CN212428774U - Geothermal well three-ring pressure crack and circulating heat conduction system - Google Patents
Geothermal well three-ring pressure crack and circulating heat conduction system Download PDFInfo
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- CN212428774U CN212428774U CN202021004122.5U CN202021004122U CN212428774U CN 212428774 U CN212428774 U CN 212428774U CN 202021004122 U CN202021004122 U CN 202021004122U CN 212428774 U CN212428774 U CN 212428774U
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Abstract
The utility model discloses a geothermal well three ring crush cracks and geothermal well three ring crush crack circulation heat conduction system, include: the outer ring conducts heat and does not leak microcracks; the middle ring heat conduction high-permeability main crack is positioned in the outer ring heat conduction non-permeability micro crack, and the middle ring heat conduction high-permeability main crack is respectively provided with an upper port and a lower port. The utility model discloses use propping agents such as nanometer micron order graphite alkene, graphite, active carbon of high heat conduction and from the foam fracturing fluid that produces to carry out the fracturing to geothermal well, build radial outer loop heat conduction and do not ooze three-dimensional from airtight, the geothermal well three-ring pressure crack and the circulation heat conduction system that the microcrack, zhonghuan heat conduction hypertonic main crack, the inner ring heat insulation do not ooze the packing seam etc. and constitute. The geothermal energy is exploited by single-well and single-phase liquid circulation heat conduction and exchange, so that the large-area and micro-seam net, high heat conduction and high heat exchange of dry heat type and hydrothermal type geothermal energy are realized, only heat is taken, water is not taken, the cost is low, and the application is wide.
Description
Technical Field
The utility model relates to a geothermal well three ring pressure cracks and circulation heat conduction system.
Background
Geothermal energy is inexhaustible natural heat energy with huge potential which is stored in the earth. Particularly, geothermal energy of hydrothermal type, dry hot rock and the like is a clean new energy with wide distribution, shallow burial, large resource amount and reproducibility. Under the conditions that the environmental awareness is gradually enhanced and the energy is gradually scarce, the reasonable development and utilization of geothermal energy are more and more emphasized, and the solar energy generation system plays an increasingly important role in the future.
However, the existing 'water collection and heat extraction' method for hydrothermal geothermal energy directly extracts a large amount of hot water resources from the geothermal layer to the ground for heat exchange, heat extraction and heat supply, and because a large amount of original underground hot water containing salt and harmful minerals is extracted, the heat supply amount and temperature are unstable, the equipment corrosion is fast, the environmental pollution is large, the sewage treatment cost is high, and even geological disasters such as ground collapse, landslide, earthquake and the like are caused by rapid reduction of super-extraction pressure, unbalance of ground stress and serious reduction of underground water level; in the existing 'enhanced geothermal system' (EGS) technology of dry heat type geothermal energy, a fracture network formed by fracturing a plurality of wells is required to be communicated with an injection well and a production well, heat exchange water is injected to absorb heat and exchange heat in a high-temperature geothermal layer fracture to form steam, and a ground power generation method is produced from the production well; the geothermal layer and water have low heat conductivity coefficient, poor heat conductivity, slow heat transfer, low heat exchange quantity and efficiency and unstable heat supply; the main medium water for heat conduction and exchange of the high-temperature geothermal layer is changed from liquid state to gas state into liquid state for multiple times of transformation, the temperature and flow rate change is large, related equipment is more, the heat efficiency is low, and the cost is high. These problems severely restrict the efficient and environment-friendly development and utilization of geothermal energy such as hydrothermal type and dry hot rock.
The above background is for the convenience of understanding the present invention and is not a known art that has been previously disclosed to the general public.
Interpretation of terms
Geothermal energy: the geothermal energy is natural heat energy stored in the earth, and particularly is the geothermal energy which is wide in distribution, shallow in storage, large in resource quantity, renewable and exploitable in a hydrothermal type, a dry heat type and the like.
Graphene: graphene (Graphene) is a two-dimensional nano carbon material with hexagonal honeycomb lattice, high thermal conductivity, high compression resistance and high heat resistance.
Heat-conducting liquid: the special heat-conducting liquid is used for the three-cycle fracturing of the geothermal well and a circulating heat-conducting system.
SUMMERY OF THE UTILITY MODEL
Based on the above problem, on the one hand, the utility model provides a geothermal well three ring crush crack, this geothermal well three ring crush crack has high heat conduction, high infiltration, high strength, big seam face, the water is few, the environmental protection is good, unique advantage such as with low costs, but wide application in the exploitation of dry heat type and hydrothermal type geothermal energy, with single-ported well, single-phase liquid is in heat conduction high infiltration main crack inner loop heat conduction heat transfer exploitation geothermal energy, realize hydrothermal type and dry heat type geothermal energy "large tracts of land, the micro-seam net, high heat conduction, high heat transfer, only get heat, do not adopt water, and is with low costs, be suitable for wide" clean high-efficient development and utilization.
The technical scheme is as follows: a geothermal well three ring crush fracture, the geothermal well three ring crush fracture comprising:
the outer ring conducts heat and does not leak microcracks;
the middle ring heat conduction high permeability main crack is positioned in the outer ring heat conduction non-permeability micro crack and is respectively provided with a middle ring heat conduction high permeability main crack upper port and a middle ring heat conduction high permeability main crack lower port; and
the inner ring heat-insulating non-seepage filling seam is positioned in the middle ring heat-conducting high-seepage main crack.
The utility model discloses in, be located the outer loop around the geothermal well sleeve pipe in geothermal layer for large tracts of land heat conduction is but not impermeably, separates the fluid entering zhonghuan heat conduction hypertonic main crack of peripheral geothermal layer. And the middle ring positioned around the heat well casing in the geothermal layer is used for heat conduction and heat exchange of geothermal energy due to the flowing of the heat conduction liquid. And the inner ring is positioned around the sleeve of the geothermal well in the geothermal layer and is used for isolating the heat energy and the fluid of the heat-conducting high-permeability main crack of the geothermal well and the inner ring.
Preferably, the heat-conducting impermeable microcracks are radially outward. The radial outer ring increases the heat exchange area, and is more favorable for improving the heat exchange efficiency.
On the other hand, the utility model also provides a geothermal well three ring crush crack circulation heat conduction system.
The technical scheme is as follows: a geothermal well three ring crush fracture circulation heat transfer system, the geothermal well three ring crush fracture circulation heat transfer system includes:
the geothermal well three-ring fracturing fracture is the geothermal well three-ring fracturing fracture;
the geothermal well casing is respectively communicated with the lower port of the middle ring heat-conducting high-permeability main crack and the upper port of the middle ring heat-conducting high-permeability main crack;
a packer positioned within a geothermal well casing, the packer comprising a lower packer and an upper packer;
the heat insulation oil pipe is positioned in the geothermal well casing;
a low-temperature heat-conducting liquid tank;
a high-temperature heat-conducting liquid tank;
the ground circulating pump is respectively connected with the low-temperature heat-conducting liquid tank and the heat-insulating oil pipe; and
and the ground heat exchange station is respectively connected with the low-temperature heat conduction liquid tank and the high-temperature heat conduction liquid tank.
The utility model discloses a principle and beneficial effect lie in:
1. micro-slit net, large area. The proppant such as nano-scale graphene, micron-scale graphite, activated carbon and the like and the self-generated foam fracturing fluid are beneficial to forming a closed fracture circulating system consisting of large-area heat-conducting non-permeable microcracks, heat-conducting high-permeability main fractures, heat-insulating non-permeable filling fractures and the like by the fracturing of the geothermal layer. The self-generated foam fracturing fluid enters pores and natural cracks of the geothermal layer, is quickly heated, gasified and expanded, and has increased viscosity, thereby being beneficial to reducing leakage and improving the internal pressure of the cracks; the high-temperature dry and hot rock is easy to be subjected to cold embrittlement cracking when suddenly meeting low-temperature foam fracturing fluid and gasification heat absorption, and a large-area radial micro-crack network is formed. When the volume of the propping agent is the same, the nano-scale graphene, the micron-scale graphite and the activated carbon propping agent are used for facilitating the carrying, the uniform distribution and the support of the micro-nano-scale micro-crack network by the self-generated foam fracturing fluid, and compared with the fracturing propping seam using the conventional millimeter-scale propping agent, the fracture width of the fracturing propping seam is decimal ten times to hundreds times, and the surface area of the corresponding fracturing propping seam is dozens of times to hundreds times.
2. High heat conductivity and high heat exchange. The graphene, graphite and activated carbon in large-area heat conduction seepage-proofing microcracks and heat conduction high-permeability main cracks of the geothermal well three-ring pressure crack and crack circulation heat conduction system have excellent characteristics of high heat conduction and high heat transfer, particularly the heat conduction coefficient of the graphene can reach 5300W/mK to the maximum and is about ten thousand times higher than that of water, and the heat conduction distance, the heat conduction speed, the heat exchange area and the heat conduction and exchange efficiency between a geothermal layer and heat conduction liquid can be greatly improved.
3. Only heat was taken, no water was taken. The large-area heat conduction seepage-proofing microcracks of the heat conduction circulating heat conduction system completely isolate hot water, hot gas and harmful substances of the geothermal layer, particularly the original stratum of a hydrothermal geothermal layer, and no wastewater, waste gas or waste residue is produced; the high-efficiency adsorption, filtration and purification effects of a large amount of activated carbon in the heat-conducting high-permeability main cracks enable heat-conducting liquid circulating out of the underground cracks to be cleaner, and 'only heat and no water' are obtained.
4. Single well, single phase liquid. A three-ring fracturing crack and circulating heat conduction system of a geothermal well can form a closed fracturing crack circulating system consisting of large-area heat conduction seepage-proofing micro cracks, heat conduction high-permeability main cracks, heat insulation low-permeability filling cracks and the like on a geothermal layer of a single well. The single well is an injection well and an extraction well, can realize continuous and stable circulation of the single well and single-phase liquid (heat conducting liquid), carries out underground heat conduction and heat exchange exploitation and utilizes geothermal energy, and can greatly reduce the construction investment and the operation cost of the geothermal well and a ground system.
5. Low cost and wide application. The three-ring fracturing fracture and circulating heat conduction system of the geothermal well can be widely applied to geothermal wells such as vertical wells, directional wells, horizontal wells, branch wells and the like of geothermal layers such as hydrothermal type, dry-heat rock type and the like, and can realize large-area and micro-cracking networks by using single-hole wells and single-phase liquid with low investment and low cost; high heat conduction and high heat exchange; only heat is taken, and water is not taken; low cost, wide application, high efficiency and environmental protection.
Drawings
FIG. 1 is a schematic longitudinal cross-sectional view of a three-ring fracture of a geothermal well according to the present invention;
FIG. 2 is a schematic diagram of a transverse cross section of a three-ring fracture of the geothermal well;
FIG. 3 is a schematic view of a geothermal well three-ring fracture circulation heat conduction system;
the reference numbers in the figures are: the geothermal heat-conducting layer comprises a geothermal layer 1, an outer ring heat-conducting non-seepage microcrack 2, a middle ring heat-conducting high-seepage main crack 3, an inner ring heat-insulating non-seepage filling crack 4, a geothermal well casing 5, a lower packer 6, an upper packer 7, a heat-insulating oil pipe 8, a high-temperature heat-conducting liquid tank 9, high-temperature heat-conducting liquid 10, a ground heat exchange station 11, a low-temperature heat-conducting liquid tank 12, low-temperature heat-conducting liquid 13 and a ground circulating pump 14.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "longitudinal", "lateral", "horizontal", "inner", "outer", "front", "rear", "top", "bottom", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and the terms are only for convenience of description of the present invention and simplifying the description, but do not indicate or imply that the device or element to which the term refers must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
In the description of the present invention, it should be further noted that, unless otherwise explicitly specified or limited, the terms "disposed," "opened," "mounted," "connected," and "connected" are to be construed broadly, e.g., as either a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1-2, the present invention provides a three-ring fracturing fracture for a geothermal well.
The utility model provides a three ring fracturing cracks of geothermal well, is including the interior ring heat-insulating not infiltration filling crack 4, zhonghuan heat conduction hypertonic main crack 3 and the outer loop heat conduction not infiltration microfracture 2 that set up in order, and zhonghuan heat conduction hypertonic main crack 3 is located outer loop heat conduction not infiltration microfracture 2, and interior ring heat-insulating not infiltration filling crack 4 is located zhonghuan heat conduction hypertonic main crack 3, and zhonghuan heat conduction hypertonic main crack 3 is provided with zhonghuan heat conduction hypertonic main crack upper port and zhonghuan heat conduction hypertonic main crack lower port respectively. The utility model discloses in, geothermal well three ring pressure cracks form three ring three-dimensional pressure crack circulation structure.
The outer ring heat conduction non-permeable microcracks 2 are positioned around a heat well casing 5 in the geothermal layer 1 and are used for large-area heat conduction but non-permeability to separate the fluid of the peripheral geothermal layer 1 from entering the middle ring heat conduction high-permeability main cracks 3.
The middle-ring heat-conducting high-permeability main crack 3 is positioned around a geothermal well casing 5 in the geothermal layer 1 and is used for heat conduction and heat exchange geothermal energy through flowing of heat-conducting liquid.
The inner ring heat insulation impervious filling seam 4 is positioned around a geothermal well casing 5 in the geothermal layer and is used for isolating heat energy and fluid of the geothermal well and the middle ring heat conduction high-permeability main seam 3.
It is further explained that, in the utility model, the heat conduction prevention of seepage microcrack is radial to the outer layer, and radial outer loop has increased heat transfer area, more is favorable to improving heat exchange efficiency.
Based on foretell geothermal well three ring crush cracks, the utility model also provides a geothermal well three ring crush crack circulation heat conduction system.
Referring to fig. 3, a geothermal well three-ring fracturing crack circulating heat conducting system comprises the geothermal well three-ring fracturing crack, a geothermal well casing 5, a packer, a heat insulating oil pipe 8, a low-temperature heat conducting liquid tank 12, a high-temperature heat conducting liquid tank 9, a ground heat exchange station 11 and a ground circulating pump 14, wherein the heat insulating oil pipe 8 and the packer are positioned in the geothermal well casing 5, the packer comprises a lower packer 6 and an upper packer 7, the geothermal well three-ring fracturing crack is positioned in a geothermal layer 1, and the geothermal well casing 5 respectively penetrates through an outer ring heat conducting non-seepage microcrack 2, a middle ring heat conducting high-seepage main crack 3 and an inner ring heat insulating non-seepage filling crack 4. The utility model discloses in, geothermal well sleeve 5 is located the geothermal well eye at geothermal layer 1 center, and geothermal well three ring pressure cracks are by the cladding of geothermal layer 1. The heat-conducting geothermal energy is used for circularly entering the low-temperature heat-conducting liquid and is heated and converted into the high-temperature heat-conducting liquid.
The upper packer 7 is positioned below the upper port of the middle ring heat-conducting high-permeability main crack and is used for isolating the communication between the geothermal well casing 5 and the heat insulation oil pipe 8.
The lower packer 6 is positioned above the lower port of the middle ring heat-conducting high-permeability main crack and is used for sealing and isolating the communication between the geothermal well casing 5 and the heat-insulating oil pipe 8.
And the heat insulation oil pipe 8 is concentrically arranged in the geothermal well casing 5 and is connected with the lower packer 6 and the upper packer 7, and the heat insulation oil pipe 8 is mainly used as a flow channel of heat conduction liquid.
The low-temperature heat conduction liquid tank 12 is located on the ground and is respectively connected with an outlet of the ground heat exchange station 11 and an inlet of a ground circulating pump 14, the low-temperature heat conduction liquid 13 is stored in the low-temperature heat conduction liquid tank 12, and the low-temperature heat conduction liquid 13 is used for being circularly injected into the middle-ring heat conduction high-permeability main crack 3 to conduct heat and convert the heat into the high-temperature heat conduction liquid 10.
The high-temperature heat conduction liquid tank 9 is located on the ground, the high-temperature heat conduction liquid tank 9 is connected with an inlet of the ground heat exchange station 11 and a wellhead end of a geothermal well pipe and used for storing high-temperature heat conduction liquid 10 produced by the geothermal well, and the high-temperature heat conduction liquid 10 is used for being converted into low-temperature heat conduction liquid 13 after the ground heat exchange station 11 provides heat energy.
The ground heat exchange station 11 is located on the ground, an inlet of the ground heat exchange station 11 is connected with the high-temperature heat conduction liquid tank 9, an outlet of the ground heat exchange station 11 is connected with the low-temperature heat conduction liquid tank 12, and the ground heat exchange station 11 is used for converting and utilizing geothermal energy to transmit heat energy and electric energy and changing the high-temperature heat conduction liquid 10 into the low-temperature heat conduction liquid 13.
The ground circulating pump 14 is located on the ground, an inlet of the ground circulating pump 14 is connected with the low-temperature heat-conducting liquid tank 12, an outlet of the ground circulating pump 14 is connected with an upper port of the heat-insulating oil pipe 8, and the ground circulating pump 14 is used for pumping circulating low-temperature heat-conducting liquid 13.
The geothermal well three-ring fracture circulating heat conduction system is prepared by the following method:
step 1: and fracturing to form an outer ring heat-conducting impermeable microcrack. And opening or shooting a communication hole of the thermal well casing 5 in the middle of the geothermal layer 1, injecting a combined propping agent such as graphene and graphite and a self-generated foam fracturing fluid into the geothermal layer for fracturing and crack formation, and forming a high-heat-conductivity large-surface impermeable outer-ring heat-conduction impermeable microcrack 2 on the outer ring of the geothermal layer.
The formation process and principle of the outer ring heat conduction seepage microcrack are as follows: the self-generated foam fracturing fluid is continuously gasified in the geothermal layer to form self-generated foam, and the crack is pushed to radially expand into a microcrack network with an ultra-large surface area. Meanwhile, after the carried nanoscale heat-conducting graphene and micron-sized heat-conducting graphite enter pores and microcracks of the geothermal layer and continuously permeate, filter loss, dehydrate and block pore throat permeation channels, a large amount of the carried nanoscale heat-conducting graphene and micron-sized heat-conducting graphite are continuously gathered, filled and compacted in a microcrack network, and finally, high-heat-conductivity, large-surface and impermeable outer-ring heat-conducting impermeable microcracks are formed in the geothermal layer.
The utility model discloses do not do special restriction to the specific quantity and the proportion of combination proppant such as graphite alkene, graphite and autogenous foam fracturing fluid, can carry out analogue test optimization selection to the quantity and the proportion of each material according to self conditions such as concrete lithology, buried depth, thickness, porosity, pressure, temperature of actual geothermal layer, can also add some other supplementary synergists.
Step 2: and fracturing to form middle-ring heat-conducting high-permeability main cracks. Combining a propping agent and a self-generated foam fracturing fluid by using graphite, activated carbon, ceramsite and the like, continuously injecting the mixture into the geothermal layer for fracturing and crack expanding, and forming a middle-ring heat-conducting high-permeability main crack 3 with high heat conductivity and high permeability in the middle ring of the geothermal layer 1.
The forming process and principle of the middle ring heat conduction high-permeability main crack are as follows: and preferably, micron-sized heat conduction graphite, activated carbon, millimeter-sized ceramsite and other combined propping agents and the self-generated foam fracturing fluid are selected, and the geothermal layer is fractured by a fracturing pump. The fracturing fluid is continuously gasified, expanded, foamed, tackified, pressurized and expanded in width and length of the seam, and the carried combined propping agents such as graphite, activated carbon, ceramsite and the like enter and support the expanded wide-end long seam, and finally a high-heat-conduction and high-permeability middle-ring heat-conduction high-permeability main crack is formed in the middle ring of the geothermal layer.
The utility model discloses do not do special restriction to the concrete quantity and the proportion of combination proppant such as graphite, active carbon and haydite and autogenous foam fracturing fluid, can carry out analogue test optimization selection to the content proportion and the quantity of each material according to self conditions such as concrete lithology, buried depth, thickness, porosity, pressure, temperature of actual ground heating layer, can also add some other supplementary synergists.
And 3, step 3: and fracturing to form an inner ring heat-insulating impermeable filling seam. And (3) continuously injecting a combined filling agent such as cement, resin and the like and the self-generated foam fracturing fluid into the geothermal layer for fracturing and filling, and solidifying the inner ring of the geothermal layer 1 to form an insulating and impermeable inner ring insulating and impermeable filling seam 4.
The forming process and principle of the inner ring heat insulation non-seepage filling seam are as follows: the filling agent such as micron-sized cement, resin and the like and the self-generated foam fracturing fluid are preferably injected into the geothermal layer by a fracturing pump for fracturing and filling, and the inner ring of the geothermal layer is gasified, filled and solidified to form an inner ring heat-insulating non-seepage filling seam with high heat insulation and low permeability.
The utility model discloses do not do special restriction to the specific quantity and the proportion of filler such as cement, resin and autogenous foam fracturing fluid, can carry out analogue test optimization selection to the quantity and the proportion of each material according to self conditions such as concrete lithology, buried depth, thickness, porosity, pressure, temperature of actual ground heating layer, can also add some other supplementary synergists.
And 4, step 4: and (4) installing and connecting ground circulating heat exchange equipment. The positive circulation installation sequence is that the well mouth ends of the geothermal well casing 5, the high-temperature heat-conducting liquid tank 9, the ground heat exchange station 11, the low-temperature heat-conducting liquid tank 12, the ground circulating pump 14 and the heat-insulating oil pipe 8 are installed and connected; or the reverse circulation installation sequence is adopted, and the wellhead end of the heat insulation oil pipe 8, the high-temperature heat conduction liquid tank 9, the ground heat exchange station 11, the low-temperature heat conduction liquid tank 12, the ground circulating pump 14 and the wellhead end of the geothermal well casing 5 are installed and connected.
And 5, step 5: and opening and cleaning the middle ring heat-conducting high-permeability main crack. Opening or shooting the perforations at the upper part and the lower part of the geothermal layer 1 and the casing 5 of the geothermal well, concentrically setting a lower packer 6, an upper packer 7 and a heat insulation oil pipe 8 in the casing of the geothermal well, cleaning the main crack 3 communicated with the middle-ring heat conduction high permeability by using the positive and negative circulation of acid liquor, and circularly replacing all the cleaning acid liquor by using low-temperature heat conduction liquid 13.
And 6, step 6: and starting ground equipment for circulating heat conduction and heat exchange. The ground circulating pump 14 is started in a positive circulation mode, the low-temperature heat-conducting liquid 13 in the low-temperature heat-conducting liquid tank 12 is pumped into the heat-insulating oil pipe 8 to descend to the bottom of the well, and enters the middle-ring heat-conducting high-permeability main crack 3 from the lower hole of the geothermal well casing 5; the low-temperature heat-conducting liquid 13 flows in the middle-ring heat-conducting high-permeability main crack 3 and is heated by the geothermal layer 1 to be heated to become the high-temperature heat-conducting liquid 10; the high-temperature heat-conducting liquid 10 rises to the wellhead end of the geothermal well casing 5 from the upper part of the middle-ring heat-conducting high-permeability main crack 3 through the upper hole of the geothermal well casing 5, enters the high-temperature heat-conducting liquid tank 9, is changed into low-temperature heat-conducting liquid 13 through heat exchange of the ground heat exchange station 11, returns to the low-temperature heat-conducting liquid tank 12, and completes a cycle of heat-conducting heat exchange flow. According to the heat energy output demand of the ground heat exchange station, the low-temperature heat-conducting liquid amount pumped in and the high-temperature heat-conducting liquid amount extracted are adjusted, and automatic balance of the pump man and the extracted displacement, pressure and temperature is achieved.
The utility model discloses but geothermal well three ring pressure crack circulation heat conduction system wide application in vertical well, directional well, the horizontal well of dry heat type and hydrothermal type geothermal layer.
Application example 1 vertical well application of deep high-temperature dry heating type geothermal layer
The first step is as follows: a vertical well is drilled at a deep high-temperature dry-heating geothermal layer (>150 ℃), a geothermal well casing at the middle part of the geothermal layer is perforated, fracturing is carried out by using self-generated foam fracturing fluid consisting of nanoscale high-heat-conductivity graphene, micron-sized heat-conductivity graphite combined propping agent, clean water, ammonium carbonate, polyethylene glycol, fluorocarbon and the like, and a large-area, vertical or high-angle outer-ring heat-conduction non-seepage microcrack 2 is formed in the geothermal layer 1.
The second step is that: and continuously fracturing by using micron-sized heat-conducting graphite, activated carbon combined propping agent and self-generated foam fracturing fluid consisting of clear water, ammonium carbonate, polyethylene glycol and fluorocarbon to form a vertical or high-angle middle-ring heat-conducting high-permeability main crack 3 in the geothermal layer 1.
The third step: and continuously fracturing and displacing by using self-generated foam fracturing fluid consisting of micron-sized high-temperature oil well cement, resin, clear water, ammonium carbonate, polyethylene glycol and fluorocarbon to form vertical or high-angle inner-ring heat-insulation low-permeability filling joints 4 on the geothermal layer 1.
The fourth step: and (4) installing and connecting ground circulating heat exchange equipment. The well mouth end of the geothermal well casing 5, the high-temperature heat-conducting liquid tank 9, the ground heat exchange station 11, the low-temperature heat-conducting liquid tank 12, the ground circulating pump 14 and the well mouth end of the heat-insulating oil pipe 8 are sequentially installed and connected in a positive circulation mode.
The fifth step: and opening and cleaning the middle ring heat-conducting high-permeability main crack. And (3) setting a lower packer 6, an upper packer 7 and a heat insulation oil pipe 8 into the geothermal well casing pipe by using the perforation holes at the upper part and the lower part of the geothermal layer 1 and the shooting hot well casing pipe 5, cleaning the communicated middle-ring heat conduction high-permeability main crack 2 by using the positive and negative circulation of acid liquor, and replacing all the acid liquor by using the circulation of low-temperature heat conduction liquid.
And a sixth step: and starting ground equipment for circulating heat conduction and heat exchange. The ground circulating pump 14 is started in a positive circulation mode, the low-temperature heat-conducting liquid 13 in the low-temperature heat-conducting liquid tank 12 is pumped into the heat-insulating oil pipe 8 to descend to the bottom of the well, and enters the middle-ring heat-conducting high-permeability main crack 3 from the lower hole of the geothermal well casing 5; the low-temperature heat-conducting liquid 13 flows in the middle-ring heat-conducting high-permeability main crack 3 and is heated by the geothermal layer 1 to be heated to become the high-temperature heat-conducting liquid 10; the high-temperature heat-conducting liquid 10 rises to the wellhead end of the geothermal well casing from the upper port of the middle-ring heat-conducting high-permeability main crack 3 through the upper eyelet of the geothermal well casing, enters the high-temperature heat-conducting liquid tank 9, is converted into low-temperature heat-conducting liquid 13 through the heat exchange of the ground heat exchange station 11, returns to the low-temperature heat-conducting liquid tank 12, and completes a cycle of heat-conducting heat exchange flow. According to the heat energy output demand of the ground heat exchange station, the low-temperature heat-conducting liquid amount pumped in and the high-temperature heat-conducting liquid amount extracted are adjusted, and automatic balance of the pump man and the extracted displacement, pressure and temperature is achieved.
The heat energy after the heat exchange is concentrated by the ground heat exchange station can be used for power generation, heating and hot water supply in residential areas. The heat-conducting liquid (heat-conducting oil) after being cooled by the ground heat exchange station can be repeatedly injected into the geothermal well for recycling. The large-area micro-gap net, high heat conduction and high heat exchange of a single-opening vertical well and single-phase heat conduction liquid (heat conduction oil) in a crack pressing circulation system are realized, only heat is taken, water is not used, the cost is low, and the deep high-temperature dry heat type geothermal energy is developed and utilized cleanly and efficiently.
Application example 2 horizontal well application in shallow low-temperature hydrothermal geothermal layer
The first step is as follows: a horizontal well is drilled at a shallow low-temperature hydrothermal geothermal layer (90 ℃), a hole is drilled at the middle part of a geothermal well casing 5 of a horizontal well section, fracturing is carried out by using low-temperature self-generated foam fracturing fluid consisting of nano-scale high-heat-conductivity graphene, micron-scale heat-conductivity graphite combined propping agent, clear water, ammonium bicarbonate and alkyl glucoside, and a large-area horizontal outer-ring heat-conduction seepage-prevention microcrack 2 is formed in the geothermal layer 1.
The second step is that: and continuously fracturing by using self-generated foam fracturing fluid consisting of micron-sized heat-conducting graphite, activated carbon, millimeter-sized ceramsite combined proppant and clean water, ammonium bicarbonate and alkyl glycoside, and forming a horizontal middle-ring heat-conducting high-permeability main crack 3 in the geothermal layer 1.
The third step: and fracturing by using micron-sized oil well cement, resin filling agent, clean water, ammonium bicarbonate and alkyl glycoside self-generated foam fracturing fluid continuously to form a horizontal inner-ring heat-insulation low-permeability filling seam 4 in the geothermal layer 1.
The fourth step: and (4) installing and connecting ground circulating heat exchange equipment. The well mouth end of the geothermal well casing 5, the high-temperature heat-conducting liquid tank 9, the ground heat exchange station 11, the low-temperature heat-conducting liquid tank 12, the ground circulating pump 14 and the well mouth end of the heat-insulating oil pipe 8 are sequentially installed and connected in a positive circulation mode.
The fifth step: and opening and cleaning the middle ring heat-conducting high-permeability main crack. A geothermal well casing 5 and upper and lower holes of a geothermal layer 1 which penetrate a horizontal section are arranged, a lower packer 6, an upper packer 7 and a heat insulation oil pipe 8 are arranged in the horizontal section in the geothermal well casing, a main heat conduction and high permeability crack 3 communicated with a middle ring is cleaned by positive and negative circulation of acid liquor, and the whole cleaning acid liquor is replaced by circulation of low-temperature heat conduction liquid;
and a sixth step: and starting ground equipment for circulating heat conduction and heat exchange. A ground circulating pump 14 is started in a positive circulating sequence, low-temperature heat-conducting liquid 13 in a low-temperature heat-conducting liquid tank 12 is pumped into a heat-insulating oil pipe 8 to descend to the bottom of the well, and enters a heat-conducting high-permeability main crack 3 from a lower hole of a geothermal well casing 5; the low-temperature heat-conducting liquid 13 flows in the middle-ring heat-conducting high-permeability main crack 3 and is heated by the geothermal layer 1 to be heated to become the high-temperature heat-conducting liquid 10; the high-temperature heat-conducting liquid 10 rises to the wellhead end of the geothermal well casing from the upper port of the middle-ring heat-conducting high-permeability main crack 3 through the upper eyelet of the geothermal well casing, enters the high-temperature heat-conducting liquid tank 9, is changed into low-temperature heat-conducting liquid 13 through heat exchange of the ground heat exchange station 11, returns to the low-temperature heat-conducting liquid tank 12, and completes a cycle of heat-conducting heat exchange flow. According to the heat energy output demand of the ground heat exchange station, the low-temperature heat-conducting liquid amount pumped in and the high-temperature heat-conducting liquid amount extracted are adjusted, and automatic balance of the pump man and the extracted displacement, pressure and temperature is achieved.
The heat energy after the heat exchange is concentrated by the ground heat exchange station can be used for heating and hot water supply in residential areas. Clear water after the ground heat exchange station is cooled can be repeatedly injected into the geothermal well for recycling, a single-port horizontal well and single-phase clear water are used for realizing three-ring pressure cracks of the geothermal well and a large-area and micro-crack net of a circulating heat conduction system, high heat conduction and high heat exchange are realized, only heat is taken, water is not collected, the cost is low, and the high-efficiency environment-friendly development and utilization of shallow low-temperature hydrothermal geothermal energy are wide.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (3)
1. A geothermal well three ring frac, comprising:
the outer ring conducts heat and does not leak microcracks;
the middle ring heat conduction high permeability main crack is positioned in the outer ring heat conduction non-permeability micro crack and is respectively provided with a middle ring heat conduction high permeability main crack upper port and a middle ring heat conduction high permeability main crack lower port; and
the inner ring heat-insulating non-seepage filling seam is positioned in the middle ring heat-conducting high-seepage main crack.
2. The geothermal well three-ring frack of claim 1, wherein the outer ring of thermally conductive microfractures are radially outward.
3. The utility model provides a geothermal well three ring crush fracture circulation heat conduction system which characterized in that, geothermal well three ring crush fracture circulation heat conduction system includes:
a geothermal well three-ring fracturing fracture which is the geothermal well three-ring fracturing fracture of any one of claims 1-2;
the geothermal well casing is respectively communicated with the lower port of the middle ring heat-conducting high-permeability main crack and the upper port of the middle ring heat-conducting high-permeability main crack;
a packer positioned within a geothermal well casing, the packer comprising a lower packer and an upper packer;
the heat insulation oil pipe is positioned in the geothermal well casing;
a low-temperature heat-conducting liquid tank;
a high-temperature heat-conducting liquid tank;
the ground circulating pump is respectively connected with the low-temperature heat-conducting liquid tank and the heat-insulating oil pipe; and
and the ground heat exchange station is respectively connected with the low-temperature heat conduction liquid tank and the high-temperature heat conduction liquid tank.
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Effective date of registration: 20221125 Address after: 610000 China (Sichuan) Pilot Free Trade Zone, Chengdu, Sichuan Province No. 1931, Building 2, No. 558, Chuangxin North Road, Xinglong Street, Tianfu New District, Chengdu Patentee after: CHENGDU JUDI ENERGY TECHNOLOGY Co.,Ltd. Address before: No.191, west section of Wan'an Road, Wan'an street, Tianfu New District, Chengdu, Sichuan 610000 Patentee before: Fu Rui |