Well head gas separation system

Abstract

The utility model provides a wellhead gas separation system, which relates to the technical field of gas processing equipment and comprises a drying mechanism, a purification device, a gas treatment device and a liquid treatment device. The drying mechanism is used for receiving the well head gas, and the well head gas is discharged after being dried by the drying mechanism. And the discharge end of the purification device is connected with the discharge end of the drying mechanism. The gas treatment device comprises a condenser, the condenser is connected with the purification device, and the condenser is used for condensing gas discharged by the purification device. The liquid treatment device is connected with a liquid outlet of the purification device, the liquid treatment device comprises a reboiler, and the reboiler is connected with a discharge end of the purification device. According to the device disclosed by the utility model, carbon dioxide is separated and purified in a condensation and reboiling manner, the application range of gas concentration is wide, well head gas with the CO2 concentration of 35% and the pressure of more than 2.5 MPag can be treated, the concentration of purified carbon dioxide liquid is relatively high and can reach more than 99%, and the operation is continuous and stable.

Description

Technical Field

[0001] The utility model relates to the technical field of gas processing equipment, in particular to a wellhead gas separation system. Background Art

[0002] At present, oil fields are gradually promoting the use of carbon dioxide gas drive to extract oil. However, with the injection of carbon dioxide, the concentration of carbon dioxide in the wellhead gas of the oil field gradually increases, which can easily affect the purity of natural gas in the wellhead gas.

[0003] The existing technologies mostly use gas separation and condensation technology to separate and condense carbon dioxide from mixed gas. The existing technologies for separating and condensing carbon dioxide are divided into chemical methods and physical methods. The chemical method is difficult to use on a large scale due to its high investment and operating costs. The physical method uses an adsorbent to adsorb carbon dioxide in the treated gas, and then desorbs and condenses it for liquefaction and purification.

[0004] However, the physical method is only suitable for treating gases containing high concentrations of carbon dioxide, and is less effective in separating and purifying low concentrations of carbon dioxide. Utility Model Content

[0005] The utility model aims to provide a wellhead gas separation system to alleviate the technical problem of poor applicability of equipment for purifying carbon dioxide in the prior art.

[0006] The wellhead gas separation system provided by the utility model comprises a drying mechanism, a purification device, a gas processing device and a liquid processing device; the drying mechanism is used to receive wellhead gas, and the wellhead gas is discharged after being dried by the drying mechanism; the discharge end of the purification device is connected to the discharge end of the drying mechanism; the gas processing device comprises a condenser, which is connected to the purification device, and the condenser is used to condense the gas discharged from the purification device; the liquid processing device is connected to the liquid outlet of the purification device, and the liquid processing device comprises a reboiler, and the reboiler comprises a reflux outlet, and the reflux outlet is connected to the discharge end of the purification device.

[0007] Furthermore, the drying mechanism includes a drying component and a reduction mechanism; the access end of the drying component is used to introduce the wellhead gas, and the gas outlet end of the drying component is connected to the purification device; the reduction mechanism is connected to the drying component.

[0008] Furthermore, the drying component includes at least two dryers; a plurality of the dryers are connected to the purification device, and a plurality of the dryers are respectively connected to the reduction mechanism.

[0009] Furthermore, the reduction mechanism includes a hot air conveying component and a dehydration component; the air outlet end of the hot air conveying component is connected to the air outlet ends of the multiple dryers, and a valve body is provided at the connection; the dehydration component is connected to the discharge ends of the multiple dryers.

[0010] Furthermore, the dehydration component includes a cooler and a dehydration element; the discharge end of the cooler is connected to the discharge ends of the plurality of dryers; the discharge end of the cooler is connected to the discharge inlet of the dehydration element, and the exhaust port of the dehydration element is connected to the access end of the drying component.

[0011] Furthermore, the liquid treatment device also includes a circulation pump; the input end of the circulation pump is connected to the liquid outlet of the purification device, the circulation pump has three output ends, and the three output ends are respectively a cooling output end, a purification end and a discharge end; the cooling output end is connected to the cooler, the purification end is connected to the reboiler, and the discharge end is used to discharge the finished carbon dioxide.

[0012] Furthermore, the gas processing device also includes a reflux tank and a reflux pump; the reflux tank is connected to the discharge end of the condenser; the discharge end of the reflux pump is connected to the liquid outlet end of the reflux tank, and the discharge end of the reflux pump is connected to the purification device.

[0013] Furthermore, the gas processing device also includes a precooler; the precooler is arranged between the condenser and the purification device, the purification device is connected to the condenser through the precooler, and the precooler is connected to the gas outlet end of the reflux tank.

[0014] Furthermore, the wellhead gas separation system also includes a filtering mechanism; the filtering mechanism includes a filter element and a gas-liquid separator; the filter element is arranged at the access end of the drying mechanism and\or between the discharge end of the purification device and the discharge end of the drying mechanism; the gas-liquid separator is arranged at the access end of the drying mechanism.

[0015] Furthermore, the filtering mechanism also includes a pressure reducing valve; the pressure reducing valve is connected to the filtering element.

[0016] Beneficial effects:

[0017] The wellhead gas separation system provided by the utility model includes a drying mechanism, a purification device, a gas processing device and a liquid processing device. The drying mechanism is used to receive the wellhead gas, and the wellhead gas is discharged after being dried by the drying mechanism. The discharge end of the purification device is connected to the discharge end of the drying mechanism. The gas processing device includes a condenser, which is connected to the purification device, and the condenser is used to condense the gas discharged by the purification device. The liquid processing device is connected to the liquid outlet of the purification device, and the liquid processing device includes a reboiler, and the reboiler includes a reflux outlet, and the reflux outlet is connected to the discharge end of the purification device.

[0018] Specifically, after use, the wellhead gas is passed into the drying mechanism of the utility model, the drying mechanism dehydrates and dries the wellhead gas and then discharges it to the purification device, the purification device diverts the wellhead gas, and the gas is discharged into the gas processing device, wherein the gas is condensed into liquid by the condenser and refluxed to the purification device, the liquid in the purification device is discharged into the liquid processing device, the reboiler in the liquid processing device heats the liquid discharged from the purification device to evaporate low-boiling-point liquids such as methane, thereby further purifying the liquid carbon dioxide, part of the purified liquid carbon dioxide is discharged to the outside, and part is refluxed to the purification device, mixed with the original wellhead gas condensate and purified again, the utility model has a wide adaptability to gas concentration range, the treated carbon dioxide liquid concentration is relatively high, and the process flow is simple, the public works consumption is small, the investment is low, and the operation is continuous and stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 A schematic diagram of the pipeline structure of a gas separation system provided in an embodiment of the utility model;

[0021] Figure 2 A schematic structural diagram of a gas separation system provided in an embodiment of the utility model.

[0022] icon:

[0023] 100 - drying mechanism; 110 - dryer; 120 - cooler; 130 - dehydration component; 140 - hot air conveying component; 150 - booster;

[0024] 200 - Purification unit;

[0025] 300 - liquid handling device; 310 - reboiler; 320 - circulation pump; 330 - cryogenic cooler;

[0026] 400 - gas processing device; 410 - condenser; 420 - reflux tank; 430 - reflux pump; 440 - precooler; 450 - cold air pressure reducing valve;

[0027] 500 - filtration mechanism; 510 - gas-liquid separation element; 520 - primary filter; 530 - fine filter; 540 - primary pressure reducing valve; 550 - secondary pressure reducing valve;

[0028] 600 - Ice machine. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0032] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply 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 on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0033] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0034] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] The present invention is further described in detail below through specific embodiments in conjunction with the accompanying drawings.

[0036] See also Figure 1 , Figure 2 The wellhead gas separation system provided in this embodiment includes a drying mechanism 100, a purification device 200, a gas processing device 400 and a liquid processing device 300.

[0037] The drying mechanism 100 is used to receive the wellhead gas, and the wellhead gas is discharged after being dried by the drying mechanism 100. The discharge end of the purification device 200 is connected to the discharge end of the drying mechanism 100. The gas processing device 400 includes a condenser 410, which is connected to the purification device 200. The condenser 410 is used to condense the gas discharged from the purification device 200. The liquid processing device 300 is connected to the liquid outlet of the purification device 200. The liquid processing device 300 includes a reboiler 310. The reboiler 310 includes a reflux outlet, and the reflux outlet is connected to the discharge end of the purification device 200.

[0038] After use, the wellhead gas is passed into the drying mechanism 100 of the utility model, and the drying mechanism 100 dehydrates and dries the wellhead gas and then discharges it to the purification device 200. The purification device 200 splits the wellhead gas and discharges the gas into the gas processing device 400. The gas is condensed into liquid by the condenser 410 and flows back to the purification device 200.

[0039] The liquid in the purification device 200 is discharged into the liquid treatment device 300. The reboiler 310 in the liquid treatment device 300 heats the liquid discharged from the purification device 200 to evaporate low-boiling-point liquids such as methane, thereby further purifying the liquid carbon dioxide.

[0040] The purified liquid carbon dioxide is partially discharged to the outside, and partially refluxed to the purification device 200, and is mixed with the liquid separated from the original wellhead gas and the gas condensate before being purified again. The wellhead gas separation system provided in this embodiment has a wide adaptability to the concentration of carbon dioxide in the gas, and can process gases with a carbon dioxide concentration of more than 35% and a pressure of more than 2.5MPag. The concentration of the purified carbon dioxide liquid is relatively high, reaching more than 99%. In addition, the wellhead gas separation system provided in this embodiment has a simple process flow, low utility consumption, low investment, and continuous and stable separation operation.

[0041] In this embodiment, the drying mechanism 100 includes a drying component and a reduction mechanism. The access end of the drying component is used to introduce wellhead gas, and the gas outlet end of the drying component is connected to the purification device 200. The reduction mechanism is connected to the drying component.

[0042] Specifically, the drying component in this embodiment uses a desiccant to dehydrate and dry the wellhead gas. After a certain period of use, the humidity of the desiccant is too high to be used any further. The desiccant can be reduced by heating or precipitation through a reduction mechanism to reduce the humidity of the desiccant. The reduced desiccant can be put back into use without replacement, and the reduction is convenient and can save investment.

[0043] In this embodiment, the drying assembly includes at least two dryers 110. The multiple dryers 110 are all connected to the purification device 200, and the multiple dryers 110 are respectively connected to the reduction mechanism.

[0044] Among them, the multiple dryers 110 in this embodiment are arranged in parallel, and each dryer 110 is individually connected to the purification device 200. When in use, it is convenient to use the dryers 110 individually or together.

[0045] Furthermore, after being used for a certain period of time, the dryer 110 can be switched, and the desiccant in the previously used dryer 110 can be restored by the restoration mechanism. During the restoration process, the previously unused dryer 110 performs the drying process. Drying and restoration are carried out simultaneously, and there is no need to interrupt the drying operation for restoration, thereby maintaining the continuity of system operation.

[0046] In this embodiment, the reduction mechanism includes a hot air delivery component 140 and a dehydration component. The hot air delivery component 140 has an outlet connected to the outlets of the multiple dryers 110, and a valve body is provided at the connection. The dehydration component is connected to the discharge inlet of the multiple dryers 110.

[0047] Specifically, the reduction mechanism in this embodiment reduces the desiccant by heating and drying. The hot air delivery component 140 introduces dry hot air into the dryer 110 to be reduced, dries the water in the desiccant in the dryer 110 and blows it out of the dryer 110 to reduce the desiccant.

[0048] Among them, after the hot air passes through the dryer 110, it absorbs water and becomes wet gas and is discharged to the dehydration component, and the dehydration component dehydrates the wet gas. Specifically, the hot gas conveying component 140 in this embodiment includes a heater, the air inlet end of the heater is connected to the air outlet end of each dryer 110, and a valve body is provided at the connection between the heater and the dryer 110 to control the opening and closing of the pipeline. When carbon dioxide gas needs to be introduced to reduce other dryers 110, the heater can be controlled to open in time to heat the dried gas, and the valve body can be controlled to open so that the heated gas can pass into the air outlet end of the dryer 110 to be reduced and be discharged from the discharge end to the dehydration component.

[0049] Furthermore, after the dehydration component dehydrates the moisture, it discharges the moisture to the outside, and discharges the dehydrated gas to the discharge end of the dryer 110 again, making full use of the wellhead gas and avoiding waste caused by discharging the gas to the outside.

[0050] In addition, valve bodies are provided at the connection between the outlet of each dryer 110 and the purification device 200 and at the connection between the air inlet of each dryer 110 and the wellhead gas. During the above-mentioned reduction process, the valve body between the outlet of the dryer 110 to be reduced and the purification device 200 is in a closed state, and the outlet of the dryer 110 to be reduced cannot discharge gas into the purification device 200. And the valve body at the connection between the dryer 110 to be reduced and the wellhead gas is also in a closed state, and the gas in the dryer 110 to be reduced cannot enter the input pipe of the wellhead gas, so that the dry gas can enter from the outlet of the dryer 110 to be reduced, and after passing through the dryer 110, it is discharged into the dehydration component from the air inlet of the dryer 110.

[0051] It should be noted that, in this embodiment, a water content analyzer is provided at the connection between the air outlet end of the drying mechanism 100 and the air inlet end of the purification tower. When the drying mechanism 100 is operating for drying, the multiple dryers 110 are not used at the same time, and some dryers 110 are drying. The state of the dryer 110 performing drying can be judged according to the reading of the water content analyzer. When the reading of the water content analyzer exceeds the preset value, it indicates that the water content in the discharged gas exceeds the standard, that is, the dryer 110 performing drying needs to be restored. At this time, the operating dryer 110 can be turned off and the idle dryer 110 can be started. Thereby, the restoration of the dryer 110 is achieved while the gas continues to be dried.

[0052] As an implementable method, the water content analyzer can be replaced by a timed restoration method. This method does not require the installation of a water content analyzer. When the wellhead gas is introduced into the wellhead gas separation system, the humidity of the wellhead gas is detected, and the use time of the single set of dryers 110 is set according to the detection result, such as switching the dryer 110 once every 8 hours, 12 hours, or 24 hours.

[0053] In this embodiment, the dehydration assembly includes a cooler 120 and a dehydration member 130. The discharge end of the cooler 120 is connected to the discharge ends of the plurality of dryers 110. The discharge end of the cooler 120 is connected to the discharge inlet of the dehydration member 130, and the exhaust port of the dehydration member 130 is connected to the access end of the drying assembly.

[0054] Specifically, a valve body is provided between the discharge end of the cooler 120 and the discharge end of each dryer 110 in this embodiment to control the opening and closing of the pipeline. The wet gas enters the cooler 120 for cooling, and the water is precipitated after cooling, and the wellhead gas and the water enter the dehydration element 130 together. After the dehydration element 130 discharges the water to the outside, the wellhead gas is discharged to the inlet end of the drying mechanism 100 again, and the wellhead gas enters the dryer 110 in a dry state, so as to avoid excessive discharge and waste of the treated gas.

[0055] In order to allow the wellhead gas discharged from the dehydration component 130 to smoothly enter the drying mechanism 100, a booster 150 is arranged between the dehydration component 130 and the drying mechanism 100 in this embodiment. The booster 150 can increase the air pressure of the wellhead gas separated by the dehydration component 130, so that the air pressure of the gas separated by the dehydration component 130 is increased to be close to the air pressure of the wellhead gas, so as to ensure that the wellhead gas discharged from the dehydration component 130 can be smoothly discharged into the drying mechanism 100 again.

[0056] Furthermore, it should be noted that, in the present embodiment, the dryer 110 in the drying process performs a drying operation on the wellhead gas to generate dry gas. When other dryers 110 are reduced, it is not necessary to pass all the dry gas into the dryer 110 in the reduction process. Only part of the dry gas is needed to achieve the reduction of the dryer 110.

[0057] In addition, a temperature detector is also provided in front of the cooler 120 of the present application, and the temperature detector can measure in real time the temperature of the gas entering the cooler 120. During the reduction process, since the dryer 110 to be reduced contains more water, the temperature of the reduction gas flowing out of the discharge end of the dryer 110 is relatively low. When the temperature of the temperature detector rises to a value exceeding the preset temperature, it means that the desiccant in the dryer 110 has been dried and has less water. The heater can be turned off to stop heating, the reduction action is completed, and the dryer 110 can be put into use again.

[0058] In this embodiment, the liquid treatment device 300 further includes a circulation pump 320. The input end of the circulation pump 320 is connected to the liquid outlet of the purification device 200, and the circulation pump 320 has three output ends, and the three output ends are respectively a cooling output end, a purification end, and a discharge end. The cooling output end is connected to the cooler 120, the purification end is connected to the reboiler 310, and the discharge end is used to discharge the finished carbon dioxide.

[0059] The purification device 200 in this embodiment is a purification tower. The wellhead gas enters the purification tower after being dried. The gaseous part of the wellhead gas flows upward in the purification tower, and the liquid is deposited at the bottom of the tower. The circulation pump 320 can extract the liquid at the bottom of the tower and discharge it in multiple ways. In this embodiment, the liquid is discharged in three ways according to the state of the liquid at the bottom of the tower.

[0060] Specifically, the cooling output end discharges the cryogenic liquid to the cooler 120 to provide a low temperature environment for the cooler 120, thereby realizing the cooling of the gas used for reduction. The liquid with lower purity is discharged from the purification end to the reboiler 310 for purification, and after purification, it is refluxed to the purification tower by the reboiler 310. The liquid carbon dioxide that meets the reuse requirements is discharged from the discharge end to the outside for storage or direct use. In addition, in this embodiment, the discharge end is connected to a cryogenic refrigerator 330. The cryogenic refrigerator 330 in this embodiment obtains a cold source through an ice machine 600 to cool the liquid discharged from the discharge end again. In addition, the condenser 410 in this embodiment is also connected to the ice machine 600 to obtain the cold source required for condensation.

[0061] In this embodiment, the gas processing device 400 further includes a reflux tank 420 and a reflux pump 430. The reflux tank 420 is connected to the discharge end of the condenser 410. The discharge end of the reflux pump 430 is connected to the liquid outlet end of the reflux tank 420, and the discharge end of the reflux pump 430 is connected to the purification device 200.

[0062] Specifically, the reflux tank 420 can store the liquid liquefied by the condenser 410. After the reflux pump 430 is connected to the reflux tank 420, the liquid stored in the reflux tank 420 can be refluxed and discharged into the purification tower, so that the liquefied carbon dioxide can be refluxed into the purification tower for reasonable utilization, and mixed with the liquid at the bottom of the tower and discharged in a branch channel.

[0063] In this embodiment, the gas processing device 400 further includes a precooler 440. The precooler 440 is disposed between the condenser 410 and the purification device 200. The purification device 200 is connected to the condenser 410 through the precooler 440. The precooler 440 is connected to the gas outlet end of the reflux tank 420.

[0064] The precooler 440 can cool the gas discharged from the purification device 200 once, thereby reducing the gas temperature, so that the temperature of the gas entering the condenser 410 is reduced, which is more convenient for condensation, thereby improving the condensation efficiency.

[0065] The gas in the reflux tank 420 is low-temperature gas after being cooled by the condenser 410. After the precooler 440 is connected to the gas outlet of the reflux tank 420, the low-temperature gas in the reflux tank 420 can flow to the precooler 440 as a low-temperature source for the precooler 440, and the low-temperature gas is discharged to the outside after heat exchange with the gas in the precooler 440, and the gas discharged from the purification tower to the precooler 440 is exchanged with the low-temperature gas and then flows into the condenser 410 for condensation.

[0066] Furthermore, in this embodiment, a cold air pressure reducing valve 450 is provided at the air outlet of the reflux tank 420. The gas in the reflux tank 420 will be cooled after being decompressed by the cold air pressure reducing valve 450, thereby increasing the temperature difference between the fluids on the cold and hot sides and being more conducive to heat exchange.

[0067] In this embodiment, the wellhead gas separation system further includes a filter mechanism 500. The filter mechanism 500 includes a filter element and a gas-liquid separator 510. The filter element is disposed between the access end of the drying mechanism 100 and the discharge end of the purification device 200 and the discharge end of the drying mechanism 100. The gas-liquid separator 510 is disposed at the access end of the drying mechanism 100.

[0068] The filter element in this embodiment filters the fluid flowing through each place through the filter element. The gas-liquid separator 510 can dehydrate the liquid in the wellhead gas, remove the moisture in the wellhead gas and discharge it to the outside, so as to avoid the wellhead gas entering the drying mechanism 100 containing too much moisture.

[0069] Specifically, the filter element in this embodiment includes a primary filter 520 and a fine filter 530. The primary filter 520 is provided on the pipeline of the drying mechanism 100 connected to the wellhead gas. The primary filter 520 can filter the particles carried in the incoming gas to reduce the wear of the subsequent system. The fine filter 530 in this embodiment is arranged between the discharge end of the drying mechanism 100 and the input end of the purification tower. The gas dried by the drying mechanism 100 is filtered by the fine filter 530 and then discharged into the purification tower. The fine filter 530 can filter the dried fluid to prevent particles and dust in the desiccant from entering the purification tower during the drying process to affect the purity of the product.

[0070] As an practicable manner, when the desiccant is a packaging agent or the product purity requirement is not high, only the primary filter 520 can be used to filter the wellhead gas without adding the fine filter 530. Similarly, when the dryer 110 or the gas-liquid separator can filter solids, the primary filter 520 can be omitted.

[0071] In this embodiment, the filter mechanism 500 further includes a pressure reducing valve, which is connected to the filter element.

[0072] Specifically, the pressure reducing valve in this embodiment includes a primary pressure reducing valve 540 and a secondary pressure reducing valve 550. The primary pressure reducing valve 540 is provided before the primary filter 520, and the primary pressure reducing valve 540 can reduce the gas pressure of the wellhead gas to avoid excessive pressure of the gas discharged into the primary filter 520 and the drying mechanism 100. The secondary pressure reducing valve 550 is used in conjunction with the fine filter 530, and accordingly, it can avoid excessive pressure of the gas discharged into the fine filter 530 and the purification tower.

[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in the field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model.

Claims

1. A wellhead gas separation system, characterized in that: include: A drying mechanism (100), a purification device (200), a gas processing device (400) and a liquid processing device (300); The drying mechanism (100) is used to receive wellhead gas, and the wellhead gas is discharged after being dried by the drying mechanism (100); The discharge end of the purification device (200) is connected to the discharge end of the drying mechanism (100); The gas processing device (400) comprises a condenser (410), the condenser (410) is connected to the purification device (200), and the condenser (410) is used to condense the gas discharged from the purification device (200); The liquid treatment device (300) is connected to the liquid outlet of the purification device (200), and the liquid treatment device (300) includes a reboiler (310). The reboiler (310) includes a reflux outlet, and the reflux outlet is connected to the discharge end of the purification device (200).

2. The wellhead gas separation system according to claim 1, characterized in that: The drying mechanism (100) comprises a drying component and a reduction mechanism; The access end of the drying component is used to introduce the wellhead gas, and the gas outlet end of the drying component is connected to the purification device (200); The reduction mechanism is connected to the drying component.

3. The wellhead gas separation system according to claim 2, characterized in that: The drying assembly includes at least two dryers (110); The plurality of dryers (110) are all connected to the purification device (200), and the plurality of dryers (110) are respectively connected to the reduction mechanism.

4. The wellhead gas separation system according to claim 3, characterized in that: The reduction mechanism includes a hot gas conveying component (140) and a dehydration component; The gas outlet end of the hot gas delivery component (140) is connected to the gas outlet ends of the plurality of dryers (110), and a valve body is provided at the connection; The dehydration assembly is connected to the discharge ends of the plurality of dryers (110).

5. The wellhead gas separation system according to claim 4, characterized in that: The dehydration assembly comprises a cooler (120) and a dehydration element (130); The discharge end of the cooler (120) is connected to the discharge ends of the plurality of dryers (110); The discharge end of the cooler (120) is connected to the discharge inlet of the dehydration component (130), and the exhaust port of the dehydration component (130) is connected to the access end of the drying component.

6. The wellhead gas separation system according to claim 5, characterized in that: The liquid treatment device (300) further comprises a circulation pump (320); The input end of the circulation pump (320) is connected to the liquid outlet of the purification device (200), and the circulation pump (320) has three output ends, and the three output ends are respectively a cooling output end, a purification end, and a discharge end; The cooling output end is connected to the cooler (120), the purification end is connected to the reboiler (310), and the discharge end is used to discharge finished carbon dioxide.

7. The wellhead gas separation system according to claim 1, characterized in that: The gas processing device (400) further includes a reflux tank (420) and a reflux pump (430); The reflux tank (420) is connected to the discharge end of the condenser (410); The discharge end of the reflux pump (430) is connected to the liquid outlet end of the reflux tank (420), and the discharge end of the reflux pump (430) is connected to the purification device (200).

8. The wellhead gas separation system according to claim 7, characterized in that: The gas processing device (400) further includes a precooler (440); The precooler (440) is arranged between the condenser (410) and the purification device (200), the purification device (200) is connected to the condenser (410) through the precooler (440), and the precooler (440) is connected to the gas outlet end of the reflux tank (420).

9. The wellhead gas separation system according to claim 1, characterized in that: The wellhead gas separation system further comprises a filtering mechanism (500); The filtering mechanism (500) comprises a filtering element and a gas-liquid separation element (510); The filter element is arranged between the access end of the drying mechanism (100) and / or the discharge end of the purification device (200) and the discharge end of the drying mechanism (100); The gas-liquid separation element (510) is arranged at the access end of the drying mechanism (100).

10. The wellhead gas separation system according to claim 9, characterized in that: The filtering mechanism (500) further includes a pressure reducing valve; The pressure reducing valve is connected to the filter element.

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