CN217540379U - Slug flow catcher - Google Patents

Abstract

A slug flow catcher, comprising a tank body and a gas phase outlet and a liquid phase outlet arranged on the tank body, a liquid steady baffle component and a gas mist catcher installed in the tank body, the slug flow catcher is a horizontal type Structure, that is, the tank body is placed horizontally; the slug liquid inlet is installed on one side of the tank body, and the energy dissipation pipe is installed through the same center line of the tank body and the slug liquid inlet, and the end outlet of the energy dissipation pipe extends to At the inner wall of the head on the other side of the tank body; the energy dissipation pipe is formed by the first-stage expansion pipe at the beginning, the second-level expansion pipe at the middle and rear part, and the end half-pipe pipe at the tail end part in turn detachably connected head to tail; The first-stage expansion pipe is expanded to 1.25 times the diameter of the slug fluid inlet. The utility model has simple structure, sufficient space for gas-liquid separation, stable internal gas-liquid flow field, can effectively promote gas-liquid separation and slug flow capture, solve the influence of slug flow of mixed pipelines on downstream facilities, and ensure production Smooth and safe operation.

Description

A slug flow catcher

technical field

The utility model relates to a processing device for slug flow of an oil and gas mixed transportation pipeline, which is suitable for capturing and eliminating the slug flow in the middle of the ground gathering and transportation of oil and gas fields.

Background technique

With the development of marine, onshore oil and gas fields and large condensate gas fields, multiphase flow mixing technology has been continuously developed. In the process of multiphase flow mixing, long-distance transportation and pipeline turning shear usually produce slug flow; in the development process of oil and gas fields, slug flow will also occur due to the operation and maintenance of oil wells. Serious slug flow will cause a series of problems such as hydraulic shock, liquid level fluctuation and blockage at the oil and gas separation equipment at the end of the pipeline and subsequent process facilities, making it difficult for the downstream process facilities to operate normally.

Chinese patent 201710543940.9 discloses a finger-shaped slug flow dissipating and separating device. The device continuously reduces the velocity and momentum of the fluid by setting a shunt pipe and a finger-shaped branch pipe, and at the same time dissipates the energy of the slug, and finally separates the The gas-liquid two phases are sent to the downstream facilities through the gas-collecting and liquid-collecting manifolds respectively. The device has a large footprint and lacks structural components to effectively handle slug flow.

Chinese Patent No. 201620777487.9 discloses a slug flow catcher with swirling flow, the device is designed to feed tangentially, a swirl cylinder is installed in a vertical structure, and a TP assembly with radial channels is installed in the upper space. The gas-liquid separation space inside the equipment is limited, and the processing capacity and the final gas-liquid separation effect are limited.

Chinese patent ZL.201810786014.9 is a slug flow catcher developed according to the mechanism and characteristics of slug flow. The function of the slug flow catcher is mainly to absorb energy and trap liquid plugs. However, the screw distributor in the slug flow trap has serious overflow and the gas-liquid coalescing internals have the problems of uneven liquid flow distribution.

Utility model content

The utility model provides a slug flow catcher, which has a stable internal gas-liquid flow field, can effectively promote gas-liquid separation and slug flow capture, solves the influence of slug flow of mixed pipelines on downstream facilities, and ensures Production runs smoothly and safely.

In order to achieve the above purpose, the technical scheme adopted by the present utility model is:

A slug flow catcher, comprising a tank body and a gas phase outlet and a liquid phase outlet arranged on the tank body, a liquid stable baffle assembly and a gas mist catcher installed in the tank body, the slug flow catcher is a horizontal type Structure, that is, the tank body is placed horizontally; the slug liquid inlet is installed on one side of the tank body, and the energy dissipation pipe is installed through the same center line of the tank body and the slug liquid inlet, and the end outlet of the energy dissipation pipe extends to At the inner wall of the head on the other side of the tank body; the energy dissipation pipe is formed by the first-level expansion pipe at the beginning, the second-level expansion pipe at the middle and rear, and the end half-pipe at the tail end. The first-stage expansion pipe is expanded to 1.25 times the diameter of the slug liquid inlet, and the pipeline length of the first-stage expansion pipe is 2/3 of the length of the tank body; the pipeline length of the second-stage expansion pipe 10 is 1/3 of the tank body length. .

The first-stage expansion pipe is a first-level eccentric expansion pipe composed of a first-level eccentric head and a first-level expansion pipeline; a curved energy dissipator is installed in the first-level expansion pipeline, and the first curved energy dissipator is installed in the first-level eccentric expansion pipe. The second curved energy dissipator is located at 1/3 of the first-stage expanding pipeline; the second curved energy dissipator is located at 4/5 of the first-stage expanding pipeline;

The curved surface of the first curved energy dissipator is a clockwise curved surface, and the curved surface of the second curved energy dissipator is a counterclockwise curved surface.

The secondary expansion pipe is a secondary eccentric expansion pipe composed of a secondary eccentric head and a secondary expansion pipe; the diameter of the secondary expansion pipe is 1.25 times that of the primary expansion pipe; A steady flow energy dissipator is installed on the pipeline of the pipeline, and the steady flow energy dissipator is located at 1/3 of the secondary expansion pipeline.

The steady flow energy dissipator is composed of several blades that rotate around the center point of the secondary expansion pipe, and the blades are arranged at 30-45° with the axis of the secondary expansion pipe.

The end half-pipe of the energy-dissipating pipe starts at 2/3 of the secondary expansion pipe until the end of the energy-dissipating pipe; the end half-pipe ends at a distance of 100 mm from the inner wall of the head.

An anti-shock baffle is arranged on the wall of the tank body head facing the pipe fluid outlet of the half pipe at the end of the energy dissipation pipe.

The front end energy dissipating pipe at the beginning of the half-pipe pipeline is provided with a liquid deflector, the upper edge of the liquid deflector is flush with the horizontal centerline of the energy dissipating pipe, and the lower edge of the liquid deflector is flush with the low liquid level in the tank. The two sides of the liquid deflector are fixedly connected with the inner wall of the tank.

The liquid steady baffle assembly includes a liquid steady flow plate and a liquid baffle plate arranged in sequence along the fluid flow direction; the upper edge of the liquid steady flow plate is flush with the center line of the energy dissipation pipe in the vertical direction, and the liquid steady flow plate is A liquid channel is formed between the bottom edge of the liquid baffle and the tank body; the upper edge of the liquid baffle is located between the upper edge and the bottom edge of the liquid baffle in the vertical direction, and the bottom of the liquid baffle is connected to the tank body. Bottom connection.

The gas mist catcher is arranged in the gas phase space in the equipment and is close to the gas phase outlet; the gas phase outlet and the liquid phase outlet are respectively installed on the upper and lower parts of the tank body close to the inlet end of the slug liquid; the gas phase outlet is installed with a gas guide A liquid vortex breaker is installed at the liquid phase outlet.

In the utility model, the slug liquid enters the energy dissipating pipe in the slug flow catcher through the slug liquid inlet, and the flow velocity is slowed down in the primary expansion pipe of the energy dissipation pipe. The slug liquid in the pipeline does not change the flow direction and gradually flows steadily and tends to the continuous phase. The slug liquid passes through the first curved energy dissipator in the energy dissipating tube to dissipate energy, and the fluid flow state changes from axial flow to clockwise spiral flow; the fluid passes through the second curved energy dissipator, and the fluid changes from the original The clockwise axial flow energy dissipation of , becomes the counterclockwise axial flow energy dissipation. The change in fluid direction is an energy dissipation process. The fluid after energy dissipation enters the secondary eccentric expansion pipe in the energy dissipation pipe and continues to slow down the flow rate, and the eccentric expansion is used again, so that the gas phase in the pipe continues to overflow from the liquid phase, and the slug liquid in the pipe does not change the flow. The direction is gradually steady flow and tends to the continuous phase. It goes through the steady flow energy dissipator for micro-spin energy dissipation, and enters the end half-pipe for initial gas-liquid separation. The separated gas overflows into the gas phase space, and is discharged from the gas phase outlet through the gas mist catcher. The liquid obtained from the gas-liquid separation is guided by the liquid to the bottom of the tank, passes through the space between the liquid steady flow plate and the tank body, and then passes through the liquid baffle plate to complete the baffle. After the liquid level of the liquid is stabilized, it is finally discharged from the liquid phase outlet. .

The utility model has simple structure, sufficient space for gas-liquid separation, stable internal gas-liquid flow field, can effectively promote gas-liquid separation and slug flow capture, solve the influence of slug flow of mixed pipelines on downstream facilities, and ensure production Smooth and safe operation.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is the top view schematic diagram of Fig. 1;

3 is a schematic structural diagram of a clockwise curved energy dissipator of the present invention;

4 is a schematic structural diagram of a counterclockwise curved energy dissipator of the present invention;

Fig. 5 is the three-dimensional structure schematic diagram of the steady flow energy dissipator of the present invention;

Fig. 6 is the front view structure schematic diagram of Fig. 5;

Fig. 7 is the structural representation of the eccentric head of the utility model;

In the figure: 1—the slug liquid inlet; 2—the gas phase outlet; 3—the liquid phase outlet; 4—the mist eliminator; Pipeline 6—the first curved energy dissipator; 7—the second curved energy dissipator; 8—energy dissipating pipe; 9—tank body; 10—secondary expansion pipe; 10-1—secondary eccentric size head; Secondary expansion pipe; 11—steady flow energy dissipator; 12—end half pipe; 13—liquid deflector; 14—anti-shock baffle; 15—liquid steady flow plate; 16—liquid baffle; 17 - Gas deflector 18 - Liquid vortex breaker.

Detailed ways

Preferred embodiments of the present invention will be described in more detail below. Although the preferred embodiments of the present invention are described below, it should be understood that the present invention may be embodied in various forms and should not be limited by the embodiments set forth herein.

As shown in Figure 1 and Figure 2, a slug flow catcher includes a gas phase outlet 2 and a liquid phase outlet 3 provided on a tank 9 and the tank body, a liquid stable baffle flow assembly and a gas mist catcher installed in the tank body , the slug flow catcher has a horizontal structure, that is, the tank body 9 is placed horizontally; The energy dissipation pipe 8 is installed through the same horizontal line, and the end outlet of the energy dissipation pipe 8 (the energy dissipation pipe 8 is supported by a pipe bracket installed on the inner wall of the tank) extends to the inner wall of the head on the other side of the tank body 9; the energy dissipation pipe 8 is formed by the first-stage expansion pipe 5 at the beginning, the second-level expansion pipe 10 at the middle and rear part, and the end half-pipe pipe 12 at the tail end in turn connected by bolts; the first-level expansion pipe 5 is expanded to the slug liquid inlet 1.25 times the diameter, and the pipe length of the primary expanded pipe 5 is 2/3 of the length of the tank body; the pipe length of the secondary expanded pipe 10 is 1/3 of the length of the tank body.

In the above, the radial position of the nozzle of the slug liquid inlet 1 should ensure that the bottom of the nozzle is flush with the high operating liquid level in the device.

As shown in FIG. 7 , the first-level pipe expansion 5 is a first-level eccentric pipe expansion composed of a first-level eccentric head 5-1 and a first-level pipe expansion pipe 5-2; the first-level pipe expansion pipe 5-2 is installed in the first-level pipe expansion pipe There are curved energy dissipators, the first curved energy dissipator is installed at 1/3 of the first-stage expanding pipeline; the second curved energy dissipator is located at 4/5 of the first-stage expanding pipeline; the curved energy dissipator is Spiral curved panel, the helix length is 0.5~1 pitch.

The use of one-stage eccentric expansion is beneficial to the overflow of the gas phase in the liquid in the pipeline, so that the slug liquid in the pipeline does not change the flow direction and gradually flows steadily and tends to the continuous phase.

As shown in FIGS. 3 and 4 , the curved surface of the first curved energy dissipator 6 is a clockwise curved surface, and the curved surface of the second curved energy dissipator 7 is a counterclockwise curved surface.

The slug liquid passes through the first curved energy dissipator 6 in the energy dissipating pipe to dissipate energy, and the flow state of the fluid changes from axial flow to clockwise spiral flow; the fluid passes through the second curved energy dissipator 7, and the fluid changes from the original The clockwise axial flow energy dissipation of , becomes the counterclockwise axial flow energy dissipation. The change in fluid direction is an energy dissipation process.

As shown in FIG. 7 , the secondary expansion pipe 10 is a secondary eccentric expansion pipe composed of a secondary eccentric large and small head 10-1 and a secondary expansion pipe 10-2. The diameter of the secondary expansion pipe 10-2 is 1.25 times that of the primary expansion pipe 5-2; a steady flow energy dissipater is installed on the pipeline of the secondary expansion pipe 10-2, and the steady flow energy dissipator is located in the second expansion pipe. 1/3 of the stage expansion pipe 10-2.

As shown in Fig. 5 and Fig. 6 , the steady flow energy dissipator is composed of several blades rotating around the center point of the secondary expansion pipe 10-2, and the blades are arranged at 30~30°C along the axis of the secondary expansion pipe 10-2. 45° arrangement, so that the fluid can be micro-dissipated, so as not to increase the pressure drop, and the rotating blade has the function of shunting and stabilizing the flow.

The fluid after the first-stage eccentric expansion and the energy dissipation of the curved-surface effector enters the second-stage eccentric expansion pipeline in the energy-dissipating tube and continues to slow down the flow velocity. The second-stage eccentric expansion is used to make the gas phase in the pipeline continue to overflow from the liquid phase. The slug liquid in the pipeline does not change the flow direction and gradually flows steadily and tends to the continuous phase. After the steady flow energy dissipator, the micro-rotation energy dissipation is carried out.

The end half pipe 12 of the energy dissipation pipe 8 starts at 2/3 of the pipe of the secondary expansion pipe 10 - 2 until the end of the energy dissipation pipe 8 . The end half pipe ends at a distance of about 100 mm from the tank head.

The slug liquid enters the end half pipe for initial gas-liquid separation. The separated gas overflows into the gas phase space, and is discharged from the gas phase outlet through the gas mist catcher. The liquid obtained from the gas-liquid separation is guided by the liquid to the bottom of the tank, passes through the space between the liquid steady flow plate and the tank body, and then passes through the liquid baffle plate to complete the baffle. After the liquid level of the liquid is stabilized, it is finally discharged from the liquid phase outlet. .

An anti-shock baffle 14 is provided on the wall of the tank head facing the pipe fluid outlet of the end half pipe 12 of the energy dissipation pipe. On the one hand, the anti-collision baffle 14 reduces the momentum carried by the fluid, and on the other hand, prevents the gas and liquid from eroding the casing head.

The front end energy dissipating pipe at the beginning of the half-pipe pipe 12 is provided with a liquid deflector 13, the upper edge of the liquid deflector 13 is flush with the horizontal centerline of the energy dissipating pipe, and the lower edge of the liquid deflector 13 is aligned with the inside of the tank. The low liquid level is flush, and both sides of the liquid deflector 13 are fixedly connected to the inner wall of the tank body 9 . The liquid guide plate 13 can play the role of supporting the energy dissipation pipe while guiding the liquid.

The liquid baffle assembly includes a liquid baffle 15 and a liquid baffle 16 arranged in sequence along the fluid flow direction; the upper edge of the liquid baffle 15 is vertically flush with the centerline of the energy dissipation pipe, and the liquid baffle A liquid channel is formed between the bottom edge of the baffle plate 15 and the tank body; the upper edge of the liquid baffle plate 16 is located between the upper edge and the bottom edge of the liquid baffle plate 15 in the vertical direction, and the liquid baffle plate 16 The bottom of the plate 16 is connected to the bottom of the tank. The liquid stable baffle assembly reduces the kinetic energy carried by the liquid, and the liquid flows stably after turning over the baffle.

The gas mist trap 4 is arranged in the gas phase space in the equipment and is close to the gas phase outlet 2; A gas guide plate 17 is installed, and a liquid vortex breaker 18 is installed at the liquid phase outlet 3 to prevent the gas-liquid outlet from forming a vortex. The gas mist catcher 4 and the liquid vortex breaker 18 are products that are commonly used by children.

In the present invention, the "downstream" refers to the relative arrangement of components with respect to the material flow direction, and the meaning of this term is understood by those skilled in the art.

In the slug flow catcher of the utility model, the slug liquid enters the energy dissipation pipe in the slug flow catcher through the slug liquid inlet, and the flow velocity is slowed down in the first-stage expansion pipeline of the energy dissipation pipe. The gas phase overflows from the liquid phase, and the slug liquid in the pipeline does not change the flow direction and gradually flows steadily and tends to the continuous phase. The slug liquid passes through the first curved energy dissipator in the energy dissipating pipe to dissipate energy, and the fluid flow state changes from axial flow to clockwise spiral flow; the fluid passes through the second curved energy dissipator, and the fluid changes from the original The clockwise axial flow energy dissipation of , becomes the counterclockwise axial flow energy dissipation. The change in fluid direction is an energy dissipation process. After energy dissipation, the fluid enters the secondary expansion pipe in the energy dissipation pipe and continues to slow down the flow velocity. Using eccentric expansion, the gas phase in the pipe continues to overflow from the liquid phase, and the slug liquid in the pipe does not change the flow direction and gradually stabilizes. flow and tend to the continuous phase. It goes through the steady flow energy dissipator for micro-spin energy dissipation, and enters the end half-pipe for initial gas-liquid separation. The separated gas overflows into the gas phase space, and is discharged from the gas phase outlet through the gas mist catcher. The liquid obtained from the gas-liquid separation is guided by the liquid to the bottom of the tank, passes through the space between the liquid steady flow plate and the tank body, and then passes through the liquid baffle plate to complete the baffle. After the liquid level of the liquid is stabilized, it is finally discharged from the liquid phase outlet. .

The utility model has simple structure, sufficient space for gas-liquid separation, stable internal gas-liquid flow field, can effectively promote gas-liquid separation and slug flow capture, solve the influence of slug flow of mixed pipelines on downstream facilities, and ensure production operation. of stability and safety.

Claims (10)

1. A slug flow catcher comprises a tank body, a gas phase outlet and a liquid phase outlet which are arranged on the tank body, and a liquid stable flow baffle component and a gas mist catcher which are arranged in the tank body, and is characterized in that the slug flow catcher is of a horizontal structure, namely the tank body (9) is transversely arranged; a slug liquid inlet (1) is arranged on a seal head at one side of the tank body (9) in a penetrating way, an energy dissipation pipe (8) is arranged in the tank body (9) in a penetrating way on the same central line with the slug liquid inlet (1), and an outlet at the tail end of the energy dissipation pipe (8) extends to the inner wall of the seal head at the other side of the tank body (9); the energy dissipation pipe (8) is formed by sequentially detachably connecting a primary expanded pipe (5) at the starting part, a secondary expanded pipe (10) at the middle and rear part and a tail end half pipe pipeline (12) at the tail end part end to end; the primary pipe expansion is expanded to 1.25 times of the diameter of the slug liquid inlet, and the length of the pipeline of the primary pipe expansion (5) is 2/3 of the length of the tank body; the pipeline length of the secondary expanding pipe (10) is 1/3 of the length of the tank body.

2. The slug flow catcher according to claim 1, characterized in that said primary expanded pipe (5) is a primary eccentric expanded pipe consisting of a primary eccentric reducer (5-1) and a primary expanded pipe (5-2); the first-stage pipe expanding pipeline (5-2) is internally provided with a curved surface energy dissipater, and the first curved surface energy dissipater (6) is arranged at 1/3 part of the first-stage pipe expanding pipeline; the second curved surface energy dissipater (7) is positioned at 4/5 of the first-stage pipe expanding pipeline; the curved surface energy dissipater is a spiral curved surface plate, and the spiral length is 0.5 to 1 screw pitch.

3. A slug flow catcher according to claim 2, wherein the curved surface of said first curved surface dissipator is clockwise curved and the curved surface of said second curved surface dissipator is counter-clockwise curved.

4. The slug flow catcher as claimed in claim 1, characterized in that said secondary expansion pipe (10) is a secondary eccentric expansion pipe consisting of a secondary eccentric reducer (10-1) and a secondary expansion pipe (10-2); the diameter of the secondary pipe expanding pipeline (10-2) is 1.25 times that of the primary pipe expanding pipeline (5-2); and a steady flow energy dissipater is arranged on the pipeline of the secondary pipe expanding pipeline (10-2) and is positioned at 1/3 of the secondary pipe expanding pipeline (10-2).

5. The slug flow catcher according to claim 4, characterized in that the steady flow energy dissipater is composed of a plurality of blades rotating around the center point of the secondary expanded pipe (10-2), and the blades are arranged at an angle of 30-45 ° with the axis of the secondary expanded pipe (10-2).

6. A slug flow trap according to claim 1 characterized in that the terminal half pipe (12) of the energy dissipating pipe (8) starts at 2/3 of the secondary pipe expanding pipe (10-2) up to the terminal end of the energy dissipating pipe (8); the tail end half-pipe pipeline is terminated at the position which is 100mm away from the inner wall of the seal head.

7. The slug flow catcher as claimed in claim 6, characterized in that the tank closure wall facing the pipe fluid outlet of the terminal half pipe (12) of the energy dissipating pipe is provided with an impact damper (14).

8. A slug flow catcher according to any of claims 1-7, characterized in that the front energy dissipating pipe where the end half pipe (12) starts is provided with a liquid guiding plate (13), the upper edge of the liquid guiding plate (13) is level with the horizontal center line of the energy dissipating pipe (8), the lower edge of the liquid guiding plate (13) is level with the low liquid level in the tank, and both sides of the liquid guiding plate (13) are fixed to the inner wall of the tank (9).

9. The slug flow trap according to claim 8 wherein the liquid stabilizing baffle assembly comprises a liquid stabilizing plate (15) and a liquid baffle plate (16) arranged in series along the direction of fluid flow; the upper edge of the liquid flow stabilizing plate (15) is level with the central line of the energy dissipation pipe in the vertical direction, and a liquid channel is formed between the bottom edge of the liquid flow stabilizing plate (15) and the tank body; the upper edge of the liquid baffle plate (16) is positioned between the upper edge and the bottom edge of the liquid flow stabilizing plate (15) in the vertical direction, and the bottom of the liquid baffle plate (16) is connected with the bottom of the tank body.

10. The slug flow trap according to claim 9 wherein the gas mist trap (4) is arranged in the gas phase space inside the device near the gas phase outlet (2); the gas phase outlet (2) and the liquid phase outlet (3) are respectively arranged at the upper part and the lower part of the tank body close to the slug liquid inlet end; a gas guide plate (17) is arranged at the gas phase outlet (2), and a liquid vortex breaker (18) is arranged at the liquid phase outlet (3).

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