CN105909214A - Method for exploiting compact dry heat rock geothermal energy by utilizing long horizontal well self-circulation structure - Google Patents
Method for exploiting compact dry heat rock geothermal energy by utilizing long horizontal well self-circulation structure Download PDFInfo
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- CN105909214A CN105909214A CN201610231296.7A CN201610231296A CN105909214A CN 105909214 A CN105909214 A CN 105909214A CN 201610231296 A CN201610231296 A CN 201610231296A CN 105909214 A CN105909214 A CN 105909214A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
- E21B7/046—Directional drilling horizontal drilling
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
- E21B7/06—Deflecting the direction of boreholes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24T—GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
- F24T10/00—Geothermal collectors
- F24T10/20—Geothermal collectors using underground water as working fluid; using working fluid injected directly into the ground, e.g. using injection wells and recovery wells
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
Abstract
The invention relates to a field of geothermal energy development and provides a method for exploiting compact dry heat rock geothermal energy by utilizing a long horizontal well self-circulation structure. According to the invention, a single long horizontal well in a dry heat rock storage layer is utilized, an oil pipe-loop empty circulation structure of the single long horizontal well is adopted under a condition of not cracking the dry heat rock storage layer for performing circulation injection and production of heat carrying medium. During the injection process, a horizontal segment can be utilized fully for heating the heat carrying medium. During a production process, a prestress heat isolation oil tube is used for reducing heat loss of the heat carrying medium by using the prestress heat isolation oil tube. According to the invention, fluid loss caused by cracking can be avoided and the contact area of a well shaft and the storage layer is increased effectively due to the long horizontal segment. During the injection and production process, the temperature difference of the heat carrying medium also causes heat siphonage, so that ground injection and suction pump power is reduced effectively. At the same time, due to the closeness of the long horizontal well self-circulation structure, condition is provided for performance optimization of the heat carrying medium and problems of corrosion and scale formation are avoided and the heat collecting process becomes more reliable and stable.
Description
Technical field
The present invention relates to geothermal energy development field, be specifically related to one and utilize oil pipe of horizontal well and annular circulation note sampled-current body
Carry out a kind of process of geothermal energy exploitation.
Background technology
Underground heat is to have one of promising regenerative resource, with other new forms of energy such as phase such as solar energy, wind energy and biomass energy
Ratio, has distribution wide, by spies such as ectocine little (as round the clock, wind speed, the temperature difference), carbon emission amount and maintenance cost are low
Point.Underground heat can be divided into convection, conduction type and hot lithotype three kinds.Convection underground heat passes through hot water or water vapour deeply
Free convection in crack, portion by heat energy (the 50～350 DEG C) band of earth depths to earth's surface；Conduction type underground heat is positioned at mostly
Sedimentary rock reservoir (based on sandstone reservoir), due to blocking of top mud shale cap rock, the heat that earth formation deep upwards conducts
Amount is assembled in reservoir and is formed underground heat, mainly includes deep brine layer, oil gas field underground heat etc. (80～200 DEG C)；Xeothermic
Lithotype underground heat refers to the heat being stored in degree of depth 3-10km high heat rock mass or magma, and reservoir temperature is up to 100～650 DEG C.
China is located in circum pacific geothermal belt and Mediterranean-HIMALAYA GEOTHERMAL BELT scope, and geothermal energy resources enrich.
Heat reservori is usually seated at that surface temperature is higher, geological structure active and/or near volcano, is limited to reservoir traditionally
Place and reserves limit, and abundant geothermal energy cannot Appropriate application.Along with underground heat prospects the progress of development technique, reservoir is deep
Portion's geothermal energy resources such as hot dry rocks etc. are by lasting concern.Dry-hot-rock geothermal resource distribution is wide, and reserves are big, do not limited by geography
System, is the major domain of following geothermal energy development.Correlative study shows, single regional, 2000-6000m presses interiorly
Type underground heat recoverable reserves is 2.74 × 1019In J, 3000-8000m, dry-hot-rock geothermal recoverable reserves is 1.49 × 1021J, is about
Tens times of national total energy consumption in 2014 38.5 hundred million tons.The most economic exploitation reservoir deep earth heart can not only may be used
Energy-saving and emission-reduction and energy corrective action can be played, can be more that remote districts energy demand provides safeguard.
Hot dry rock buries deeply, broadly falls into greatly densification or ultralow permeability stratum, uses conventional injection-production method to carry out underground heat and opens
When sending out, need to carry out extensive vertical well fracture and horizontal well in segments volume fracturing technology, formed and take thermal medium (if water is with super
Critical CO2) circulation canal.The U.S. is the earliest to dry-hot-rock geothermal developmental research country the earliest.Within 1977, successfully bore
Obtaining the xeothermic rock stratum of 4500m, and be successfully established First hot dry rock power station in the world in 1984, generated output is the highest can
Reach 10MW.Within 1880, Japanese government has carried out hot dry rock generating feasibility study, and pierces xeothermic rock stratum in chevron county
Carry out hydraulic pressure test.1977-1986, the European Community subsidizes Germany and carries out at the Falkenberg of northeast, Bavaria
One EGS research, research hot dry rock cracking mechanism and the water migration mechanism in these cracks.International energy
Source is deployed on " the Hot Dry Rock Task " that 1997-2001 has exploited 4 years by a definite date, has organized multiple country to be done
Hot rock correlative study.Dry-hot-rock geothermal resource was detected in cooper basin by Australia in 2003, and result shows
Show that these basin geothermal reserves are up to 50,000,000,000 barrels of oil equivalent.Geodynamics company is successful at granite in September, 2003
A bite water injection well is completed on rock mass, and pressure break define a series of permanent UNICOMs crack.
Meanwhile, take thermal medium-water property noted for routine low, the problems such as circulation re-injection is difficult, combining CO2Resource
Changing and utilize technically, Brown et al. proposes note supercritical CO2Exploitation dry-hot-rock geothermal (CO2-EGS) concept, i.e. profit
Use supercritical CO2Pressure break hot dry rock reservoir, and utilize supercritical CO2Excellent percolation ability and unique hot physical property, follow
Ring injects thus carries geothermal energy and exploit.
But, being limited by technology, environmental protection and the economy of massive hydraulic fracture, dry-hot-rock geothermal exploitation is the most undesirable.Beautiful
The states such as state, Australia, Switzerland all carry out hot dry rock reservoir fracturing test.Test shows, at hard hot dry rock reservoir
The new crack of middle creation is hardly possible, is only capable of carrying out hydraulic fracturing in the most crannied reservoir, thus it is former to extend expansion
Reservoir Fracture is had to form fracture network.But, the flow channel that fracturing is formed, by reservoir stress and water-rock
Materialization effect, secondary closure and blocking after easily producing, it is impossible to long-time offer high efficiency flow and seepage channel；Fragility is xeothermic
During rock pressure is split, the extension in crack and be distributed uncontrollable, country rock and cap rock may be caused to produce crack and to cause and take heat Jie
A large amount of losses of matter, if taking thermal medium is CO2Time, more can cause serious environmental problem and safety problem；Extensive pressure
Splitting relatively costly, bad ground also needs to refracturing, and fracturing fluid is relatively big on the impact of environment, meeting in fracturing process
Induce other geological disasters etc..So that propose and use simple, effective, economical to carry out by taking thermal medium circulation
Adopt method and the technology of heat.
Horizontal Well Drilling completion technique be the eighties in last century international petroleum circle develop rapidly and become better and approaching perfection day by day one is comprehensive
Supporting technology, it includes horizontal well reservoir engineering and design optimizing, horizontal well experience orbits controlling technology, horizontal well
A series of important technologies such as drilling fluid and Overall Formation Protection Techniques Used, horizontal wellbore logging technology and horizontal well completion technology.Along with skill
Art gradually improves, no matter in sandstone, carbonate rock, igneous rock or Metamorphic Reservoirs, has been successfully made big
Being drilled of amount horizontal well.Recent years, along with the scale exploitation of the fine and close unconventionaloil pool such as oil-gas reservoir, shale gas, level
Well technical-economic index is persistently become better, and drilling cost is substantially reduced, and drill footage, drilling well well depth and lateral length have very
Big increase.Existing level well bores completion technique and is fully available for hot dry rock reservoir.
On the whole, hot dry rock drilling technology is not a problem, leakage problem that reservoir fracturing uncontrollability causes and seepage flow
The high efficiency flow of passage is the subject matter of restriction hot dry rock exploitation.Up to the present, one is not also had to pacify the most again
Full dry-hot-rock geothermal mining type.Based on this, the present invention is in the advantage taking into full account that dry-hot-rock geothermal develops various technology
On the basis of deficiency, bore well-completing process in conjunction with existing level well, it is proposed that one utilizes long horizontal well self-loopa exploitation densification
The method of dry-hot-rock geothermal energy, is i.e. formed a closed circulation taking thermal medium flowing by oil pipe and annular space, utilizes long level
Well shaft contacts with hot dry rock reservoir distance, and circulate in abundant heat levels well takes hot fluid, carries out underground heat and opens
Adopt.
Summary of the invention
Object of the present invention is to provide a kind of method utilizing long horizontal wells densification dry-hot-rock geothermal, the method profit
Contact by the distance of net horizontal section pit shaft with hot dry rock reservoir, make to take thermal medium and heat up, and utilize oil pipe and annular space to be formed
The circulatory system carry out self-loopa mining geothermal energy, play abundant mining geothermal energy and reduce cost effect.
The technical scheme is that a kind of method utilizing long horizontal well self-loopa exploitation fine and close dry-hot-rock geothermal energy, tool
Body step is as follows:
(1) select high temperature hot dry rock reservoir in, at hot dry rock reservoir ground region, use conventional drilling tool horizontal well drilling
Main vertical section；
(2) horizontal well vertical section bores and meets behind xeothermic rock stratum, utilizes deflecting tool directional inclination, horizontal well drilling horizontal segment,
In drilling process, geosteering drilling tool is used to control horizontal segment inclination angle and creep into distance；
(3) high heat conduction production casing under, and cement the well with high thermal conductivity coefficient mud, take in the isolation of shaft bottom lower packet simultaneously
Hot fluid directly contacts with reservoir；
(4) lower prestress insulated tubing, thus form a loop structure closed with oil jacket annular space；
(5) ground uses injection pump to inject low temperature in oil jacket annular space and takes thermal medium, uses suction pump in oil pipe simultaneously
Suction high temperature through heat exchange takes thermal medium；
(6) utilize ground heat transmission equipment, the high-temperature geothermal carried can be transferred out.
Preferably: in step (1), when horizontal well vertical section one is opened, well should be greater than 0.5m, drill bit chi during drilling well
Very little it is more than 20 feet.
Preferably: in step (1), horizontal well vertical section two spud in major part vertical section time, well should be greater than 0.3m,
During drilling well, bit size is more than 12 feet.
Preferably: in step (2), during horizontal well drilling horizontal segment, maximum possible is answered to lengthen horizontal range, so that
Obtaining pit shaft and geothermal reservoir has bigger heat exchange area, sufficient heat exchange, horizontal section length is more than 2000m.
Preferably: in step (2), kickoff point (KOP) should be more than 10m apart from hot dry rock reservoir top.
Preferably: in step (3), borehole gap opened by production casing and two is 0.01-0.03m.
Preferably: in step (3), production casing is novel highly heat-conductive material, can with geothermal reservoir sufficient heat exchange,
Sleeve pipe thermal conductivity factor is more than 107J/(m·day·K)。
Preferably: in step (3), cement mortar is novel high heat-conductive water mud, can with geothermal reservoir sufficient heat exchange,
Thermal conductivity factor is more than 106J/(m·day·K)。
Preferably: in step (4), oil pipe, by novel pre-stressed insulated tubing, is made up of novel heat insulation material, can
With the fully heat exchange of fluid between isolation oil pipe and annular space, thus playing the effect of insulation, its thermal conductivity factor is less than 2000
J/(m·day·K)。
Preferably: in step (4), insulated tubing and annular space form a loop structure closed, thus constitute and take
Thermal medium flow channel.Its self-cycle structure is much better than the U-shape structure that conventional injection-production well is constituted, have heating surface (area) (HS big,
The advantages such as heat loss area is little and economic input is few.
Preferably: in step (5), take thermal medium and can select water, it is also possible to select supercritical CO2, the most also may be used
To select other to have the fluid of excellent heat character, such as water and the compounding fluid such as ethanol or ethylene glycol.
Preferably: in step (6), it is different that difference takes thermal medium treatment measures, as compounding fluid has more sensitive
Phase-state change, can be by somewhat changing pressure so that take thermal medium and become gaseous state, thus rapidly and efficiently discharge the heat carried
Energy.
Preferably: in step (6), heat transmission equipment both can be the direct uses for geothermal energy devices such as conventional heat pump, also
Double-work medium power generation technology can be utilized to generate electricity, the most first use high temperature fluid generating, then proceed to utilize follow-up
Higher temperatures hot fluids, Multi-class propagation geothermal energy.
The invention have the benefit that 1. hot dry rock reservoir temperature is high, hardness is big, pressure break cost is high, and fracturing effect is failed to understand
Aobvious, use oil pipe of horizontal well-casing annulus circulation exploitation dry-hot-rock geothermal, not only avoid owing to fracturing fluid enters reservoir
The reservoir damage caused, it also avoid high pressure break expense, has higher economic benefit；2. long horizontal well is used to open
Adopt dry-hot-rock geothermal, it is to avoid the fluid loss problem in pressure break reservoir, connecing of pit shaft and reservoir can also be effectively increased simultaneously
Contacting surface is amassed, and improves and takes heat medium temperature；The closure of the longest horizontal well self-cycle structure is that the performance optimization taking thermal medium carries
Supply condition, i.e. on the basis of the hot physical property and Wellbore Flow heat exchange of fully research water, optimized and be applicable to the exploitation of this underground heat
Mode take thermal medium formula, improve anticorrosive and heat-exchange capacity；4. the thermal medium of taking injected follows in oil pipe-annular space
Circulation moves, and can make full use of and inject the thermal siphon phenomenon that the difference of extraction temperature produces, reduce Implantation Energy consumption, improve
The heat exchanger effectiveness of ground heat exchanger；5. take hot fluid to contact with reservoir rock, both can guarantee that heat Jie is not taken on stratum
Matter is polluted, and avoids pit shaft and the problem such as ground installation corrosion and fouling simultaneously, maintains and take the thermal capacitance of thermal medium, viscosity
Stability with the coefficient of heat conduction so that adopt thermal process process reliable and stable.
Accompanying drawing explanation
The fine and close dry-hot-rock geothermal schematic diagram of Fig. 1 long horizontal well self-loopa exploitation
Fig. 2 multiple-limb long horizontal wells densification dry-hot-rock geothermal schematic diagram.
Wherein, 1, cap rock, 2, hot dry rock reservoir, 3, surface pipe, 4, cementing concrete ring, 5, production casing, 6,
Oil pipe, 7, bottom paker, 8, horizontal well vertical section, 9, horizontal well horizontal segment.
Detailed description of the invention
Below in conjunction with the accompanying drawings the present invention is described in detail.
A kind of method utilizing long horizontal well self-loopa exploitation fine and close dry-hot-rock geothermal energy, specifically comprises the following steps that
(1) as it is shown in figure 1, choose hot dry rock reservoir 2, and use conventional tower drilling tool at ground region, use size
Open more than 20 inch drill bit one, when being drilled into topsoil, layer sleeve pipe 3, and use traditional cements to cement the well, it is used for protecting
Well head, isolates water-bearing layer, top.In drilling process, resistant to elevated temperatures drilling fluid should be used to creep into；
(2) the bit change size less drill bit two more than 12 inches is opened, and horizontal well drilling vertical section 8 bores and meets hot dry rock reservoir
After 2, and continue to creep into more than 10m, then utilize deflecting tool deflecting, horizontal well drilling horizontal segment 9, in drilling process,
Using geosteering drilling tool to control horizontal segment inclination angle and be less than 5 °, terminal level section creeps into length more than 2000m；
(3), after carrying brill, lower thermal conductivity factor is higher than 107The production casing 5 of J/ (m day K), and use thermal conductivity factor to be higher than
106J/ (m day K) high heat-conductive water mud 4 is cemented the well；
(4) by entering packer 7 under well head, after packer 7 arrives shaft bottom along production casing 5, be used for avoiding taking thermal medium with
The directly contact of reservoir rock；
(5) the thermal conductivity factor novel pre-stressed insulated tubing 6 less than 2000J/ (m day K) under, makes oil pipe 6 and oil jacket ring
One closed-loop arrangement of empty formation, thus provide and take thermal medium flow channel；
(6) open ground injection pump, be injected downwardly into low temperature taken thermal medium by oil pipe 6 and sleeve pipe 5 annular space, open ground simultaneously
Face suction pump, is aspirated high temperature by oil pipe 6 and takes thermal medium, it is achieved take thermal medium certainly following in horizontal well oil jacket annular space-oil pipe
Circulation moves, thus exploits underground heat；
(7) utilize ground heat transmission equipment, take thermal medium first with the high temperature of oil pipe 6 extraction and carry out geothermal power generation, on ground
After heat generating, continue with follow-up higher temperature takes thermal medium, carries out heat energy utilization, Multi-class propagation geothermal energy.
Flow for adopting the heat stage in annular space owing to taking thermal medium, maximum should improve sleeve pipe radius, thus increase annular space and storage
The contact area of layer.But excessive sleeve pipe radius can increase in oil pipe the flowing pressure taking thermal medium, thus causes oil pipe well
Head pressure reduces, aggravation ground injection-extraction pump power.Therefore oil pipe and sleeve pipe radius should be optimized according to being actually needed, reduction is taken
Thermal medium is kinetic energy loss in flowing.
It should be noted that during long horizontal well self-loopa exploitation dry-hot-rock geothermal, take thermal medium following in oil pipe-annular space
Ring mode is divided into direct circulation and reacting cycle mode.Wherein: oil pipe injects, and annular space extraction, for direct circulation；Annular space injects,
Oil pipe extraction, for reacting cycle.The present invention describes and carries out as a example by underground heat mining type by reacting cycle, but is not precluded from direct circulation
Underground heat mining type.
Meanwhile, the present invention is not only limited to utilize the long horizontal well self-loopa of individual well eye to exploit dry-hot-rock geothermal energy, such as Fig. 2 institute
Show, the long horizontal well of multiple-limb can be bored, utilize oil tube connection device, carry out multiple-limb long horizontal well self-loopa and carry out geothermal energy
Exploitation.In multiple-limb long horizontal well oil jacket annular space, arranging and take thermal medium distributor, Based Intelligent Control takes thermal medium at each point
Prop up the flow in well.For other geothermal reservoirs such as high temperature oil gas reservoir and die mould geothermal reservoir etc., also can use we
Method carries out underground heat exploitation.
In order to ensure the stability of hot dry rock reservoir drilling well, high temperature resistant drilling fluid drilling well should be used.Hot dry rock reservoir temperature is relatively
Height, in well, drilling fluid is owing to being chronically at hot environment, and performance, by heavy damage, directly affects hole wall and stablizes, takes rock
The problem such as ability and construction safety.At present, typical high temperature resistant drilling fluids is mainly with SMC, SMP-1, SMT and SMK
Be main, can temperature resistance 220～230 DEG C, it at high temperature can keep good rheological characteristic, have the effect of relatively low filter loss.
For proving that long horizontal well has good heat energy power of adopting, interior for a long time can run work simultaneously.With certain level well
As a example by, carry out oil pipe-annular space self-loopa water filling and adopt hot capability analysis accordingly.This horizontal well hangs down without branch well hole, main borehole
Straight section 3000m, horizontal segment 4000m.Production casing internal diameter 0.28m, production casing internal diameter 0.29m, pipe aperture 0.125
M, oil pipe external diameter 0.13m, cement sheath thickness 0.05m.Wherein cement sheath thermal conductivity factor 4.5 × 106J/ (m day K), sleeve pipe
Thermal conductivity factor 3 × 107J/ (m day K), oil pipe thermal conductivity factor 104J/(m·day·K).Remaining relevant design parameter can be shown in Table 1.
As table 1 carries out relevant adopting knowable to heat calculating, and in oil pipe-annular space, water cycle rate is 1000m3/day.Table 2 is not
It is distributed along well track annular space and bushing temperature with under the time.It can be seen that in horizontal well vertical section annular space (3000m),
Injecting water to be heated by reservoir, temperature is progressively increased to about 85 DEG C by 20 DEG C；After entering horizontal segment, high temperature hot dry rock
The water that reservoir flows in continuous heating annular space in distance, makes water temperature finally increase to about 176 DEG C.It is heated to high temperature
Water when oil pipe returns to ground, affected by annular space temperature and insulated tubing in horizontal segment, temperature declines less, only at 5 DEG C
Left and right；Being affected by lower temperature in annular space in vertical section, temperature declines relatively big, about about 20 DEG C.Underground heat exploitation 30
After it, wellhead temperature is 152.5 DEG C；Along with underground heat is persistently exploited, wellhead temperature is gradually reduced, after exploiting 3000 days,
Wellhead temperature reduces to 138.62 DEG C.Visible, heat is adopted in individual well eye oil pipe of horizontal well-annular circulation water filling, and wellhead temperature is being grown
In time, (10 years) are kept at more than 130 DEG C, carry out self-loopa exploitation hot dry rock according to the long horizontal well of multiple-limb
Geothermal energy, adopts heat energy Li Genggao, and the sustainable time is longer.
Being above a specific embodiment of the present invention, the specific embodiment of the invention can not be only limitted to this, for ability
For technical staff in territory, on the premise of without departing from thinking of the present invention, it may also be made that other similar changes, and this
It is regarded as the protection domain of technical solution of the present invention.
Table 1 horizontal well self-loopa exploitation dry-hot-rock geothermal can analyze related data
| Horizontal well vertical section, m | 3500 | Sleeve outer, m | 0.30 |
| Horizontal well horizontal segment, m | 3000 | Insulated tubing internal diameter, m | 0.076 |
| The hot dry rock degree of depth, m | 3500 | Insulated tubing external diameter, m | 0.127 |
| Surface temperature, DEG C | 25 | Cement thickness, m | 0.05 |
| Geothermal gradient, DEG C/100m | 6 | Sleeve pipe thermal capacitance, J/ (m3·K) | 3.63×106 |
| Hot dry rock temperature, DEG C | 220 | Insulated tubing thermal capacitance, J/ (m3·K) | 5×104 |
| Inject coolant-temperature gage, DEG C | 20 | Cement sheath thermal capacitance, J/ (m3·K) | 1.84×106 |
| Hot dry rock pressure, MPa | 35 | Reservoir thermal conductivity factor, J/ (m day K) | 3.02×105 |
| Waterflood injection rate, L/s | 5 | Sleeve pipe thermal conductivity factor, J/ (m day K) | 3.89×106 |
| Working time, year | 10 | Insulated tubing thermal conductivity factor, J/ (m day K) | 104 |
| Thermal sleeve internal diameter, m | 0.29 | Cement sheath thermal conductivity factor, J/ (m day K) | 1.85×106 |
Table 2 is to be distributed (DEG C) along well track annular space and bushing temperature under different time
Claims (10)
1. the method utilizing long horizontal well self-loopa exploitation fine and close dry-hot-rock geothermal energy, it is characterised in that: its concrete technology step is:
(1) select high temperature hot dry rock reservoir in, at hot dry rock reservoir ground region, use the conventional main vertical section of drilling tool horizontal well drilling；
(2), after horizontal well vertical section bores and meets xeothermic rock stratum, utilize deflecting tool directional inclination, horizontal well drilling horizontal segment, in drilling process, use geosteering drilling tool control horizontal segment inclination angle and creep into distance；
(3) high heat conduction production casing under, and cement the well with high thermal conductivity coefficient mud, take hot fluid in the isolation of shaft bottom lower packet simultaneously and contact with the direct of reservoir；
(4) lower prestress insulated tubing, thus form a loop structure closed with oil jacket annular space；
(5) ground uses injection pump to inject low temperature in oil jacket annular space and take thermal medium, and employing suction pump simultaneously is aspirated high temperature through heat exchange in oil pipe and taken thermal medium；
(6) utilize ground heat transmission equipment, the high-temperature geothermal carried can be transferred out.
The method utilizing long horizontal well self-loopa exploitation fine and close dry-hot-rock geothermal energy the most as claimed in claim 1, it is characterized in that: the present invention is not only limited to utilize the long horizontal well self-loopa of individual well eye to exploit dry-hot-rock geothermal energy, also can bore the long horizontal well of multiple-limb, utilize oil tube connection device, carry out multiple-limb long horizontal well self-loopa and carry out geothermal energy exploitation；Simultaneously in multiple-limb long horizontal well oil jacket annular space, arranging and take thermal medium distributor, Based Intelligent Control takes thermal medium flow in each branch well hole.
The method utilizing long horizontal well self-loopa exploitation fine and close dry-hot-rock geothermal energy the most as claimed in claim 1, it is characterized in that: this method is not only limited to dry-hot-rock geothermal reservoir, to other geothermal reservoirs such as high temperature oil gas reservoir and die mould geothermal reservoir etc. this method also can be used to carry out underground heat exploitation.
The method utilizing long horizontal well self-loopa exploitation fine and close dry-hot-rock geothermal energy the most as claimed in claim 1, it is characterised in that: in step (1), when horizontal well vertical section one is opened, well should be greater than 0.5m, and during drilling well, bit size is more than 20 feet；Horizontal well vertical section two spud in major part vertical section time, well should be greater than 0.3m, during drilling well bit size be more than 12 feet.
The method utilizing long horizontal well self-loopa exploitation fine and close dry-hot-rock geothermal energy the most as claimed in claim 1, it is characterized in that: in step (2), during horizontal well drilling horizontal segment, maximum possible is answered to lengthen horizontal range, so that pit shaft and geothermal reservoir have bigger heat exchange area, sufficient heat exchange, horizontal section length is more than 2000m.
The method utilizing long horizontal well self-loopa exploitation fine and close dry-hot-rock geothermal energy the most as claimed in claim 1, it is characterised in that: in step (2), kickoff point (KOP) should be more than 10m apart from hot dry rock reservoir top.
The method utilizing long horizontal well self-loopa exploitation fine and close dry-hot-rock geothermal energy the most as claimed in claim 1, it is characterised in that: in step (3), borehole gap opened by production casing and two is 0.01-0.03m.
The method utilizing long horizontal well self-loopa exploitation fine and close dry-hot-rock geothermal energy the most as claimed in claim 1, it is characterized in that: in step (4), oil pipe is by novel pre-stressed insulated tubing, it is made up of novel heat insulation material, can fully completely cut off the heat exchange of fluid between oil pipe and annular space, thus playing the effect of insulation, its thermal conductivity factor is less than 2000J/ (m day K).
The method utilizing long horizontal well self-loopa exploitation fine and close dry-hot-rock geothermal energy the most as claimed in claim 1, it is characterized in that: in step (4), insulated tubing and annular space form a loop structure closed, thus constitute and take thermal medium flow channel, its self-cycle structure is much better than the U-shape structure that conventional injection-production well is constituted, the advantage such as have that heating surface (area) (HS is big, heat loss area is little and economic input is few.
The method utilizing long horizontal well self-loopa exploitation fine and close dry-hot-rock geothermal energy the most as claimed in claim 1, it is characterised in that: take thermal medium and can select water, it is also possible to select supercritical CO2, other can also be selected to have the fluid of excellent heat character, such as water and the compounding fluid such as ethanol or ethylene glycol simultaneously.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610231296.7A CN105909214A (en) | 2016-04-14 | 2016-04-14 | Method for exploiting compact dry heat rock geothermal energy by utilizing long horizontal well self-circulation structure |
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