CN106194124B - Geothermal well based on Bedrock Geology - Google Patents

Geothermal well based on Bedrock Geology Download PDF

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Publication number
CN106194124B
CN106194124B CN201610773120.4A CN201610773120A CN106194124B CN 106194124 B CN106194124 B CN 106194124B CN 201610773120 A CN201610773120 A CN 201610773120A CN 106194124 B CN106194124 B CN 106194124B
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well
tube
filter
casing
pipe
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CN201610773120.4A
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CN106194124A (en
Inventor
刘艺辉
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Hunan Zhongda Jingwei Geothermal Development Science And Technology Co Ltd
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Hunan Zhongda Jingwei Geothermal Development Science And Technology Co Ltd
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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B33/00Sealing or packing boreholes or wells
    • E21B33/10Sealing or packing boreholes or wells in the borehole
    • E21B33/13Methods or devices for cementing, for plugging holes, crevices, or the like
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B36/00Heating, cooling, insulating arrangements for boreholes or wells, e.g. for use in permafrost zones
    • E21B36/003Insulating arrangements
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/34Arrangements for separating materials produced by the well
    • E21B43/38Arrangements for separating materials produced by the well in the well

Abstract

The present invention provides a kind of geothermal wells based on Bedrock Geology, including the well cementation section and filter well section arranged from top to bottom, and the well cementation section includes 9 meters of long wall casings, and cement mortar recharge is used between the wall casing and well bore;The filter well section includes 11 meters of long water-permeable pipes, filter is equipped between the water-permeable pipe and well bore, and cobblestone is filled between water-permeable pipe and well bore;Filter well section bottom is provided with 40 meters long of production well section, the diameter of the production well section is less than the diameter of the well cementation section and filter well section.In the present invention, underground water in boulder bed and bedrock fracture layer can be introduced into geothermal well by geothermal well simultaneously, so that having abundant water resources in geothermal well, subsequently to provide sound assurance to the utilization of underground heat, and filter can obstruct the silt of underground water in boulder bed between water-permeable pipe and well bore, it prevents silt from entering in geothermal well, improves the quality at water source in geothermal well.

Description

Geothermal well based on Bedrock Geology
Technical field
The present invention relates to geothermal well technical fields, and in particular to a kind of geothermal well based on Bedrock Geology.
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 Bedrock Geology, including the abundant bedrock fracture layer of water content and the compact structure that is positioned above Horizon d, and can include generally mainly farinose argillic horizon, boulder bed there are certain thickness unconsolidated formation in the top of horizon d With argillaceous siltstoue etc..Wherein, mainly there are boulder bed and bedrock fracture layer in water-bearing layer, the underground water impurity wherein in boulder bed compared with It is more, and the sediment charge of the underground water of bedrock fracture layer is then less, the existing geothermal well based on Bedrock Geology generally only with The underground water of bedrock fracture layer reduces filtration step, but also results in the waste of the energy simultaneously, and for bedrock fracture layer The case where water content less geology, the case where also resulting in insufficient water sources in geothermal well, occur.
And if the water of boulder bed and Bedrock Crevice Water to be introduced into geothermal well simultaneously, it is necessary to the ground of boulder bed Lower water is filtered processing, the filter of existing geothermal well in order to keep underground water water outlet smooth, generally filter opening is arranged it is bigger than normal, Which results in part path silts can smoothly enter into geothermal well, extracts the water containing silt out when immersible pump and utilizes, and holds The damage for easily causing equipment, influences system operation, causes heavy losses;Moreover, increasing as silt enters the quantity in geothermal well It is more, it also results in hoistway and silts up, influence 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 Bedrock Geology, to ensure geothermal well It inside has abundant water resources, and improves the quality at water source in geothermal well, while keeping the temperature at water source in geothermal well.
A kind of geothermal well based on Bedrock Geology provided by the invention, including the well cementation section and filter that arrange from top to bottom Well section, the well cementation section includes 9 meters of long wall casings, and cement mortar recharge is used between the wall casing and well bore;The filtering Device well section includes 11 meters of long water-permeable pipes, filter is equipped between the water-permeable pipe and well bore, and between water-permeable pipe and well bore Fill cobblestone;Filter well section bottom is provided with 40 meters long of production well section, the diameter of the production well section is less than institute State the diameter of well cementation section and filter well section.
In the present invention, geothermal well is followed successively by well cementation section, filter well section and production well section from top to bottom, and geothermal well is built The geologic structure of position be divided into from top to bottom 7 meters of farinose argillic horizon, 13 meters of boulder bed, 4 meters of argillaceous siltstoue layer, 5 meters of horizon d and 31 meters of bedrock fracture layer, it is loosely organized due to farinose argillic horizon, and also water content is few, therefore in order to Ensure the stability of casing programme, and prevent cold water from entering in geothermal well, well cementation section depth is set to 9 meters, and use 9 meters The mode of long wall casing and recharge cement mortar is reinforced;Since the water content of boulder bed is abundant, it is arranged in boulder bed The filter well section that depth is 11 meters is reinforced, the filter being arranged between water-permeable pipe and well bore using 11 meters long of water-permeable pipes Silt in underground water can be obstructed between water-permeable pipe and well bore, prevent silt from entering in geothermal well, improve geothermal well The quality at middle water source, and cobblestone is filled between water-permeable pipe and well bore, to be further ensured that the stability of filter well section, together When due to filler it is identical as the main component of geology residing for filter well section, do not interfere with the circulation of underground water;Due to basement rock The water content of crack layer is abundant, therefore 40 meters long of production well section is arranged in filter well section bottom, will be in bedrock fracture layer Underground water be introduced into geothermal well, since the structure of argillaceous siltstoue layer, horizon d and bedrock fracture layer three is all more steady It is fixed, and sediment charge is few, therefore produce well section and be designed as open hole, the cost of construction can be reduced while underground heat can also be shortened The construction period of well improves construction efficiency.As it can be seen that the geothermal well provided by the invention based on Bedrock Geology, it can be simultaneously by ovum Underground water in rock layers and bedrock fracture layer is introduced into geothermal well, may make having abundant water resources in geothermal well, is follow-up underground heat Utilization provide sound assurance.
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 the structural schematic diagram of the geothermal well of the present invention based on Bedrock Geology;
Fig. 2 is the structural schematic diagram of the wall casing of the geothermal well of the present invention based on Bedrock Geology;
Fig. 3 is the schematic cross-sectional view of the filter of the geothermal well of the present invention based on Bedrock Geology;
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 that the base pipe of the filter of the geothermal well of the present invention based on Bedrock Geology is combined with two-stage filter Structural schematic diagram;
Fig. 8 is the structural representation of the two-stage filter of the filter of the geothermal well of the present invention based on Bedrock Geology Figure.
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 7 from top to bottom in the present embodiment Farinose argillic horizon, 13 meters of boulder bed, 4 meters of argillaceous siltstoue layer, 5 meters of horizon d and 31 meters of the bedrock fracture layer of rice, Wherein, farinose argillic horizon is loosely organized, and water content is few, and the structure of boulder bed is also loose, but aqueous abundant, argillaceous siltstoue Structure relative close, stability is preferable, and opposite water proof, the compact structure of horizon d and bedrock fracture layer, stability is good, basement rock Crack layer contains abundant underground water, and the underground water sediment charge of this layer is few;Therefore, in order to ensure the stabilization of casing programme Property, the geothermal well provided in an embodiment of the present invention based on Bedrock Geology is followed successively by well cementation section, filter well section and life from top to bottom Well section is produced, wherein well cementation section is 9 meters, correspondingly uses 9 meters long of wall casing 1 to reinforce, water is used between wall casing 1 and well bore Mud recharge, to improve the stability of geothermal well;Filter well section is 11 meters, and 11 meters long of water-permeable pipe 2 is correspondingly used to reinforce, It is equipped with filter 3 between water-permeable pipe 2 and well bore, and cobblestone is filled between water-permeable pipe 2 and well bore, further consolidates well bore The stability of structure, the underground water in boulder bed are flowed into from the hole on water-permeable pipe 2 in geothermal well via filter 3, are filtered Quality of groundwater afterwards is improved, and the content of silt is greatly decreased in water, can meet subsequently to the water source in geothermal well Utilize demand;It is 40 meters to produce well section, the underground water in bedrock fracture layer is introduced into geothermal well, due to argillaceous siltstoue Layer, the structure of horizon d and bedrock fracture layer three are all relatively stable, and sediment charge is few, thus produce well section be designed as it is naked Well can reduce the cost of construction while can also shorten the construction period of geothermal well, improve construction efficiency.As it can be seen that this implementation Underground water in boulder bed and bedrock fracture layer can be introduced into underground heat by the geothermal well based on Bedrock Geology that example provides simultaneously In well, having abundant water resources in geothermal well may make, the utilization for follow-up underground heat provides sound assurance.
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 Bedrock Geology, including the well cementation section and filter well section, feature that arrange from top to bottom exist In:
The well cementation section includes 9 meters of long wall casings, and cement mortar recharge is used between the wall casing and well bore;
The filter well section includes 11 meters of long water-permeable pipes, filter is equipped between the water-permeable pipe and well bore, and permeable Cobblestone is filled between pipe and well bore;
Filter well section bottom is provided with 40 meters long of production well section, the diameter of the production well section is less than the well cementation section With the diameter of filter well section;
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. the geothermal well according to claim 1 based on Bedrock Geology, 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. the geothermal well according to claim 2 based on Bedrock Geology, it is characterised in that:
The insulating layer is polyurethane foaming layer.
4. the geothermal well according to claim 2 based on Bedrock Geology, it is characterised in that:
The inner surface of the outer wall casing is provided with infrared-reflecting coated.
5. the geothermal well according to claim 4 based on Bedrock Geology, it is characterised in that:
The outer surface of the interior wall casing is provided with solar energy heat absorbing coating.
6. the geothermal well according to claim 2 based on Bedrock Geology, it is characterised in that:
The interior wall casing and outer wall casing are stainless steel.
7. the geothermal well according to claim 6 based on Bedrock Geology, it is characterised in that:
The inner surface of the interior wall casing is provided with corrosion-inhibiting coating.
CN201610773120.4A 2016-08-30 2016-08-30 Geothermal well based on Bedrock Geology Active CN106194124B (en)

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CN108868688A (en) * 2017-05-08 2018-11-23 国际壳牌研究有限公司 Handle method, equipment and the system of drilling well

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CN101349450A (en) * 2008-06-27 2009-01-21 赵铭 Deep layer terrestrial heat renewable energy source winter heating method
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