CN114737900A - Static rotational flow well washing device and method for cleaning ground immersed borehole - Google Patents

Static rotational flow well washing device and method for cleaning ground immersed borehole Download PDF

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Publication number
CN114737900A
CN114737900A CN202111618445.2A CN202111618445A CN114737900A CN 114737900 A CN114737900 A CN 114737900A CN 202111618445 A CN202111618445 A CN 202111618445A CN 114737900 A CN114737900 A CN 114737900A
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well
steel pipe
cleaning
static
rotational flow
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王亚安
张翀
王晓东
姚益轩
廖文胜
杜志明
王亚奴
李沁慈
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Beijing Research Institute of Chemical Engineering and Metallurgy of CNNC
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Beijing Research Institute of Chemical Engineering and Metallurgy of CNNC
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    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B21/00Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
    • E21B21/16Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor using gaseous fluids
    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B47/00Survey of boreholes or wells
    • E21B47/006Detection of corrosion or deposition of substances
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00Technologies related to metal processing
    • Y02P10/20Recycling

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  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Mechanical Engineering (AREA)
  • Geophysics (AREA)
  • Cleaning In General (AREA)

Abstract

The invention relates to the technical field of in-situ leaching uranium mining, in particular to a static rotational flow well flushing device and method for cleaning an in-situ leaching drilled hole. The device comprises: the air compressor is connected with the air hose, and the air hose is connected with the steel pipe through the adapter; the tail end in the steel pipe is provided with a rotational flow piece, the rotational flow piece comprises a flow guide cone and a cylinder welded with the bottom surface of the flow guide cone, the flow guide cone is a cone, and rotational flow blades are welded on the side surface of the cylinder at intervals; the thickness of the swirl vanes is gradually enlarged from top to bottom; the top end of the diversion cone faces the end of the adapter. The method comprises the following steps: putting the steel pipe into a filter or a sand setting pipe at the bottom end of the borehole casing; starting an air compressor, enabling gas to enter an inner sleeve of the well through a gas hose and a steel pipe, and starting well washing; and measuring and recording the sand setting height or the drilling flow of the sand setting pipe in the well, closing the air compressor after the well washing requirement is met, lifting the gas conveying pipe out of the well mouth, and finishing the well washing. The invention has high well washing efficiency, simple operation and convenient manufacture.

Description

Static rotational flow well washing device and method for cleaning ground immersed borehole
Technical Field
The invention relates to the technical field of in-situ leaching uranium mining, in particular to a static rotational flow well flushing device and method for cleaning an in-situ leaching drilled hole.
Background
The in-situ leaching uranium mining and metallurgy technology is used for selectively extracting and recycling uranium metal from sandstone uranium ore bodies with certain permeability under a natural burial condition by drilling with chemical solution. The process needs to inject leaching agent underground, seep along the ore bed to leach uranium in the ore, form leachate and lift the leachate out of the earth surface, and separate and recycle metallic uranium in the leachate after hydrometallurgy. In the process of mining, under the action of hydraulic gradient, fine particles of mud and silt in an ore bed are transported towards a liquid pumping well to cause mechanical blockage; the leaching agent reacts with the ore to form chemical precipitates of calcium, magnesium, iron, aluminum and the like, which cause chemical blockage. The pumped well filter and its surrounding formation are the most severe sites for mechanical and chemical plugging. Over time, some of the fine particles and chemical deposits that penetrate the filter into the well bore remain on the inner wall of the filter, some of the fine particles and chemical deposits are deposited in the sand trap below the filter, and even if part of the filter section is buried, the well bore becomes dirty. The phenomenon can cause the reduction of the drilling liquid pumping amount and the reduction of the uranium concentration in the leaching liquid, and the normal production and operation of the mine are greatly influenced. In view of this, well flushing is always the most burdensome daily work of the in-situ leaching uranium mine, and the well flushing process is also an important research topic in the technical field of in-situ leaching uranium mining.
Generally, there are two types of well-flushing methods, chemical and physical. Chemical methods require injection of chemical reagents into the site of the blockage to dissolve the fine particles and chemical precipitates by chemical reaction. However, the used chemical reagent often changes the pH value environment of the stratum at the filter part, and then brings some new impurity ions, and adverse effects are caused to the leaching and subsequent hydrometallurgy procedures such as adsorption, leaching and precipitation. In addition, in a strict sense, the chemical method only plays a role of corrosion, and the plugs are not discharged out of a well mouth, so that the plugs are discharged out of the ground surface by a physical method, and the purpose of dredging a filter and a pore channel of a stratum around the filter is achieved. The physical method for well washing is to dredge the filter and the pore passages of the surrounding stratum and to clean the sand settling pipe at the lower part of the filter by the negative pressure impact, shock, scouring and other effects generated by well washing equipment, such as a wall breaking gun method, a piston method, a compressed air method, a gas-liquid mixed injection method, a gas foam flushing method and the like, wherein the most classical and practical well washing method is the compressed air method.
The compressed air method means that high-pressure air generated by an air compressor is sent into a certain depth in a drilling casing through an air delivery pipeline, an annular space between an air pipe and the casing forms a gas-liquid mixture, the gas-liquid mixture moves upwards under the pushing of the high-pressure air, the specific gravity of the gas-liquid mixture from bottom to top is reduced from large to small, the gas bubbles are reduced from small to large and are broken when the gas bubbles are close to a well mouth, and gas and liquid are separated and are simultaneously sprayed out from the well mouth. At the moment, the formation water continuously and rapidly flows towards the filter, flows into the shaft and is mixed with the compressed air to form continuous gas-liquid mixture flowing out from the wellhead. Fine particles and chemical sediments in the filter and the surrounding stratum, and silt in the sand setting pipe are brought out of the ground surface along with the gas-liquid mixture, so that the well washing effect is achieved.
Although the compressed air method can achieve the purpose of cleaning the drilled hole, the method has some defects, which are mainly reflected in the following aspects:
(1) the cleaning of the ground immersion drill hole usually adopts a PE hose as an air delivery pipe, and because the density of the PE hose is slightly lighter than that of water, air is sealed in the pipe in the lowering process, the air delivery pipe is difficult to be lowered to a filter part or a sand setting surface at one time, and particularly under the conditions of deep drill hole and shallow underground water level of an ore layer, the well washing and the air delivery pipe are needed at the same time. Even like this, some drilling defeated tuber pipe also is difficult to transfer to filter position or sand setting pipe bottom, can not clean the interior sand setting of sand setting pipe completely, and the well-flushing work is hard, time-consuming.
(2) High pressure fluid from the formation simply impacts the plug in the normal direction of the filter and then flows axially out of the wellhead along the casing. Although the impact force to the plug in the normal direction is large, the well washing efficiency of the chemical precipitation which scales on the inner wall of the filter (the wall surface between the filter holes) and the silt deposited in the sand settling pipe is low.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the static rotational flow well washing device and the method for washing the ground immersion drill hole are high in well washing efficiency, simple to operate and convenient to manufacture.
The invention provides a static rotational flow well washing device for cleaning an earth immersed borehole, which comprises: the air compressor, the gas transmission hose, the adapter and the steel pipe;
the air compressor is connected with the air hose, and the air hose is connected with the steel pipe through a conversion joint;
the tail end of the interior of the steel pipe is provided with a rotational flow piece, the rotational flow piece comprises a flow guide cone and a cylinder welded with the bottom surface of the flow guide cone, the flow guide cone is a cone, and rotational flow blades are welded on the side surface of the cylinder at intervals; the thickness of the swirl vanes is gradually enlarged from top to bottom;
the top end of the diversion cone faces the adapter end.
Preferably, the bottom of the cylinder is flush with the bottom end face of the steel pipe.
Preferably, the swirling member is welded to the end inside the steel pipe.
Preferably, the diameter of the steel pipe is consistent with that of the gas transmission hose, the steel pipe and the gas transmission hose are in threaded connection with an adapter, and the adapter is a steel-plastic adapter and a metal hoop is additionally arranged.
Preferably, the diameter of the bottom end face of the diversion cone is 0.35-0.65 times of the inner diameter of the steel pipe, the height-diameter ratio of the diversion cone ranges from 1.5 to 3.5, and the height-diameter ratio of the cylinder ranges from 1.5 to 3.5.
Preferably, the swirl vanes are composed of a plurality of helical vanes, the number of the helical vanes is even and at least 4, the vanes are uniformly arranged on the side surface of the cylinder, and the height of the swirl vanes is consistent with that of the cylinder.
Preferably, the ratio of the thickness of the upper end of the swirl vane to the diameter of the cylinder ranges from 0.05 to 0.35, and the ratio of the thickness of the lower end to the thickness of the upper end ranges from 1.5 to 3.0.
Preferably, the spiral angle of the swirl vanes ranges from 30 degrees to 60 degrees.
Preferably, the rotational flow piece is made of 316L stainless steel or 304 stainless steel.
The invention provides a static rotational flow well washing method for cleaning an earth-immersed borehole, which comprises the following steps:
putting the steel pipe of the static rotational flow well washing device for cleaning the ground immersion borehole in the technical scheme into a filter or a sand setting pipe at the bottom end of an underground casing pipe;
starting an air compressor, enabling gas to enter an inner sleeve of the well through a gas hose and a steel pipe, and starting well washing;
and measuring and recording the sand setting height or the drilling flow of the sand setting pipe in the well, closing the air compressor after the well washing requirement is met, lifting the gas conveying pipe out of the well mouth, and finishing the well washing.
Compared with the prior art, the static rotational flow well washing device for cleaning the ground immersion drill hole adopts the guide cone and the rotational flow blades to construct rotational flow, and the rotational flow is introduced, the turbulent flow is enhanced and the pulse is enhanced by coupling the centrifugal force to unblock the well washing, so that the static rotational flow well washing device is compact in structure and not easy to damage; the gradually-reduced flow channel is constructed by adopting gradually-enlarged blades with variable thicknesses, so that the dynamic pressure of fluid is improved, and high-speed rotational flow can be formed; the stainless steel pipe with the built-in metal diversion cone and the built-in swirl vanes is suitable for the complex fluid environment of in-situ leaching uranium mining, can increase the dead weight of the gas conveying pipe, and is convenient to be placed near a filter part or a sand setting surface at one time. The device design concept is clear, the method is simple and convenient to operate, and the well washing performance is excellent.
Drawings
FIG. 1 is a schematic diagram of a static cyclone well-flushing apparatus for cleaning an earth-immersed borehole;
FIG. 2 is a schematic view of a fluid selection structure;
FIG. 3 shows a schematic plug flow diagram;
FIG. 4 shows a schematic view of a single blade;
in the figure, the position of the upper end of the main shaft,
the method comprises the following steps of 1-an air compressor, 2-an air hose, 3-a crossover joint, 4-a steel pipe, 5-a rotational flow piece, 6-a guide cone, 7-a rotational flow blade, 8-a well head, 9-a sleeve, 10-a reducing flow channel, 11-a filter and 12-a sand setting pipe.
Detailed Description
For a further understanding of the invention, embodiments of the invention are described below in conjunction with the examples, but it should be understood that these descriptions are included merely to further illustrate features and advantages of the invention, and are not intended to limit the invention.
The embodiment of the invention discloses a static rotational flow well washing device for cleaning an earth immersed borehole, which comprises the following components in percentage by weight as shown in figure 1: the device comprises an air compressor 1, a gas transmission hose 2, an adapter 3 and a steel pipe 4;
the air compressor 1 is connected with the air hose 2, and the air hose 2 is connected with the steel pipe 4 through the adapter 3;
the tail end inside the steel pipe 4 is provided with a rotational flow piece 5, preferably, the rotational flow piece is welded at the tail end inside the steel pipe, the bottom of the cylinder is flush with the bottom end face of the steel pipe,
as shown in fig. 2 and 3, the cyclone 5 comprises a conical guide cone 6 and a cylinder welded to the bottom surface of the conical guide cone 6, and the conical guide cone 6 is used for guiding the gas to uniformly enter the flow channel of the cyclone blade 7; the swirl vanes 7 are welded on the side surface of the cylinder at intervals to form swirl channels; the essence of the rotational flow channel between the rotational flow blades is that axial flow fluid is changed into rotational flow fluid, namely the fluid is changed from linear motion to tangential motion, and high-speed rotational flow is generated by the action of coupling centrifugal force to wash out plugs and bottom mud and sand.
The top end of the diversion cone 6 faces the adapter end.
The diameter of the steel pipe 4 is consistent with that of the gas transmission hose 2, the steel pipe 4 and the gas transmission hose 2 are in threaded connection with the adapter 3, and the adapter 3 is a steel-plastic adapter and is additionally provided with a metal hoop.
The diameter of the bottom end face of the diversion cone 6 is 0.35-0.65 times of the inner diameter of the steel pipe, the height-diameter ratio range of the diversion cone is 1.5-3.5, and the height-diameter ratio range of the cylinder is 1.5-3.5.
The swirl vanes 7 are composed of a plurality of helical vanes, the number of the helical vanes is even and is at least 4, the vanes are uniformly arranged on the side surface of the cylinder, and the height of the swirl vanes is consistent with that of the cylinder.
The thickness of the rotational flow blade 7 is gradually enlarged from top to bottom, the ratio range of the thickness of the upper end to the diameter of the cylinder is 0.05-0.35, and the ratio range of the thickness of the lower end to the thickness of the upper end is 1.5-3.0. The designed swirl vane increases the fluid flow velocity through the reduction of the flow passage sectional area, improves the fluid dynamic pressure, and further constructs high-speed swirl.
The bottom ends of the rotational flow blades 7, namely the bottom ends of the cylinders are flush with the bottom end of the steel pipe, so that the formed high-speed rotational flow can immediately enter an annular space between the gas conveying pipe and the well casing.
The spiral angle range of the rotational flow blades 7 is 30-60 degrees.
The rotational flow piece 5 adopts 316L stainless steel or 304 stainless steel. The acidity of the reagent adopted during in-situ leaching uranium mining is properly selected. When acid leaching is carried out, 316L stainless steel is adopted as a material; when the immersion is neutral, 304 stainless steel is used as the material.
The embodiment of the invention also discloses a static rotational flow well washing method for cleaning the ground immersed borehole, which comprises the following steps:
putting the steel pipe of the static rotational flow well washing device for cleaning the ground immersion borehole in the technical scheme into a filter or a sand setting pipe at the bottom end of an underground casing;
starting an air compressor, enabling gas to enter an inner sleeve of the well through a gas hose and a steel pipe, and starting well washing;
and measuring and recording the sand setting height or the drilling flow of the sand setting pipe in the well, closing the air compressor after the well washing requirement is met, lifting the gas conveying pipe out of the well mouth, and finishing the well washing.
The working principle is as follows: air is blown out by the air compressor 1, enters the gas transmission hose 2, and enters the casing 9 through the wellhead 8. The air flow flows to the steel pipe 4 along the air hose 2, and the connection between the air hose 2 and the steel pipe 4 can be realized through the steel-plastic adapter 3. The air flow continues to flow downwards along the steel pipe 4 and is uniformly guided to a tapered flow passage 10 formed by the swirl vanes 7 by the guide cone 6, at the moment, the air flow is converted from axial movement to tangential movement and enters an annular space between the air hose 2, the steel pipe 4 and the sleeve 9, and a gas-liquid swirl mixture is formed. The gas-liquid mixture rotates and moves upwards under the drive of high-pressure air, the specific gravity of the gas-liquid mixture is changed from large to small from bottom to top, the bubbles are changed from small to large, and the bubbles break when approaching a wellhead 8, so that gas-liquid separation is realized, and the gas-liquid mixture is sprayed out from the wellhead simultaneously. At this time, a great pressure difference is formed between the casing 9 and the formation water, the formation water rapidly flows into the casing 9 through the filter 11, and forms a gas-liquid rotational flow mixture with the gas from the gas transmission hose 2 and the steel pipe 4, the gas-liquid rotational flow mixture further stirs the sand setting in the sand setting pipe 12 at the bottom of the well, washes the pore canal and the inner wall of the filter 11 and the inner wall of the casing 9, and rotates to carry the blockage upwards to be discharged out of the well mouth 8, so that the purpose of well washing is achieved.
For chemical scaling of the inner wall of the filter, the tangential shearing force is provided, so that scaling can be removed more conveniently; meanwhile, a rotational flow field and a turbulent flow field are formed near the filter part or the sand setting surface in the sleeve, so that the upward movement of the sand setting at the bottom is favorably stirred, and the drilling hole cleaning work efficiency is higher and more thorough.
In addition, in a rotational flow field, the tangential velocity is distributed in a double vortex mode along the radial direction of the sleeve or the filter, namely, the tangential velocity close to the side wall is quasi-forced vortex, the tangential velocity close to the center is quasi-free vortex, and the maximum tangential velocity is 3-4 times of the incident velocity; the distribution of tangential velocity is due to the distribution of pressure in the swirl field, which enhances the pulse effect of formation water entering the filter compared to no swirl.
Compared with a compressed air method, the invention introduces the centrifugal force effect, not only is more easy to strengthen turbulence in the well so as to drive the plug to move, but also the constructed tangential force provides new technical support for dredging the underground filter, scouring the inner wall of the filter, stirring settled sand and scouring the inner wall of the sleeve; meanwhile, a high-speed rotational flow can be constructed by adopting a flow passage tapered rotational flow outlet, and the higher the rotational flow speed is, the easier the filter, the sand settling pipe and the sleeve are washed away on one hand, and the easier the blockage is carried to flow on the other hand; also because of the swirl effect, the pressure inside the casing is redistributed, which enhances the pulsing effect of formation water entering the filter; in addition, the static parts are adopted, so that the bearing capacity is higher and the resistance is lower in practical application. Therefore, the invention can greatly improve the effect of the existing well washing device on the premise of not changing the installation mode of the original compressed air method and occupying additional space.
For further understanding of the present invention, the present invention provides a static cyclone well-flushing device for cleaning an earth-immersed borehole, which is described in detail with reference to the following examples, but the scope of the present invention is not limited by the following examples.
Example 1
Dipping uranium mining well in two-basin ground of inner Mongolia
The uranium mine depth is more than 300m, and the inner diameter of the liquid-extracting hole sleeve is DN 128 mm; the design pressure of the fan is 5MPa, the actual work is about 3.5MPa, the inner diameter of the air conveying pipe is DN 25mm, and the length of the steel pipe is 1 m; the height of the diversion cone is 20mm, and the diameter of the bottom circle is 9 mm; the number of the swirl blades is 6, namely the rotation angle of the blades is 60 degrees (360 degrees/6 degrees is 60 degrees), the helix angle is set to be 60 degrees, the vertical height is 25mm, the width is 7mm, the diameter of a cylinder for bearing the blades is 9mm, so that the blades and the inner wall of a gas conveying pipe are convenient to weld, the thickness of the top of each blade is 1mm, and the thickness of the bottom of each blade is 2mm, as shown in fig. 3.
According to the result of measuring the height of the settled sand in the settled sand pipe, two wells with the height of the settled sand close to each other are selected, the height is about 6m, one well is washed by a conventional compressed air method, and the other well is washed by the method. Connecting the test device, and lowering the gas pipe to start well washing. The test result shows that: the gas conveying pipe can be put down in place at one time, and under the same operation parameters, when the sand setting heights of the two wells are consistent (the sand setting height is less than 1m and is 0.5-0.6 m), the time used by a compressed air method is about 2.5 hours, the time used by the method is about 1.5 hours, and the efficiency is improved by 40%. Therefore, on the premise of equivalent well washing effect, the well washing time can be saved, and the well washing effect can be obviously improved after the centrifugal force is coupled.
Example 2
The method is characterized in that a certain in-situ leaching uranium mining well in the Yili basin in Xinjiang is an in-situ leaching uranium mining well which runs for years, and whether the well is washed or not is determined by judging the liquid pumping amount. In normal production, the amount of liquid drawn is generally greater than 4m3H, when the liquid pumping quantity is reduced to 2m3Below/h downhole plugging is considered severe, where the purpose of well flushing is to increase the amount of fluid pumped.
The uranium mine depth is more than 350m, and the inner diameter of the liquid-extracting hole sleeve is DN 128 mm; the design pressure of the fan is 5MPa, the actual work is about 3.5MPa, the inner diameter of the air conveying pipe is DN 25mm, and the length of the steel pipe is 1 m; the height of the diversion cone is 20mm, and the diameter of the bottom circle is 9 mm; the number of the swirl blades is 8, namely the rotation angle of the blades is 45 degrees (360 degrees/8 degrees is 45 degrees), the helix angle is set to be 50 degrees, the vertical height is 25mm, the width is 7mm, the diameter of the cylinder for bearing the blades is 9mm, so that the blades and the inner wall of the gas conveying pipe are conveniently welded, the thickness of the top of each blade is 1mm, and the thickness of the bottom of each blade is 1.5 mm.
Through underground television observation and sampling analysis, the blockage of the sleeve and the filter is serious, and the blockage species are mainly fine sand, flocculent coagula and gelatinous substance precipitation. The amount of the two liquid extractions is selected to be less than 2m3The wells/h are designated well A and well B, respectively, with the well A pumping capacity being about 1.85m3Per, the well B liquid pumping capacity is about 1.80m3H is used as the reference value. The well A is washed by a compressed air method, and the well B is washed by the invention. Connecting the test device, and lowering the gas pipe to start well washing. The test result shows that: the gas delivery pipe can be lowered in place at one time, and under the same operating parameters, for the well A, when the liquid pumping amount reaches 4.0m3The time for flushing the well is about 4 hours; for well B, when the liquid pumping amount reaches 4.0m3The time for flushing is about 3 hours. Further, when the amount of liquid drawn reaches 4.0m3The well was continuously washed for 2 hours after/h: for well A, the amount of fluid pumped was 4.5m3H; for well B, the liquid pumping amount can reach 5.2m3H (at this time, the sand setting height of both well A and well B is less than 1 m).
The above description of the embodiments is only intended to facilitate the understanding of the method of the invention and its core idea. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A static cyclonic well cleaning apparatus for cleaning an earth-immersed borehole, comprising: the air compressor, the gas transmission hose, the adapter and the steel pipe;
the air compressor is connected with the air delivery hose, and the air delivery hose is connected with the steel pipe through the adapter;
the tail end of the interior of the steel pipe is provided with a rotational flow piece, the rotational flow piece comprises a flow guide cone and a cylinder welded with the bottom surface of the flow guide cone, the flow guide cone is a cone, and rotational flow blades are welded on the side surface of the cylinder at intervals; the thickness of the swirl vanes is gradually enlarged from top to bottom;
the top end of the diversion cone faces the adapter end.
2. A static cyclonic well-flushing apparatus for cleaning an inground borehole as claimed in claim 1 wherein the bottom of the cylindrical body is flush with the bottom end face of the steel pipe.
3. A static swirl well-flushing device for cleaning an inground borehole according to claim 1 wherein the swirl element is welded to the end of the interior of the steel pipe.
4. The static cyclone well-flushing device for cleaning ground immersed borehole according to claim 1 characterized in that the diameter of said steel pipe is the same as the diameter of said gas hose, the steel pipe and the gas hose are connected with the conversion joint by screw thread, said conversion joint is steel-plastic conversion joint, and the metal hoop is added.
5. The static cyclone well-flushing device for cleaning the ground-immersed borehole according to claim 1, wherein the diameter of the bottom end face of the diversion cone is 0.35-0.65 times the inner diameter of the steel pipe, the height-diameter ratio of the diversion cone ranges from 1.5 to 3.5, and the height-diameter ratio of the cylinder ranges from 1.5 to 3.5.
6. The static cyclone well-flushing device for cleaning ground-immersed boreholes as claimed in claim 1 characterized in that said cyclone blades consist of a plurality of helical blades, the number of which is even and at least 4, the blades are evenly arranged on the side of the cylinder, the height of said cyclone blades is identical to the height of said cylinder.
7. The static cyclone well-flushing apparatus for cleaning an earth-immersed borehole according to claim 1, wherein the ratio of the upper end thickness of said cyclone blade to the diameter of said cylindrical body is in the range of 0.05 to 0.35, and the ratio of the lower end thickness to the upper end thickness is in the range of 1.5 to 3.0.
8. The static cyclonic well-flushing apparatus for cleaning an earth-immersed borehole as claimed in claim 1, wherein the helical angle of the said cyclonic blade is in the range of 30 ° to 60 °.
9. The static cyclone well-flushing apparatus for cleaning an inground drilling hole of claim 1 wherein said cyclone is 316L stainless steel or 304 stainless steel.
10. A static rotational flow well washing method for cleaning an earth-immersed borehole is characterized by comprising the following steps:
placing a steel pipe of the static cyclone well washing device for cleaning the ground immersion borehole according to any one of claims 1 to 9 into a filter or a sand setting pipe part at the bottom end of an inner sleeve of the borehole;
starting an air compressor, enabling gas to enter an inner sleeve of the well through a gas hose and a steel pipe, and starting well washing;
and measuring and recording the sand setting height or the drilling flow of the sand setting pipe in the well, closing the air compressor after the well washing requirement is met, lifting the gas conveying pipe out of the well mouth, and finishing the well washing.
CN202111618445.2A 2021-12-27 2021-12-27 Static rotational flow well washing device and method for cleaning ground immersed borehole Pending CN114737900A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117127970A (en) * 2023-10-26 2023-11-28 四川圣诺油气工程技术服务有限公司 Liquid detection sampling open well integrated operation tool and use method

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