Multi-chamber casing gas recovery device and method

Abstract

The present invention discloses a multi-cavity casing gas recovery device and method, belonging to the technical field of extracting oil, gas, water, soluble or meltable substances or mineral slurry from a well; wherein the recovery device comprises a controller, a first casing, a second casing, a circulation pump, an air inlet pipe, an air outlet pipe, a one-way valve, an electric valve, an impurity filter, a first auxiliary pipe, a second auxiliary pipe, a heat conduction plate, a water removal casing and a clean gas main pipe, etc., wherein the inner cavity of one of the first casing and the second casing is filled with liquid, and the other is an empty pipe, and the liquid in the first casing and the second casing is driven to circulate back and forth by the circulation pump to realize the air suction and exhaust functions of the whole device; impurities in the casing gas are removed by the impurity filter, the water removal casing and the like, so as to reduce the influence of impurities in the recovered casing gas on the conveying pipeline; the present invention has stable operation, low maintenance cost, long service life, can be unattended for a long time, can also be standardized in production, skid-mounted on-site installation, and has strong adaptability.

Description

Technical Field

[0001] The present invention relates to a casing gas recovery device and method, in particular to a multi-cavity casing gas recovery device and method, belonging to the technical field of extracting oil, gas, water, soluble or fusible substances or mineral slurry from a well. Background Art

[0002] During the oilfield production process, when the pressure of the oil well drops to the bubble point pressure, natural gas will be separated from the crude oil. Part of the separated natural gas is brought to the ground with the oil, and the other part gathers in the annular space of the oil well casing, forming casing pressure and becoming oil well casing gas. When the oil well casing gas gathers to a certain pressure, the dynamic liquid level of the oil well will change, the dynamic liquid level will drop, the oil well production will decrease, and gas lock will occur in severe cases. The gas lock phenomenon causes the oil well to be unable to produce normally. The oil production area of ​​some oil fields uses venting and ignition to burn casing gas, which not only causes air pollution, but also wastes precious and non-renewable gas resources, forming a vicious cycle. Therefore, an oil well casing gas recovery device is proposed to recycle casing gas.

[0003] The existing oil well casing gas recovery mainly works through the compressor system or the pumping rod driven air pump system, and then the casing gas is pumped into the oil well gathering pipeline. The main problems are: 1. The casing gas composition is complex and contains condensate; 2. The compressor (including finished compressor or pump driven by the pumping rod) has many vulnerable parts, complex working conditions, and is difficult to maintain; 3. The oil well casing gas volume varies greatly and is difficult to adapt; 4. The cost and maintenance cost are high. In response to this, the prior art proposes another oil well casing gas recovery device, which is provided with two tank bodies, an empty tank and a tank filled with liquid, and then a circulating pump is used to connect the two tank bodies and alternately fill and discharge liquid, so that the two tank bodies alternately form a vacuum suction chamber and / or a compression discharge chamber, so as to realize the suction and exhaust functions of the whole device, so as to solve the problems that the production of different oil well casing gases varies greatly, the process medium is complex, and the compressor system is difficult to adapt to. For example: an oil well casing gas recovery device disclosed in the Chinese utility model patent with application number CN201720671830.6, a dual-chamber liquid reciprocating driven multiphase flow mixing device disclosed in the Chinese utility model patent with application number CN201821781135.6, a multiphase flow mixing device disclosed in the Chinese utility model patent with application number CN202023279600.6, and the like.

[0004] However, the above technical solution only performs simple suction and exhaust functions on the casing gas, and directly returns the casing gas to the oil well gathering pipeline without preliminary treatment. The existing casing gas in China usually contains impurities and a large amount of water, especially the casing gas transported by the above device. The moisture content will be further increased. If it is not treated, there is a problem of increasing impurities in subsequent pipelines. The Chinese utility model patent with application number CN201821840204.6 discloses a casing gas recovery device, which recycles and processes the casing gas, separates the moisture in the casing gas during the recovery process, and avoids excessive moisture from affecting the subsequent pipeline transportation process; but it reduces the casing gas recovery space by dividing the inner cavity of the recovery tank and setting a moisture separation structure, and the moisture separation effect is not good. Summary of the invention

[0005] (I) Technical problems to be solved: The technical problems to be solved by the present invention are to solve the problems of low efficiency of existing oil well casing gas recovery, easy loss of compressor, high maintenance and production cost, low reliability, short life, and more impurities in the recovered casing gas.

[0006] (II) Technical solution: In order to solve the above technical problems, the present invention provides a multi-cavity casing gas recovery device, including a controller, a first casing, a second casing, a circulation pump, an air inlet pipe, an air outlet pipe, a one-way valve and an electric valve, wherein the inner cavity of one of the first casing and the second casing is filled with liquid, and the other is an empty pipe, an air inlet pipe and an air outlet pipe are arranged between the upper ends of the first casing and the second casing, an air inlet pipe is arranged on the air inlet pipe, an air outlet pipe is arranged on the air outlet pipe, and the air inlet pipe is respectively connected to the air inlet pipe between the upper ends of the first casing and the second casing. A one-way valve is arranged on the air outlet pipe between the exhaust pipe and the upper ends of the first sleeve and the second sleeve respectively, the lower ends of the first sleeve and the second sleeve are respectively connected with the liquid inlet end of the circulation pump, and are also respectively connected with the liquid outlet end of the circulation pump, and electric valves are arranged on the connecting pipelines of the first sleeve and the second sleeve respectively with the liquid inlet end of the circulation pump and the connecting pipelines of the first sleeve and the second sleeve respectively with the liquid outlet end of the circulation pump, the electric valve is electrically connected to the controller, and the circulation pump drives the liquid in the first sleeve and the second sleeve to circulate back and forth to realize the suction and exhaust functions of the whole device.

[0007] The utility model also comprises an impurity filter, a first auxiliary pipe, a second auxiliary pipe, a heat conducting plate, a water removal sleeve and a clean gas main pipe.

[0008] An impurity filter is arranged on the air inlet pipe, a plurality of first auxiliary pipes are arranged around the first sleeve pipe, and a plurality of second auxiliary pipes are arranged around the second sleeve pipe, the upper and lower ends of the first auxiliary pipe are respectively communicated with the upper and lower ends of the first sleeve pipe, the upper and lower ends of the second auxiliary pipe are respectively communicated with the upper and lower ends of the second sleeve pipe, a dewatering sleeve is respectively arranged in the gap between the first sleeve pipe and the first auxiliary pipe and in the gap between the second sleeve pipe and the second auxiliary pipe, the dewatering sleeve at the first sleeve pipe is fixed to the first sleeve pipe and the first auxiliary pipe through a heat conducting plate, and the dewatering sleeve at the second sleeve pipe is fixed to the second sleeve pipe and the second auxiliary pipe through a heat conducting plate, two exhaust branch pipes are extended from one end of the exhaust pipe away from the exhaust pipe, and the two exhaust branch pipes are respectively communicated with the two sets of dewatering sleeves, an electric valve electrically connected to the controller is arranged on the exhaust branch pipe, a clean air branch pipe is arranged at the outlet end of the dewatering sleeve, the clean air branch pipe is communicated with the clean air main pipe, a one-way valve is arranged on the clean air branch pipe, a water storage pipe and an emptying pipe are arranged on the dewatering sleeve, and an electric valve electrically connected to the controller is arranged on the emptying pipe.

[0009] Furthermore, the dewatering sleeve at the first sleeve includes a vertical pipe, a main connecting pipe and a secondary connecting pipe. A vertical pipe is arranged between each first secondary pipe and the first sleeve, and heat conducting plates are respectively arranged on both sides of the vertical pipe to be connected with the first secondary pipe and the first sleeve. A main connecting pipe is used to connect two adjacent vertical pipes. The main connecting pipes are alternately arranged at the upper and lower ends of the dewatering sleeve to form a cage-shaped coil structure. A secondary connecting pipe is arranged between the two vertical pipes in the lower part of the dewatering sleeve corresponding to the main connecting pipe at the lower end of the dewatering sleeve. The dewatering sleeve structure at the second sleeve is the same as the dewatering sleeve structure at the first sleeve.

[0010] Furthermore, a drain pipe is provided on the main connecting pipe at the lower end of the dewatering sleeve, one end of the drain pipe is connected to the main connecting pipe, and the other end is connected to the first sleeve or the second sleeve. At this time, the vertical pipe under the secondary connecting pipe and the corresponding main connecting pipe are water storage pipes.

[0011] Furthermore, a bus bar is arranged in the vertical tube, the bus bar is fixed on the inner wall of the vertical tube, and dense moisture separation teeth are arranged on the bus bar, and the moisture separation teeth are arranged obliquely.

[0012] Furthermore, the bus bar is a spiral plate arranged in the vertical tube or a plurality of rectangular plates arranged in an array along the circumferential direction of the inner wall of the vertical tube.

[0013] Furthermore, the main connecting pipe and the auxiliary connecting pipe are both straight pipes or arc-shaped pipes. If they are arc-shaped pipes, their arching direction is set horizontally.

[0014] Furthermore, the first sleeve and the second sleeve are respectively provided with liquid level gauges, and the liquid level gauges are electrically connected to the controller.

[0015] Furthermore, the recovery device also includes a first beam seat tube, a first beam seat branch tube, a second beam seat tube and a second beam seat branch tube. The first beam seat tube is arranged at the lower end of the first sleeve, and the second beam seat tube is arranged at the lower end of the second sleeve. The first sleeve and the first beam seat tube, the second sleeve and the second beam seat tube form an inverted T-shaped structure respectively. The two ends of the first beam seat tube are connected to the liquid inlet end and the liquid outlet end of the circulation pump respectively through the first beam seat branch tube, and the two ends of the second beam seat tube are connected to the liquid inlet end and the liquid outlet end of the circulation pump respectively through the second beam seat branch tube. Electric valves are respectively arranged on the first beam seat branch tube and the second beam seat branch tube, and joint pipes are respectively arranged at the two ends of the first beam seat tube and the second beam seat tube, and valves are arranged on the joint pipes.

[0016] Furthermore, the recycling device also includes a base and a vertical frame. The vertical frame is arranged on the base. The circulation pump, the impurity filter, the first beam seat, the second beam seat and the controller are respectively installed on the base and located in the vertical frame.

[0017] The present invention also provides a method for recovering casing gas using the multi-chamber casing gas recovery device, which comprises the following steps:

[0018] S1. Fill the first casing and the first auxiliary pipe with liquid, connect the casing to the air pipe, and start the equipment;

[0019] S2, the circulation pump starts to work, the controller opens the electric valve on the pipeline connecting the first sleeve and the liquid inlet end of the circulation pump, and the electric valve on the pipeline connecting the second sleeve and the liquid outlet end of the circulation pump, and at the same time opens the electric valve on the exhaust branch connected to the dewatering sleeve at the first sleeve, so as to transport the liquid in the first sleeve and the first auxiliary pipe to the second sleeve and the second auxiliary pipe; as the liquid in the first sleeve and the first auxiliary pipe gradually decreases, the sleeve gas is supplemented into the first sleeve and the first auxiliary pipe through the air pipe, the impurity filter, the air inlet pipe and the one-way valve to form the air intake; at the same time, the liquid in the second sleeve and the second auxiliary pipe rises, and the gas in the cavity is gradually compressed and discharged to form the air outlet;

[0020] S3. When the liquid in the first sleeve and the first sub-pipe is transported to the second sleeve and the second sub-pipe and reaches the set value or the set time, the controller closes the electric valve on the pipeline connecting the first sleeve and the liquid inlet end of the circulation pump, the electric valve on the pipeline connecting the second sleeve and the liquid outlet end of the circulation pump, and the electric valve on the exhaust branch connected to the dewatering sleeve at the first sleeve, and then opens the electric valve on the pipeline connecting the first sleeve and the liquid outlet end of the circulation pump, the electric valve on the pipeline connecting the second sleeve and the liquid inlet end of the circulation pump, and the electric valve on the exhaust branch connected to the dewatering sleeve at the second sleeve, so as to transport the liquid in the second sleeve and the second sub-pipe to the first sleeve and the first sub-pipe; as the liquid in the second sleeve and the second sub-pipe gradually decreases, the sleeve gas is supplemented into the second sleeve and the second sub-pipe through the air pipe, the impurity filter, the air inlet pipe and the one-way valve to form air intake and absorb heat; at the same time, the liquid in the first sleeve and the first sub-pipe rises, and the sleeve gas in the cavity is gradually compressed and discharged to form air outlet and release heat;

[0021] S4, the casing gas coming out of the first casing and the first auxiliary pipe enters the water removal casing at the second casing through the outlet pipe, the exhaust pipe, the exhaust branch pipe and the electric valve, and then passes through the clean gas branch pipe, the one-way valve and the clean gas main pipe before being discharged;

[0022] S5. The liquid is continuously transferred back and forth between the first casing and the second casing, so as to realize the continuous inflow, outflow and recovery of casing gas.

[0023] (III) Beneficial effects: The above technical solution of the present invention has the following advantages:

[0024] The present invention sets a first casing, a second casing and a circulating pump, etc., and then uses the circulating pump to connect the first casing and the second casing and alternately fill and discharge liquid, so that the first casing and the second casing alternately form a vacuum suction chamber and / or a compression discharge chamber, and realize the suction and exhaust functions of the whole device to solve the problems of large changes in gas production of different oil well casings, complex process media, and difficulty in adapting the compressor system. The working medium of the present invention is liquid (such as water), which is less dangerous; the first casing, the second casing and the circulating pump are matched, and the production parameters can be flexibly designed according to the gas production of the oil well casing; the circulating pump (water pump) is easier to maintain than the compressor.

[0025] The present invention arranges an impurity filter at the gas inlet pipe to filter out mud, mechanical impurities, etc. carried by the casing gas; at the same time, a dewatering casing is arranged to separate the moisture in the casing gas and then discharge it (generally discharged to the oil well gas gathering pipeline), which can prevent the impurities and moisture in the casing gas from affecting the subsequent pipeline transportation process.

[0026] The present invention utilizes the heat absorption during the casing air intake process to assist the water removal casing to quickly separate the water in the casing gas, so that the water separation effect is better and the water removal is more sufficient. The present invention has stable operation, low maintenance cost, long service life, and can be unattended for a long time.

[0027] The present invention can be produced in a standardized manner and installed on site in a skid-mounted manner, so the movement of the device is convenient and the adaptability is strong.

[0028] In addition to the technical problems solved by the present invention, the technical features of the technical solutions constituted by the present invention, and the advantages brought about by the technical features of these technical solutions described above, other technical features of the present invention and the advantages brought about by these technical features will be further explained in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 This is one of the isometric diagrams of the recovery device disclosed in the present invention.

[0031] Figure 2 This is a schematic diagram of an axonometric view from another angle of the recovery device disclosed in the present invention.

[0032] Figure 3 It is a schematic diagram of the front view of the present invention.

[0033] Figure 4 It is a schematic diagram of the rear view of the present invention.

[0034] Figure 5 It is a schematic side view of the present invention.

[0035] Figure 6 It is a schematic diagram of the structure of the present invention after the base and the frame are hidden.

[0036] Figure 7 for Figure 6 Schematic diagram of the structure after further hiding some components.

[0037] Figure 8 It is a schematic diagram of assembling the water removal casing and related parts of the present invention.

[0038] Fig. 9 for Figure 8 Schematic diagram of top view.

[0039] Fig.10 for Figure 8 Schematic diagram of the structure after hiding the heat conduction plate, etc.

[0040] Fig.11 It is a schematic cross-sectional view of the vertical pipe of the present invention.

[0041] Fig.12 for Fig.11 Enlarged schematic diagram of part A.

[0042] Fig.13 It is a schematic diagram of a side view (or top view) of the vertical pipe of the present invention.

[0043] In the figure: 1, controller; 2, first sleeve; 3, second sleeve; 4, circulation pump; 5, air inlet pipe; 6, air outlet pipe; 7, one-way valve; 8, electric valve; 9, air inlet pipe; 10, exhaust pipe; 11, impurity filter; 12, first auxiliary pipe; 13, second auxiliary pipe; 14, heat conduction plate; 15, water removal sleeve; 16, clean air main pipe; 17, exhaust branch pipe; 18, clean air branch pipe; 19, drain pipe; 20, vertical pipe; 21, main connecting pipe; 22, auxiliary connecting pipe; 23, bus bar; 24, moisture separation teeth; 25, liquid level gauge; 26, first beam seat pipe; 27, first beam seat branch pipe; 28, second beam seat pipe; 29, second beam seat branch pipe; 30, joint pipe; 31, valve; 32, base; 33, vertical frame. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. 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.

[0045] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" 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.

[0046] Example 1: Figure 1-Figure 7As shown, a multi-cavity casing gas recovery device includes a controller 1, a first casing 2, a second casing 3, a circulation pump 4, an air inlet pipe 5, an air outlet pipe 6, a one-way valve 7 and an electric valve 8. The inner cavity of one of the first casing 2 and the second casing 3 is filled with liquid, which can be water, and the other is an empty pipe. An air inlet pipe 5 and an air outlet pipe 6 are arranged between the upper ends of the first casing 2 and the second casing 3, and the two share an air inlet pipe 5 and an air outlet pipe 6. An air inlet pipe 9 is arranged on the air inlet pipe 5, and a flange is arranged at the free end of the air inlet pipe 9 for connecting to the oil well casing gas delivery pipe; an exhaust pipe 10 is arranged on the air outlet pipe 6. A one-way valve 7 is provided on the air inlet pipe 5 between the air inlet pipe 9 and the upper ends of the first sleeve pipe 2 and the second sleeve pipe 3, respectively. A one-way valve 7 is provided on the air outlet pipe 6 between the air outlet pipe 10 and the upper ends of the first sleeve pipe 2 and the second sleeve pipe 3, respectively. By providing the one-way valve 7, the air inlet pipe 5 can only take air into the first sleeve pipe 2 and the second sleeve pipe 3, and the air outlet pipe 10 can only discharge the gas in the first sleeve pipe 2 and the second sleeve pipe 3. The lower ends of the first sleeve pipe 2 and the second sleeve pipe 3 are respectively connected to the liquid inlet end of the circulation pump 4, and are also respectively connected to the liquid outlet end of the circulation pump 4. An electric valve 8 is provided on the connecting pipelines of the first sleeve pipe 2 and the second sleeve pipe 3 and the liquid inlet end of the circulation pump 4, respectively, and the connecting pipelines of the first sleeve pipe 2 and the second sleeve pipe 3 and the liquid outlet end of the circulation pump 4, respectively. The electric valve 8 is electrically connected to the controller 1, and the on-off of the electric valve 8 can be controlled by the controller 1. The controller 1 at least includes a control module that can control when any electric valve 8 is turned on and off, a human-computer interaction module for staff settings, a display module for convenient observation of the operating status, a communication module for remote monitoring, and a storage module for storing operating records, etc., to realize the intelligence of the device, the device is fully automatically controlled, the data can be transmitted remotely, and the recovery device can be operated on terminals such as mobile phones. Flow sensors, pressure sensors, and temperature sensors can be set to automatically detect the casing gas production and pressure and temperature parameters, which is convenient for the implementation of intelligent casing gas recovery. The circulating pump 4 drives the liquid in the first casing 2 and the second casing 3 to circulate back and forth to realize the suction and exhaust functions of the whole device. The device can better cope with complex multi-phase medium transportation. The above are all prior arts and will not be described in detail.

[0047] The casing gas recovery device provided in this embodiment also includes an impurity filter 11, a first auxiliary pipe 12, a second auxiliary pipe 13, a heat conducting plate 14, a water removal casing 15 and a clean gas main pipe 16. The impurity filter 11 is arranged on the incoming gas pipe 9, which is mainly used to filter solid impurities. A sewage pipe is arranged at the lower end thereof, and a control valve is arranged on the sewage pipe. The impurity filter 11 can be purchased from existing products on the market. Six first auxiliary pipes 12 are arranged around the first casing 2, and the first auxiliary pipes 12 are arranged in a circumferential array around the first casing 2. Six second auxiliary pipes 13 are arranged around the second casing 3, and the second auxiliary pipes 13 are arranged in a circumferential array around the second casing 3. The upper and lower ends of the first auxiliary pipe 12 are respectively connected to the upper and lower ends of the first casing 2, and the upper and lower ends of the second auxiliary pipe 13 are respectively connected to the upper and lower ends of the second casing 3. By arranging a plurality of auxiliary pipes outside the casing, the volume for accommodating the casing gas can be increased, the frequency of the liquid reversing flow cycle between the two casings can be extended, and the frequent reversing can be reduced, which is more helpful in protecting the equipment and facilitating the recovery of the casing gas. The use of a plurality of tube bundles in a coordinated structure instead of increasing the volume of the casing does not require a complicated pressure vessel design, and is more convenient to design, install and use. In addition, this structure is more conducive to heat dissipation during the compression and exhaust process.

[0048] A dewatering sleeve 15 is respectively arranged in the gap between the first sleeve 2 and the first auxiliary pipe 12, and in the gap between the second sleeve 3 and the second auxiliary pipe 13. The dewatering sleeve 15 at the first sleeve 2 is fixed to the first sleeve 2 and the first auxiliary pipe 12 through a heat conducting plate 14, and the dewatering sleeve 15 at the second sleeve 3 is fixed to the second sleeve 3 and the second auxiliary pipe 13 through a heat conducting plate 14. It can be understood that the above device has two processes in the process of sleeve gas recovery, namely, compression exhaust and vacuum or negative pressure suction. Heat is released during compression exhaust, so a tube bundle structure needs to be arranged to facilitate heat dissipation. At the same time, heat is absorbed during negative pressure suction, so it can be used to cool the dewatering sleeve 15, accelerate the condensation of water in the sleeve gas compressed and discharged in the sleeve, and remove the water in the sleeve gas. Two exhaust branch pipes 17 extend from one end of the exhaust pipe 10 away from the air outlet pipe 6. The two exhaust branch pipes 17 are respectively connected to two sets of dewatering sleeves 15. The exhaust branch pipes 17 are provided with electric valves 8 electrically connected to the controller 1. The outlet end of the dewatering sleeve 15 is provided with a clean gas branch pipe 18. The clean gas branch pipe 18 is connected to the clean gas main pipe 16. The clean gas branch pipe 18 is provided with a one-way valve 7. The dewatering sleeve 15 is provided with a water storage pipe and an emptying pipe 19. The water storage pipe is used to temporarily store the water separated from the sleeve gas. The emptying pipe 19 is provided with an electric valve 8 electrically connected to the controller 1 (it is different from the electric valve 8 in the previous text only in specifications, so it looks different in the attached drawings, but they are both conventional electric valves. Of course, the first electric valve and the second electric valve can also be used to distinguish the two). The water in the water storage pipe can be discharged through the emptying pipe 19.

[0049] The above-mentioned water removal casing 15 can be in the form of a multi-tube bundled tube with air intake at the bottom and air outlet at the top; it can be in the form of a coil circulation; it can also be in the form of a spiral tube (spirally arranged around and close to the outer wall of the casing and the outer wall of the auxiliary tube).

[0050] Embodiment 2: This embodiment is based on the embodiment 1, and further optimizes and refines the structure of the water removal sleeve 15. Specifically, this embodiment selects to set the water removal sleeve 15 in the form of a coil circulation, such as Figure 8-Figure 10 shown.

[0051] The dewatering sleeve 15 at the first sleeve 2 includes a vertical pipe 20, a main connecting pipe 21 and a secondary connecting pipe 22. A vertical pipe 20 is arranged between each first secondary pipe 12 and the first sleeve 2, and heat conducting plates 14 are respectively arranged on both sides of the vertical pipe 20 to connect with the first secondary pipe 12 and the first sleeve 2, and the heat conducting plates 14 are selected from metal plates. A main connecting pipe 21 is used to connect two adjacent vertical pipes 20, and the main connecting pipes 21 are alternately arranged at the upper and lower ends of the dewatering sleeve 15 to form a cage-shaped coil structure. A secondary connecting pipe 22 is arranged between the two vertical pipes 20 corresponding to the main connecting pipe 21 arranged at the lower end of the dewatering sleeve 15 in the middle and lower part of the dewatering sleeve 15. When liquid is accumulated in the main connecting pipe 21 at the lower end of the dewatering sleeve 15, the sleeve gas is circulated by the secondary connecting pipe 22. The dewatering sleeve 15 structure at the second sleeve 3 is the same as the dewatering sleeve 15 structure at the first sleeve 2.

[0052] In this embodiment, a drain pipe 19 is provided on the main connecting pipe 21 at the lower end of the water removal sleeve 15. One end of the drain pipe 19 is connected to the main connecting pipe 21, and the other end is connected to the corresponding first sleeve 2 or the second sleeve 3. At this time, the vertical pipe 20 under the auxiliary connecting pipe 22 and the corresponding main connecting pipe 21 are water storage pipes, which are used to temporarily store the separated water. After storing a certain amount of water, it is discharged into the corresponding first sleeve 2 or the second sleeve 3 to replenish the liquid volume therein for recycling.

[0053] Embodiment 3: This embodiment is based on Embodiment 2, and further optimizes and refines the structure of the vertical pipe 20, specifically: Figure 11-13 As shown, a bus bar 23 is provided in the vertical pipe 20, and the bus bar 23 is fixed on the inner wall of the vertical pipe 20 to increase the contact area between the casing gas and the inner wall of the vertical pipe 20, which is convenient for the rapid condensation of moisture. The bus bar 23 is provided with dense moisture separation teeth 24, and the moisture separation teeth 24 are inclined to further accelerate the condensation and flow of moisture.

[0054] In this embodiment, the bus bar 23 can be a spiral plate arranged in the vertical tube 20 or a plurality of rectangular plates arranged in a circumferential array along the inner wall of the vertical tube 20, preferably a plurality of rectangular plates or rectangular bars welded and fixed in a circumferential array along the inner wall of the vertical tube 20, and dense moisture separation teeth 24 are arranged on the rectangular bars.

[0055] Embodiment 4: This embodiment is based on Embodiment 3, and further optimizes and refines the structure of the water removal sleeve 15. Specifically, the main connecting pipe 21 and the auxiliary connecting pipe 22 are both straight pipes or arc-shaped pipes. If they are arc-shaped pipes, their arching directions are set horizontally. Another setting method is: the arching directions of the main connecting pipes 21 at the upper and lower ends of the water removal sleeve 15 are set upward and downward respectively, and the arching direction of the auxiliary connecting pipe 22 is set horizontally. It is only necessary to prevent the separated water from clogging the auxiliary connecting pipe 22 and keep the sleeve gas flowing smoothly.

[0056] Embodiment 5: This embodiment is based on Embodiment 4, and further optimizes and refines the structure of the recovery device, specifically: the multi-chamber casing gas recovery device described in this embodiment, the first casing 2 and the second casing 3 are respectively provided with a liquid level gauge 25, the two ends of the liquid level gauge 25 are respectively connected to the upper and lower ends of the corresponding first casing 2 or second casing 3, and the liquid level gauge 25 is electrically connected to the controller 1. The installation of the liquid level gauge 25 is more convenient for the intelligent control of the casing gas recovery process.

[0057] Embodiment 6: This embodiment is based on the embodiment 5, and further optimizes and refines the structure of the recovery device, specifically: the multi-chamber casing gas recovery device described in this embodiment also includes a first beam seat tube 26, a first beam seat branch tube 27, a second beam seat tube 28 and a second beam seat branch tube 29, the first casing 2 is provided with a first beam seat tube 26 at the lower end, the second casing 3 is provided with a second beam seat tube 28 at the lower end, the first casing 2 and the first beam seat tube 26, the second casing 3 and the second beam seat tube 28 respectively form an inverted T-shaped structure. The two ends of the first beam seat tube 26 are respectively connected to the liquid inlet and liquid outlet of the circulation pump 4 through the first beam seat branch tube 27, the two ends of the second beam seat tube 28 are respectively connected to the liquid inlet and liquid outlet of the circulation pump 4 through the second beam seat branch tube 29, the first beam seat branch tube 27 and the second beam seat branch tube 29 are respectively provided with electric valves 8, and when working, the liquid in the casing flows in a Z-shaped manner along the corresponding beam seat tube, beam seat branch tube and circulation pump 4. Joint pipes 30 are respectively provided at both ends of the first beam seat tube 26 and the second beam seat tube 28 (in the corresponding drawings, the joint pipe 30 at one end of the first beam seat tube 26 or the second beam seat tube 28 is not shown), and the joint pipe 30 is respectively connected to both ends of the first beam seat tube 26 or the second beam seat tube 28 through flange plates. A valve 31 is provided on the joint pipe 30, which can be used to replenish or discharge liquid.

[0058] Embodiment 7: This embodiment is based on Embodiment 6, and further optimizes and refines the structure of the recovery device, specifically: the multi-chamber casing gas recovery device described in this embodiment also includes a base 32 and a vertical frame 33, the vertical frame 33 is arranged on the base 32, and the circulation pump 4, the impurity filter 11, the first beam seat, the second beam seat and the controller 1 are respectively installed on the base 32 and located in the vertical frame 33. Standardized production and skid-mounted on-site installation can be achieved, which is convenient for the movement of the device and has strong adaptability. In this embodiment, the base 32 is welded with channel steel, and the vertical frame 33 is welded with rectangular tubes.

[0059] Embodiment 8: Based on the above embodiment, this embodiment provides a method for recovering casing gas using the above recovery device, which comprises the following steps:

[0060] S1. Fill the first sleeve 2 and the first auxiliary pipe 12 with liquid (or fill them to a specified volume height, such as 9 / 10 of the height of the first sleeve 2 and the first auxiliary pipe 12), keep the second sleeve 3 and the second auxiliary pipe 13 empty (or fill the second sleeve 3 and the second auxiliary pipe 13 with liquid, and keep the first sleeve 2 and the first auxiliary pipe 12 empty, the same below), connect the sleeves to the air pipe 9, and start the equipment;

[0061] S2, the circulation pump 4 starts to work, the controller 1 opens the electric valve 8 on the pipeline connecting the first sleeve 2 and the liquid inlet end of the circulation pump 4, and the electric valve 8 on the pipeline connecting the second sleeve 3 and the liquid outlet end of the circulation pump 4, and at the same time opens the electric valve 8 on the exhaust branch pipe 17 connected to the dewatering sleeve 15 at the first sleeve 2, and the circulation pump 4 transports the liquid in the first sleeve 2 and the first sub-pipe 12 to the second sleeve 3 and the second sub-pipe 13; as the liquid in the first sleeve 2 and the first sub-pipe 12 gradually decreases, the sleeve gas is supplemented into the first sleeve 2 and the first sub-pipe 12 through the air pipe 9, the impurity filter 11, the air intake pipe 5 and the one-way valve 7, forming intake air and absorbing heat; at the same time, the liquid in the second sleeve 3 and the second sub-pipe 13 rises, and the gas in the cavity is gradually compressed and discharged, forming exhaust air (air in the initial state, and sleeve gas after the next cycle), and releasing heat. The airflow from the second casing 3 and the second auxiliary pipe 13 passes through the outlet pipe 6, the exhaust pipe 10, the exhaust branch pipe 17 and the electric valve 8, and then enters the water removal casing 15 at the first casing 2, and then passes through the clean air branch pipe 18, the one-way valve 7 and the clean air main pipe 16 before being discharged;

[0062] S3, when the liquid in the first sleeve pipe 2 and the first auxiliary pipe 12 is transported to the second sleeve pipe 3 and the second auxiliary pipe 13 and reaches the set value (the liquid level change is monitored by the liquid level meter 25, and the purpose of switching on and off after the liquid delivery amount is sufficient can also be achieved by setting the delivery time), the controller 1 closes the electric valve 8 on the pipeline connecting the first sleeve pipe 2 and the liquid inlet end of the circulation pump 4, the electric valve 8 on the pipeline connecting the second sleeve pipe 3 and the liquid outlet end of the circulation pump 4, and the electric valve 8 on the exhaust branch pipe 17 connected to the dewatering sleeve 15 at the first sleeve pipe 2, and then opens the electric valve 8 on the pipeline connecting the first sleeve pipe 2 and the liquid outlet end of the circulation pump 4, and the electric valve 8 on the pipeline connecting the second sleeve pipe 3 and the circulation pump 4. The liquid inlet end of the ring pump 4 is connected to the electric valve 8 on the pipeline and the electric valve 8 on the exhaust branch pipe 17 connected to the dewatering sleeve 15 at the second sleeve 3, and the liquid in the second sleeve 3 and the second sub-pipe 13 is transported to the first sleeve 2 and the first sub-pipe 12 in a reverse direction; as the liquid gradually decreases in the second sleeve 3 and the second sub-pipe 13, the sleeve gas is replenished into the second sleeve 3 and the second sub-pipe 13 through the air pipe 9, the impurity filter 11, the air inlet pipe 5 and the one-way valve 7 to form intake air and absorb heat; at the same time, the liquid in the first sleeve 2 and the first sub-pipe 12 rises, and the sleeve gas in the cavity is gradually compressed and discharged to form exhaust air and release heat;

[0063] S4, the casing gas coming out of the first casing 2 and the first auxiliary pipe 12 enters the dewatering casing 15 at the second casing 3 through the outlet pipe 6, the exhaust pipe 10, the exhaust branch pipe 17 and the electric valve 8, and flows in the dewatering casing 15. During the circulation process, the heat is taken away by the second casing 3 and the second auxiliary pipe 13 in the heat absorption state, and the moisture in the casing gas is separated. Then the casing gas passes through the clean gas branch pipe 18, the one-way valve 7 and the clean gas main pipe 16 and is discharged;

[0064] S5. The liquid is continuously transferred back and forth between the first casing 2 and the second casing 3 in this way, so as to realize the continuous inflow, outflow and recovery of casing gas.

[0065] In the above-mentioned casing gas recovery process, the water separated from the water-removing casing 15 is temporarily stored in the water storage pipe. Each time the liquid between the casings changes direction, the electric valve 8 on the corresponding drain pipe 19 is opened to allow the water accumulated in the water storage pipe to flow into the casing, thereby replenishing the liquid consumed in the casing and emptying the liquid in the water storage pipe. The specific operation method can be: when the device is in the initial state of operation, liquid of nine-tenths of the casing height is filled into the casing and the auxiliary pipe on one side, and the other side is an empty pipe. During the circulation operation, each time the liquid changes direction, the liquid in the casing and the auxiliary pipe on one side is first transported to the casing and the auxiliary pipe on the other side, and then the controller 1 opens the electric valve 8 on all the emptying pipes 19 on the water removal casing 15 at the casing on one side that has been emptied, and the liquid in the water storage pipe is input into the casing and the auxiliary pipe on the other side. When the liquid level meter 25 detects that the liquid level in the casing on the other side is not changing, the controller 1 closes the electric valve 8 on all the emptying pipes 19 on the water removal casing 15 at the casing on the other side that has been emptied, and each time the liquid changes direction, the operation is repeated. After a period of time, if the liquid level meter 25 detects that the liquid in the casing on one side has filled the entire casing, the casing is drained to restore the liquid level in it to nine-tenths of the casing height, and it can continue to be put into use.

[0066] In order to fully separate the moisture in the casing gas, a gas-liquid separation pipe (not shown in the drawings, existing technology can be used) can be set on the clean gas main pipe 16, and a baffle (existing technology) can be set in the gas-liquid separation pipe, and a drain pipe and a valve can be set at the lower end of the gas-liquid separation pipe.

[0067] In addition, in the description of the invention, unless otherwise specified, the terms "multiple", "multiple roots", "multiple groups" are used to mean two or more than two, and "several", "several roots", "several groups" are used to mean one or more than one. In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention 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 invention. In addition, the terms "first", "second", and "third" are used only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0068] The specific implementation modes of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above implementation modes, and various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of the present invention.

Claims

1. A multi-cavity casing gas recovery device, comprising a controller (1), a first casing (2), a second casing (3), a circulation pump (4), an air inlet pipe (5), an air outlet pipe (6), a one-way valve (7) and an electric valve (8), wherein the inner cavity of one of the first casing (2) and the second casing (3) is filled with liquid, and the other is an empty pipe, an air inlet pipe (5) and an air outlet pipe (6) are arranged between the upper ends of the first casing (2) and the second casing (3), an air inlet pipe (9) is arranged on the air inlet pipe (5), an air outlet pipe (10) is arranged on the air outlet pipe (6), and the one-way valve (7) is arranged on the air inlet pipe (9) and the air inlet pipe (5) between the upper ends of the first casing (2) and the second casing (3), respectively. A one-way valve (7) is provided on the air outlet pipe (6) between the exhaust pipe (10) and the upper ends of the first sleeve (2) and the second sleeve (3); the lower ends of the first sleeve (2) and the second sleeve (3) are respectively connected to the liquid inlet end of the circulation pump (4) and are also respectively connected to the liquid outlet end of the circulation pump (4); an electric valve (8) is provided on the connecting pipelines between the first sleeve (2) and the second sleeve (3) and the liquid inlet end of the circulation pump (4) and the connecting pipelines between the first sleeve (2) and the second sleeve (3) and the liquid outlet end of the circulation pump (4); the electric valve (8) is electrically connected to the controller (1); the circulation pump (4) drives the liquid in the first sleeve (2) and the second sleeve (3) to circulate back and forth, so as to realize the suction and exhaust functions of the whole device; Features: It also includes an impurity filter (11), a first auxiliary pipe (12), a second auxiliary pipe (13), a heat conducting plate (14), a water removal sleeve (15) and a clean air main pipe (16); An impurity filter (11) is provided on the incoming air pipe (9); a plurality of first auxiliary pipes (12) are provided around the first sleeve (2); a plurality of second auxiliary pipes (13) are provided around the second sleeve (3); the upper and lower ends of the first auxiliary pipe (12) are respectively connected to the upper and lower ends of the first sleeve (2); the upper and lower ends of the second auxiliary pipe (13) are respectively connected to the upper and lower ends of the second sleeve (3); a dewatering sleeve (15) is respectively provided in the gap between the first sleeve (2) and the first auxiliary pipe (12) and in the gap between the second sleeve (3) and the second auxiliary pipe (13); the dewatering sleeve (15) at the first sleeve (2) is fixed to the first sleeve (2) and the first auxiliary pipe (12) via a heat conducting plate (14); the dewatering sleeve (15) at the second sleeve (3) is fixed to the first sleeve (2) and the first auxiliary pipe (12) via a heat conducting plate (14); The dewatering sleeve (15) is fixed to the second sleeve (3) and the second auxiliary pipe (13) via a heat conducting plate (14); two exhaust branch pipes (17) extend from one end of the exhaust pipe (10) away from the exhaust pipe (6); the two exhaust branch pipes (17) are respectively connected to the two sets of dewatering sleeves (15); an electric valve (8) electrically connected to the controller (1) is arranged on the exhaust branch pipe (17); a clean air branch pipe (18) is arranged at the outlet end of the dewatering sleeve (15); the clean air branch pipe (18) is connected to the clean air main pipe (16); a one-way valve (7) is arranged on the clean air branch pipe (18); a water storage pipe and an emptying pipe (19) are arranged on the dewatering sleeve (15); and the emptying pipe (19) is provided with an electric valve (8) electrically connected to the controller (1).

2. The multi-chamber casing gas recovery device according to claim 1, characterized in that: The dewatering sleeve (15) at the first sleeve (2) comprises a vertical pipe (20), a main connecting pipe (21) and a secondary connecting pipe (22); a vertical pipe (20) is arranged between each first secondary pipe (12) and the first sleeve (2); heat conducting plates (14) are respectively arranged on both sides of the vertical pipe (20) to connect with the first secondary pipe (12) and the first sleeve (2); two adjacent vertical pipes (20) are connected by a main connecting pipe (21); the main connecting pipes (21) are alternately arranged at the upper and lower ends of the dewatering sleeve (15) to form a cage-shaped coil structure; a secondary connecting pipe (22) is arranged between the two vertical pipes (20) at the middle and lower parts of the dewatering sleeve (15) corresponding to the main connecting pipe (21) arranged at the lower end of the dewatering sleeve (15); the structure of the dewatering sleeve (15) at the second sleeve (3) is the same as the structure of the dewatering sleeve (15) at the first sleeve (2).

3. The multi-chamber casing gas recovery device according to claim 2 is characterized in that: A drain pipe (19) is provided on the main connecting pipe (21) at the lower end of the water removal sleeve (15); one end of the drain pipe (19) is connected to the main connecting pipe (21), and the other end is connected to the first sleeve (2) or the second sleeve (3); at this time, the vertical pipe (20) under the secondary connecting pipe (22) and the corresponding main connecting pipe (21) are water storage pipes.

4. The multi-chamber casing gas recovery device according to claim 3 is characterized in that: A bus bar (23) is arranged inside the vertical pipe (20), the bus bar (23) is fixed on the inner wall of the vertical pipe (20), and dense moisture separation teeth (24) are arranged on the bus bar (23), and the moisture separation teeth (24) are arranged obliquely.

5. The multi-chamber casing gas recovery device according to claim 4, characterized in that: The bus bar (23) is a spiral plate arranged in the vertical pipe (20) or a plurality of rectangular plates arranged in an array along the circumferential direction of the inner wall of the vertical pipe (20).

6. The multi-chamber casing gas recovery device according to claim 5, characterized in that: The main connecting pipe (21) and the auxiliary connecting pipe (22) are both straight pipes or arc-shaped pipes. If they are arc-shaped pipes, their arching direction is arranged horizontally.

7. The multi-chamber casing gas recovery device according to claim 6, characterized in that: The first sleeve (2) and the second sleeve (3) are respectively provided with a liquid level meter (25), and the liquid level meter (25) is electrically connected to the controller (1).

8. The multi-chamber casing gas recovery device according to claim 7, characterized in that: The invention also comprises a first beam seat tube (26), a first beam seat branch tube (27), a second beam seat tube (28) and a second beam seat branch tube (29); the first beam seat tube (26) is arranged at the lower end of the first sleeve (2); the second beam seat tube (28) is arranged at the lower end of the second sleeve (3); the first sleeve (2) and the first beam seat tube (26), the second sleeve (3) and the second beam seat tube (28) respectively form an inverted T-shaped structure; the two ends of the first beam seat tube (26) are respectively connected by the first beam seat branch tube (29); The pipe (27) is connected to the liquid inlet end and the liquid outlet end of the circulation pump (4); the two ends of the second beam seat pipe (28) are respectively connected to the liquid inlet end and the liquid outlet end of the circulation pump (4) through the second beam seat branch pipe (29); the first beam seat branch pipe (27) and the second beam seat branch pipe (29) are respectively provided with electric valves (8); the two ends of the first beam seat pipe (26) and the second beam seat pipe (28) are respectively provided with joint pipes (30); and the joint pipes (30) are provided with valves (31).

9. The multi-chamber casing gas recovery device according to claim 8, characterized in that: It also comprises a base (32) and a vertical frame (33), wherein the vertical frame (33) is arranged on the base (32), and the circulation pump (4), the impurity filter (11), the first beam seat, the second beam seat and the controller (1) are respectively mounted on the base (32) and located inside the vertical frame (33).

10. The recovery method of the multi-chamber casing gas recovery device according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1, filling the first casing (2) and the first auxiliary pipe (12) with liquid, connecting the casing to the incoming air pipe (9), and starting the equipment; S2, the circulation pump (4) starts to work, the controller (1) opens the electric valve (8) on the pipeline connecting the first sleeve (2) and the liquid inlet end of the circulation pump (4), and the electric valve (8) on the pipeline connecting the second sleeve (3) and the liquid outlet end of the circulation pump (4), and at the same time opens the electric valve (8) on the exhaust branch pipe (17) connected to the dewatering sleeve (15) at the first sleeve (2), so that the liquid in the first sleeve (2) and the first auxiliary pipe (12) is transported to the second sleeve (3) and the second auxiliary pipe (13); as the liquid in the first sleeve (2) and the first auxiliary pipe (12) gradually decreases, the sleeve gas is replenished into the first sleeve (2) and the first auxiliary pipe (12) through the air pipe (9), the impurity filter (11), the air inlet pipe (5) and the one-way valve (7), forming air intake; at the same time, the liquid in the second sleeve (3) and the second auxiliary pipe (13) rises, and the gas in the cavity is gradually compressed and discharged, forming air outlet; S3. When the liquid in the first casing (2) and the first auxiliary pipe (12) is transported to the second casing (3) and the second auxiliary pipe (13) and reaches a set value or a set time, the controller (1) closes the electric valve (8) on the pipeline connecting the first casing (2) and the liquid inlet end of the circulation pump (4), the electric valve (8) on the pipeline connecting the second casing (3) and the liquid outlet end of the circulation pump (4), and the electric valve (8) on the exhaust branch pipe (17) connected to the dewatering casing (15) at the first casing (2), and then opens the electric valve (8) on the pipeline connecting the first casing (2) and the liquid outlet end of the circulation pump (4), and the electric valve (8) on the pipeline connecting the second casing (3) and the liquid inlet end of the circulation pump (4). , the electric valve (8) on the exhaust branch pipe (17) connected to the dewatering sleeve (15) at the second sleeve (3) transports the liquid in the second sleeve (3) and the second auxiliary pipe (13) to the first sleeve (2) and the first auxiliary pipe (12); as the liquid gradually decreases in the second sleeve (3) and the second auxiliary pipe (13), the sleeve gas is replenished into the second sleeve (3) and the second auxiliary pipe (13) through the air inlet pipe (9), the impurity filter (11), the air inlet pipe (5) and the one-way valve (7), forming intake air and absorbing heat; at the same time, the liquid in the first sleeve (2) and the first auxiliary pipe (12) rises, and the sleeve gas in the cavity is gradually compressed and discharged, forming exhaust air and releasing heat; S4, the casing gas coming out of the first casing (2) and the first auxiliary pipe (12) passes through the gas outlet pipe (6), the exhaust pipe (10), the exhaust branch pipe (17) and the electric valve (8), and then enters the water removal casing (15) at the second casing (3), and then passes through the clean gas branch pipe (18), the one-way valve (7) and the clean gas main pipe (16) before being discharged; S5. The liquid is continuously transferred back and forth between the first casing (2) and the second casing (3), thereby achieving continuous inflow, outflow and recovery of casing gas.

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