Terrestrial heat exploitation device and circulation flow control method of terrestrial heat exploitation device

Abstract

The invention relates to the technical field of terrestrial heat utilization, and discloses a terrestrial heat exploitation device and a circulating flow control method of the terrestrial heat exploitation device, and the device comprises an exploitation mechanism, a driving mechanism, a heat exchange mechanism and a gas collection mechanism; a liquid circulation channel and a gas channel which are independent from each other are formed in the extraction mechanism, and a heat exchange medium is packaged in the liquid circulation channel; the driving mechanism is connected with the liquid circulation passage and is used for driving the heat exchange medium to circularly flow in the liquid circulation passage; the heat exchange mechanism is connected with the liquid circulation path and used for extracting heat of the heat exchange medium; the gas collecting mechanism is connected with the gas channel and used for collecting gas through the gas channel. According to the terrestrial heat exploitation device and the circulating flow control method of the terrestrial heat exploitation device, terrestrial heat energy of an oil and gas well is fully collected, meanwhile, natural gas remaining in the oil and gas well is developed and utilized again, the energy utilization rate is increased, and better economic benefits are achieved.

Description

Technical Field

[0001] The present application relates to the field of geothermal utilization technology, and in particular to a geothermal mining device and a circulation flow control method for the geothermal mining device. Background Art

[0002] Geothermal energy is a renewable energy source with strong stability, reliability, large reserves, wide distribution, cleanness and environmental protection, and has broad application and development prospects. Abandoned oil and gas wells have a large number of medium and deep geothermal resources, and have great advantages and potential for geothermal development. At the same time, a large number of statistical data show that the primary and secondary development of oil fields can only be between 20% and 35%, and the average recovery rate of oil fields generally does not exceed 50%. Therefore, a large amount of crude oil and natural gas still remain underground in abandoned oil and gas wells.

[0003] In the related art, geothermal extraction devices usually inject circulating fluid from the surface into the geothermal reservoir, and the fluid carries the heat to the surface after passing through the geothermal reservoir. For closed geothermal wells, the fluid only flows in the geothermal well without affecting the geothermal reservoir, thus "extracting heat without extracting water".

[0004] Although the above-mentioned geothermal extraction device can collect geothermal energy from abandoned oil and gas wells, it is unable to develop and utilize other resources remaining in the abandoned oil and gas wells, and the energy utilization rate is low. Summary of the invention

[0005] In view of this, the present application provides a geothermal extraction device and a circulation flow control method for the geothermal extraction device, which can fully collect the geothermal energy of oil and gas wells while re-developing and utilizing the natural gas retained in the oil and gas wells, thereby improving energy utilization and having better economic benefits.

[0006] Specifically, the following technical solutions are included:

[0007] The embodiment of the present application provides a geothermal extraction device, the device comprising: an extraction mechanism, a driving mechanism, a heat exchange mechanism and a gas collection mechanism;

[0008] The extraction mechanism is provided with a liquid circulation passage and a gas passage which are independent of each other, and a heat exchange medium is encapsulated in the liquid circulation passage;

[0009] The driving mechanism is connected to the liquid circulation passage and is used to drive the heat exchange medium to circulate in the liquid circulation passage;

[0010] The heat exchange mechanism is connected to the liquid circulation passage and is used to extract the heat of the heat exchange medium;

[0011] The gas collecting mechanism is connected to the gas passage and is used for collecting gas through the gas passage.

[0012] Optionally, the production mechanism includes: a heat exchange string and a water production string;

[0013] The heat exchange pipe column and the water collection pipe column are coaxially arranged, the water collection pipe column is located inside the heat exchange pipe column, and a first annular space is formed between the heat exchange pipe column and the water collection pipe column;

[0014] The bottom end of the heat exchange pipe column is closed, the bottom end of the water collection pipe column is open, and there is a gap between the bottom end of the water collection pipe column and the bottom end of the heat exchange pipe column;

[0015] The heat exchange medium in the liquid circulation passage sequentially flows through the first annular space, the bottom end of the water sampling pipe string, and the interior of the water sampling pipe string.

[0016] Optionally, the extraction mechanism further includes: a water outlet pipe and a water return pipe;

[0017] One end of the water outlet pipe is connected to the top end of the water collection pipe column, and the other end of the water outlet pipe is connected to the heat exchange mechanism;

[0018] One end of the water return pipe is connected to the first annular space, and the other end of the water outlet pipe is connected to the heat exchange mechanism;

[0019] The heat exchange medium in the liquid circulation passage sequentially flows through the water outlet pipe, the heat exchange mechanism, the water return pipe, the first annular space and the interior of the water collection pipe column.

[0020] Optionally, the production mechanism further comprises: a production casing, the production casing is coaxially arranged with the heat exchange pipe string and sleeved on the outside of the heat exchange pipe string, a second annular space is formed between the heat exchange pipe string and the production casing, and the second annular space is a part of the gas passage;

[0021] The production casing is provided with a gas production hole, and external gas is suitable for entering the second annular space through the gas production hole.

[0022] Optionally, the thermal conductivity of the heat exchange string is greater than a set threshold, and / or the thermal conductivity of the water production string is less than a set threshold.

[0023] Optionally, the geothermal production device further comprises: a wellhead mechanism, the wellhead mechanism being used to install the production mechanism in an oil and gas well;

[0024] The wellhead mechanism comprises a wellhead body and an exhaust valve, wherein the wellhead body is respectively connected with the casing, the water outlet pipe and the water return pipe;

[0025] The exhaust valve is connected to the production casing and is used to block the flow of gas in the gas passage under control.

[0026] Optionally, the production mechanism is suspended below the wellhead body, wherein the heat exchange pipe column is suspended at the bottom of the wellhead body, and the water production casing passes through the inner cavity of the wellhead body and is suspended at the top of the wellhead body.

[0027] Optionally, the gas collecting mechanism is connected to the gas passage and the heat exchanging mechanism respectively, and is used to transport the collected gas to the heat exchanging mechanism.

[0028] Optionally, the heat exchange tubing string further comprises: an anchoring tool, wherein the anchoring tool is disposed on the outer periphery of the heat exchange tubing string and is used to position the heat exchange tubing string on the inner wall of the production casing.

[0029] The present application also provides a circulation flow control method for a geothermal mining device, which is applied to the above-mentioned geothermal mining device, and includes:

[0030] Adjusting the circulation flow of the driving mechanism and / or the outlet liquid temperature of the heat exchange mechanism, and obtaining a plurality of groups of heating parameter groups, each group of the heating parameter groups including the circulation flow, the outlet liquid temperature, and the return liquid temperature and heat intake of the heat exchange mechanism, wherein at least one of the circulation flow and the outlet liquid temperature is different in different heating parameter groups;

[0031] Based on the multiple groups of heating parameter groups, a heating correspondence relationship between the circulation flow rate, the liquid outlet temperature, the liquid return temperature and the heat intake is established;

[0032] Obtaining required heat data, and determining a target circulation flow rate corresponding to the required heat data according to the heat supply correspondence, wherein the required heat parameters include required heat intake and required liquid outlet temperature;

[0033] The driving mechanism is controlled to output according to the target circulation flow rate.

[0034] The beneficial effects of the technical solution provided by the embodiments of the present application include at least:

[0035] The geothermal extraction device and the circulation flow control method of the geothermal extraction device provided in the embodiment of the present application are characterized in that a heat exchange medium is encapsulated in the liquid circulation passage in the device, and the heat exchange medium is driven by the driving mechanism to circulate, and the geothermal energy of the geothermal reservoir is transported to the heat exchange mechanism through the heat exchange medium, so as to realize the collection and utilization of geothermal energy; at the same time, a gas passage is set in the extraction mechanism, and the gas passage is connected to the gas collection mechanism to collect natural gas in the oil and gas wells and develop and utilize the remaining natural gas energy. Compared with the geothermal extraction device of the related art, it can not only efficiently collect geothermal energy in the geothermal reservoir, but also recycle and utilize the natural gas resources retained in the oil and gas wells through the gas passage, with high energy utilization rate, avoiding energy waste and environmental pollution caused by venting. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0037] Figure 1 A first structural schematic diagram of a geothermal extraction device provided in an embodiment of the present application is shown;

[0038] Figure 2 A second structural schematic diagram of a geothermal extraction device provided in an embodiment of the present application is shown;

[0039] Figure 3 A schematic diagram showing the positional relationship of each pipe string in the production mechanism provided in an embodiment of the present application is shown;

[0040] Figure 4 A structural schematic diagram of a wellhead body provided in an embodiment of the present application is shown;

[0041] Figure 5 A schematic flow chart of a circulation flow control method for a geothermal mining device provided in an embodiment of the present application is shown.

[0042] Reference numerals:

[0043] 10. Production mechanism; 101. Perforated formation; 11. Liquid circulation passage; 12. Gas passage; 13. Heat exchange string; 131. Anchoring tool; 132. First annular space; 14. Water production string; 15. Water outlet pipe; 16. Water return pipe; 17. Production casing; 171. Second annular space;

[0044] 20. Heat exchange mechanism;

[0045] 30. Gas collection mechanism;

[0046] 40. Wellhead mechanism; 41. Wellhead body; 42. Exhaust valve.

[0047] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application. In order to make the technical solutions and advantages of the present application clearer, the geothermal mining device and the circulation flow control method of the geothermal mining device will be described in detail in combination with the drawings.

[0049] Geothermal energy is a stable, reliable, large-scale, widely distributed, clean and environmentally friendly renewable energy with broad application prospects. The scientific and rational development of geothermal resources has attracted more and more attention. With the development of science and technology, the use of deep geothermal energy to replace traditional energy for energy supply has become a mature application technology.

[0050] The geothermal extraction device in the related art usually injects circulating fluid from the surface into the geothermal reservoir, and the circulating fluid carries the heat to the surface after passing through the geothermal reservoir. For closed geothermal wells, the fluid only flows in the geothermal well without affecting the geothermal reservoir, thereby "extracting heat without taking water". However, although the above-mentioned geothermal extraction device can collect geothermal energy in oil and gas wells, it cannot develop and utilize other resources (such as natural gas) retained in the oil and gas wells at the same time, and the energy utilization rate is low.

[0051] In this regard, the present application provides a geothermal mining device, such as Figure 1 As shown, the geothermal extraction device provided in the embodiment of the present application may include: an extraction mechanism 10, a driving mechanism, a heat exchange mechanism 20 and a gas collection mechanism 30; the extraction mechanism 10 is formed with a liquid circulation passage 11 and a gas passage 12 which are independent of each other, and the liquid circulation passage 11 is encapsulated with a heat exchange medium; the driving mechanism is connected to the liquid circulation passage 11, and is used to drive the heat exchange medium to circulate in the liquid circulation passage 11; the heat exchange mechanism 20 is connected to the liquid circulation passage 11, and is used to extract the heat of the heat exchange medium; the gas collection mechanism 30 is connected to the gas passage 12, and is used to collect gas through the gas passage 12.

[0052] In the geothermal extraction device provided in the embodiment of the present application, a heat exchange medium is encapsulated in the liquid circulation passage 11, and the heat exchange medium is driven by the driving mechanism to circulate, and the geothermal energy of the geothermal reservoir is transported to the heat exchange mechanism 20 through the heat exchange medium, so as to realize the collection and utilization of geothermal energy; at the same time, a gas passage 12 is set in the extraction mechanism 10, and the gas passage 12 is connected to the gas collection mechanism 30 to collect natural gas in the oil and gas wells and develop and utilize the remaining natural gas energy. Compared with the geothermal extraction device in the related art, it can not only efficiently collect geothermal energy in the geothermal reservoir, but also recycle and utilize the natural gas resources retained in the oil and gas wells through the gas passage 12, with high energy utilization rate, avoiding energy waste and environmental pollution caused by venting.

[0053] It should be noted that a large amount of statistical data shows that the primary and secondary development of oil fields can only be between 20% and 35%, and the average recovery rate of oil fields generally does not exceed 50%. Therefore, a large amount of natural gas still remains underground in abandoned oil and gas wells.

[0054] In some embodiments, the oil and gas wells used by the geothermal extraction device are abandoned or idle oil and gas wells. For example, the geothermal extraction device provided by the present application is hoisted at the wellhead of the abandoned or idle oil and gas well, and the liquid circulation passage 11 in the extraction device is used to extract the geothermal energy in the geothermal reservoir through the downhole heat exchange method, and at the same time, the natural gas resources remaining in the abandoned or idle oil and gas wells are collected and utilized through the gas passage 12. Since the existing idle oil and gas wells or geothermal well bore resources are utilized, there is no need to drill new wells or transform the pump room, so the construction difficulty is greatly reduced and the cost is low.

[0055] Optionally, the production mechanism 10 extends from the wellhead of the oil and gas well into the well and the bottom end of the production mechanism 10 is located below at least one perforated formation 101, the perforated formation 101 is connected to the gas passage 12, and the natural gas retained in the perforated formation 101 enters the gas collection mechanism 30 through the gas passage 12.

[0056] It should be noted that the perforations in the perforated formation 101 are obtained by using special energy-gathering equipment to enter a predetermined layer of the wellbore and perform explosive drilling, which can allow the fluid in the underground formation to enter the perforations and is commonly used in oil and gas wells and coal fields.

[0057] Optionally, the heat exchange medium may be water or other liquids capable of heat exchange, and those skilled in the art may select and adjust the medium according to their needs.

[0058] Optionally, the driving mechanism may be a circulating water pump, and the heat exchange mechanism 20 may be a heat pump.

[0059] In some embodiments, the heat exchange mechanism 20 is connected to a heat-using mechanism to extract the heat energy of the heat exchange medium in the liquid circulation passage 11 and transmit it to the heat-using mechanism.

[0060] like Figure 2 and Figure 3 As shown, in some embodiments of the present application, the production mechanism 10 may include: a heat exchange column 13 and a water production column 14; the heat exchange column 13 and the water production column 14 are coaxially arranged, the water production column 14 is located inside the heat exchange column 13, and a first annular space 132 is formed between the heat exchange column 13 and the water production column 14; the bottom end of the heat exchange column 13 is closed, the bottom end of the water production column 14 is open, and there is a gap between the bottom end of the water production column 14 and the bottom end of the heat exchange column 13; wherein the heat exchange medium in the liquid circulation passage 11 flows through the first annular space 132, the bottom end pipe mouth of the water production column 14, and the interior of the water production column 14 in sequence.

[0061] For example, see Figure 2 The production mechanism 10 may include a heat exchange column 13 and a water production column 14, wherein the water production column 14 is sleeved on the outside of the heat exchange column 13, and a first annular space 132 is formed between the water production column 14 and the heat exchange column 13, wherein the bottom end of the heat exchange column 13 is closed, and the bottom end of the water production column 14 is open, and the heat exchange medium in the heat exchange column 13 exchanges heat with the geothermal reservoir, and then enters the water production column 14 through the bottom end of the water production column 14, and under the drive of the driving mechanism, flows along the extension direction of the water production column 14 and flows into the heat exchange mechanism 20; the heat energy in the heat exchange medium is extracted through the heat exchange mechanism 20, and the heat exchange medium flows into the first annular space 132 of the heat exchange column 13 through the liquid circulation passage 11, flows along the extension direction of the heat exchange column 13, and flows to the heat storage formation again for heat exchange, and completes the heat energy collection of the geothermal reservoir while circulating.

[0062] Optionally, a bottom plug is provided at the bottom end of the heat exchange tube column 13, and the bottom end of the heat exchange tube column 13 is sealed by the bottom plug.

[0063] like Figure 2 As shown, in some embodiments of the present application, the production mechanism 10 may also include: a water outlet pipe 15 and a water return pipe 16; one end of the water outlet pipe 15 is connected to the top pipe mouth of the water production pipe column 14, and the other end of the water outlet pipe 15 is connected to the heat exchange mechanism 20; one end of the return pipe 16 is connected to the first annular space 132, and the other end of the water outlet pipe 15 is connected to the heat exchange mechanism 20, wherein the heat exchange medium in the liquid circulation passage 11 flows through the water outlet pipe 15, the heat exchange mechanism 20, the return pipe 16, the first annular space 132 and the interior of the water production pipe column 14 in sequence.

[0064] For example, see Figure 2The production mechanism 10 can also be provided with a water outlet pipe 15 and a water return pipe 16. The water outlet pipe 15 is respectively connected to the water production pipe column 14 and the heat exchange mechanism 20, and the return pipe 16 is respectively connected to the heat exchange pipe column 13 and the heat exchange mechanism 20. The above-mentioned liquid circulation passage 11 is formed between the heat exchange pipe column 13, the water outlet pipe 15 and the return pipe 16. The driving mechanism is connected to the liquid circulation passage 11 to drive the heat exchange medium encapsulated in the liquid circulation passage 11 to circulate between the heat exchange pipe column 13, the water production pipe column 14, the water outlet pipe 15, the return pipe 16 and the first annular space 132 to realize the exploitation and utilization of the thermal energy in the geothermal reservoir.

[0065] like Figure 2 As shown, in some embodiments of the present application, the production mechanism 10 may also include: a production casing 17, the production casing 17 is coaxially arranged with the heat exchange column 13, and is sleeved on the outside of the heat exchange column 13, and a second annular space 171 is formed between the heat exchange column 13 and the production casing 17, and the second annular space 171 is a part of the gas passage 12; a gas production hole is provided on one side of the production casing 17 near the bottom end, and external gas is suitable for entering the second annular space 171 through the gas production hole.

[0066] In the geothermal extraction mechanism provided in the embodiment of the present application, a production casing 17 may be further provided on the outside of the heat exchanger string 13. The production casing 17 is coaxially arranged with the heat exchanger string 13 and the water production string 14. A second annular space 171 is formed between the production casing 17 and the heat exchanger string 13, and a gas production hole may be provided on the production casing 17. The natural gas retained in the perforated formation 101 enters the second annular space 171 through the gas production hole. The second annular space 171 is connected to the gas collecting mechanism 30. The natural gas enters the gas collecting mechanism 30 through the second annular space 171, so that the natural gas resources retained in the oil and gas wells are collected and utilized.

[0067] Optionally, the gas production hole can be set on one side of the production casing 17 near the bottom, and its position corresponds to the position of the perforated bottom layer 101 to facilitate the flow of gas. In practice, those skilled in the art can select and adjust the size, number and location of the gas production hole according to needs.

[0068] Optionally, the gas collecting mechanism 30 may be a gas storage tank, or may be other gas storage equipment with a gas collecting function, and those skilled in the art may select and adjust it according to their needs.

[0069] Optionally, a one-flow valve 31 may be provided between the gas passage 12 and the gas collecting mechanism 30 so that the gas can only flow in the direction toward the gas collecting mechanism 30 , thereby avoiding the backflow of the gas.

[0070] Optionally, the second annular space 171 may be directly connected to a gas-consuming device, and the natural gas is directly sent to a device capable of consuming the natural gas to generate energy, without passing through the gas collecting mechanism 30, so as to operate the device.

[0071] Optionally, the thermal conductivity of the heat exchange string 13 is greater than a set threshold, and / or the thermal conductivity of the water production string 14 is less than a set threshold.

[0072] It should be noted that the threshold value can be adjusted by technicians in this field according to actual needs. When the thermal conductivity of a material is greater than the threshold value, the material is considered to be a material with high thermal conductivity; when the thermal conductivity of a material is less than the threshold value, the material is considered to be a material with low thermal conductivity. Since the heat exchange medium in the heat exchange column 13 needs to exchange heat with the geothermal reservoir, the material used to make the heat exchange column 13 needs to have high thermal conductivity; while the water production column 14 only needs to realize the circulation of the liquid and can be made of a material with low thermal conductivity.

[0073] In some embodiments, the heat exchange column 13 may be made of a metal material, and the water production column 14 may be made of a non-metal material.

[0074] like Figure 2 and Figure 4 As shown, in some embodiments of the present application, the geothermal extraction device may further include: a wellhead mechanism 40, the wellhead mechanism 40 is used to install the extraction mechanism 10 on the oil and gas well; the wellhead mechanism 40 includes a wellhead body 41 and an exhaust valve 42, the wellhead body 41 is respectively connected to the production casing 17, the water outlet pipe 15 and the return pipe 16; the exhaust valve 42 is connected to the production casing 17, and is used to block the flow of gas in the gas passage 12 under control.

[0075] In the geothermal extraction device provided in the embodiment of the present application, the wellhead mechanism 40 is set on the ground and connected to the wellhead of the oil and gas well, and the extraction mechanism 10 is installed in the oil and gas well; the heat exchange medium enters the water production casing through the heat exchange column 13, enters the water outlet pipe 15 through the wellhead body 41, and after heat exchange in the heat exchange mechanism 20, flows back to the wellhead body 41 from the return pipe 16, and then flows into the heat exchange casing to realize the circulation of the heat exchange medium. In addition, the wellhead body 41 is also connected to the production casing 17, and the production casing 17 is provided with an exhaust valve 42, which can control the on and off of the gas passage 12.

[0076] Optionally, the wellhead mechanism 40 is a three-way structure.

[0077] Optionally, the return pipe 16 is connected to the wellhead body 41 through a flange.

[0078] Optionally, the production mechanism 10 is suspended below the wellhead body 41 , wherein the heat exchange column 13 is suspended at the bottom of the wellhead body 41 , and the water production casing passes through the inner cavity of the wellhead body 41 and is suspended at the top of the wellhead body 41 .

[0079] like Figure 2 As shown, in some embodiments of the present application, the gas collecting mechanism 30 is respectively connected to the gas passage 12 and the heat exchanging mechanism 20 for conveying the collected gas to the heat exchanging mechanism 20 .

[0080] In the geothermal extraction device provided in the embodiment of the present application, the gas collecting mechanism 30 can also be connected to the heat exchange mechanism 20, and the collected gas is transported to the heat exchange mechanism 20 for the operation of the heat exchange mechanism 20, thereby realizing the self-power supply of the heat exchange mechanism 20. The heat exchange mechanism 20 can perform heat exchange work without being connected to other power supply equipment, thereby saving energy and improving energy utilization.

[0081] Optionally, a check valve 31 may be provided between the gas collecting mechanism 30 and the heat exchanging mechanism 20 so that the gas can only flow in the direction toward the heat exchanging mechanism 20 , thereby avoiding the backflow of the gas.

[0082] like Figure 2 As shown, in an embodiment of the present application, the heat exchange string 13 may further include: an anchoring tool 131, which is arranged on the outer periphery of the heat exchange string 13 to realize the positioning of the heat exchange string 13 on the inner wall of the production casing 17.

[0083] The anchoring tool 131 is arranged at the upper or lower part of the heat exchange column 13. When working, the anchor claws of the anchoring tool 131 are opened and stuck on the inner wall of the production casing 17, so as to fix and position the heat exchange column 13 on the inner wall of the production casing 17, reduce the creep of the heat exchange column 13 during working, avoid damage to the heat exchange column 13, and increase its service life.

[0084] In some application scenarios, this embodiment also provides a method for installing a geothermal mining device.

[0085] (1) Clean the wellbore to ensure that there is no fallen objects or debris in the production casing 17.

[0086] (2) The heat exchange string 13 is respectively connected to the bottom plug of the heat exchange string 13 and the anchoring tool 131 through threads and lowered into the production casing 17 to a depth at least exceeding one layer of the perforated formation 101 .

[0087] (3) On the ground, a circulating medium such as softened water is pumped into the heat exchange column 13 by a pump truck and pressurized. When the pressure exceeds the sealing pressure of the anchoring tool 131, the anchor claws of the anchoring tool 131 are opened and fixed on the inner wall of the production casing 17.

[0088] (4) The water production string 14 is lowered into the heat exchange string 13 to a depth at least exceeding one layer of the perforated formation 101 .

[0089] (5) The wellhead mechanism 40, the water outlet pipe 15, the heat exchange mechanism 20, the drive mechanism and the water return pipe 16 are installed in sequence.

[0090] (6) Connect the wellhead exhaust valve 42, the gas collection device and the heat exchange mechanism 20 in sequence.

[0091] like Figure 5 As shown, the embodiment of the present application also provides a circulation flow control method of a geothermal mining device, the method is applied to the above-mentioned geothermal mining device, and the method includes:

[0092] S500, adjusting the circulation flow of the driving mechanism and / or the outlet liquid temperature of the heat exchange mechanism 20, and obtaining multiple groups of heating parameter groups, each heating parameter group including the circulation flow, the outlet liquid temperature, and the return liquid temperature and heat intake of the heat exchange mechanism 20, wherein at least one of the circulation flow and the outlet liquid temperature is different in different heating parameter groups.

[0093] For a specified circulation flow rate and liquid outlet temperature, the return liquid temperature and heat intake of the circulation flow rate and liquid outlet temperature can be measured, and the values ​​of this set of circulation flow rate, liquid outlet temperature, return liquid temperature and heat intake can be recorded as a set of heating parameter groups. Afterwards, the circulation flow rate and / or liquid outlet temperature are adjusted, and the return liquid temperature and heat intake at different circulation flow rates and liquid outlet temperatures after adjustment are measured, so that multiple sets of heating parameter groups can be obtained.

[0094] In some embodiments, the geothermal extraction device may be equipped with a sensor mechanism, which is respectively connected to the driving mechanism and the heat exchange mechanism 20, and the circulation flow and the outlet temperature of the driving mechanism are obtained through the sensor mechanism.

[0095] In some embodiments, the geothermal extraction device may be equipped with a processing chip or a memory, and the acquired heating parameter group may be directly written into the processing chip or the memory for storage, so that in the actual working process, the pre-stored heating parameter group may be directly called.

[0096] S501. Based on multiple groups of heating parameter groups, a heating correspondence between circulation flow, liquid outlet temperature, liquid return temperature and heat intake is established.

[0097] In some embodiments, the elements in the multiple groups of heating parameter groups are divided into a circulation flow set, a liquid outlet temperature set, a liquid return temperature set and a heat extraction set, and the circulation flow parameter sets and liquid outlet temperature parameter sets in the above four sets are traversed to obtain multiple groups of test data, and then data fitting is performed based on the multiple groups of test data to obtain the heating correspondence between the circulation flow, liquid outlet temperature, liquid return temperature and heat extraction.

[0098] For example, in the first step, the circulation flow rate is set to A1, the outlet temperature is set to B1, and the test is carried out to obtain the test data. In the second step, the outlet temperature remains unchanged at B1, the circulation flow rate is adjusted to A2, and the test is carried out again and data is collected. In this way, when the circulation flow rate reaches An, the circulation flow rate is set to A1, and the outlet temperature is successively changed from B1 to Bn, and a total of n 2 The circulation flow of each group is calculated, and data fitting is performed based on the data of these groups to finally obtain the corresponding relationship for heating.

[0099] Optionally, the heat supply correspondence relationship may be pre-written into a processing chip or a memory, so that the heat supply correspondence relationship may be directly called when determining a target circulation flow rate, thereby reducing the amount of calculation of the processing chip.

[0100] Optionally, the number of each parameter set can be adjusted according to actual needs.

[0101] S502, obtaining required heat data, and determining a target circulation flow rate corresponding to the required heat data according to a heat supply correspondence, wherein the required heat data includes required heat intake and required liquid outlet temperature.

[0102] S503, controlling the driving mechanism to output according to the target circulation flow rate.

[0103] After the heat supply correspondence is obtained, the required heat data is obtained and brought into the heat supply correspondence to determine the target circulation flow rate, and finally the current circulation flow rate is adjusted according to the target circulation flow rate.

[0104] Optionally, the required heat data is input by construction personnel according to actual needs on site.

[0105] In summary, the circulation flow control method provided in the embodiment of the present application pre-establishes the corresponding relationship between the circulation flow, liquid outlet temperature, liquid return temperature and heat extraction. When the actual heat extraction work is implemented, the target circulation flow can be obtained by simply inputting the required heat data. By adjusting the circulation flow of the driving mechanism (such as a liquid circulation pump) in the geothermal extraction device to the target circulation flow, the geothermal extraction device can achieve stable heating while meeting the heat demand, thereby improving the control efficiency of the driving mechanism.

[0106] Regarding the devices and systems in the above embodiments, the specific manner in which each device performs operations has been described in detail in the embodiments of the method, and will not be elaborated here.

[0107] It should be noted that the noise control device and the noise control method provided in the above embodiments belong to the same concept, and the specific implementation process is detailed in the method embodiment, which will not be repeated here.

[0108] In the present application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. The term "plurality" refers to two or more than two, unless otherwise clearly defined.

[0109] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the invention disclosed herein. The present application is intended to cover any modification, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and examples are intended to be exemplary only.

[0110] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A geothermal mining device, characterized in that: The device comprises: a production mechanism (10), a driving mechanism, a heat exchange mechanism (20) and a gas collection mechanism (30); The extraction mechanism (10) is formed with a liquid circulation passage (11) and a gas passage (12) which are independent of each other, and a heat exchange medium is encapsulated in the liquid circulation passage (11); The driving mechanism is connected to the liquid circulation passage (11) and is used to drive the heat exchange medium to circulate in the liquid circulation passage (11); The heat exchange mechanism (20) is connected to the liquid circulation passage (11) and is used to extract heat from the heat exchange medium; The gas collecting mechanism (30) is connected to the gas passage (12) and is used for collecting gas through the gas passage (12).

2. The geothermal extraction device according to claim 1, characterized in that: The production mechanism (10) comprises: a heat exchange pipe column (13) and a water production pipe column (14); The heat exchange pipe column (13) and the water collection pipe column (14) are coaxially arranged, the water collection pipe column (14) is located inside the heat exchange pipe column (13), and a first annular space (132) is formed between the heat exchange pipe column (13) and the water collection pipe column (14); The bottom end of the heat exchange pipe column (13) is closed, the bottom end of the water collection pipe column (14) is open, and there is a gap between the bottom end of the water collection pipe column (14) and the bottom end of the heat exchange pipe column (13); The heat exchange medium in the liquid circulation passage (11) flows sequentially through the first annular space (132), the bottom end of the water sampling pipe column (14), and the interior of the water sampling pipe column (14).

3. The geothermal mining device according to claim 2, characterized in that: The extraction mechanism (10) further comprises: a water outlet pipe (15) and a water return pipe (16); One end of the water outlet pipe (15) is connected to the top end of the water sampling pipe column (14), and the other end of the water outlet pipe (15) is connected to the heat exchange mechanism (20); One end of the water return pipe (16) is connected to the first annular space (132), and the other end of the water outlet pipe (15) is connected to the heat exchange mechanism (20); The heat exchange medium in the liquid circulation passage (11) flows sequentially through the water outlet pipe (15), the heat exchange mechanism (20), the water return pipe (16), the first annular space (132) and the interior of the water sampling pipe column (14).

4. The geothermal mining device according to claim 2, characterized in that: The production mechanism (10) further comprises: a production casing (17), the production casing (17) being coaxially arranged with the heat exchange pipe column (13) and sleeved on the outside of the heat exchange pipe column (13), a second annular space (171) being formed between the heat exchange pipe column (13) and the production casing (17), the second annular space (171) being a part of the gas passage (12); The production casing (17) is provided with a gas production hole, and external gas is suitable for entering the second annular space (171) through the gas production hole.

5. The geothermal extraction device according to any one of claims 2 to 4, characterized in that: The thermal conductivity of the heat exchange pipe column (13) is greater than a set threshold, and / or the thermal conductivity of the water production pipe column (14) is less than a set threshold.

6. The geothermal mining device according to claim 4, characterized in that: The geothermal production device further comprises: a wellhead mechanism (40), wherein the wellhead mechanism (40) is used to install the production mechanism (10) on an oil and gas well; The wellhead mechanism (40) comprises a wellhead body (41) and an exhaust valve (42), wherein the wellhead body (41) is respectively connected to the casing, the water outlet pipe (15) and the water return pipe (16); The exhaust valve (42) is connected to the production casing (17) and is used to block the flow of gas in the gas passage (12) under control.

7. The geothermal mining device according to claim 6, characterized in that: The production mechanism (10) is suspended below the wellhead body (41), wherein the heat exchange pipe column (13) is suspended at the bottom of the wellhead body (41), and the water production casing passes through the inner cavity of the wellhead body (41) and is suspended at the top of the wellhead body (41).

8. The geothermal extraction device according to claim 1, characterized in that: The gas collecting mechanism (30) is respectively connected to the gas passage (12) and the heat exchange mechanism (20), and is used to transport the collected gas to the heat exchange mechanism (20).

9. The geothermal mining device according to claim 4, characterized in that: The heat exchange column (13) further comprises: an anchoring tool (131), wherein the anchoring tool (131) is arranged on the outer periphery of the heat exchange column (13) and is used to realize the positioning of the heat exchange column (13) on the inner wall of the production casing (17).

10. A circulation flow control method for a geothermal mining device, characterized in that: The method is applied to the geothermal extraction device according to any one of claims 1 to 9, and the method comprises: Adjusting the circulation flow rate of the driving mechanism and / or the outlet liquid temperature of the heat exchange mechanism (20), and obtaining a plurality of groups of heating parameter groups, each group of the heating parameter groups comprising the circulation flow rate, the outlet liquid temperature, and the return liquid temperature and heat intake of the heat exchange mechanism (20), wherein at least one of the circulation flow rate and the outlet liquid temperature is different in different heating parameter groups; Based on the multiple groups of heating parameter groups, a heating correspondence relationship between the circulation flow rate, the liquid outlet temperature, the liquid return temperature and the heat intake is established; Obtaining required heat data, and determining a target circulation flow rate corresponding to the required heat data according to the heat supply correspondence, wherein the required heat parameters include required heat intake and required liquid outlet temperature; The driving mechanism is controlled to output according to the target circulation flow rate.

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