells working for these objects.

To solve this problem, a device is proposed that stabilizes the pressure in a pressure oil pipeline, including cylindrical horizontal 1 and ascending 2 sections of a pressure oil pipeline with two oil discharge pipes 3 and 4 and a gas discharge pipe 5. The first oil discharge pipe 3 is connected to the end of the horizontal section 1 along the stream.

The ascending section 2 of the pressure pipe is made in the form of a cylindrical tank 6 with a diameter of 0.5 and a length of 12 m, inclined to the horizontal section 1 of the pressure pipe at an angle of 15 °. It was experimentally obtained that an angle of inclination of 15 ° is sufficient and optimal for the removal of gas into the exhaust pipe 5, which is released from the liquid (oil) in the tank 6.

Six cross diaphragms 7 ', 7' ', 7' '', 7 '' '', 7 '' '' '', 7 '' '' '' at a distance of a = 1 m apart.

Transverse diaphragms 7 ', 7' ', 7' '', 7 '' '', 7 '' '' '', 7 '' '' '' 'are equipped with central slotted holes 8', 8 '', 8 '' ', 8 '' '', 8 '' '' '', 8 '' '' '' 'with a length of b and a width of s (see Figs. 2 and 3), with each subsequent slit hole of the transverse diaphragm being offset by an angle of 60 ° counterclockwise, which allows you to swirl the flow of liquid (oil) with gas.

In addition, each subsequent slot hole 8 ', 8' ', 8' '', 8 '' '', 8 '' '' ', 8' '' '' '' of the corresponding transverse diaphragm 7 ', 7' ', 7 '' ', 7' '' ', 7' '' '', 7 '' '' '' 'is performed with a decrease in throughput in the direction of fluid flow (oil).

Decrease in throughput of slotted holes 8 ', 8' ', 8' '', 8 '' '', 8 '' '' ', 8' '' '' '' of the corresponding transverse diaphragms 7 ', 7' ', 7' ' ', 7' '' ', 7' '' '', 7 '' '' '' 'is achieved by reducing the cross-sectional areas of the slotted holes 8', 8 '', 8 '' ', 8' '' ', 8 '' '' ', 8' '' '' '', for example, of a rectangular cross-section due to a decrease in width - c with a constant length - b (see Fig. 4), therefore, the cross-sectional areas of the slotted holes 8 ', 8' 'are reduced, 8 '' ', 8' '' ', 8' '' '', 8 '' '' '' '(figure 1 is shown conditionally).

Reducing the throughput allows you to increase the speed of the swirling stream at the exit from the transverse diaphragms 7 ', 7' ', 7' '', 7 '' '', 7 '' '' ', 7' '' '' '', which improves the efficiency gas evolution from oil.

The inner surface of the tank 6 from the side of the horizontal section 1 of the pressure pipeline opposite the transverse diaphragms 7 ', 7' ', 7' '', 7 '' '' ', 7' '' '' ', 7' '' '' '' is covered with a pulsation damper in in the form of an elastic shell 9 made of foamed polyurethane foam.

Polyurethane foam is a product of isocyanate and polyol under the influence of a blowing agent. During foaming, many microcapsules are filled with air over the entire volume of the material.

The made foam polyurethane foam before plastic and other types of rubber has advantages:

- firstly, it has the properties of restoring its shape;

- can be operated in aggressive environments, exposed to oils and oil derivatives;

- thirdly, retains its characteristics when operating in the open air under the influence of sunlight.

The second 4 downstream oil recovery pipeline is installed in the vessel 6 after the transverse diaphragms 7 ', 7' ', 7' '', 7 '' '', 7 '' '' '', 7 '' '' ''.

In the upper part inside the container 6, a drop catcher 10 is installed in the form of a packet of nets, for example, in the form of four-metal nets 11 ', 11' ', 11' '', 11 '' '', with mesh sizes, for example, 0.1-0, 1 mm for the separation of gas released from the oil in the tank behind the transverse diaphragms 7 ', 7' ', 7' '', 7 '' '', 7 '' '' ', 7' '' '' '.

At the upper end of the tank 6, a gas cutoff is installed, made in the form of a pipe 12 with a diameter of d = 0.3 m and a length l = 1.5 m, communicating from below with a capacity of 6 by means of a valve 13, and from above with a gas outlet 5.

Inside the pipe 12 there is a float 14 connected to an adjustable valve 15 installed in the exhaust pipe 5.

Above the float 14 are made drop eliminators in the form of cones 16, tapering from the bottom up, for example, in the amount of 5 pieces.

In the lower part of the pipe 12, an outlet 17 is made for draining the liquid, and when liquid enters the pipe 12, the float 14 rises up and the adjustable valve 15 cuts off the gas outlet pipe 5.

In the first 3 and second 4 along the flow of the oil discharge pipe, the corresponding technological valves 18 and 19 are installed. Also, a technological valve 20 is installed on the horizontal section of the pressure oil pipeline 1.

The device operates as follows.

To start the device in operation, it is necessary to open the technological valves 13, 19 and 20.

GHS from wells (not shown in Fig.) Along the horizontal section 1 of the pressure oil pipeline enters the upstream section 2, made in the form of a tank 6.

In the container 6, the gas-liquid mixture flow passes through the slotted openings 8 ', 8' ', 8' '', 8 '' '', 8 '' '' ', 8' '' '' 'of the corresponding diaphragms 7', 7 '' , 7 '' ', 7' '' ', 7' '' '', 7 '' '' '' ', while the GHS flow is crushed and gas is released from the oil (liquid) due to a sharp narrowing in the transverse diaphragms 7' , 7``, 7 '' ', 7' '' ', 7' '' '' ', 7' '' '' '' and sharp expansion behind the transverse diaphragms 7 ', 7``, 7' '', 7 ' '' ', 7' '' '', 7 '' '' ''.

In addition, each slit hole 11 ', 11' ', 11' '', 11 '' '', 11 '' '' ', 11' '' '' '' of the subsequent transverse diaphragm 10 ', 10' ', 10' '', 10 '' '', 10 '' '' ', 10' '' '' '' is shifted by an angle of 60 (shown in Fig. 3 by an arrow) counterclockwise, which leads to a swirling of the flow 360 ° and more intense the release of gas from a liquid (oil) in comparison with the prototype.

During the operation of the device, between the transverse diaphragms 10 ', 10' ', 10' '', 10 '' '', 10 '' '' ', 10' '' '' ', pressure pulsations occur due to expansion cycles - narrowing, therefore, the elastic shell 9 of the foamed polyurethane foam is compressed, taking on excess pressure, and then, after passing through the front of the shock wave, expands again, thereby taking on all pressure fluctuations in the container 6.

The gas released from the oil rises to the upper part of the tank 6, and the liquid oil from the tank 6 enters the second 4 downstream pipeline and is then transported to a booster pump station.

In the upper part, the gas enters the droplet trap 10, made in the form of four-metal grids 11 ', 11' ', 11' '', 11 '' '', with mesh sizes, 0.1-0.1 mm. Here there is a separation of gas from liquid droplets, carried away in the upper part of the tank 6 together with the gas. Then, separated on metal grids 11 ', 11' ', 11' '', 11 '' '', from the liquid droplet gas through the open gate 13 enters the gas cut-off, made in the form of a pipe 12, where rising upwards passes through the droplets made in the form of five cones 16, tapering from the bottom up, and is discharged through the exhaust pipe 5, from where it is sent to the gas compressor station.

Upon receipt of the spray from the tank 6 together with the gas into the pipe 12, they fall onto the drop eliminators made in the form of five cones 16, tapering from the bottom up, where, breaking on the surface of the cones 16, they flow down.

This design of the droplet eliminator, located directly inside the gas cutter, prevents droplets from dropping into the exhaust pipe 4 and ensures that the spray returns back to the tank 6, which improves the quality of gas purification coming to the compressor station.

The presence in the proposed device of transverse diaphragms, a droplet eliminator and droplet eliminators increase the efficiency of gas evolution from the GHS, which improves the quality of the separation of gas sent through the exhaust pipe to the compressor station and eliminates the re-formation of a gas cap in the pressure oil pipeline.

In the case of oil from the tank 6 into the pipe 12, the float 14 rises, acting on the adjustable plug 15, which has the ability, for example, when retracting the rod (not shown in Fig.) To completely block the passage section of the exhaust pipe 5. Gas pressure drop in the exhaust pipe the pipe 5 indicates the closure of the adjustable gate valve 15. Then close the process gate valves 13, 19 and 20 and drain the oil through the outlet 17 to drain the liquid from the pipe 12. After draining the excess oil from the pipe 12 open the technological s sliders 13, 19 and 20 and resume operation of the device, as described above.

The reliability of the device increases, since with an increase in the pressure of oil in the ascending section of the pressure pipeline, the device has the ability to block the exhaust pipe with a gas cutter and drain excess fluid. This eliminates the emergency situation due to the fact that the liquid enters the exhaust pipe.

The failure in the operation of the pressure oil pipeline is eliminated due to gas shutting off the pressure oil pipeline, the pumping pressure of the liquid in the pressure oil pipeline is stabilized and reduced to 2.0-2.5 MPa, while the gas cap does not form inside the pressure oil pipeline, so the pump units are stopped.

Due to the presence in the device of an elastic shell made of foamed polyurethane foam, which quenches the pressure pulsation that occurs inside the device during the operation of the pressure oil pipeline, the durability of the operation is increased and the failure of the device is eliminated.

A device that stabilizes the pressure in a pressure oil pipeline allows you to:

- increase the efficiency and reliability of the work;

- eliminate the failure of the pressure pipeline;

- reduce pressure pulsation inside the device.

Claims (1)

A device that stabilizes the pressure in a pressure oil pipeline, including cylindrical horizontal and ascending sections of a pressure oil pipeline with two oil discharge pipes and a gas discharge pipe, the first oil discharge pipe being connected upstream of the horizontal section, characterized in that the ascending section of the pressure pipe is made in the form of a cylindrical tank with a diameter of 0.5 and a length of 12 m, inclined to the horizontal section of the pressure pipeline at an angle of 15 °, and inside Six transverse diaphragms at a distance of 1 m from each other are rigidly set on the side of the horizontal section of the pressure oil pipeline, while the transverse diaphragms are equipped with central slotted holes, and each subsequent slotted hole of the transverse diaphragm is shifted by an angle of 60 ° counterclockwise and is performed with reduced throughput in the direction of fluid flow, and the inner surface of the tank from the side of the horizontal section of the pressure pipeline opposite the transverse diaphragms is covered with quench we have pulsations in the form of an elastic shell made of foamed polyurethane foam, while the second downstream oil recovery pipe is installed in the tank after the transverse diaphragms, and in the upper part of the tank there is a droplet trap in the form of a packet of grids for gas separation, and a gas cutter is installed at the upper end of the cylindrical tank made in the form of a pipe with a diameter of 0.3 m and a length of 1.5 m, communicating from below with a container, and above with a gas outlet pipe, while inside the pipe there is a float connected to with a guided valve installed in the gas outlet pipe, drop bumpers are made above the float in the form of cones, tapering from the bottom up, a drain is made in the lower part of the pipe to drain the liquid, and when liquid enters the gas shutoff, the float rises and the adjustable valve cuts off the gas outlet pipe.

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