CN103090571A - Method of circular mining geothermal resources - Google Patents
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- CN103090571A CN103090571A CN2013100039488A CN201310003948A CN103090571A CN 103090571 A CN103090571 A CN 103090571A CN 2013100039488 A CN2013100039488 A CN 2013100039488A CN 201310003948 A CN201310003948 A CN 201310003948A CN 103090571 A CN103090571 A CN 103090571A
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Abstract
The invention relates to a method of circular mining geothermal resources. The method comprises following steps: (1) an area with a relatively-high geothermal gradient is confirmed; (2) a reservoir stratum in the area with the relatively-high geothermal gradient is confirmed; (3) well positions of two wells are confirmed along a main extending direction of the reservoir stratum, well drilling is conducted, one well is arranged on a relatively-low position of the reservoir stratum and is a water inlet well, and the other well is arranged on a relatively-high position of the reservoir stratum and is a water outlet well; (4) the water inlet well and the water outlet well are all drilled on the reservoir stratum, then perforation is conducted on the same reservoir stratum segment, a reservoir stratum channel is obtained, and the water inlet well is communicated with the water outlet well through the reservoir stratum; (5) on the ground, ground surface fresh water is injected from the water inlet well, the ground surface fresh water passes through the reservoir stratum channel, then hot water after heated is obtained, hot water after heated flows into the water outlet well, and then the hot water is sent to the water outlet well.
Description
Technical field
The present invention relates to a kind of method of the exploitation geothermal energy resources that circulate.
Background technology
" underground heat " refers to the abbreviation that is imbedded in underground heat resource that can utilize for the mankind economically.The thermal field of the earth also claims temperature field or the geothermal field of the earth, and the electric field of it and the earth, gravitational field, magnetic field etc. are all the physical fields of the earth.Geothermal field represents the distribution of temperature in each layer of earth interior.Each ring layer temperature distribution state of the earth and the feature of thermal field are different.Usually said thermal field refers to the part that earth upper strata can directly measure.
Geothermal energy resources cause the attention of countries in the world already as a kind of new forms of energy.Geothermal energy resources are natural resources of a kind of preciousness, have the people once to do following estimation, and the total amount of underground heat energy is about 100,000,000 7 thousands of times that whole coal reserves can releasable energy.Geothermal energy resources not only can provide heat energy, but also resource of water supply and mineral resources can be provided, as extracting useful element and compound.The geothermal energy resources of China are abundant, are to develop in the world one of country the earliest.
At present, China is mainly reflected in the following aspects with heat, i.e. the aspects such as industry heating, industrial or agricultural heat, family's heating, bathing, chamber planting, cultivation.And the present heat supply of China is mainly coal, electricity and part underground heat, and electricity is except water power, wind-powered electricity generation, solar electrical energy generation, and main still coal is electric.
Show according to Ministry of Construction's statistics of 2010, present national heat supply heating power consumption is about 2.5 hundred million tons of coals the whole year, accounts for 10% of whole society's total energy consumption.From " clean and effective coal fired power generation technological cooperation net " 2010 can information show, China's power generation and heat supply accounts for 50% left and right of national coal production total amount with coal at present.Because coal is the high pollution energy, approximately the SO2 in the whole nation 90% discharging is produced by the coal electricity, and 80% CO2 discharge capacity is by the discharging of coal electricity.When offering convenience to people's production, life, also produce larger pollution, bring harm for people's life and health.Simultaneously, coal fired boiler belongs to high-pressure bottle, and improper use also can produce the danger such as blast.
By present development of exploitation level estimation, the whole nation can develop approximately 68.45 billion cubic meters of GEOTHERMAL WATER total amount every year, amounts to the caloric value of annual 3284.8 ten thousand tons of standard coals.But what be utilized now is less than 20%.Even so, due to long-term blindly exploitation, cause and use unreasonablely, fully utilize lowly, waste comparatively serious.Some place, well spacing is unreasonable, density is too large because the shortage management causes, and it is excessive to exploit, and causes the underground heat water level significantly to descend.A large amount of GEOTHERMAL WATER arbitrarily is discharged in environment, will cause the pollution of surface water and fresh groundwater.
Our earth of life is a huge low heat reservoir, thick one deck of underground 10 kms only, and quantity of heat storage just reaches 1.05 * 1026 joules, is equivalent to the heat that 9.95 * 1015 standard coals discharge.According to Sang Hashi (SEMHACH) company introduction of being engaged in the geothermal energy research and development, the reserves of geothermal energy have surpassed coal, reserves.
Geothermal energy resources are parts of mineral resources, compare with the fossil energy that coal, oil and natural gas etc. are traditional, and geothermal energy has cleaning, environmental protection, can directly take on the spot, the advantages such as cost is relatively low, price steadiness.Because the natural heat of containing at earth interior---the geothermal energy storage capacity is huge, little to the negative effect of environment, be known as renewable and clean energy resource by countries in the world, classified as one of new forms of energy of primary study exploitation by various countries.
Present geothermal utilization comprises generating and heat utilization dual mode.Geothermal energy resources can be divided into three kinds according to the temperature regime of medium: high temperature (greater than 150 ℃), middle temperature (90～150 ℃), low temperature (less than 90 ℃) system.Mode (as: heating, balneation, the use aspect industrial or agricultural etc.) and earth source heat pump heat supply, refrigeration that middle low temperature geothermal system major part is taked directly to utilize develop and utilize; The high-temperature geothermal system is used for generating electricity, and the geothermal power generation installed capacity has reached 1,000 ten thousand kilowatts, can say, underground heat is reality and the most competitive new forms of energy the most that are only second to wind energy at present.
Ministry of Land and Resources data show, according to preresearch estimates, national major sedimentary basin is 2000 meters geothermal energies with interior storage far from the earth's surface, are equivalent to the heat of 2,500 hundred million tons of standard coals.The whole nation is through formally reconnoitring and be 103 places through the geothermal field that land departments is examined, but be 33283 ten thousand steres fief thermal resource amount every year of submission; Geothermal field through preliminary assessment is 214 places.By present development of exploitation level estimation, the whole nation can develop approximately 68.45 billion cubic meters of GEOTHERMAL WATER total amount every year, amounts to the caloric value of annual 3284.8 ten thousand tons of standard coals.But what be utilized now is less than 20%, and exploitation prospect is wide.
Present technology faces two problems:
The one, utilize coal to produce severe contamination, and cost is higher, conservative by 500 yuan of calculating per ton annual the total with 1,000,000,000 tons, coal (comprising the coal power generation heating), be 5,000 hundred million yuan;
The 2nd, utilize underground heat just from underground hot water taking, although and underground hot water amount is larger, restriction is also arranged.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of method of saving the circulation exploitation geothermal energy resources of a large amount of coal resources.
The technical scheme that the present invention solves the problems of the technologies described above is as follows: a kind of method of the exploitation geothermal energy resources that circulate comprises the following steps:
1) determine an area that geothermal gradient is relatively high;
Collect this area's underground heat data in the past, the Temperature Datum of the actual measurement of particularly digging a well is to determine the geothermal gradient of this area.Underground, if geothermal gradient is 4 ℃/100 meters, generally surface temperature is 15 ℃, and two kms just can reach 95 ℃ so, and three kms just can reach 135 ℃.Be specially:
(1) measure the terrestrial heat flow value of this area.
Terrestrial heat flow value is a comprehensive parameters, is a physical quantity of the hot situation of only reflection crust deep part that can directly record on the earth's surface.
(2) measure the geothermal gradient of this area.Underground temperature regime is directly to measure by the ground temperature of boring and mine to try to achieve, and after beating completion, with the well logging of the ground temperature in geophysical log, records temperature corresponding to different depth, and the temperature of every 100 meters increases is exactly geothermal gradient.
Geothermal gradient claims again " geothermic gradient ".The parameter of expression earth interior non-uniform temperature distributed degrees.The general buried depth more temperature value of depths is higher, represents with ℃ number that increases on every hundred meters vertical depths.Different location geothermal gradient value is different, is generally (1～3) ℃/hundred meters, and volcanic area is higher.
2) determine the reservoir in described geothermal gradient relatively high area.
3) determine the well location of two mouthfuls of wells and carry out drilling well at the main bearing of trend of described reservoir, the position that a bite well is relatively low in the reservoir is inlet well; The position that another mouthful well is relatively high in the reservoir is wet well;
4) described inlet well and wet well are all got into the place, reservoir, and then carry out perforation at same reservoirs, obtain the reservoir passage, make described inlet well communicate with described wet well by the reservoir passage;
5) on ground, inject earth's surface fresh water from described inlet well, earth's surface fresh water is through the reservoir passage, the hot water after being heated, the hot water after described heating flows into wet well, and then delivers to the water outlet well head and get final product.
The invention has the beneficial effects as follows:
1, the underground heat reservoir of being used as, namely heating furnace, heat its cold water, rather than extract simply its hot water.
1, solved the problem that can dig a well anywhere, the high place of ground temperature only, what well was beaten can be more shallow, the place that ground temperature is low, it is darker that well will be beaten.
3, enter the stratum How much water, take out How much water, a fat lot of getting kept the balance of level of ground water.
4, save a large amount of coal resources, can save 2.5 hundred million tons of coals every year, conservative by 500 yuan of calculating per ton, be 1,250 hundred million yuan; Greatly reduce simultaneously the discharging of CO2, reduced many environmental pollutions.Because the CO2 that mark coal combustion per ton produces amount, the general 2.6 tons of CO2 of Industrial Boiler save 2.5 hundred million tons of coals so, just can reduce by 6.5 hundred million tons of CO2 dischargings.
5, can implement in the place that sedimentary basin arranged, and the area that there is a sedimentary basin in China 6,000,000 sq-kms nearly, avoid the limitation of present exploitation underground heat.
6, save groundwater resources, prevent that excessive exploitation from causing the decline of water level.Surface subsidence has in various degree occured in city, more than 50,19 provinces of China, and mainly concentrates on the Yangtze River Delta Area.
7, contain more mineral matter from underground hot water out.These mineral matters and trace element have certain beauty and skin care effect, can improve skin, stimulate circulation, and the mineral matters such as the calcium in these water, magnesium, sodium, bicarbonate, hydrogen sulfide can change the skin acid value, thus the softening skin cutin.Therefore, commonly used its had a bath and can be beneficial to health of people.
8, can how to use in work, agricultural, resident, greenhouse etc.Industrial and agricultural production and medicine and hygiene fields have been widely used in.Industrially be mainly used in generating, weaving, printing and dyeing, papermaking, brewage, leather processing processing etc.; Be mainly used on agricultural that insulation is grown seedlings, greenhouse production, artificial incubation and the irrigation water temperature etc. of adjusting.
On the basis of technique scheme, the present invention can also do following improvement.
Further, in step 2) in, described reservoir is sand layers in Continental Facies Stratigraphy, is Karst cave and/or crack at marine bed.
Further, in step 2) in, the concrete steps of described definite reservoir are:
2.1) to be chosen on earth history be the place of sedimentary basin;
Due to exploration, the exploitation of energy resource geology (oil, natural gas, coal and unconventional natural gas), the distribution of sedimentary basin is substantially clear.If, it be unclear that, can adopt the non-seismic geophysical and geochemical exploration technology to resemble the technical methods such as gravity, magnetic force, electrical method, geochemical exploration, identify and draw a circle to approve.
2.2) in sedimentary basin, dope the position of reservoir with seismic method;
Reflective wave method is mainly used in earthquake, identifies the reservoir, because the reservoir is usually moisture, amplitude, frequency, wavelength that can cause it etc. changes.In addition, the speed that seismic wave is propagated in different rocks is different, so just can distinguish mud extraction, shale and sand, conglomerate in Continental Facies Stratigraphy; Distinguish limestone and dolomite in marine bed.
2.3) according to the reservoir that seismic method is predicted out, thickness, scope, space and the permeability of described reservoir are identified, select satisfactory reservoir;
Generally, selecting the thickness of reservoir is 20～50 meters; Distributional stability, general area is greater than 100 sq-kms; Permeability will be got well, and general porosity is greater than 25%, and permeability is greater than 200 millidarcies; Connectedness will be got well; The roof and floor closure will be got well.Putting before this, geothermal gradient is more high better; Because geothermal gradient is high, obtaining under same water temperature condition, it is shallow that well is just beaten, and just saves cost.
Further, in step 3), the concrete steps of described drilling well are: use the 311mm drill bit, bore the game clock layer, and then use the 215mm drill bit, then down creep into, get into the place, reservoir, then be lowered to sleeve pipe, then cement the well with cement mortar.
Further, the skin depth opened of described brill is 300～500 meters.
Further, also comprise the steps: to be lowered to surface pipe for preventing that the top layer from collapsing between the step of boring the game clock layer and then down creeping into, then cement the well with cement mortar.
Further, the thickness of described surface pipe is 240mm.
Further, the thickness of described sleeve pipe is 140mm.
Further, after drilling well is located to the reservoir, further comprising the steps of before setting of casing: as to carry out geophysical log.Thickness, the permeability of measuring the reservoir on the one hand; Be the measuring well temperature on the other hand, determine geothermal gradient.
Purpose be see with dig a well before the result that records be that (when referring to determine a good reservoir process, the measurement result that obtains) is no identical, be high or low.This determines to distinguish at this from now on the degree of depth of well-digging, and the cost of well-digging.
Further, in step 4), described process conditions of carrying out perforation are: select 102 type rifles to fill 127 and play jet perforating, and spiral cloth hole, 60 ° of phase angles, the close 24 hole/rice in hole, emissivity is not less than 98%.
Before perforation, sleeve pipe, cement sheath (cement mortar cement the well one deck become cement sheath) are wrapped stratum and coal seam, and after only having perforation, perforating bullet is successively worn pore-forming to sleeve pipe, cement sheath, be mapped to the reservoir, the reservoir can be communicated with inlet well and wet well.
Further, the degree of depth of described inlet well and wet well is 2000～3000 meters.
Further, described inlet well is 300～500 meters to the distance of wet well.
Further, the width of described reservoir passage is 20～50 meters.
Further, the temperature of the hot water after described heating is 95～135 ℃.
Further, in described wet well, suction pump is installed, hot water can be extracted into the water outlet well head.
Further, earth's surface fresh water is during through the reservoir passage, the step that also comprises pressure break, described pressure break is to pressurize from the earth's surface, by the hole of penetrating out, fracturing fluid, proppant are pressed into the reservoir, break and namely produce major fracture in the reservoir, fracturing fluid carries proppant and enters the stratum, can reach 200～300 meters scopes along the major fracture direction; Wherein, described of the fracturing fluid consumption is 1200～1500 sides, and the consumption of proppant is 60～80 sides.
Further, the described fracturing unit that carries out pressure break is the above well behaved Frac units of 1000 types.
Further, described fracturing fluid is active water or clear water, and described proppant is quartz sand.
Further, also adding percent by volume in described clear water is 1～3% KCL, and adding the KCL purpose is to improve fracturing fluid viscosity, and quartz sand is easy to carry.
Further, described pressure from the earth's surface pressurization is 30～40 MPas.
Further, the described discharge capacity that fracturing fluid, proppant are pressed into the reservoir is 3～5 sides per minute.
By the hot water that said method obtains, first verify the physicochemical properties of water.The well-digging water outlet wants water sampling to carry out assay every day.If be used for heating, see the composition whether corroded pipeline is arranged, such as sulfur-bearing is high; If be used for having a bath, see the element of unmatchful harm.After verifying, then by pipeline or water-tank lorry, transport the destination to.
Description of drawings
Fig. 1 be the present invention circulate the exploitation geothermal energy resources method in the structural representation of making a call to two mouthfuls of straight wells;
In accompanying drawing, the list of parts of each label representative is as follows:
1, inlet well, 2, wet well, 3, the reservoir, 4, suction pump.
The specific embodiment
Below in conjunction with accompanying drawing, principle of the present invention and feature are described, example only is used for explaining the present invention, is not be used to limiting scope of the present invention.
At first determined to find good reservoir
Found good reservoir, concrete steps are: determine a well location on satisfactory reservoir, generally with reference to the basin periphery outcrop data, in conjunction with the non-seismic geophysical and geochemical exploration data, earthquake and this district data of in the past digging a well particularly, and through after comprehensive geology condition analysis determining well location, drill, general coalfield or the oil-well rig of adopting drilled.Purpose is that the reservoir that confirmation is determined take earthquake as main method exists, if exist, then determines the quality of reservoir.
After getting out a well, water outlet in described well, and every day water yield more than 100 sides, continuous effluent namely is defined as a good reservoir more than 3 months.
Then make a call to two mouthfuls of straight wells, as shown in Figure 1, namely a bite well position relatively low in the reservoir, be used for water inlet; Another mouthful well is used for water outlet at relatively high position.Through drilling well, confirmed the reliability of seismic data.So, can dispose two mouthfuls of wells at the main bearing of trend of reservoir.Wherein, flatly at low position, be inlet well 1; Another mouthful is wet well 2 in high-order bit slightly.Because, base area downforce system and potential energy distribution, normally water is toward the high-order bit migration.
The two mouthfuls of wells of making a call to need to carry out perforation 3 sections of same reservoirs, penetrate out 20～50 meters thick reservoir passages, and earth's surface fresh water through the ground pressurization, enters stratum with water from inlet well 1 perforation.Enter the stratum, through the reservoirs of 300～500 meters 3 passages (being the distance of 2 of inlet well 1 and wet well), at 95～135 ℃ of temperature, self just can be heated very soon.Until wet well 2 perforation places, temperature can reach 95～135 ℃ basically, and the suction pump 4 through wet well is installed is extracted into well head with water.Then, by pipeline or water-tank lorry, transport the destination to.
If current are not smooth, need to carry out pressure break.Adopt clear water as fracturing fluid, quartz sand is as proppant, certain discharge capacity, certain sand ratio.
Fracturing unit is selected the above well behaved Frac unit of 1000 types, and fracturing fluid is selected active water or clear water (add mass percent be 1～3% KCL).Common fracturing fluid consumption 1200～1500 sides, quartz sand 60～80 sides, discharge capacity 3～5 sides per minute, pressure is added to 30～40 MPas.
If found the reservoir, but the reservoir is not in good situation, and also an available horizontal well replaces the reservoir.Namely make a call to two mouthfuls of wells, a bite straight well, water horizontal well, two mouthfuls of well docking.Concrete steps are:
First at the straight well of brill a bite vertical depth 2500m left and right, higher part position, the straight well well head is apart from horizontal well well head 900m.Then bore the water horizontal well at lower position, horizontal well is widened the view by the 311mm drill bit, approximately is lowered to the 240mm sleeve pipe in the position of 250m to well depth, and cement mortar returns to ground.Two spud in cement plugs and enter new stratum and begin deflecting to well depth 1800m, the assembly power drilling tool, 4.5 °/30m of design inclination section dog-leg degree, Section Design is single circular arc section, creeps into to 60 ° of 3800m(hole angles, horizontal displacement 500m, vertical depth 2800m).Lower 140mm sleeve pipe, lower to the top, reservoir.During use, at the tap water heating of horizontal well place to injecting, the running water after heating takes out from straight well.
The above is only preferred embodiment of the present invention, and is in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, is equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (24)
1. the method for exploitation geothermal energy resources that circulates, is characterized in that, comprises the following steps:
1) determine an area that geothermal gradient is relatively high;
2) determine the reservoir in described geothermal gradient relatively high area;
3) determine the well location of two mouthfuls of wells and carry out drilling well at the main bearing of trend of described reservoir, the position that a bite well is relatively low in the reservoir is inlet well; The position that another mouthful well is relatively high in the reservoir is wet well;
4) described inlet well and wet well are all got into the place, reservoir, and then carry out perforation at same reservoirs, obtain the reservoir passage, make described inlet well communicate with described wet well by the reservoir passage;
5) on ground, inject earth's surface fresh water from described inlet well, earth's surface fresh water is through the reservoir passage, the hot water after being heated, the hot water after described heating flows into wet well, and then delivers to the water outlet well head and get final product.
2. the method for circulation exploitation geothermal energy resources according to claim 1, is characterized in that: in step 2) in, described reservoir is sand layers in Continental Facies Stratigraphy, is Karst cave and/or crack at marine bed.
3. the method for circulation exploitation geothermal energy resources according to claim 1, is characterized in that: in step 2) in, the concrete steps of described definite reservoir are:
2.1) to be chosen on earth history be the place of sedimentary basin;
2.2) in sedimentary basin, dope the position of reservoir with seismic method;
2.3) according to the reservoir that seismic method is predicted out, thickness, scope, space and the permeability of described reservoir are identified, determine satisfactory reservoir.
4. the method for geothermal energy resources is exploited in circulation according to claim 3, and it is characterized in that: described seismic method is reflective wave method.
5. the method for geothermal energy resources is exploited in circulation according to claim 3, it is characterized in that: the Reservoir Thickness of described satisfactory reservoir is 20～50 meters, the reservoir scope is greater than 100 square metres, and the porosity of reservoir is greater than 25%, and the permeability of reservoir is greater than 200 millidarcies.
6. the method for geothermal energy resources is exploited in circulation according to claim 1, it is characterized in that: in step 3), the concrete steps of described drilling well are: use the 311mm drill bit, bore the game clock layer, and then use the 215mm drill bit, and then down creep into, get into the place, reservoir, be lowered to again sleeve pipe, then cement the well with cement mortar.
7. the method for geothermal energy resources is exploited in circulation according to claim 6, and it is characterized in that: the skin depth that described brill is opened is 300～500 meters.
8. the method for circulation according to claim 6 exploitation geothermal energy resources is characterized in that: also comprise the steps: to be lowered to surface pipe for preventing that the top layer from collapsing between the step of boring the game clock layer and then down creeping into, then cement the well with cement mortar.
9. the method for geothermal energy resources is exploited in circulation according to claim 8, and it is characterized in that: the thickness of described surface pipe is 240mm.
10. the method for geothermal energy resources is exploited in circulation according to claim 6, and it is characterized in that: the thickness of described sleeve pipe is 140mm.
11. the method for circulation exploitation geothermal energy resources according to claim 6 is characterized in that: after drilling well is located to the reservoir, further comprising the steps of before setting of casing: as to carry out geophysical log.
12. the method for circulation according to claim 11 exploitation geothermal energy resources is characterized in that: describedly carrying out geophysical log, is thickness, the permeability of measuring the reservoir on the one hand; Be the measuring well temperature on the other hand, determine geothermal gradient.
13. the method for the described circulation exploitation of according to claim 1 to 12 any one geothermal energy resources, it is characterized in that: in step 4), described process conditions of carrying out perforation are: select 102 type rifles to fill 127 and play jet perforating, spiral cloth hole, 60 ° of phase angles, the close 24 hole/rice in hole, emissivity is not less than 98%.
14. the method for the described circulation exploitation of according to claim 1 to 12 any one geothermal energy resources, it is characterized in that: the degree of depth of described inlet well and wet well is 2000～3000 meters.
15. the method for the described circulation exploitation of according to claim 1 to 12 any one geothermal energy resources, it is characterized in that: described inlet well is 300～500 meters to the distance of wet well.
16. the method for the described circulation exploitation of according to claim 1 to 12 any one geothermal energy resources, it is characterized in that: the thickness of described reservoir passage is 20～50 meters.
17. the method for the described circulation exploitation of according to claim 1 to 12 any one geothermal energy resources, it is characterized in that: the temperature of the hot water after described heating is 95～135 ℃.
18. the method for the described circulation exploitation of according to claim 1 to 12 any one geothermal energy resources is characterized in that: in described wet well, suction pump is installed, hot water can be extracted into the water outlet well head.
19. the method for the described circulation exploitation of according to claim 1 to 12 any one geothermal energy resources, it is characterized in that: earth's surface fresh water is during through the reservoir passage, the step that also comprises pressure break, described pressure break is to pressurize from the earth's surface, by the hole of penetrating out, fracturing fluid, proppant are pressed into the reservoir, break and namely produce major fracture in the reservoir, fracturing fluid carries proppant and enters the stratum, can reach 200～300 meters scopes along the major fracture direction;
Wherein, described of the fracturing fluid consumption is 1200～1500 sides, and the consumption of proppant is 60～80 sides.
20. the method for circulation exploitation geothermal energy resources according to claim 19 is characterized in that: the described fracturing unit that carries out pressure break is the above well behaved Frac units of 1000 types.
21. the method for circulation exploitation geothermal energy resources according to claim 19, it is characterized in that: described fracturing fluid is active water or clear water, and described proppant is quartz sand.
22. the method for circulation according to claim 21 exploitation geothermal energy resources is characterized in that: also adding percent by volume in described clear water is 1～3% KCL.
23. the method for circulation exploitation geothermal energy resources according to claim 19 is characterized in that: described pressure from the earth's surface pressurization is 30～40 MPas.
24. the method for circulation according to claim 19 exploitation geothermal energy resources is characterized in that: the described discharge capacity that fracturing fluid, proppant are pressed into the reservoir is 3～5 sides per minute.
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| CN109869143A (en) * | 2019-01-18 | 2019-06-11 | 潜能恒信能源技术股份有限公司 | The dispositions method and high-efficient circulating system of high yield geothermal well |
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