Movable quick moving equipment for natural gas lift drainage

Abstract

The utility model relates to the technical field of water-containing gas well exploitation, in particular to a movable natural gas lift drainage fast moving device which comprises a trailer, a pre-processing device and a natural gas supercharging device. The trailer comprises a trailer head and an axle; a natural gas supercharging device and a pre-treatment device are arranged on the axle, and the natural gas supercharging device is connected with the pre-treatment device; the pre-treatment device comprises a defoaming tank, a buffer separator, a vortex separator, a precision filter, a gas-liquid multiphase pump and a high-pressure plunger pump; the natural gas supercharging device comprises a generator set, a natural gas engine and a reciprocating compressor. Pretreatment and compression of natural gas are completed through the mobile device, then the compressed natural gas is pumped into an oil pipe or a casing pipe of a gas well, accumulated liquid at the bottom of the well is discharged, stable liquid discharging and continuous production of the gas well are achieved, and the device has the advantages of being convenient to move, safe, reliable, high in adaptability and low in operation cost.

Description

Technical Field

[0001] The utility model relates to the technical field of water-containing gas well exploitation, in particular to a mobile natural gas gas lift water drainage quick-moving device. Background Art

[0002] In the later stage of development of water-containing gas wells in oil fields, with the decrease of formation pressure, the liquid carrying capacity decreases, and the accumulation of liquid underground leads to water flooding of the production layer. If the accumulated liquid in the production layer cannot be effectively discharged, the water saturation of the production layer will increase, the gas permeability will drop sharply, and the gas production will drop sharply, which will again aggravate the problem of liquid accumulation in the wellbore and water flooding of the production layer, and finally lead to water lock and cessation of spraying.

[0003] At present, the commonly used drainage processes are divided into forced drainage, physical drainage and chemical drainage. Among them, gas lift is a kind of forced drainage process. Gas lift drainage has the characteristics of short operation cycle, wide range of gas-liquid ratio and output variation, and is suitable for harsh working conditions. It is one of the most widely used drainage technologies. The main medium is natural gas or nitrogen. After nitrogen gas lift, natural gas needs to be denitrified, which increases the cost of natural gas extraction. The pre- and post-processing process of natural gas is complicated. It is currently skid-mounted, with poor mobility and low utilization rate.

[0004] Although natural gas lift technology started late, it has developed rapidly due to its obvious advantages in process and operating costs. However, the skid-mounted type leads to low equipment utilization. In order to improve equipment utilization efficiency and reduce gas production costs, it is necessary to design a mobile natural gas lift drainage fast-moving equipment that is easy to move, safe and reliable, highly adaptable, and has low operating costs. Utility Model Content

[0005] The purpose of the utility model is to overcome the shortcomings of the prior art and proposes to design a mobile natural gas gas lift drainage quick-moving equipment, which completes the pretreatment and compression of natural gas through the mobile equipment, and then injects the compressed natural gas into the oil pipe or casing of the gas well. It has the characteristics of easy mobility, safety and reliability, strong adaptability and low operating cost.

[0006] The technical solution adopted by the utility model to solve its technical problems is:

[0007] The utility model provides a mobile natural gas gas lift drainage fast moving equipment, including a trailer, a pre-processing device and a natural gas boosting device;

[0008] The trailer includes a tractor head and an axle; among them, the tractor head is mainly driven by a diesel engine or a natural gas engine, serving as the traction part of the entire equipment, transporting the entire equipment to various working sites to achieve gas lift drainage. Anatural gas booster device and a pre-treatment device are provided on the axle, and the natural gas booster device is connected to the pre-treatment device; the axle mainly bears the weights of equipment such as the entire pre-treatment device and the natural gas booster device, playing the role of a moving foundation and bearing the vibration during the operation of the entire unit. The entire axle, pre-treatment device, and natural gas booster device are connected as a whole, adjusting the center of gravity of the whole vehicle, increasing the tire height, with a reasonable integral layout structure and strong road adaptability of the whole vehicle;

[0009] The pre-treatment device includes a de-foaming tank, a buffer separator, a vortex separator, a precision filter, a gas-liquid mixed transportation pump, and a high-pressure plunger pump; the de-foaming tank is sequentially connected to the buffer separator and the vortex separator, the vortex separator is connected to the precision filter, and the precision filter is connected to the natural gas booster device; the bottom of the buffer separator is connected to the inlet of the gas-liquid mixed transportation pump, and the outlet of the gas-liquid mixed transportation pump is connected to the external transportation pipeline network; the bottom of the vortex separator is connected to the inlet of the high-pressure plunger pump, and the outlet of the high-pressure plunger pump is connected to the external transportation pipeline network;

[0010] The natural gas booster device includes a generator set, a natural gas engine, a coupling, a clutch, and a reciprocating compressor; the generator set is connected to the natural gas engine through a coupling, and the natural gas engine is connected to the reciprocating compressor through a clutch.

[0011] Furthermore, the external transportation pipeline network includes an external transportation pipeline and a relief pipeline.

[0012] Furthermore, a duplex filter is adopted, including Filter One and Filter Two, and Filter One and Filter Two can be used simultaneously or only one of them can be used.

[0013] Furthermore, the de-foaming tank and the precision filter are both provided with backwash pipes, which are flushed regularly to ensure the filtration quality and accuracy.

[0014] Furthermore, the de-foaming tank is connected to an inlet pipe equipped with an inlet pressure reducing valve, and the precision filter is connected to an outlet pipe equipped with an outlet pressure reducing valve.

[0015] Furthermore, a liquid level gauge is provided on the buffer separator, and the liquid level gauge controls the rotation speed of the gas-liquid mixed transportation pump in a chain manner to achieve liquid level balance control; a flow meter is provided on the outlet pipe.

[0016] Furthermore, the natural gas booster device also includes a natural gas cooler, which is used to cool the natural gas and the water circuit of the natural gas engine.

[0017] Further, the natural gas boosting device further includes a control system, which is used to automatically control devices such as electronic components of the quick-moving equipment to achieve automated operation.

[0018] Technical effects of the present utility model:

[0019] Compared with the prior art, a kind of the present utility model integrates the entire natural gas treatment skid, compression skid base and liquid collection base, transports them using special vehicles, and the equipment is also operating during on-site gas injection and drainage, greatly improving the working efficiency and mobility of the equipment. The present utility model adds a defoaming device, enabling the unit to handle the remaining foam after foam drainage, ensuring the stable operation of subsequent boosting, and adapting to a wider range of wellheads. By arranging a gas-liquid mixed transportation pump at the bottom of the buffer separator, the entire unit can timely adjust according to the liquid drainage situation of the wellhead, and finally realizes closed gathering and transportation, without the need to additionally set a liquid collection skid base at the site of natural gas gas lift. At the site, the natural gas engine and the reciprocating compressor are connected through a clutch. Through the connection and separation of the clutch, the compressor can perform flow control and regulation for a long time at full flow, increasing the stability of the unit during drainage work. By configuring a generator set, the unit has zero demand for on-site public resources, neither requiring diesel nor power to be provided on-site, enabling the unit to adapt to the field wellhead site. By configuring a gas-liquid mixed transportation pump and a high-pressure plunger pump, the separated liquid can be boosted and injected into the external transportation pipeline network, so that there is no liquid discharge on-site, realizing closed gathering and transportation. Description of the drawings

[0020] Figure 1 It is a schematic structural principle diagram of the quick-moving equipment for mobile natural gas gas lift drainage of the present utility model;

[0021] Figure 2 It is a schematic structural principle diagram of the pre-treatment device of the present utility model;

[0022] Figure 3 It is a schematic diagram of the on-site operation of the quick-moving equipment of the present utility model.

[0023] In the figure, 1, truck head; 2, axle; 3, generator set; 4, natural gas engine; 5, natural gas boosting device; 6, pre-treatment device; 7, coupling; 8, clutch; 9, noise reduction room; 10, natural gas cooler; 11, reciprocating compressor; 12, tire fixing seat; 13, Christmas tree; 14, casing; 15, tubing; 16, main cut-off valve a; 17, main cut-off valve b; 18, backwashing valve a; 19, backwashing valve b; 20, main cut-off valve c; 21, main cut-off valve d; 22, backwashing valve c; 23, backwashing valve d;

[0024] 61. Import pressure reducing valve; 62. Export pressure reducing valve; 63. Defoaming tank; 64. Buffer separator; 65. Eddy current separator; 66. Precision filter; 67. Gas-liquid mixed transportation pump; 68. High-pressure plunger pump; 69. Liquid level gauge; 610. External transportation pipeline; 611. Relief pipeline; 612. Backwashing pipe; 613. Inlet pipe; 614. Outlet pipe; 615. Flowmeter;

[0025] 661. Filter 1; 662. Filter 2. Specific implementation manner

[0026] For the purpose, technical solution and advantages of the embodiments of the present utility model to be clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the specification.

[0027] Embodiment 1:

[0028] As Figure 1 shown, a fast-moving device for mobile natural gas gas lift drainage involved in this embodiment includes a trailer, a pre-treatment device 6 and a natural gas boosting device 5;

[0029] As Figure 1 shown, the trailer includes a vehicle head 1 and an axle 2. Among them, the vehicle head 1 is mainly driven by a diesel engine or a natural gas engine 4, serving as the traction part of the entire device, transporting the entire device to each operation site to achieve gas lift drainage. The natural gas boosting device 5 and the pre-treatment device 6 are arranged on the axle 2, and the natural gas boosting device 5 is connected to the pre-treatment device 6; the axle 2 mainly bears the weights of devices such as the entire pre-treatment device 6 and the natural gas boosting device 5, playing the role of a moving foundation and bearing the vibration during the operation of the entire unit. The entire axle 2, the pre-treatment device 6 and the natural gas boosting device 5 are connected as a whole, adjusting the center of gravity of the whole vehicle, increasing the height of the tires, and the overall vehicle layout structure is reasonable, and the vehicle has strong road adaptability.

[0030] As Figure 2As shown in the figure, the pre-treatment device 6 includes a defoaming tank 63, a buffer separator 64, a vortex separator 65, a precision filter 66, a gas-liquid mixed transportation pump 67, and a high-pressure plunger pump 68; the defoaming tank 63 is sequentially connected to the buffer separator 64 and the vortex separator 65, the vortex separator 65 is connected to the precision filter 66, and the precision filter 66 is connected to the natural gas boosting device 5; the bottom of the buffer separator 64 is connected to the inlet of the gas-liquid mixed transportation pump 67, and the outlet of the gas-liquid mixed transportation pump 67 is connected to the external transportation pipeline network; the bottom of the vortex separator 65 is connected to the inlet of the high-pressure plunger pump 68, and the outlet of the high-pressure plunger pump 68 is connected to the external transportation pipeline network. The defoaming tank 63 is internally provided with a defoamer, so that when the gas containing foam passes through the defoamer, the foam is quickly torn by the shearing force, and the liquid after the bubbles burst enters the buffer separator 64 together with the gas for separation. When the oil-gas mixture enters the buffer separator 64 from the oil inlet, it is sprayed onto the buffer partition after passing through the energy absorber. Due to the pressure reduction and diffusion effect, the natural gas dissolved in the crude oil is released, and the separated liquid falls to the bottom of the container by its own gravity and is discharged from the liquid discharge port, while the natural gas carrying some residual liquid passes through the gas rectifier and the mist eliminator and is discharged from the exhaust port, effectively removing the free water in the gas and being able to separate more than 95% of the liquid, and most of the water is roughly separated here. The gas containing droplets is injected into the cone body of the vortex separator 65 at a high speed along the tangential direction and makes a spiral movement from top to bottom, so that an external vortex is generated in the cone body of the fluid. The droplets in the gas are thrown towards the inner wall of the cone under the action of centrifugal force and are discharged from the bottom flow port along the inner wall under the action of gravity and the liquid. The separated clean gas spirally rises along the axis of the cone after reaching the bottom of the cone to form an internal vortex and is discharged from the outlet of the vortex separator, thereby achieving the separation of gas and liquid and effectively removing the liquid with a size of 5-25 microns.

[0031] As Figure 2 shown in the figure, the external transportation pipeline network includes an external transportation pipeline 610 and a relief pipeline 611, and the bottoms of both the buffer separator 64 and the vortex separator 65 are connected to the relief pipeline 611.

[0032] As Figure 2As shown, the precision filter 66 adopts a double filter, including filter 1 661 and filter 2 662. Filter 1 661 and filter 2 662 can be used simultaneously or separately. For example, after the deliquidation and dust removal capacity of filter 1 661 decreases, it switches to filter 2 662 to work, so that the entire unit can switch filters without stopping during operation, thereby improving the use efficiency of the unit. The precision filter 66 can adopt a sintered coalescing filter element, a mesh belt structure woven from flat stainless steel wire, and the mesh is in a chain shape, which can be used for gas-liquid and gas-solid separation, and can intercept some particles to further remove light particles in the gas. The gas passing through the separator will still carry a part of light particles, and the filter can further increase the filtering area. The filter element of the double filter can adopt a sintered wire mesh filter element, which adopts a wire mesh structure to remove droplets above 25 microns. The fine filtration adopts an eddy current separator 65, which is separated by the principle of high-speed centrifugation, mainly targeting small mist droplets, and removing liquids below 25 microns. Through two-stage separation, the liquid separation capacity is improved, and the final liquid removal efficiency reaches 99.5% of the 5um filtration efficiency, which improves the purity of the treated natural gas. In addition, under normal circumstances, the filter element does not need to be replaced. As long as the recoil mechanism is opened regularly to discharge the filtered material on the surface of the filter element from the external discharge port, the filtered natural gas can fully meet the combustion needs of the natural gas engine and the requirements of the piston gas compressor for gas.

[0033] like Figure 2 As shown, the debubble tank 63 and the precision filter 66 are both provided with a backwash pipe 612. Preferably, a differential pressure transmitter is installed on the precision filter 66. When the differential pressure transmitter indicates too high, it means that the filtering effect of the filter element is poor. At this time, the main process gas circuit valve (main cut-off valve a16, main cut-off valve b17) of the debubble tank 63 is closed, the backwash valve a18 and the backwash valve b19 are opened, the main process gas circuit valve (main cut-off valve c20, main cut-off valve d21) of the precision filter 66 is closed, the backwash valve c22 and the backwash valve d23 are opened, and the filter element is flushed by the reverse flow of gas until the flushing port removes the returned fluid, and then the backwash valve c22 and the backwash valve d23 are closed, and the main process gas circuit valve of the precision filter 66 is opened to realize the normal filtering process. The state of the filter element is monitored by the differential pressure transmitter, and the self-cleaning of the filter element is realized by the backwash valve, so that the replacement of the internal parts is avoided, and the service life and use effect of the components are improved.

[0034] like Figure 2As shown, the degassing tank 63 is connected to the intake pipe 613 equipped with an inlet pressure reducing valve 61, and the precision filter 66 is connected to the outlet pipe 614 equipped with an outlet pressure reducing valve 62. As a preferred solution, the set pressure of the inlet pressure reducing valve 61 is about 7 Mpa to stabilize the system pressure of the entire pre-treatment device 6, stabilize the unstable wellhead pressure within 7 Mpa, and ensure the subsequent gas-liquid separation and purification processes. When the wellhead pressure is high, the inlet pressure reducing valve 61 decreases; when the wellhead pressure is low, the inlet pressure reducing valve 61 increases. Even if the wellhead pressure changes continuously or is relatively high, it is stabilized to a constant pressure through the inlet pressure reducing valve 61, enabling the entire pre-treatment device 6 to operate under a stable pressure, adapting to various wellhead pressures and expanding the adaptability range of the unit. After pre-treatment, clean gas with a relatively high pressure is obtained. The set pressure of the outlet pressure reducing valve 62 can be 1 Mpa, enabling the subsequent compressor to adapt to various pressure ranges above 1 Mpa, greatly increasing the applicable range of the unit. The setting of the outlet pressure reducing valve 62 stabilizes the pressure of the natural gas entering the compressor and the engine, and through the set pressures of the inlet pressure reducing valve 61 and the outlet pressure reducing valve 62, a part of the high-pressure natural gas is stored in the entire pre-treatment device 6. When there is no natural gas supplement during the drainage stage (slug flow, mainly liquid and little natural gas comes out of the gas well), the engine of the subsequent compressor uses the natural gas stored in the pre-treatment as power, ensuring the stable operation of the unit and improving the stability of the equipment.

[0035] As Figure 2 shown, a liquid level gauge 69 is provided on the buffer separator 64, and the liquid level gauge 69 controls the rotation speed of the gas-liquid mixed transportation pump in a chain manner to achieve liquid level balance control. A flow meter 615 is provided on the outlet pipe 614 to timely count the gas injection volume, facilitating economic benefit analysis.

[0036] The gas-liquid mixed transportation pump 67 can adopt a rotary positive displacement pump, which can mix and compress gas and liquid. The inlet of the gas-liquid mixed transportation pump 67 is located at the bottom of the buffer separator 64, and the outlet is located in the external transportation pipeline network. mainly during the large-scale drainage stage, the gas-liquid mixture at the wellhead is directly compressed by the pump and transported to the external transportation pipeline network. During the concentrated liquid drainage stage, more than 80% of the wellhead is liquid. At this time, the subsequent devices of the buffer separator 64 are closed, and the gas-liquid mixed transportation pump 67 is directly started. The gas and liquid are directly pressurized to the external transportation pipeline network through the compression of the pump.

[0037] The high-pressure plunger pump 68 adopts a reciprocating piston pump. The inlet of the high-pressure plunger pump 68 is located at the bottom of the vortex separator 65. The vortex separator 65 belongs to fine dehydration, and at this time the liquid volume is relatively small. To avoid liquid discharge on-site, the high-pressure plunger pump 68 is installed at the bottom of the vortex separator 65 at this time. When the liquid level reaches a certain level, the plunger pump is started to complete the pressurization of the separated liquid and directly inject the pressurized liquid into the external transportation pipeline network, without any liquid discharge on-site.

[0038] A gas-liquid mixed transportation pump 67 is added to the bottom of the buffer separator 64, and the rotation speed of the gas-liquid mixed transportation pump 67 at its bottom is controlled by the control signal of the liquid level gauge 69. During the drainage stage, the liquid level rises rapidly. At this time, the control system receives a high liquid level signal and increases the rotation speed of the gas-liquid mixed transportation pump 67 through frequency conversion control to increase the processing capacity and inject the liquid separated by the buffer separator 64 into the external transportation pipeline network in a timely manner, avoiding the need to set up a separate liquid storage tank on site, achieving closed gathering and transportation. And a one-way valve is provided behind the pump to prevent the reverse impact of the sewage system pressure when there is no liquid and the pump is not working, protecting the pump body.

[0039] The natural gas boosting device 5 includes a reciprocating compressor 11, a natural gas engine 4, a generator set 3, a clutch 8, a noise reduction room 9, a natural gas cooler 10 and connecting pipelines; the generator set 3 is connected to the natural gas engine 4 through a coupling 7, and the natural gas engine 4 is connected to the reciprocating compressor 11 through a clutch 8.

[0040] Natural gas engine 4: Uses natural gas as power. The natural gas is directly used after being separated and purified from wellhead gas. It drives the reciprocating compressor 11 through the clutch 8 and drives the generator set 3 through the coupling 7.

[0041] Reciprocating compressor 11: The volume of the cylinder changes periodically through the reciprocating motion of the piston in the cylinder to achieve gas boosting, belonging to a positive displacement compressor.

[0042] Noise reduction room 9: Used for noise reduction of the unit. Rock wool is used as the noise reduction and heat insulation filling medium. Rock wool has a porous structure composed of many fibers, which is installed between the layers, converts the absorbed sound energy into heat, reduces the sound wave reflection and reduces the noise of the unit. The heat insulation rock wool board can effectively delay the spread of fire and will not produce toxic gases or molten droplets in case of fire.

[0043] Natural gas cooler 10: Used to cool the natural gas and the water circuit of the natural gas engine 4. It adopts finned tube type heat sinks and uses a variable frequency fan to drive the ventilation volume. Part of the tube bundle cools the natural gas that is compressed and heated during cooling to cool its temperature to ensure the normal progress of the next stage of compression; part of the tube bundle cools the water circuit of the natural gas engine 4 to timely dissipate the heat generated during the engine operation to ensure the stable operation of the engine.

[0044] Clutch 8: Located between the flywheel disc of the natural gas engine 4 and the shaft head of the reciprocating compressor 11, used to transfer the torque stored on the flywheel of the natural gas engine 4 to the reciprocating compressor 11. In the engaged state, the natural gas engine 4 drives the reciprocating compressor 11 to rotate to complete the boosting of natural gas; in the separated state, the natural gas engine 4 does not drive the reciprocating compressor 11 to rotate, and the reciprocating compressor 11 is in a stagnant state.

[0045] Coupling 7: It is used to connect the tail shaft of the natural gas engine 4 and the generator set 3, transmit the torque of the natural gas engine 4 to the generator set 3, and drive the generator set 3 to generate electricity;

[0046] Generator set 3: It is used to drive the operation of equipment such as the fan of the natural gas cooler 10, the heater of the natural gas engine 4, and the lubricating oil pump;

[0047] The clutch 8 adopted by the natural gas boosting device 5 of the present utility model connects the natural gas engine 4 and the reciprocating compressor 11. In the initial working state, there is more gas in the wellhead gas-liquid mixture. At this time, it is necessary to boost the gas and inject it into the well to discharge the bottom-hole liquid accumulation. As the wellhead liquid is discharged, the liquid content at the wellhead gradually decreases. When the gas is lower than the rated processing capacity of the reciprocating compressor 11, the reciprocating compressor 11 is made not to work by separating the clutch 8 to ensure the stability of the reciprocating compressor 11. The present utility model is equipped with a generator set 3, so that there is power supply after the natural gas engine 4 is started on-site for the whole unit, including the rotation of the fan, the operation of the heater, the rotation of the pre-lubricating oil pump, etc., reducing the on-site power demand and improving the ability of the unit to adapt to field operations. As a preferred solution, the fan of the natural gas cooler 10 of the present utility model is driven by a variable-frequency motor, and the rotation speed of the fan of the natural gas cooler 10 is controlled by an exhaust temperature sensor. When the temperature rises, the fan speed is increased, and when the temperature drops, the fan speed is decreased, finally making the inter-stage temperature of the unit constant and ensuring the stable operation of the equipment.

[0048] The quick-moving equipment of the present utility model has the following advantages:

[0049] 1. Reverse lift for liquid drainage: Connect the tubing 15 to the inlet of the reciprocating compressor 11, connect the outlet to the casing 14, and connect the gas-liquid mixed transportation pump 67 to the external transportation pipeline network. The gas in the tubing 15 is pressed into the casing 14 by the unit, and the liquid in the casing 14 enters the tubing 15 and is lifted out. It is mainly applied to the gas lift of conventional water wells. The biggest advantage is that after the lift is completed, the valve can be switched directly for production operations, and continuous gas lift can be carried out.

[0050] 2. Forward lift: Connect the casing 14 to the inlet of the reciprocating compressor 11, and connect the tubing 15 to the outlet of the reciprocating compressor 11. The gas in the casing 14 is pressed into the tubing 15 by the unit, and the liquid in the tubing 15 enters the casing 14 and is lifted out. It is especially suitable for the gas lift of water wells with serious waterlogging and deep gas wells. After the gas lift is completed, the valve is cut off, and production can only be carried out after waiting for a period of time, and continuous gas lift operation cannot be carried out.

[0051] 3. Mixed transportation for pressure reduction and negative pressure production. For high water cut wells or low permeability and low production wells, after the liquid in the wellbore is discharged by gas lift, the liquid carrying capacity of the gas production is insufficient, and continuous gas lift will increase the bottom hole flowing pressure, which is not conducive to the liquid in the producing formation flowing into the wellbore. At this time, the gas-liquid mixed transportation pump 67 is directly used to pump the gas and liquid away from the wellhead, reducing the wellhead back pressure, greatly improving the gas liquid carrying rate, shortening the operation cycle, and improving the process effect and validity period. The gas-liquid mixed transportation pump 67 can effectively reduce the wellhead pressure, increase the production, improve the critical liquid carrying capacity, enhance the liquid discharging capacity of the gas well, and effectively remove the liquid in the bottom hole.

[0052] The utility model optimizes the pre-treatment and compression processes, integrates the closed gathering and transportation of separated liquid and the mixed transportation for pressure reduction and negative pressure liquid drainage. The whole skid is a single vehicle, with the characteristics of convenient movement, safety and reliability, and strong adaptability. In addition, the well gas port fuel, driven by a gas engine, has low operating costs; the utility model also includes a control system for realizing automatic pressure regulation, automatic flow regulation of the reciprocating compressor 11, and automatic control of the separated liquid level, with strong working condition adaptability; the combined design of the defoaming tank 63, the vortex separator 65 and the precision filter 66 can adapt to the slug flow working condition and complex media on site; the automatic control of the separated liquid level, the pressurized closed gathering and transportation of the gas-liquid mixed transportation pump 67, is environmentally friendly and safe.

[0053] The above specific embodiments are only specific cases of the utility model. The patent protection scope of the utility model includes but is not limited to the above specific embodiments. Any appropriate changes or modifications made by any person skilled in the art who meets the claims of the utility model shall fall within the patent protection scope of the utility model.

Claims

1. A fast-moving device for mobile natural gas gas lift drainage, characterized in that: It includes a trailer, a pre-treatment device (6) and a natural gas booster device (5); The trailer includes a cab (1) and an axle (2); the natural gas booster device (5) and the pre-treatment device (6) are arranged on the axle (2); The pre-treatment device (6) includes a de-foaming tank (63), a buffer separator (64), a vortex separator (65), a precision filter (66), a gas-liquid mixed transportation pump (67), and a high-pressure piston pump (68); the de-foaming tank (63) is sequentially connected to the buffer separator (64) and the vortex separator (65), the vortex separator (65) is connected to the precision filter (66), and the precision filter (66) is connected to the natural gas booster device (5); the bottom of the buffer separator (64) is connected to the inlet of the gas-liquid mixed transportation pump (67), and the outlet of the gas-liquid mixed transportation pump (67) is connected to the external transportation pipeline network; the bottom of the vortex separator (65) is connected to the inlet of the high-pressure piston pump (68), and the outlet of the high-pressure piston pump (68) is connected to the external transportation pipeline network; The natural gas booster device (5) includes a generator set (3), a natural gas engine (4), a coupling (7), a clutch (8), and a reciprocating compressor (11); the generator set (3) is connected to the natural gas engine (4) through the coupling (7), and the natural gas engine (4) is connected to the reciprocating compressor (11) through the clutch (8).

2. The quick-moving device for mobile natural gas gas lift drainage according to claim 1, characterized in that: The external transportation pipeline network includes an external transportation pipeline (610) and a relief pipeline (611).

3. The quick-moving device for mobile natural gas gas lift drainage according to claim 1, wherein: The precision filter (66) adopts a duplex filter, including a filter one (661) and a filter two (662).

4. The quick-moving device for mobile natural gas gas-lift drainage according to claim 1, characterized in that: Both the de-foaming tank (63) and the precision filter (66) are provided with backwash pipes (612).

5. The quick-moving device for mobile natural gas gas-lift drainage according to claim 1, characterized in that: The de-foaming tank (63) is connected to an intake pipe (613) equipped with an inlet pressure reducing valve (61), and the precision filter (66) is connected to an outlet pipe (614) equipped with an outlet pressure reducing valve (62).

6. The quick-moving device for mobile natural gas gas lift drainage according to claim 5, characterized in that: A flowmeter (615) is arranged on the outlet pipe (614).

7. The quick-moving device for mobile natural gas gas-lift drainage according to claim 1, characterized in that: A liquid level gauge (69) is arranged on the buffer separator (64), and the liquid level gauge (69) controls the rotation speed of the gas-liquid mixed transportation pump (67) in a chained manner.

8. The quick-moving device for mobile natural gas gas-lift drainage according to claim 1, characterized in that: The natural gas booster device (5) further includes a natural gas cooler (10).

9. The quick-moving device for mobile natural gas gas lift water drainage according to claim 1, characterized in that: The natural gas booster device (5) further includes a control system.

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