Hydraulic energy storage liquid lifting device and system and control method

Abstract

The invention provides a hydraulic energy storage liquid lifting device and system and a control method.The device comprises a water lifting assembly, a drainage bin, a water storage bin and an energy storage bin, the drainage bin, the water storage bin and the energy storage bin are sequentially connected, the water lifting assembly comprises a main hydraulic pipe, a drainage pipe, a first piston, a second piston and a transmission rod, and the first piston and the second piston are arranged at the two ends of the transmission rod correspondingly; a transmission rod is inserted among the bins to link a first piston and a second piston to be respectively connected with pistons of the drainage bin and the energy storage bin to form a two-way piston cylinder, the drainage bin is communicated with the water storage bin and the drainage pipe through one-way valves, a main hydraulic pipe is connected to one side of the drainage bin, rated pressure is applied to push the first piston to move quantitatively, and accumulated water in the bins is pressed into the drainage pipe on the way. Meanwhile, the second piston is linked to extrude nitrogen for energy storage until the first piston loses pressure, kinetic energy is released, the first piston is pushed back to produce negative pressure in the drainage bin, accumulated liquid in the water storage bin is sucked, and the cycle is repeated. Therefore, the water lifting amount and the water lifting frequency are adjustable, and continuous and stable water lifting output is ensured.

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, as a hydrocarbon gas stored in coal seams, is mainly composed of methane, which is usually adsorbed on the surface of coal matrix particles, partially free in coal pores, or dissolved in coal seam water. It is a mineral resource associated with coal and an unconventional natural gas. Its combustion products are mainly water and carbon dioxide, and almost no other waste gas is produced, which makes it occupy a pivotal position in the transformation of the global energy structure. Compared with traditional fossil energy such as coal and oil, the use of coalbed methane can significantly reduce greenhouse gas emissions, thus helping to cope with global climate change.

[0004] At present, in the field of coalbed methane mining, unlike natural gas production, in the early stage of coalbed methane ground drilling and drainage, a large amount of water in the coal seam generally needs to be drained, so the gas well produces a large amount of water and basically no gas. For example, artificial lifting equipment is used to bring the bottom of the well to the surface to achieve drainage and pressure reduction. After that, as the underground water is discharged, the pressure near the wellbore drops, and gas is gradually desorbed and produced. When the pressure near the wellbore drops to a certain level after entering the middle stage of drainage, the gas production will gradually increase and remain stable, while the water production will be very low or no water will be produced.

[0005] However, as the gas wells age, some components in the coalbed methane will gradually condense in the wellbore, forming condensate accumulation, which will hinder the flow of gas and reduce the gas transmission efficiency. The accumulation of liquid may even cause partial blockage of the gathering and transportation pipeline, affecting the gas well production and even causing the risk of shutdown. At the same time, since the amount of such accumulation of liquid varies according to different regions, seasons and environments, how to design a water-lifting scheme with adjustable drainage and ensuring continuous and stable output is a technical problem that technicians in this field urgently need to solve. 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, and ensure continuous and stable water lifting output.

[0007] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, a hydraulic energy storage liquid lifting device is provided, which comprises: a water lifting component, 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 component 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 arranged at both ends of the transmission rod, and the transmission rod is inserted between each tank, so as to link the first piston and the second piston to be connected with the drainage tank and the energy storage tank pistons respectively to form a two-way piston cylinder, and the drainage tank is connected with the water storage tank and the drainage pipe by a one-way valve or a three-way pipeline composed of a pressure control valve and a one-way valve, and the main hydraulic pipe is connected to one side of the drainage tank, and the rated pressure is applied to push the first piston to quantitatively displace, and the accumulated liquid in the tank is pumped into the drainage pipe along the way, and the second piston is linked to squeeze the nitrogen to store energy, until the first piston releases kinetic energy when the pressure is lost, and pushes back the first piston to create negative pressure in the drainage tank, and sucks the accumulated liquid in the water storage tank, and the cycle is repeated.

[0008] In a possible preferred embodiment, the water lifting assembly also 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, the water storage bin and the energy storage bin are respectively provided with casing layers, and the auxiliary hydraulic pipe and the drainage pipe are arranged in the casing layers.

[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 splitter sleeve, a load-bearing rope, and a connecting pipe seat, the connecting pipe seat is fixed on the top of the drainage bin, the load-bearing rope 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 rope, and the main hydraulic pipe, the drainage pipe and the load-bearing rope are limited to be arranged in a line through a waist hole set at one end of the cluster cover, and are clamped by the beam splitter sleeve to be spaced apart from 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 which a plurality of blades are arranged at intervals in an annular manner. 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 arranged 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 comprises: 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, there is also provided a hydraulic energy storage liquid lifting system, 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 quantitatively in a periodic 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, a control method of the hydraulic energy storage liquid lifting system as described above is also provided, and the steps include:

[0016] Step S1: According to the downhole water level data, the hydraulic pump station is adjusted to apply pressure and output the rated hydraulic pressure, so as to push the first piston to move quantitatively by applying pressure intermittently, and the amount of accumulated liquid in the drainage chamber pressed into the drainage pipe is regulated, and the second piston is linked to squeeze nitrogen to store quantitative energy;

[0017] Step S2 controls the hydraulic pump station to intermittently lose pressure according to the pressure cycle, releases kinetic energy, pushes back the second piston to link the first piston to reset, so as to create a quantitative negative pressure in the drainage tank and suck 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 comprises:

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

[0021] Step S5 starts the flushing pump station, injects rated high-pressure water into the drain pipe in reverse, and then pours it 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 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, so as to adapt to the drainage efficiency requirements when various water levels change in the well, and ensure continuous stability during water lifting output.

[0023] In addition, in the corresponding implementation manner, by setting up a debubbler, large bubbles in the underground water entering the water storage tank can be punctured during the water lifting process, thereby 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 drawings constituting a part of this application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0025] Figure 1 It is a 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 It 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 It is 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 It is a partially enlarged structural schematic diagram of a half-section of the first embodiment of the hydraulic energy storage liquid lifting device of the present invention;

[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 schematic diagrams of the drainage chamber, the water storage chamber, and the energy storage chamber in the hydraulic energy storage liquid lifting device of the present invention;

[0031] Fig. 9 It is a schematic diagram of the arrangement of the three-way pipeline 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] Fig.10 It is a schematic diagram of the overall structure of the second embodiment of the hydraulic energy storage liquid lifting device of the present invention;

[0033] Fig.11 It 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] Fig.12 It is 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] Fig.13 It is a schematic diagram of the half-section connection structure of the debubbler and the crushing and pressure blocking member in the water storage tank of the second embodiment of the hydraulic energy storage liquid lifting device of the present invention;

[0036] Fig.14 It 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] Fig.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] Fig.16 It is a structural schematic diagram of the hydraulic energy storage liquid lifting system of the present invention;

[0039] Fig.17 It is a 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, lifting 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, splitter sleeve 52, load-bearing rope 53, connecting pipe seat 54, waist hole 511, power fluid tank 71, filter 72. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here 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 claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[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, further definition and explanation thereof is not required 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" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the inventive product 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" and the like 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] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0047] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly stipulated and limited, the terms "set", "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 prior art. 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 position relationship between the components in the above diagram can be adjusted according to actual needs.

[0048] At present, 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, which will show significant nonlinear characteristics, resulting in dynamic fluctuations in the bottom water level of the well. At the same time, considering the limited underground working space, if the traditional pump structure design is adopted, the cross-sectional space will be large, which will occupy a large well diameter space. For this reason, the present invention intends to design a single-tube water pump structure with a thin tube diameter, and the function can support the dynamic adjustment of the driving power of the wellhead hydraulic pump according to the water level analysis data, so as to control the underground water lifting volume and the adjustable water lifting frequency, and ensure the 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), wherein the water storage tank 2 is provided with a water diversion window 21 to guide the accumulated liquid in the well into the water storage tank 2, and the energy storage tank 3 is filled with nitrogen. The water lifting assembly 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 the two ends of the transmission rod 45, and the connection between the drainage bin 1, the energy storage bin 3 and the water storage bin 2 are respectively provided with a sealed transmission port 46, so that the transmission rod 45 can be inserted between the bins, and the first piston 43 and the second piston 44 are respectively connected with the pistons of the drainage bin 1 and the energy storage bin 3, so that the water lifting component 4 and the drainage bin 1 and the energy storage bin 3 form a two-way piston cylinder structure, and at the same time, the inner cavity of the drainage bin 1 and the energy storage bin 3 is separated into two side sealed cavities through each piston, wherein the second side inner cavity of the drainage bin 1 is respectively connected with the water storage bin 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 bin 1, and the nitrogen filled in the energy storage bin 3 is located in the second side inner cavity of the energy storage bin 3.

[0051] With this arrangement, when the main hydraulic pipe 41 outputs power fluid to the first side cavity of the drainage tank 1 and the rated pressure pushes the first piston 43 to move quantitatively, the quantitative accumulated fluid in the second side 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 periodically stops applying pressure, 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 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 chamber section. Therefore, the occupied cross-sectional space in the well is smaller, which can provide sufficient space for other underground operating equipment.

[0053] On the other hand, the single-tube water-pressurizing structure with double pistons reciprocating suction / pressure lifting can also support overall control of the single water-lifting volume and water-lifting frequency of the device 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 underground drainage requirements in different application scenarios.

[0054] Furthermore, in order to optimize the pressure stability of the water lifting assembly 4 in the drainage chamber 1 and the energy storage chamber 3, as 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, wherein 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 Figures 6 to 8 As shown, a jacket layer can be set on the outer wall of the drainage bin 1, the water storage bin 2, and the energy storage bin 3, and a plurality of channels can be opened in the jacket layer to interconnect and combine.

[0055] For example Figure 4 As shown, a first channel 411 communicating with the inner cavity on the second side of the drainage bin 1 can be provided on the first side of the jacket of the drainage bin 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 drainage bin 1 jacket, and is connected to the third and fourth channels 414413, 414 opened in the water storage bin 2 and the energy storage bin 3 jackets, and the fourth channel 414 in the energy storage bin 3 jacket is also connected to the first side inner cavity, thereby replacing the auxiliary hydraulic pipe 48, so that the device appearance is complete and integrated. In addition, 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 corresponding 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 pipe connection seat 54, wherein the pipe connection seat 54 is fixed on the top of the drainage tank 1, and the load-bearing rope 53 is connected to the pipe. 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. Through the waist hole 511 set at one end of the cluster cover 51, the main hydraulic pipe 41, the drainage pipe 42 and the load-bearing rope 53 are limited to be arranged in a line, and are connected with each other through the beam sleeve 52 to avoid pipeline entanglement. At the same time, it is connected with 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. Fig. 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 into the drainage pipe 42, thereby flushing open 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 drainage pipe 42 from being frequently blocked, in an optional embodiment, as Figure 10 to Figure 11 As shown, the hydraulic energy storage liquid lifting device also includes: a filter cover 6, wherein the filter cover 6 is provided with a plurality of filter holes, which is sleeved on the water storage tank 2 and sealed at each water diversion window 21, so as 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 large amount of bubbles, a large amount of gas exists in the drainage pipe 42 or the drainage chamber 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 assembly 4 further includes: a debubbler 49, wherein the debubbler 49 is as shown in FIG. Fig.14 As shown, it includes: a casing 491, on which a plurality of blades 492 are arranged at annular intervals. The debubbler 49 is received in the water storage tank 2, and is connected to the transmission rod 45 via the casing 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, reduce the amount of gas entering the drainage pipe 42, and further ensure the continuous stability of the water lifting output.

[0060] Furthermore, considering that even after being filtered by the filter cover 6, there will still be some medium or small particles in the underground water, in order to further break up these particles and avoid pipeline blockage, such as Fig.15 As shown, in an optional embodiment, the water-lifting component 4 also includes: a crushing and pressure blocking member 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 a guide seat adapted to the shape of the two ends of the sleeve 491 is provided on the front side of the crushing and pressure blocking member 493.

[0061] Through this arrangement, the debubbler 49 can stir and puncture large bubbles, and at the same time, the two ends of the sleeve 491 can cooperate with the crushing block 493 during the reciprocating movement to crush the particles, thereby crushing some of the particles in the accumulated water to ensure the smooth flow of the pipeline. It is also worth mentioning that the entire treatment process is completed by the piston movement during the water lifting process without the need for additional power control. Therefore, the structure fully utilizes the reasonable space in the water storage tank 2 and the piston movement during the water lifting process to cleverly prevent the accumulated water from being blocked.

[0062] Furthermore, in order to facilitate the filling of nitrogen in 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, so that the power source has greater selectivity and adaptability. Among them, 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, Fig.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 hoist 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 in an optional embodiment can be separately arranged underground, or can be arranged on the water pressure pump group 99, such as in the water storage tank 2, wherein the water level monitoring device is communicatively connected with the master controller 9 to transmit the underground water level data, the master controller 9 is control-connected with the hydraulic pump station 7, and the hydraulic pump station 7 is controlled according to the water level data, and the rated hydraulic pressure is output according to the preset pressure cycle, thereby controlling the water pressure pump group 99 to lift water quantitatively in a periodic 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 drain 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, Fig.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 pushes the first piston 43 to move quantitatively by intermittent pressure, 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 quantitative energy storage;

[0068] Step S2 controls the hydraulic pump station 7 to intermittently lose pressure according to the pressure application cycle, releases kinetic energy, pushes back the second piston 44 and links the first piston 43 to reset, 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 to wait for the first piston 43 to 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 pipeline 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 pressure pump group 99, thereby supporting the control of a single water lifting volume and water lifting frequency only according to 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 stability during water lifting output.

[0075] The preferred embodiments of the present invention disclosed above are only used to help explain 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 according to the content 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 understand and use the present invention well. 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 embodiment method can be completed by instructing the relevant hardware through a program, and the program is stored in a storage medium, including a number of instructions to enable a single-chip microcomputer, a chip or a processor to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, RandomAccess Memory), disk or optical disk and other media that can store program codes.

[0077] In addition, various implementation modes 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 by the embodiments of the present invention.

Claims

1. A hydraulic energy storage liquid lifting device, comprising: A water lifting component, 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 component 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 arranged at both ends of the transmission rod, and the transmission rod is inserted between the tanks to link the first piston and the second piston to connect with the drainage tank and the energy storage tank pistons respectively to form a two-way piston cylinder, and the drainage tank is connected with the water storage tank and the drainage pipe 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 one side of the drainage tank, and the rated pressure pushes the first piston to move quantitatively, and the accumulated liquid in the tank is pumped into the drainage pipe along the way, and the second piston is linked to squeeze the nitrogen to store energy until the first piston releases kinetic energy when the pressure is lost, and pushes back the first piston to create negative pressure in the drainage tank, and sucks the accumulated liquid in the water storage tank, and the cycle is repeated.

2. The hydraulic energy storage liquid lifting device according to claim 1, wherein the water lifting assembly further comprises: Auxiliary hydraulic pipe, the auxiliary hydraulic pipe is respectively connected with 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, the water storage bin and the energy storage bin are respectively provided with jackets, and the auxiliary hydraulic pipe and the 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 rope, and a connecting pipe seat. The connecting pipe seat is fixed on the top of the drainage bin, the load-bearing rope 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 rope, and the waist hole set at one end of the cluster cover limits the main hydraulic pipe, the drainage pipe and the load-bearing rope to be arranged in a line, and are clamped by the cluster sleeve to be spaced apart from each other.

4. The hydraulic energy storage liquid lifting device according to claim 1, wherein the water lifting assembly further comprises: The debubble remover comprises: a sleeve, on the tube body of which a plurality of blades are arranged at intervals in an annular shape. The debubble remover is stored in the water storage bin, connected to the transmission rod via the sleeve, and is driven by the transmission rod to move back and forth in the water storage bin.

5. The hydraulic energy storage liquid lifting device according to claim 4, wherein the water lifting assembly further comprises: The crushing and pressure blocking member is arranged at both ends of the water storage bin, wherein both ends of the sleeve of the debubbler are streamlined, and a guide seat matching the shape of the two ends of the sleeve is arranged on the front side of the crushing and pressure blocking member.

6. 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 diversion window.

7. 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 6, 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.

8. The hydraulic energy storage liquid lifting system according to claim 7, further comprising: A 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.

9. A control method for the hydraulic energy storage liquid lifting system according to any one of claims 7 to 8, the steps comprising: Step S1: According to the downhole water level data, the hydraulic pump station is adjusted to apply pressure and output the rated hydraulic pressure, so as to push the first piston to move quantitatively by applying pressure intermittently, and the amount of accumulated liquid in the drainage chamber pressed into the drainage pipe is regulated, and the second piston is linked to squeeze nitrogen to store quantitative energy; Step S2 controls the hydraulic pump station to intermittently lose pressure according to the pressure cycle, releases kinetic energy, pushes back the second piston to link the first piston to reset, so as to create a quantitative negative pressure in the drainage tank and suck a quantitative amount of accumulated liquid in the water storage tank; Step S3 repeats steps S1 to S2 cyclically.

10. The control method according to claim 9, further comprising: Step S4 sets the backwash water pressure. When entering the backwash mode, the hydraulic pump station is stopped to wait for the first piston to reset. Step S5 starts the flushing pump station, injects rated high-pressure water into the drain pipe in reverse, and then pours it into the drainage tank and the water storage tank through the three-way pipe for flushing.

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