CN112576211A - Novel shaft bottom desilting device - Google Patents
Novel shaft bottom desilting device Download PDFInfo
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- CN112576211A CN112576211A CN202011603033.7A CN202011603033A CN112576211A CN 112576211 A CN112576211 A CN 112576211A CN 202011603033 A CN202011603033 A CN 202011603033A CN 112576211 A CN112576211 A CN 112576211A
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- connecting pipe
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 91
- 239000004576 sand Substances 0.000 claims abstract description 57
- 238000005452 bending Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 description 34
- 238000005406 washing Methods 0.000 description 29
- 239000010802 sludge Substances 0.000 description 21
- 238000004140 cleaning Methods 0.000 description 15
- 238000005553 drilling Methods 0.000 description 12
- 239000002002 slurry Substances 0.000 description 10
- 238000005086 pumping Methods 0.000 description 9
- 239000007788 liquid Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- 238000012360 testing method Methods 0.000 description 6
- 238000002347 injection Methods 0.000 description 5
- 239000007924 injection Substances 0.000 description 5
- 239000013049 sediment Substances 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 238000011010 flushing procedure Methods 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 239000002349 well water Substances 0.000 description 2
- 235000020681 well water Nutrition 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/12—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor using drilling pipes with plural fluid passages, e.g. closed circulation systems
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
The invention provides a novel shaft bottom dredging device. The novel well bottom dredging device comprises a submersible pump; the connecting pipe is arranged on the top side of the submersible pump and is connected with a water outlet of the submersible pump; the pump pipe is connected to the top side of the connecting pipe and communicated with the connecting pipe; two washed sand wet return, the washed sand wet return install on the connecting pipe, the washed sand wet return includes U type end, pipe and crooked nozzle of intaking, the top of pipe with the U type is intake the end and is connected, the port orientation of U type end of intaking the direction of immersible pump, the U type end of intaking extend to in the connecting pipe, the bottom of pipe with crooked nozzle is connected. The novel shaft bottom dredging device provided by the invention has the advantages of convenience in use, low cost, small occupied area, strong flexibility and wide applicability.
Description
Technical Field
The invention relates to the technical field of dredging equipment, in particular to a novel shaft bottom dredging device.
Background
In hydrogeological investigation and underground water exploration, a test well or a exploration combined well is implemented, a pumping test or a water injection test is carried out to obtain hydrogeological parameters, which is one of main working means of the hydrogeological survey and underground water exploration, and in order to obtain accurate parameters, a well washing-dredging-test process is needed after the test well is formed, wherein dredging is to clean sand, silt and other substances deposited at the bottom of the well after well washing, and the thickness of an effective water-bearing layer in the well is kept to obtain accurate stratum pumping and water injection capacity. The problem of bottom-hole siltation not only occurs in the well-flushing test process, but also occurs in the long-term water well pumping operation process, mud and sand in the stratum enter the well along with water flow, wherein part of the mud and sand returns out of the well mouth along with the water flow, and part of the mud and sand moves downwards under the action of gravity and sinks into the bottom of the well. If the liquid flow in the well can not bring the silt to the ground, the sedimentation is continuously generated in the well, the sand column is gradually increased, the aquifer at the lower part is buried, the seepage passage of the aquifer or the filter is blocked, and the flow resistance of the underground water is increased, so that the water yield of the water supply well is reduced, and the water supply efficiency can not be fully exerted. The problem of bottom hole silting is a common problem in the development and utilization of underground water, which is commonly existed in the built electromechanical well and seriously affects the normal water supply and the service life of the electromechanical well. How to better treat the siltation in the well, prolong the natural life of the motor-pumped well, give full play to the effects of the existing motor-pumped well, reduce the development and utilization cost of underground water, is an important problem generally concerned by vast hydrogeologists.
At present, common sludge cleaning methods at home and abroad comprise a sand bailing barrel sludge cleaning method, an air compressor washing sludge cleaning method, a slurry pump sludge cleaning method, a double-pump sludge cleaning method, a gas lift reverse circulation sludge cleaning method and the like, and the defects of the prior art are listed in sequence:
1. a silt removing method of a sand bailing cylinder:
the bailing barrel is made of a steel pipe with the diameter of 108-146 mm, and is processed into a lifting barrel with the length of 1.5-2.0 m, the upper part of the bailing barrel is connected with a lifting ring or a drill rod joint, and a sand inlet at the bottom of the bailing barrel is provided with a valve sand baffle (or a sand baffle ball) to form the bailing barrel.
The silt removing method of the sand bailing cylinder is the traditional gravity sand bailing. During operation, the upper part of the bailing cylinder is connected by a drill rod or a steel wire rope, and a sand inlet at the bottom is provided with a valve sand baffle. When dredging, the sand bailing cylinder is lowered down, and when the silt is deposited, the sand is repeatedly lifted and dropped to impact the silt, so that the silt body is stirred and enters the sand bailing cylinder. Then the bailing barrel is lifted out of the well, and accumulated sand in the pipe is poured out. And repeating the operation until the silt in the well is removed.
The method is simple to operate, but has a common dredging effect, and is not suitable for water supply wells with large well depth, more sand accumulation at the bottom of the well, serious sedimentation, instability of the wall of the well due to collapse and other large falling objects in the well.
2. Sludge pump sludge cleaning method:
the sludge pump is used for dredging by adopting a large-flow sludge pump. The drilling rod is connected in the well, a jet water gun is arranged at the foremost end of the bottom of the drilling rod, and the water gun nozzle contacts with the silt layer surface. And (4) starting a pump to pump water, ejecting the water through a spray gun, flushing silt sand, and flushing the silt sand out of the ground along with the upward water flow. The drilling tool continuously falls down to the bottom of the well along with the continuous pressing of the clean water into the well.
The method is suitable for water supply wells with smaller well diameter and shallower depth. For a water supply well with a large depth, due to the fact that the slurry circulation stroke is long, although a good sand carrying effect is achieved when slurry in the well returns upwards in the dredging operation, under the action of liquid column pressure, part of sand carried in the slurry enters the filter layer and the water-bearing layer through the filter pores again, the well washing effect is affected, and the water yield of the water supply well is reduced. Therefore, the larger the well depth or the larger the grain size of the sludge in the well, the more obvious the above effect is, so the method is suitable for dredging the water supply well with the shallow well depth.
3. Double pump sludge cleaning method
The principle of the double-pump dredging method is that one pump supplies water to the bottom of the well for sand washing, the other pump pumps water from the inside of the well to the outside for sand discharging, a high-pressure water gun is used for washing the silt in the well pipe and mixing with the water for pumping, and the process is repeated until the silt is discharged. The sand washing pump can be a high-lift clean water pump or a slurry pump, and the front end of the sand washing pipe is provided with a retractable conical nozzle which is tightly close to the deposition area. The sediment in the well is flushed by high-pressure jet flow generated by the submersible electric pump and is discharged out of the well mouth through the water suction pump. Along with the gradual reduction of the depth of the sediment in the hole, the water supply pipe is continuously deepened to reach the preset depth of the bottom of the well, so that the purpose of removing the sediment in the well is achieved.
In the method, because the pumped and drained well water contains a large amount of silt, the abrasion to the water pump and the shaft sleeve is serious, the motor of the water pump is easy to burn out, and the maintenance cost is high.
For a pipe well with a larger diameter and a deeper diameter, the double-pump dredging method is adopted, so that the effect is better, and the efficiency is higher. For a pipe well with a small well diameter and a large water inflow, the requirements on the pipe diameters of a pumping pipe and a water supply pipe cannot be too large, so that the pumping amount is limited, the amount of extracted silt is small, and the dredging efficiency is reduced.
The ground surface needs to prepare a large enough clean water pool, and the operation space is required to be large.
Along with the reduction of the deposit, the water pump pipe and the water injection pump pipe need to move down simultaneously, and the operation is more loaded down with trivial details.
4. An air compressor sludge cleaning method:
when the air compressor is used for dredging, the air supply pipe and the water outlet pipe are matched, namely, a steel pipe (4 inches) is put into a well, the distance between a bottom opening and a deposition surface is about 0.3m, the air supply pipe is inserted into the water outlet pipe (or is connected with the water outlet pipe), the bottom of the air pipe is connected with a water-gas mixer, the mixer is higher than the bottom opening of the steel pipe by about 3m, and a water-gas separation device is arranged at a water outlet of a well head. Compressed air is sent into the hole to fully mix water and gas, and well water enters the water outlet pipe through the bottom opening of the water outlet pipe and returns to the ground to be discharged under the action of atmospheric pressure because the specific gravity of the water-gas mixture is less than 1, so that sludge in the well is carried out of the well mouth. Along with the gradual reduction of the depth of the sediment in the hole, the water outlet pipe is continuously deepened to reach the preset depth of the bottom of the well, so that the purpose of removing the sediment in the well is achieved.
The air compressor desilting method is suitable for water supply wells with deep wells and well pipes. For a water supply well which is formed by an open hole or is not subjected to water stop at a shallow part, because the stability of the hole wall is poor or water return outside the pipe can occur, the sand blowing (or well washing) method of directly pumping the hole (directly putting an air pipe into the hole and using the hole wall as a water outlet pipe) is not suitable.
The air compressor desilting method has thorough well washing desilting, high efficiency, suitability for various well types, complex installation and maintenance, high well washing desilting cost and inapplicability to common shallow wells.
5. Gas lift reverse circulation dredging
The principle of air compressor well washing and dredging is basically the same, and sludge is discharged out of the well by pumping slurry in the well. The gas-lift reverse circulation method is characterized in that compressed air is sent to a gas-water mixer through a drilling tool, namely the compressed air is mixed with liquid in the drilling tool to form a gas-liquid mixture with the density smaller than that of the liquid in the well, and the gas-liquid mixture rises under the action of the pressure of a liquid column outside the drilling tool, so that the dredging effect is better. During operation, along with the continuous feeding of compressed air, the liquid in the well carries mud and sand to enter the drilling tool through the drill bit, so that the process of continuously pumping slurry, rock debris and sand powder in the well is formed. In addition, the operation of the method has no pollution and blockage to the water taking layer of the well, and the water outlet capacity of the well is ensured.
When the well depth is less than 50m, the gas lift reverse circulation drilling is not easy to realize or the drilling efficiency is very low. The drilling tool required by the gas lift reverse circulation drilling is complex and heavy. The gas lift reverse circulation has high cost and complex operation, namely, the condition of discharging slurry is observed to prevent and control the blockage of the drill bit and the inner hole of the drilling tool; and the air pressure of the air compressor and the water yield and air output of the water outlet are closely observed.
Therefore, there is a need to provide a new and new type of shaft bottom dredging device to solve the above technical problems.
Disclosure of Invention
The invention solves the technical problem of providing a novel shaft bottom dredging device which is convenient to use, low in cost, small in occupied area, strong in flexibility and wide in applicability.
In order to solve the technical problem, the novel shaft bottom dredging device provided by the invention comprises: the sand washing water return pipe is characterized by comprising a submersible pump, a connecting pipe, a sand washing water return pipe and a pump pipe, wherein one end of the sand washing water return pipe is a U-shaped water inlet end, the other end of the sand washing water return pipe is an inclined bent nozzle, the bending angle is 60-90 degrees, the cross section of the opening of the bent nozzle is flat, and the transverse width of the opening is 1/2-2/3 of the diameter of a round pipe of the bent nozzle. The connecting pipe is connected with the pump pipe for the immersible pump, opens 2 apertures in the side of connecting pipe, makes the U type of sand washing return water pipe advance water end card and go into the aperture and welded seal, and U type is advanced water port and is in the connecting pipe to towards the immersible pump direction, sand washing return water pipe nozzle end is located the connecting pipe outside, and sand washing return water pipe length is decided according to immersible pump length, is that the nozzle position is a little higher than the immersible pump bottom.
Compared with the related art, the novel well bottom dredging device provided by the invention has the following beneficial effects:
1. for the double-pump sludge cleaning method, the air compressor sludge cleaning method and the slurry pump sludge cleaning method, the cost is reduced, the device is simple to operate, and only the submersible pump needs to be slowly lowered.
2. The device occupies a small ground area, is equivalent to the area occupied when a pump is normally started, and does not need clear water injection.
3. The device has strong flexibility and wide applicability, is not limited by well depth and well diameter basically, only needs a submersible pump and a pump pipe which are matched with a well, and can adjust the size structures of the connecting pipe and the sand washing water return pipe according to the diameter of a well hole and the silt amount at the bottom of the well.
Drawings
FIG. 1 is a schematic structural view of a preferred embodiment of the novel downhole dredging device provided by the present invention.
Reference numbers in the figures: 1. the device comprises a submersible pump 11, a water inlet 2, a connecting pipe 3, a sand washing water return pipe 4 and a pump pipe.
Detailed Description
The invention is further described with reference to the following figures and embodiments.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a preferred embodiment of the novel downhole dredging device provided in the present invention. The novel shaft bottom dredging device comprises: the sand washing water return pipe comprises a submersible pump 1, a connecting pipe 2, a sand washing water return pipe 3 and a pump pipe 4, wherein one end of the sand washing water return pipe 3 is a U-shaped water inlet end, the other end of the sand washing water return pipe is an inclined bent nozzle, the bending angle is 60-90 degrees, the cross section of the opening of the bent nozzle is flat, and the transverse width of the opening is 1/2-2/3 of the diameter of a round pipe of the bent nozzle. Connecting pipe 2 is that immersible pump 1 is connected with pump line 4, opens two apertures in the side of connecting pipe 2, makes the U type of sand washing wet return block of intaking hold the card and go into the aperture and welded seal, and U type intake port is in the connecting pipe to towards the immersible pump direction, 3 nozzle ends of sand washing wet return are located the connecting pipe outside, and 3 lengths of sand washing wet return are decided according to immersible pump length, are that the nozzle position is a little higher than 1 bottoms of immersible pump.
The working principle of the novel shaft bottom dredging device provided by the invention is as follows:
the submersible pump 1 operates to pump underground water, the submersible pump 1 sends high-speed water flow to pass through the connecting pipe 2, most of the water flow enters the pump pipe 4 through the connecting pipe 2 and is pumped out of the ground surface, a small part of the high-speed water flow enters the sand washing water return pipe 3 through the U-shaped water inlet end in the pipe, the mud sand at the bottom of the well is impacted through the bent nozzle, the mud sand at the bottom of the well is lifted and suspended around the submersible pump 1, the mud sand enters the connecting pipe 2 and the pump pipe 4 through the water inlet of the submersible pump 1 under the action of the working suction force of the submersible pump 1 and is pumped out of the well along with the water flow, the circulation is repeated.
Compared with the related art, the novel well bottom dredging device provided by the invention has the following beneficial effects:
1. for the double-pump sludge cleaning method, the air compressor sludge cleaning method and the slurry pump sludge cleaning method, the cost is reduced, the device is simple to operate, and only the submersible pump needs to be slowly lowered.
2. The device occupies a small ground area, is equivalent to the area occupied when a pump is normally started, and does not need clear water injection.
3. The device has strong flexibility and wide applicability, is not limited by well depth and well diameter basically, only needs a submersible pump and a pump pipe which are matched with a well, and can adjust the size structures of the connecting pipe and the sand washing water return pipe according to the diameter of a well hole and the silt amount at the bottom of the well.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (4)
1. A novel shaft bottom dredging device is characterized by comprising:
a submersible pump;
the connecting pipe is arranged on the top side of the submersible pump and is connected with a water outlet of the submersible pump;
the pump pipe is connected to the top side of the connecting pipe and communicated with the connecting pipe;
two washed sand wet return, the washed sand wet return install on the connecting pipe, the washed sand wet return includes U type end, pipe and crooked nozzle of intaking, the top of pipe with the U type is intake the end and is connected, the port orientation of U type end of intaking the direction of immersible pump, the U type end of intaking extend to in the connecting pipe, the bottom of pipe with crooked nozzle is connected.
2. A novel shaft bottom dredging device as claimed in claim 1, wherein the bending angle of the bending nozzle is 60 ° to 90 °.
3. The novel downhole dredging device as claimed in claim 1, wherein the curved nozzle is flat in cross-sectional shape and has a transverse width 1/2-2/3 of the diameter of the round pipe.
4. The novel downhole dredging device of claim 1, wherein the bent nozzle is positioned higher than the submersible pump bottom.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011603033.7A CN112576211A (en) | 2020-12-29 | 2020-12-29 | Novel shaft bottom desilting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011603033.7A CN112576211A (en) | 2020-12-29 | 2020-12-29 | Novel shaft bottom desilting device |
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| Publication Number | Publication Date |
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| CN112576211A true CN112576211A (en) | 2021-03-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011603033.7A Pending CN112576211A (en) | 2020-12-29 | 2020-12-29 | Novel shaft bottom desilting device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114941510A (en) * | 2022-06-17 | 2022-08-26 | 程显达 | Circulation unblocking sand fishing process system |
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2020
- 2020-12-29 CN CN202011603033.7A patent/CN112576211A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114941510A (en) * | 2022-06-17 | 2022-08-26 | 程显达 | Circulation unblocking sand fishing process system |
| CN114941510B (en) * | 2022-06-17 | 2024-03-22 | 盘锦博瑞石油工程有限公司 | Circulating blocking-removing sand-fishing process system |
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