Gas-liquid separation device, system and method for gas well foam displacement operation

Abstract

The application provides a gas-liquid separation device, system and method for gas well foam displacement operation, which comprises a lower separation pipe arranged horizontally, one end of which is an input end connected with a gas well output pipeline, and an injection port for injecting a defoaming agent is arranged at the input end of the lower separation pipe; an upper separation pipe is parallel to the lower separation pipe and is arranged above the lower separation pipe; wherein a first separation pipe connected with the upper separation pipe is arranged at the input end of the lower separation pipe, and the connection of the first separation pipe on the lower separation pipe is located behind the injection port. Based on the technical scheme of the application, the problem of uneven mixing of the defoaming agent and the produced liquid caused by gas-liquid slug flow is effectively reduced by improving the slug flow effect; and the system has a gas-liquid preliminary separation function, the gas-liquid separation effect of the system is improved, and the problem of liquid carried into the pipeline network caused by poor defoaming effect is reduced.

Description

Technical Field

[0001] This invention relates to the field of gas well drainage and gas production technology, and particularly to a gas-liquid separation device, system and method for gas well drainage operations. Background Technology

[0002] Foam drainage is a common method for draining and producing gas from accumulated liquid in gas wells. During the foam drainage process, the following situations typically occur:

[0003] 1. An unreasonable concentration of the foaming agent leads to unsatisfactory wellbore drainage, excessive wellbore pressure differential, and difficulty in resuming production;

[0004] 2. During the foaming process, the produced liquid exhibits a slug flow effect. The surface foaming agent is added uniformly, but there are problems such as uneven mixing and uneven proportions between the foaming agent and the produced liquid, which leads to defoaming problems.

[0005] Currently, optimization is mainly focused on the physicochemical device for adding defoamer, but this still cannot solve the fundamental problem; the slug flow state at the front of the separator must be improved to better enhance the defoaming effect. Summary of the Invention

[0006] In order to solve the problem that the existing technology fails to improve the slug flow state of the produced fluid, resulting in unsatisfactory defoaming effect, this application proposes a gas-liquid separation device, system and method for gas well foam drainage operation.

[0007] In a first aspect, the present invention provides a gas-liquid separation device for gas well bubble drainage operations, comprising:

[0008] The lower separator pipe is horizontally positioned, with one end connected to the input end of the gas well production pipeline. The input end of the lower separator pipe is equipped with an injection port for adding defoamer.

[0009] The upper separation tube is parallel to the lower separation tube and located above the lower separation tube;

[0010] The lower separation pipe has a first separation pipe connected to the upper separation pipe at its input end, and the connection of the first separation pipe on the lower separation pipe is located after the filling port.

[0011] In one embodiment, the first separation tube is inclined, with the inclination direction being obliquely upward along the flow direction of the gas produced in the lower separation tube.

[0012] In one embodiment, the diameters of both the upper separating pipe and the first separating pipe are smaller than the diameter of the lower separating pipe.

[0013] In one embodiment, the lower separation tube is further provided with at least one separation structure communicating with the upper separation tube, the separation structure including a second separation tube communicating with the lower separation tube and the upper separation tube.

[0014] In one embodiment, the second separation tube is inclined, and its inclination direction is obliquely upward along the flow direction of the gas produced in the lower separation tube.

[0015] In one embodiment, the separation structure further includes a plurality of separation branch pipes extending from the second separation pipe to communicate with the lower separation pipe, the separation branch pipes being located in the region corresponding to the acute angle between the second separation pipe and the lower separation pipe.

[0016] In one embodiment, a third separation pipe is provided at the output end of the lower separation pipe, which is connected to the upper separation pipe. The third separation pipe is inclined, and its inclination direction is obliquely downward along the flow direction of the gas produced in the upper separation pipe.

[0017] In one embodiment, a mixer is provided inside the inlet of the lower separator pipe corresponding to the filling port and inside its outlet.

[0018] Secondly, the present invention provides a gas-liquid separation system for gas well degassing operations, comprising the aforementioned gas-liquid separation device; and

[0019] The main separator has two inlet ports and two outlet ports. The two inlet ports are respectively connected to the output ends of the upper and lower separation pipes of the gas-liquid separation device, and the two outlet ports are respectively connected to the gas export pipeline and the liquid storage tank.

[0020] Thirdly, the present invention proposes a gas-liquid separation method for gas well bubble drainage operations, applied to the above-mentioned separation system, the method comprising the following steps:

[0021] S1. Open the mixer in the lower separation pipe of the gas-liquid separation device, and the mixed fluid produced by the gas well production pipeline enters the lower separation pipe;

[0022] S2. Add defoamer into the lower separation tube through the filling port on the lower separation tube;

[0023] S3. The gas phase in the produced mixed fluid is fed into the main separator through the upper separation pipe of the gas-liquid separator, and the liquid phase is fed into the main separator through the lower separation pipe.

[0024] S4. The main separator further separates the gas phase and the liquid phase respectively;

[0025] S5. The further separated gas and liquid phases are output to the gas export pipeline and the liquid storage tank, respectively.

[0026] The above-mentioned technical features can be combined in various suitable ways or replaced by equivalent technical features, as long as the purpose of the present invention can be achieved.

[0027] The gas-liquid separation device, system, and method for gas well bubble drainage operations provided by this invention have at least the following advantages compared with the prior art:

[0028] (1) The gas-liquid separation device is used to improve the slug flow effect, effectively reducing the problem of uneven mixing of defoamer and product liquid caused by gas-liquid slug flow state, and reducing the amount of defoamer used.

[0029] (2) The gas-liquid separation device has a preliminary gas-liquid separation function, which improves the gas-liquid separation effect of the system and reduces the problem of liquid being carried into the pipeline due to poor defoaming effect.

[0030] (3) The gas-liquid separation device adopts a pipeline type overall, without involving pressure vessels, which has little impact on ground investment and is conducive to promotion and application. Attached Figure Description

[0031] The invention will now be described in more detail with reference to embodiments and the accompanying drawings.

[0032] Figure 1 A schematic diagram of the gas-liquid separation device of the present invention is shown;

[0033] Figure 2 A schematic diagram of the gas-liquid separation system of the present invention is shown.

[0034] In the accompanying drawings, the same parts use the same reference numerals. The drawings are not to scale.

[0035] Figure label:

[0036] 1-Casing, 2-Tubing, 3-Wellhead Christmas Tree, 4-Gas-Liquid Separator, 41-Lower Separator Pipe, 411-Input End, 412-Injection Port, 413-Output End, 414-Mixer, 42-Upper Separator Pipe, 43-First Separator Pipe, 44-Second Separator Pipe, 45-Separation Branch Pipe, 46-Third Separator Pipe, 5-Liquid Phase Output Pipeline, 6-Gas Phase Output Pipeline, 7-Main Separator, 8-Gas External Output Pipeline, 9-Storage Tank. Detailed Implementation

[0037] The invention will now be further described with reference to the accompanying drawings.

[0038] Example 1

[0039] An embodiment of the present invention provides a gas-liquid separation device for gas well bubble drainage operations, comprising:

[0040] The lower separation pipe 41 is horizontally set, with one end being the input end 411 connected to the gas well production pipeline. The input end 411 of the lower separation pipe 41 is provided with an injection port 412 for adding defoamer.

[0041] The upper separation tube 42 is parallel to the lower separation tube 41 and located above the lower separation tube 41;

[0042] The lower separation pipe 41 has a first separation pipe 43 connected to the upper separation pipe 42 at its input end 411. The connection of the first separation pipe 43 to the lower separation pipe 41 is located after the filling port 412.

[0043] Specifically, in existing technologies, when a gas-liquid mixture is output from a gas well production pipeline, a defoamer needs to be added to eliminate foam. However, due to the slugging phenomenon often present in gas-liquid mixtures, the defoamer cannot mix well with the liquid phase, resulting in poor defoaming performance. Conventional methods require increasing the amount of defoamer added to compensate for uneven mixing and ensure effective defoaming. This increased defoamer dosage not only raises production costs but also leads to excessively high defoamer content in the produced fluid, burdening the wastewater treatment process.

[0044] The gas-liquid separation device 4 proposed in this invention is mainly used for pre-separation of gas-liquid mixtures, reducing the separation burden on the subsequent main separator 7 and improving slug flow phenomena, thereby enhancing the mixing effect of the defoamer. (See attached figure) Figure 1 As shown, the gas-liquid separation device 4 in this embodiment mainly includes an upper separation pipe 42 and a lower separation pipe 41 arranged in parallel. The input end 411 of the lower separation pipe 41 is connected to the gas well production pipeline, and the gas-liquid mixture produced by the gas well enters the gas-liquid separation device 4 through the lower separation pipe 41. When the gas-liquid mixture enters the lower separation pipe 41, an antifoaming agent is added to the gas-liquid mixture through the injection port 412 of the input end 411 of the lower separation pipe 41. At this time, there is a slug flow phenomenon in the gas-liquid mixture, and the mixing effect of the antifoaming agent is not ideal. Immediately afterwards, the gas-liquid mixture flows through the injection port 412 and reaches the first separation pipe 43. Since the gas phase in the gas-liquid mixture is lighter and the liquid phase is heavier, the gas phase enters the upper separation pipe 42 upward through the first separation pipe 43, thus greatly improving the slug flow phenomenon in the gas-liquid mixture. At the same time, the gas phase and liquid phase are pre-separated in the gas-liquid mixture, which can enhance the final separation effect of the gas-liquid mixture.

[0045] It should be noted that there may be some residual gas in the lower separation tube 41, but this residual gas is not enough to form a slug flow or gas lock. The liquid phase in the lower separation tube 41 can basically be continuous as a whole, which improves the mixing effect of the defoamer.

[0046] Furthermore, it is necessary to control the total flow rate of the gas-liquid mixture entering the gas-liquid separator 4, ensuring that the gas-liquid mixture does not completely fill the lower separation pipe 41 and the upper separation pipe 42, and that the upper separation pipe 42 provides a separate flow space for the gas phase after gas-liquid separation. Preferably, the total flow rate of the gas-liquid mixture is controlled so that the separated liquid phase only fills the lower separation pipe 41.

[0047] Preferably, the first separation pipe 43 is inclined, and its inclination direction is obliquely upward along the flow direction of the gas produced in the lower separation pipe 41.

[0048] Specifically, since the gas-liquid mixture has a certain flow velocity, in order to improve the separation effect of the gas-liquid mixture at the first separation tube 43, it is necessary to guide the gas. Therefore, the first separation tube 43 is inclined upward along the flow direction of the gas produced in the lower separation tube 41, which serves to guide the gas into the upper separation tube 42.

[0049] Preferably, the diameters of the upper separation pipe 42 and the first separation pipe 43 are both smaller than the diameter of the lower separation pipe 41.

[0050] Specifically, when the gas-liquid mixture enters the lower separation pipe 41 and the upper separation pipe 42 respectively, the overall flow velocity of the fluid decreases due to the increase in the flow area. In order to further ensure the reduction of the fluid velocity in the lower separation pipe 41, it is necessary to ensure that the diameter of the lower separation pipe 41 is larger than the diameter of the upper separation pipe 42 and the first separation pipe 43. This reduction in flow velocity is conducive to the full mixing of the liquid phase and the defoamer.

[0051] Furthermore, a third separation pipe 46 connected to the upper separation pipe 42 is provided at the output end 413 of the lower separation pipe 41. The third separation pipe 46 is inclined, and its inclination direction is obliquely downward along the flow direction of the gas produced in the upper separation pipe 41.

[0052] Specifically, as shown in the attached diagram. Figure 1 As shown, when the gas phase enters the upper separation tube 42, it inevitably carries some liquid phase. Consequently, the liquid phase entering the upper separation tube 42 will flow in the lower part of the upper separation tube 42 under the action of gravity. Therefore, a third separation tube 46 is provided to reintroduce the liquid phase entering the upper separation tube 42 into the lower separation tube 41 to ensure the gas-liquid separation effect.

[0053] Furthermore, its inclined setting follows the same principle as the first separation tube 43, namely, it is used to guide the liquid phase in the upper separation tube 42 into the lower separation tube 41.

[0054] Furthermore, a mixer 414 is provided inside the input end 411 of the lower separator 41, corresponding to the filling port 412, and inside the output end 413.

[0055] Specifically, as shown in the attached diagram. Figure 1As shown, mixer 414 is used to further and fully mix the liquid phase of the gas-liquid mixture with the defoamer.

[0056] Example 2

[0057] An embodiment of the present invention provides a gas-liquid separation device for gas well bubble drainage operations, comprising:

[0058] The lower separation pipe 41 is horizontally set, with one end being the input end 411 connected to the gas well production pipeline. The input end 411 of the lower separation pipe 41 is provided with an injection port 412 for adding defoamer.

[0059] The upper separation tube 42 is parallel to the lower separation tube 41 and located above the lower separation tube 41;

[0060] The lower separation pipe 41 has a first separation pipe 43 connected to the upper separation pipe 42 at its input end 411. The connection of the first separation pipe 43 to the lower separation pipe 41 is located after the filling port 412.

[0061] Specifically, in existing technologies, when a gas-liquid mixture is output from a gas well production pipeline, a defoamer needs to be added to eliminate foam. However, due to the slugging phenomenon often present in gas-liquid mixtures, the defoamer cannot mix well with the liquid phase, resulting in poor defoaming performance. Conventional methods require increasing the amount of defoamer added to compensate for uneven mixing and ensure effective defoaming. This increased defoamer dosage not only raises production costs but also leads to excessively high defoamer content in the produced fluid, burdening the wastewater treatment process.

[0062] The gas-liquid separation device 4 proposed in this invention is mainly used for pre-separation of gas-liquid mixtures, reducing the separation burden on the subsequent main separator 7 and improving slug flow phenomena, thereby enhancing the mixing effect of the defoamer. (See attached figure) Figure 1 As shown, the gas-liquid separation device 4 in this embodiment mainly includes an upper separation pipe 42 and a lower separation pipe 41 arranged in parallel. The input end 411 of the lower separation pipe 41 is connected to the gas well production pipeline, and the gas-liquid mixture produced by the gas well enters the gas-liquid separation device 4 through the lower separation pipe 41. When the gas-liquid mixture enters the lower separation pipe 41, an antifoaming agent is added to the gas-liquid mixture through the injection port 412 of the input end 411 of the lower separation pipe 41. At this time, there is a slug flow phenomenon in the gas-liquid mixture, and the mixing effect of the antifoaming agent is not ideal. Immediately afterwards, the gas-liquid mixture flows through the injection port 412 and reaches the first separation pipe 43. Since the gas phase in the gas-liquid mixture is lighter and the liquid phase is heavier, the gas phase enters the upper separation pipe 42 upward through the first separation pipe 43, thus greatly improving the slug flow phenomenon in the gas-liquid mixture. At the same time, the gas phase and liquid phase are pre-separated in the gas-liquid mixture, which can enhance the final separation effect of the gas-liquid mixture.

[0063] It should be noted that there may be some residual gas in the lower separation tube 41, but this residual gas is not enough to form a slug flow or gas lock. The liquid phase in the lower separation tube 41 can basically be continuous as a whole, which improves the mixing effect of the defoamer.

[0064] Furthermore, it is necessary to control the total flow rate of the gas-liquid mixture entering the gas-liquid separator 4, ensuring that the gas-liquid mixture does not completely fill the lower separation pipe 41 and the upper separation pipe 42, and that the upper separation pipe 42 provides a separate flow space for the gas phase after gas-liquid separation. Preferably, the total flow rate of the gas-liquid mixture is controlled so that the separated liquid phase only fills the lower separation pipe 41.

[0065] Preferably, the first separation pipe 43 is inclined, and its inclination direction is obliquely upward along the flow direction of the gas produced in the lower separation pipe 41.

[0066] Specifically, since the gas-liquid mixture has a certain flow velocity, in order to improve the separation effect of the gas-liquid mixture at the first separation tube 43, it is necessary to guide the gas. Therefore, the first separation tube 43 is inclined upward along the flow direction of the gas produced in the lower separation tube 41, which serves to guide the gas into the upper separation tube 42.

[0067] Preferably, the diameters of the upper separation pipe 42 and the first separation pipe 43 are both smaller than the diameter of the lower separation pipe 41.

[0068] Specifically, when the gas-liquid mixture enters the lower separation pipe 41 and the upper separation pipe 42 respectively, the overall flow velocity of the fluid decreases due to the increase in the flow area. In order to further ensure the reduction of the fluid velocity in the lower separation pipe 41, it is necessary to ensure that the diameter of the lower separation pipe 41 is larger than the diameter of the upper separation pipe 42 and the first separation pipe 43. This reduction in flow velocity is conducive to the full mixing of the liquid phase and the defoamer.

[0069] Furthermore, a third separation pipe 46 connected to the upper separation pipe 42 is provided at the output end 413 of the lower separation pipe 41. The third separation pipe 46 is inclined, and its inclination direction is obliquely downward along the flow direction of the gas produced in the upper separation pipe 41.

[0070] Specifically, as shown in the attached diagram. Figure 1 As shown, when the gas phase enters the upper separation tube 42, it inevitably carries some liquid phase. Consequently, the liquid phase entering the upper separation tube 42 will flow in the lower part of the upper separation tube 42 under the action of gravity. Therefore, a third separation tube 46 is provided to reintroduce the liquid phase entering the upper separation tube 42 into the lower separation tube 41 to ensure the gas-liquid separation effect.

[0071] Furthermore, its inclined setting follows the same principle as the first separation tube 43, namely, it is used to guide the liquid phase in the upper separation tube 42 into the lower separation tube 41.

[0072] Furthermore, a mixer 414 is provided inside the input end 411 of the lower separator 41, corresponding to the filling port 412, and inside the output end 413.

[0073] Specifically, as shown in the attached diagram. Figure 1 As shown, mixer 414 is used to further and fully mix the liquid phase of the gas-liquid mixture with the defoamer.

[0074] Furthermore, the lower separation pipe 41 is also provided with at least one separation structure that connects to the upper separation pipe 42. The separation structure includes a second separation pipe 44 that connects the lower separation pipe 41 and the upper separation pipe 42. The second separation pipe 44 is inclined, and its inclination direction is obliquely upward along the flow direction of the gas produced in the lower separation pipe 41.

[0075] Specifically, as shown in the attached diagram. Figure 1 As shown, the second separation tube 44 is used to further separate the gas phase in the mixed fluid based on the technology of the first separation tube 43. Its principle is the same as that of the first separation tube 43, which is based on the fact that the gas phase in the gas-liquid mixture is lighter and the liquid phase is heavier, and the gas will spontaneously flow upward. Therefore, by setting up the second separation tube 44, the gas phase can be further directed upward into the upper separation tube 42.

[0076] Furthermore, multiple separation structures can be arranged along the flow direction of the fluid in the lower separation pipe 41. Because the fluid has a certain flow velocity, and the flow area corresponding to a single second separation pipe 44 is limited, the gas phase may not have enough time to completely enter the second separation pipe 44, thus leaving some gas phase residue in the lower separation pipe 41. Therefore, multiple separation structures are arranged, and the multiple second separation pipes 44 can separate the residual gas phase step by step, thereby improving the gas-liquid separation effect. As for the separation structure as a whole, it is also used to further separate the residual gas phase after separation by the first separation pipe 43.

[0077] The second separation tube 44 is also inclined, in the same direction as the first separation tube 43, and serves the same function, namely, guiding the gas into the upper separation tube 42. Furthermore, to improve the gas phase separation effect and increase the gas phase flow area, the diameter of the second separation tube 44 is set to be larger than the diameter of the first separation tube 43; preferably, the diameter of the second separation tube 44 is equal to the diameter of the lower separation tube 41.

[0078] Furthermore, the separation structure also includes multiple separation branch pipes 45 extending from the second separation pipe 44 to the lower separation pipe 41, with the separation branch pipes 45 located in the region corresponding to the acute angle between the second separation pipe 44 and the lower separation pipe 41.

[0079] Specifically, as shown in the attached diagram. Figure 1As shown, the separation structure consists of a second separation pipe 44 and multiple separation branch pipes 45. When the gas phase enters the upper separation pipe 42 through the second separation pipe 44, it may carry some liquid phase with it. Therefore, if the second separation pipe 44 is set at an inclination, this liquid phase will accumulate on the tank wall below the second separation pipe 44 under the influence of gravity. Therefore, by setting separation branch pipes 45 to connect the second separation pipe 44 and the lower separation pipe 41, a return flow path is formed, allowing the liquid phase in the second separation pipe 44 to flow back to the lower separation pipe 41, further improving the overall gas-liquid separation effect.

[0080] Example 3

[0081] Embodiments of the present invention provide a gas-liquid separation system for gas well bubble drainage operations, including the aforementioned gas-liquid separation device 4; and

[0082] The main separator 7 has two inlet ports and two outlet ports. The two inlet ports are respectively connected to the output ends 413 of the upper and lower separation pipes 41 of the gas-liquid separation device 4, and the two outlet ports are respectively connected to the gas export pipeline 8 and the liquid storage tank 9.

[0083] Specifically, as shown in the attached diagram. Figure 2 As shown, the gas-liquid separation system is set up for the gas well. The casing 1 of the gas well is equipped with an oil pipe 2. The top of the oil pipe 2 is connected to the wellhead tree 3. The wellhead tree 3 is connected to the gas-liquid separation device 4 through the gas well production pipeline.

[0084] The gas-liquid separation system mainly includes a gas-liquid separator 4 and a main separator 7. The gas-liquid separator 4 is mainly used to improve the slug flow phenomenon of the mixed fluid and to pre-separate the mixed fluid. The effect of pre-separation is limited. The gas phase and liquid phase after pre-separation must enter the main separator 7 through the gas phase output pipeline 6 and the liquid phase output pipeline 5, respectively, and undergo further separation to ensure the separation effect. After being separated by the main separator 7, the gas phase and liquid phase are output to the gas export pipeline 8 and the liquid storage tank 9 through the two output ports of the main separator 7, respectively.

[0085] Example 4

[0086] An embodiment of the present invention provides a gas-liquid separation method for gas well bubble drainage operations, applied to the above-mentioned separation system, the method comprising the following steps:

[0087] S1. Open the mixer 414 in the lower separation pipe 41 of the gas-liquid separation device 4, and the produced mixed fluid from the gas well production pipeline enters the lower separation pipe 41.

[0088] S2. Add defoamer into the lower separation tube 41 through the injection port 412 on the lower separation tube 41;

[0089] S3. The gas phase in the produced mixed fluid is fed into the main separator 7 via the upper separation pipe 42 of the gas-liquid separator 4, and the liquid phase is fed into the main separator 7 via the lower separation pipe 41.

[0090] S4 and main separator 7 further separate the gas phase and liquid phase respectively;

[0091] S5. The further separated gas and liquid phases are output to the gas export pipeline 8 and the liquid storage tank 9, respectively.

[0092] In the description of this invention, it should be understood that the terms "upper", "lower", "bottom", "top", "front", "rear", "inner", "outer", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention 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, they should not be construed as limitations on this invention.

[0093] While the invention has been described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the invention. Therefore, it should be understood that many modifications can be made to the exemplary embodiments, and other arrangements can be designed without departing from the spirit and scope of the invention as defined by the appended claims. It should be understood that different dependent claims and features described herein can be combined in ways different from those described in the original claims. It is also understood that features described in conjunction with individual embodiments can be used in other described embodiments.

Claims

1. A gas-liquid separation device for gas well bubble drainage operations, characterized in that, include: The lower separator pipe is horizontally positioned, with one end connected to the input end of the gas well production pipeline. The input end of the lower separator pipe is equipped with an injection port for adding defoamer. The upper separation tube is parallel to the lower separation tube and located above the lower separation tube; The lower separation pipe has a first separation pipe connected to the upper separation pipe at its input end, and the connection of the first separation pipe on the lower separation pipe is located after the filling port. The lower separation pipe is also provided with at least one separation structure that connects to the upper separation pipe. The separation structure includes a second separation pipe that connects the lower separation pipe and the upper separation pipe, and a plurality of separation branch pipes that extend from the second separation pipe to the lower separation pipe. The second separation pipe is inclined and its inclination direction is obliquely upward along the flow direction of the gas produced in the lower separation pipe. The separation branch pipe is located in the region corresponding to the acute angle between the second separation pipe and the lower separation pipe.

2. The gas-liquid separation device for gas well drainage operations according to claim 1, characterized in that, The first separation tube is inclined, and its inclination direction is obliquely upward along the flow direction of the gas produced in the lower separation tube.

3. The gas-liquid separation device for gas well drainage operations according to claim 1, characterized in that, The diameters of both the upper separating pipe and the first separating pipe are smaller than the diameter of the lower separating pipe.

4. The gas-liquid separation device for gas well bubble drainage operation according to any one of claims 1 to 3, characterized in that, A third separation pipe is provided at the output end of the lower separation pipe, which is connected to the upper separation pipe. The third separation pipe is inclined, and its inclination direction is downward along the flow direction of the gas produced in the upper separation pipe.

5. The gas-liquid separation device for gas well bubble drainage operation according to any one of claims 1 to 3, characterized in that, A mixer is installed inside the inlet of the lower separator pipe, corresponding to the filling port, and inside the outlet of the lower separator pipe.

6. A gas-liquid separation system for gas well degassing operations, characterized in that, Includes the gas-liquid separation device as described in any one of claims 1 to 5; as well as The main separator has two inlet ports and two outlet ports. The two inlet ports are respectively connected to the output ends of the upper and lower separation pipes of the gas-liquid separation device, and the two outlet ports are respectively connected to the gas export pipeline and the liquid storage tank.

7. A gas-liquid separation method for gas well bubble drainage operations, characterized in that, Applied to the separation system of claim 6, the method includes the following steps: S1. Open the mixer in the lower separation pipe of the gas-liquid separation device, and the mixed fluid produced by the gas well production pipeline enters the lower separation pipe; S2. Add defoamer into the lower separation tube through the filling port on the lower separation tube; S3. The gas phase in the produced mixed fluid is fed into the main separator through the upper separation pipe of the gas-liquid separator, and the liquid phase is fed into the main separator through the lower separation pipe. S4. The main separator further separates the gas phase and the liquid phase respectively; S5. The further separated gas and liquid phases are output to the gas export pipeline and the liquid storage tank, respectively.

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