RU2578686C1 - Your device is preconfigured separation and filtration - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: preliminary separation device comprises filtering and piping connections for inlet and outlet of the gas-liquid mixture of liquid and gas, as well as partitions. Vertical conduit formed in the center is situated an inlet for supplying a mixture to which is attached an inclined pipe, wherein the pipe axis an angle of 30°. Pipeline is divided by partitions into the chamber opposite the nozzle for feeding a mixture of primary separation chamber is bounded by the partitions with holes in the center, is located above the upper wall of the filtering chamber, and a bottom wall is a secondary separation chamber. Before fitting the primary separation chamber in a centrifugal separator installed in a spiral, with closed ends. On top of the second baffle is attached a centrifugal separator in a spiral with open lower end, wherein the second separator to a hole in the pipeline, which is connected with the pipe duct mounted above the groove with a filter arranged on the side surface of the inclined pipe length. Before opening the second separator is fixed deflector separators placed between the second deflector on the lower partition installed swirl spiral type, and above it - a conical confuser. In the nozzle for supplying a mixture of adapter is configured as a truncated irregular prism. In a secondary separation chamber to partition a reflector configured as a crescent-shaped blade fastened between the flat conical ring and disc, and between it and the spout is located defoamer. Filtration chamber before the tube for withdrawing gas separator is a gas with crescent blades, and a filter septum disposed in the conical deflector, wherein in the partitions are made drain holes, which are inserted in the tube length goes beyond the separator, or convergent channel.

EFFECT: technical result of the invention is to increase the separation efficiency gas-water-oil mixture with high gas content while reducing the size design.

2 cl, 7 dwg

Description

The invention relates to the oil and gas industry and can be used for preliminary separation of a gas-liquid mixture in a collection and preparation system for oil and gas wells.

Known tube pre-separation device, including the ascending and horizontal sections of the pipeline, which contains a confuser with a swirl, nozzles for supplying a shared mixture, the removal of liquid and gas [1].

The disadvantages of this device are:

- the presence of heavy fractions in the gas-liquid mixture does not allow it to freely ascend the ascending section of the pipeline, the mixture can fill this section to the level of a horizontal pipe and gas separation will become minimal;

- on a horizontal section through the slots behind the swirl, the gas together with the gas-oil mixture can go into the drain pipe.

Known tube pre-separation device, adopted as a prototype [2]. The preliminary separation device includes upward and horizontal sections of the pipeline, nozzles for supplying a gas-liquid mixture and the removal of liquid and gas, equipped with nozzles for passing the shared mixture, partitions, forming traps in communication with the nozzles for draining the liquid.

The disadvantages of the device are:

- low separation efficiency due to insufficient separation of free gas in the upstream section;

- if the oil mixture is with heavy fractions, then filling in the ascending section can occur completely to the horizontal section, which will lead to an even greater decrease in separation.

The technical result of the invention is to increase the efficiency of separation of a gas-oil mixture with a high gas content while reducing the size of the structure.

The technical result is achieved in that the pre-separation device, including the pipeline, nozzles for supplying a gas-liquid mixture and the removal of liquid and gas, as well as partitions, is characterized in that the pipe body is made upright, a pipe for supplying the mixture is located in the center of the body, an inclined pipe is connected to the pipe pipe, while the axis of the pipes form an angle of 30 °. The pipeline is divided by partitions into chambers, opposite the nozzle for supplying the mixture there is a primary separation chamber limited by partitions, a filtration chamber is located above the upper partition, and a secondary separation chamber is located under the lower partition, a centrifugal separator in the form of a spiral closed in front of the nozzle is installed, closed with ends, the second centrifugal separator in the form of a spiral with an open bottom end is attached to the upper partition, before the second separator in the pipeline is made about the hole in which the deflector is installed and which is connected by a pipe to the box installed above the groove with a filter made along the length on the side surface of the inclined pipe, a deflector is placed between the separators, a spiral type swirl is installed on the lower partition, and a conical confuser above it, and a nozzle for supplying the mixture also has an adapter made in the form of a truncated irregular prism; a reflector mounted in the form of two flat rings is mounted in the secondary separation chamber on the partition crescent-shaped vanes, and a defoamer is located between it and the drain pipe, a gas separator with crescent-shaped vanes is located in the filtration chamber in front of the gas discharge pipe, and a filter is installed on the partition, while drainage holes are made in the partitions, into which the tubes are inserted with a length going beyond the separator or confuser.

A ball valve can be installed on the pipe connecting the opening of the primary separation chamber to the duct.

The pipeline is vertical, which allows efficient use of centrifugal separators. The flow is thrown into the wall region with twisting in the spiral separator. The stream flows down along the walls of the chamber with subsequent stratification into separate fractions.

An inclined pipe is connected to the pipe for supplying the mixture, while the pipe axes form an angle of 30 °, which ensures the flow of the mixture along the lower part of the inclined pipe, and free gas leaves the box through the groove.

Opposite the nozzle for supplying the mixture is the primary separation chamber, limited by partitions sealed with rubber gaskets.

In the primary separation chamber, a centrifugal separator is installed in the form of a spiral closed from the ends, which ensures the exit of the gas-oil mixture tangentially to the inner surface of the chamber, which makes it possible to additionally isolate the gas component. Closed ends allow you to increase the rate of exit of the mixture from the separator.

The second centrifugal separator in the form of a spiral with an open bottom end further separates the gas separated by the first separator. The open end allows the drip fluid to flow freely.

A hole is made in the pipeline in which a deflector is installed and which is connected by a pipe to a duct installed above the groove with a filter made along the length of the inclined pipe on the side, which allows directing free gas directly to the first separator. The filter acts as an antifoam and partially separates.

A deflector is placed between the separators, which directs the separated gas to the second separator.

The conical confuser collects the oil-water stream with the remaining gas from the primary separation chamber and directs it to a spiral-type swirler, where the stream is leveled and stratified.

The adapter, made in the form of a truncated irregular prism, acts as a deflector, directs the mixture with acceleration.

The filtration chamber increases throughput and allows for a high degree of separation.

The gas separator with crescent-shaped blades directs the gas in a spiral to the chamber walls, provides fine filtration.

An additional filter is installed on the partition in the filtration chamber, while drainage holes are made in the partitions, into which tubes with a length extending beyond the separator or confuser are inserted, which prevents the separated liquid droplets from being trapped by the oncoming gas stream.

A reflector is installed in the secondary separation chamber, made in the form of two flat rings fastened together by crescent-shaped blades that direct the gas flow tangentially to the chamber walls.

The antifoam provides the suppression of the bubbles of the foam mixture.

A ball valve can be installed on the pipe connecting the opening of the primary separation chamber to the duct, which regulates the gas flow, especially in the case of plug operation.

The device for preliminary separation and filtration is illustrated by drawings.

In FIG. 1 presents a device for preliminary separation and filtration, where

pipeline body - 1,

a nozzle for supplying a gas-liquid mixture - 2,

branch pipe for drainage of liquid (drain) - 3,

branch pipe for gas removal - 4,

upper partition - 5,

lower partition - 6,

inclined pipe - 7,

primary separation chamber - 8,

filtration chamber - 9,

secondary separation chamber - 10,

a centrifugal separator in the form of a spiral closed from the ends - 11,

the second centrifugal separator in the form of a spiral - 12,

hole - 13,

deflector - 14,

connecting pipe - 15,

box - 16,

groove with filter - 17,

deflector - 18,

spiral type swirler - 19,

conical confuser - 20

an adapter made in the form of a truncated irregular prism - 21,

reflector - 22,

crescent lobe - 23,

flat ring - 24,

conical disk - 25,

antifoam - 26,

gas separator - 27,

filter - 28,

drainage holes in which the tubes are inserted - 29,

ball valve - 30,

tight cover - 31.

In FIG. 2 shows a section along AA of a preliminary separation and filtration device.

In FIG. 3 shows a section along BB of the preliminary separation and filtration device.

In FIG. 4 shows a section along BB of a preliminary separation and filtration device.

In FIG. 5 shows a section along G-G of the preliminary separation and filtration device.

In FIG. 6 shows a section along the DD of the preliminary separation and filtration device.

In FIG. 7 is a cross-sectional view along the E-E of a preliminary separation and filtration device.

Example

The casing of the pipeline 1 is made of steel 20, the diameter of the pipe is 250 mm, a length of 1600 mm. A nozzle for supplying a gas-liquid mixture 2 is installed in the center of the housing, into which an inclined pipe 7 is inserted at an angle of 30 °, made of steel 20 with a wall thickness of 5 mm, a diameter of 200 mm and a length of one meter 50 mm. On the side surface of the pipe 7, a groove 17 is made with a length of 900 mm and a width of 50 mm, in which a filter is installed in the form of a rectangular frame with three grids welded to it with 10 × 10 mm stainless steel cells, the gap between them is 10 mm. An adapter 21 is inserted into the pipe 2 for supplying a gas-liquid mixture, made in the form of a truncated irregular quadrangular prism from steel 20.

The primary separation chamber 8 is bounded by the upper partition 5 and the lower partition 6. The partitions are made of 18 mm thick X18H10T steel. Three drainage holes 29 with a diameter of 20 mm are made in the upper partition 5 and the lower partition 6, into which stainless steel tubes with a length of at least 200 mm are inserted.

A separator 11 is installed in front of the nozzle 2. The spiral of the separator 11 is made of a flat strip of steel 12X18H10T with a thickness of 1.5 mm, has 5 revolutions, the ends are closed with plates with holes 3 mm thick of steel 12X18H10T.

A second separator 12 is installed on the upper partition 5. The spiral of the separator 12 is wound from a flat tape and has 5 revolutions. The tape is made of steel 12X18H10T with a thickness of 1.5. The upper end of the spiral is welded to the partition 5, and the lower end is open.

In front of the separator 12 in the housing 1, a hole 13 with a diameter of 50 mm was made, in front of the hole 13 on the separator 12 a deflector 14 was fixed, made in the form of a stainless steel plate 3 mm thick and 120 mm wide.

The hole 13 is connected to the duct 16 by a pipe 15. The pipe 15 is made of stainless steel with a diameter of 50 mm. A ball valve 30 is installed on the pipe 15. The box 16 is made of sheet steel 20, 920 mm long, 60 mm wide and 250 mm high. Box 16 is installed above the groove 17.

A second deflector 18 is located between the separators 11 and 12. The deflector 18 is a flat oval-shaped stainless steel plate with bent edges along a larger diagonal. The deflector 18 is mounted on the separator 12. A spiral swirler 19 is installed on the lower partition 6. The swirl 19 is a bar of steel 12X18H10T with a diameter of 6 mm, wound in the form of a conical spiral with a pitch of 25 mm and a height of 200 mm, while in the horizontal plane between adjacent turns a clearance is formed over the diameter of the rod. Above the swirl 19 is a cone-shaped confuser 20 made of stainless steel sheet with a thickness of 2 mm and a height of 120 mm.

The filtration chamber 9 is located above the upper partition 5 and is closed by a sealed cover 31. Opposite the nozzle for gas discharge 4 there is a gas separator 27 with crescent-shaped blades 23. The separator 27 has 8 crescent-shaped blades 23 made of stainless steel.

A filter 28 is installed on the partition 5. The filter 28 is a conical ring filled with metal shavings (in the form of a tangle).

The secondary separation chamber 10 is located between the partition 6 and the drain pipe 3. On the partition 6 in front of the central hole there is a reflector 22. The reflector 22 is eight crescent-shaped blades 23 made of stainless steel and fastened together by a flat ring 24 and a conical disk 25. The hole is flat ring 24 coincides with the hole in the partition 6. Between the pipe 3 and the reflector 22 is an antifoam 26. Defoamer 26 is a hollow cylinder made of stainless steel with a diameter of 240 mm and a height of 30 mm, in which there are three stainless steel nets with a distance of 10 mm between them. The housing 1 is mounted in a rack, fixing its vertical position.

Device pre-separation and filtration works as follows.

In the inclined pipe 7 receives a gas-liquid mixture. The mixture flows along the bottom wall of the pipe 7, and free gas through the groove with the filter 17 enters the box 16 and through the pipe 15 through the open ball valve 30 and the hole 13, deflecting the deflector 14, enters the separator 12. In the separator 12 there is an additional gas purification and through the filter 28, the gas enters the gas separator 23, where the final filtration takes place, and the purified gas exits through the pipe 4.

The oil and gas mixture with gas partially left in it through the pipe 2 with an adapter 20 enters the separator 11, where there is a sharp acceleration of the flow and an increase in centrifugal force. The closed ends of the separator 11 make it possible to increase the rate of exit of the mixture from the separator 11. The flow of the mixture is discarded to the inner wall of the primary separation chamber 8. Rotating in a spiral, the mixture moves along the wall, and under the action of centrifugal and gravitational forces, additional gas is released that rises the deflector 18 is sent to the separator 12. The oil and gas mixture with the remaining gas enters the conical confuser 20, which concentrates the flow and directs it to the spiral swirler 19, which twist AET stream and directs the opening 6. septum mixture stream enters the reflector 22, where by means of the blades the mixture reaches the wall of the secondary separation chamber 10, and a new portion of gas released from the mixture. The evolved gas through the drainage tubes 26 in the partition 6 enters the chamber 10 and, hitting the deflector 18, enters the separator 12, where all the evolved gas, which enters the filtration chamber 9, is combined, and the purified one exits the nozzle 4.

The mixture of oil and water from the chamber 10 enters the defoamer 23, which extinguishes the foam of the mixture, and leaves through the drain pipe 3. The separated liquid in the filtration chamber 9 through the drain pipes 26 enters the drain pipe 3.

The experiment was conducted on an experimental device. A high quality of gas separation up to 99.9% was achieved due to the use of reusable filtration with three types of separators. Moreover, high pressure during the separation process practically does not affect the efficiency of the device with this arrangement of structural elements. Significantly reduced dimensions and weight of the device. The design can be made easily collapsible, for example, to connect the housing 1 and pipe 7, as well as cameras using flanges.

Information sources

1. Patent No. 2292227, IPC B01D 19/00.

2. Patent No. 2232617, IPC B01D 19/00.

Claims (2)

1. A device for preliminary separation and filtration, including a pipeline, nozzles for supplying a gas-liquid mixture and the removal of liquid and gas, as well as partitions, characterized in that the pipeline is vertical, in the center there is a nozzle for supplying a mixture to which an inclined pipe is connected, while the axes of the pipes form an angle of 30 °, the pipeline is divided by partitions into chambers, opposite the nozzle for supplying the mixture there is a primary separation chamber, bounded by partitions with holes in the center, above the upper the filtration chamber is located by the rod, and a secondary separation chamber is located under the lower partition, in front of the nozzle in the primary separation chamber there is a centrifugal separator in the form of a spiral closed from the ends, a second centrifugal separator in the form of a spiral with an open bottom end, is fixed on the upper partition, a hole is made in the pipeline, which is connected by a pipe to a duct installed above the groove with a filter made on the side surface of the inclined pipe in length, in front of the hole on the A deflector is fixed to the rum separator, a second deflector is placed between the separators, a spiral type swirl is installed on the lower partition, and a conical confuser above it, while an adapter made in the form of a truncated irregular prism is located in the nozzle for supplying the mixture, and a secondary separation chamber is installed on the partition a reflector made in the form of crescent-shaped blades fastened between a flat ring and a conical disk, and an antifoam is located between it and the drain pipe, in the filtration chamber before Deck degassing gas separator located with crescent blades, and a filter septum disposed in the cone-shaped deflector, wherein in the partitions are made drain holes, which are inserted in the tube length that goes beyond the separator or converger. 2. The device according to claim 1, characterized in that a ball valve is installed on the pipe connecting the opening of the primary separation chamber to the duct.

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