Gas-liquid separation pipeline for strong drainage and liquid collection in natural gas extraction
By combining a multi-stage gas-liquid separation structure with a mist eliminator, a cyclone separator, and gravity, the problem of separating light hydrocarbon-containing liquids and natural gas in existing technologies has been solved, thus improving the production efficiency of gas wells.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHENGDU MINGYANG TECHNOLOGY CO LTD
- Filing Date
- 2025-06-19
- Publication Date
- 2026-05-01
AI Technical Summary
Existing technologies are insufficient to effectively separate liquids containing light hydrocarbons from natural gas, which affects the effective production of gas wells.
A gas-liquid separation pipeline combining a mist eliminator, a cyclone separator, and gravity is used to achieve multi-stage gas-liquid separation.
This technology enables the effective separation of liquids containing light hydrocarbons and natural gas, thereby improving the production efficiency of gas wells.
Smart Images
Figure CN224187541U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of natural gas extraction equipment, and in particular relates to a gas-liquid separation pipeline for forced drainage and liquid collection in natural gas extraction. Background Technology
[0002] As gas wells continue to produce and remain in operation for longer periods, the bottomhole pressure decreases, leading to a continuous increase in wells unable to produce due to fluid accumulation in the wellbore, severely impacting effective gas well production. For gas wells with casing pressure below 2 MPa, the main current countermeasure is forced fluid recovery, which involves reducing the transmission pressure and increasing the wellbore pressure differential to promote well resumption of production. During forced fluid recovery using equipment, it is necessary to separate the liquid containing light hydrocarbons from the natural gas. Utility Model Content
[0003] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a gas-liquid separation pipeline for forced drainage and liquid collection in natural gas extraction, which can effectively separate liquid containing light hydrocarbons and natural gas.
[0004] This utility model is achieved through the following technical solution: a gas-liquid separation pipeline for forced drainage and liquid collection in natural gas extraction, comprising:
[0005] A first vertical pipe, wherein a first air outlet, a first air inlet and a first liquid outlet are arranged sequentially from top to bottom on the first vertical pipe, and a first mist eliminator is provided in the pipe body between the first air inlet and the first air outlet on the first vertical pipe;
[0006] The second vertical pipe is provided with a second air inlet, a second air outlet and a second liquid outlet from top to bottom;
[0007] The third vertical pipe has a third air outlet, a third air inlet and a third liquid outlet arranged sequentially from top to bottom. A second mist eliminator is provided in the pipe body between the third air inlet and the third air outlet.
[0008] Drain valves are provided at the first drain port, the second drain port and the third drain port.
[0009] Furthermore, the first drain outlet is located at the bottom of the first vertical pipe, the second drain outlet is located at the bottom of the second vertical pipe, and the third drain outlet is located at the bottom of the third vertical pipe.
[0010] Furthermore, the drain valve is a hydrophobic device.
[0011] Furthermore, the hydrophobic device includes a housing having a first opening at its top and a second opening at its bottom, the first opening being connected to a first drain port, a second drain port, or a third drain port, and a float ball and a sealing valve adapted to the second opening being provided inside the housing, the sealing valve being connected to the bottom of the float ball.
[0012] Furthermore, the sealing valve is a labyrinth seal.
[0013] Furthermore, the gas-liquid separation pipeline also includes a drainage structure, which includes multiple inlets and one outlet. The inlets of the drainage structure are connected to the second opening in the hydrophobic device.
[0014] Furthermore, a first cyclone separator is provided in the connecting pipe between the first air outlet and the second air inlet.
[0015] Furthermore, a second cyclone separator is provided in the connecting pipe between the second air outlet and the third air inlet.
[0016] Furthermore, the outer diameter of the first, second, and third vertical pipes is 150 mm, and the inner diameter of the first, second, and third vertical pipes is 140 mm.
[0017] Compared with the prior art, this utility model has the following advantages and beneficial effects: The gas-liquid separation pipeline in this utility model has a multi-stage gas-liquid separation structure, which adopts a gas-liquid separation structure combining a mist eliminator, a cyclone separator and gravity, and can effectively separate liquids containing light hydrocarbons and natural gas. Attached Figure Description
[0018] The accompanying drawings, which are included to provide a further understanding of the embodiments of the present invention and form part of this application, do not constitute a limitation thereof. In the drawings:
[0019] Fig. 1 This is a schematic diagram of the gas-liquid separation pipeline in this utility model;
[0020] Fig. 2 This is a schematic diagram of the second opening of the hydrophobic device in this utility model when it is sealed.
[0021] Fig. 3 This is a schematic diagram of the second opening of the hydrophobic device in this utility model when it is open;
[0022] In the figure, 1—first vertical pipe, 2—second vertical pipe, 3—third vertical pipe, 4—first mist eliminator, 5—second mist eliminator, 6—drainage device, 61—shell, 62—float, 63—sealing valve. Detailed Implementation
[0023] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.
[0024] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the present invention. To better illustrate the embodiments of the present invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.
[0025] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," "right," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this utility model. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.
[0026] In the description of this utility model, unless otherwise explicitly specified and limited, the term "connection" or similar designation indicating the connection relationship between components should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0027] like Figs. 1 to 3 As shown, this utility model discloses a gas-liquid separation pipeline for forced drainage and liquid collection in natural gas extraction.
[0028] like Fig. 1 As shown, a gas-liquid separation pipeline for forced drainage and liquid collection in natural gas extraction includes a first vertical pipeline 1, a second vertical pipeline 2, and a third vertical pipeline 3.
[0029] The first vertical pipe 1 is provided with a first air outlet, a first air inlet, and a first drain outlet from top to bottom. A first mist eliminator 4 is provided in the pipe body between the first air inlet and the first air outlet of the first vertical pipe 1. For example, the first air inlet and the first air outlet are provided on the side wall of the first vertical pipe 1, the height of the first air outlet is higher than the height of the first air inlet, and the first drain outlet is provided at the bottom of the first vertical pipe 1.
[0030] The second vertical pipe 2 is provided with a second air inlet, a second air outlet, and a second drain outlet from top to bottom. For example, the second vertical pipe 2 has a second air inlet and a second air outlet on its side wall, the height of the second air inlet is higher than the height of the second air outlet, and the bottom of the second vertical pipe 2 has a second drain outlet.
[0031] The third vertical pipe 3 is provided with a third air outlet, a third air inlet, and a third liquid outlet sequentially arranged from top to bottom. A second mist eliminator 5 is installed in the pipe body between the third air inlet and the third air outlet of the third vertical pipe 3. For example, the third air inlet and the third air outlet are provided on the side wall of the third vertical pipe 3, the height of the third air outlet is higher than the height of the third air inlet, and the bottom of the third vertical pipe 3 is provided with a third liquid outlet.
[0032] Drain valves are provided at the first, second, and third drain ports, and these valves are used to control the opening and closing of the corresponding drain ports. Specifically, the drain valve at the first drain port controls the opening and closing of the first drain port, the drain valve at the second drain port controls the opening and closing of the second drain port, and the drain valve at the third drain port controls the opening and closing of the third drain port.
[0033] In this embodiment, the drain valve closes when the liquid volume in the corresponding first vertical pipe 1, second vertical pipe 2, and third vertical pipe 3 is less than or equal to a preset value, and opens when the liquid volume in the corresponding first vertical pipe 1, second vertical pipe 2, and third vertical pipe 3 is greater than the preset value. That is, the first drain port, second drain port, and third drain port are closed when the liquid volume in the corresponding first vertical pipe 1, second vertical pipe 2, and third vertical pipe 3 is less than or equal to the preset value, stopping the outward discharge of liquid, and the first drain port, second drain port, and third drain port are opened to discharge liquid when the liquid volume in the corresponding first vertical pipe 1, second vertical pipe 2, and third vertical pipe 3 is greater than the preset value.
[0034] In this embodiment, the liquid-containing airflow enters the first vertical pipe 1 through the first air inlet. Under the action of gravity, the liquid in the airflow falls and accumulates in the first vertical pipe 1. Because the first drain outlet is sealed, the airflow direction is upward. Under the action of the first mist eliminator 4, the gas and liquid are separated for the first time. Then the airflow enters the second vertical pipe 2. In the second vertical pipe 2, the gas and liquid are separated for the second time under the action of gravity. The airflow then enters the third vertical pipe 3. In the third vertical pipe 3, the gas and liquid are separated for the third time under the action of the second mist eliminator 5.
[0035] In this embodiment, the gas flow undergoes gas-liquid separation in the first vertical pipe 1 through both gravity and the first mist eliminator 4, the gas flow undergoes gas-liquid separation in the second vertical pipe 2 through gravity, and the gas flow undergoes gas-liquid separation in the third vertical pipe 3 through both gravity and the second mist eliminator 5, thereby effectively removing liquid from the natural gas.
[0036] In some embodiments of this example, the first drain outlet is located at the bottom of the first vertical pipe 1, the second drain outlet is located at the bottom of the second vertical pipe 2, and the third drain outlet is located at the bottom of the third vertical pipe 3. The fact that the first, second, and third drain outlets are respectively located at the bottom of the first vertical pipe 1, the second vertical pipe 2, and the third vertical pipe 3 facilitates the complete drainage of liquid from the pipes.
[0037] In some embodiments of this example, the drain valve is a hydrophobic device 6.
[0038] In these embodiments, a hydrophobic device 6 is used to control the drainage, thereby achieving automatic control of the drainage of the first vertical pipe 1, the second vertical pipe 2, and the third vertical pipe 3.
[0039] In some embodiments of this example, the hydrophobic device 6 includes a housing 61, a float 62, and a sealing valve 63. The housing 61 has a first opening at its top and a second opening at its bottom. The first opening is connected to a first drain port, a second drain port, or a third drain port. The housing 61 contains a float 62 and a sealing valve 63 adapted to the second opening. The sealing valve 63 is connected to the bottom of the float 62 and is used to open or seal the second opening under the action of the float 62.
[0040] For example, when the hydrophobic device 6 is located at the first drain outlet, the first opening in the hydrophobic device 6 is connected to the first drain outlet; when the hydrophobic device 6 is located at the second drain outlet, the first opening in the hydrophobic device 6 is connected to the second drain outlet; when the hydrophobic device 6 is located at the third drain outlet, the first opening in the hydrophobic device 6 is connected to the third drain outlet.
[0041] In these embodiments, the first air inlet and the third air outlet of the gas-liquid separation pipeline are both connected to high-pressure pipelines, and the second opening of the hydrophobic device 6 is connected to an atmospheric pressure pipeline; for example Fig. 2 As shown, when there is no liquid accumulation in the hydrophobic device 6 or the liquid volume is less than or equal to a set value, the sealing valve 63 seals the second opening under pressure; for example... Fig. 3As shown, when the liquid volume exceeds the set value, the float 62 rises under buoyancy, causing the sealing valve 63 to rise and opening the second opening, allowing liquid to drain from the condensate drain device 6. For example, when the liquid accumulates in the condensate drain device 6 to more than two-thirds the height of the float 62, the float 62 rises under buoyancy. After the second opening opens, the sealing valve 63 closes the second opening again under the pressure difference between the inside and outside of the condensate drain device 6, and buoyancy opens the second opening again. The condensate drain device 6 achieves pulsed liquid drainage in this manner. When the liquid volume is less than or equal to the set value, the second opening closes, and a small amount of liquid remains in the condensate drain device 6, forming a water seal to prevent natural gas leakage.
[0042] In some embodiments of this example, the sealing valve 63 is a labyrinth seal.
[0043] In some embodiments of this example, a first cyclone separator is provided in the connecting pipe between the first air outlet and the second air inlet.
[0044] In these embodiments, a first cyclone separator is installed in the connecting pipe between the first air outlet and the second air inlet. The first cyclone separator is used to send the airflow in the first vertical pipe 1 into the second vertical pipe 2. During this process, the airflow is rotated to generate centrifugal force. The gas and liquid phases are further separated under the action of centrifugal force and then enter the second vertical pipe 2 so that the gas and liquid are separated under the action of gravity.
[0045] In some embodiments of this example, a second cyclone separator is provided in the connecting pipe between the second air outlet and the third air inlet.
[0046] In these embodiments, a second cyclone separator is installed in the connecting pipe between the second air outlet and the third air inlet. The second cyclone separator is used to send the airflow in the second vertical pipe 2 into the third vertical pipe 3. During this process, the airflow is rotated to generate centrifugal force. The gas and liquid phases are further separated under the action of centrifugal force and then enter the third vertical pipe 3 so that the gas and liquid are separated under the action of gravity.
[0047] In some embodiments of this example, the gas-liquid separation pipeline further includes a drainage structure, which includes multiple inlets and one outlet. The inlets of the drainage structure are connected to the second opening in the hydrophobic device 6.
[0048] For example, the drainage structure has three inlets, and the second openings of the hydrophobic devices 6 at the first, second, and third drainage inlets are connected to the three drainage inlets of the drainage structure in a one-to-one correspondence.
[0049] In these embodiments, the liquid discharged from the first vertical pipe 1, the second vertical pipe 2, and the third vertical pipe 3 is collected in one place and discharged uniformly by setting up a drainage structure.
[0050] In some embodiments of this example, the outer diameter of the first vertical pipe 1, the second vertical pipe 2, and the third vertical pipe 3 is 150 mm, and the inner diameter of the first vertical pipe 1, the second vertical pipe 2, and the third vertical pipe 3 is 140 mm. According to Clause 1.5f of GB150-2011 "Pressure Vessels" (vessels with an inner diameter less than 150 mm) are not within the scope of the GB150 pressure vessel standard. This transforms the original special equipment into conventional equipment, and the separated liquid is discharged into an atmospheric pressure storage tank, thus turning the original pressure vessel into an atmospheric pressure vessel.
[0051] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.
Claims
1. A gas-liquid separation line for natural gas production overflush fluids, characterized by, include: A first vertical pipe, wherein a first air outlet, a first air inlet and a first liquid outlet are arranged sequentially from top to bottom on the first vertical pipe, and a first mist eliminator is provided in the pipe body between the first air inlet and the first air outlet on the first vertical pipe; The second vertical pipe is provided with a second air inlet, a second air outlet and a second liquid outlet from top to bottom; The third vertical pipe has a third air outlet, a third air inlet and a third liquid outlet arranged sequentially from top to bottom. A second mist eliminator is provided in the pipe body between the third air inlet and the third air outlet. Drain valves are provided at the first drain port, the second drain port and the third drain port.
2. A gas-liquid separation line for natural gas production overflush fluid according to claim 1, characterized in that, The first drain outlet is located at the bottom of the first vertical pipe, the second drain outlet is located at the bottom of the second vertical pipe, and the third drain outlet is located at the bottom of the third vertical pipe.
3. A gas-liquid separation line for natural gas production overflush fluid according to claim 2, characterized in that, The drain valve is a hydrophobic device.
4. A gas-liquid separation line for natural gas production overflush fluid according to claim 3, characterized in that, The hydrophobic device includes a housing having a first opening at its top and a second opening at its bottom. The first opening is connected to a first drain port, a second drain port, or a third drain port. The housing contains a float and a sealing valve adapted to the second opening. The sealing valve is connected to the bottom of the float.
5. A gas-liquid separation pipeline for forced drainage and liquid collection in natural gas extraction according to claim 4, characterized in that, The sealing valve is a labyrinth seal.
6. A gas-liquid separation pipeline for forced drainage and liquid collection in natural gas extraction according to claim 4, characterized in that, The gas-liquid separation pipeline also includes a drainage structure, which includes multiple inlets and one outlet. The inlets of the drainage structure are connected to the second opening in the hydrophobic device.
7. A gas-liquid separation pipeline for forced drainage and liquid collection in natural gas extraction according to claim 1, characterized in that, A first cyclone separator is provided in the connecting pipe between the first air outlet and the second air inlet.
8. A gas-liquid separation line for natural gas production overflush fluid according to claim 1, characterized in that, A second cyclone separator is provided in the connecting pipe between the second air outlet and the third air inlet.
9. A gas-liquid separation line for natural gas production overflush fluid according to claim 1, characterized in that, The outer diameter of the first, second, and third vertical pipes is 150 mm, and the inner diameter of the first, second, and third vertical pipes is 140 mm.