Automatic dredging method and system for ultra-deep well based on gas lift method

Abstract

The application provides an automatic dredging method and system for an ultra-deep well based on a gas lift method, and relates to the technical field of municipal engineering. The application comprises the following steps: S1: determining the silt parameters of the ultra-deep well based on an ultrasonic sludge level meter and an ultrasonic water level sensor, i.e. the distance between the water surface and the bottom of the ultra-deep well and the depth of the silt; S2: constructing an automatic dredging model for the ultra-deep well based on the gas lift method and determining the key parameters of the automatic dredging device for the ultra-deep well; S3: performing the preparation work for the automatic dredging of the ultra-deep well based on the key parameters of the automatic dredging device for the ultra-deep well; S4: performing the automatic dredging operation of the ultra-deep well based on the key parameters of the automatic dredging device for the ultra-deep well; and S5: recovering the automatic dredging device for the ultra-deep well and discharging the standing water. The application can realize the pumping and cleaning of silt with a large depth, is simple to operate, has strong popularization, and can effectively solve the practical problems of the cleaning of silt in an ultra-deep well.

Description

Technical Field

[0001] This invention relates to the field of municipal engineering technology, specifically to an automatic dredging method and system for ultra-deep wells based on the air lift method. Background Technology

[0002] During the process of accumulating and transporting sewage, intercepting wells inevitably retain some silt due to natural sedimentation. Over a long period, a large amount of highly concentrated, viscous silt and gravel, difficult to clean, accumulates at the bottom of the well. If the silt continues to accumulate and reaches a height exceeding that of the drainage pipe, it will prevent domestic sewage from being discharged and may even overflow the well opening, causing severe environmental pollution. Therefore, regular dredging of these wells is both necessary and of great significance.

[0003] Existing sludge treatment methods mainly include sand-dredging, mud pump sludge removal, dual-pump sludge removal, vacuum suction, and air-lift sludge removal. Sand-dredging involves lowering a sand-dredging cylinder to agitate the sludge and then dumping it out of the well. While simple to operate, its effectiveness is generally limited, and it is unsuitable for deep wells with significant sand accumulation, severe sludge buildup, unstable borehole walls due to collapse, or large debris within the well. Mud pump sludge removal uses a high-flow-rate mud pump, spraying clean water through a nozzle. The sludge is flushed to the surface by the upward flow of water, making it suitable for shallow wells with smaller diameters. Dual-pump sludge removal uses one pump to supply water to the bottom of the well to flush away the sludge, while the other pumps water from inside the well to remove the sludge. A high-pressure water gun mixes the sludge with water and extracts it. This method is more effective and efficient for larger diameter and deeper wells, but the large amount of sludge causes significant wear on the pumps and shafts, and can easily burn out the pump motor, resulting in higher maintenance costs. Vacuum suction utilizes the principle of vacuum negative pressure to suck feces and liquid waste into a vehicle-mounted storage container. It is suitable for the suction, transportation, and discharge of sludge, feces, or silt from petrochemical plant wastewater ponds in sewers, rainwater wells, inspection wells, septic tanks, and various ditches. However, its suction capacity is currently limited to 10 meters and it is not suitable for cleaning ultra-deep wells. Air lift dredging involves lowering a steel pipe into the well and inserting an air supply pipe into the outlet pipe. An air compressor delivers compressed air to fully mix the water and air, and under the pressure difference, the water is pushed back to the surface and discharged. When the water depth exceeds 10 meters, it can achieve pumping depths of 100-200 meters.

[0004] Therefore, in order to solve the problem of sludge cleaning in ultra-deep wells, it is both necessary and urgent to design an automatic sludge cleaning method for ultra-deep wells based on the air lift method to achieve the suction and cleaning of sludge and sand mixtures at great depths. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides an automatic dredging method and system for ultra-deep wells based on the gas lift method.

[0006] According to the present invention, an automatic dredging method and system for ultra-deep wells based on gas lift is provided, the scheme of which is as follows:

[0007] Firstly, an automated dredging method for ultra-deep wells based on the gas lift method is provided, the method comprising:

[0008] Step S1: Based on the ultrasonic mud level gauge and ultrasonic water level sensor, determine the silt parameters of the ultra-deep well, namely the distance between the water surface and the bottom of the ultra-deep well and the depth of the silt.

[0009] Step S2: Based on the air lift method, construct an automatic dredging model for ultra-deep wells and determine the key parameters of the automatic dredging device for ultra-deep wells;

[0010] Step S3: Based on the key parameters of the ultra-deep well automatic dredging device, carry out preparation work for the ultra-deep well automatic dredging;

[0011] Step S4: Based on the key parameters of the ultra-deep well automatic dredging device, carry out the ultra-deep well automatic dredging operation;

[0012] Step S5: Retrieve the automatic sludge removal device for the ultra-deep well and discharge the stagnant water.

[0013] Preferably, step S1 includes:

[0014] Step S1.1: Determine the height h1 of the water surface from the wellhead of the ultra-deep well using an ultrasonic water level sensor at the wellhead.

[0015] Step S1.2: Determine the height h2 of the silt from the water surface using an ultrasonic silt level gauge;

[0016] Step S1.3: Based on the ultra-deep well depth H, calculate the distance h between the water surface and the bottom of the ultra-deep well. s and the depth h of the silt y :

[0017]

[0018] Preferably, step S2 includes:

[0019] Step S2.1: Determine the parameters of the sewage discharge steel pipe, including the pipe diameter d. g The number N of sewage discharge steel pipes to be lowered and the lowering depth h of the sewage discharge steel pipes. g ;

[0020] Step S2.2: Determine the gas supply pipe parameters, including the pipe diameter d. q ;

[0021] Among them, the cross-sectional area A of the gas supply pipe is calculated. q :

[0022]

[0023] Among them, v q Indicates the flow rate within the gas supply pipe;

[0024] Step S2.2.2: Based on the cross-sectional area A of the gas supply pipe q Calculate the diameter d of the gas supply pipe. q :

[0025]

[0026] Step S2.3: Determine the air compressor parameters, including the air supply flow rate Q of the air compressor input and discharge steel pipe. g The air pressure p at the input and output drain pipe of the air compressor g The air supply flow rate Q of the air compressor input drain pipe g The calculation formula is:

[0027]

[0028] Where c1 and c2 represent the first correction coefficient and the second correction coefficient, respectively; H r H represents the height difference between the upper inlet of the sewage pipe and the water surface; L ε represents the height difference between the water surface and the lower outlet of the sewage pipe; e represents the magnification factor required to convert the purified water into suction slurry; Q V Indicates the volumetric flow rate using silt;

[0029] The increase factor e required to convert the purified water into suction mud is expressed as follows:

[0030]

[0031] ρ s Indicates the density of water;

[0032] The air pressure p at the input drain pipe of the air compressor g The calculation formula is:

[0033]

[0034] Where Δ represents air pressure compensation;

[0035] Step S2.4: Determine water supply parameters: Based on the hydrostatic equilibrium relationship, determine whether water needs to be injected into the ultra-deep well. If so, calculate the amount of water V to be injected into the ultra-deep well. s .

[0036] Preferably, step S2.1 includes:

[0037] Step S2.1.1: Calculate the pipe diameter d of the sewage discharge steel pipe based on particle dynamics theory and air lift method. g ;

[0038] Based on particle dynamics theory and using Newton's settling formula, the free settling velocity v of solid particles in silt in water is calculated. m :

[0039]

[0040] Where, ρ k ,d k ρ and g represent the density and diameter of the solid particles in the silt, respectively; g represents the density of the silt; g represents the acceleration due to gravity.

[0041] Based on the air lift method, the flow velocity v at the upper outlet of the vertically rising sewage discharge pipe o v should be satisfied o ∈(3v m 4v m );

[0042] Using the volumetric flow rate Q of the silt V Calculate the diameter d of the sewage discharge steel pipe. g :

[0043]

[0044] Step S2.1.2: Based on the ultra-deep well depth H, obtain the number N of sewage discharge steel pipes to be lowered;

[0045] Step S2.1.3: Set the initial height h0 of the bottom of the sewage discharge steel pipe from the upper surface of the sludge, and the depth h of the sludge. y Determine the lowering depth h of the sewage discharge steel pipe. g :

[0046] h g =Hh y -h0.

[0047] Preferably, step S2.4 includes:

[0048] Step S2.4.1: Determine the check height h between the water surface and the silt. L Based on the hydrostatic equilibrium relationship, when the mixture of rising water and sludge in the sewage pipe reaches static equilibrium, the hydrostatic equilibrium equation for the sludge rising process is constructed as follows:

[0049] ρgh L =ρ m gh m

[0050] Where, ρ mh represents the density of the mixture of water and silt rising inside the sewage pipe. m This indicates the height from the upper inlet to the lower outlet of the sewage pipe when the water fluid and the mixed fluid reach static equilibrium.

[0051] Step S2.4.2: Determine whether ultra-deep well water needs to be injected; if h2-h0>h L If so, there is no need to inject ultra-deep well water; otherwise, proceed to step S2.4.3.

[0052] Step S2.4.3: Calculate the volume of water V injected into the ultra-deep well based on the radius R of the ultra-deep well. s :

[0053] V s =πR 2 (h L -h2+h0).

[0054] Preferably, step S3 includes:

[0055] Step S3.1: Move the dredging vehicle frame to the ultra-deep well operation area and fix it in place. Inspect all parts of the ultra-deep well automatic dredging device and open the first air outlet valve of the air compressor.

[0056] Step S3.2: Lower the first sewage discharge steel pipe using an electric winch to a height h, the distance between the upper end of the first sewage discharge steel pipe and the first height h at the wellhead of the ultra-deep well. 01 The first sewage pipe is suspended and clamped by the dredging vehicle frame;

[0057] Step S3.3: Connect the lower end of the (i+1)th sewage pipe to the upper end of the ith sewage pipe, release the suspension clamp of the ith sewage pipe, lower the (i+1)th sewage pipe to the first height from the upper end of the (i+1)th sewage pipe to the wellhead of the ultra-deep well, and then suspend and clamp the (i+1)th sewage pipe via the dredging vehicle frame; where i represents a constant and takes values ​​from 1 to N-1;

[0058] Step S3.4: Repeat step S3.3 until i = N, and open the second air outlet valve of the air compressor;

[0059] Step S3.5: Release the suspension clamp of the Nth sewage pipe, lower the Nth sewage pipe to the initial height h0 of the lower end of the first sewage pipe from the upper surface of the silt, and suspend and clamp the Nth sewage pipe on the dredging vehicle frame.

[0060] Preferably, step S4 includes:

[0061] Step S4.1: Based on the water supply parameters, determine whether it is necessary to inject ultra-deep well water. If so, inject a volume V of water into the ultra-deep well. s ;

[0062] Step S4.2: Start the high-pressure cleaner and rotate the Nth sewage discharge steel pipe of the dredging vehicle frame. The water in the water storage container is used to agitate the sludge under high pressure through the water supply pipe. After the first time t1, turn off the high-pressure cleaner and stop rotating.

[0063] Step S4.3: Start the air compressor, close the air compressor valve, and wait for the air compressor pressure to rise to the air pressure p. g Then, the air compressor valve is opened evenly to draw the mixture of water and sludge into the sludge storage container through the sewage pipe and hose;

[0064] Step S4.4: Every second time interval t2, the Nth sewage discharge steel pipe is horizontally swung by the dredging vehicle frame;

[0065] Step S4.5: After repeating step S44 n times, turn off the air compressor, release the suspension clamp of the Nth sewage pipe, and lower the Nth sewage pipe to the second height h. 02 ;

[0066] Step S4.6: Repeat steps S4.2 to S4.5 until the lower end of the first sewage pipe touches the bottom of the ultra-deep well.

[0067] Secondly, an automatic dredging system for ultra-deep wells based on the air lift method is provided. The system includes: a mobile power supply, a dredging vehicle frame, an electric winch, a high-pressure cleaner, an air compressor, a sludge storage container, a water storage container, a sewage discharge steel pipe, an ultrasonic water level sensor, an ultrasonic mud level gauge, a hose, a water supply pipe, and an air supply pipe.

[0068] The electric winch is installed on the upper part of the dredging vehicle frame, and the mobile power supply provides power to the electric winch; there are N sewage discharge steel pipes, which are connected end to end by quick connectors, and the lifting lug on the side of the first sewage discharge steel pipe is connected to the wire rope of the electric winch by a quick hook.

[0069] The water supply pipe includes two pipes, one of which is connected to a water storage container and a high-pressure cleaner at both ends; the other water supply pipe is connected to a high-pressure cleaner and a first sewage discharge steel pipe at both ends.

[0070] The air supply pipe includes two pipes, one of which is connected to the first sewage discharge steel pipe and the air compressor at both ends; the other air supply pipe is connected to the Nth sewage discharge steel pipe and the air compressor at both ends.

[0071] The two ends of the hose are respectively connected to the Nth sewage discharge steel pipe and the sludge storage container;

[0072] The mud level sensor is installed below the water surface in the ultra-deep well; the ultrasonic water level sensor is installed at the wellhead of the ultra-deep well.

[0073] Preferably, the ultrasonic mud level gauge includes a mud level instrument panel, a connecting rod, and a mud level sensor. The upper end of the connecting rod is connected to the mud level instrument panel via a cable, and the lower end of the connecting rod is fixedly connected to the mud level sensor. The mud level sensor is installed below the water surface of the ultra-deep well.

[0074] Preferably, there are several sludge storage containers and several water storage containers; the lower air inlet of the first sewage discharge steel pipe is provided with several.

[0075] The water supply pipe includes a first water supply pipe and a second water supply pipe. The first end of the first water supply pipe is fixedly connected to the outlet at the lower end of the water storage container, and the second end of the first water supply pipe is fixedly connected to the inlet of the high-pressure cleaner. The first end of the second water supply pipe is fixedly connected to the outlet of the high-pressure cleaner, and the second end of the second water supply pipe is fixedly connected to the lower end of the first sewage discharge steel pipe.

[0076] The second end of the second water supply pipe is provided with three branch water pipes that are evenly distributed around the circumference, and each branch water pipe is provided with a jet nozzle at its lower end.

[0077] Compared with the prior art, the present invention has the following beneficial effects:

[0078] 1. The method provided by this invention demonstrates the theoretical possibility of extracting sludge from ultra-deep wells by constructing a hydrostatic equilibrium equation for the sludge rising process; based on particle dynamics theory and with the help of Newton's sedimentation formula, the upward flow velocity of the mixture of sludge and water under the critical state in which sludge can be hydraulically lifted is obtained, and then the required steel pipe diameter and the pressure required by the air compressor are obtained, proving the feasibility of extracting sludge from ultra-deep wells by air lift method.

[0079] 2. The system provided by this invention uses a high-pressure cleaner to form a water jet to agitate the sludge and an air compressor to create a strong pressure difference to provide the power for the mud and water to rise. It can achieve the suction and cleaning of sludge and sand mixtures at great depths. The modular design, simple operation, and strong scalability can effectively solve the practical problem of sludge cleaning in ultra-deep wells and have important practical application value.

[0080] Other beneficial effects of the present invention will be explained in detail through the introduction of specific technical features and technical solutions in specific embodiments. Those skilled in the art should be able to understand the beneficial technical effects brought about by these technical features and technical solutions through the introduction of these technical features and technical solutions. Attached Figure Description

[0081] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0082] Figure 1This is a flowchart of the automatic dredging method for ultra-deep wells based on the gas lift method of the present invention;

[0083] Figure 2 This is a schematic diagram of the hydrostatic model of the present invention;

[0084] Figure 3 This is a diagram showing the composition of the automatic dredging device for ultra-deep wells according to the present invention. Detailed Implementation

[0085] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the scope of protection of the present invention.

[0086] This invention provides an automated sludge removal method for ultra-deep wells based on the air lift method. The method includes: determining sludge parameters in the ultra-deep well; constructing an automated sludge removal model for the ultra-deep well based on the air lift method, and determining key parameters of the automated sludge removal device; preparing for automated sludge removal based on the key parameters of the automated sludge removal device; performing automated sludge removal operations based on the key parameters of the automated sludge removal device; and recovering and discharging stagnant water using the automated sludge removal device. Based on this, an automated sludge removal device for ultra-deep wells is proposed. This invention, by constructing the hydrostatic equilibrium equation for the sludge rising process and based on particle dynamics theory, obtains the key parameters of the automated sludge removal device for ultra-deep wells. It can realize the suction and cleaning of sludge at great depths, is simple to operate, has strong scalability, and can effectively solve the practical problem of sludge cleaning in ultra-deep wells.

[0087] Reference Figure 1 As shown, the method specifically includes the following:

[0088] Step S1: Determine the sludge parameters of the ultra-deep well: Based on the ultrasonic sludge level gauge and ultrasonic water level sensor, determine the distance h between the water surface and the bottom of the ultra-deep well. s and the depth h of the silt y ;

[0089] This step specifically includes: Step S1.1: Using an ultrasonic water level sensor at the wellhead of the ultra-deep well, determine the height h1 of the water surface from the wellhead of the ultra-deep well;

[0090] Step S1.2: Determine the height h2 of the silt from the water surface using an ultrasonic silt level gauge;

[0091] Step S1.3: Based on the ultra-deep well depth H, calculate the distance h between the water surface and the bottom of the ultra-deep well. s and the depth h of the silt y :

[0092]

[0093] Step S2: Based on the air lift method, construct an automatic dredging model for ultra-deep wells and determine the key parameters of the automatic dredging device for ultra-deep wells; the key parameters of the automatic dredging device for ultra-deep wells include the parameters of the sewage discharge steel pipe, the air supply pipe, the air compressor, and the water supply.

[0094] This step specifically includes: Step S2.1: Determine the parameters of the sewage discharge steel pipe, including the pipe diameter d. g The number N of sewage discharge steel pipes to be lowered and the lowering depth h of the sewage discharge steel pipes. g ;

[0095] Step S2.1 includes:

[0096] Step S2.1.1: Calculate the pipe diameter d of the sewage discharge steel pipe based on particle dynamics theory and air lift method. g ;

[0097] Based on particle dynamics theory and using Newton's settling formula, the free settling velocity v of solid particles in silt in water is calculated. m :

[0098]

[0099] Where, ρ k ,d k ρ and g represent the density and diameter of the solid particles in the silt, respectively; g represents the density of the silt; g represents the acceleration due to gravity.

[0100] Based on the air lift method, the flow velocity v at the upper outlet of the vertically rising sewage discharge pipe o v should be satisfied o ∈(3v m 4v m );

[0101] Using the volumetric flow rate Q of the silt V Calculate the diameter d of the sewage discharge steel pipe. g :

[0102]

[0103] Step S2.1.2: Based on the ultra-deep well depth H, obtain the number N of sewage discharge steel pipes to be lowered;

[0104] Step S2.1.3: Set the initial height h0 of the bottom of the sewage discharge steel pipe from the upper surface of the sludge, and the depth h of the sludge. y Determine the lowering depth h of the sewage discharge steel pipe. g :

[0105] h g=Hh y -h0.

[0106] Step S2.2: Determine the gas supply pipe parameters, including the pipe diameter d. q ;

[0107] Among them, the cross-sectional area A of the gas supply pipe is calculated. q :

[0108]

[0109] Among them, v q Indicates the flow rate within the gas supply pipe;

[0110] Step S2.2.2: Based on the cross-sectional area A of the gas supply pipe q Calculate the diameter d of the gas supply pipe. q :

[0111]

[0112] Step S2.3: Determine the air compressor parameters, including the air supply flow rate Q of the air compressor input and discharge steel pipes. g The air pressure p at the input and output drain pipe of the air compressor g Air supply flow rate Q of the air compressor input drain pipe g The calculation formula is:

[0113]

[0114] Where c1 and c2 represent the first correction coefficient and the second correction coefficient, respectively; H r H represents the height difference between the upper inlet of the sewage pipe and the water surface; L ε represents the height difference between the water surface and the lower outlet of the sewage pipe; e represents the magnification factor required to convert the purified water into suction slurry; Q V Indicates the volumetric flow rate using silt;

[0115] The increase factor e required to convert the purified water into suction mud is expressed as follows:

[0116]

[0117] ρ s Indicates the density of water;

[0118] The air pressure p at the inlet and outlet steel pipe of the air compressor g The calculation formula is:

[0119]

[0120] Where Δ represents air pressure compensation;

[0121] Step S2.4: Determine water supply parameters: Based on the hydrostatic equilibrium relationship, determine whether water needs to be injected into the ultra-deep well. If so, calculate the amount of water V to be injected into the ultra-deep well. s .

[0122] Step S2.4 includes:

[0123] Step S2.4.1: Determine the check height h between the water surface and the silt. L Based on the hydrostatic equilibrium relationship, when the mixture of rising water and sludge in the sewage pipe reaches static equilibrium, the hydrostatic equilibrium equation for the sludge rising process is constructed as follows:

[0124] ρgh L =ρ m gh m

[0125] Where, ρ m h represents the density of the mixture of water and silt rising inside the sewage pipe. m This indicates the height from the upper inlet to the lower outlet of the sewage pipe when the water fluid and the mixed fluid reach static equilibrium.

[0126] Step S2.4.2: Determine whether ultra-deep well water needs to be injected; if h2-h0>h L If so, there is no need to inject ultra-deep well water; otherwise, proceed to step S2.4.3.

[0127] Step S2.4.3: Calculate the volume of water V injected into the ultra-deep well based on the radius R of the ultra-deep well. s :

[0128] V s =πR 2 (h L -h2+h0).

[0129] Step S3: Based on the key parameters of the ultra-deep well automatic dredging device, carry out preparation work for the ultra-deep well automatic dredging.

[0130] Step S3 specifically includes:

[0131] Step S3.1: Move the dredging vehicle frame to the ultra-deep well operation area and fix it in place. Inspect all parts of the ultra-deep well automatic dredging device and open the first air outlet valve of the air compressor.

[0132] Step S3.2: Lower the first sewage discharge steel pipe using an electric winch to a height h, the distance between the upper end of the first sewage discharge steel pipe and the first height h at the wellhead of the ultra-deep well. 01 The first sewage pipe is suspended and clamped by the dredging vehicle frame;

[0133] Step S3.3: Connect the lower end of the (i+1)th sewage pipe to the upper end of the ith sewage pipe, release the suspension clamp of the ith sewage pipe, lower the (i+1)th sewage pipe to the first height from the upper end of the (i+1)th sewage pipe to the wellhead of the ultra-deep well, and then suspend and clamp the (i+1)th sewage pipe via the dredging vehicle frame; where i represents a constant and takes values ​​from 1 to N-1;

[0134] Step S3.4: Repeat step S3.3 until i = N, and open the second air outlet valve of the air compressor;

[0135] Step S3.5: Release the suspension clamp of the Nth sewage pipe, lower the Nth sewage pipe to the initial height h0 of the lower end of the first sewage pipe from the upper surface of the silt, and suspend and clamp the Nth sewage pipe on the dredging vehicle frame.

[0136] Step S4: Based on the key parameters of the ultra-deep well automatic dredging device, carry out the ultra-deep well automatic dredging operation.

[0137] Step S4 specifically includes:

[0138] Step S4.1: Based on the water supply parameters, determine whether it is necessary to inject ultra-deep well water. If so, inject a volume V of water into the ultra-deep well. s ;

[0139] Step S4.2: Start the high-pressure cleaner and rotate the Nth sewage discharge steel pipe of the dredging vehicle frame. The water in the water storage container is used to agitate the sludge under high pressure through the water supply pipe. After the first time t1, turn off the high-pressure cleaner and stop rotating.

[0140] Step S4.3: Start the air compressor, close the air compressor valve, and wait for the air compressor pressure to rise to the air pressure p. g Then, the air compressor valve is opened evenly to draw the mixture of water and sludge into the sludge storage container through the sewage pipe and hose;

[0141] Step S4.4: Every second time interval t2, the Nth sewage discharge steel pipe is horizontally swung by the dredging vehicle frame;

[0142] Step S4.5: After repeating step S44 n times, turn off the air compressor, release the suspension clamp of the Nth sewage pipe, and lower the Nth sewage pipe to the second height h. 02 ;

[0143] Step S4.6: Repeat steps S4.2 to S4.5 until the lower end of the first sewage pipe touches the bottom of the ultra-deep well.

[0144] Step S5: Recovering and discharging stagnant water using the automatic sludge removal device for ultra-deep wells: The sewage discharge steel pipe is raised by the electric winch of the sludge removal vehicle frame, and all sewage discharge steel pipes, water supply pipes and air supply pipes are recovered; the stagnant clean water in the sludge storage container is filtered through the drainage filter in the middle of the sludge storage container and then discharged into the ultra-deep well.

[0145] This invention also provides an automatic dredging system for ultra-deep wells based on the air lift method. The system specifically includes: a mobile power supply, a dredging vehicle frame, an electric winch, a high-pressure washer, an air compressor, a sludge storage container, a water storage container, a sewage discharge steel pipe, an ultrasonic water level sensor, an ultrasonic mud level gauge, a hose, a water supply pipe, and an air supply pipe. The electric winch is installed on the upper part of the dredging vehicle frame, and the mobile power supply provides power to the electric winch. There are N sewage discharge steel pipes, which are connected end to end by quick couplings. The lifting lug on the side of the first sewage discharge steel pipe is connected to the wire rope of the electric winch via a quick hook.

[0146] The water supply pipe includes a first water supply pipe and a second water supply pipe. The first end of the first water supply pipe is fixedly connected to the outlet at the bottom of the water storage container, and the second end of the first water supply pipe is fixedly connected to the inlet of the high-pressure cleaner. The first end of the second water supply pipe is fixedly connected to the outlet of the high-pressure cleaner, and the second end of the second water supply pipe is fixedly connected to the bottom of the first sewage discharge steel pipe.

[0147] The air supply pipe includes a first air supply pipe and a second air supply pipe. The first end of the first air supply pipe is fixedly connected to the lower air inlet of the first sewage discharge steel pipe, and the second end of the first air supply pipe is fixedly connected to the first air outlet of the air compressor. The first end of the second air supply pipe is fixedly connected to the upper second air inlet of the Nth sewage discharge steel pipe, and the second end of the second air supply pipe is fixedly connected to the second air outlet of the air compressor.

[0148] The first end of the hose is fixedly connected to the upper end of the Nth sewage discharge steel pipe, and the second end of the hose is fixedly connected to the upper end of the sludge storage container; the ultrasonic sludge level gauge includes a sludge level instrument panel, a connecting rod, and a sludge level sensor. The upper end of the connecting rod is connected to the sludge level instrument panel via a cable, and the lower end of the connecting rod is fixedly connected to the sludge level sensor; the sludge level sensor is installed below the water surface of the ultra-deep well; the ultrasonic water level sensor is installed at the wellhead of the ultra-deep well.

[0149] Several sludge storage containers and several water storage containers are provided; several air inlets are provided at the lower part of the first sewage discharge steel pipe; three branch water pipes are provided at the second end of the second water supply pipe, evenly distributed around the circumference, and each branch water pipe is equipped with a jet nozzle at its lower end. The high-pressure cleaner and air compressor are both powered by diesel fuel.

[0150] The present invention will now be described in more detail.

[0151] This invention provides an automated sludge removal method for ultra-deep wells based on the gas lift method, referring to... Figure 1 As shown, it specifically includes:

[0152] S1. Determine the silt parameters of the ultra-deep well: Based on the ultrasonic silt level gauge and ultrasonic water level sensor, determine the distance h between the water surface and the bottom of the ultra-deep well. s and the depth h of the silt y .

[0153] S11. Using an ultrasonic water level sensor at the wellhead of the ultra-deep well, determine the height h1 of the water surface from the wellhead of the ultra-deep well.

[0154] S12. Use an ultrasonic mud level gauge to determine the height h2 of the silt above the water surface.

[0155] S13. Based on the depth H of the ultra-deep well, calculate the distance h between the water surface and the bottom of the ultra-deep well. s and the depth h of the silt y :

[0156]

[0157] In one specific embodiment, the depth H of the ultra-deep well is taken as 10m.

[0158] S2. Based on the air lift method, construct an automatic dredging model for ultra-deep wells and determine the key parameters of the automatic dredging device for ultra-deep wells. The key parameters of the automatic dredging device for ultra-deep wells include the parameters of the sewage discharge steel pipe, the air supply pipe, the air compressor, and the water supply.

[0159] S21. Determine the parameters of the sewage discharge steel pipe, including the pipe diameter d. g The number N of sewage discharge steel pipes to be lowered and the lowering depth h of the sewage discharge steel pipes. g .

[0160] S211. Based on particle dynamics theory and air lift method, calculate the pipe diameter d of the sewage discharge steel pipe. g .

[0161] S2111. Based on particle dynamics theory and using Newton's settling formula, calculate the free settling velocity v of solid particles in silt in water. m :

[0162]

[0163] Where, ρ k ,d k Let ρ and g represent the density and diameter of the solid particles in the silt, respectively; ρ represents the density of the silt; and g represents the acceleration due to gravity. The free settling velocity of the particles is v. m This represents the falling speed of a solid particle in water when the forces of gravity, buoyancy, and resistance are in equilibrium. Conversely, when the upward flow velocity of the fluid exceeds this value, the solid particle will be in a critical state where it can be lifted by hydraulic force.

[0164] S2112. Based on the suggestion of Soviet scholar Spivakovsky, and using the air lift method, the outlet velocity v at the upper end of the vertically rising sewage discharge pipe... o v should be satisfied o ∈(3v m 4v m ).

[0165] S2113, using the volumetric flow rate Q of silt V Calculate the diameter d of the sewage discharge steel pipe. g :

[0166]

[0167] In one specific embodiment, after consulting relevant materials, the density of the silt was initially estimated to be the density ρ of water. s 1.25 times, that is, ρ = 1.25ρ s The diameter d of solid particles in silt k =5mm, density is comparable to that of sand and gravel, i.e., ρ k =2.5ρ s The volumetric flow rate Q of the extracted mud V =0.4m 3 / min. Based on the above data, estimate the diameter range d of the sewage discharge steel pipe. g ∈(0.074,0.086)m, take the inner diameter as 81mm.

[0168] S212. Based on the ultra-deep well depth H, obtain the number N of sewage discharge steel pipes to be lowered.

[0169] S213. Set the initial height h0 between the bottom of the sewage discharge steel pipe and the upper surface of the silt, and determine the lowering depth h of the sewage discharge steel pipe. g :

[0170] h g =Hh y -h0

[0171] S22. Determine the gas supply pipe parameters, including the pipe diameter d. q .

[0172] S221. Calculate the cross-sectional area A of the gas supply pipe. q :

[0173]

[0174] Among them, v q This indicates the flow rate within the gas supply pipe.

[0175] S222, Based on the cross-sectional area A of the gas supply pipe q Calculate the diameter d of the gas supply pipe. q :

[0176]

[0177] S23. Determine the air compressor parameters, including the air supply flow rate Q of the air compressor's input and discharge steel pipes. g The air pressure p at the input and output drain pipe of the air compressor g Air supply flow rate Q of the air compressor input drain pipe g The calculation formula is:

[0178]

[0179] Where c1 and c2 represent the first correction factor and the second correction factor, respectively, with c1 typically ranging from 1.5 to 2.0 and c2 typically taking the value of 0.5; H r H represents the height difference between the upper inlet of the sewage pipe and the water surface; L ε represents the height difference between the water surface and the lower outlet of the sewage pipe; e represents the magnification factor required to convert the purified water into suction slurry; Q V This indicates the volumetric flow rate using silt.

[0180] The increase factor e required to convert the purified water into suction mud is expressed as:

[0181]

[0182] Where, ρ s This indicates the density of water.

[0183] The air pressure p at the inlet and outlet steel pipe of the air compressor g The calculation formula is:

[0184]

[0185] Where Δ represents air pressure compensation.

[0186] In one specific embodiment, ρ m =0.4ρ=0.5ρ s H r Take 5m, H L If we take 3m, then the air supply flow rate Q of the air compressor input drain pipe is... g Approximately 0.71m 3 / min. H L Assuming a maximum well depth of 10m and an air pressure compensation Δ of 0.02~0.05MPa, the air pressure p input to the sewage discharge pipe of the air compressor is... g The pressure is 0.12–0.15 MPa. Ultimately, the air compressor's ventilation rate is set at 2.8 m³ / s. 3 / min, working pressure is 0.5MPa.

[0187] S24. Determine water supply parameters: Based on the hydrostatic equilibrium relationship, determine whether water needs to be injected into the ultra-deep well. If so, calculate the volume of water V to be injected into the ultra-deep well. s .

[0188] S241. Determine the check height h between the water surface and the silt. L Fluid statics model such as Figure 2 As shown, based on the hydrostatic equilibrium relationship, when the mixture of rising water and sludge in the sewage pipe reaches static equilibrium, the hydrostatic equilibrium equation for the sludge rising process is constructed:

[0189] ρgh L =ρ m gh m

[0190] Where, ρ m h represents the density of the mixture of water and silt rising inside the sewage pipe. m This indicates the height from the upper inlet to the lower outlet of the sewage pipe when the water fluid and the mixed fluid reach static equilibrium.

[0191] In one specific embodiment, h L =3m,ρ m / ρ≤0.35, at this time h m It can reach 8.57m.

[0192] S242. Determine whether ultra-deep well water injection is necessary; if h2-h0>h L If the water level is within the specified range, then there is no need to inject ultra-deep well water; otherwise, proceed to step S243.

[0193] S243. Based on the radius R of the ultra-deep well, calculate the volume V of water injected into the ultra-deep well. s :

[0194] V s =πR 2 (h L -h2+h0)

[0195] S3. Based on the key parameters of the ultra-deep well automatic dredging device, carry out preparation work for the ultra-deep well automatic dredging.

[0196] S31. Move the dredging vehicle frame to the ultra-deep well operation area and fix it in place. Inspect all parts of the ultra-deep well automatic dredging device and open the first air outlet valve of the air compressor.

[0197] S32. The first sewage discharge steel pipe is lowered by an electric winch to the first height h of the distance between the upper end of the first sewage discharge steel pipe and the wellhead of the ultra-deep well. 01 The first sewage pipe was suspended and clamped by the dredging vehicle frame.

[0198] S33. Connect the lower end of the (i+1)th sewage pipe to the upper end of the ith sewage pipe, release the suspension clamp of the ith sewage pipe, lower the (i+1)th sewage pipe to the first height from the upper end of the (i+1)th sewage pipe to the wellhead of the ultra-deep well, and then suspend and clamp the (i+1)th sewage pipe through the dredging vehicle frame; where i represents a constant and takes values ​​from 1 to N-1.

[0199] S34. Repeat step S33 until i = N, and open the second air outlet valve of the air compressor.

[0200] S35. Release the suspension clamp of the Nth sewage pipe, lower the Nth sewage pipe to the initial height h0 of the lower end of the 1st sewage pipe from the upper surface of the silt, and suspend and clamp the Nth sewage pipe on the dredging vehicle frame.

[0201] S4. Based on the key parameters of the ultra-deep well automatic dredging device, carry out ultra-deep well automatic dredging operations.

[0202] S41. Based on the water supply parameters, determine whether it is necessary to inject ultra-deep well water. If so, inject the amount of water V into the ultra-deep well. s .

[0203] S42. Start the high-pressure cleaner and rotate the Nth sewage pipe of the dredging vehicle frame. The water in the water storage container is used to agitate the sludge under high pressure through the water supply pipe. After the first time t1, turn off the high-pressure cleaner and stop rotating.

[0204] S43. Start the air compressor, close the air compressor valve, and wait for the air compressor pressure to rise to the air pressure p. g Then, the air compressor valve is opened evenly, and the mixture of water and sludge is sucked into the sludge storage container through the sewage pipe and hose.

[0205] S44. Every second time interval t2, the Nth sewage pipe is horizontally swung by the dredging vehicle frame.

[0206] S45. After repeating step S44 n times, turn off the air compressor, release the suspension clamp of the Nth sewage pipe, and lower the Nth sewage pipe to the second height h. 02 .

[0207] S46. Repeat steps S42 to S45 until the lower end of the first sewage pipe touches the bottom of the ultra-deep well.

[0208] S5. Automatic sludge removal device for ultra-deep wells: The electric winch of the sludge removal vehicle lifts the sewage discharge steel pipe, and recovers all sewage discharge steel pipes, water supply pipes and air supply pipes; the clear water that has been left to stand in the sludge storage container is filtered through the drainage filter in the middle of the sludge storage container and then discharged into the ultra-deep well.

[0209] Another aspect of the present invention provides an automated sludge removal system for ultra-deep wells based on the gas lift method, such as... Figure 3 As shown, it includes a mobile power supply, a dredging vehicle frame, an electric winch, a high-pressure cleaner, an air compressor, a sludge storage container, a water storage container, a sewage discharge steel pipe, an ultrasonic water level sensor, an ultrasonic mud level gauge, a hose, a water supply pipe, and an air supply pipe.

[0210] The electric winch is mounted on the upper part of the dredging vehicle frame, and a mobile power supply provides power to the electric winch. In one specific embodiment, the electric winch has a rated lifting capacity of 400 kg, a rated voltage of 220 V, and a motor power of 1 kW; the mobile power supply has a rated power of 1.5 kW, a rated voltage of 220 V, and a nominal capacity of 1598 WH.

[0211] Both the high-pressure washer and the air compressor are powered by diesel fuel. In one specific embodiment, the high-pressure washer has a horsepower of 27, a pressure of 20 MPa, and a flow rate of 60 L / min; the air compressor has an air throughput of 2.8 m³ / min. 3 The air pressure is 0.5 MPa, and the outlet is 6-point.

[0212] Several empty sludge storage containers and several water storage containers are provided. In one specific embodiment, there is one sludge storage container and two water storage containers, each with a volume of 1.5 m³. 3 .

[0213] There are N sewage discharge steel pipes, each connected end-to-end via quick-connect couplings. The lifting lug on the side of the first sewage discharge steel pipe is connected to the wire rope of the electric winch via a quick-connect hook. The lower part of the first sewage discharge steel pipe has several air inlets. In one specific embodiment, N is 5, and the sewage discharge steel pipes have an inner diameter of 81mm, an outer diameter of 89mm, and a length of 2m, and are connected to each other by threads.

[0214] The water supply system includes a first water supply pipe and a second water supply pipe. The first end of the first water supply pipe is fixedly connected to the outlet at the lower end of the water storage container, and the second end is fixedly connected to the inlet of the high-pressure washer. The first end of the second water supply pipe is fixedly connected to the outlet of the high-pressure washer, and the second end is fixedly connected to the lower end of the first sewage discharge pipe. The second end of the second water supply pipe has three branch pipes evenly distributed around its circumference, and each branch pipe has a jet nozzle at its lower end. In one specific embodiment, the first water supply pipe is selected as a 6-point diameter pipe with a length of 10 meters, the second water supply pipe is selected as a 4-point diameter high-pressure water pipe with a length of 30 meters, the branch pipes are selected as 4-point diameter high-pressure water pipes with a length of 1 meter, and the jet nozzle has four holes with a diameter of 3 mm.

[0215] The air supply pipe includes a first air supply pipe and a second air supply pipe. The first end of the first air supply pipe is fixedly connected to the lower air inlet of the first sewage discharge steel pipe, and the second end of the first air supply pipe is fixedly connected to the first air outlet of the air compressor. The first end of the second air supply pipe is fixedly connected to the upper second air inlet of the Nth sewage discharge steel pipe, and the second end of the second air supply pipe is fixedly connected to the second air outlet of the air compressor. In a specific embodiment, both the first and second air supply pipes are selected as 6-point diameter pipes with lengths of 15m and 30m, respectively.

[0216] The first end of the hose is fixedly connected to the upper end of the Nth sewage pipe, and the second end of the hose is fixedly connected to the upper end of the sludge storage container. In one specific embodiment, the hose has a diameter of 3 inches and a length of 5 meters.

[0217] The ultrasonic mud level gauge includes a mud level instrument panel, a connecting rod, and a mud level sensor. The upper end of the connecting rod is connected to the mud level instrument panel via a cable, and the lower end of the connecting rod is fixedly connected to the mud level sensor. The mud level sensor is installed below the water surface in the ultra-deep well; the ultrasonic water level sensor is installed at the wellhead of the ultra-deep well. In one specific embodiment, the connecting rod is made of four 1.5m long, 1-inch thick plastic pipes, threaded together. The mud level sensor has a measurement range of 0.4–25m and a resolution of 0.01m.

[0218] This invention provides an automatic sludge removal method and system for ultra-deep wells based on air lift. By constructing the hydrostatic equilibrium equation for the sludge rising process, the theoretical possibility of extracting sludge from ultra-deep wells using air lift is demonstrated. Based on particle dynamics theory and using Newton's sedimentation formula, the upward flow velocity of the sludge-water mixture under the critical state where sludge can be hydraulically lifted is obtained, thereby determining the required steel pipe diameter and the pressure required by the air compressor, proving the feasibility of extracting sludge from ultra-deep wells using air lift. The designed automatic sludge removal device for ultra-deep wells uses a high-pressure washer to form a water jet to agitate the sludge and an air compressor to create a strong pressure difference to provide the power for the mud-water rise. It can achieve the suction and cleaning of sludge and sand mixtures at great depths. The modular design, simple operation, and strong scalability can effectively solve the practical problem of sludge cleaning in ultra-deep wells and have significant practical application value.

[0219] Those skilled in the art will understand that, besides implementing the system and its various devices, modules, and units provided by this invention in the form of purely computer-readable program code, the same functions can be achieved entirely through logical programming of the method steps, making the system and its various devices, modules, and units of this invention function in the form of logic gates, switches, application-specific integrated circuits, programmable logic controllers, and embedded microcontrollers. Therefore, the system and its various devices, modules, and units provided by this invention can be considered as a hardware component, and the devices, modules, and units included therein for implementing various functions can also be considered as structures within the hardware component; alternatively, the devices, modules, and units for implementing various functions can be considered as both software modules implementing the method and structures within the hardware component.

[0220] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0221] Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A method for automatic dredging of ultra-deep wells based on the gas lift method, characterized by, include: Step S1: Based on the ultrasonic mud level gauge and ultrasonic water level sensor, determine the silt parameters of the ultra-deep well, namely the distance between the water surface and the bottom of the ultra-deep well and the depth of the silt. Step S2: Based on the air lift method, construct an automatic dredging model for ultra-deep wells and determine the key parameters of the automatic dredging device for ultra-deep wells; Step S3: Based on the key parameters of the ultra-deep well automatic dredging device, carry out preparation work for the ultra-deep well automatic dredging; Step S4: Based on the key parameters of the ultra-deep well automatic dredging device, carry out the ultra-deep well automatic dredging operation; Step S5: Retrieve the automatic sludge removal device for the ultra-deep well and discharge the stagnant water; Step S2 includes: Step S2.1 : determining the outfall pipe parameters, including the pipe diameter of the outfall pipe d g , the number of drops of the outfall pipe N and the drop depth of the outfall pipe h g ; Step S2.2: determining gas supply pipe parameters, including pipe diameter of the gas supply pipe ; wherein the cross-sectional area of the air supply pipe is calculated : wherein represents the flow rate within the gas supply tube; Step S2.2.2: Calculate the pipe diameter of the gas supply pipe based on the cross-sectional area of the gas supply pipe :​ ； Step S2.3: determining air compressor parameters, including air compressor input blowdown pipe air supply flow rate and air compressor input blowdown pipe air pressure ; the calculation formula of the air compressor input blowdown pipe air supply flow rate is: in, These represent the first correction factor and the second correction factor, respectively. This indicates the height difference between the upper inlet of the sewage pipe and the water surface; This indicates the height difference between the water surface and the lower outlet of the sewage pipe; e This indicates the scaling factor required to convert the purified water into suction mud. Indicates the volumetric flow rate using silt; Wherein, the suction and lifting clean water is converted into the increase coefficient required for suction and lifting mud e is represented as: denotes the density of water; The air pressure inputted into the air exhaust steel pipe of the air compressor The calculation formula is: wherein represents air pressure compensation; Step S2.4: determining water supply parameters: judging whether water needs to be injected into the ultra-deep well through the hydrostatic equilibrium relationship, and if so, calculating the amount of water injected into the ultra-deep well ; Step S2.1 includes: Step S2.1.1: Calculate the pipe diameter of the blowdown steel pipe based on the particle dynamics theory and the gas lift method d g ; Based on the theory of granular kinetics, the free settling velocity of solid particles in water is calculated by means of Newton's sedimentation formula v m : wherein, respectively denote the density of the solid particles in the sludge and the diameter of the contained particles; denotes the density of the sludge; denotes the acceleration of gravity; Based on the gas lift method, the flow rate of the upper end outlet of the vertically ascending blowdown steel pipe Should satisfy ; By means of the volume flow of the sludge , the pipe diameter of the sewer pipe is calculated d g : ； Step S2.1.2: obtaining the number of drop-offs of the sewer steel pipe based on the depth of the ultra-deep well H N ;​ Step S2.1.3: Set the initial height of the bottom of the sewer pipe from the upper surface of the sludge h 0, the depth of the sludge h y , determine the depth of the sewer pipe h g : ； Step S2.4 includes: Step S2.4.1 : Determine the check height of the water surface from the sludge h L : Based on the hydrostatic equilibrium relationship, when the mixture of the water and sludge rising in the sewage steel pipe reaches static equilibrium, the hydrostatic equilibrium equation of the sludge rising process is constructed: wherein, represents the density of the mixture of water and sludge rising in the sewer pipe; represents the height from the inlet of the upper end of the sewer pipe to the outlet of the lower end of the sewer pipe when the water fluid and the mixture fluid reach static equilibrium. Step S2.4.2: Determine whether ultra-deep well water needs to be injected; if the conditions are met... If so, there is no need to inject ultra-deep well water; otherwise, proceed to step S2.4.

3. Step S2.4.3: calculating the water volume injected into the ultra-deep well based on the radius of the ultra-deep well R , calculating the water volume injected into the ultra-deep well : 。 2. The automatic dewatering method of ultra-deep well based on gas lift method according to claim 1, characterized in that, Step S1 includes: Step S1.1: Determine the height of the water surface from the wellhead of the ultra-deep well by means of an ultrasonic water level sensor of the wellhead h 1; Step S1.2: Determine the height of the sludge from the water surface by means of an ultrasonic sludge level meter h 2; Step S1.3: Calculate the water surface distance from the ultra-deep well bottom based on the ultra-deep well depth H h s and the depth of the silt h y :​ 。 3. The automatic dewatering method of ultra-deep well based on gas lift method according to claim 1, characterized in that, Step S3 includes: Step S3.1: Move the dredging vehicle frame to the ultra-deep well operation area and fix it in place. Inspect all parts of the ultra-deep well automatic dredging device and open the first air outlet valve of the air compressor. Step S3.2: Lower the first drain steel pipe to the first height from the wellhead by the electric hoist h 01 , the first drain steel pipe is suspended and clamped by the dredging frame; Step S3.3: Place the first i +1 The lower end of the sewage pipe is connected to the first i At the upper end of the sewage pipe, disconnect the first i The suspension clamp of the sewage pipe is lowered. i +1 sewage pipe to the first i +1 The upper end of the sewage discharge steel pipe is at the first height from the wellhead of the ultra-deep well, and is suspended and clamped by the dredging vehicle frame. i +1 sewage pipe; among which... i Denotes a constant and takes values ​​from 1 to... N -1; Step S3.4: repeatedly performing step S3.3 to i=N opening the second air outlet valve of the air compressor; Step S3.5: release the suspended grip of the first N suspended grip of the first N suspended grip of the first h 0, the dredging carriage suspends the first N suspended grip of the first 4. The automatic dewatering method of ultra-deep well based on gas lift method according to claim 1, characterized in that, Step S4 includes: Step S4.1: Based on the water supply parameters, determine whether to inject water into the ultra-deep well, and if so, inject the amount of water into the ultra-deep well ; Step S4.2: Start the high-pressure cleaner and rotate the dredging frame for a first time N Root sewage pipe, water storage container in the water through the water supply pipe high pressure stirring sludge, lasting first time t 1After closing the high-pressure cleaner and stop rotating; Step S4.3: Start the air compressor, close the air compressor valve, and wait for the air compressor pressure to rise to the required air pressure. Then, the air compressor valve is opened evenly to draw the mixture of water and sludge into the sludge storage container through the sewage pipe and hose; Step S4.4: every second time t 2, the dredging frame horizontal swing N Root sewage steel pipe; Step S4.5: Repeatedly performing n After the sub-step S44, the air compressor is closed, the first N The suspension clamping of the sewage steel pipe is released, and the first N The second height of the sewage steel pipe h 02 ; Step S4.6: Repeat steps S4.2 to S4.5 until the lower end of the first sewage pipe touches the bottom of the ultra-deep well.

5. An automatic dewatering system for ultra-deep wells based on the gas lift method, according to any one of claims 1 to 4, characterized in that, include: Portable power supply, dredging vehicle frame, electric winch, high-pressure cleaner, air compressor, sludge storage container, water storage container, sewage discharge steel pipe, ultrasonic water level sensor, ultrasonic mud level gauge, hose, water supply pipe and air supply pipe. The ultrasonic mud level gauge includes a mud level instrument panel, a connecting rod, and a mud level sensor. The upper end of the connecting rod is connected to the mud level instrument panel via a cable, and the lower end of the connecting rod is fixedly connected to the mud level sensor. The mud level sensor is installed below the water surface of the ultra-deep well. The electric hoist is installed on the upper part of the dredging frame, and the mobile power supply supplies electric power for the electric hoist; the sewage steel pipe is provided with N one and is connected in head-to-tail mode through quick connectors, and the lifting lug on the side of the first sewage steel pipe is connected with the steel wire rope of the electric hoist through a quick connector hook. The water supply pipe includes two pipes, one of which is connected to a water storage container and a high-pressure cleaner at both ends; the other water supply pipe is connected to a high-pressure cleaner and a first sewage discharge steel pipe at both ends. The air supply pipes include two, one end of one air supply pipe is connected with the first blowdown steel pipe and the air compressor, and the other end of the other air supply pipe is connected with the other blowdown steel pipe and the air compressor. N The air supply pipes include two, one end of one air supply pipe is connected with the first blowdown steel pipe and the air compressor, and the other end of the other air supply pipe is connected with the other blowdown steel pipe and the air compressor. The two ends of the hose are respectively connected to the first N Root drain steel pipe and silt storage container; The mud level sensor is installed below the water surface in the ultra-deep well; the ultrasonic water level sensor is installed at the wellhead of the ultra-deep well.

6. The automatic gas lift method based deep well cleaning system according to claim 5, characterized in that, The sludge storage container and water storage container are each provided in several units; the lower air inlet of the first sewage discharge steel pipe is provided in several units; The water supply pipe includes a first water supply pipe and a second water supply pipe. The first end of the first water supply pipe is fixedly connected to the outlet at the lower end of the water storage container, and the second end of the first water supply pipe is fixedly connected to the inlet of the high-pressure cleaner. The first end of the second water supply pipe is fixedly connected to the outlet of the high-pressure cleaner, and the second end of the second water supply pipe is fixedly connected to the lower end of the first sewage discharge steel pipe. The second end of the second water supply pipe is provided with three branch water pipes that are evenly distributed around the circumference, and each branch water pipe is provided with a jet nozzle at its lower end.

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