A hydraulic energy storage liquid lifting device, system and control method

Abstract

The present invention provides a hydraulic energy storage liquid lifting device, system, and control method. The device comprises a water lifting assembly, a drainage chamber, a water storage chamber, and an energy storage chamber connected in sequence. The water lifting assembly comprises a main hydraulic pipe, a drainage pipe, a first piston, a second piston, and a transmission rod. The first and second pistons are respectively disposed at opposite ends of the transmission rod, which is interposed between the chambers to link the first and second pistons to the pistons in the drainage chamber and the energy storage chamber, respectively, forming a bidirectional piston cylinder. The drainage chamber, the water storage chamber, and the drainage pipe are connected by a one-way valve. The main hydraulic pipe is connected to one side of the drainage chamber. Rated pressure is applied to push the first piston to a fixed displacement, pumping accumulated fluid in the chamber into the drainage pipe. Simultaneously, the second piston is linked to squeeze nitrogen to store energy until the first piston loses pressure, releasing kinetic energy. This pushes the first piston back to create negative pressure in the drainage chamber, sucking accumulated fluid from the water storage chamber, and repeating the cycle. This achieves adjustable water lifting capacity and frequency, ensuring continuous and stable water lifting output.

Description

Technical Field

[0001] The present invention relates to the technical field of coalbed methane mining, and in particular to a hydraulic energy storage liquid lifting device and system, and a control method. Background Art

[0002] With the rapid development of society, energy demand continues to rise, and energy mining companies are facing major challenges such as diversification, sustainable and efficient production.

[0003] Coalbed methane, a hydrocarbon gas stored in coal seams, is primarily composed of methane, which is typically adsorbed on the surface of coal particles, with some remaining free in coal pores or dissolved in coalbed water. It is a mineral resource associated with coal and an unconventional natural gas. Its combustion products are primarily water and carbon dioxide, with virtually no other waste gases. This makes it a crucial player in the global energy transition. Compared to traditional fossil fuels like coal and oil, the use of coalbed methane can significantly reduce greenhouse gas emissions, thereby contributing to the fight against global climate change.

[0004] Currently, in the field of coalbed methane (CBM) extraction, unlike natural gas production, the initial stage of surface drilling and drainage generally requires the removal of large amounts of water from the coal seam. As a result, the well produces a large amount of water and little gas. Artificial lift equipment is used to bring the bottomhole liquid to the surface to reduce pressure. Subsequently, as the underground water is drained, the pressure near the wellbore drops, and gas is gradually desorbed and produced. In the middle stage of drainage, when the pressure near the wellbore drops to a certain level, gas production gradually increases and remains stable, while water production is very low or non-existent.

[0005] However, as gas wells age, some components of the coalbed methane (CBM) gradually condense within the wellbore, forming condensate accumulations. This condensate can hinder gas flow and reduce gas transmission efficiency. This accumulation can even lead to partial blockages in gathering and transmission pipelines, impacting gas well production and even causing production shutdowns. Furthermore, because the amount of this accumulated liquid varies depending on the region, season, and environment, designing a water-lifting solution with adjustable drainage and guaranteed continuous and stable output is a pressing technical challenge facing those skilled in the art. Summary of the Invention

[0006] The main purpose of the present invention is to provide a hydraulic energy storage liquid lifting device and system, and a control method to achieve adjustable water lifting volume and water lifting frequency, ensuring continuous and stable water lifting output.

[0007] To achieve the above objectives, according to one aspect of the present invention, a hydraulic energy storage liquid lifting device is provided, comprising: a water lifting assembly, and a drainage tank, a water storage tank, and an energy storage tank connected in sequence, wherein the water storage tank is provided with a water diversion window, and the energy storage tank is filled with nitrogen. The water lifting assembly comprises: a main hydraulic pipe, a drainage pipe, a first piston, a second piston, and a transmission rod, wherein the first piston and the second piston are respectively disposed at both ends of the transmission rod, and the transmission rod is inserted between each tank to link the first piston and the second piston to the pistons of the drainage tank and the energy storage tank, respectively, to form a bidirectional piston cylinder. The drainage tank, the water storage tank, and the drainage pipe are connected by either a one-way valve or a three-way pipeline consisting of a pressure control valve and a one-way valve. The main hydraulic pipe is connected to one side of the drainage tank, and a rated pressure is applied to push the first piston to a fixed displacement, thereby pumping the accumulated liquid in the tank into the drainage pipe. At the same time, the main hydraulic pipe links the first piston to the second piston to squeeze the nitrogen to store energy until the first piston loses pressure and releases kinetic energy, pushing the first piston back to create negative pressure in the drainage tank, thereby sucking the accumulated liquid in the water storage tank, and repeating the cycle.

[0008] In a possible preferred embodiment, the water lifting assembly further includes: an auxiliary hydraulic pipe, which is respectively connected to the main hydraulic pipe and one side of the energy storage bin to synchronously apply pressure to the second piston, and the outer walls of the drainage bin, water storage bin, and energy storage bin are respectively provided with jackets, and the auxiliary hydraulic pipe and drainage pipe are arranged in the jackets.

[0009] In a possible preferred embodiment, the hydraulic energy storage liquid lifting device also includes: a manifold assembly, wherein the manifold assembly includes: a cluster cover, a beam sleeve, a load-bearing cable, and a connecting pipe seat, the connecting pipe seat is fixed on the top of the drainage bin, the load-bearing cable is connected to the connecting pipe seat, the pipes of the main hydraulic pipe and the drainage pipe extend outward through the connecting pipe seat, the cluster cover is sleeved on the outside of the main hydraulic pipe, the drainage pipe and the load-bearing cable, and the waist hole set at one end of the cluster cover limits the main hydraulic pipe, the drainage pipe and the load-bearing cable to be arranged in a line, and are clamped by the beam sleeve to space each other.

[0010] In a possible preferred embodiment, the water lifting component also includes: a debubble device, wherein the debubble device includes: a sleeve, on the tube body of which a plurality of blades are annularly spaced, the debubble device is stored in the water storage tank, connected to the transmission rod through the sleeve, and is driven by the transmission rod to move back and forth in the water storage tank.

[0011] In a possible preferred embodiment, the water lifting assembly further comprises: a crushing and pressure blocking member, which is arranged at both ends of the water storage tank, wherein both ends of the sleeve of the debubbler are streamlined, and a guide seat adapted to the shape of the two ends of the sleeve is provided on the front side of the crushing and pressure blocking member.

[0012] In a possible preferred embodiment, the hydraulic energy storage liquid lifting device further includes: a filter cover, which is sleeved on the water storage tank and sealed at each water diversion window.

[0013] In order to achieve the above-mentioned purpose, corresponding to the above-mentioned device, according to another aspect of the present invention, a hydraulic energy storage liquid lifting system is also provided, which includes: a hydraulic pump station, a hoisting unit, a master controller, a water level monitoring device, and a water pressure pump group, wherein the water pressure pump group adopts any of the hydraulic energy storage liquid lifting devices described above, the hoisting unit is hoisted to the water pressure pump group to lift it up and down the well, the hydraulic pump station is connected to the main hydraulic pipe of the water pressure pump group, the water level monitoring device is communicatively connected to the master controller to transmit the downhole water level data, the master controller is controlled and connected to the hydraulic pump station, and the hydraulic pump station is controlled according to the water level data to output the rated hydraulic pressure according to the preset pressure cycle, and the water pressure pump group is controlled to lift water in a quantitative manner.

[0014] In a possible preferred embodiment, the hydraulic energy storage liquid lifting system further includes: a flushing pump station, which is connected to the drainage pipe of the water pressure pump group and inputs rated high-pressure water for flushing into the drainage tank and water storage tank of the water pressure pump group through a three-way pipeline.

[0015] In order to achieve the above object, corresponding to the above system, according to another aspect of the present invention, there is also provided a control method for any of the above hydraulic energy storage liquid lifting systems, the steps of which include:

[0016] Step S1: Based on the downhole water level data, the hydraulic pump station adjusts the pressure cycle and outputs the rated hydraulic pressure, applying intermittent pressure to push the first piston to a fixed displacement, thereby regulating the amount of accumulated liquid in the drainage chamber and pressing it into the drainage pipe. At the same time, the second piston is linked to squeeze nitrogen for a fixed amount of energy storage.

[0017] Step S2 controls the hydraulic pump station to intermittently lose pressure according to the pressure application cycle, releases kinetic energy, pushes back the second piston and resets the first piston, so as to create a quantitative negative pressure in the drainage tank and suck out a quantitative amount of accumulated liquid in the water storage tank;

[0018] Step S3 repeats steps S1 to S2 cyclically.

[0019] In a possible preferred embodiment, the control method of the hydraulic energy storage liquid lifting system further includes the following steps:

[0020] Step S4 sets the backwash water pressure. When the backwash mode is entered, the hydraulic pump station is stopped and the first piston is waited for to reset.

[0021] Step S5 starts the flushing pump station, injects rated high-pressure water into the drain pipe in reverse, and then flows into the drainage tank and the water storage tank through the three-way pipe for flushing.

[0022] Through the hydraulic energy storage liquid lifting device, system and control method provided by the present invention, a double-headed piston water lifting component is cleverly designed to be connected to a single-tube pump body structure composed of a drainage tank, a water storage tank and an energy storage tank connected in sequence, thereby forming a double-piston reciprocating suction / pressure lifting single-tube water pressure pump group, thereby supporting the control of the single water lifting volume and water lifting frequency based only on the output intermittent cycle and rated hydraulic pressure of the hydraulic pump station, so as to adapt to the drainage efficiency requirements when various water levels change in the well, and ensure continuous and stable water lifting output.

[0023] In addition, in the corresponding embodiment, by setting up a debubbler, large bubbles in the underground water entering the water storage tank can be punctured during the water lifting process, achieving gas-liquid separation and reducing the amount of gas entering the drain pipe, thereby further ensuring the continuous stability of the water lifting output. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0025] Figure 1 Schematic diagram of the overall structure of the first embodiment of the hydraulic energy storage liquid lifting device of the present invention;

[0026] Figure 2 This is a schematic diagram of the assembly structure of the first embodiment of the hydraulic energy storage liquid lifting device of the present invention;

[0027] Figure 3 A schematic diagram of a first side half-section structure of a first embodiment of a hydraulic energy storage liquid lifting device of the present invention;

[0028] Figure 4 A partially enlarged schematic diagram of the structure of the hydraulic energy storage liquid lifting device according to the first embodiment of the present invention is shown in half section;

[0029] Figure 5 It is a schematic diagram of a partial half-section structure of the second side of the first embodiment of the hydraulic energy storage liquid lifting device of the present invention;

[0030] Figures 6 to 8 They are perspective structural diagrams of the drainage tank, the water storage tank, and the energy storage tank in the hydraulic energy storage liquid lifting device of the present invention;

[0031] Figure 9 This is a schematic diagram of the arrangement of the three-way valve between the drainage tank, the water storage tank and the drainage pipe in the hydraulic energy storage liquid lifting device of the present invention;

[0032] Figure 10 Schematic diagram of the overall structure of the second embodiment of the hydraulic energy storage liquid lifting device of the present invention;

[0033] Figure 11 This is a schematic diagram of the assembly structure of the second embodiment of the hydraulic energy storage liquid lifting device of the present invention;

[0034] Figure 12 A schematic diagram of a first side half-section structure of a second embodiment of a hydraulic energy storage liquid lifting device of the present invention;

[0035] Figure 13 A schematic diagram of a half-sectioned connection structure of a debubbler and a crushing and pressure-blocking member in a water storage tank of a second embodiment of a hydraulic energy storage liquid lifting device of the present invention;

[0036] Figure 14 This is a schematic structural diagram of a debubbler of a second embodiment of a hydraulic energy storage liquid lifting device of the present invention;

[0037] Figure 15 A schematic diagram of a half-section structure of a debubbler and a crushing and pressure-blocking member of a second embodiment of a hydraulic energy storage liquid lifting device of the present invention;

[0038] Figure 16 It is a structural schematic diagram of the hydraulic energy storage liquid lifting system of the present invention;

[0039] Figure 17 Schematic diagram of the steps of the control method of the hydraulic energy storage liquid lifting system of the present invention.

[0040] Description of Reference Numerals

[0041] Drainage tank 1, water storage tank 2, energy storage tank 3, water lifting assembly 4, manifold assembly 5, filter cover 6, hydraulic pump station 7, hoisting unit 8, master controller 9, flushing pump station 11, water pressure pump group 99, water diversion window 21, inflatable protective cover 31, main hydraulic pipe 41, drainage pipe 42, first piston 43, second piston 44, transmission rod 45, transmission port 46, one-way valve 47, pressure control valve 48, auxiliary hydraulic pipe 48, debubbler 49, sleeve 491, blade 492, crushing and pressure stopper 493, first channel 411, second channel 412, third channel 413, fourth channel 414, cluster cover 51, beam sleeve 52, load-bearing rope 53, connecting pipe seat 54, waist hole 511, power fluid tank 71, filter 72. DETAILED DESCRIPTION

[0042] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0043] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0044] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0045] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, or are the orientation or positional relationship in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do 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 limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance. The terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0046] Furthermore, terms such as "horizontal," "vertical," and "overhanging" do not necessarily imply that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0047] In the description of the present invention, it should also be noted that, unless otherwise clearly specified and limited, the terms "setting", "layout", "installation", "connection", and "connection" 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 a connection between the 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 and in combination with the existing technology. In addition, the embodiments of the present invention and the features in the embodiments can be combined with each other unless there is a conflict. And one or more of the components in the diagram may be necessary or non-essential, and the relative positional relationship between the components in the above diagram can be adjusted according to actual needs.

[0048] Currently, in the actual production process of gas wells, the underground water accumulation process is affected by multiple factors such as geological structure, hydrogeological conditions, and mining activities, and exhibits significant nonlinear characteristics, resulting in dynamic fluctuations in the bottomhole water level. At the same time, considering the limited underground working space, if a traditional water pump structure is used, the cross-sectional space will be large, which will occupy a large wellbore space. Therefore, the present invention intends to design a single-tube water pump structure with a thin tube diameter. Functionally, it can support dynamic adjustment of the driving power of the wellhead hydraulic pump based on water level analysis data, thereby controlling the underground water lifting volume and adjustable water lifting frequency while ensuring continuous and stable water lifting output.

[0049] For this reason, Figures 1 to 9 As shown, the present invention provides a hydraulic energy storage liquid lifting device, which includes: a drainage tank 1, a water storage tank 2, an energy storage tank 3, and a water lifting component 4, wherein Figures 1 to 3 As shown, in this example, the drainage tank 1, the water storage tank 2, and the energy storage tank 3 adopt a modular design, and the tank bodies are connected in sequence to form a compact single-tube structure. For example, the outer diameter is preferably set to Φ120mm, and 316L stainless steel is preferably used to have excellent acid and corrosion resistance (corrosion resistance level ≥ ASTM G31 standard). A water diversion window 21 is provided on the water storage tank 2 to guide the accumulated liquid in the well into the water storage tank 2. The energy storage tank 3 is filled with nitrogen. The water lifting component 4 includes: a main hydraulic pipe 41, a drainage pipe 42, a first piston 43, a second piston 44, and a transmission rod 45.

[0050] Among them Figures 2 to 5 As shown, the first piston 43 and the second piston 44 are respectively arranged at both ends of the transmission rod 45, and the connection between the drainage tank 1, the energy storage tank 3 and the water storage tank 2 are respectively provided with a sealed transmission port 46, so that the transmission rod 45 can be inserted between the tanks, and the first piston 43 and the second piston 44 are respectively connected to the drainage tank 1 and the energy storage tank 3 pistons, thereby making the water lifting component 4 and the drainage tank 1 and the energy storage tank 3 form a two-way piston cylinder structure, and at the same time, the inner cavity of the drainage tank 1 and the energy storage tank 3 are separated into two side sealed cavities through each piston, wherein the second side inner cavity of the drainage tank 1 is respectively connected to the water storage tank 2 and the drainage pipe 42 by a one-way valve 47, and the main hydraulic pipe 41 is connected to the first side inner cavity of the drainage tank 1, and the nitrogen filled in the energy storage tank 3 is located in the second side inner cavity of the energy storage tank 3.

[0051] With this arrangement, when the main hydraulic pipe 41 outputs power fluid to the first side inner cavity of the drainage tank 1 and the rated pressure pushes the first piston 43 to a quantitative displacement, the quantitative accumulated fluid in the second side inner cavity of the drainage tank 1 can be pressed into the drainage pipe 42 along the way, and at the same time, the second piston 44 is linked through the transmission rod 45 to squeeze the nitrogen in the energy storage tank 3 for quantitative energy storage. When the main hydraulic pipe 41 stops applying pressure intermittently periodically, the first piston 43 loses pressure, and the nitrogen in the energy storage tank 3 releases kinetic energy, pushing the second piston 44 to push back the first piston 43 to create a rated negative pressure in the second side inner cavity of the drainage tank 1, thereby sucking the quantitative accumulated fluid in the water storage tank 2. This cycle is repeated to ensure continuous and stable water lifting output.

[0052] In addition, it is worth mentioning that, through the structure of the above example, since this solution adopts a single-tube water pressure structure with double pistons reciprocating suction / pressure lifting, the diameter of the single tube can be designed to be thinner than the existing technology, and the maximum single water lifting volume can be adjusted or maintained by increasing the length of each compartment section. Therefore, the cross-sectional space occupied in the well is relatively small, which can provide sufficient space for other underground operating equipment.

[0053] On the other hand, the single-tube water pressure structure with double pistons reciprocating suction / pressure lifting can also support the overall control of the device's single water lifting volume and lifting frequency by adjusting the intermittent pressure interval and pressure amount of the main hydraulic pipe 41, so that the hydraulic energy storage liquid lifting device of the present invention can freely adjust the water lifting efficiency, thereby meeting the downhole drainage requirements in different application scenarios.

[0054] Furthermore, in order to optimize the pressure stability of the water lifting component 4 in the drainage chamber 1 and the energy storage chamber 3, as shown in FIG. Figure 5 As shown, in an optional embodiment, the water lifting assembly 4 further includes: an auxiliary hydraulic pipe 48, which is respectively connected to the main hydraulic pipe 41 and the inner cavity of the first side of the energy storage bin 3 to synchronously apply pressure to the second piston 44. In order to ensure the appearance integrity of the single-tube structure of the hydraulic energy storage liquid lifting device of the present invention, in an optional example, as shown Figures 6 to 8 As shown, a jacket layer can be set on the outer wall of the drainage tank 1, the water storage tank 2, and the energy storage tank 3, and multiple channels can be opened in the jacket layer to connect and combine with each other.

[0055] For example Figure 4 As shown, a first channel 411 communicating with the inner cavity of the second side of the drainage chamber 1 can be provided on the first side of the inner layer of the drainage chamber 1 to replace the drainage pipe 42; for example Figure 5As shown, a second channel 412 can be opened on the second side of the jacket of the drainage chamber 1, and simultaneously communicated with the third and fourth channels 414, 413, and 414 opened in the jackets of the water storage chamber 2 and the energy storage chamber 3. At the same time, the fourth channel 414 in the jacket of the energy storage chamber 3 is also connected to the inner cavity on the first side thereof, thereby replacing the auxiliary hydraulic pipe 48, thereby making the device appearance complete and integrated. In other optional embodiments, the auxiliary hydraulic pipe 48 and the drainage pipe 42 can also be arranged in the jacket to achieve the same effect.

[0056] Furthermore, considering that during underground operations, the equipment of the present invention needs to be hoisted down the well, and at the same time, it is necessary to provide support and load-bearing for various pipelines, and to prevent various pipelines from being knotted and entangled, so as to facilitate extension to the well to connect with ground equipment. For this reason, in a preferred embodiment, the hydraulic energy storage liquid lifting device also includes: a manifold assembly 5, wherein the manifold assembly 5 includes: a cluster cover 51, a beam sleeve 52, a load-bearing rope 53, and a connecting pipe seat 54, the connecting pipe seat 54 is fixed on the top of the drainage tank 1, and the load-bearing rope 53 is connected to the The pipes of the main hydraulic pipe 41 and the drainage pipe 42 extend outward through the pipe socket 54, and the cluster cover 51 is sleeved on the outside of the main hydraulic pipe 41, the drainage pipe 42 and the load-bearing rope 53. The waist hole 511 set at one end of the cluster cover 51 limits the main hydraulic pipe 41, the drainage pipe 42 and the load-bearing rope 53 to be arranged in a line, and are clamped with the beam sleeve 52 to space each other, so as to avoid pipeline entanglement. At the same time, it is connected to the ground lifting equipment through the load-bearing rope 53 to solve the lifting load-bearing and pipeline management problems.

[0057] Furthermore, considering that there may be large particles in the underground water, the drainage pipe 42 and the inner cavity of the drainage tank 1 may be blocked or polluted during the water lifting process. Therefore, in order to solve these problems, the present invention provides a backwashing solution. In an optional embodiment, as shown in FIG. Figure 9 As shown, the drainage tank 1 can be connected to the water storage tank 2 and the drainage pipe 42 by a three-way pipeline consisting of a pressure control valve 48 and a one-way valve 47. Through this arrangement, by connecting the drainage pipe 42 to the ground pump station, high-pressure water can be reversely input to the drainage pipe 42, thereby flushing the pressure control valve 48 and entering the drainage tank 1 and the water storage tank 2 for reverse flushing to solve the blockage or pollution problem.

[0058] Furthermore, in order to filter out large particles in the underground water and prevent the drain pipe 42 from being frequently blocked, in an optional embodiment, as Figures 10 and 11 As shown, the hydraulic energy storage liquid lifting device also includes: a filter cover 6, wherein a plurality of filter holes are opened on the filter cover 6, which is sleeved on the water storage tank 2 and sealed at each water diversion window 21 to filter the underground water and prevent large particles from entering the water storage tank 2 to form a filtering effect.

[0059] In addition, considering that the underground water usually carries a lot of bubbles, there is a lot of gas in the drainage pipe 42 or the drainage tank 1 during operation, which is easy to affect the water lifting efficiency. Figures 11 to 14 As shown, in an optional embodiment, the water lifting component 4 further includes: a debubbler 49, wherein the debubbler 49 is as shown in FIG. Figure 14 As shown, it includes: a sleeve 491, on which a plurality of blades 492 are arranged at annular intervals. The debubbler 49 is accommodated in the water storage tank 2 and is connected to the transmission rod 45 through the sleeve 491. Driven by the transmission rod 45, it moves back and forth in the water storage tank 2, thereby puncturing large bubbles in the underground water in the water storage tank 2 to achieve gas-liquid separation and reduce the amount of gas entering the drain pipe 42, thereby further ensuring the continuous stability of the water lifting output.

[0060] Furthermore, considering that even after the underground water is filtered by the filter cover 6, there will still be some medium or small particles, so in order to further break up these particles and avoid pipeline blockage, Figure 15 As shown, in an optional embodiment, the water-lifting component 4 further includes: a crushing and pressure stopper 493, which is arranged at both ends of the water storage tank 2, wherein both ends of the sleeve 491 of the debubbler 49 are preferably streamlined to reduce water resistance and reduce kinetic energy loss, and the front side of the crushing and pressure stopper 493 is provided with a guide seat adapted to the shape of the two ends of the sleeve 491.

[0061] With this arrangement, the debubbler 49 can agitate and puncture large bubbles while simultaneously utilizing the reciprocating motion of the two ends of the sleeve 491 to cooperate with the crushing block 493 to crush particulate matter, thereby crushing some of the particulate matter in the accumulated water and ensuring smooth flow of the pipeline. It is also worth mentioning that this entire treatment process is completed by utilizing the piston movement during the water lifting process, without the need for additional power control. Therefore, the structure fully utilizes the reasonable space within the water storage tank 2 and the piston movement during the water lifting process, cleverly preventing the accumulation of water from being blocked.

[0062] Furthermore, in order to facilitate the filling of nitrogen into the energy storage bin 3, in an optional embodiment, an inflatable protective cover 31 is provided at the bottom of the energy storage bin 3 to seal the filled nitrogen and provide protection.

[0063] Through the above example scheme, those skilled in the art can know that since the device of the present invention adopts an independent pipeline design, the power fluid and coalbed methane are completely physically isolated, fundamentally eliminating the possibility of cross-contamination. In addition, the power source can use water or hydraulic oil according to actual conditions, making the power source more selective and adaptable. The bidirectional piston cylinder structure of the present device can support the use of existing cylinder sealing structure, so the sealing performance can ensure that it meets the API 6A PSL3 level standard and achieves zero leakage at a working pressure of 35MPa. In addition, in an optional implementation, the drainage pipe 42 pipeline can also adopt a large curvature optimization design and cooperate with a high-efficiency hydraulic drive device to ensure the continuity and stability of the drainage process.

[0064] On the other hand, Figure 16 As shown, corresponding to the above-mentioned device, the present invention also provides a hydraulic energy storage liquid lifting system, an example of which includes: a hydraulic pump station 7, a hoisting unit 8, a master controller 9, a water level monitoring device, and a water pressure pump group 99, wherein the water pressure pump group 99 adopts the hydraulic energy storage liquid lifting device described in any of the above examples, the hoisting unit 8 is hoisted with the manifold assembly 5 of the water pressure pump group 99 to lift it up and down the well, the hydraulic pump station 7 is connected to the main hydraulic pipe 41 of the water pressure pump group 99, wherein the power liquid tank 71 in the hydraulic pump station 7 can be provided with a filter 72 to filter the power liquid, and the water level monitoring device can be separately set underground or on the water pressure pump group 99, such as in the water storage tank 2, in an optional embodiment, wherein the water level monitoring device is communicatively connected to the master controller 9 to transmit underground water level data, and the master controller 9 is control-connected to the hydraulic pump station 7 to control the hydraulic pump station 7 according to the water level data, output the rated hydraulic pressure according to the preset pressure cycle, thereby controlling the water pressure pump group 99 to lift water in a quantitative manner.

[0065] In addition, in an optional embodiment, in order to support the cleaning function, the hydraulic energy storage liquid lifting system may also include: a flushing pump station 11, wherein the flushing pump station 11 is connected to the drainage pipe 42 of the water pressure pump group 99, and inputs rated high-pressure water for flushing into the drainage tank 1 and the water storage tank 2 of the water pressure pump group 99 through a three-way pipeline.

[0066] On the other hand, Figure 17 As shown, corresponding to the above system example, the present invention also provides a control method for the hydraulic energy storage liquid lifting system as described above, the steps of which include:

[0067] Step S1 adjusts the pressure cycle of the hydraulic pump station 7 and outputs the rated hydraulic pressure according to the downhole water level data, and intermittently applies pressure to push the first piston 43 to a fixed displacement, thereby regulating the amount of accumulated liquid in the drainage chamber 1 that is pressed into the drainage pipe 42, and simultaneously drives the second piston 44 to squeeze nitrogen for a fixed amount of energy storage;

[0068] In step S2, according to the pressure application cycle, the hydraulic pump station 7 is controlled to intermittently lose pressure, release kinetic energy, push back the second piston 44, and reset the first piston 43, so as to create a quantitative negative pressure in the drainage tank 1 and suck a quantitative amount of accumulated liquid in the water storage tank 2;

[0069] Step S3 repeats steps S1 to S2 cyclically.

[0070] In addition, in order to adapt to the cleaning function, in an optional embodiment, the control method of the hydraulic energy storage liquid lifting system further includes the following steps:

[0071] Step S4 sets the backwash water pressure. When the backwash mode is entered, the hydraulic pump station 7 is stopped and the first piston 43 is waited for to be reset.

[0072] Step S5 starts the flushing pump station 11, reversely injects rated high-pressure water into the drainage pipe 42, and then flows into the drainage tank 1 and the water storage tank 2 through the three-way pipe for flushing.

[0073] In addition, after completing the above cleaning step, the above steps S1 to S3 may be continued to be performed to repeatedly start a new cycle of water lifting operation, thereby forming a large cycle operation combining cleaning and water lifting.

[0074] In summary, through the hydraulic energy storage liquid lifting device, system and control method provided by the present invention, a double-headed piston water lifting component 4 is cleverly designed to be connected to a single-tube pump body structure composed of a drainage tank 1, a water storage tank 2, and an energy storage tank 3 connected in sequence, thereby forming a double-piston reciprocating suction / pressure lifting single-tube water pump group 99, thereby supporting the control of a single water lifting volume and water lifting frequency based only on the output intermittent cycle and rated hydraulic pressure of the hydraulic pump station 7, so as to adapt to the drainage efficiency requirements when various water levels change in the well, and ensure continuous and stable water lifting output.

[0075] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made based on the contents of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can better understand and utilize the present invention. The present invention is only limited by the claims and their full scope and equivalents. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0076] In addition, all or part of the steps in the above-mentioned embodiments can be implemented by instructing the relevant hardware through a program. The program is stored in a storage medium and includes a number of instructions for causing a single-chip microcomputer, chip, or processor to execute all or part of the steps of the methods described in each embodiment of the present application. The aforementioned storage medium includes: a USB flash drive, a mobile hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, etc., various media that can store program code.

[0077] In addition, various implementations of the embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the embodiments of the present invention, they should also be regarded as the contents disclosed in the embodiments of the present invention.

Claims

1. A hydraulic energy storage liquid lifting device, comprising: A water-lifting assembly, and a drainage tank, a water storage tank, and an energy storage tank connected in sequence, wherein the water storage tank is provided with a water diversion window, and the energy storage tank is filled with nitrogen. The water-lifting assembly includes: a main hydraulic pipe, a drainage pipe, a first piston, a second piston, a transmission rod, a defoamer, and a crushing and pressure stopper. The first piston and the second piston are respectively arranged at both ends of the transmission rod, and the transmission rod is inserted between each tank to link the first piston and the second piston to be connected to the drainage tank and the energy storage tank piston respectively to form a two-way piston cylinder. The drainage tank and the water storage tank and the drainage pipe are connected by a one-way valve or a three-way pipeline composed of a pressure control valve and a one-way valve. The main hydraulic pipe is connected to the drainage tank. On the other side, the rated pressure pushes the first piston to move quantitatively, and the accumulated liquid in the tank is fluidized into the drain pipe along the way, and at the same time, the second piston is linked to squeeze the nitrogen to store energy until the first piston loses pressure and releases kinetic energy, and pushes back the first piston to create negative pressure in the drainage tank, sucking the accumulated liquid in the water storage tank, and repeating the cycle. The debubbler includes: a sleeve, a plurality of blades are arranged at annular intervals on the tube body, the debubbler is accommodated in the water storage tank, and is connected to the transmission rod through the sleeve, and is driven by the transmission rod to move back and forth in the water storage tank, wherein the crushing pressure stopper is arranged at both ends of the water storage tank, wherein the sleeve ends of the debubbler are streamlined, and the front side of the crushing pressure stopper is provided with a guide seat adapted to the shape of the two ends of the sleeve.

2. The hydraulic energy storage liquid lifting device according to claim 1, wherein the water lifting assembly further comprises: The auxiliary hydraulic pipe is respectively connected to the main hydraulic pipe and one side of the energy storage bin to synchronously apply pressure to the second piston. The outer walls of the drainage bin, water storage bin and energy storage bin are respectively provided with jackets, and the auxiliary hydraulic pipe and drainage pipe are arranged in the jackets.

3. The hydraulic energy storage liquid lifting device according to claim 1, further comprising: A manifold assembly, wherein the manifold assembly includes: a cluster cover, a cluster sleeve, a load-bearing cable, and a connecting pipe seat. The connecting pipe seat is fixed on the top of the drainage bin, the load-bearing cable is connected to the connecting pipe seat, the pipes of the main hydraulic pipe and the drainage pipe extend outward through the connecting pipe seat, the cluster cover is sleeved on the outside of the main hydraulic pipe, the drainage pipe and the load-bearing cable, and the waist hole set at one end of the cluster cover limits the main hydraulic pipe, the drainage pipe and the load-bearing cable to be arranged in a line, and are clamped by the cluster sleeve to space each other.

4. The hydraulic energy storage liquid lifting device according to claim 1, further comprising: The filter cover is sleeved on the water storage bin and sealed at each water inlet window.

5. A hydraulic energy storage liquid lifting system comprising: A hydraulic pump station, a hoisting unit, a master controller, a water level monitoring device, and a water pressure pump group, wherein the water pressure pump group adopts the hydraulic energy storage liquid lifting device as described in any one of claims 1 to 4, the hoisting unit is hoisted to the water pressure pump group to lift it up and down the well, the hydraulic pump station is connected to the main hydraulic pipe of the water pressure pump group, the water level monitoring device is communicatively connected to the master controller to transmit downhole water level data, the master controller is controlled and connected to the hydraulic pump station, and according to the water level data, the hydraulic pump station is controlled to output the rated hydraulic pressure according to the preset pressure cycle, and the water pressure pump group is controlled to lift water in a quantitative manner.

6. The hydraulic energy storage liquid lifting system according to claim 5, further comprising: The flushing pump station is connected to the drainage pipe of the water pressure pump group, and inputs rated high-pressure water for flushing into the drainage tank and water storage tank of the water pressure pump group through a three-way pipeline.

7. A method for controlling the hydraulic energy storage liquid lifting system according to any one of claims 5 to 6, comprising the steps of: Step S1: Based on the downhole water level data, the hydraulic pump station adjusts the pressure cycle and outputs the rated hydraulic pressure, applying intermittent pressure to push the first piston to a fixed displacement, thereby regulating the amount of accumulated liquid in the drainage chamber and pressing it into the drainage pipe. At the same time, the second piston is linked to squeeze nitrogen for a fixed amount of energy storage. Step S2 controls the hydraulic pump station to intermittently lose pressure according to the pressure application cycle, releases kinetic energy, pushes back the second piston and resets the first piston, so as to create a quantitative negative pressure in the drainage tank and suck out a quantitative amount of accumulated liquid in the water storage tank; Step S3 repeats steps S1 to S2 cyclically.

8. The control method according to claim 7, further comprising: Step S4 sets the backwash water pressure. When the backwash mode is entered, the hydraulic pump station is stopped and the first piston is waited for to reset. Step S5 starts the flushing pump station, injects rated high-pressure water into the drain pipe in reverse, and then flows into the drainage tank and the water storage tank through the three-way pipe for flushing.

Images