CN105696996B - A kind of method of construction of the artificial heat storage of dry-hot-rock geothermal - Google Patents
A kind of method of construction of the artificial heat storage of dry-hot-rock geothermal Download PDFInfo
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- 239000011435 rock Substances 0.000 title claims abstract description 112
- 238000005338 heat storage Methods 0.000 title claims abstract description 49
- 238000010276 construction Methods 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 30
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 62
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 31
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 31
- 208000035126 Facies Diseases 0.000 claims abstract description 6
- 239000011229 interlayer Substances 0.000 claims abstract description 4
- 238000002347 injection Methods 0.000 claims description 36
- 239000007924 injection Substances 0.000 claims description 36
- 238000005553 drilling Methods 0.000 claims description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 22
- 239000010410 layer Substances 0.000 claims description 18
- 230000035699 permeability Effects 0.000 claims description 12
- 230000015572 biosynthetic process Effects 0.000 claims description 11
- 238000012360 testing method Methods 0.000 claims description 10
- 230000000694 effects Effects 0.000 claims description 9
- 238000004458 analytical method Methods 0.000 claims description 7
- 230000005611 electricity Effects 0.000 claims description 7
- GCNLQHANGFOQKY-UHFFFAOYSA-N [C+4].[O-2].[O-2].[Ti+4] Chemical compound [C+4].[O-2].[O-2].[Ti+4] GCNLQHANGFOQKY-UHFFFAOYSA-N 0.000 claims 1
- 238000009792 diffusion process Methods 0.000 abstract description 3
- 239000012530 fluid Substances 0.000 description 4
- 230000001351 cycling effect Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 230000035882 stress Effects 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 230000011218 segmentation Effects 0.000 description 2
- 241000790917 Dioxys <bee> Species 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000010438 granite Substances 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000009972 noncorrosive effect Effects 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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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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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/30—Specific pattern of wells, e.g. optimising the spacing of wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or 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
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Abstract
A kind of method of construction of the artificial heat storage of dry-hot-rock geothermal, belong to the artificial heat storage construction applications of dry-hot-rock geothermal, the Weak face or interlayer formed along Igneous rock facies carries out supercritical carbon dioxide pressure break and generates major fracture, and then the hydraulic fracturing that huge discharge is carried out in major fracture generates secondary rupture, dry-heat rock body form of the rupture of generating body product or the rupture of clump formula in the case where recycle pressure break builds the technical solution of the method that artificial heat is stored up.It the advantage is that the low viscosity for making full use of supercritical carbon dioxide and easily diffusion, and igneous rock fracture pressure under supercritical carbon dioxide pressure break is low, it is easily formed the feature in crack, there is apparent lithofacies structure in conjunction with igneous rock, it is easy to the characteristics of generating thermal fracture, solving current hydraulic fracturing should not implement in the artificial heat storage of deep rock mass is built, and fracture pressure is big, it is difficult to form the fracture swarm of ideal structure or slit band, artificial heat reservori is particularly difficult to the problem of building.
Description
Technical field
It is the invention belongs to the artificial heat storage construction applications of dry-hot-rock geothermal, in particular to a kind of along the natural of Igneous rock facies formation
Plane of weakness and weak intercalated layer carry out supercritical carbon dioxide pressure break and generate major fracture, and then the waterpower of huge discharge is carried out in major fracture
Pressure break generates secondary rupture, and dry-heat rock body form of the rupture of generating body product or the rupture of clump formula in the case where recycling pressure break is artificial to build
The method of heat storage.
Background technique
Underground heat is determined as maintaining the new of social sustainable development as green, reproducible resource, by countries in the world
" green energy resource ", geothermal energy resources can be divided into two types: natural thermal water resource and dry-hot-rock geothermal resource (Hot Dry Rock
Geothermal Energy(HDR)).Dry-hot-rock geothermal stock number within whole world earth's crust 10km is 40-400Mquads
(1quad=1019J), it is 100-1000 times of fossil energy, almost can be described as unlimited stock number, and be distributed quite general
Time.Dry-hot-rock geothermal generally refers to the geothermal energy resource that temperature is contained in 200 DEG C or more of rock mass, can pass through man-made recovery
Directly overheated steam is extracted from rock mass and is directly used in power generation and thermal water utilization.It is developed and utilized in dry-hot-rock geothermal
In, the heat exchange area formed in the rock stratum of certain depth between two wells or group wells is larger and the slit band of cranny development or
Person crack group is exactly artificial heat storage.The step of construction of artificial heat storage is high heat rock mass geothermal exploitation most critical, artificial heat storage are built
The quality made is directly related to the success or failure of dry-hot-rock geothermal exploitation.
Rock stratum where manually heat storage is built has the following characteristics that (1) is buried relatively deeply, generally in igneous rock or metamorphic rock
In, depth is more than the 3000m of underground；(2) igneous lithofacies have apparent lithofacies, are easy at the rock mass interface of different lithology
Form natural plane of weakness or weak intercalated layer, igneous rock of the mechanical characteristic different from normal condition；(3) temperature is higher in rock stratum, temperature
At 200-650 DEG C；(4) dry-heat rock body primary porosity is extremely low, and permeability is very poor.Therefore, the construction of the artificial heat storage of hot dry rock is non-
It is often difficult.Currently, building the technology and methods of artificial heat storage has hydrofracturing method, explosion method, thermal stress method etc., but it is everybody
Generally acknowledged method is huge hydraulic fracturing.However huge hydraulic fracturing is built when artificial heat is stored up and still suffers from many difficulties,
Due to rock mass stress height, so rock masses fracturing pressure is big, it is difficult to form the fracture swarm or slit band of ideal structure, that builds up is artificial
The flow of heat reservori is lower than the parameter request of comercial operation.
Supercritical carbon dioxide, which refers to the temperature of CO 2 fluid, pressure, to be more than 31.1 DEG C of fluid critical-temperature and faces
A kind of state of boundary pressure 7.4MPa.Supercritical carbon dioxide have gas low viscosity and easily diffusion, liquid high density and
Diffluent feature, and CO_2 Resource is sufficient, at low cost, chemical inertness is nontoxic non-corrosive, and critical state is easy real
Existing, this provides good material guarantee for the application of supercritical carbon dioxide fluid.Supercritical carbon dioxide fracturing technique quilt
It is increasingly used in the permeability transformation aspect of low-permeability rock mass.China uses pure liquid carbon dioxide for the first time within 2013
In " prolonging 7 well of page " live crushing test success, also to use supercritical carbon dioxide pressure break to provide the feasibility case at scene.
Known to complex laboratory research conclusion: supercritical carbon dioxide pressure break, rock masses fracturing pressure are low compared with hydraulic fracturing；Condition of high temperature fire
Diagenesis meets the rupture of aquatic products heat, permeability enhancing.
Therefore, using at igneous rock lithofacies the characteristics of Weak face or interlayer easy to form, in conjunction with supercritical carbon dioxide pressure
It is low to split rock masses fracturing pressure, condition of high temperature igneous rock meets the water capacity and is also easy to produce thermal fracture, can lure with supercritical carbon dioxide pressure break
Dry-heat rock body is set to generate major fracture, carrying out hydraulic fracturing along the major fracture of formation can make dry-heat rock body generate secondary rupture, instead
Multiple circulation carries out, and dry-heat rock body forms volume rupture or the rupture of clump formula under temperature difference and frac pressure collective effect, it is ensured that
Have sufficiently large heat exchange area between heat transport fluid and hot dry rock, build artificial heat storage have longer service life with it is larger
Power output.
Summary of the invention
Present invention aims to overcome that hydraulic fracturing shortcoming and deficiency present in the artificial heat storage construction of dry-hot-rock geothermal,
It is open a kind of abundant according to the structure feature that there is the natural plane of weakness and weak intercalated layer that are formed by lithofacies in igneous rock geologic structure
The method of the artificial heat storage of dry-hot-rock geothermal is built using the geological structure characteristic.
The present invention adopts the following technical scheme that realization: a kind of method of construction of the artificial heat storage of dry-hot-rock geothermal:
The area of geothermal anomaly of delineation selectes dry-hot-rock geothermal developing zone, using wellbore construction formation geology configuration data obtained,
It is identified and is analyzed by geology, determine the position of the natural plane of weakness that Igneous rock facies are formed and weak intercalated layer structure, and draw geology
Sectional view carries out supercritical carbon dioxide pressure break then along the natural Weak face structure that Igneous rock facies are formed and generates major fracture,
After the major fracture perforation between group wells, secondary pressure is carried out in the major fracture between group wells using the hydraulic fracture mode of huge discharge
It splits, high-temperature rock stratum generates volume rupture or clump formula ruptures under temperature difference and the collective effect of hydraulic pressure, in igneous rock stratum or fiery
Diagenesis interlayer crack is mutually lapped to form Fracture Networks, formed a permeability compared with strong, the biggish fracture swarm of heat exchange area or
Slit band realizes the construction of the artificial heat storage of high heat rock mass underground heat.
The step of it is embodied are as follows:
(1) dry-hot-rock geothermal developing zone is selected in the area of geothermal anomaly of delineation carry out well group arrangement, the arrangement side of well group
Formula is in quadrangle, pentagon or hexagon, is generally made of 5 to 7 mouthfuls of drilling wells；
(2) injection well of construction center starts when wellbore construction to temperature is 180 DEG C or more of rock stratum first
Coring, producing well of then successively constructing, test temperature and core-drilling；
(3) geology identification and analysis are carried out to the core of acquirement, determines the weak structural face or soft layer formed by lithofacies
Position and thickness in rock stratum, and draw its log sheet；
(4) according to the log sheet drawn, weak structural face or soft layer between well group carry out overcritical dioxy
Change carbon staged fracturing, until all generating major fracture between drilling wells all in group wells；
(5) secondary fracturing is carried out between group wells using the hydraulic fracturing mode of huge discharge in major fracture, since flow is big, meeting
Formation temperature is poor in the rock mass around major fracture, and major fracture generates secondary rupture zone under temperature difference and hydraulic pressure collective effect,
Volume rupture or the rupture of clump formula are gradually formed in rock mass；
(6) supercritical carbon dioxide pressure break and hydraulic fracturing iterative cycles pressure break are carried out to drilling wells all in group wells, until
Major fracture in rock stratum is mutually lapped with the crack that secondary rupture generates and be connected to, formed a permeability relatively by force, heat exchange area
Biggish fracture swarm or slit band；
(7) a large amount of water at low temperature is injected from injection well obtain source from producing well after fracture swarm or slit band heat exchange
The continuous overheated steam in source or high-temperature water are for generating electricity.
A kind of method of construction of the artificial heat storage of above-mentioned dry-hot-rock geothermal, in the step (1), well group center is injection well,
Impartial being arranged in using injection well of producing well is the center of circle, L on the circumference of radius, the distance L=500- of injection well to producing well
1000m。
A kind of method of construction of the artificial heat storage of above-mentioned hot dry rock in the step (3), is carrying out geology to the core of acquirement
Identification and analysis, determine the type of rock stratum, the position of weak structural face or soft layer and its thickness, and draw log sheet
Afterwards, by Rock Mechanics Test, the vertical tensile strength sigma of fracturing section rock is measuredt。
The method of construction of the artificial heat storage of above-mentioned a kind of hot dry rock, in the step (4), along weak structural face or weakness
When carrying out supercritical carbon dioxide staged fracturing at layer, height of lift is determined according to its depth of stratum, generally 2-4m.
A kind of method of construction of the artificial heat storage of above-mentioned hot dry rock in the step (4) (5) (6), carries out overcritical titanium dioxide
When carbon pressure is split with hydraulic fracturing, the temperature of the carbon dioxide of injection is room temperature, and the temperature of water is room temperature or room temperature hereinafter, pressure break pressure
Power P is controlled in the vertical crustal stress σ of fracturing stratumvCrustal stress σ vertical with fracturing stratumvWith the vertical tensile strength sigma of rocktThe sum of
Between, i.e. σv﹤ P ﹤ σv+σt, room temperature refers generally to 20 DEG C in this field.
A kind of method of construction of the artificial heat storage of above-mentioned hot dry rock, in the step (6), the permeability built up is relatively strong, heat
The volume v=π L of the biggish fracture swarm of exchange area or slit band2The effective volume of H, the artificial heat storage of formation are V=n π L2H,
H is fracturing section height in formula, and n is the coefficient of efficiency of artificial heat storage, and L is the distance between producing well and injection well.
A kind of the advantages of method of construction of the artificial heat storage of hot dry rock of the present invention, is: making full use of supercritical carbon dioxide
Low viscosity and easy diffusion and igneous rock fracture pressure under supercritical carbon dioxide pressure break are low, are easily formed the feature in crack,
There is apparent lithofacies structure in conjunction with igneous rock, be easy to the characteristics of generating thermal fracture, solve current hydraulic fracturing in deep rock mass
Artificial heat storage should not be implemented in building, and fracture pressure is big, it is difficult to form the fracture swarm or slit band of ideal structure, artificial heat reservori
It is particularly difficult to the problem of building.
Detailed description of the invention
Fig. 1 is group wells well group " quadrangle " arrangement figure.
Fig. 2 is group wells well group " pentagon " arrangement figure.
Fig. 3 is group wells well group " hexagon " arrangement figure.
Fig. 4 is that artificial heat storage forming process is shown under supercritical carbon dioxide pressure break and the hydraulic fracturing circulation pressure break of huge discharge
It is intended to.
In figure: 1- injection well, 2- producing well, weak structural face or soft layer at 3- lithofacies, 4- major fracture, 5- bis- times ruptures
Area.
Specific embodiment
Embodiment 1: it as shown in Fig. 1,4, is intended to want in depth using the method for the present invention in the area of geothermal anomaly that one is drawn a circle to approve
The built-in work heat storage that makes children in xeothermic rock stratum at degree 2000m, well group are arranged as shown in Figure 1, the distance of injection well 1 to producing well 2 is
1000m, artificial heat reservori is built up come into operation after, a large amount of normal-temperature water is injected from injection well 1, by artificial heat reservori heat exchange
Afterwards, 200 DEG C or more overheated steams or high-temperature water are obtained for generating electricity from producing well 2.
Specific step is as follows:
(1) dry-hot-rock geothermal developing zone is selected in the area of geothermal anomaly of delineation and carry out " quadrangle " well group arrangement, such as scheme
1, well group is made of 5 mouthfuls of drilling wells, and injection well 1 is located at center, and 4 mouthfuls of producing wells 2 are evenly distributed on the circumference with injection well 1 for the center of circle
On, the distance between producing well 1 and injection well 2 are 1000m；
(2) injection well 1 of constructing first, through precise measurement, determines xeothermic rock stratum temperature when wellbore construction is to 2000m depth
Degree is 250 DEG C, is met the requirements, and boring and coring is started, then successively construct producing well 2, test temperature and core-drilling；
(3) geology identification and analysis are carried out to the core of acquirement, there are granite and basalt to be formed at 2010m for discovery
Lithofacies structure, and draw its log sheet, rock mechanics experiment carried out to the core obtained from this drilling section, finds its power
Differ markedly from other sections, the tensile strength sigma of rockt=8-10MPa, thickness have 10m；
(4) it according to the log sheet drawn, is carried out in 2010m depth weak structural face or soft layer 3 overcritical
Carbon dioxide staged fracturing, frac pressure are P=50.25-60.25MPa, height of lift 2m, divide 5 sections, carry out from bottom to top
Pressure break, until all generating major fracture 4 between drilling wells all in group wells；
(5) secondary fracturing, frac pressure P=are carried out between group wells using the hydraulic fracturing mode of huge discharge in major fracture 4
50.25-60.25MPa are continued cycling through 5-10 days, major fracture 4 is in temperature difference after hydraulic fracturing perforation between group wells in group wells
With secondary rupture zone 5 is generated under hydraulic pressure collective effect, gradually formed in rock mass volume rupture or clump formula rupture；
(6) supercritical carbon dioxide pressure break and hydraulic fracturing iterative cycles pressure break are carried out to drilling wells all in group wells, until
Major fracture 4 in rock stratum is mutually lapped with the crack of secondary rupture zone 5 to be connected to, and the artificial heat storage of ideal structure is formed.It is built up
Permeability compared with the volume of strong, the biggish fracture swarm of heat exchange area or slit band be 3140 ten thousand steres, artificial heat storage has
Effect coefficient takes 0.8, and the effective volume of the artificial heat storage of formation is 2512 ten thousand steres, meets design requirement；
(7) a large amount of water at low temperature is injected from injection well 1, after fracture swarm or slit band heat exchange, is obtained from producing well 2
230 DEG C of overheated steam or high-temperature water is for generating electricity.
Embodiment 2: it as shown in Figure 2,4, is intended to want in depth using the method for the present invention in the area of geothermal anomaly that one is drawn a circle to approve
The built-in work heat storage that makes children in xeothermic rock stratum at degree 3000m, well group are arranged as shown in Fig. 2, the distance of injection well 1 to producing well 2 is
750m, artificial heat reservori is built up come into operation after, a large amount of normal-temperature water is injected from injection well 1, by artificial heat reservori heat exchange
Afterwards, 200 DEG C or more overheated steams or high-temperature water are obtained for generating electricity from producing well 2.
Specific step is as follows:
(1) dry-hot-rock geothermal developing zone is selected in the area of geothermal anomaly of delineation and carry out " pentagon " well group arrangement, such as scheme
2, well group is made of 6 mouthfuls of drilling wells, and injection well 1 is located at center, and 5 mouthfuls of producing wells 2 are evenly distributed on the circumference with injection well 1 for the center of circle
On, the distance between producing well 1 and injection well 2 are 750m；(2) first construct injection well 1, when wellbore construction to 2900m depth
When, through precise measurement, determines that xeothermic rock temperature is 300 DEG C, meet the requirements, start boring and coring, then successively construction production
Well 2, test temperature and core-drilling；(3) geology identification and analysis are carried out to the core of acquirement, discovery has flower at 2950m
The lithofacies structure that Gang Yan and basalt are formed, and its log sheet is drawn, rock is carried out to the core obtained from this drilling section
Mechanical test finds that its mechanics differs markedly from other sections, the tensile strength sigma of rockt=10-12MPa, thickness have 8m；(4) root
According to the log sheet drawn, supercritical carbon dioxide segmentation pressure is carried out in 2950m depth weak structural face or soft layer 3
It splits, frac pressure is P=73.75-85.75MPa, height of lift 2m, divides 4 sections, pressure break is carried out from bottom to top, until group wells
Major fracture 4 is all generated between interior all drilling wells；(5) it is carried out in major fracture 4 between group wells using the hydraulic fracturing mode of huge discharge
Secondary fracturing, frac pressure P=73.75-85.75MPa continue cycling through 5- after hydraulic fracturing perforation between group wells in group wells
10 days, major fracture 4 generated secondary rupture zone 5 under temperature difference and hydraulic pressure collective effect, gradually formed in rock mass volume rupture or
Person's clump formula rupture；(6) supercritical carbon dioxide pressure break and hydraulic fracturing iterative cycles pressure break are carried out to drilling wells all in group wells, directly
Major fracture 4 in rock stratum is mutually lapped with the crack of secondary rupture zone 5 to be connected to, and the artificial heat storage of ideal structure is formed.It is built
At permeability compared with the volume of strong, the biggish fracture swarm of heat exchange area or slit band be 1413 ten thousand steres, artificial heat storage
Coefficient of efficiency takes 0.85, and the effective volume of the artificial heat storage of formation is 1201 ten thousand steres；(7) it is injected largely from injection well 1
Water at low temperature obtains 280 DEG C of overheated steam from producing well 2 or high-temperature water is used for after fracture swarm or slit band heat exchange
Power generation.
Embodiment 3: it as shown in Figure 3,4, is intended to want in depth using the method for the present invention in the area of geothermal anomaly that one is drawn a circle to approve
The built-in work heat storage that makes children in xeothermic rock stratum at degree 4000m, well group are arranged as shown in Figure 1, the distance of injection well 1 to producing well 2 is
500m, artificial heat reservori is built up come into operation after, a large amount of normal-temperature water is injected from injection well 1, by artificial heat reservori heat exchange
Afterwards, 200 DEG C or more overheated steams or high-temperature water are obtained for generating electricity from producing well 2.
Specific step is as follows:
(1) dry-hot-rock geothermal developing zone is selected in the area of geothermal anomaly of delineation and carry out " hexagon " well group arrangement, such as scheme
3, well group is made of 7 mouthfuls of drilling wells, and injection well 1 is located at center, and 6 mouthfuls of producing wells 2 are evenly distributed on the circumference with injection well 1 for the center of circle
On, the distance between producing well 1 and injection well 2 are 500m；(2) first construct injection well 1, when wellbore construction to 3950m depth
When, through precise measurement, determines that xeothermic rock temperature is 400 DEG C, meet the requirements, start boring and coring, then successively construction production
Well 2, test temperature and core-drilling；(3) geology identification and analysis are carried out to the core of acquirement, discovery has flower at 4000m
The lithofacies structure that Gang Yan and basalt are formed, and its log sheet is drawn, rock is carried out to the core obtained from this drilling section
Mechanical test finds that its mechanics differs markedly from other sections, the tensile strength sigma of rockt=10-15MPa, thickness have 12m；(4)
According to the log sheet drawn, supercritical carbon dioxide segmentation is carried out in 4000m depth weak structural face or soft layer 3
Pressure break, frac pressure are P=100-115MPa, height of lift 3m, divide 4 sections, pressure break are carried out from bottom to top, until in group wells
Major fracture 4 is all generated between all drilling wells；(5) two are carried out in major fracture 4 between group wells using the hydraulic fracturing mode of huge discharge
Secondary pressure break, frac pressure P=100-115MPa are continued cycling through 5-10 days after hydraulic fracturing perforation between group wells in group wells,
Major fracture 4 generates secondary rupture zone 5 under temperature difference and hydraulic pressure collective effect, and volume rupture or clump formula are gradually formed in rock mass
Rupture；(6) supercritical carbon dioxide pressure break and hydraulic fracturing iterative cycles pressure break are carried out to drilling wells all in group wells, until rock stratum
Interior major fracture 4 is mutually lapped with the crack of secondary rupture zone 5 and is connected to, and forms the artificial heat storage of ideal structure.The infiltration built up
Permeability is 942 ten thousand steres compared with the volume of strong, the biggish fracture swarm of heat exchange area or slit band, the coefficient of efficiency of artificial heat storage
0.95 is taken, the effective volume of the artificial heat storage of formation is 894.9 ten thousand steres, meets design requirement；(7) it is injected from injection well 1
A large amount of water at low temperature obtains 380 DEG C of overheated steam or high temperature from producing well 2 after fracture swarm or slit band heat exchange
Water is for generating electricity.
Claims (6)
1. a kind of method of construction of the artificial heat storage of dry-hot-rock geothermal, it is characterised in that: selected in the area of geothermal anomaly of delineation xeothermic
Rock geothermal exploitation region is identified and is analyzed by geology using wellbore construction formation geology configuration data obtained, determines fire
The position of weak structural face or soft layer that Diagenetic Facies are formed, and log sheet is drawn, it is formed then along Igneous rock facies
Weak structural face or soft layer carry out supercritical carbon dioxide staged fracturing and generate major fracture, to the major fracture perforation between group wells
Afterwards, secondary fracturing is carried out in the major fracture using huge discharge hydraulic fracture mode between group wells, high-temperature rock stratum is in temperature difference and water
Under the collective effect of pressure, generates volume rupture or clump formula ruptures, in igneous rock stratum or igneous rock interlayer crack is mutually lapped shape
At Fracture Networks, a permeability is formed compared with strong, the biggish fracture swarm of heat exchange area or slit band, realizes high heat rock mass underground heat
The construction of artificial heat storage,
The step of it is embodied are as follows:
(1) dry-hot-rock geothermal developing zone being selected in the area of geothermal anomaly of delineation and carrying out well group arrangement, the arrangement of well group is in
Quadrangle, pentagon or hexagon are generally made of 5 to 7 mouthfuls of drilling wells；
(2) injection well (1) of construction center starts to take when wellbore construction to temperature is 180 DEG C or more of rock stratum first
Core is then successively constructed producing well (2), test temperature and core-drilling；
(3) geology identification and analysis are carried out to the core of acquirement, determines that the weak structural face formed by lithofacies or soft layer (3) exist
Position and thickness in rock stratum, and draw its log sheet；
(4) according to the log sheet drawn, weak structural face or soft layer (3) between well group carry out overcritical titanium dioxide
Carbon staged fracturing, until all generating major fracture (4) between drilling wells all in group wells；
(5) secondary fracturing, since flow is big, meeting are carried out between group wells using the hydraulic fracturing mode of huge discharge in major fracture (4)
Formation temperature is poor in the rock mass around major fracture (4), and major fracture (4) generates secondary broken under temperature difference and hydraulic pressure collective effect
Split plot (5) gradually forms volume rupture or the rupture of clump formula in rock mass；
(6) supercritical carbon dioxide staged fracturing and hydraulic fracturing are carried out to drilling well iterative cycles all in group wells, until rock stratum
Interior major fracture (4) is mutually lapped with the crack of secondary rupture zone (5) to be connected to, and forms that a permeability is relatively strong, heat exchange area
Biggish fracture swarm or slit band；
(7) a large amount of water at low temperature is injected from injection well (1) to obtain after fracture swarm or slit band heat exchange from producing well (2)
Endlessly superheated vapour or high-temperature water are for generating electricity.
2. a kind of method of construction of the artificial heat storage of dry-hot-rock geothermal described in accordance with the claim 1, it is characterised in that: the step
(1) in, well group center is injection well (1), and impartial being arranged in using injection well (1) of producing well (2) is the center of circle, L as the circle of radius
The numberical range of Zhou Shang, the distance L of injection well (1) to producing well (2) are 500-1000m.
3. a kind of method of construction of the artificial heat storage of dry-hot-rock geothermal described in accordance with the claim 1, it is characterised in that: the step
(3) in, geology identification and analysis are being carried out to the core of acquirement, determining the type of rock stratum, weak structural face or soft layer (3)
Position and its thickness, and after drawing log sheet, pass through Rock Mechanics Test, measures the vertical tensile strength of fracturing section rock
σt。
4. a kind of method of construction of the artificial heat storage of dry-hot-rock geothermal described in accordance with the claim 1, it is characterised in that: the step
(4) in, along at weak structural face or soft layer (3) carry out supercritical carbon dioxide staged fracturing when, height of lift according to
Its depth of stratum determines, generally 2-4m.
5. a kind of method of construction of the artificial heat storage of dry-hot-rock geothermal described in accordance with the claim 1, it is characterised in that: the step
(4) in (5) (6), when carrying out supercritical carbon dioxide staged fracturing and hydraulic fracturing, the temperature of the carbon dioxide of injection is normal
Temperature, the temperature of water are room temperature or room temperature hereinafter, frac pressure P is controlled in the vertical crustal stress σ of fracturing stratumvIt is vertical with fracturing stratum
Crustal stress σvWith the vertical tensile strength sigma of rocktThe sum of between, i.e. σv﹤ P ﹤ σv+σt。
6. a kind of method of construction of the artificial heat storage of dry-hot-rock geothermal described in accordance with the claim 1, it is characterised in that: the step
(6) in, the permeability built up is compared with strong, the biggish fracture swarm of heat exchange area or the volume v=π L of slit band2H, the people of formation
The effective volume of work heat storage is V=n π L2H, H is fracturing section height in formula, and n is the coefficient of efficiency of artificial heat storage, and L is producing well
The distance between injection well.
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6668554B1 (en) * | 1999-09-10 | 2003-12-30 | The Regents Of The University Of California | Geothermal energy production with supercritical fluids |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103362442B (en) * | 2012-03-30 | 2016-01-13 | 刘洪斌 | Drilling well multiple spot communication loop gathers geothermal method |
| CN204252967U (en) * | 2014-11-28 | 2015-04-08 | 吉林大学 | Hot dry rock multi cycle heating system |
| CN104675360B (en) * | 2014-12-22 | 2017-03-29 | 中国石油大学(华东) | Note supercritical CO2The pre- antiseep technique of exploitation dry-hot-rock geothermal |
-
2016
- 2016-01-29 CN CN201610064672.8A patent/CN105696996B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6668554B1 (en) * | 1999-09-10 | 2003-12-30 | The Regents Of The University Of California | Geothermal energy production with supercritical fluids |
Non-Patent Citations (1)
| Title |
|---|
| "中国CO2 地质封存及增强地热开采一体化的";谢和平等;《岩石力学与工程学报》;20140131;第33卷(第1期);第3077-3084页 * |
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