Prevention and treatment device and method for accumulated liquid of coal bed gas pipeline

Abstract

The invention relates to the technical field of coal bed gas exploitation, and particularly discloses a device and a method for preventing and treating accumulated liquid in a coal bed gas pipeline. A liquid pumping mechanism is mounted at one end of the gas conveying pipeline, an adsorption mechanism is mounted at the other end of the gas conveying pipeline, and a gas-liquid separation mechanism is mounted on one side of the outer wall of the liquid pumping mechanism; through cooperative work of parts such as the liquid condensation cylinder, the water pumping pipe, the driving assembly, the pressure gauge and the adjusting valve, active collection and forced drainage of accumulated liquid in the pipeline are achieved, the accumulated liquid in the pipeline is actively collected through the liquid condensation cylinder, and forced drainage is achieved through the water pumping pipe and the liquid drainage pipe in cooperation with the water pump; the limitation that a traditional condensate cylinder drains liquid depending on pipe network pressure difference is broken through, especially when the pipe network pressure in the middle and later periods of coal bed gas production is extremely low, accumulated liquid can still be efficiently pumped and drained, meanwhile, the solar power generation panel provides stable electric power for the water suction pump, and the problem that a remote well site is not covered by a power grid is solved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of coalbed methane exploitation, and particularly relates to a device and method for preventing and treating liquid accumulation in a coalbed methane pipeline. BACKGROUND

[0002] Coalbed methane exploitation adopts the mode of drainage and pressure reduction, and coalbed methane produced in the exploitation process will carry part of the drainage water, which will then be transported in the form of wet gas in the gas production pipeline. Due to changes in temperature and pressure, free water will be separated out during the pipeline transportation of the coalbed methane, and will accumulate in the pipeline in the form of liquid accumulation, which will easily cause pipe network freezing and plugging and a sharp rise in pipeline pressure, and will seriously affect the single-well coalbed methane production.

[0003] Since the coalbed methane production pipeline is mostly made of non-metallic pipe material, pigging operation cannot be performed. Usually, a condensate cylinder is built at the low point of the pipeline, and the pressure difference between the coalbed methane and the atmosphere is relied on to lift the liquid to achieve the purpose of discharging the liquid accumulation. However, it is found in actual production that, especially in the middle and late stages of coalbed methane production, the pipe network pressure is extremely low, and in some blocks, the pressure can be as low as about 10 KPa, or even close to 0 KPa. Most condensate cylinders cannot collect liquid accumulation or cannot discharge the liquid accumulation due to the low pipe pressure. With the accumulation of liquid accumulation in the pipeline, the pipe network pressure rises, and freezing and plugging become more and more serious. SUMMARY

[0004] The purpose of the present application is to provide a device and method for preventing and treating liquid accumulation in a coalbed methane pipeline to solve the problems raised in the background.

[0005] To achieve the above purpose, the present application provides the following technical scheme:

[0006] A device for preventing and treating liquid accumulation in a coalbed methane pipeline comprises:

[0007] a gas pipeline;

[0008] One end of the gas pipeline is provided with a liquid pumping mechanism, the other end of the gas pipeline is provided with an adsorption mechanism, and the outer wall of the liquid pumping mechanism is provided with a gas-liquid separation mechanism on one side.

[0009] The liquid pumping mechanism comprises a condensate cylinder, a water pumping pipe, a driving assembly, a pressure gauge, a regulating valve and a liquid discharge pipe. The condensate cylinder is installed at one end of the gas pipeline on the outer wall of the upper side. The water pumping pipe is embeddedly installed in the middle of the top end of the condensate cylinder. The driving assembly is installed at the other end of the water pumping pipe to provide driving force for the water pumping pipe to pump liquid accumulation. The pressure gauge and the regulating valve are both arranged on the outer surface of the upper side of the water pumping pipe, and the pressure gauge is located below the regulating valve. The liquid discharge pipe is installed at the other end of the water pumping pump.

[0010] The driving assembly is a water pumping pump.

[0011] Preferably, the pumping mechanism also includes a support frame, a solar power generation panel and an energy storage battery. The support frame is installed at the top of the water pump, the solar power generation panel is installed at the top of the support frame, and the energy storage battery is installed between the upper parts of the inner walls on both sides of the support frame.

[0012] Preferably, a well site pipeline is installed on the upper side of one end of the adsorption mechanism, a first transmission pipe is installed between the liquid pumping mechanism and the gas-liquid separation mechanism, a second transmission pipe is installed at the other end of the gas-liquid separation mechanism, and the second transmission pipe and the first transmission pipe are both installed with a first connecting flange on the side of the outer surface close to the gas-liquid separation mechanism, and a coalbed methane pipeline network is installed at the other end of the second transmission pipe.

[0013] Preferably, the energy storage battery is electrically connected to the solar power generation panel and the water pump, the solar power generation panel is arranged in an inclined structure, and the interior of the condensate cylinder is communicated with the interior of the gas pipeline and the first transmission pipe.

[0014] Preferably, the adsorption mechanism includes a hot air blower, a hot air pipe, an activated carbon separator, an air inlet pipe, an air outlet pipe and a steam exhaust pipe. The hot air pipe is installed at one end of the hot air blower. Two activated carbon separators and two steam exhaust pipes are provided. The two activated carbon separators are respectively installed at the other two ends of the hot air pipe. The air inlet pipe is installed between the upper parts of one end of the two activated carbon separators, the other end of the air inlet pipe is installed at one end of the well site pipeline, the air outlet pipe is installed between the lower parts of the other ends of the two activated carbon separators, and the other end of the air outlet pipe is installed at the other end of the gas transmission pipeline. The two steam exhaust pipes are respectively installed at the middle of the top ends of the two activated carbon separators.

[0015] Preferably, the hot air pipe, the air inlet pipe and the air outlet pipe are all configured as a Y-shaped structure, and solenoid valves are provided on both sides of the outer surfaces of the hot air pipe, the air inlet pipe and the air outlet pipe and on the steam exhaust pipe.

[0016] Preferably, the gas-liquid separation mechanism includes a gas-liquid separation tank, an upper gas-liquid separation plate, a middle gas-liquid separation plate, a vent, a liquid retention plate and a reflux pipe. There are two upper gas-liquid separation plates, and both upper gas-liquid separation plates are installed on the top inner wall of the gas-liquid separation tank. The middle gas-liquid separation plate is installed between the inner walls on both sides of the upper gas-liquid separation plate. There are multiple vents, and the multiple vents are respectively opened at one end of the two upper gas-liquid separation plates and the rear side of one end of the middle gas-liquid separation plate. The liquid retention plate is installed on one side of the bottom inner wall of the gas-liquid separation tank. The reflux pipe is installed in the middle of the bottom end of the gas-liquid separation tank, and the other end of the reflux pipe is installed in the middle of the outer wall of the condensate cylinder.

[0017] Preferably, the gas-liquid separation mechanism further comprises connecting pipes, second connecting flanges, connecting bolts and connecting nuts, the connecting pipes and the second connecting flanges are both provided with two, the two connecting pipes are respectively installed on the lower sides of the two ends of the gas-liquid separation tank, the two second connecting flanges are respectively installed on the outer surfaces of the two connecting pipes away from the gas-liquid separation tank, the connecting bolts and the connecting nuts are both provided with multiple, the multiple connecting bolts are respectively installed on the opposite surfaces of the two second connecting flanges, and the multiple connecting nuts are respectively threadedly installed on the outer surfaces of the multiple connecting bolts.

[0018] Preferably, the outer surface of the reflux pipe is provided with a hydraulic control valve and a one-way valve at the upper part and the lower part respectively, and the reflux pipe is provided in an inclined structure, the upper gas-liquid separation plates, the middle gas-liquid separation plate and the liquid interception plate are all installed in the gas-liquid separation tank in an inclined manner, and the middle gas-liquid separation plate is located between the two upper gas-liquid separation plates.

[0019] A method for preventing and treating liquid accumulation in a coalbed gas pipeline, comprising the following steps:

[0020] Step one, liquid accumulation extraction: first, start the water pump in the liquid extraction mechanism, because the inside of the condensate cylinder is communicated with the inside of the gas pipeline, the liquid accumulation in the pipeline will flow into the condensate cylinder under the action of pressure, and the water pump can extract the liquid accumulation in the condensate cylinder through the water suction pipe, so that the problem that the liquid accumulation cannot be removed due to low pipeline pressure and small pressure difference can be solved;

[0021] Step two, gas-liquid separation: the coalbed gas enters the gas-liquid separation tank through the first conveying pipe, when the coalbed gas passes through the upper gas-liquid separation plate and the middle gas-liquid separation plate, the water in the coalbed gas is separated out due to the decrease of flow rate, the change of flow direction and the gravity settling effect, and the liquid intercepted by the liquid interception plate flows back to the condensate cylinder through the reflux pipe;

[0022] Step three, activated carbon regeneration: start the hot air blower to generate hot air, and control the hot air to be delivered to one activated carbon separator through the electromagnetic valve on the hot air pipe, so that the water in the activated carbon separator can be removed to realize the regeneration function, and the other activated carbon separator continuously processes the coalbed gas, so that the two activated carbon separators can realize the alternating work and the regeneration function;

[0023] Step four, energy supply: the solar power generation panel in the liquid extraction mechanism converts solar energy into electric energy and stores it in the energy storage battery, and the energy storage battery provides power support for the water pump, so that the problem that the condensate cylinder cannot be powered due to its remote location can be solved.

[0024] Compared with the prior art, the present application has the following advantages:

[0025] (1) The application realizes the active collection and forced drainage of the accumulated liquid in the pipeline through the cooperative work of the condensate cylinder, the water suction pipe, the driving assembly, the pressure gauge and the regulating valve, actively collects the accumulated liquid in the pipeline through the condensate cylinder, and realizes the forced drainage through the water suction pump and the drainage pipe, breaks through the limitation of the traditional condensate cylinder relying on the pressure difference of the pipeline network, especially when the pipeline network pressure is extremely low in the middle and late stages of coalbed gas production, the accumulated liquid can still be efficiently pumped and drained, and at the same time, the solar power panel provides stable power for the water pump, solving the problem of no power grid coverage in remote well sites.

[0026] (2) The application realizes the alternate adsorption and regeneration of water in coalbed gas through the cooperative work of the hot air blower, the hot air pipe, the activated carbon separator and the air inlet pipe, two activated carbon separators can work alternately, when one activated carbon separator is saturated, switch to the other activated carbon separator, and at the same time, the saturated activated carbon separator is regenerated by hot air, ensuring that the drying process is uninterrupted, which significantly reduces the water content of coalbed gas and reduces the separation of free water from the source.

[0027] (3) The application prolongs the gas residence time through the cooperative work of the gas-liquid separation tank, the upper gas-liquid separation plate, the middle gas-liquid separation plate, the air hole and the liquid interception plate, and efficiently intercepts liquid droplets by using the principle of gravity settling and flow direction mutation, and the liquid interception plate further prevents liquid from being carried by gas, and cooperates with the reflux pipe with inclined structure to ensure that the liquid quickly returns to the condensate cylinder, which significantly improves the gas-liquid separation efficiency and reduces the risk of pipeline freezing. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 It is a perspective view of the application;

[0029] Figure 2 It is an enlarged view of A in the application; Figure 1

[0030] Figure 3 It is a perspective view of the liquid pumping mechanism of the application;

[0031] Figure 4 It is an enlarged view of B in the application; Figure 3

[0032] Figure 5 It is a perspective view of the adsorption mechanism of the application;

[0033] Figure 6 It is a perspective view of the gas-liquid separation mechanism of the application;

[0034] Figure 7 It is a sectional view of the gas-liquid separation tank of the application;

[0035] ​​Figure: 1, gas pipeline; 2, liquid pumping mechanism; 3, adsorption mechanism; 4, gas-liquid separation mechanism; 5, well site pipeline; 6, first conveying pipe; 7, second conveying pipe; 8, first connecting flange; 9, coalbed methane pipeline network;

[0036] 21, condensate cylinder; 22, water pumping pipe; 23, water pumping pump; 24, pressure gauge; 25, regulating valve; 26, liquid discharge pipe; 27, support frame; 28, solar panel; 29, energy storage battery;

[0037] 31, hot air blower; 32, hot air pipe; 33, activated carbon separator; 34, air inlet pipe; 35, air outlet pipe; 36, steam discharge pipe;

[0038] 41, gas-liquid separation tank; 42, upper gas-liquid separation plate; 43, middle gas-liquid separation plate; 44, air vent; 45, liquid interception plate; 46, return pipe; 47, connecting pipe; 48, second connecting flange; 49, connecting bolt; 410, connecting nut. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0040] Embodiment one:

[0041] Please refer to Figures 1 to 7 Fig. 1 shows a coalbed methane pipeline liquid accumulation prevention device, which comprises:

[0042] The gas pipeline 1;

[0043] One end of the gas pipeline 1 is provided with a liquid pumping mechanism 2, and the other end of the gas pipeline 1 is provided with an adsorption mechanism 3. The outer wall of the liquid pumping mechanism 2 is provided with a gas-liquid separation mechanism 4 on one side.

[0044] The liquid pumping mechanism 2 comprises a condensate cylinder 21, a water pumping pipe 22, a driving assembly, a pressure gauge 24, a regulating valve 25, and a liquid discharge pipe 26. The condensate cylinder 21 is installed at one end of the gas pipeline 1 on the outer wall upper side. The water pumping pipe 22 is embeddedly installed in the middle of the top end of the condensate cylinder 21. The driving assembly is installed at the other end of the water pumping pipe 22, for providing driving force for the water pumping pipe 22 to pump liquid accumulation. The pressure gauge 24 and the regulating valve 25 are both arranged on the outer surface upper side of the water pumping pipe 22, and the pressure gauge 24 is located below the regulating valve 25. The liquid discharge pipe 26 is installed at the other end of the water pumping pump 23.

[0045] The driving assembly is a water pumping pump 23.

[0046] As can be seen from the above, Figures 1 to 4 The liquid pumping mechanism 2 further comprises a support frame 27, a solar panel 28 and an energy storage battery 29, the support frame 27 is installed at the top end of the water pump 23, the solar panel 28 is installed at the top end of the support frame 27, and the energy storage battery 29 is installed between the inner walls of the two sides of the support frame 27.

[0047] The one end of the adsorption mechanism 3 is provided with a well site pipeline 5, the liquid pumping mechanism 2 and the gas-liquid separation mechanism 4 are provided with a first conveying pipe 6, the other end of the gas-liquid separation mechanism 4 is provided with a second conveying pipe 7, the outer surface of the first conveying pipe 6 and the second conveying pipe 7 close to the gas-liquid separation mechanism 4 are provided with a first connecting flange 8, and the other end of the second conveying pipe 7 is provided with a coalbed methane pipeline network 9.

[0048] As can be seen from the above, the coalbed methane is transported through the gas pipeline 1, when the free water carried in the gas is precipitated and accumulated in the low point of the pipeline due to temperature and pressure changes, the liquid is first introduced into the condensate cylinder 21, at this time, the water pump 23 can be started to pump out the liquid in the condensate cylinder 21 through the liquid discharge pipe 26, during the operation of the water pump 23, the pressure gauge 24 displays the pumping pressure in real time, and the regulating valve 25 can adjust the pumping rate according to the pressure change to ensure stable operation of the system, and the pumped liquid is discharged through the liquid discharge pipe 26, which can realize active collection and forced discharge of the liquid in the pipeline, breaking through the limitation of the traditional condensate cylinder 21 relying on the pressure difference of the pipeline network to discharge the liquid, especially when the pipeline network pressure is extremely low in the middle and late stages of coalbed methane production, the liquid can still be efficiently pumped and discharged, avoiding the retention of liquid due to insufficient pressure difference, at the same time, the power of the whole system is provided by the solar panel 28, the solar panel 28 converts solar energy into electrical energy and stores it in the energy storage battery 29, meeting the power demand of the water pump 23, providing stable power, solving the problem of no power grid coverage in remote well sites, facilitating the use of the device in the wild, thereby reducing the operation and maintenance cost and improving the equipment applicability.

[0049] Specifically, referring to Figures 1 to 4 As shown in the figure, the energy storage battery 29 is electrically connected with the solar panel 28 and the water pump 23, the solar panel 28 is arranged in an inclined structure, and the inside of the condensate cylinder 21 is communicated with the inside of the gas pipeline 1 and the first conveying pipe 6.

[0050] As can be seen from the above, the energy storage battery 29 can receive the electrical energy converted by the solar panel 28 and store it, at the same time, providing stable power for the water pump 23, realizing clean energy power supply, solving the problem of insufficient pipeline power in remote areas, reducing the dependence on traditional power grid, the inclined solar panel 28 can optimize the solar energy absorption efficiency and improve the power generation efficiency, ensuring that the liquid is effectively gathered from the pipeline system to the condensate cylinder 21, providing conditions for subsequent pumping and discharging.

[0051] Example two:

[0052] Reference Figure 5 As shown in the figure, the adsorption mechanism 3 includes a hot air blower 31, a hot air pipe 32, two active carbon separators 33, an air inlet pipe 34, an air outlet pipe 35 and two steam discharge pipes 36, the hot air pipe 32 is installed at one end of the hot air blower 31, the two active carbon separators 33 and the two steam discharge pipes 36 are both provided with two, the two active carbon separators 33 are respectively installed at the other two ends of the hot air pipe 32, the air inlet pipe 34 is installed between the upper parts of the two active carbon separators 33 at one end, the other end of the air inlet pipe 34 is installed at one end of the well site pipeline 5, the air outlet pipe 35 is installed between the lower parts of the two active carbon separators 33 at the other end, and the other end of the air outlet pipe 35 is installed at the other end of the gas pipeline 1, the two steam discharge pipes 36 are respectively installed at the middle parts of the top ends of the two active carbon separators 33.

[0053] As can be seen from the above, the coal bed gas enters the active carbon separators 33 through the air inlet pipe 34 from the well site pipeline 5, so that the water in the coal bed gas can be effectively adsorbed before entering the coal bed gas pipeline network 9, realizing the source treatment of liquid accumulation, and the two active carbon separators 33 can work alternately to realize the alternate adsorption and regeneration of water in the coal bed gas, when one active carbon separator 33 is saturated, the electromagnetic valves on one side of the air inlet pipe 34 and the air outlet pipe 35 are opened, and the electromagnetic valves on the other side of the air inlet pipe 34 and the air outlet pipe 35 are closed, so that the coal bed gas can be switched to the other active carbon separator 33 for adsorption and drying, ensuring the continuous and uninterrupted drying process of the coal bed gas, at the same time, the hot air blower 31 generates hot air, the hot air can be input into the saturated active carbon separator 33 through the electromagnetic valve control on the hot air pipe 32, so that the saturated active carbon separator 33 can be regenerated by hot air, and the adsorbed water can be discharged from the steam discharge pipe 36 in the form of steam, this design significantly reduces the water content of the coal bed gas, reduces the separation of free water from the source, avoids the pipe network freezing and pressure fluctuation caused by water accumulation, and ensures the stability of the single well gas production.

[0054] Preferably, as shown in the figure, Figure 5 Preferably, as shown in the figure, the hot air pipe 32, the air inlet pipe 34 and the air outlet pipe 35 are all provided with Y-shaped structures, and the outer surfaces of the hot air pipe 32, the air inlet pipe 34 and the air outlet pipe 35 are provided with electromagnetic valves on both sides, and the steam discharge pipes 36 are also provided with electromagnetic valves.

[0055] As can be seen from the above, the Y-shaped structure of the pipeline can realize the alternate use of the two active carbon separators 33, and the working state of the two active carbon separators 33 can be adjusted by opening and closing the electromagnetic valves, so that the coal bed gas can be continuously and stably dried, and the system can be operated efficiently.

[0056] Example three:

[0057] Preferably, as shown in the figure, Figure 6 and Figure 7As shown, the gas-liquid separation mechanism 4 comprises a gas-liquid separation tank 41, upper gas-liquid separation plates 42, middle gas-liquid separation plates 43, air holes 44, a liquid interception plate 45 and a reflux pipe 46, the upper gas-liquid separation plates 42 are provided with two, and both are installed on the top inner wall of the gas-liquid separation tank 41, the middle gas-liquid separation plates 43 are installed between the two sides of the inner wall of the upper gas-liquid separation plates 42, the air holes 44 are provided with multiple, and each is arranged at one end of the two upper gas-liquid separation plates 42 and the rear side of one end of the middle gas-liquid separation plate 43, the liquid interception plate 45 is installed on one side of the bottom inner wall of the gas-liquid separation tank 41, and the other end of the reflux pipe 46 is installed in the middle of the bottom end of the gas-liquid separation tank 41.

[0058] The gas-liquid separation mechanism 4 further comprises connecting pipes 47, second connecting flanges 48, connecting bolts 49 and connecting nuts 410, the connecting pipes 47 and the second connecting flanges 48 are both provided with two, the two connecting pipes 47 are respectively installed on the lower side of the two ends of the gas-liquid separation tank 41, and the two second connecting flanges 48 are respectively installed on the outer surface of the two connecting pipes 47 away from the gas-liquid separation tank 41, the connecting bolts 49 and the connecting nuts 410 are both provided with multiple, the multiple connecting bolts 49 are respectively installed on the opposite surfaces of the two second connecting flanges 48, and the multiple connecting nuts 410 are respectively threadedly installed on the outer surfaces of the multiple connecting bolts 49.

[0059] As can be seen from the above, through the connecting bolts 49 and the connecting nuts 410, the first connecting flange 8 and the second connecting flange 48 can be installed together, thereby realizing the connection and flow between the two connecting pipes 47 and the first conveying pipe 6 and the second conveying pipe 7, so that the coal bed gas enters the gas-liquid separation tank 41 through the first conveying pipe 6, at this time, the coal bed gas successively hits the two upper gas-liquid separation plates 42 and the middle gas-liquid separation plate 43, the gas continues to flow through the air holes 44 on the plate body, while the large-diameter liquid drops are intercepted and slide along the plate surface, when the gas flows through the middle gas-liquid separation plate 43, the flow rate decreases and the flow direction changes suddenly, causing the small-diameter liquid drops to separate from the gas under the action of gravity, so that the coal bed gas separates the water in it due to the decrease of the flow rate, the sudden change of the flow direction and the gravity settling effect, and the separated liquid is blocked by the liquid interception plate 45 to weaken the ability of the gas to carry the liquid, while the separated liquid flows back to the condensate cylinder 21 through the reflux pipe 46 with the inclined structure, realizing the closed-loop collection of the accumulated liquid, and the hydraulic control valve on the reflux pipe 46 ensures that only liquid passes through, while the one-way valve on the reflux pipe 46 prevents the liquid in the condensate cylinder 21 from flowing back, thereby significantly improving the gas-liquid separation efficiency and reducing the risk of pipe freezing.

[0060] Preferably, referring to Figure 6 andFigure 7 As shown, the outer surface upper portion and the outer surface lower portion of the reflux pipe 46 are respectively provided with a hydraulic control valve and a one-way valve, and the reflux pipe 46 is provided in an inclined structure, the upper gas-liquid separation plate 42, the middle gas-liquid separation plate 43 and the liquid interception plate 45 are all installed in the interior of the gas-liquid separation tank 41 in an inclined manner, and the middle gas-liquid separation plate 43 is located between the two upper gas-liquid separation plates 42.

[0061] As can be seen from the above, the hydraulic control valve ensures that only liquid can flow into the reflux pipe 46, the one-way valve can prevent the liquid in the condensate cylinder 21 from flowing back to the reflux pipe 46, and the inclined structure of the reflux pipe 46 can accelerate the reflux of the liquid to the condensate cylinder 21, prolong the gas residence time through the multi-stage inclined plate structure, separate the liquid droplets by using gravity settling and flow direction mutation, strengthen the gas-liquid separation efficiency, reduce the gas carrying liquid capacity, and improve the liquid accumulation interception effect.

[0062] Example Four:

[0063] Reference Figures 1 to 7 As shown, a method for preventing and treating coalbed methane pipeline liquid accumulation includes the following steps:

[0064] Step one, liquid accumulation extraction: first, turn on the water pump 23 in the liquid extraction mechanism 2, because the interior of the condensate cylinder 21 is communicated with the interior of the gas pipeline 1, the liquid accumulation in the pipeline will flow into the condensate cylinder 21 under the action of pressure, and the water pump 23 can extract the liquid accumulation in the condensate cylinder 21 through the water extraction pipe 22, which can overcome the problem that the liquid accumulation cannot be removed due to low pipeline pressure and small pressure difference;

[0065] Step two, gas-liquid separation: the coalbed methane enters the gas-liquid separation tank 41 through the first conveying pipe 6, when the coalbed methane passes through the upper gas-liquid separation plate 42 and the middle gas-liquid separation plate 43, the water in the coalbed methane is separated out due to the reduction of flow rate, the mutation of flow direction and the action of gravity settling, and the liquid intercepted by the liquid interception plate 45 flows back to the condensate cylinder 21 through the reflux pipe 46;

[0066] Step three, activated carbon regeneration: turn on the hot air blower 31 to generate hot air, and control the hot air to be delivered to one activated carbon separator 33 through the electromagnetic valve on the hot air pipe 32, so as to remove the water in the activated carbon separator 33 to realize the regeneration function, and the other activated carbon separator 33 continuously processes the coalbed methane, so as to realize the alternating work and regeneration function of the two activated carbon separators 33;

[0067] Step four, energy supply: the solar power panel 28 in the liquid extraction mechanism 2 converts solar energy into electric energy and stores it in the energy storage battery 29, and the energy storage battery 29 provides power support for the water pump 23, which can overcome the problem that the condensate cylinder 21 is located in a remote place and cannot provide power.

[0068] Application Example:

[0069] The design is applied to the scene of prevention and treatment of pipeline liquid accumulation in the process of coalbed methane exploitation, especially for the complex environment of extremely low pipe network pressure in the middle and late stage of coalbed methane production, non-metallic pipe material cannot be cleaned, low temperature is easy to freeze and block, and remote no power grid, for example, in the middle and late stage of development of a certain coalbed methane field, the traditional condensate cylinder 21 cannot discharge liquid accumulation due to insufficient pressure difference, and pipeline freezing and blocking occur frequently, the device actively pumps out liquid accumulation through the liquid pumping mechanism 2, continuously dries gas through the adsorption mechanism 3, and cooperates with the gas-liquid separation mechanism 4 to intercept free water, breaks through the low-pressure liquid discharge limit, reduces the water content of coalbed methane to below the standard, reduces the precipitation of free water, avoids low-temperature freezing and blocking of the pipeline, at the same time, the independent power supply system composed of the solar power panel 28 and the energy storage battery 29 provides stable power for the water pump 23, adapts to the field no power grid environment, after application, the freezing and blocking frequency of the pipeline network of the gas field is reduced by 80%, the daily average gas production of a single well is restored to more than 95% of the design value, the energy consumption of the equipment is reduced by 40% compared with the traditional electric drive system, and the technical problem of prevention and treatment of liquid accumulation in low-pressure coalbed methane pipeline is effectively solved.

[0070] Although the embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A device for preventing and controlling liquid accumulation in coalbed methane pipelines, characterized in that: include: Gas pipeline (1); A liquid extraction mechanism (2) is installed at one end of the gas pipeline (1), an adsorption mechanism (3) is installed at the other end of the gas pipeline (1), and a gas-liquid separation mechanism (4) is installed on one side of the outer wall of the liquid extraction mechanism (2); The liquid pumping mechanism (2) comprises a condensate cylinder (21), a water pumping pipe (22), a driving assembly, a pressure gauge (24), a regulating valve (25) and a liquid discharge pipe (26); the upper side of the outer wall of the condensate cylinder (21) is mounted on one end of the gas transmission pipeline (1); the water pumping pipe (22) is embedded in the middle of the top end of the condensate cylinder (21); the driving assembly is mounted on the other end of the water pumping pipe (22) and is used to provide a driving force for the water pumping pipe (22) to extract the accumulated liquid; the pressure gauge (24) and the regulating valve (25) are both arranged on the upper side of the outer surface of the water pumping pipe (22), and the pressure gauge (24) is located on the lower side of the regulating valve (25); and the liquid discharge pipe (26) is mounted on the other end of the water pump (23); The driving component is a water pump (23).

2. The device for preventing and controlling liquid accumulation in a coalbed methane pipeline according to claim 1, characterized in that: The pumping mechanism (2) further comprises a support frame (27), a solar power generation panel (28) and an energy storage battery (29); the support frame (27) is mounted on the top of the water pump (23); the solar power generation panel (28) is mounted on the top of the support frame (27); and the energy storage battery (29) is mounted between the upper portions of the inner walls on both sides of the support frame (27).

3. The device for preventing and controlling liquid accumulation in a coalbed methane pipeline according to claim 1, characterized in that: A well site pipeline (5) is installed on the upper side of one end of the adsorption mechanism (3), a first transmission pipe (6) is installed between the liquid pumping mechanism (2) and the gas-liquid separation mechanism (4), a second transmission pipe (7) is installed at the other end of the gas-liquid separation mechanism (4), a first connecting flange (8) is installed on the side of the outer surface of the second transmission pipe (7) and the first transmission pipe (6) close to the gas-liquid separation mechanism (4), and a coalbed methane pipeline network (9) is installed at the other end of the second transmission pipe (7).

4. The device for preventing and controlling liquid accumulation in a coalbed methane pipeline according to claim 2, characterized in that: The energy storage battery (29) is electrically connected to the solar power generation panel (28) and the water pump (23); the solar power generation panel (28) is arranged in an inclined structure; the interior of the condensate cylinder (21) is communicated with the interior of the gas transmission pipeline (1) and the first transmission pipe (6).

5. The device for preventing and controlling liquid accumulation in a coalbed methane pipeline according to claim 1, characterized in that: The adsorption mechanism (3) comprises a hot air blower (31), a hot air pipe (32), an activated carbon separator (33), an air inlet pipe (34), an air outlet pipe (35) and a steam exhaust pipe (36). The hot air pipe (32) is installed at one end of the hot air blower (31). Two activated carbon separators (33) and two steam exhaust pipes (36) are provided. The two activated carbon separators (33) are respectively installed at the other two ends of the hot air pipe (32). The air inlet pipe (34) is installed between the upper parts of one end of the two activated carbon separators (33). The other end of the air inlet pipe (34) is installed at one end of the well site pipeline (5). The air outlet pipe (35) is installed between the lower parts of the other ends of the two activated carbon separators (33), and the other end of the air outlet pipe (35) is installed at the other end of the gas transmission pipeline (1). The two steam exhaust pipes (36) are respectively installed at the middle parts of the top ends of the two activated carbon separators (33).

6. The device for preventing and controlling liquid accumulation in a coalbed methane pipeline according to claim 5, characterized in that: The hot air pipe (32), the air inlet pipe (34) and the air outlet pipe (35) are all arranged in a Y-shaped structure, and electromagnetic valves are arranged on both sides of the outer surfaces of the hot air pipe (32), the air inlet pipe (34) and the air outlet pipe (35) as well as on the steam exhaust pipe (36).

7. The device for preventing and controlling liquid accumulation in a coalbed methane pipeline according to claim 1, characterized in that: The gas-liquid separation mechanism (4) comprises a gas-liquid separation tank (41), an upper gas-liquid separation plate (42), a middle gas-liquid separation plate (43), a vent hole (44), a liquid interception plate (45) and a reflux pipe (46). Two upper gas-liquid separation plates (42) are provided, and both upper gas-liquid separation plates (42) are mounted on the top inner wall of the gas-liquid separation tank (41). The middle gas-liquid separation plate (43) is mounted on both sides of the upper gas-liquid separation plate (42). The vent holes (44) are provided between the side inner walls, and the vent holes (44) are respectively opened at one end of the two upper gas-liquid separation plates (42) and the rear side of one end of the middle gas-liquid separation plate (43). The liquid retention plate (45) is installed on one side of the bottom inner wall of the gas-liquid separation tank (41). The return pipe (46) is installed in the middle of the bottom end of the gas-liquid separation tank (41), and the other end of the return pipe (46) is installed in the middle of the outer wall of the condensate cylinder (21).

8. The device for preventing and controlling liquid accumulation in a coalbed methane pipeline according to claim 7, characterized in that: The gas-liquid separation mechanism (4) further comprises a connecting pipe (47), a second connecting flange (48), a connecting bolt (49) and a connecting nut (410). The connecting pipe (47) and the second connecting flange (48) are both provided with two, and the two connecting pipes (47) are respectively installed at the lower sides of both ends of the gas-liquid separation tank (41). The two second connecting flanges (48) are respectively installed on the side of the outer surface of the two connecting pipes (47) away from the gas-liquid separation tank (41). The connecting bolt (49) and the connecting nut (410) are both provided with a plurality, and the plurality of connecting bolts (49) are respectively installed on the opposite surfaces of the two second connecting flanges (48). The plurality of connecting nuts (410) are respectively threadedly installed on the outer surfaces of the plurality of connecting bolts (49).

9. The device for preventing and controlling liquid accumulation in a coalbed methane pipeline according to claim 8, characterized in that: The upper portion and lower portion of the outer surface of the reflux pipe (46) are respectively provided with a liquid control valve and a one-way valve, and the reflux pipe (46) is provided with an inclined structure. The upper gas-liquid separation plate (42), the middle gas-liquid separation plate (43) and the liquid retention plate (45) are all installed obliquely inside the gas-liquid separation tank (41), and the middle gas-liquid separation plate (43) is located between the two upper gas-liquid separation plates (42).

10. A method for preventing and controlling liquid accumulation in coalbed methane pipelines, applicable to the device for preventing and controlling liquid accumulation in coalbed methane pipelines according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1: Extracting the accumulated liquid: First, the water pump (23) in the liquid extraction mechanism (2) is turned on. Since the interior of the condensate cylinder (21) is connected to the interior of the gas transmission pipeline (1), the accumulated liquid in the pipeline will flow into the condensate cylinder (21) under the action of pressure. The water pump (23) extracts the accumulated liquid in the condensate cylinder (21) through the water extraction pipe (22), which can overcome the problem of being unable to remove the accumulated liquid due to low pipe pressure and small pressure difference. Step 2, gas-liquid separation: The coalbed methane enters the gas-liquid separation tank (41) through the first transmission pipe (6). When the coalbed methane passes through the upper gas-liquid separation plate (42) and the middle gas-liquid separation plate (43), the water in the coalbed methane is precipitated due to the reduction of flow velocity, sudden change of flow direction and gravity sedimentation. The liquid intercepted by the liquid interception plate (45) flows back to the condensate tank (21) through the return pipe (46); Step 3, activated carbon regeneration: Turn on the hot air blower (31) to generate hot air, and control the hot air to be transported to one activated carbon separator (33) through the solenoid valve on the hot air pipe (32), so as to remove moisture in the activated carbon separator (33) to achieve the regeneration function, while the other activated carbon separator (33) continues to process the coalbed methane, so that the two activated carbon separators (33) can work and regenerate alternately; Step 4: Energy supply: The solar panel (28) in the pumping mechanism (2) converts solar energy into electrical energy and stores it in the energy storage battery (29). The energy storage battery (29) provides power support for the water pump (23), which can overcome the problem of being unable to provide power due to the remote location of the condensate cylinder (21).

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