CN205977183U - Geothermal well based on basement rock geology - Google Patents

Geothermal well based on basement rock geology Download PDF

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Publication number
CN205977183U
CN205977183U CN201620998370.3U CN201620998370U CN205977183U CN 205977183 U CN205977183 U CN 205977183U CN 201620998370 U CN201620998370 U CN 201620998370U CN 205977183 U CN205977183 U CN 205977183U
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well
filter
pipe
geothermal well
geothermal
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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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Abstract

The utility model provides a geothermal well based on basement rock geology, include from last well cementation section and filter well section to range down, the well cementation section is including 9 meters long casing pipes, adopt the grout to recharge between casing pipe and the well bore, filter well section includes the 11 meters long pipe that permeates water, it is equipped with the filter to permeate water between pipe and the well bore, just permeating water and filling the cobblestone between pipe and the well bore, filter well section bottom is provided with 40 meters long producing well section, and the diameter of this producing well section is less than the diameter of well cementation section and filter well section. The utility model discloses in, during the geothermal well can be be simultaneously introduced with the groundwater in boulder bed and the basement rock crack layer to the geothermal well for having abundant water resources in the geothermal well provides the sound assurance for follow -up to geothermal utilization, and the filter can permeate water the silt separation of groundwater in the boulder bed between pipe and the well bore, prevents that silt from getting into the geothermal well, has improved the quality at water source in the geothermal well.

Description

Geothermal well based on Bedrock Geology
Technical field
This utility model is related to geothermal well technical field and in particular to a kind of geothermal well based on Bedrock Geology.
Background technology
Underground heat is a kind of energy resource producing 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, its DEVELOPMENT PROSPECT is very wide in terms of heating and refrigerating.
Building geothermal well is the committed step that geothermal energy resources are utilized, for different geology, the casing programme of geothermal well It is not quite similar.For Bedrock Geology, including water content the bedrock fracture layer enriching and the compact structure being positioned above Horizon d, and typically can there are certain thickness unconsolidated formation above horizon d, mainly include farinose argillic horizon, boulder bed With argillaceous siltstoue etc..Wherein, mainly there are boulder bed and bedrock fracture layer in water-bearing layer, and the underground water impurity wherein in boulder bed is relatively Many, and the sediment charge of the subsoil water of bedrock fracture layer is then less, the existing geothermal well based on Bedrock Geology typically only with The subsoil water of bedrock fracture layer, decreases filtration step, but also result in the waste of the energy simultaneously, and for bedrock fracture layer The situation of the geology of moisture content less, the situation also resulting in insufficient water sources in geothermal well occurs.
And if the water of boulder bed and Bedrock Crevice Water to be incorporated in geothermal well the ground it is necessary to boulder bed simultaneously Lower water carries out filtration treatment, and filter opening, in order that subsoil water water outlet is smooth, is typically arranged bigger than normal by the filter of existing geothermal well, Which results in part path silt can smoothly enter in geothermal well, when immersible pump, the water containing silt is extracted out and utilized, hold Easily cause the damage of equipment, affect system operation, cause heavy losses;And, the quantity entering with silt in geothermal well increases Many, also result in hoistway and silt up, the normal use of impact geothermal well.
Utility model content
For defect of the prior art, this utility model provides a kind of geothermal well based on Bedrock Geology, to ensure ground Have abundant water resources in hot well, and improve the quality at water source in geothermal well, keep the temperature at water source in geothermal well simultaneously.
A kind of geothermal well based on Bedrock Geology that this utility model provides, including the well cementation section arranging from top to bottom and mistake Filter well section, described well cementation section includes 9 meters of long wall casings, adopts cement mortar recharge between described wall casing and well bore;Described Filter well section includes 11 meters of long water-permeable pipes, is provided with filter between described water-permeable pipe and well bore, and in water-permeable pipe and well bore Between fill cobblestone;It is provided with 40 meters long of production well section in described filter well section bottom, the diameter of this production well section is little Diameter in described well cementation section and filter well section.
In this utility model, geothermal well is followed successively by well cementation section, filter well section from top to bottom and produces well section, and geothermal well The geologic structure building position is divided into 7 meters of farinose argillic horizon, 13 meters of boulder bed, 4 meters of shale flour sand from top to bottom The bedrock fracture layer of rock stratum, 5 meters of horizon d and 31 meters, 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 adopts Reinforced with the mode of 9 meters of long wall casings and recharge cement mortar;Water content due to boulder bed is enriched, therefore in boulder bed Setting depth is 11 meters of filter well section, is reinforced using 11 meters long of water-permeable pipes, the mistake of setting between water-permeable pipe and well bore Filter can intercept the silt in subsoil water between water-permeable pipe and well bore, prevent silt from entering in geothermal well, improve ground The quality at water source in hot well, and fill cobblestone between water-permeable pipe and well bore, to be further ensured that stablizing of filter well section Property, simultaneously because implant is identical with the main component of geology residing for filter well section, do not interfere with the circulation of subsoil water;Due to The water content of bedrock fracture layer is enriched, and therefore arranges 40 meters long of production well section in filter well section bottom, by bedrock fracture Layer in subsoil water be incorporated in geothermal well, due to argillaceous siltstoue layer, horizon d and bedrock fracture layer three structure all relatively It is stable, and sediment charge is few, therefore produce well section and be designed as open hole, the cost that can reduce construction can also shorten simultaneously The construction period of geothermal well, improves efficiency of construction.It can be seen that, the geothermal well based on Bedrock Geology that this utility model provides, permissible Subsoil water in boulder bed and bedrock fracture layer is incorporated in geothermal well simultaneously, having abundant water resources in geothermal well can be made, be Follow-up underground heat using providing sound assurance.
Preferably, described wall casing includes outer wall casing and interior wall casing, and described interior wall casing passes through fixed support and institute State outer wall casing to connect, between described outer wall casing and interior wall casing, be provided with heat-insulation layer.Because well cementation section is in the upper of well bore Side, the temperature on this stratum is relatively low, and the water source in geothermal well touches wall casing and heat will be led to scatter and disappear, therefore, in well cementation section Place's setting heat-insulation layer can effectively prevent the loss of water source heat in geothermal well.
Preferably, described heat-insulation layer is polyurethane foaming layer.Using foaming technique between outer wall casing and interior wall casing shape The polyurethane insulation coating becoming has good heat insulation effect, disclosure satisfy that long insulation demand, and polyurethane material tool There are good wearability, resistance to ag(e)ing and cohesive, go for the use environment of geothermal well.
Preferably, the inner surface setting of described outer wall casing have infrared-reflecting coated.Outer wall casing inner surface setting Infrared reflection coating can reflect to 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 described interior wall casing is provided with solar energy heat absorbing coating.Due to interior wall casing directly contact Water source in geothermal well, leads to its outer surface to have higher temperature, and solar energy heat absorbing coating can preferably absorb infrared ray, from And the outer surface in interior wall casing forms a heat build-up layer, in reduction, the heat of wall casing overflows, and further increases insulation effect Really.
Preferably, described interior wall casing and outer wall casing are stainless steel.Interior wall casing using stainless steel The intensity of casing programme can be improved with outer wall casing, prevent well bore from caving in, and stainless steel have preferably corrosion-resistant Property, go for complicated water source environment in geothermal well, extend the service life of geothermal well.
Preferably, the inner surface setting of described interior wall casing has corrosion-inhibiting coating.Environment due to underground typically all compares evil Bad, the corrosivity at the water source in geothermal well are stronger, in the inner surface setting corrosion-inhibiting coating of interior wall casing, it can be protected Shield, extends its service life.
Preferably, described filter includes first level filtering device and two-stage filter, described two-stage filter setting In described first level filtering device;Described first level filtering device includes base pipe, protection block reinforcement and bag net, and described base pipe is circle Pipe, described basis tube wall has been evenly arranged permeable hole, described protection block reinforcement is vertically welded in basic pipe outer wall, protection gear Muscle is equally spaced, and described bag net is wrapped in protection block reinforcement and basic pipe outer wall, and the scope of the vertical parcel of bag net is more than protection The scope of block reinforcement, bag net external iron wire is fastened in protection block reinforcement and basic pipe outer wall;Described two-stage filter includes Inner tube, outer tube, dividing plate and filter element, said inner tube and outer tube are pipe, and inner and outer tubes are coaxially disposed, on outer tube wall uniformly It is disposed with permeable hole, outer tube top is provided with suspension ring, described dividing plate one end is fixedly connected with outer wall of inner tube, the dividing plate other end is with outward Inside pipe wall is fixedly connected, and dividing plate will be divided into multiple chambers between inner tube and outer tube, and described filter element is filled in the cavity, chamber Room upper and lower side is uncovered, for discharging the water after filter element filtering;Described outer tube top is provided with the outer of annular outwardly Pipe excrescence, described base pipe is provided with excrescence under excrescence and base pipe on the base pipe of inwardly projecting annular, described Outer tube is passed down through excrescence inner circle on described base pipe, and outer tube excrescence is pressed on excrescence on base pipe, outer pipe bottom pressure On excrescence under described base pipe, described base pipe is lined with rubber cushion between excrescence and outer tube excrescence, described base pipe Lower between excrescence and outer pipe bottom, it is lined with rubber cushion.
Filter in this utility model includes first level filtering device and two-stage filter.Wherein first level filtering device pair Silt carries out coarse filtration, is mainly used in filtering out oarse-grained sand, and basic tube wall has been evenly arranged permeable hole, bag net parcel Outer in pipe, subsoil water will enter in geothermal well, first have to the permeable hole two-layer through bag net and base pipe and filter, filter out big The sand of grain.Two-stage filter carries out fine straining to silt, is mainly used in filtering out tiny silt, two-stage filter includes Inner tube, outer tube, dividing plate and filter element, inner tube is coaxially arranged with outside, and dividing plate is the connecting framework of inner tube and outer tube, simultaneously by inner tube Space and outer tube between is divided into multiple cavities, filling filter element in cavity, by such design, makes whole two-stage filter For an entirety, sound construction;Two-stage filter is mainly by the filter element two being located in the permeable hole and chamber on outer tube wall Layer filters, and inner pipe wall is not provided with permeable hole, and chamber upper and lower end is uncovered, after subsoil water enters chamber, along the upper and lower stream of chamber Dynamic, discharge from chamber upper and lower end, by such design, extend flow path in filter element for the subsoil water, improve filtration Effect.First level filtering device filter opening is larger, is not easily blocked, and can filter out bulky grain sand, and two-stage filter filter opening is little, easily Blocking, can filter out tiny silt, by the way of this classified filtering, more thoroughly can filter out sand, and can reduce The probability of plugged filter.Outer tube is passed down through excrescence inner circle on base pipe, and outer tube excrescence is pressed in excrescence on base pipe On, outer pipe bottom is pressed on excrescence under base pipe, so that two-stage filter and first level filtering device is combined together, and it Between be all lined with rubber cushion, rubber cushion, good sealing effect are compacted by the deadweight of two-stage filter, silt will not be from slit flow Go out.Two-stage filter is integral design, can separate with excrescence under excrescence on base pipe and base pipe easily, can pass through Two-stage filter is integrally hung out geothermal well and is carried out, keeps in repair or changes by the suspension ring being arranged on outer tube top, cleans, keeps in repair Or hang in two-stage filter in geothermal well again after changing, it is used in combination with first level filtering device, thus can extend The service life of filter, further increases the quality at water source in geothermal well.
Preferably, described filter element is rustless steel filter element, and the outer wall of said inner tube and dividing plate are provided with consolidating outwardly Determine part, described fixture is used for fixing described rustless steel filter element;The cross-sectional area of each chamber described is equal.Rustless steel filter element has There is good strainability, the underground water energy after filtration meets system use requirement, its corrosion resistance, thermostability, resistance to pressure, wear-resisting Property good, severe underground environment can be met, its core pore is uniform, accurate filtering accuracy, the flow of unit area is big, can improve The efficiency of fine straining, improves filter efficiency, can reuse after its cleaning, free of replacement, economizes on resources, reduces cost;Through coarse filtration Subsoil water afterwards after the permeable hole of outer tube enters chamber, along the upper and lower flowing of chamber, through the uncovered discharge of chamber, easily send out by filter element Raw displacement, conglomeration, fixture plays fixation to rustless steel filter element, and during filtration, the flowing of water will not make filter element be subjected to displacement, filter Core will not conglomeration, thus ensure that the normal work of filter element, improve filter effect;And the cross-sectional area of each chamber is equal, enters Go out the water yield of chamber uniformly, effect and the efficiency of filtration can be lifted further.
Preferably, the permeable hole of described base pipe is bar hole, and the bar hole of described upper and lower adjacent two rows mutually staggers. Using bar hole, coarse filtration can be met and require, upper and lower adjacent two rows mutually stagger, and so that permeable hole is more evenly distributed, filter and enter base The subsoil water of plinth pipe also evenly, can lift effect and the efficiency of filtration further.
Preferably, in order to optimize structure, described protection block reinforcement adopts antirust round steel, and a diameter of 4mm of described round steel, between round steel Away from for 20mm.
Preferably, described bag net is nylon yarn bag net.Nylon yarn bag net can filter out oarse-grained sand, reaches coarse filtration Require.
Preferably, described iron wire adopts galvanized wire, and it is 10mm that iron wire is wound around spacing.Using galvanized wire, prevent from being wound around Iron wire rupture because being corroded, lead to bag net to come off, simultaneously in order to optimize structure, it is 10mm that iron wire is wound around spacing.
Preferably, the permeable hole of described outer tube is circular port, and described circular port left and right two arranges and mutually staggers.Using circle Hole, can meet the requirement of fine straining, left and right adjacent two row mutually stagger, and so that permeable hole is more evenly distributed, enter the subsoil water of chamber Also evenly, lifting is filtered effect and efficiency.
Preferably, the discharge area of the permeable hole of described base pipe is more than the discharge area of the permeable hole of described 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 fine straining Amount, lifts filter efficiency.
Preferably, described base pipe surfaces externally and internally, the surface of the surfaces externally and internally of inner tube, the surfaces externally and internally of outer tube and permeable hole All scribble corrosion-resistant coating.The environment of underground typically all compares badly, and corrosivity are stronger, in base pipe surfaces externally and internally, inner tube These parts with subsoil water or soil directly contact of the surface of outer surface, the surfaces externally and internally of outer tube and permeable hole apply one layer anti-corrosion Erosion layer, can reduce the corrosion of filter component, increase the service life.
Brief description
In order to be illustrated more clearly that this utility model specific embodiment or technical scheme of the prior art, below will be right In specific embodiment or description of the prior art, the accompanying drawing of required use is briefly described.In all of the figs, similar Element or partly typically identified by similar reference.In accompanying drawing, each element or part might not be according to actual ratios Draw.
Fig. 1 is the structural representation of the geothermal well based on Bedrock Geology described in the utility model;
Fig. 2 is the structural representation of the wall casing of the geothermal well based on Bedrock Geology described in the utility model;
Fig. 3 is the cross section structure diagram of the filter of the geothermal well based on Bedrock Geology described in the utility model;
Fig. 4 is the A-A sectional view of Fig. 3;
Fig. 5 is the B-B sectional view of Fig. 3;
Fig. 6 is the C-C sectional view of Fig. 3;
Fig. 7 is the base pipe of filter and the two-stage filter of the geothermal well based on Bedrock Geology described in the utility model In conjunction with structural representation;
Fig. 8 is that the structure of the two-stage filter of filter of the geothermal well based on Bedrock Geology described in the utility model is shown It is intended to.
Reference:
1- wall casing;2- water-permeable pipe;3- filter;
The outer wall casing of 11-;Wall casing in 12-;13- fixed support;14- polyurethane insulation coating;15- infrared reflection applies Layer;16- solar energy heat absorbing coating;31- base pipe;32- protects block reinforcement;33- bag net;34- iron wire;35- outer tube;36- inner tube; 37- chamber;38- dividing plate;39- permeable hole;
Excrescence on 311- base pipe;Excrescence under 312- base pipe;351- outer tube excrescence;352- suspension ring;361- is solid Determine part.
Specific embodiment
Below in conjunction with accompanying drawing, the embodiment of technical solutions of the utility model is described in detail.Following examples are only For the technical solution of the utility model is clearly described, therefore it is only used as example, and this practicality can not be limited with this New protection domain.
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 The bedrock fracture layer of the farinose argillic horizon of rice, 13 meters of boulder bed, 4 meters of argillaceous siltstoue layer, 5 meters of horizon d and 31 meters, 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 preferably, water proof relatively, the compact structure of horizon d and bedrock fracture layer, good stability, basement rock Crack layer contains abundant subsoil water, and the subsoil water sediment charge of this layer is few;Therefore, in order to ensure stablizing of casing programme Property, the geothermal well based on Bedrock Geology that this utility model embodiment provides, it is followed successively by well cementation section, filter well section from top to bottom With produce well section, wherein well cementation section be 9 meters, correspondingly reinforced using 9 meters long of wall casing 1, adopt between wall casing 1 and well bore Use cement mortar recharge, to improve the stability of geothermal well;Filter well section is 11 meters, correspondingly adopts 11 meters long of water-permeable pipe 2 Reinforce, be provided with filter 3 between water-permeable pipe 2 and well bore, and fill cobblestone between water-permeable pipe 2 and well bore, consolidate further The stability of well cementation body structure, the subsoil water in boulder bed is flowed into geothermal well via filter 3 from the hole water-permeable pipe 2 In, the quality of groundwater after filtration is improved, and in water, the content of silt is greatly decreased, and can meet subsequently in geothermal well The utilization demand at water source;Produce well section and be 40 meters, the subsoil water in bedrock fracture layer is incorporated in geothermal well, due to shale The structure of flour sand rock stratum, horizon d and bedrock fracture layer three is all relatively stable, and sediment charge is few, therefore produces well section and sets It is calculated as open hole, the cost that can reduce construction can also shorten the construction period of geothermal well simultaneously, improve efficiency of construction.It can be seen that, Subsoil water in boulder bed and bedrock fracture layer can be introduced by the geothermal well based on Bedrock Geology that the present embodiment provides simultaneously To in geothermal well, having abundant water resources in geothermal well can be made, for follow-up underground heat using providing sound assurance.
As shown in Fig. 2 described wall casing 1 includes outer wall casing 11 and interior wall casing 12, this interior wall casing 12 passes through to fix Support 13 is connected with outer wall casing 11, is provided with the polyurethane heat-insulation that foaming is formed between outer wall casing 11 and interior wall casing 12 Layer 14, because well cementation section is in the top of well bore, the temperature on this stratum is relatively low, and the water source in geothermal well touches interior wall casing 12 Heat will be led to scatter and disappear, therefore, setting heat-insulation layer can effectively prevent the loss of water source heat in geothermal well at well cementation section;Institute The inner surface stating outer wall casing 11 is provided with infrared-reflecting coated 15, and this infrared-reflecting coated 15 is with thermoset resin material For film formation at low temp material, with low melting point and low-expansion coefficient special crown glass binding agent as high temperature bonding material, through special work Skill processing preparation a kind of that there is infrared external reflection function, high temperature resistant, caking property is strong and the organo-mineral complexing of nontoxic pollution-free Coating, can reflect to the infrared ray of polyurethane insulation coating 14, reduce the diffusion of polyurethane insulation coating 14 heat, improve and protect Temp effect;Due to the water source in interior wall casing 12 directly contact geothermal well, its outer surface is led to have higher temperature, therefore in institute The outer surface stating interior wall casing 12 is provided with solar energy heat absorbing coating 16, preferably can absorb infrared ray, thus in interior wall casing 12 outer surface forms a heat build-up layer, and in reduction, the heat of wall casing 12 overflows, and further increases heat insulation effect, this sun Can heat absorbing coating 16 be the anodized coating of steel, there is humidity it is adaptable to use environment 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, goes for complicated water source environment in geothermal well, prolongs The service life of long geothermal well
Further, since the environment of underground typically all compares badly, the corrosivity at the water source in geothermal well are stronger, therefore upper The inner surface setting stating interior wall casing 12 has corrosion-inhibiting coating, to protect to it further, extends its service life.This enforcement , with polyurethane modified epoxy resin as substrate, with mica iron oxide red for main color stuffing, it is not to for the corrosion-inhibiting coating that example adopts Rust steel surface has stronger adhesive force, can work for a long time and do not fall off under the moist environment of geothermal well.
As shown in fig. 3 to 7, described filter includes first level filtering device and two-stage filter, and two-stage filter is arranged In first level filtering device;First level filtering device includes base pipe 31, protection block reinforcement 32 and the bag net 33 of circle, and base pipe 31 is managed Permeable hole 39 is evenly arranged on wall, permeable hole 39 is bar hole, upper and lower adjacent two rows mutually stagger, protection block reinforcement 32 adopts The antirust round steel of a diameter of 4mm, is vertically welded on base pipe 31 outer wall, and its spacing is 20mm, and bag net 33 is nylon yarn bag net 33, it is wrapped on protection block reinforcement 32 and base pipe 31 outer wall, the scope that bag net 33 vertically wraps up is more than the scope of protection block reinforcement 32, Bag net 33 external galvanized wire 34 is fastened in protection block reinforcement 32 and base pipe 31 outer wall with 10mm spacing;Cascade filtration fills Put including inner tube 36, outer tube 35, dividing plate 38 and filter element, inner tube 36 and outer tube 35 are pipe, and inner tube 36 and outer tube 35 coaxially set Put, outer tube 35 tube wall has been evenly arranged permeable hole 39, permeable hole 39 is circular port, 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, and outer tube 35 top is provided with four suspension ring 352, every Plate 38 one end is fixedly connected with inner tube 36 outer wall, and dividing plate 38 other end is fixedly connected with outer tube 35 inwall, and dividing plate 38 is by inner tube 36 It is divided into the equal chamber of multiple cross-sectional areas 37 between outer tube 35, filter element adopts rustless steel filter element, is filled in chamber 37, Chamber 37 upper and lower side is uncovered, for discharging the water after filter element filtering, the outer wall of inner tube 36 and dividing plate 38 is provided with outwards Prominent fixture 361, fixture 361 is used for fixing rustless steel filter element, base pipe 31 surfaces externally and internally, the interior appearance of inner tube 36 The surface in face, the surfaces externally and internally of outer tube 35 and permeable hole 39 all scribbles corrosion-resistant coating;Outer tube 35 top is provided with outwardly Annular outer tube excrescence 351, base pipe 31 is provided with and projects under excrescence 311 and base pipe on inwardly projecting ring foundation pipe Body 312, outer tube 35 is passed down through excrescence 311 inner circle on base pipe, and outer tube excrescence 351 is pressed in excrescence 311 on base pipe On, outer tube 35 bottom is pressed on excrescence 312 under base pipe, and base pipe is lined between excrescence 311 and outer tube excrescence 351 Rubber cushion, is lined with rubber cushion between excrescence 312 and outer tube 35 bottom under base pipe.
Wherein first level filtering device carries out coarse filtration to silt, is mainly used in filtering out oarse-grained sand;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 so that permeable hole 39 is more evenly distributed, filter into Enter the subsoil water of base pipe 31 also evenly, nylon yarn bag net 33 passes through to protect block reinforcement 32 pad, is wrapped in outside pipe, uses galvanized iron Silk 34 is fixing, and subsoil water will enter in geothermal well, first has to the permeable hole 39 two-layer mistake through nylon yarn bag net 33 and base pipe Filter, filters out oarse-grained sand.Two-stage filter carries out fine straining to silt, is mainly used in filtering out tiny silt, and two Level defecator includes inner tube 36, outer tube 35, dividing plate 38 and filter element, and inner tube 36 is coaxially arranged with outer tube 35, and dividing plate 38 is inner tube 36 with the connecting framework of outer tube 35, the space between inner tube 36 and outer tube 35 is divided into the equal chamber of multiple cross-sectional areas simultaneously 37, filtered by such segmentation, each chamber 37 water yield uniformly, can lift the effect filtering and efficiency, the interior filling of chamber 37 is not Rust steel filter element, by such design, makes whole two-stage filter be an entirety, sound construction;Meanwhile, rustless steel filter element There is good strainability, the underground water energy after filtration meets system use requirement, its corrosion resistance, thermostability, resistance to pressure, resistance to Mill property is good, can meet severe underground environment, its core pore is uniform, accurate filtering accuracy, and the flow of unit area is big, can carry The efficiency of high fine straining, meets system water demand, can reuse after its cleaning, free of replacement, economizes on resources, reduces cost; Two-stage filter filters mainly by the filter element two-layer in the permeable hole 39 and chamber 37 being located on outer tube 35 tube wall, permeable hole 39 Upper and lower adjacent two row mutually stagger, and so that permeable hole 39 is more evenly distributed, enter the subsoil water of chamber 37 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 fine straining Amount, lifts filter efficiency;Inner tube 36 is not provided with permeable hole 39, chamber 37 upper and lower end opening, after subsoil water enters chamber 37, to Flowing in chamber 37 two ends, discharges from chamber 37 upper and lower end, by such design, extend flowing in filter element for the subsoil water Path, improves filter effect, and because, in filter process, filter element is susceptible to displacement, conglomeration, fixture 361 is filtered to rustless steel Core plays fixation, and during filtration, the flowing of water will not make filter element be subjected to displacement, filter element will not conglomeration, thus ensure that filter element Normal work, improves filter effect;The environment of underground typically all compares badly, and corrosivity are stronger, 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 subsoil water or soil Tactile part applies one layer of corrosion-resistant coating, can reduce the corrosion of filter component, increase the service life.
First level filtering device filter opening is larger, is not easily blocked, and can filter out bulky grain sand, and two-stage filter filter opening is little, Easily block, tiny silt can be filtered out, by the way of this classified filtering, more thoroughly can filter out sand, and energy Reduce the probability of plugged filter.
Outer tube 35 is passed down through excrescence 311 inner circle on base pipe, and outer tube excrescence 351 is pressed in excrescence on base pipe On 311, outer tube 35 bottom is pressed on excrescence 312 under base pipe, by this dismountable mode by two-stage filter and First level filtering device is combined together, in combination with being all lined with rubber cushion between position, by the deadweight compacting of two-stage filter Rubber cushion, good sealing effect, silt will not flow out from gap;Two-stage filter and first level filtering device detachably separate, permissible Two-stage filter is integrally lifted cleaning, maintenance by the suspension ring 352 of outer tube 35 top setting or change, cleaning, maintenance Or hang in two-stage filter in geothermal well again after changing, it is used in combination with first level filtering device, thus improve The quality at water source in geothermal well.
Filter described in the present embodiment draw water different with the method for operation in recharge, specific as follows:
When drawing water, need first level filtering device and two-stage filter collective effect, secondary protection device is hung in underground heat In well, outer tube 5 is passed down through excrescence 311 inner circle on base pipe, and outer tube excrescence 351 is pressed on excrescence 311 on base pipe, Fit together with first level filtering device, the subsoil water containing silt flows through nylon yarn bag net 33, through the bar shaped on base pipe 31 Permeable hole 39 enters in geothermal well, completes the one-level of silt in the outer filtration through nylon yarn bag net 33 and bar shaped permeable hole 39 of well Filter;Subsoil water after coarse filtration enters chamber 37 through the circular permeable hole on outer tube 35, the fine straining through rustless steel filter element, from The upper and lower uncovered discharge of chamber 37, completes the cascade filtration of silt, thus being met the underground water source of Production requirement.
Recharge is intended to for the water source after utilization to go back to underground through underground heat well irrigation, in order to reduce the resistance of recharge, needs two grades Defecator integrally hangs out outside well, and recharge water flows out through the bar shaped permeable hole 39 on base pipe 31, then passes through nylon yarn bag net 33 flow back into underground, contrary with the flow direction drawing water when filtering, and play the role of cleaning to first level filtering device, prevent filter opening from blocking up Plug, meanwhile, after two-stage filter hangs out, can be carried out to it, keeps in repair or maintain.
Finally it should be noted that:Above example only in order to the technical solution of the utility model to be described, is not intended to limit; Although being described in detail to this utility model with reference to the foregoing embodiments, it will be understood by those within the art that: It still can be modified to the technical scheme described in previous embodiment, or to wherein some or all of technical characteristic Carry out equivalent;And these modifications or replacement, do not make the essence of appropriate technical solution depart from this utility model embodiment The scope of technical scheme, it all should be covered in the middle of the scope of claim of the present utility model and description.

Claims (10)

1. a kind of geothermal well based on Bedrock Geology, including the well cementation section arranging from top to bottom and filter well section, its feature exists In:
Described well cementation section includes 9 meters of long wall casings, adopts cement mortar recharge between described wall casing and well bore;
Described filter well section includes 11 meters of long water-permeable pipes, is provided with filter between described water-permeable pipe and well bore, and permeable Cobblestone is filled between pipe and well bore;
It is provided with 40 meters long of production well section in described filter well section bottom, the diameter of this production well section is less than described well cementation section Diameter with filter well section.
2. the geothermal well based on Bedrock Geology according to claim 1 it is characterised in that:
Described wall casing includes outer wall casing and interior wall casing, and described interior wall casing passes through fixed support with described outer wall casing even Connect, between described outer wall casing and interior wall casing, be provided with heat-insulation layer.
3. the geothermal well based on Bedrock Geology according to claim 2 it is characterised in that:
Described heat-insulation layer is polyurethane foaming layer.
4. the geothermal well based on Bedrock Geology according to claim 2 it is characterised in that:
The inner surface setting of described outer wall casing has infrared-reflecting coated.
5. the geothermal well based on Bedrock Geology according to claim 4 it is characterised in that:
The outer surface of described interior wall casing is provided with solar energy heat absorbing coating.
6. the geothermal well based on Bedrock Geology according to claim 2 it is characterised in that:
Described interior wall casing and outer wall casing are stainless steel.
7. the geothermal well based on Bedrock Geology according to claim 6 it is characterised in that:
The inner surface setting of described interior wall casing has corrosion-inhibiting coating.
8. the geothermal well based on Bedrock Geology according to claim 1 it is characterised in that:
Described filter includes first level filtering device and two-stage filter, and described two-stage filter is arranged at described one-level mistake In filter device;
Described first level filtering device includes base pipe, protection block reinforcement and bag net, and described base pipe is pipe, described basis tube wall On be evenly arranged permeable hole, described protection block reinforcement is vertically welded in basic pipe outer wall, protection block reinforcement be equally spaced, described Bag net is wrapped in protection block reinforcement and basic pipe outer wall, and the scope of the vertical parcel of bag net is more than the scope of protection block reinforcement, and bag net is outer It is fastened in protection block reinforcement and basic pipe outer wall with iron wire;
Described two-stage filter includes inner tube, outer tube, dividing plate and filter element, and said inner tube and outer tube are pipe, and inner tube is with outward Pipe is coaxially disposed, and outer tube wall has been evenly arranged permeable hole, and outer tube top is provided with suspension ring, outside described dividing plate one end and inner tube Wall is fixedly connected, and the dividing plate other end is fixedly connected with outer tube wall, and dividing plate will be divided into multiple chambers, institute between inner tube and outer tube State filter element and fill in the cavity, chamber upper and lower side is uncovered, for discharging the water after filter element filtering;Described outer tube top It is provided with the outer tube excrescence of annular outwardly, described base pipe is provided with prominent on the base pipe of inwardly projecting annular Excrescence under body and base pipe, described outer tube is passed down through excrescence inner circle on described base pipe, and outer tube excrescence is pressed in basis On excrescence on pipe, outer pipe bottom is pressed on excrescence under described base pipe, excrescence and outer tube excrescence on described base pipe Between be lined with rubber cushion, be lined with rubber cushion under described base pipe between excrescence and outer pipe bottom.
9. the geothermal well based on Bedrock Geology according to claim 8 it is characterised in that:
Described filter element is rustless steel filter element, and the outer wall of said inner tube and dividing plate are provided with fixture outwardly, described solid Determine part to be used for fixing described rustless steel filter element;The cross-sectional area of each chamber described is equal.
10. the geothermal well based on Bedrock Geology according to claim 8 it is characterised in that:
The permeable hole of described base pipe is bar hole, and the bar hole of described upper and lower adjacent two rows mutually staggers.
CN201620998370.3U 2016-08-30 2016-08-30 Geothermal well based on basement rock geology Active CN205977183U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106194124A (en) * 2016-08-30 2016-12-07 湖南中大经纬地热开发科技有限公司 Geothermal well based on bedrock geology
CN114033340A (en) * 2021-11-16 2022-02-11 常州大学 Sand control filter equipment suitable for geothermal well

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106194124A (en) * 2016-08-30 2016-12-07 湖南中大经纬地热开发科技有限公司 Geothermal well based on bedrock geology
CN106194124B (en) * 2016-08-30 2018-10-19 湖南中大经纬地热开发科技有限公司 Geothermal well based on Bedrock Geology
CN114033340A (en) * 2021-11-16 2022-02-11 常州大学 Sand control filter equipment suitable for geothermal well
CN114033340B (en) * 2021-11-16 2023-12-01 常州大学 Sand control filter equipment suitable for geothermal well

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