Natural gas flushing fluid separation and recovery device

Abstract

The utility model relates to a natural gas flushing fluid separation and recovery device, which belongs to the field of oil field equipment and comprises a centrifugal machine, a condensate oil tank, a condensate oil pump, a colloid tank, a colloid pump, a water tank, a filter booster pump and an activated carbon filter. Flushing fluid foam enters from a liquid inlet of the centrifugal machine, and liquid outlets of the centrifugal machine comprise the first liquid outlet, the second liquid outlet and the third liquid outlet. The first liquid outlet is connected with a condensate oil tank, and the condensate oil tank is connected with a condensate oil pump; the second liquid outlet is connected with a colloid tank which is connected with a colloid pump; the third liquid outlet is connected with a water tank, and the water tank, the filtering booster pump and the activated carbon filter are sequentially connected. According to the utility model, the flushing fluid foam is separated into various components at one time through the centrifugal machine, and the separated components are respectively recycled, so that the effect of separating the flushing fluid foam is good, and the liquid-phase component is thoroughly separated from condensate oil.

Description

Technical Field

[0001] The utility model belongs to the field of oil field equipment, and in particular relates to a natural gas well washing liquid separation and recovery device. Background Art

[0002] During the natural gas extraction process, formation water and condensate will continue to enter the wellbore along with the natural gas. In the early stages of extraction, natural gas has enough energy to bring the formation water and condensate in the wellbore to the surface. In the middle and late stages of extraction, due to insufficient gas volume or a large amount of liquid in the production layer, the gas can no longer bring the liquid to the surface, resulting in liquid accumulation at the bottom of the well and in the wellbore. If the accumulated liquid cannot be discharged in time, back pressure will be generated, and the permeability of the production layer near the well wall will be reduced, causing a sharp drop in natural gas production and even leading to flooding and shutdown.

[0003] In order to extend the exploitation life of gas fields and increase the production of gas wells, a foam well-washing method is proposed. A certain amount of foaming agent is injected into the gas well. Under the stirring of natural gas, the foaming agent and the accumulated liquid generate a large amount of well-washing fluid foam. The fine and tight structure of the well-washing fluid foam has viscosity, which makes it have better carrying capacity and is easier to be brought to the ground by the natural gas flow.

[0004] In order to improve resource utilization and reduce emission pollution, it is necessary to separate the condensate oil in the well washing fluid foam. However, the existing separation device has poor ability to process well washing fluid foam. This is because the well washing fluid foam is difficult to form a stable interface, which often exceeds its designed processing capacity during separation, resulting in incomplete separation, such as the foam cannot be digested, the liquid phase components and the condensate oil are not completely separated, and the solid phase suspended impurities are attached to the wall and scale or even block the pipeline, which interferes with the subsequent processing device. Therefore, a device for separating and recovering condensate oil in well washing fluid foam is needed. Utility Model Content

[0005] In order to solve the above problems existing in the prior art, the utility model provides a natural gas well washing liquid separation and recovery device. The technical problem to be solved by the utility model is achieved through the following technical solutions:

[0006] The utility model provides a natural gas well-washing liquid separation and recovery device, comprising: a centrifuge, a condensate oil tank, a condensate oil pump, a colloid tank, a colloid pump, a water tank, a filter booster pump and an activated carbon filter; wherein, the well-washing liquid foam is fed into the liquid inlet of the centrifuge, and the liquid outlet of the centrifuge comprises: a first liquid outlet, a second liquid outlet and a third liquid outlet; the first liquid outlet is connected to the condensate oil tank, and the condensate oil tank is connected to the condensate oil pump; the second liquid outlet is connected to the colloid tank, and the colloid tank is connected to the colloid pump; the third liquid outlet is connected to the water tank, and the water tank, the filter booster pump and the activated carbon filter are connected in sequence.

[0007] In one embodiment of the utility model, the first liquid outlet is arranged above the centrifuge, the second liquid outlet and the third liquid outlet are respectively arranged on both sides of the centrifuge, and the heights of the first liquid outlet and the second liquid outlet are both higher than the height of the third liquid outlet.

[0008] In one embodiment of the present invention, the centrifuge is a disc centrifuge.

[0009] In one embodiment of the utility model, the well washing fluid foam passes through a liquid inlet assembly before entering the centrifuge. The liquid inlet assembly includes a well washing fluid tank and a centrifugal liquid inlet pump. The well washing fluid tank is connected to the centrifugal liquid inlet pump, and the centrifugal liquid inlet pump is connected to the liquid inlet of the centrifuge.

[0010] In one embodiment of the utility model, the condensate pump, the filter booster pump and the centrifugal liquid feed pump are all corrosion-resistant self-priming centrifugal pumps.

[0011] In one embodiment of the utility model, the colloid pump is a stepless speed-regulating screw pump.

[0012] In one embodiment of the utility model, the condensate tank, the colloid tank, the water tank and the well washing fluid tank are all flat-bottomed conical-top vertical storage tanks, and all have liquid inlet and outlet through the bottom.

[0013] In one embodiment of the utility model, liquid level gauges are installed on the side walls of the condensate tank, the colloid tank, the water tank and the well washing liquid tank.

[0014] In one embodiment of the utility model, there are two groups of activated carbon filters, the liquid outlets of the two groups of activated carbon filters are connected to each other, and the liquid inlets of the two groups of activated carbon filters are connected to each other; both groups of activated carbon filters take in liquid from the bottom and discharge liquid from the top.

[0015] In one embodiment of the present invention, a diversion pipeline is connected between the liquid outlets of the two groups of activated carbon filters.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] The utility model of the natural gas well-washing liquid separation and recovery device separates the well-washing liquid foam into multiple components at one time through a centrifuge, and recycles and processes the separated components respectively, with good effect of separating the well-washing liquid foam, and completely separating the liquid phase components from the condensate oil. The process is simple and efficient, and can fully recycle and save resources, only uses physical separation, no chemical agent consumption, and does not increase the complexity of the product.

[0018] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the utility model more obvious and easy to understand, the following preferred embodiments are specifically cited and described in detail with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a natural gas well washing liquid separation and recovery device provided by an embodiment of the utility model;

[0020] Figure 2 It is a structural schematic diagram of another natural gas well washing liquid separation and recovery device provided by an embodiment of the utility model.

[0021] Figure numerals: 1-centrifuge; 11-first liquid outlet; 12-second liquid outlet; 13-third liquid outlet; 2-condensate oil tank; 3-condensate oil pump; 4-colloid tank; 5-colloid pump; 6-water tank; 7-filter booster pump; 8-activated carbon filter; 9-liquid inlet assembly; 10-well washing fluid tank; 101-centrifugal liquid inlet pump. DETAILED DESCRIPTION

[0022] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined purpose of the present invention, a natural gas well washing liquid separation and recovery device proposed by the present invention is described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0023] The above and other technical contents, features and effects of the utility model are clearly presented in the following detailed description of the specific implementation mode in conjunction with the accompanying drawings. Through the description of the specific implementation mode, the technical means and effects adopted by the utility model to achieve the predetermined purpose can be more deeply and specifically understood. However, the attached drawings are only for reference and explanation, and are not used to limit the technical solution of the utility model.

[0024] Embodiment 1

[0025] Conventional natural gas well washing fluid separation devices, such as three-phase separators, are based on stable liquid levels and oil-water interfaces to achieve oil-water separation. Since it is difficult for well washing fluid foam to form a stable interface, it is difficult to separate or the separation effect and efficiency are poor, and the separation often exceeds its designed processing capacity.

[0026] The natural gas well washing fluid foam is a mixed milky white foam when it is returned from the natural gas wellhead. After centrifugal treatment of the natural gas foam well washing fluid, it is found that it can be clearly separated into: condensate oil, colloid and water, and they are in the upper, middle and lower layers in order of specific gravity. Among them, the water is slightly emulsified, and some solid suspended impurities are retained in it.

[0027] It should be noted that condensate oil is a light oil fraction that condenses into liquid form when natural gas is reduced in pressure and temperature. Its main components are a mixture of hydrocarbons from C5 to C8, and contain a small amount of hydrocarbon impurities greater than C8. Its specific gravity is usually less than 0.78. Colloid: Colloid is a combination of organic matter and calcium-barium minerals, usually with some natural gas, hydrogen sulfide, paraffin, mud, sand, dust and mechanical impurities, and finally forms an opaque, sticky, flowable and plastic substance. Its specific gravity is often less than 1. After centrifugal treatment, it is distributed between the condensate oil and the water layer. Water: Since the associated water of natural gas is formation brine, it often dissolves inorganic salts such as sodium, calcium, potassium chloride and sulfate, and may also be accompanied by fine suspended matter carried by the well washing fluid. Its specific gravity can be approximately 1. When recovering and processing, it is necessary to carry out corresponding treatment according to the physical properties (mainly specific gravity) and main dissolved components of condensate oil, colloid and water.

[0028] In view of this, this embodiment provides a natural gas well washing fluid separation and recovery device.

[0029] like Figure 1 As shown, the natural gas well-washing liquid separation and recovery device includes: a centrifuge 1, a condensate tank 2, a condensate pump 3, a colloid tank 4, a colloid pump 5, a water tank 6, a filter booster pump 7 and an activated carbon filter 8; wherein, the well-washing liquid foam is fed into the liquid inlet of the centrifuge 1, and due to the different specific gravities of each component, the well-washing liquid foam is separated into three liquid components, namely, condensate, colloid and water, after centrifugation in the centrifuge 1. Correspondingly, the centrifuge 1 is also provided with three liquid outlets, and the three liquid components flow out from the three liquid outlets respectively for subsequent recovery and treatment.

[0030] Specifically, the liquid outlet of the centrifuge 1 includes: a first liquid outlet 11, a second liquid outlet 12 and a third liquid outlet 13, the first liquid outlet 11 is connected to the condensate oil tank 2, and the condensate oil tank 2 is connected to the condensate oil pump 3; the second liquid outlet 12 is connected to the colloid tank 4, and the colloid tank 4 is connected to the colloid pump 5; the third liquid outlet 13 is connected to the water tank 6, and the water tank 6, the filter booster pump 7 and the activated carbon filter 8 are connected in sequence.

[0031] In an optional embodiment, the first liquid outlet 11 is arranged above the centrifuge 1, and the second liquid outlet 12 and the third liquid outlet 13 are respectively arranged on both sides of the centrifuge 1, and the heights of the first liquid outlet 11 and the second liquid outlet 12 are higher than the height of the third liquid outlet 13, that is, they correspond to the specific gravities of the three liquid phase components, respectively, so as to facilitate complete separation.

[0032] In an optional embodiment, the centrifuge 1 is a disc centrifuge. Preferably, the disc separator can be made of SUS316 material, and its converter can be made of 2205 steel, and an explosion-proof motor can be used. Furthermore, a starter cabinet is provided at the use site of the natural gas well washing liquid separation and recovery device of this embodiment to control the start and stop of the disc centrifuge, and remote control can also be achieved through a programmable logic controller (PLC).

[0033] The principle is that after centrifugation in the centrifuge 1, the well washing fluid foam is divided into three liquid components, namely condensate oil, colloid and water. In order to recycle and treat the three liquid components respectively, three independent recovery paths are set up accordingly. Among them, the condensate oil tank 2 is connected to the condensate oil pump 3 to form a condensate oil recovery path, which is used to separate and recover the condensate oil in the well washing fluid foam; the colloid tank 4 is connected to the colloid pump 5 to form a colloid recovery path, and the colloid pump 5 is used to concentrate and treat the organic colloid components in the well washing fluid foam; the water tank 6, the filter booster pump 7 and the activated carbon filter 8 are connected in sequence to form a water recovery path, which is used to recover water, inorganic salts and solid suspended impurities in the well washing fluid foam.

[0034] In an optional embodiment, both the condensate oil pump 3 and the filter booster pump 7 may be corrosion-resistant self-priming centrifugal pumps.

[0035] In an optional embodiment, the colloid pump 5 can be a stepless speed-adjustable screw pump, which can be made of SUS316 material and can also use an explosion-proof motor.

[0036] In an optional embodiment, the condensate tank 2, the colloid tank 4 and the water tank 6 can all be flat-bottomed cone-top vertical storage tanks, all of which have liquid inlet and outlet from the bottom, and are respectively provided with a flame arrester and a breathing valve on the top. Furthermore, double manholes, ladders and guardrails are respectively provided on the top and sides of the condensate tank 2, the colloid tank 4 and the water tank 6, and an electrostatic grounding structure is provided.

[0037] In an optional embodiment, liquid level gauges are installed on the side walls of the condensate tank 2, the colloid tank 4 and the water tank 6 to obtain the liquid level height and liquid level fluctuation. Optionally, the liquid level gauge can be a local and remote level gauge.

[0038] In an optional embodiment, the centrifuge 1, condensate oil tank 2, condensate oil pump 3, colloid tank 4, colloid pump 5, water tank 6, filter booster pump 7 and activated carbon filter 8 are connected by flanges and pipes. The pipe material can be 304 stainless steel or higher standard stainless steel, and the flanges are bridged by static conductive copper tape. Shockproof rubber pads can be used on the installation bases of the centrifuge 1, condensate oil pump 3, colloid pump 5 and filter booster pump 7 to reduce resonance and noise. The electrical control components in the natural gas well washing liquid separation and recovery device are respectively arranged in the electrical control box. The electrical control box as a whole adopts a skid-mounted structure that is easy to transport and plays a role in preventing rain and wind and sand.

[0039] In an optional embodiment, the outlets of the condensate pump 3, the colloid pump 5 and the filter booster pump 7 are all provided with transparent mirrors; the inlet and outlet of the centrifuge 1 and the activated carbon filter 8 are all provided with transparent mirrors to facilitate observation of the color and transparency of the liquid phase components. Furthermore, sampling valves are also provided at the outlets of the centrifuge 1, the condensate pump 3, the colloid pump 5, the filter booster pump 7 and the activated carbon filter 8, respectively.

[0040] In an optional embodiment, according to the different operating environment temperatures of the natural gas well washing fluid separation and recovery device, electric heating belts and insulation layers may be installed to prevent the device from bursting due to ice formation inside the device due to severe cold.

[0041] In this embodiment, there are two groups of activated carbon filters 8, the liquid outlets of the two groups of activated carbon filters 8 are connected to each other, and the liquid inlets of the two groups of activated carbon filters 8 are connected to each other; both groups of activated carbon filters 8 take in liquid from the bottom and discharge liquid from the top.

[0042] Furthermore, a shunt pipeline is connected between the liquid outlets of the two groups of activated carbon filters 8 .

[0043] Preferably, the activated carbon filter 8 is filled with large-grained fruit shell activated carbon for water purification, and a steel wire mesh isolation filter layer is provided on the upper and lower sides of the large-grained fruit shell activated carbon for water purification. Optionally, the steel wire mesh can be made of SUS316 material.

[0044] The principle is that, taking two groups of activated carbon filters 8 as an example, two groups of activated carbon filters 8 are set up for use interchangeably, that is, one for use and one for standby, and the liquid outlet of one group of activated carbon filters 8 is connected to the liquid outlet of the other group of activated carbon filters 8 through a shunt pipeline. Inside the activated carbon filter 8, the incoming liquid flows from bottom to top, and impurities will gradually accumulate in the lower part, and the impurities will be self-aggregated and absorbed into a muddy state. Before the internal filler of the activated carbon filter 8 of the working group is saturated, the clear effluent is diverted through the shunt pipeline and flushes the activated carbon filter 8 of the standby group from top to bottom, so that the impurities in the activated carbon filter 8 of the standby group are flushed downward and discharged, realizing the interactive regeneration of the two groups of activated carbon filters 8.

[0045] The working principle of the natural gas well washing liquid separation device of this embodiment is that the natural gas well washing liquid foam is returned from the natural gas wellhead, the centrifuge 1 is installed horizontally, started without load, and after the top is fed, the inlet and outlet liquid flow rates are adjusted by valves set at the inlet and outlet, and the three-phase separation equilibrium state is observed and adjusted through a transparent sight glass, and then fine-tuned to full load operation, so that the inlet liquid flow rate reaches the full load of the centrifuge, ensuring that the condensate oil after centrifugation is clear and free of impurities, the colloid is thick and flowable, and the water has no micelles. According to the changes in the composition of the well washing liquid, it can also be adjusted manually or remotely dynamically by setting a detection device to ensure the centrifugal efficiency while achieving a good centrifugal effect.

[0046] After centrifugation in the centrifuge 1, it is divided into three liquid components, namely, condensate, colloid and water. The condensate is discharged into the condensate tank 2, and liquid is fed into the bottom to fully dissipate static electricity. The liquid level is monitored by a liquid level meter, and the high and low liquid levels are monitored and alarmed. The flow rate discharged into the condensate pump 3 is also controlled to improve the recovery and processing efficiency, that is, the condensate pump 3 discharges the condensate when it is close to full load, and then the discharged condensate is recovered. The colloid is discharged into the colloid tank 4, and liquid is fed into the bottom to fully dissipate static electricity. The liquid level is monitored by a liquid level meter, and the flow rate discharged into the colloid pump 5 is controlled. After the colloid is discharged, it can be purified by incineration of hazardous waste. Water is discharged into the water tank 6, and the liquid is also fed from the bottom. The liquid level is monitored by a liquid level meter to control the flow rate discharged into the filter booster pump 7. Since some solid suspended impurities are still left in the water, the trace amount of residual solid suspended impurities is intercepted by the activated carbon filter 8. The clean water can be recycled and used to reconfigure the well washing fluid or to clean the inside of the natural gas well washing fluid separation device after the centrifuge 1 is shut down. After flushing the inside, it is emptied, and the emptied liquid can also be recycled back to the water tank 6 for use. The solid suspended impurities can be incinerated and purified by hazardous waste.

[0047] After the natural gas well-washing liquid separation and recovery device is installed, the whole device is tested for static grounding. The resistance between the device and the ground is no more than 4 ohms, so that the device is in a lightning and static protection state. In addition, the installation and use of electrical equipment in the natural gas well-washing liquid separation and recovery device meet the requirements of the use environment explosion-proof and communication protocol.

[0048] It is worth noting that the natural gas well-washing liquid separation and recovery device of this embodiment uses a centrifuge 1 to separate the well-washing liquid foam at one time, fully recovers the condensate oil to save resources, fully concentrates the colloid to save space, and after the water passes through the activated carbon to remove the residual solid suspended impurities, the completely clear water is reused to prepare the well-washing liquid, thus realizing water circulation and saving the consumption of fresh water resources. The process is simple and efficient, only using physical separation, without any consumption of chemical agents, and does not increase the complexity of the product. Therefore, the natural gas well-washing liquid separation and recovery device of this embodiment has the characteristics of low cost, high purification efficiency, green environmental protection, low energy consumption and simple operation.

[0049] Embodiment 2

[0050] like Figure 2 As shown, the difference between this embodiment and the first embodiment is that the well washing liquid foam needs to pass through the liquid inlet component 9 before entering the centrifuge 1. The liquid inlet component 9 includes: a well washing liquid tank 10 and a centrifugal liquid inlet pump 101. The well washing liquid tank 10 is connected to the centrifugal liquid inlet pump 101, and the centrifugal liquid inlet pump 101 is connected to the liquid inlet of the centrifuge 1.

[0051] Preferably, the well washing liquid tank 10 can be a flat-bottomed conical-top vertical storage tank, with liquid inlet and outlet through the bottom, and a flame arrester and a breathing valve are respectively provided on the top.

[0052] Preferably, a liquid level meter is installed on the side wall of the well washing fluid tank 10 .

[0053] Preferably, the centrifugal liquid inlet pump 101 can be a corrosion-resistant self-priming centrifugal pump.

[0054] Preferably, the outlet of the centrifugal liquid inlet pump 101 is provided with a transparent sight glass.

[0055] The principle is that the natural gas well washing liquid foam is returned from the natural gas wellhead and enters the well washing liquid tank 10 in the form of mixed milky white foam, and is temporarily stored and initially allowed to stand in the well washing liquid tank 10, so that the well washing liquid foam is slightly stratified. It should be noted that at this time, the upper part of the well washing liquid tank 10 is still a foam layer, and there is still a small amount of volatile natural gas, which is discharged into the flare system through the top flame arrester and the breathing valve or dissipated with natural ventilation. The main liquid components are monitored by the liquid level meter, and the flow discharged into the centrifugal liquid inlet pump 101 is controlled in combination with the subsequent processing volume and liquid level fluctuations, and discharged to the centrifuge 1 through the centrifugal liquid inlet pump 101.

[0056] It is worth noting that the foam of the well-washing liquid passes through the liquid inlet assembly 9 before entering the centrifuge 1, and the flow rate of the foam of the well-washing liquid discharged to the centrifuge 1 can be controlled, so that the centrifuge 1 can work under a nearly full load condition, and has both centrifugal effect and centrifugal efficiency. At the same time, the foam of the well-washing liquid is temporarily stored in the well-washing liquid tank 10 and initially left to stand, so that the foam of the well-washing liquid is slightly stratified, which can also play a role in preliminary treatment of the foam of the well-washing liquid.

[0057] The utility model of the natural gas well-washing liquid separation and recovery device separates the well-washing liquid foam into multiple components at one time through a centrifuge, and recycles and processes the separated components respectively, with good effect of separating the well-washing liquid foam, and completely separating the liquid phase components from the condensate oil. The process is simple and efficient, and can fully recycle and save resources, only uses physical separation, no chemical agent consumption, and does not increase the complexity of the product.

[0058] It should be noted that, in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the term "include", "comprise" or any other variant is intended to cover non-exclusive inclusion, so that the article or device including a series of elements includes not only those elements, but also other elements that are not explicitly listed. In the absence of more restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the article or device including the elements. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The orientation or position relationship indicated by "up", "down", "left", "right", etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the utility model.

[0059] The above contents are further detailed descriptions of the present invention in combination with specific preferred implementations, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A natural gas well washing liquid separation and recovery device, characterized in that: include: A centrifuge (1), a condensate oil tank (2), a condensate oil pump (3), a colloid tank (4), a colloid pump (5), a water tank (6), a filter booster pump (7) and an activated carbon filter (8); wherein: Well washing fluid foam is fed into the liquid inlet of the centrifuge (1), and the liquid outlet of the centrifuge (1) comprises: a first liquid outlet (11), a second liquid outlet (12) and a third liquid outlet (13); the first liquid outlet (11) is connected to the condensate oil tank (2), and the condensate oil tank (2) is connected to the condensate oil pump (3); the second liquid outlet (12) is connected to the colloid tank (4), and the colloid tank (4) is connected to the colloid pump (5); the third liquid outlet (13) is connected to the water tank (6), and the water tank (6), the filter booster pump (7) and the activated carbon filter (8) are connected in sequence.

2. The natural gas well washing liquid separation and recovery device according to claim 1, characterized in that: The first liquid outlet (11) is arranged above the centrifuge (1), the second liquid outlet (12) and the third liquid outlet (13) are arranged on both sides of the centrifuge (1), and the heights of the first liquid outlet (11) and the second liquid outlet (12) are both higher than the height of the third liquid outlet (13).

3. The natural gas well washing liquid separation and recovery device according to claim 1, characterized in that: The centrifuge (1) is a disc centrifuge.

4. The natural gas well washing liquid separation and recovery device according to claim 1, characterized in that: The well-washing liquid foam passes through a liquid inlet assembly (9) before entering the centrifuge (1). The liquid inlet assembly (9) comprises: a well-washing liquid tank (10) and a centrifugal liquid inlet pump (101). The well-washing liquid tank (10) is connected to the centrifugal liquid inlet pump (101), and the centrifugal liquid inlet pump (101) is connected to the liquid inlet of the centrifuge (1).

5. The natural gas well washing liquid separation and recovery device according to claim 4, characterized in that: The condensate oil pump (3), the filter booster pump (7) and the centrifugal liquid feed pump (101) are all corrosion-resistant self-priming centrifugal pumps.

6. The natural gas well washing liquid separation and recovery device according to claim 1, characterized in that: The colloid pump (5) is a stepless speed-regulating screw pump.

7. The natural gas well washing liquid separation and recovery device according to claim 4, characterized in that: The condensate oil tank (2), the colloid tank (4), the water tank (6) and the well washing fluid tank (10) are all flat-bottomed conical-top vertical storage tanks, and all have liquid inlet and outlet through the bottom.

8. The natural gas well washing liquid separation and recovery device according to claim 7, characterized in that: The side walls of the condensate tank (2), the colloid tank (4), the water tank (6) and the well-washing liquid tank (10) are all installed with liquid level gauges.

9. The natural gas well washing liquid separation and recovery device according to claim 1, characterized in that: There are two groups of activated carbon filters (8), the liquid outlets of the two groups of activated carbon filters (8) are connected to each other, and the liquid inlets of the two groups of activated carbon filters (8) are connected to each other; the two groups of activated carbon filters (8) both have liquid inlet from the bottom and liquid outlet from the top.

10. The natural gas well washing liquid separation and recovery device according to claim 9, characterized in that: A diversion pipeline is connected between the liquid outlets of the two groups of activated carbon filters (8).

Images