A double duct negative pressure sweeping and spraying mud skin treatment device and treatment method

Abstract

The application aims to provide a double-air-pipe negative pressure sweeping and spraying mud skin treatment device and method.

Description

Technical Field

[0001] This invention relates to the field of negative pressure sweeping and spraying technology, and in particular to a dual-duct negative pressure sweeping and spraying mud skin treatment device and method. Background Technology

[0002] During the construction of dewatering wells and water source heat pump wells in foundation pits, a certain amount of clay is sometimes added to prevent collapse. Some strata themselves also produce mud cake and fine particles, resulting in poor permeability of these wells, which adversely affects dewatering and reinjection. Common treatment methods include air-lift reverse circulation and piston well washing. However, these methods only achieve the purpose of cleaning sediment and replacing mud in the borehole through negative pressure pumping, and cannot achieve high-pressure flushing of the inside and outside of the filter pipe. They cannot break up and remove slightly thick or large mud cakes. The effect is even worse when well washing is carried out long after the dewatering well construction is completed. Summary of the Invention

[0003] The purpose of this invention is to provide a dual-duct negative pressure sweeping and spraying mud skin treatment device and method. By using high-pressure rotating sweeping and spraying to flush the mud skin inside and outside the filter pipe, it can not only pump out fine particulate sediment and replace mud, but also open up the hydraulic connection between the inside and outside of the well, thereby improving the permeability of the filter section.

[0004] To achieve the above-mentioned objectives, the technical solution adopted by this invention is as follows:

[0005] A dual-duct negative pressure sweeping and spraying mud skin treatment device and method, including a working mode and construction process, wherein the construction process includes the following steps:

[0006] Step 1: Install the negative pressure sweeping and spraying device: After the negative pressure sweeping and spraying device is assembled, it is lowered below the water surface in the well using a lifting cable.

[0007] Step 2, high-volume sweeping and spraying to break up the mud skin: Start the air compressor, open the valve of the sweeping and spraying air pipe, and start continuous high-pressure ventilation to the sweeping and spraying nozzle to start the high-volume sweeping and spraying operation; at the same time, slowly lower the negative pressure sweeping and spraying device through the lifting cable, and the sweeping and spraying nozzle will sweep and spray the mud skin inside and outside the filter pipe layer by layer until the bottom of the hole.

[0008] Step 3: Variable air volume sweeping, spraying, swirling, flushing, high air volume negative pressure extraction and slag removal: After the high air volume sweeping and spraying reaches the bottom of the hole, maintain the sweeping and spraying for a period of time; then open the valve of the negative pressure air pipe to the maximum, and then adjust the air pressure of the sweeping and spraying air pipe at intervals to start the variable air volume sweeping, spraying, swirling, and slag removal and slag removal operation until the water is clear and the sand is clean.

[0009] Step 4: High-volume negative pressure sweeping and spraying reciprocating lifting treatment of residues: After the bottom sediment is cleaned and the water and sand are clear, the air pressure of the adjustable pressure dual air pipe is increased at the same time. Then the negative pressure sweeping and spraying device is reciprocated and lifted. The negative pressure nozzle and the sweeping nozzle operate at high air volume at the same time to re-treat the mud and fine particles remaining inside and outside the filter pipe with negative pressure sweeping and pumping and replacement treatment layer by layer.

[0010] Step 5, High-volume negative pressure pumping and replacement of mud: After the reciprocating negative pressure sweeping and spraying operation reaches the bottom of the well, close the sweeping and spraying air pipe and at the same time increase the air pressure of the negative pressure air pipe. The negative pressure nozzle will pump and replace mud at maximum efficiency and start the slag removal and mud replacement in the well. Stop ventilation and end the negative pressure sweeping and spraying operation in the well when the water and sand are clear and the fine particle content meets the specifications and design requirements.

[0011] Step 6, retrieve the negative pressure sweeping and spraying device: After the negative pressure sweeping and spraying operation in the well is completed, the lifting cable is retrieved at a constant speed by the ground winch, and the negative pressure sweeping and spraying device is pulled out of the wellhead at a constant speed, completing the entire construction process.

[0012] Furthermore, the key points of the construction process include the following steps:

[0013] Step 1: Install the negative pressure sweeping and spraying device. The key points are: the negative pressure sweeping and spraying device must be firmly assembled to ensure sealing; the semi-flexible slag discharge pipe and the adjustable pressure double air pipe should be lowered into the well at a uniform speed along with the lifting cable and fixed together to prevent scraping the well wall.

[0014] Step two involves high-volume sweeping, spraying, and swirling to break up the mud skin. The key points are: the lifting cable needs to be lowered slowly and at a uniform speed, and the lowering depth needs to be recorded by passing through the scale on the semi-flexible slag discharge pipe; for strata with poor permeability and effective filter sections, sweeping and spraying at a fixed position for a certain period of time is required to ensure the mud skin treatment effect.

[0015] Step 3: Variable air volume sweeping and swirling flushing with high air volume negative pressure extraction and slag removal. The key points are: after sweeping and spraying to the bottom of the hole, adjust the air pressure of the sweeping and spraying air pipe every 1 to 2 minutes to change from constant air volume sweeping and spraying to variable air volume sweeping and spraying, thereby repeatedly swirling the sediment around the bottom of the well; the valve of the negative pressure air pipe needs to be opened to the maximum, and high air pressure and high air volume gas is sprayed upward from the negative pressure nozzle to form a local vacuum, achieving a strong negative pressure extraction effect, and expelling sediment, mud, fine particles, etc. from the bottom of the well.

[0016] Step 4: High-volume negative pressure sweeping and spraying reciprocating up and down to treat the residue. The key point is to open the valves of both the sweeping and spraying air pipe and the negative pressure air pipe to the maximum to ensure that the mud and fine particles generated during the reciprocating up and down sweeping and spraying process are pumped out of the well, with the aim of reducing redeposition at the bottom.

[0017] Step 5, high-volume negative pressure pumping and replacement of mud, the key points of which are: close the valve of the sweeping and spraying air pipe and open the valve of the negative pressure air pipe to the maximum; at this time, only the negative pressure nozzles are working, and the negative pressure pumping and drainage volume in the pipe reaches the maximum value; it can more efficiently and powerfully pump and replace mud, and clear the hydraulic channels in the formation; it must be stopped when the water and sand are clear and meet the design requirements.

[0018] Step six, retract the negative pressure sweeping and spraying device. The key points are: when retracting the lifting cable at a uniform speed using a ground winch, ensure that the variable pressure dual air pipes are lifted synchronously. At the same time, during the lifting process, try to keep the lifting cable in the center area of ​​the well pipe to prevent it from scraping the filter pipe.

[0019] Furthermore, the operating mode includes the following modes:

[0020] Mode 1: High-volume sweeping, spraying, and swirling cleaning;

[0021] Mode 2: Variable air volume sweeping, spraying, swirling, high air volume negative pressure extraction;

[0022] Mode 3: High-volume sweeping, spraying, swirling, high-volume negative pressure extraction;

[0023] Mode 4: High-volume negative pressure extraction and replacement.

[0024] Furthermore, the technological principle of the aforementioned working mode is as follows:

[0025] Mode 1, high-volume sweeping and spraying vortex cleaning, its process principle is: the sweeping nozzle works at high air volume, the negative pressure nozzle does not work; the sweeping air pipe valve is opened to the maximum, and the negative pressure air pipe valve is closed; this process is mainly used when sweeping and spraying to break up the mud skin inside and outside the well pipe.

[0026] Mode 2, variable air volume sweeping spray swirling high air volume negative pressure extraction, its process principle is: the sweeping spray nozzle operates with variable air volume, and the negative pressure nozzle operates with high air volume; the sweeping spray air pipe valves are adjusted at intervals, and the negative pressure air pipe valves are opened to the maximum; this process is mainly used for sweeping spray swirling agitation of sediment and negative pressure extraction of sediment and fine particles at the bottom of the hole.

[0027] Mode 3, high-volume sweeping spraying and swirling high-volume negative pressure extraction, its process principle is: the sweeping spray nozzle and the negative pressure nozzle work at high air volume at the same time; the sweeping spraying duct valve and the negative pressure duct valve are both opened to the maximum; this process is mainly used for the repeated treatment of residual sediment and fine particles by sweeping spraying and swirling sediment and negative pressure extraction.

[0028] Mode 4, high-volume negative pressure exhaust and replacement, its process principle is: the sweeping nozzle is not working, the negative pressure nozzle works with high air volume; the sweeping air pipe valve is closed, and the negative pressure air pipe valve is opened to the maximum; this process is mainly used after the negative pressure sweeping treatment of mud skin in the hole is completed, and the residual mud is replaced until the water and sand are clear.

[0029] The beneficial effects of this invention are as follows:

[0030] This invention discloses a dual-duct negative pressure sweeping and spraying mud skin treatment device and method. By using high-pressure rotating sweeping and spraying to flush the mud skin inside and outside the filter pipe, it can not only pump out fine particulate sediment and replace mud, but also open up the hydraulic connection between the inside and outside of the well, thereby improving the permeability of the filter section. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the construction process of a dual-duct negative pressure sweeping and spraying mud skin treatment device and method according to the present invention;

[0032] Figure 2 This is a schematic diagram illustrating the working mode and process principle of a dual-duct negative pressure sweeping and spraying mud skin treatment device and method of the present invention. Detailed Implementation

[0033] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings. Identical components are indicated by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to directions in the accompanying drawings, while the terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0034] To make the content of this invention easier to understand, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Identical components are indicated by the same reference numerals.

[0035] according to Figures 1 to 2 As shown, a dual-duct negative pressure sweeping and spraying mud skin treatment device and method are disclosed, including working mode and construction process. The construction process includes the following steps:

[0036] Step 1: Install the negative pressure sweeping and spraying device: After the negative pressure sweeping and spraying device is assembled, it is lowered below the water surface in the well using a lifting cable.

[0037] Step 2, high-volume sweeping and spraying to break up the mud skin: Start the air compressor, open the valve of the sweeping and spraying air pipe, and start continuous high-pressure ventilation to the sweeping and spraying nozzle to start the high-volume sweeping and spraying operation; at the same time, slowly lower the negative pressure sweeping and spraying device through the lifting cable, and the sweeping and spraying nozzle will sweep and spray the mud skin inside and outside the filter pipe layer by layer until the bottom of the hole.

[0038] Step 3: Variable air volume sweeping, spraying, swirling, flushing, high air volume negative pressure extraction and slag removal: After the high air volume sweeping and spraying reaches the bottom of the hole, maintain the sweeping and spraying for a period of time; then open the valve of the negative pressure air pipe to the maximum, and then adjust the air pressure of the sweeping and spraying air pipe at intervals to start the variable air volume sweeping, spraying, swirling, and slag removal and slag removal operation until the water is clear and the sand is clean.

[0039] Step 4: High-volume negative pressure sweeping and spraying reciprocating lifting treatment of residues: After the bottom sediment is cleaned and the water and sand are clear, the air pressure of the adjustable pressure dual air pipe is increased at the same time. Then the negative pressure sweeping and spraying device is reciprocated and lifted. The negative pressure nozzle and the sweeping nozzle operate at high air volume at the same time to re-treat the mud and fine particles remaining inside and outside the filter pipe with negative pressure sweeping and pumping and replacement treatment layer by layer.

[0040] Step 5, High-volume negative pressure pumping and replacement of mud: After the reciprocating negative pressure sweeping and spraying operation reaches the bottom of the well, close the sweeping and spraying air pipe and at the same time increase the air pressure of the negative pressure air pipe. The negative pressure nozzle will pump and replace mud at maximum efficiency and start the slag removal and mud replacement in the well. Stop ventilation and end the negative pressure sweeping and spraying operation in the well when the water and sand are clear and the fine particle content meets the specifications and design requirements.

[0041] Step 6, retrieve the negative pressure sweeping and spraying device: After the negative pressure sweeping and spraying operation in the well is completed, the lifting cable is retrieved at a constant speed by the ground winch, and the negative pressure sweeping and spraying device is pulled out of the wellhead at a constant speed, completing the entire construction process.

[0042] The key points of the construction process include the following steps:

[0043] Step 1: Install the negative pressure sweeping and spraying device. The key points are: the negative pressure sweeping and spraying device must be firmly assembled to ensure sealing; the semi-flexible slag discharge pipe and the adjustable pressure double air pipe should be lowered into the well at a uniform speed along with the lifting cable and fixed together to prevent scraping the well wall.

[0044] Step two involves high-volume sweeping, spraying, and swirling to break up the mud skin. The key points are: the lifting cable needs to be lowered slowly and at a uniform speed, and the lowering depth needs to be recorded by passing through the scale on the semi-flexible slag discharge pipe; for strata with poor permeability and effective filter sections, sweeping and spraying at a fixed position for a certain period of time is required to ensure the mud skin treatment effect.

[0045] Step 3: Variable air volume sweeping and swirling flushing with high air volume negative pressure extraction and slag removal. The key points are: after sweeping and spraying to the bottom of the hole, adjust the air pressure of the sweeping and spraying air pipe every 1 to 2 minutes to change from constant air volume sweeping and spraying to variable air volume sweeping and spraying, thereby repeatedly swirling the sediment around the bottom of the well; the valve of the negative pressure air pipe needs to be opened to the maximum, and high air pressure and high air volume gas is sprayed upward from the negative pressure nozzle to form a local vacuum, achieving a strong negative pressure extraction effect, and expelling sediment, mud, fine particles, etc. from the bottom of the well.

[0046] Step 4: High-volume negative pressure sweeping and spraying reciprocating up and down to treat the residue. The key point is to open the valves of both the sweeping and spraying air pipe and the negative pressure air pipe to the maximum to ensure that the mud and fine particles generated during the reciprocating up and down sweeping and spraying process are pumped out of the well, with the aim of reducing redeposition at the bottom.

[0047] Step 5, high-volume negative pressure pumping and replacement of mud, the key points of which are: close the valve of the sweeping and spraying air pipe and open the valve of the negative pressure air pipe to the maximum; at this time, only the negative pressure nozzles are working, and the negative pressure pumping and drainage volume in the pipe reaches the maximum value; it can more efficiently and powerfully pump and replace mud, and clear the hydraulic channels in the formation; it must be stopped when the water and sand are clear and meet the design requirements.

[0048] Step six, retract the negative pressure sweeping and spraying device. The key points are: when retracting the lifting cable at a uniform speed using a ground winch, ensure that the variable pressure dual air pipes are lifted synchronously. At the same time, during the lifting process, try to keep the lifting cable in the center area of ​​the well pipe to prevent it from scraping the filter pipe.

[0049] The working modes include the following:

[0050] Mode 1: High-volume sweeping, spraying, and swirling cleaning;

[0051] Mode 2: Variable air volume sweeping, spraying, swirling, high air volume negative pressure extraction;

[0052] Mode 3: High-volume sweeping, spraying, swirling, high-volume negative pressure extraction;

[0053] Mode 4: High-volume negative pressure extraction and replacement.

[0054] The working principle of the process is as follows:

[0055] Mode 1, high-volume sweeping and spraying vortex cleaning, its process principle is: the sweeping nozzle works at high air volume, the negative pressure nozzle does not work; the sweeping air pipe valve is opened to the maximum, and the negative pressure air pipe valve is closed; this process is mainly used when sweeping and spraying to break up the mud skin inside and outside the well pipe.

[0056] Mode 2, variable air volume sweeping spray swirling high air volume negative pressure extraction, its process principle is: the sweeping spray nozzle operates with variable air volume, and the negative pressure nozzle operates with high air volume; the sweeping spray air pipe valves are adjusted at intervals, and the negative pressure air pipe valves are opened to the maximum; this process is mainly used for sweeping spray swirling agitation of sediment and negative pressure extraction of sediment and fine particles at the bottom of the hole.

[0057] Mode 3, high-volume sweeping spraying and swirling high-volume negative pressure extraction, its process principle is: the sweeping spray nozzle and the negative pressure nozzle work at high air volume at the same time; the sweeping spraying duct valve and the negative pressure duct valve are both opened to the maximum; this process is mainly used for the repeated treatment of residual sediment and fine particles by sweeping spraying and swirling sediment and negative pressure extraction.

[0058] Mode 4, high-volume negative pressure exhaust and replacement, its process principle is: the sweeping nozzle is not working, the negative pressure nozzle works with high air volume; the sweeping air pipe valve is closed, and the negative pressure air pipe valve is opened to the maximum; this process is mainly used after the negative pressure sweeping treatment of mud skin in the hole is completed, and the residual mud is replaced until the water and sand are clear.

[0059] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for treating sludge skin by dual-duct negative pressure sweeping and spraying, characterized in that, This includes the working mode and construction process, the construction process including the following steps: Step 1: Install the negative pressure sweeping and spraying device: After the negative pressure sweeping and spraying device is assembled, it is lowered below the water surface in the well using a lifting cable. Step 2, high-volume sweeping and spraying to break up the mud skin: Start the air compressor, open the valve of the sweeping and spraying air pipe, and start continuous high-pressure ventilation to the sweeping and spraying nozzle to start the high-volume sweeping and spraying operation; at the same time, slowly lower the negative pressure sweeping and spraying device through the lifting cable, and the sweeping and spraying nozzle will sweep and spray the mud skin inside and outside the filter pipe layer by layer until the bottom of the hole. Step 3: Variable air volume sweeping, spraying, swirling, flushing, high air volume negative pressure extraction and slag removal: After the high air volume sweeping and spraying reaches the bottom of the hole, maintain the sweeping and spraying for a period of time; then open the valve of the negative pressure air pipe to the maximum, and then adjust the air pressure of the sweeping and spraying air pipe at intervals to start the variable air volume sweeping, spraying, swirling, and slag removal and slag removal operation until the water is clear and the sand is clean. Step 4: High-volume negative pressure sweeping and spraying reciprocating lifting treatment of residues: After the bottom sediment is cleaned and the water and sand are clear, the air pressure of the adjustable pressure dual air pipe is increased at the same time. Then the negative pressure sweeping and spraying device is reciprocated and lifted. The negative pressure nozzle and the sweeping nozzle operate at high air volume at the same time to re-treat the mud and fine particles remaining inside and outside the filter pipe with negative pressure sweeping and pumping and replacement treatment layer by layer. Step 5, High-volume negative pressure pumping and replacement of mud: After the reciprocating negative pressure sweeping and spraying operation reaches the bottom of the well, close the sweeping and spraying air pipe and at the same time increase the air pressure of the negative pressure air pipe. The negative pressure nozzle will pump and replace mud at maximum efficiency and start the slag removal and mud replacement in the well. Stop ventilation and end the negative pressure sweeping and spraying operation in the well when the water and sand are clear and the fine particle content meets the specifications and design requirements. Step 6, retrieve the negative pressure sweeping and spraying device: After the negative pressure sweeping and spraying operation in the well is completed, the lifting cable is retrieved at a constant speed by the ground winch, and the negative pressure sweeping and spraying device is pulled out of the wellhead at a constant speed, completing the entire construction process.

2. The method for treating sludge skin by dual-duct negative pressure sweeping and spraying according to claim 1, characterized in that, The key points of the construction process include the following steps: Step 1: Install the negative pressure sweeping and spraying device. The key points are: the negative pressure sweeping and spraying device must be firmly assembled to ensure sealing; the semi-flexible slag discharge pipe and the adjustable pressure double air pipe should be lowered into the well at a uniform speed along with the lifting cable and fixed together to prevent scraping the well wall. Step two involves high-volume sweeping, spraying, and swirling to break up the mud skin. The key points are: the lifting cable needs to be lowered slowly and at a uniform speed, and the lowering depth needs to be recorded by passing through the scale on the semi-flexible slag discharge pipe; for strata with poor permeability and effective filter sections, sweeping and spraying at a fixed position for a certain period of time is required to ensure the mud skin treatment effect. Step 3: Variable air volume sweeping and swirling flushing with high air volume negative pressure extraction and slag removal. The key points are: after sweeping and spraying to the bottom of the hole, adjust the air pressure of the sweeping and spraying air pipe every 1 to 2 minutes to change from constant air volume sweeping and spraying to variable air volume sweeping and spraying, thereby repeatedly swirling the sediment around the bottom of the well; the valve of the negative pressure air pipe needs to be opened to the maximum, and high air pressure and high air volume gas is sprayed upward from the negative pressure nozzle to form a local vacuum, achieving a strong negative pressure extraction effect, and discharging the sediment, mud, and fine particles from the bottom of the well out of the well; Step 4: High-volume negative pressure sweeping and spraying reciprocating up and down to treat the residue. The key point is to open the valves of both the sweeping and spraying air pipe and the negative pressure air pipe to the maximum to ensure that the mud and fine particles generated during the reciprocating up and down sweeping and spraying process are pumped out of the well, with the aim of reducing redeposition at the bottom. Step 5, high-volume negative pressure pumping and replacement of mud, the key points of which are: close the valve of the sweeping and spraying air pipe and open the valve of the negative pressure air pipe to the maximum; at this time, only the negative pressure nozzles are working, and the negative pressure pumping and drainage volume in the pipe reaches the maximum value; it can more efficiently and powerfully pump and replace mud, and clear the hydraulic channels in the formation; it must be stopped when the water and sand are clear and meet the design requirements. Step six, retract the negative pressure sweeping and spraying device. The key points are: when retracting the lifting cable at a uniform speed using a ground winch, ensure that the variable pressure dual air pipes are lifted synchronously. At the same time, during the lifting process, try to keep the lifting cable in the center area of ​​the well pipe to prevent it from scraping the filter pipe.

3. The method for treating sludge skin by dual-duct negative pressure sweeping and spraying according to claim 1, characterized in that, The operating modes include the following modes: Mode 1: High-volume sweeping, spraying, and swirling cleaning; Mode 2: Variable air volume sweeping, spraying, swirling, high air volume negative pressure extraction; Mode 3: High-volume sweeping, spraying, swirling, high-volume negative pressure extraction; Mode 4: High-volume negative pressure extraction and replacement.

4. The method for treating sludge skin by dual-duct negative pressure sweeping and spraying according to claim 3, characterized in that, The technological principle of the aforementioned working mode is as follows: Mode 1, high-volume sweeping and spraying vortex cleaning, its process principle is: the sweeping nozzle works at high air volume, the negative pressure nozzle does not work; the sweeping air pipe valve is opened to the maximum, and the negative pressure air pipe valve is closed; this process is used when sweeping and spraying breaks up the mud skin inside and outside the well pipe; Mode 2, variable air volume sweeping spray swirling high air volume negative pressure extraction, its process principle is: the sweeping spray nozzle operates with variable air volume, and the negative pressure nozzle operates with high air volume; the sweeping spray air pipe valves are adjusted at intervals, and the negative pressure air pipe valves are opened to the maximum; this process is used when sweeping spray swirling agitates sediment and negative pressure extraction holes to remove sediment and fine particles. Mode 3, high-volume sweeping spraying and swirling high-volume negative pressure extraction, its process principle is: the sweeping spray nozzle and the negative pressure nozzle work at high air volume at the same time; the sweeping spraying duct valve and the negative pressure duct valve are both opened to the maximum; this process is used to repeatedly treat residual sediment and fine particles by sweeping spraying and swirling sediment and negative pressure extraction. Mode 4, high-volume negative pressure exhaust and replacement, its process principle is: the sweeping nozzle is not working, the negative pressure nozzle works with high air volume; the sweeping air pipe valve is closed, and the negative pressure air pipe valve is opened to the maximum; this process is used after the negative pressure sweeping treatment of mud skin in the hole is completed, and the residual mud is replaced until the water and sand are clear.

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