Transformation method for novel gravity long-term energy storage system and exhausted gas well

Abstract

The invention discloses a novel gravity long-term energy storage system and an exhausted gas well transformation method, and relates to the technical field of gravity energy storage. The transmission structure comprises a sun gear, a planet gear and a gear ring, the sun gear and the gear ring are coaxially arranged from inside to outside, and an annular space is reserved between the sun gear and the gear ring; the plurality of planet gears are uniformly distributed along the annular space; gaps are reserved among the sun gear, the planet gear and the gear ring; permanent magnets for realizing magnetic attraction are arranged on the outer side of the sun gear, the outer side of the planet gear and the inner side of the gear ring; and the gear ring is connected with external equipment. The problems that in the prior art, construction of a heavy object working section is high in cost and large in occupied area are solved. Energy is transmitted through coupling of a magnetic field in a planetary magnetic gear transmission mode, the problem of rigid connection does not exist, the mechanical gear transmission mode is effectively changed, friction of traditional mechanical transmission is avoided, and transmission of vibration from the driving wheel to the driven wheel is also avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of new gravity energy storage, and specifically relates to a new gravity long-term energy storage system and a method for transforming depleted gas wells. Background Art

[0002] The new gravity energy storage technology is a new technology that has developed rapidly in recent years. Currently, there are mainly four types, namely: gravity piston-driven pumped storage technology, mountain railway gravity energy storage technology, tower crane gravity energy storage technology, and mine shaft gravity energy storage technology. According to a report by Dongya Qianhai Securities, the new gravity energy storage industry is in the initial stage of development, and the competition pattern has not yet taken shape. Currently, there are mainly four new gravity energy storage industrialization companies in the world, namely EV in Switzerland, Gravity Power and ARES in the United States, etc. Most of their projects are in the conceptual or proposal stage.

[0003] From the perspective of the changing trends of the global and Chinese energy systems, energy storage technology has become the focus of development in the power transmission and distribution field. First, due to the continuous clean transformation of the global energy structure, new energy power generation methods such as solar and wind are greatly affected by natural factors and have obvious characteristics of intermittent power generation. As the grid-connected capacity of new energy increases, the impact on the power grid from the power generation side expands. Second, with the continuous growth of energy conservation and environmental protection requirements, the terminal energy consumption demand of the whole society continues to shift to electric energy. The proportion of fossil energy in terminal consumption decreases, and the power consumption demand of new electric power terminals such as new energy vehicles continues to increase. The load demand of the power grid will continue to change in the future. The fluctuating changes at both the supply and demand ends of the power grid have led to a rapid increase in the demand for energy storage projects in the entire power system.

[0004] The new gravity energy storage technology stores energy in the form of potential energy, that is, mainly stores energy in the elevation gain of heavy objects composed of solid or liquid media. In the charging mode, the system drives the motor to lift the heavy object to a suitable height; in the discharging mode, the system drives the generator to generate electricity by releasing the heavy object. Different from the traditional pumped storage technology, the new gravity energy storage technology can avoid the limitation of geological conditions, and at the same time has advantages such as zero self-discharge rate, large energy storage capacity ratio, high discharge depth, and high cycle conversion efficiency (>90%). It can be applied to the power system for peak shaving, and can also be used for the long-term utilization and storage of new energy. Due to its long discharge time (usually >10 hours) and adjustable, and flexible distribution setting location, it can effectively ensure the continuous supply of electricity and significantly enhance the resilience of the power grid. Currently, it has gradually become a hot spot for development and application in industries such as the power industry, mining industry, and construction industry, with great application and development potential. However, in the existing technology, the new gravity energy storage technology has not been applied to gas wells, and there is no record of relevant technologies for defect detection and transformation in gas wells to be applicable to new gravity energy storage. Moreover, there are also problems of high cost and large land occupation in the construction of the heavy object working section.

[0005] Secondly, since power generation and electricity storage are carried out using depleted gas wells, the process of lowering and lifting heavy objects is very frequent, and the travel distance of the heavy objects and the lifting ropes during full-power charge and discharge is extremely long (greater than 1000 meters) each time. If the traditional method of using gears and steel ropes is adopted, there will be a lot of friction between the gears and between the gears and the steel wire ropes, which will generate a large amount of heat release and power consumption loss, reduce the efficiency of the entire system and may affect safety. Summary of the Invention

[0006] The present invention aims to solve the deficiencies of the prior art and provides a new type of gravity long-term energy storage system and a method for transforming depleted gas wells. The transformation method solves the problems of high cost and large land occupation in the construction of the heavy object working section in the prior art through the standard requirements for gas well transformation, and has higher durability, reliability, operation convenience and safety. In addition, the transmission structure proposed by the present invention transmits energy through the coupling of magnetic fields in the way of planetary magnetic gear transmission, there is no problem of rigid connection, effectively changes the mechanical gear transmission method, avoids the friction of traditional mechanical transmission, and also avoids the transmission of vibration from the driving wheel to the driven wheel.

[0007] The present invention is realized through the following technical solutions:

[0008] A new type of gravity long-term energy storage system, including a transmission structure arranged at the gas wellhead;

[0009] The transmission structure includes a sun gear, planet gears and a gear ring. The sun gear and the gear ring are coaxially arranged from the inside to the outside, and there is a circumferential space between the sun gear and the gear ring; there are several planet gears, and several planet gears are evenly distributed along the circumferential space; there are gaps between the sun gear, the planet gears and the gear ring;

[0010] The axis of the sun gear is provided with a support shaft, and the support shaft is fixed to the ground bracket; the sun gear is rotationally connected to the support shaft and can rotate around the axis of the support shaft; one side of the sun gear extends outwards and is connected with a winch that rotates synchronously. A lifting rope is wound on the winch, and a heavy object is suspended on the lifting rope; several planet gears are rotationally connected to the support shaft through claw tools, and the claw tools can rotate around the axis of the support shaft;

[0011] Permanent magnets for realizing magnetic attraction are arranged on the outer side of the sun gear, the outer side of the planet gears and the inner side of the gear ring; the gear ring is connected to external equipment.

[0012] In the prior art, since power generation and electricity storage are carried out using depleted gas wells, the process of lowering and lifting heavy objects is very frequent, and the travel distance of the full-power charge and discharge of heavy objects and lifting ropes is extremely long (greater than 1000 meters) each time. If the traditional method of using gears and steel ropes is adopted, there is a lot of friction between gears and between gears and steel ropes, which will generate a large amount of heat and power consumption loss, reduce the efficiency of the entire system and may affect safety. The present invention provides a novel gravity long-term energy storage system, which includes a transmission structure arranged at the gas wellhead. The transmission structure transmits energy through the coupling of the magnetic field by means of planetary magnetic gear transmission, and there is no problem of rigid connection, effectively changing the mechanical gear transmission method, avoiding the friction of traditional mechanical transmission, and also avoiding the transmission of vibration from the driving wheel to the driven wheel. In a specific solution, it includes a sun gear, planet gears and a gear ring. The sun gear is located at the axis position and serves as a transmission component. In the middle of one side of the sun gear, it extends outward and is coaxially connected with a winch. A lifting rope is wound around the winch. Therefore, during the free fall of the heavy object, it will drive the winch to rotate, and the winch drives the sun gear to rotate synchronously, thereby driving the sun gear to rotate; a gear ring is coaxially arranged outside the sun gear, and planet gears are arranged between the sun gear and the gear ring as magnetic force transmission components. During the rotation of the sun gear, since both the outer circumferences of the sun gear and the planet gears are provided with permanent magnets, and the magnetic properties of the permanent magnets are relatively large, even if there is a gap between the sun gear and the planet gears, it can drive several planet gears to rotate synchronously through magnetic force, and several planet gears drive the gear ring to rotate synchronously through magnetic force. The gear ring is connected to external power generation equipment, power consumption equipment, etc., so as to store energy through gravity and transmit mechanical energy to the sun gear, planet gears and gear ring in sequence; in the above solution, since a planetary magnetic gear transmission mechanism and a pulling rope are designed and installed at the wellhead, energy is transmitted through the coupling of the magnetic field by means of planetary magnetic gear transmission, thereby realizing discharge - charge. This structure has no problem of rigid connection, effectively changes the mechanical gear transmission method, avoids the friction of traditional mechanical transmission, and also avoids the transmission of vibration from the driving wheel to the driven wheel. The planetary magnetic gear here is not only used as an ordinary single-input - single-output gearbox, but can also be used as a gearbox with different speed ratios due to different magnitudes of the input tension, thereby improving the reliability of the entire system. To recover the suspended heavy object in the above solution, just drive the sun gear to reverse.

[0013] In a further solution, as a specific implementation manner of a claw tool, the claw tool includes a connecting rod and a central sleeve. Each of the planet gears is connected to the central sleeve through a connecting rod, and the central sleeve is rotatably connected to the support shaft. The above-mentioned rotatable connection method can be realized through a bearing connection.

[0014] For a further solution, to preliminarily adjust the magnetic attraction between the magnetic gears, the planetary gear is rotatably connected to the end of the connecting rod, and the planetary gear can rotate around its own axis; the permanent magnets are arranged alternately with N poles and S poles in sequence along their own length directions. In this solution, since the planetary gear can rotate around its own axis and there are several N poles and S poles arranged on the outer ring, during the preliminary installation, by manually rotating the external gear ring, the gear ring can be rotated to a position where it attracts the internal planetary gear, and the planetary gear can also rotate slightly to adjust its own position. Subsequently, several planetary gears are driven to rotate to a position where they attract the internal sun gear.

[0015] For a further solution, it further includes several position sensors arranged on the inner wall of the gas well, and several of the position sensors are arranged in sequence along the depth direction of the gas well. The position sensors are used to detect the falling length and position of the heavy object.

[0016] For a further solution, it further includes several harmful gas alarms arranged on the inner wall of the gas well, and several of the harmful gas alarms are arranged in sequence along the depth direction of the gas well.

[0017] For a further solution, it further includes several magnetic suction ports arranged on the inner wall of the gas well and an energizing device for energizing several of the magnetic suction ports, and several of the magnetic suction ports are arranged in sequence along the depth direction of the gas well; the heavy object is magnetic, and the magnetic suction ports are used to adsorb the heavy object. In this solution, the magnetic suction ports are arranged on one side of the falling path of the heavy object. Additionally, a limiting device can be arranged at the magnetic suction ports. When it is necessary to stop the heavy object from falling, the limiting device is extended to restrict the falling of the heavy object, and the heavy object is fixed by magnetic attraction at the magnetic suction ports.

[0018] For a further solution, the inner wall of the gas well is sprayed with lubricating oil. By spraying oil on the inner wall of the gas well for protection, ordinary lubricating oil can be used for the oil component, and the spraying thickness ≥ 0.5 mm.

[0019] For a further solution, a method for reforming a depleted gas well includes the following steps:

[0020] S1: Inspect the internal condition of the gas well and calculate the movable working section of the heavy object. The movable working section is divided into a daily working section, a standby working section, and an emergency working section from top to bottom in sequence;

[0021] S2: Detect whether there is residual water or gas in the gas well; and detect the integrity of the inner wall of the gas well through a hoisting endoscope and a camera device;

[0022] S3: If the gas well reaches the available level, install position sensors and magnetic suction ports at the head and tail ends of the daily working section, standby working section, and emergency working section of the gas well; install combustible gas alarm devices at the head end of the daily working section and the tail end of the emergency working section; install harmful gas alarms at the head end of the daily working section and within the standby working section and emergency working section;

[0023] S4: Finally, perform oil spraying protection on the inner wall of the gas well. After the protection is completed, install the transmission structure at the gas wellhead, thus completing the transformation of the depleted gas well;

[0024] A further solution is that the step S2 further includes the following steps:

[0025] When it is detected that there is residual water or gas in the gas well, at the lower part of the emergency working section and at a position where the original perforations at the bottom of the gas well are ≥50 cm, use a self-expanding plug for sealing, and drain the water or gas by suction;

[0026] When it is detected that there are residues on the inner wall of the gas well, the pipe wall needs to be cleaned until the height of the residues does not exceed 0.1 mm of the pipe wall;

[0027] After completing the above steps, finally introduce dry nitrogen and conduct several thorough purges of the gas well.

[0028] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0029] 1. The present invention provides a method for transforming a depleted gas well for a new type of gravity long-term energy storage system. The transformation method solves the problems of high cost and large land occupation in the construction of heavy object working sections in the prior art through the standard requirements for gas well transformation, and has higher durability, reliability, operation convenience, and safety.

[0030] 2. The present invention provides a method for transforming a depleted gas well for a new type of gravity long-term energy storage system. The transformation method, different from using common mine shafts, uses a depleted gas well to establish a heavy object moving working section and seals it with a self-expanding plug at the bottom; the gas well is divided into a daily working section, a standby working section, and an emergency working section. To accurately know the internal situation of the gas well, requirements for relevant data collection and transmission methods are proposed, and at the same time, requirements for the treatment methods of the inner wall are put forward; this technical idea can be applied to similar products or other products that use the lifting distance for gravity energy storage to help effectively control the movement of heavy objects and improve the positioning accuracy, speed, and safety.

[0031] 3. The present invention provides a novel gravity long-term energy storage system and a method for transforming depleted gas wells. The transmission structure transmits energy through magnetic coupling of a planetary magnetic gear, without the problem of rigid connection, effectively changing the mechanical gear transmission method, avoiding the friction of traditional mechanical transmission, and also avoiding the transmission of vibration from the driving wheel to the driven wheel. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts. In the drawings:

[0033] Figure 1 is a schematic structural diagram of a transmission structure according to an embodiment provided by the present invention;

[0034] Figure 2 is a schematic diagram of the transformation of an entire gas well according to an embodiment provided by the present invention.

[0035] Reference numerals in the drawings and corresponding component names:

[0036] 1 - sun gear, 2 - planet gear, 3 - gear ring, 4 - permanent magnet, 5 - claw tool. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0037] To make the objectives, technical solutions, and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the embodiments and the drawings. The illustrative embodiments of the present invention and their descriptions are only used to explain the present invention and are not intended to limit the present invention.

[0038] Embodiment 1:

[0039] This Embodiment 1 provides a novel gravity long-term energy storage system, as Figure 1 shown, including a transmission structure disposed at the gas wellhead;

[0040] The transmission structure includes a sun gear 1, planet gears 2, and a gear ring 3. The sun gear 1 and the gear ring 3 are coaxially arranged from the inside to the outside, and there is an annular space between the sun gear 1 and the gear ring 3; there are several planet gears 2, and the several planet gears 2 are evenly distributed along the annular space; there are gaps between the sun gear 1, the planet gears 2, and the gear ring 3;

[0041] The sun gear 1 has a support shaft at its axis, and the support shaft is fixed to the ground bracket; the sun gear 1 is rotationally connected to the support shaft and can rotate around the axis of the support shaft; one side of the sun gear 1 extends outward and is connected to a winch that rotates synchronously, and the winch is used for winding a lifting rope, and a heavy object is suspended on the lifting rope; a plurality of the planet gears 2 are rotationally connected to the support shaft through a claw 5, and the claw 5 can rotate around the axis of the support shaft.

[0042] Permanent magnets 4 for realizing magnetic attraction are arranged on the outer side of the sun gear 1, the outer side of the planet gear 2 and the inner side of the gear ring 3; the gear ring 3 is connected to an external device.

[0043] In the prior art, since power generation and electricity storage are carried out using depleted gas wells, the process of lowering and lifting heavy objects is very frequent, and the travel distance of the full-power charge and discharge of heavy objects and lifting ropes is extremely long (greater than 1000 meters) each time. If the traditional method of using gears and steel ropes is adopted, there is a lot of friction between gears and between gears and steel ropes, which will generate a large amount of heat release and power consumption loss, reduce the efficiency of the entire system and may affect safety. The present invention provides a novel gravity long-term energy storage system, which includes a transmission structure arranged at the gas wellhead. The transmission structure transmits energy through the coupling of the magnetic field by means of planetary magnetic gear transmission, without the problem of rigid connection, effectively changing the mechanical gear transmission method, avoiding the friction of traditional mechanical transmission, and also avoiding the transmission of vibration from the driving wheel to the driven wheel. In a specific embodiment, it includes a sun gear 1, planet gears 2 and a gear ring 3. The sun gear 1 is located at the axis position and serves as a transmission component. A winch extends outward from the middle of one side of the sun gear 1 and is coaxially connected. A lifting rope is wound around the winch. Therefore, during the free fall of the heavy object, the winch will be driven to rotate, and the winch drives the sun gear 1 to rotate synchronously, thereby driving the sun gear 1 to rotate; a gear ring 3 is coaxially arranged outside the sun gear 1, and planet gears 2 are arranged between the sun gear 1 and the gear ring 3 as magnetic force transmission components. During the rotation of the sun gear 1, since both the outer circumferential of the sun gear 1 and the outer circumferential of the planet gears 2 are provided with permanent magnets 4, and the magnetic properties of the permanent magnets 4 are relatively large, even if there is a gap between the sun gear 1 and the planet gears 2, several planet gears 2 can be driven to rotate synchronously through magnetic force, and several planet gears 2 then drive the gear ring 3 to rotate synchronously through magnetic force. The gear ring 3 is connected to external power generation equipment, electrical equipment, etc., so that through gravity energy storage, mechanical energy is sequentially transmitted to the sun gear 1, planet gears 2 and gear ring 3; in the above solution, since a planetary magnetic gear transmission mechanism and a pulling rope are designed and installed at the wellhead, energy is transmitted through the coupling of the magnetic field by means of planetary magnetic gear transmission, thereby realizing discharge-charge. This structure has no problem of rigid connection, effectively changes the mechanical gear transmission method, avoids the friction of traditional mechanical transmission, and also avoids the transmission of vibration from the driving wheel to the driven wheel. The planetary magnetic gear here is not only used as an ordinary single-input single-output gearbox, but can also be used as a gearbox with different speed ratios due to different magnitudes of the input pulling force, thereby improving the reliability of the entire system. To recover the suspended heavy object in the above solution, just drive the sun gear 1 to reverse.

[0044] In this embodiment, as a specific implementation manner of a claw 5, the claw 5 includes a connecting rod and a central sleeve. Each planet gear 2 is connected to the central sleeve through a connecting rod, and the central sleeve is rotatably connected to the support shaft. The above-mentioned rotational connection method can be realized through a bearing connection.

[0045] In this embodiment, to preliminarily adjust the magnetic attraction between the magnetic gears, the planetary gear 2 is rotatably connected to the end of the connecting rod, and the planetary gear 2 can rotate around its own axis; the permanent magnets 4 are arranged alternately with N poles and S poles in sequence along their own length directions. In this solution, since the planetary gear 2 can rotate around its own axis by itself and there are several N poles and S poles arranged on the outer ring, during the preliminary installation, by manually rotating the external gear ring 3, the gear ring 3 can be rotated to a position where it attracts the internal planetary gear 2, and the planetary gear 2 can also rotate slightly to adjust its own position, and then drive several planetary gears 2 to rotate to a position where they attract the internal sun gear 1.

[0046] In this embodiment, it further includes several position sensors arranged on the inner wall of the gas well, and several said position sensors are arranged in sequence along the depth direction of the gas well. The position and the dropped length of the heavy object are detected by the position sensors.

[0047] In this embodiment, it further includes several harmful gas alarms arranged on the inner wall of the gas well, and several said harmful gas alarms are arranged in sequence along the depth direction of the gas well.

[0048] In this embodiment, it further includes several magnetic suction ports arranged on the inner wall of the gas well and an energizing device for energizing several said magnetic suction ports, and several said magnetic suction ports are arranged in sequence along the depth direction of the gas well; the heavy object is magnetic, and the magnetic suction ports are used to adsorb the heavy object. The magnetic suction ports in this solution are arranged on one side of the dropping path of the heavy object. In addition, a limiting device can also be arranged at the magnetic suction ports. When it is necessary to stop the heavy object from dropping, the dropping of the heavy object is restricted by extending the limiting device, and it is fixed by suction through the magnetic suction ports.

[0049] In this embodiment, the inner wall of the gas well is sprayed with lubricating oil. By spraying the inner wall of the gas well for protection, ordinary lubricating oil can be used for the oil component, and the spraying thickness ≥ 0.5 mm.

[0050] Embodiment 2:

[0051] This Embodiment 2 is further limited on the basis of Embodiment 1, and also provides a method for reforming a depleted gas well, as Figure 2 shown, including the following steps:

[0052] S1: Examine the internal condition of the gas well, and measure the movable working section of the heavy object, and divide the movable working section into a daily working section, a standby working section and an emergency working section from top to bottom in sequence;

[0053] S2: Detect whether there is residual water or gas in the gas well; and detect the integrity of the inner wall of the gas well through a hoisting endoscope and a camera device;

[0054] S3: If the gas well reaches the available level, position sensors and magnetic suction ports shall be installed at the head and tail ends of the daily working section, standby working section, and emergency working section of the gas well; combustible gas alarm devices shall be installed at the head end of the daily working section and the tail end of the emergency working section; harmful gas detectors shall be installed at the head end of the daily working section and within the standby working section and the emergency working section;

[0055] S4: Finally, the inner wall of the gas well shall be protected by spraying oil. After the protection is completed, the transmission structure shall be installed at the gas wellhead, thereby completing the transformation of the depleted gas well;

[0056] In this embodiment, the step S2 further includes the following steps:

[0057] When it is detected that there is residual water or gas in the gas well, at a position where the original perforations at the bottom of the gas well are ≥ 50 cm below the emergency working section, a self-expanding plug shall be used for sealing, and the water or gas shall be discharged by suction;

[0058] When it is detected that there are residues on the inner wall of the gas well, the pipe wall shall be cleaned until the height of the residues does not exceed 0.1 mm of the pipe wall;

[0059] After completing the above steps, finally, dry nitrogen shall be introduced to thoroughly purge the gas well several times.

[0060] Compared with the prior art, the new gravity energy storage technology has not been applied to gas wells, and there is no record of relevant technologies for defect detection and transformation of gas wells to be applicable to the new gravity energy storage. Moreover, there are problems such as high cost and large land occupation in the construction of the heavy object working section. This solution also provides a method for transforming depleted gas wells. By meeting the standard requirements for gas well transformation, it solves the problems of high cost and large land occupation in the construction of the heavy object working section in the prior art, and has higher durability, reliability, operation convenience, and safety. Therefore, the present invention further includes the following specific concepts and steps:

[0061] The invention mainly analyzes the characteristics of existing depleted gas wells, proposes possible problems when they are used as heavy object moving working sections, and proposes comparison criteria and solutions. In view of the construction requirements of the new gravity energy storage system, it analyzes the safety, stability, and adaptability of the system, clarifies its operating characteristics and wellbore transformation standard requirements, and examines its use effect through experiments:

[0062] The first aspect is to select depleted gas wells with a drilling well depth (vertical depth) greater than 1000 m as target gas wells.

[0063] The second aspect is to analyze the characteristics of existing depleted gas wells, preliminarily examine their internal conditions, and then segment the inner wall of the gas well into sections of 5 m (or other dimensions) on the computer, measure the movable working section K-J of the heavy object, and take 70% from the surface opening K to the bottom of the well as the daily working section, setting a mark G; 20% from G to the bottom of the well as the standby working section, setting a mark B; 10% from B to the bottom of the well as the emergency working section, setting a mark J.

[0064] The third aspect is to confirm the gas well. By means of measurement and endoscopic inspection, etc., clarify the cavity size, gas well depth, inner wall integrity, whether there is corrosion on the pipe wall, whether there is water or remaining gas in the whole gas well, etc.; by monitoring / detecting harmful gases, clarify whether there is a risk of gas leakage. In terms of dimensions: its available length should be greater than 1500 m, and the available diameter should be greater than DN60 mm; in terms of gas well conditions: the inner wall of the pipeline should be smooth, with little or no corrosion, and after detection, there should be no harmful gases or accumulated water, etc. To accurately know the internal situation of the gas well, the endoscope uses the method of hoisting and online video recording, moves at a speed of ≤1 m / s, and simultaneously collects images through drone image transmission technology, XingFlash technology or optical fiber transmission, and transmits them to the wellhead computer in real time for real-time analysis. After collecting all the data, a report is issued.

[0065] The fourth aspect is to process the gas well. If the gas well is available, that is, for the lower part of the emergency working section (≥50 cm above the original perforation), use a self-expanding plug to seal it, and remove the remaining harmful gases and accumulated water by suction, etc. If there is dirt, corrosion products, etc. on the inner wall, the pipe wall needs to be cleaned so that the residue does not exceed 0.1 mm in height on the pipe wall; finally, introduce dry nitrogen and conduct 3 thorough purges of the gas well.

[0066] The fifth aspect is to set position sensors at the key positions of the gas well, namely K, G, B, and J, set combustible gas alarm devices at points J and K respectively, set harmful gas alarms at points K and the midpoint of K-G respectively, and set limit devices and magnetic suction ports W(N) at K, G, B, and J. These alarm points and position sensing points are all connected to the wellhead indicator board through wires and can be lit separately according to different identifications. For example, when the W(S) point at the bottom of the sliding heavy object Z in the gas well reaches positions K, G, B, and J respectively, it can be suctioned to the magnetic suction port W(N) as needed to stop the heavy object Z. At the same time, points K, G, B, and J on the wellhead indicator board are always on, and they go out after the heavy object Z leaves 10 cm.

[0067] The sixth aspect is to spray oil on the inner wall of the gas well for protection. Ordinary lubricating oil can be used for the oil content, and the spraying thickness should be ≥0.5 mm.

[0068] The entire above gas well system device can apply the detection, analysis and experimental methods proposed by the present invention, as well as the standard requirements for gas well transformation. Together with the harmful gas leakage alarm and the overall system safety warning device, a safe and reliable heavy object moving section can be built after implementation, solving the problems of high cost and large land occupation existing in the construction of heavy object working sections in the prior art, and having higher durability, reliability, operation convenience and safety.

[0069] The specific embodiments described above further elaborate on the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above are only specific embodiments of the present invention and are not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A novel gravity long-term energy storage system, characterized in that, it includes a transmission structure arranged at the gas wellhead; The transmission structure includes a sun gear (1), planet gears (2) and a gear ring (3). The sun gear (1) and the gear ring (3) are coaxially arranged from inside to outside, and there is an annular space between the sun gear (1) and the gear ring (3); There are several planet gears (2), and several planet gears (2) are evenly distributed along the annular space; There are gaps between the sun gear (1), the planet gears (2) and the gear ring (3); The axis of the sun gear (1) is provided with a support shaft, and the support shaft is fixed to the ground bracket; The sun gear (1) is rotatably connected to the support shaft and can rotate around the axis of the support shaft; One side of the sun gear (1) extends outward and is connected to a synchronously rotating winch, and a lifting rope is wound on the winch, and a heavy object is suspended on the lifting rope; Several planet gears (2) are rotatably connected to the support shaft through a claw tool (5), and the claw tool (5) can rotate around the axis of the support shaft; Permanent magnets (4) for realizing magnetic attraction are arranged on the outer side of the sun gear (1), the outer side of the planet gears (2) and the inner side of the gear ring (3); The gear ring (3) is connected to external equipment.

2. A novel gravity long-term energy storage system according to claim 1, characterized in that, The claw tool (5) includes a connecting rod and a central sleeve. Each planet gear (2) is connected to the central sleeve through a connecting rod, and the central sleeve is rotatably connected to the support shaft.

3. A novel gravity long-term energy storage system according to claim 2, characterized in that, The planet gear (2) is rotatably connected to the end of the connecting rod, and the planet gear (2) can rotate around its own axis.

4. A novel gravity long-term energy storage system according to claim 3, characterized in that, The permanent magnets (4) are alternately arranged with N poles and S poles in sequence along their own length directions.

5. A novel gravity long-term energy storage system according to claim 1, characterized in that, It further includes several position sensors arranged on the inner wall of the gas well, and several position sensors are arranged in sequence along the depth direction of the gas well.

6. A novel gravity long-term energy storage system according to claim 1, characterized in that, It further includes several harmful gas alarms arranged on the inner wall of the gas well, and several harmful gas alarms are arranged in sequence along the depth direction of the gas well.

7. A novel gravity long-term energy storage system according to claim 1, characterized in that, It further includes several magnetic suction ports arranged on the inner wall of the gas well and an energizing device for energizing several magnetic suction ports. Several magnetic suction ports are arranged in sequence along the depth direction of the gas well; The heavy object has magnetism, and the magnetic suction port is used to adsorb the heavy object.

8. A novel gravity long-term energy storage system according to claim 1, characterized in that, The inner wall of the gas well is sprayed with lubricating oil.

9. A method for reforming a depleted gas well, characterized in that, it includes the following steps: S1: Examine the internal condition of the gas well, and measure the movable working section of the heavy object. Divide the movable working section into a daily working section, a standby working section, and an emergency working section from top to bottom in sequence; S2: Detect whether there is residual water or gas in the gas well; and detect the integrity of the inner wall of the gas well through a hoisting endoscope and a camera device; S3: If the gas well reaches the available level, install position sensors and magnetic suction ports at the head and tail ends of the daily working section, standby working section, and emergency working section of the gas well; install a combustible gas alarm device at the head end of the daily working section and the tail end of the emergency working section; install harmful gas detectors in the head end of the daily working section and in the standby working section and the emergency working section; S4: Finally, spray oil on the inner wall of the gas well for protection. After the protection is completed, install the transmission structure at the gas wellhead, thereby completing the transformation of the depleted gas well; The transmission structure is the transmission structure described in any one of claims 1 to 8.

10. A method for transforming a depleted gas well according to claim 9, characterized in that the step S2 further includes the following steps: When it is detected that there is residual water or gas in the gas well, at the lower part of the emergency working section and at a position where the original perforation at the bottom of the gas well is ≥ 50 cm, use a self-expanding plug for sealing, and discharge the water or gas by suction; When it is detected that there are residues on the inner wall of the gas well, the pipe wall needs to be cleaned so that the height of the residues does not exceed 0.1 mm of the pipe wall; After completing the above steps, finally introduce dry nitrogen and conduct several thorough purges of the gas well.

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