CN106246142B - A kind of geothermal well based on complicated ground stratum - Google Patents
A kind of geothermal well based on complicated ground stratum Download PDFInfo
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- CN106246142B CN106246142B CN201610772574.XA CN201610772574A CN106246142B CN 106246142 B CN106246142 B CN 106246142B CN 201610772574 A CN201610772574 A CN 201610772574A CN 106246142 B CN106246142 B CN 106246142B
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 15
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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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
-
- 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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
-
- 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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
-
- 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
- E21B36/00—Heating, cooling or insulating arrangements for boreholes or wells, e.g. for use in permafrost zones
- E21B36/003—Insulating arrangements
-
- 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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/02—Subsoil filtering
- E21B43/04—Gravelling of wells
-
- 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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/02—Subsoil filtering
- E21B43/08—Screens or liners
-
- 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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/02—Subsoil filtering
- E21B43/08—Screens or liners
- E21B43/084—Screens comprising woven materials, e.g. mesh or cloth
-
- 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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/02—Subsoil filtering
- E21B43/08—Screens or liners
- E21B43/088—Wire screens
Landscapes
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Mechanical Engineering (AREA)
- Filtering Materials (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The present invention provides a kind of geothermal wells based on complicated ground stratum, including the well cementation section and filter well section arranged from top to bottom, and the well cementation section includes 15 meters of long wall casings, and cement mortar recharge is used between the wall casing and well bore；The filter well section includes 30 meters of long water-permeable pipes, filter is equipped between the water-permeable pipe and well bore, and a diameter of 13 centimetres of cobble is filled between water-permeable pipe and well bore.In the present invention, filter can obstruct the silt in underground water between water-permeable pipe and well bore, prevent silt from entering in geothermal well, improve the quality at water source in geothermal well, and a diameter of 13 centimetres of cobble is filled between water-permeable pipe and well bore, to be further ensured that the stability of filter well section, simultaneously because filler is identical as the main component of geology residing for filter well section, the circulation of underground water is not interfered with.
Description
Technical field
The present invention relates to geothermal well technical fields, and in particular to a kind of geothermal well based on complicated ground stratum.
Background technology
Underground heat is a kind of energy resource generated from earth interior nuclear fusion, and geothermal energy is a kind of clean energy resource and can be again
The raw energy, is widely used, development prospect is very wide in terms of heating and refrigerating.
It is the committed step utilized to geothermal energy resources to build geothermal well, for different geology, the casing programme of geothermal well
It is not quite similar.For the geothermal well on complicated ground stratum, such as upper layer is silty clay, and lower layer is the geology knot of boulder bed
Structure, wherein farinose argillic horizon are yellowish-brown, and part presss from both sides silt, flour sand and mud, opposite water proof；The ingredient of boulder bed be sandstone,
Quartzite and flint etc., each ingredient mix distribution, filling of meeting each other, and water is abundant, is good aquifer water-bearing stratum, but the boulder bed
In be mingled with cohesive soil and fine sand, increase the difficulty to underground water filtering, therefore, the ground built on such complicated ground stratum
The filtering function of hot well is particularly critical, is entered in geothermal well with a large amount of cohesive soils and fine sand that prevent water-bearing layer, leads to hoistway
Silt up, influences the normal use of geothermal well.
Invention content
For the defects in the prior art, the present invention provides a kind of geothermal well based on complicated ground stratum, to improve ground
The quality at water source in hot well, while keeping the temperature at water source in geothermal well.
A kind of geothermal well based on complicated ground stratum provided by the invention, including the well cementation section and mistake that arrange from top to bottom
Filter well section, the well cementation section includes 15 meters of long wall casings, and cement mortar recharge is used between the wall casing and well bore；It is described
Filter well section includes 30 meters of long water-permeable pipes, filter is equipped between the water-permeable pipe and well bore, and in water-permeable pipe and well bore
Between fill a diameter of 1-3 centimetres of cobble.
In the present invention, geothermal well is followed successively by well cementation section and filter well section from top to bottom, and geothermal well builds the ground of position
Matter structure is divided into 10 meters of farinose argillic horizon and 35 meters of boulder bed from top to bottom, due to the structure pine of farinose argillic horizon
It dissipates, and water content is few, therefore in order to ensure the stability of casing programme, and prevents cold water from entering in geothermal well, will consolidate
Well section depth is set to 15 meters, and is reinforced by the way of 15 meters of long wall casings and recharge cement mortar；Due to boulder bed
Water content is abundant, therefore the filter well section for being 30 meters in boulder bed setting depth, is reinforced using 30 meters long of water-permeable pipes, due to
It is mingled with cohesive soil and fine sand in the boulder bed, therefore filter is set between water-permeable pipe and well bore, it will be in underground water
Silt obstructs between water-permeable pipe and well bore, prevents silt from entering in geothermal well, improves the quality at water source in geothermal well, and
The cobble that a diameter of 1-3 centimetres is filled between water-permeable pipe and well bore, to be further ensured that the stability of filter well section, while by
It is identical as the main component of geology residing for filter well section in filler, do not interfere with the circulation of underground water.
Preferably, the wall casing includes outer wall casing and interior wall casing, and the interior wall casing passes through fixing bracket and institute
Outer wall casing connection is stated, insulating layer is provided between the outer wall casing and interior wall casing.Since well cementation section is in the upper of well bore
Side, the temperature on the stratum is relatively low, and the water source in geothermal well, which touches wall casing, will lead to heat loss, therefore, in well cementation section
Place's setting insulating layer can effectively prevent the loss of water source heat in geothermal well.
Preferably, the insulating layer is polyurethane foaming layer.Using foaming technique between outer wall casing and interior wall casing shape
At polyurethane insulation coating there is good heat insulation effect, disclosure satisfy that prolonged heat preservation demand, and polyurethane material has
There are good wearability, resistance to ag(e)ing and adhesiveness, can be adapted for the use environment of geothermal well.
Preferably, the inner surface of the outer wall casing is provided with infrared-reflecting coated.Outer borehole wall pipe internal surface setting
Infrared reflection coating can reflect the infrared ray of polyurethane insulation coating, reduce the diffusion of polyurethane insulation coating heat, carry
High heat insulation effect.
Preferably, the outer surface of the interior wall casing is provided with solar energy heat absorbing coating.Since interior wall casing is in direct contact
Water source in geothermal well causes its outer surface to have higher temperature, and solar energy heat absorbing coating can preferably absorb infrared ray, from
And a heat build-up layer is formed in the outer surface of interior wall casing, the heat for reducing interior wall casing overflows, and further improves heat preservation effect
Fruit.
Preferably, the interior wall casing and outer wall casing are stainless steel.Using the interior wall casing of stainless steel
The intensity that casing programme can be improved with outer wall casing, prevents well bore from caving in, and stainless steel is with preferable corrosion-resistant
Property, it can be adapted for water source environment complicated in geothermal well, extend the service life of geothermal well.
Preferably, the inner surface of the interior wall casing is provided with corrosion-inhibiting coating.Since the environment of underground generally all compares evil
Bad, the corrosivity at the water source in geothermal well is stronger, and corrosion-inhibiting coating is arranged in the inner surface of interior wall casing, can be protected to it
Shield, extends its service life.
Preferably, the filter includes first level filtering device and two-stage filter, the two-stage filter setting
In in the first level filtering device；The first level filtering device includes base pipe, protection block reinforcement and packet net, and the base pipe is circle
It manages, permeable hole has been evenly arranged on the basis tube wall, the protection block reinforcement is vertically welded in basic pipe outer wall, protection gear
Muscle is equally spaced, and the packet net is wrapped in protection block reinforcement and basic pipe outer wall, and the range that packet net vertically wraps up is more than protection
The range of block reinforcement, packet net external application iron wire are fastened in protection block reinforcement and basic pipe outer wall；The two-stage filter includes
Inner tube, outer tube, partition board and filter core, said inner tube and outer tube are pipe, and inner and outer tubes are coaxially disposed, on outer tube wall uniformly
Be disposed with permeable hole, outer tube top is provided with hanging ring, and described partition board one end is fixedly connected with outer wall of inner tube, the partition board other end with it is outer
Inside pipe wall is fixedly connected, and partition board will be divided into multiple chambers between inner tube and outer tube, and the filter core is filled in the cavity, chamber
Room upper and lower side is opening, for the water after filter element filtering to be discharged；The outer tube top is provided with the outer of outwardly projecting annular
Pipe excrescence, the base pipe is provided on the base pipe of inwardly projecting annular excrescence under excrescence and base pipe, described
Outer tube is passed down through excrescence inner circle on the base pipe, and outer tube excrescence is pressed on base pipe on excrescence, outer pipe bottom pressure
Under the base pipe on excrescence, rubber cushion, the base pipe are lined on the base pipe between excrescence and outer tube excrescence
It is lower that rubber cushion is lined between excrescence and outer pipe bottom.
Filter in the present invention includes first level filtering device and two-stage filter.Wherein first level filtering device is to silt
Coarse filtration is carried out, is mainly used for filtering out the sand of bulky grain, permeable hole has been evenly arranged on basic tube wall, packet net is wrapped in pipe
Outside, underground water will enter in geothermal well, first have to two layers of filtering of permeable hole by packet net and base pipe, filter out bulky grain
Sand.Two-stage filter carries out refined filtration to silt, is mainly used for filtering out tiny silt, two-stage filter includes interior
Pipe, outer tube, partition board and filter core, inner tube is coaxially arranged with outside, and partition board is the connecting framework of inner tube and outer tube, at the same by inner tube with
Space between outer tube is divided into multiple cavities, fills filter core in cavity, design in this way, makes the entire two-stage filter be
One entirety, sound construction；Two-stage filter is mainly by two layers of the filter core being located in the permeable hole and chamber on outer tube wall
Permeable hole is not arranged for filtering, inner pipe wall, and chamber upper and lower end is opening, after underground water enters chamber, is flowed above and below along chamber,
It is discharged from chamber upper and lower end, design in this way extends flow path of the underground water in filter core, improves filtering effect
Fruit.First level filtering device filter opening is larger, is not easy to plug, and can filter out bulky grain sand, and two-stage filter filter opening is small, is easy stifled
Plug, can filter out tiny silt, by the way of this classified filtering, can more thoroughly filter out sand and reduce
The probability that filter blocks.Outer tube is passed down through excrescence inner circle on base pipe, and outer tube excrescence is pressed on base pipe on excrescence,
Outer pipe bottom is pressed under base pipe on excrescence, and two-stage filter and first level filtering device is made to be combined together, and they
Between be lined with rubber cushion, rubber cushion is compacted by the dead weight of two-stage filter, sealing effect is good, and silt will not be flowed out from gap.
Two-stage filter is integral design, can be detached easily with excrescence under excrescence on base pipe and base pipe, can be by setting
Set the hanging ring at outer tube top end two-stage filter integrally hung out into geothermal well and cleaned, repaired or replaced, clean, repair or
Two-stage filter is hung in geothermal well again after replacement, is used in combination with first level filtering device, thus can be extended
The service life of filter further improves the quality at water source in geothermal well.
Preferably, the filter core is stainless steel filter core, is provided on the outer wall and partition board of said inner tube outwardly projecting solid
Determine part, the fixing piece is for fixing the stainless steel filter core；The cross-sectional area of each chamber is equal.Stainless steel filter core has
There is a good strainability, filtered underground water can meet system requirement, corrosion resistance, heat resistance, resistance to pressure, wear-resisting
Property is good, can meet severe underground environment, and core stomata is uniform, accurate filtering accuracy, and the flow of unit area is big, can improve
The efficiency of refined filtration improves filter efficiency, can be reused after cleaning, free of replacement, economizes on resources, reduces cost；Through coarse filtration
Underground water afterwards flows above and below after the permeable hole of outer tube enters chamber, along chamber, is discharged through chamber opening, and filter core is easy hair
Raw displacement, conglomeration, fixing piece play fixed function to stainless steel filter core, and when filtering, the flowing of water will not be such that filter core is subjected to displacement, filter
Core will not conglomeration improve filter effect to ensure that the normal work of filter core；And the cross-sectional area of each chamber is equal, into
The water for going out chamber is uniform, can further promote the effect and efficiency of filtering.
Preferably, the permeable hole of the base pipe is strip-shaped hole, and the strip-shaped hole of the upper and lower adjacent two rows mutually staggers.
Using strip-shaped hole, coarse filtration requirement can be met, upper and lower adjacent two rows mutually stagger, and so that permeable hole is more evenly distributed, filtering enters base
The underground water of plinth pipe also evenly, can further promote the effect and efficiency of filtering.
Preferably, in order to optimize structure, the protection block reinforcement uses antirust round steel, a diameter of 4mm of round steel, between round steel
Away from for 20mm.
Preferably, the packet net is nylon yarn packet net.Nylon yarn packet net can filter out the sand of bulky grain, reach coarse filtration
It is required that.
Preferably, the iron wire uses galvanized wire, and it is 10mm that iron wire, which winds spacing,.Using galvanized wire, prevent from winding
Iron wire be broken because being corroded, cause packet net to fall off, while in order to optimize structure, it is 10mm that iron wire, which winds spacing,.
Preferably, the permeable hole of the outer tube is round hole, and left and right two row of round hole mutually stagger.Using circle
Hole can meet the requirement of refined filtration, and left and right adjacent two row mutually stagger, and so that permeable hole is more evenly distributed, into the underground water of chamber
Also evenly, the effect and efficiency of filtering are promoted.
Preferably, the discharge area of the permeable hole of the base pipe is more than the discharge area of the permeable hole of the outer tube.Base
The discharge area of the permeable hole of plinth pipe is more than the discharge area of the permeable hole of outer tube, can guarantee that coarse filtration provides enough water for refined filtration
Amount promotes filter efficiency.
Preferably, the surface of the base pipe surfaces externally and internally, the surfaces externally and internally of inner tube, the surfaces externally and internally of outer tube and permeable hole
It is coated with corrosion-resistant coating.The environment of underground is generally all relatively more severe, and corrosivity is stronger, in base pipe surfaces externally and internally, inner tube
These parts being in direct contact with underground water or soil of the surface of outer surface, the surfaces externally and internally of outer tube and permeable hole apply one layer of anti-corrosion
Layer is lost, the corrosion of filter component can be reduced, prolonged the service life.
Description of the drawings
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art
Embodiment or attached drawing needed to be used in the description of the prior art are briefly described.In all the appended drawings, similar element
Or part is generally identified by similar reference numeral.In attached drawing, each element or part might not be drawn according to actual ratio.
Fig. 1 is a kind of structural schematic diagram of the geothermal well based on complicated ground stratum of the present invention；
Fig. 2 is a kind of structural schematic diagram of the wall casing of the geothermal well based on complicated ground stratum of the present invention；
Fig. 3 is a kind of sectional structure signal of filter of the geothermal well based on complicated ground stratum of the present invention
Figure；
Fig. 4 is the A-A sectional views of Fig. 3；
Fig. 5 is the B-B sectional views of Fig. 3；
Fig. 6 is the C-C sectional views of Fig. 3；
Fig. 7 is a kind of base pipe of the filter of the geothermal well based on complicated ground stratum of the present invention and two level mistake
Filter the structural schematic diagram that device combines；
Fig. 8 is a kind of two-stage filter of the filter of the geothermal well based on complicated ground stratum of the present invention
Structural schematic diagram.
Reference numeral：
1- wall casings；2- water-permeable pipes；3- filters；
The outer wall casings of 11-；Wall casing in 12-；13- fixing brackets；14- polyurethane insulation coatings；15- infrared reflections apply
Layer；16- solar energy heat absorbing coatings；31- base pipes；32- protects block reinforcement；33- packet nets；34- iron wires；35- outer tubes；36- inner tubes；
37- chambers；38- partition boards；39- permeable holes；
Excrescence on 311- base pipes；Excrescence under 312- base pipes；351- outer tube excrescences；352- hanging rings；361- is solid
Determine part.
Specific implementation mode
The embodiment of technical solution of the present invention is described in detail below in conjunction with attached drawing.Following embodiment is only used for
Clearly illustrate technical scheme of the present invention, therefore be only used as example, and the protection model of the present invention cannot be limited with this
It encloses.
As shown in Figure 1, the main component of the geologic structure of geothermal well construction position is followed successively by from top to bottom in the present embodiment
10 meters of farinose argillic horizon and 35 meters of boulder bed, wherein farinose argillic horizon it is loosely organized, water content is few, and boulder bed contains
Water is abundant, but is mingled with cohesive soil and fine sand in the boulder bed；Therefore, in order to ensure the stability and underground heat of casing programme
A kind of quality in well water source, geothermal well based on complicated ground stratum provided in an embodiment of the present invention, is followed successively by from top to bottom
Section of cementing the well and filter well section correspondingly use 15 meters long of wall casing 1 to reinforce, in 1 He of wall casing wherein well cementation section is 15 meters
Cement mortar recharge is used between well bore, to improve the stability of geothermal well；Filter well section is 30 meters, is correspondingly used 30 meters long
Water-permeable pipe 2 reinforce, filter 3 is equipped between water-permeable pipe 2 and well bore, and fill between water-permeable pipe 2 and well bore a diameter of
1-3 centimetres of cobble further consolidates the stability of casing programme, and the underground water in boulder bed is via filter 3 from water-permeable pipe 2
On hole in be flowed into geothermal well, filtered quality of groundwater is improved, and the content of silt is greatly decreased in water, can
Meet subsequently to the utilization demand at the water source in geothermal well, ensure that the quality at water source in geothermal well.
As shown in Fig. 2, the wall casing 1 includes outer wall casing 11 and interior wall casing 12, which passes through fixation
Holder 13 is connect with outer wall casing 11, and the polyurethane heat-insulation that foaming is formed is provided between outer wall casing 11 and interior wall casing 12
Layer 14, since well cementation section is in the top of well bore, the temperature on the stratum is relatively low, and the water source in geothermal well touches interior wall casing 12
It will lead to heat loss, therefore, setting insulating layer can effectively prevent the loss of water source heat in geothermal well at well cementation section；Institute
The inner surface for stating outer wall casing 11 is equipped with infrared-reflecting coated 15, this infrared-reflecting coated 15 is with thermoset resin material
For film formation at low temp substance, using low melting point and the special crown glass binder of low-expansion coefficient as high temperature bonding material, through special work
Skill processing is prepared a kind of having infrared external reflection function, the strong and nontoxic and pollution-free organo-mineral complexing of high temperature resistant, caking property
Coating can reflect the infrared ray of polyurethane insulation coating 14, reduce the diffusion of 14 heat of polyurethane insulation coating, improve and protect
Temp effect；Since interior wall casing 12 is in direct contact the water source in geothermal well, its outer surface is caused to have higher temperature, therefore in institute
The outer surface for stating interior wall casing 12 is equipped with solar energy heat absorbing coating 16, can preferably absorb infrared ray, in interior wall casing
12 outer surface forms a heat build-up layer, and the heat for reducing interior wall casing 12 overflows, and further improves heat insulation effect, the sun
Energy heat absorbing coating 16 is the anodized coating of steel, has the characteristics that humidity, the use environment being suitable in geothermal well.
Above-mentioned outer wall casing 11 and interior wall casing 12 are stainless steel, can improve the intensity of casing programme, prevent
Well bore caves in, and stainless steel has preferable corrosion resistance, can be adapted for water source environment complicated in geothermal well, prolongs
The service life of long geothermal well
Further, since the environment of underground is generally all relatively more severe, the corrosivity at the water source in geothermal well is stronger, therefore upper
The inner surface for stating interior wall casing 12 is provided with corrosion-inhibiting coating, further to be protected to it, extends its service life.This implementation
The corrosion-inhibiting coating that example uses is using polyurethane modified epoxy resin as substrate, with mica iron oxide red for main color stuffing, to not
Rust steel surface has stronger adhesive force, can for a long time work and not fall off under the environment of geothermal well humidity.
As shown in fig. 3 to 7, the filter includes first level filtering device and two-stage filter, two-stage filter setting
In in first level filtering device；First level filtering device includes circular base pipe 31, protection block reinforcement 32 and packet net 33, and base pipe 31 is managed
Permeable hole 39 is evenly arranged on wall, permeable hole 39 is strip-shaped hole, and upper and lower adjacent two rows mutually stagger, and protection block reinforcement 32 uses
The antirust round steel of a diameter of 4mm is vertically welded on 31 outer wall of base pipe, its spacing 20mm, and packet net 33 is nylon yarn packet net
33, it is wrapped on protection block reinforcement 32 and 31 outer wall of base pipe, the range that packet net 33 vertically wraps up is more than the range of protection block reinforcement 32,
33 external application galvanized wire 34 of packet net is fastened with 10mm spacing in protection block reinforcement 32 and 31 outer wall of base pipe；Secondary filtration fills
It sets including inner tube 36, outer tube 35, partition board 38 and filter core, inner tube 36 and outer tube 35 are pipe, and inner tube 36 and outer tube 35 are coaxially set
It sets, permeable hole 39 has been evenly arranged on 35 tube wall of outer tube, permeable hole 39 is round hole, and left and right two row mutually stagger, base pipe
The discharge area of permeable hole 39 is more than the discharge area of the permeable hole 39 of outer tube, the setting of 35 top of outer tube there are four hanging ring 352, every
38 one end of plate is fixedly connected with 36 outer wall of inner tube, and 38 other end of partition board is fixedly connected with 35 inner wall of outer tube, and partition board 38 is by inner tube 36
The equal chamber 37 of multiple cross-sectional areas is divided between outer tube 35, filter core uses stainless steel filter core, is filled in chamber 37,
37 upper and lower side of chamber is opening, for the water after filter element filtering to be discharged, is provided on the outer wall and partition board 38 of inner tube 36 outward
Fixing piece 361 outstanding, fixing piece 361 for fixing stainless steel filter core, 31 surfaces externally and internally of base pipe, inner tube 36 interior appearance
The surface in face, the surfaces externally and internally of outer tube 35 and permeable hole 39 is coated with corrosion-resistant coating；35 top of outer tube is provided with outwardly projecting
Annular outer tube excrescence 351, base pipe 31 are provided on inwardly projecting ring foundation pipe and are protruded under excrescence 311 and base pipe
Body 312, outer tube 35 are passed down through 311 inner circle of excrescence on base pipe, and outer tube excrescence 351 is pressed in excrescence 311 on base pipe
On, 35 bottom of outer tube is pressed under base pipe on excrescence 312, is lined between excrescence 311 and outer tube excrescence 351 on base pipe
Rubber cushion is lined with rubber cushion under base pipe between 35 bottom of excrescence 312 and outer tube.
Wherein first level filtering device carries out coarse filtration to silt, is mainly used for filtering out the sand of bulky grain；Base pipe 31 is managed
Bar shaped permeable hole 39 has been evenly arranged on wall, upper and lower adjacent two rows mutually stagger, and permeable hole 39 is made to be more evenly distributed, filter into
Enter the underground water of base pipe 31 also evenly, nylon yarn packet net 33 is wrapped in outside pipe by protecting 32 pad of block reinforcement, uses galvanized iron
Silk 34 is fixed, and underground water will enter in geothermal well, first have to two layers of mistake of permeable hole 39 by nylon yarn packet net 33 and base pipe
Filter, filters out the sand of bulky grain.Two-stage filter carries out refined filtration to silt, is mainly used for filtering out tiny silt, and two
Grade filter device includes inner tube 36, outer tube 35, partition board 38 and filter core, and inner tube 36 and outer tube 35 are coaxially arranged, and partition board 38 is inner tube
36 with the connecting framework of outer tube 35, while the space between inner tube 36 and outer tube 35 is divided into the equal chamber of multiple cross-sectional areas
37, segmentation filtering in this way, 37 water of each chamber is uniform, can promote the effect and efficiency of filtering, be filled not in chamber 37
Become rusty steel filter core, design in this way, and it is an entirety, sound construction to make entire two-stage filter；Meanwhile stainless steel filter core
With good strainability, filtered underground water can meet system requirement, corrosion resistance, heat resistance, resistance to pressure, resistance to
Mill property is good, can meet severe underground environment, and core stomata is uniform, accurate filtering accuracy, and the flow of unit area is big, can carry
The efficiency of high refined filtration meets system water demand, can be reused after cleaning, free of replacement, economizes on resources, reduces cost；
Two-stage filter is mainly by two layers of filtering of filter core in the permeable hole 39 and chamber 37 being located on 35 tube wall of outer tube, permeable hole 39
Upper and lower adjacent two row mutually stagger, and permeable hole 39 is made to be more evenly distributed, into chamber 37 underground water also evenly；Base pipe
Permeable hole 39 discharge area be more than outer tube permeable hole 39 discharge area, can guarantee that coarse filtration provides enough water for refined filtration
Amount promotes filter efficiency；Permeable hole 39 is not arranged for inner tube 36, and 37 upper and lower end of chamber is open, after underground water enters chamber 37, to
37 both ends of chamber are flowed, and are discharged from 37 upper and lower end of chamber, and design in this way extends flowing of the underground water in filter core
Path improves filter effect, and since in filter process, filter core is easy to happen displacement, conglomeration, fixing piece 361 filters stainless steel
Core plays fixed function, and when filtering, the flowing of water will not be such that filter core is subjected to displacement, filter core will not conglomeration, to ensure that filter core
Normal work, improves filter effect；The environment of underground is generally all relatively more severe, and corrosivity is stronger, the appearance in base pipe 31
Face, the surfaces externally and internally of inner tube 36, the surfaces externally and internally of outer tube 35 and permeable hole 39 surface these directly connect with underground water or soil
Tactile part applies one layer of corrosion-resistant coating, can reduce the corrosion of filter component, prolong the service life.
First level filtering device filter opening is larger, is not easy to plug, and can filter out bulky grain sand, and two-stage filter filter opening is small,
Be easy block, tiny silt can be filtered out, by the way of this classified filtering, can more thoroughly filter out sand and
Reduce the probability of plugged filter.
Outer tube 35 is passed down through 311 inner circle of excrescence on base pipe, and outer tube excrescence 351 is pressed in excrescence on base pipe
On 311,35 bottom of outer tube is pressed under base pipe on excrescence 312, by this dismountable mode by two-stage filter and
First level filtering device is combined together, and in combination with rubber cushion is lined between position, is compacted by the dead weight of two-stage filter
Rubber cushion, sealing effect is good, and silt will not be flowed out from gap；Two-stage filter and first level filtering device detachably detach, can be with
Two-stage filter is integrally lifted cleaning, repair or replacement, cleaning, repair by the hanging ring 352 being arranged by 35 top of outer tube
Or again hang in two-stage filter in geothermal well after replacing, it is used in combination with first level filtering device, to improve
The quality at water source in geothermal well.
Filter described in the present embodiment draw water it is different with the method for operation in recharge, it is specific as follows：
When drawing water, first level filtering device and two-stage filter collective effect are needed, secondary protection device is hung in into underground heat
In well, outer tube 5 is passed down through 311 inner circle of excrescence on base pipe, and outer tube excrescence 351 is pressed on base pipe on excrescence 311,
It is fitted together with first level filtering device, the underground water containing silt flows through nylon yarn packet net 33, through the bar shaped on base pipe 31
Permeable hole 39 enters in geothermal well, completes the level-one of silt by the filtering of nylon yarn packet net 33 and bar shaped permeable hole 39 outside well
Filtering；Underground water after coarse filtration enters chamber 37 through the round permeable hole on outer tube 35, the refined filtration through stainless steel filter core, from
The upper and lower open discharge of chamber 37, completes the secondary filtration of silt, to obtain the underground water source for meeting production requirement.
Recharge is that the water source after utilization is gone back to underground through underground heat well irrigation to need two level to reduce the resistance of recharge
Filter device is integrally hung out outside well, and recharge water is flowed out through the bar shaped permeable hole 39 on base pipe 31, then penetrates nylon yarn packet net
33 flow back into underground, with draw water filtering when flow direction on the contrary, play the role of cleaning to first level filtering device, prevent filter opening stifled
Plug, meanwhile, after two-stage filter is hung out, it can be cleaned, repaired or be maintained.
Finally it should be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
Present invention has been described in detail with reference to the aforementioned embodiments, it will be understood by those of ordinary skill in the art that：It still may be used
To modify to the technical solution recorded in previous embodiment, either which part or all technical features are equal
It replaces；And these modifications or replacements, the model for technical solution of the embodiment of the present invention that it does not separate the essence of the corresponding technical solution
It encloses, should all cover in the claim of the present invention and the range of specification.
Claims (7)
1. a kind of geothermal well based on complicated ground stratum, including the well cementation section and filter well section that arrange from top to bottom, it is special
Sign is：
The well cementation section includes 15 meters of long wall casings, and cement mortar recharge is used between the wall casing and well bore；
The filter well section includes 30 meters of long water-permeable pipes, filter is equipped between the water-permeable pipe and well bore, and permeable
A diameter of 1-3 centimetres of cobble is filled between pipe and well bore；
The filter includes first level filtering device and two-stage filter, and the two-stage filter is set to the level-one mistake
It filters in device；
The first level filtering device includes base pipe, protection block reinforcement and packet net, and the base pipe is pipe, the basis tube wall
On be evenly arranged permeable hole, the protection block reinforcement is vertically welded in basic pipe outer wall, protection block reinforcement be equally spaced, it is described
Packet net is wrapped in protection block reinforcement and basic pipe outer wall, and the range that packet net vertically wraps up is more than the range of protection block reinforcement, and packet net is outer
It is fastened in protection block reinforcement and basic pipe outer wall with iron wire；
The two-stage filter includes inner tube, outer tube, partition board and filter core, and said inner tube and outer tube are pipe, inner tube and outer
Pipe is coaxially disposed, and has been evenly arranged permeable hole on outer tube wall, and outer tube top is provided with hanging ring, described partition board one end with outside inner tube
Wall is fixedly connected, and the partition board other end is fixedly connected with outer tube wall, and partition board will be divided into multiple chambers, institute between inner tube and outer tube
State filter core filling in the cavity, chamber upper and lower side is opening, for the water after filter element filtering to be discharged；The outer tube top
It is provided with the outer tube excrescence of outwardly projecting annular, the base pipe is provided with prominent on the base pipe of inwardly projecting annular
Excrescence under body and base pipe, the outer tube are passed down through excrescence inner circle on the base pipe, and outer tube excrescence is pressed in basis
On pipe on excrescence, outer pipe bottom is pressed under the base pipe on excrescence, excrescence and outer tube excrescence on the base pipe
Between be lined with rubber cushion, rubber cushion is lined between excrescence and outer pipe bottom under the base pipe；
The filter core is stainless steel filter core, and outwardly projecting fixing piece is provided on the outer wall and partition board of said inner tube, described solid
Part is determined for fixing the stainless steel filter core；The cross-sectional area of each chamber is equal；
The permeable hole of the base pipe is strip-shaped hole, and the strip-shaped hole of upper and lower adjacent two rows mutually staggers.
2. a kind of geothermal well based on complicated ground stratum according to claim 1, it is characterised in that：
The wall casing includes outer wall casing and interior wall casing, and the interior wall casing is connected by fixing bracket and the outer wall casing
It connects, insulating layer is provided between the outer wall casing and interior wall casing.
3. a kind of geothermal well based on complicated ground stratum according to claim 2, it is characterised in that：
The insulating layer is polyurethane foaming layer.
4. a kind of geothermal well based on complicated ground stratum according to claim 2, it is characterised in that：
The inner surface of the outer wall casing is provided with infrared-reflecting coated.
5. a kind of geothermal well based on complicated ground stratum according to claim 4, it is characterised in that：
The outer surface of the interior wall casing is provided with solar energy heat absorbing coating.
6. a kind of geothermal well based on complicated ground stratum according to claim 2, it is characterised in that：
The interior wall casing and outer wall casing are stainless steel.
7. a kind of geothermal well based on complicated ground stratum according to claim 6, it is characterised in that：
The inner surface of the interior wall casing is provided with corrosion-inhibiting coating.
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| CA3044153C (en) | 2018-07-04 | 2020-09-15 | Eavor Technologies Inc. | Method for forming high efficiency geothermal wellbores |
| CN108979599A (en) * | 2018-09-20 | 2018-12-11 | 克拉玛依胜利高原机械有限公司 | A kind of slot pipe |
| CN111894531B (en) * | 2020-06-24 | 2021-03-23 | 中国地质科学院水文地质环境地质研究所 | Self-cleaning water filtering sieve pore well pipe with rotational flow jet orifice suitable for middle-deep geothermal heat |
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