CN114658395A - Method for improving recharge quantity of sandstone heat storage geothermal well - Google Patents
Method for improving recharge quantity of sandstone heat storage geothermal well Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000005338 heat storage Methods 0.000 title claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 166
- 238000005406 washing Methods 0.000 claims abstract description 26
- 238000010276 construction Methods 0.000 claims abstract description 14
- 239000010410 layer Substances 0.000 claims description 118
- 238000005086 pumping Methods 0.000 claims description 22
- 230000015572 biosynthetic process Effects 0.000 claims description 21
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- 238000011010 flushing procedure Methods 0.000 claims description 6
- 150000003839 salts Chemical class 0.000 claims description 6
- 239000004568 cement Substances 0.000 claims description 4
- 239000013078 crystal Substances 0.000 claims description 4
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
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- 238000004140 cleaning Methods 0.000 claims description 3
- 239000013049 sediment Substances 0.000 claims description 3
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- 230000000694 effects Effects 0.000 description 6
- 239000012535 impurity Substances 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- 230000003068 static effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
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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
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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
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
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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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
- E21B33/134—Bridging plugs
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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
- E21B37/00—Methods or apparatus for cleaning boreholes or wells
- E21B37/02—Scrapers specially adapted therefor
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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
- E21B43/11—Perforators; Permeators
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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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- 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
The invention belongs to the technical field of geothermal utilization, and discloses a method for improving the recharge quantity of a sandstone heat storage geothermal well. The main technical characteristics are as follows: firstly, carrying out geothermal well construction, and perforating at all aquifer positions; determining the pressure of each water-bearing layer of the geothermal well, selecting a water-bearing layer with small partial water pressure as a recharge layer, constructing the recharge well, perforating and washing the well at the selected recharge layer, sequentially perforating and washing the well from small to upper when the well is perforated and washed, plugging the lower part by using a water-stopping bridge plug, and more thoroughly washing the well. Not only the well forming time is improved, the well digging efficiency is improved, but also during recharging, the recharged water can easily enter the aquifer with low water pressure, the aquifer with high water pressure is not communicated with the well hole and cannot enter the aquifer with low water pressure through the inlet, and the recharging amount is increased.
Description
Technical Field
The invention belongs to the technical field of geothermal well and recharge well construction methods, and particularly relates to a method for improving the recharge quantity of a sandstone thermal storage geothermal well.
Background
Due to the special geological condition of sandstone heat storage, the recharge quantity of a sandstone geothermal well is low, the exploitation and utilization rate of geothermal heat is low, and recharge is a key problem which restricts the efficient exploitation and utilization of geothermal heating all the time, in particular to the recharge problem of sandstone heat storage in a ceramic group of a Librarian. The existing geothermal exploitation and utilization generally adopts the steps of pumping water in a geothermal well, and recharging the water through a recharging well after heat energy exchange. The construction of the recharging well and the geothermal well is basically the same, and the wells are perforated and washed on all aquifers. The geological conditions of the thermal reservoir have a fundamental decision function on recharging of sandstone thermal storage, all sandstone layers in the Librarian pottery group are generally formed into a large layer in the past research, but the Librarian pottery group stratum is composed of a plurality of sandstone and mudstone layers with different thicknesses, the lithology, thermophysical property, hydrodynamic force and other characteristics of each sandstone layer have certain differences, and the contribution of the Librarian pottery group stratum to recharging cannot be generally known. The existing recharging well has the following defects:
firstly, the recharge quantity is that the distance of the aquifer slurry with low water pressure permeating out of the hole is long in the well-forming process, the slurry is not easy to dredge in the well-flushing process, so that the aquifer can not be dredged, the recharge water can not enter the aquifer with low water pressure in the recharge process, the distance of the aquifer slurry with high water pressure permeating out of the hole is short, the slurry is easy to be flushed away in the well-flushing process, so that the aquifer is dredged, and the recharge water in the recharge process is difficult due to the high water pressure of the aquifer;
secondly, in the non-recharging process, the aquifer with high water pressure enters the aquifer with low water pressure through the well hole, so that the water pressure area of the aquifer with low water pressure is increased, and the recharging difficulty is increased during recharging.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for improving the recharge quantity of a sandstone heat storage geothermal well, which can improve the recharge quantity of the sandstone heat storage geothermal well and increase the exploitation and utilization efficiency of geothermal heat.
In order to solve the technical problems, the method for improving the recharge quantity of the sandstone heat storage geothermal well adopts the technical scheme that the method comprises the following steps:
first step geothermal well construction
Constructing a geothermal well according to regional stratum data, wherein the formation of the geothermal well adopts a well cementation perforation well formation process, and perforation is carried out at all aquifer positions according to a well logging result after geophysical logging;
second step cleaning the inner wall of the well pipe
Removing dirt such as cement, sandy soil, residual bullets, scratches, various salt crystals or sediments, perforation burrs, iron oxide generated after the sleeve is corroded and the like on the inner wall of the underground sleeve by using a sleeve scraper, and keeping the inner wall of the sleeve clean;
thirdly, after the geothermal well is washed and pumped for test
Carrying out well washing and water pumping tests on the geothermal well;
fourthly, determining the pressure of each aquifer of the geothermal well
The first step, measuring the first aquifer C on the geothermal well1Formation pressure of aquifer
In the first aquifer C1The solid pipe section below the aquifer is separated by a water stop bridge plug, and after the water level is stable, the still water level of the geothermal well is measured to obtain the water level H1Rice;
the second step, measuring the second aquifer C on the geothermal well2Formation pressure of aquifer
In the second aquifer C2A water-stopping bridge plug is arranged below the solid pipe at the lower part of the aquifer and a seal C is arranged2The aquifer is hydraulically connected to the lower part at C2Setting packer in the upper part of water-bearing layer, making the packer be hollow packer, making the drill rod and joint connected with packer do not leak, measuring water level in the drill rod, after the water level is stabilized obtaining water level H2Rice;
step three, measuring a third aquifer C on the geothermal well3Formation pressure of aquifer
In the third aquifer C3A water-stopping bridge plug is arranged below the solid pipe at the lower part of the aquifer and a seal C is arranged3The aquifer is hydraulically connected to the lower part at C3Setting packer in the upper part of water-bearing layer, making the packer be hollow packer, making the drill rod and joint connected with packer do not leak, measuring water level in the drill rod, after the water level is stabilized obtaining water level H3Rice;
step (four), continuously measuring the formation pressure of the lower aquifer
According to the third method, the formation pressure of the lower aquifers is continuously measured until the adjacent aquifer C above the lowermost aquifer is measuredn-1The stratum pressure of the aquifers and the water level of each aquifer are recorded;
step five, measuring a water-bearing stratum C of the bottommost surface layer of the geothermal wellnFormation pressure of aquifer
In the nth aquifer CnSetting packer in the upper part of water-bearing layer, making the packer be hollow packer, making the drill rod and joint connected with packer do not leak, measuring water level in the drill rod, after the water level is stabilized obtaining water level HnRice;
fifthly, determining a recharge aquifer
Combined with measured water level H1Rice, H2Rice, H3Rice, H4Rice … … HnRice, C in all aquifers1Layer, C2Layer, C3Layer … … CnSelecting partial aquifer with low pressure as recharge layer, and sequentially marking as G from top to bottom1Layer G2Layer G3Layer … … GmThe layer is used as a recharging layer;
sixthly, determining the position of the recharging well
Calculating an influence radius according to the geothermal well pumping test result, wherein the construction position of the recharging well is within the influence radius of the pumping well, and the optimal distance is 1/2-2/3 of the influence radius;
seventh step construction recharge well
Constructing a geothermal recharging well at the selected position;
eighth, perforating and well-flushing
The first step is to form a recharge layer G on the lowest determined layermPerforating and well-flushing at layer position
Jetting the lowest recharging layer GmAfter the layer, the opposite injection opening recharging layer GmThe well washing work is carried out on the layer, and the recharge layer G is thoroughly dredgedmA layer;
the second step, perforating and washing the well in the adjacent recharging layer above the recharging layer which is perforated to form the well and washed
A water-stop bridge plug is arranged between a recharging layer which is formed into a well through perforation and is washed and an upper adjacent recharging layer, so that the recharging layer which is formed and washed through perforation and is arranged below the recharging layer which is formed and washed through perforation is sealed, then the recharging layer which is formed and washed through perforation is formed and is washed through well, and the recharging layer is thoroughly dredged;
repeating the second step until reaching the uppermost recharge layer;
ninth, pumping geothermal water
Extracting geothermal water from each aquifer used by the geothermal well;
tenth step of utilizing heat energy of geothermal water
Extracting heat energy in the geothermal water through a heat exchange mechanism;
the tenth step, recharging
And recharging the treated water into a recharging layer of the recharging well.
The method for improving the recharge quantity of the sandstone thermal storage geothermal well comprises the steps of constructing the geothermal well according to regional stratum data, adopting a well cementation perforation well forming process for forming the geothermal well, and perforating at all aquifer positions according to a well logging result after geophysical logging; removing cement, sandy soil, residual bullets, scratches, various salt crystals or deposits on the inner wall of the underground casing by using a casing scraperDirt such as iron oxide and the like generated after the materials, the perforation burrs and the sleeve are corroded keeps the inner wall of the sleeve clean; carrying out well washing and water pumping tests on the geothermal well; in the first aquifer C1The solid pipe section below the aquifer is separated by a water stop bridge plug, and after the water level is stable, the still water level of the geothermal well is measured to obtain the water level H1Rice; in the second aquifer C2A water-stopping bridge plug is arranged below the solid pipe at the lower part of the aquifer and a seal C is arranged2The aquifer is hydraulically connected to the lower part at C2Setting packer in the upper part of water-bearing layer, making the packer be hollow packer, making the drill rod and joint connected with packer do not leak, measuring water level in the drill rod, after the water level is stabilized obtaining water level H2Rice; in the third aquifer C3A water-stopping bridge plug is arranged below the solid pipe at the lower part of the aquifer and a seal C is arranged3The aquifer is hydraulically connected to the lower part at C3Setting packer in the upper part of water-bearing layer, making the packer be hollow packer, making the drill rod and joint connected with packer do not leak, measuring water level in the drill rod, after the water level is stabilized obtaining water level H3Rice; continuing to measure the formation pressure of each aquifer below until the adjacent aquifer C above the lowest aquifer is measuredn-1The stratum pressure of the aquifers and the water level of each aquifer are recorded; in the nth aquifer CnSetting packer in the upper part of water-bearing layer, making the packer be hollow packer, making the drill rod and joint connected with packer do not leak, measuring water level in the drill rod, after the water level is stabilized obtaining water level HnRice; combined with measured water level H1Rice, H2Rice, H3Rice, H4Rice … … HnRice, C in all aquifers1Layer, C2Layer, C3Layer … … CnSelecting partial aquifer with low pressure as recharge layer, and sequentially marking as G from top to bottom1Layer G2Layer G3Layer … … GmThe layer is used as a recharging layer; calculating an influence radius according to the geothermal well pumping test result, wherein the construction position of the recharging well is within the influence radius of the pumping well, and the optimal distance is 1/2-2/3 of the influence radius; constructing a geothermal recharging well at the selected position; jetting the lowest recharging layer GmAfter the layer, the opposite injection opening recharging layer GmThe well washing work is carried out on the layer, and the recharge layer G is thoroughly dredgedmA layer; a water-stop bridge plug is arranged between a recharging layer which is formed into a well through perforation and is washed and an upper adjacent recharging layer, so that the recharging layer which is formed and washed through perforation and is arranged below the recharging layer which is formed and washed through perforation is sealed, then the recharging layer which is formed and washed through perforation is formed and is washed through well, and the recharging layer is thoroughly dredged; repeating the steps until the top recharging layer is reached; extracting geothermal water from each aquifer used by the geothermal well; extracting heat energy in the geothermal water through a heat exchange mechanism; and recharging the treated water into a recharging layer of the recharging well.
The method has the following advantages:
firstly, forming a geothermal well by newly-built perforation, carrying out thorough well washing and water pumping tests on the geothermal well, and acquiring data such as water quantity, water temperature and influence radius;
secondly, thoroughly removing impurities on the wall of the hole by using a sleeve scraper, particularly various salts, iron oxide and other impurities on the wall of the old geothermal well, and ensuring that the packer and the water stop plug have good water stop effect;
thirdly, sequentially sealing each aquifer in the geothermal well by using a water-stop bridge plug, a packer and a drill rod, measuring a stable water level in the middle of the drill rod, determining the formation pressure of each aquifer, wherein the underground water level with high formation pressure is high, and the underground water level with low formation pressure is low on the contrary, the well-washing quality of each aquifer does not influence the underground water level observation effect, the stable water level is obtained by observation, and the static stable water level can reflect the real underground water pressure even if the aquifer is not dredged very much according to the principle of a communicating vessel;
fourthly, in order to achieve an ideal recharging effect, the recharging well is arranged in the influence radius of the pumping well, and the optimal distance is 1/2-2/3 of the influence radius;
fifthly, selecting an aquifer with low water pressure as a recharge water layer of the recharge well, perforating the recharge well in the aquifer with low water pressure and washing the well, wherein the aquifer with high water pressure is a closed solid pipe, so that the well forming time is prolonged, the well digging efficiency is improved, and during recharge, the recharge water can easily enter the aquifer with low water pressure, but the aquifer with high water pressure is not communicated with a well hole and cannot enter the aquifer with low water pressure through an inlet, so that the recharge quantity is increased;
and sixthly, the aquifer of the recharge well is thoroughly dredged, and the recharge quantity is increased. After the recharging well is formed, the aquifer is jetted from bottom to top in sequence, the aquifer serving as the recharging layer is cleaned and dredged layer by utilizing well washing modes such as an air compressor, a submersible pump and a pull piston, the problem of aquifer blockage caused by the fact that mud is invaded into the aquifer more and penetrates far due to the small formation pressure is solved, and the recharging amount is further increased.
Drawings
FIG. 1 is a schematic diagram of the construction of a geothermal well according to the invention;
FIG. 2 is a schematic structural view of a recharge well of the present invention.
Detailed Description
The method for improving the recharge quantity of the sandstone heat storage geothermal well according to the invention is further described in detail with reference to the attached drawings and the specific implementation mode.
As shown in fig. 1, the geothermal well according to the present invention has a schematic structural view of a geothermal well including a geothermal well pipe 1, and a geological structure outside the geothermal well pipe 1 includes a blocking layer 2 and an aquifer 3, and geothermal water holes 4 are provided in the geothermal well pipe corresponding to the aquifer 3. As shown in fig. 2, the schematic structural diagram of the recharging well of the present invention includes a recharging well pipe 5, wherein an aquifer with low water pressure is selected as a recharging layer 6 according to the water pressure in each aquifer measured by the geothermal well, a recharging water hole 7 is formed in the recharging well pipe 5 at a position corresponding to the recharging layer 6 by a perforation well forming method, and a recharging well pipe at a position of an aquifer 8 with high water level is not perforated and is not used as a recharging layer.
The method for improving the recharge quantity of the sandstone heat storage geothermal well adopts the technical scheme that the method comprises the following steps:
first step geothermal well construction
Constructing a geothermal well according to regional stratum data, wherein the formation of the geothermal well adopts a well cementation perforation well formation process, and perforation is carried out at all aquifer positions according to a well logging result after geophysical logging;
second step cleaning the inner wall of the well pipe
Removing dirt such as cement, sandy soil, residual bullets, scratches, various salt crystals or sediments, perforation burrs, iron oxide generated after the sleeve is corroded and the like on the inner wall of the underground sleeve by using a sleeve scraper, and keeping the inner wall of the sleeve clean;
thirdly, after the well washing and pumping test of the geothermal well
Carrying out well washing and water pumping tests on the geothermal well;
fourthly, determining the pressure of each aquifer of the geothermal well
The first step, measuring the first aquifer C on the geothermal well1Formation pressure of aquifer
In the first aquifer C1The solid pipe section below the aquifer is separated by a water-stopping bridge plug, and after the water level is stable, the static water level of the geothermal well is measured to obtain the water level H1Rice;
the second step, measuring the second aquifer C on the geothermal well2Formation pressure of aquifer
In the second aquifer C2A water-stopping bridge plug is arranged below the solid pipe at the lower part of the aquifer and a seal C is arranged2The aquifer is hydraulically connected to the lower part at C2Setting packer in the upper part of water-bearing layer, making the packer be hollow packer, making the drill rod and joint connected with packer do not leak, measuring water level in the drill rod, after the water level is stabilized obtaining water level H2Rice;
step three, measuring a third aquifer C on the geothermal well3Formation pressure of aquifer
In the third aquifer C3A water-stopping bridge plug is arranged below the solid pipe at the lower part of the aquifer and is sealed and isolated by C3The aquifer is hydraulically connected with the lower part at C3Setting packer in the upper part of water-bearing layer, making the packer be hollow packer, making the drill rod and joint connected with packer do not leak, measuring water level in the drill rod, after the water level is stabilized obtaining water level H3Rice;
step (four), continuously measuring the formation pressure of the lower aquifer
According to the third method, the formation pressure of each aquifer below is continuously measured until the adjacent aquifer C above the lowest aquifer is measuredn-1The stratum pressure of the aquifers and the water level of each aquifer are recorded;
the fifth step of measuringGeothermal heat well bottommost surface layer aquifer CnFormation pressure of aquifer
In the nth aquifer CnSetting packer in the upper part of water-bearing layer, making the packer be hollow packer, making the drill rod and joint connected with packer do not leak, measuring water level in the drill rod, after the water level is stabilized obtaining water level HnRice;
fifthly, determining a recharge aquifer
Combined with measured water level H1Rice, H2Rice, H3Rice, H4Rice … … HnRice, C in all aquifers1Layer, C2Layer, C3Layer … … CnSelecting partial aquifer with low pressure as recharge layer, and sequentially marking as G from top to bottom1Layer, G2Layer, G3Layer … … GmThe layer is used as a recharging layer;
sixthly, determining the position of the recharging well
Calculating an influence radius according to the geothermal well pumping test result, wherein the construction position of the recharging well is within the influence radius of the pumping well, and the optimal distance is 1/2-2/3 of the influence radius;
seventh step construction recharge well
Constructing a geothermal recharging well at the selected position;
eighth step, perforating and well washing
First, a recharge layer G is formed on the lowest determined layermPerforating at layer position to form well and washing well
Jetting the lowest recharging layer GmAfter the layer, the recharge layer G is opened by opposite injectionmThe well washing work is carried out on the layer, and the recharge layer G is thoroughly dredgedmA layer;
the second step, perforating and washing the well on the adjacent recharging layer above the recharging layer which is perforated and washed
A water-stop bridge plug is arranged between a recharging layer which is formed into a well through perforation and is washed and an upper adjacent recharging layer, so that the recharging layer which is formed and washed through perforation and is arranged below the recharging layer which is formed and washed through perforation is sealed, then the recharging layer which is formed and washed through perforation is formed and is washed through well, and the recharging layer is thoroughly dredged;
repeating the second step until reaching the uppermost recharge layer;
ninth, pumping geothermal water
Extracting geothermal water from each aquifer used by the geothermal well;
tenth step of utilizing heat energy of geothermal water
Extracting heat energy in the geothermal water through a heat exchange mechanism;
the tenth step, recharging
And recharging the treated water into a recharging layer of the recharging well.
Firstly, forming a geothermal well by newly-built perforation, carrying out thorough well washing and water pumping tests on the geothermal well, and acquiring data such as water quantity, water temperature and influence radius;
secondly, thoroughly removing impurities on the wall of the hole by using a sleeve scraper, particularly various salts, iron oxide and other impurities on the wall of the old geothermal well, and ensuring that the packer and the water stop plug have good water stop effect;
thirdly, sequentially sealing each aquifer in the geothermal well by using a water-stop bridge plug, a packer and a drill rod, measuring the stable water level in the middle of the drill rod, determining the formation pressure of each aquifer, wherein the underground water level with high formation pressure is high, the underground water level with low formation pressure is low, and the well-washing quality of each water-containing group does not influence the underground water level observation effect, the stable water level is obtained by observation, and the static stable water level can also truly reflect the underground water pressure according to the communicating vessel principle even if the aquifer is not dredged very much;
fourthly, in order to achieve an ideal recharging effect, the recharging well is arranged in the influence radius of the pumping well, and the optimal distance is 1/2-2/3 of the influence radius;
fifthly, selecting a water-bearing layer with low water pressure as a recharge water layer of the recharge well, perforating the recharge well in the water-bearing layer with low water pressure and washing the well, wherein the water-bearing layer with high water pressure is a closed solid pipe, so that the well-forming time is improved, the well-digging efficiency is improved, and during recharge, recharge water can easily enter the water-bearing layer with low water pressure, but the water-bearing layer with high water pressure is not communicated with a well hole and cannot enter the water-bearing layer with low water pressure through an inlet, so that the recharge quantity is increased;
and sixthly, the aquifer of the recharge well is thoroughly dredged, and the recharge quantity is increased. After the recharge well is formed, the aquifer is jetted from bottom to top in sequence, the aquifer used as the recharge layer is cleaned and dredged layer by utilizing well washing modes such as an air compressor, a submersible pump, a pull piston and the like, the problem of aquifer blockage caused by the fact that mud invades into a large amount and penetrates far due to small formation pressure is solved, and the recharge quantity is further improved.
The protection scope of the present invention is not limited to the above-mentioned embodiments, and it falls within the protection scope of the present invention as long as the structure and method are the same as or similar to the method for increasing the recharge quantity of the sandstone heat storage geothermal well. The invention can also be used for the transformation of the old sandstone heat storage geothermal well.
Claims (1)
1. The method for improving the recharge quantity of the sandstone heat storage geothermal well is characterized by comprising the following steps of: the method comprises the following steps:
first step geothermal well construction
Constructing a geothermal well according to regional stratum data, wherein the formation of the geothermal well adopts a well cementation perforation well formation process, and perforation is carried out at all aquifer positions according to a well logging result after geophysical logging;
second step of cleaning the inner wall of the well pipe
Removing dirt such as cement, sandy soil, residual bullets, scratches, various salt crystals or sediments, perforation burrs, iron oxide generated after the sleeve is corroded and the like on the inner wall of the underground sleeve by using a sleeve scraper, and keeping the inner wall of the sleeve clean;
thirdly, after the well washing and pumping test of the geothermal well
Carrying out well washing and water pumping tests on the geothermal well;
fourthly, determining the pressure of each aquifer of the geothermal well
The first step, measuring the first aquifer C on the geothermal well1Formation pressure of aquifer
In the first aquifer C1The solid pipe section below the aquifer is separated by a water stop bridge plug, and after the water level is stable, the still water level of the geothermal well is measured to obtain the water level H1Rice;
the second step, measuring the second aquifer C on the geothermal well2Formation pressure of aquifer
In the second aquifer C2A water-stopping bridge plug is arranged below the solid pipe at the lower part of the aquifer and a seal C is arranged2The aquifer is hydraulically connected to the lower part at C2Setting packer in the upper part of water-bearing stratum, which is hollow, measuring the water level inside the drill rod without leakage, and obtaining water level H after the water level is stable2Rice;
step three, measuring a third aquifer C on the geothermal well3Formation pressure of aquifer
In the third aquifer C3A water-stopping bridge plug is arranged below the solid pipe at the lower part of the aquifer and a seal C is arranged3The aquifer is hydraulically connected to the lower part at C3Setting packer in the upper part of water-bearing layer, making the packer be hollow packer, making the drill rod and joint connected with packer do not leak, measuring water level in the drill rod, after the water level is stabilized obtaining water level H3Rice;
step (four), continuously measuring the formation pressure of the lower aquifer
According to the third method, the formation pressure of each aquifer below is continuously measured until the adjacent aquifer C above the lowest aquifer is measuredn-1The stratum pressure of the aquifers and the water level of each aquifer are recorded;
step five, measuring a water-bearing stratum C of the bottommost surface layer of the geothermal wellnFormation pressure of aquifer
In the nth aquifer CnSetting packer in the upper part of water-bearing layer, making the packer be hollow packer, making the drill rod and joint connected with packer do not leak, measuring water level in the drill rod, after the water level is stabilized obtaining water level HnRice;
fifthly, determining a recharge aquifer
Combined with measured water level H1Rice, H2Rice, H3Rice, H4Rice … … HnRice, C in all aquifers1Layer, C2Layer, C3Layer … … CnSelecting partial aquifer with low pressure as recharge layer, and sequentially marking as G from top to bottom1Layer G2Layer G3Layer … … GmThe layer is used as a recharging layer;
sixthly, determining the position of the recharging well
Calculating an influence radius according to the geothermal well pumping test result, wherein the construction position of the recharging well is within the influence radius of the pumping well, and the optimal distance is 1/2-2/3 of the influence radius;
seventh step construction recharge well
Constructing a geothermal recharging well at the selected position;
eighth, perforating and well-flushing
The first step is to form a recharge layer G on the lowest determined layermPerforating and well-flushing at layer position
Jetting the lowest recharging layer GmAfter the layer, the recharge layer G is opened by opposite injectionmThe well washing work is carried out on the layer, and the recharge layer G is thoroughly dredgedmA layer;
the second step, perforating and washing the well on the adjacent recharging layer above the recharging layer which is perforated and washed
A water-stop bridge plug is arranged between a recharging layer which is formed into a well through perforation and is washed and an upper adjacent recharging layer, so that the recharging layer which is formed and washed through perforation and is arranged below the recharging layer which is formed and washed through perforation is sealed, then the recharging layer which is formed and washed through perforation is formed and is washed through well, and the recharging layer is thoroughly dredged;
repeating the second step until reaching the uppermost recharge layer;
ninth, pumping geothermal water
Extracting geothermal water from each aquifer used by the geothermal well;
tenth step of utilizing heat energy of geothermal water
Extracting heat energy in the geothermal water through a heat exchange mechanism;
the tenth step, recharging
And recharging the treated water into a recharging layer of the recharging well.
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