CN114658395B - Method for improving recharge quantity of sandstone heat Chu Dere well - Google Patents
Method for improving recharge quantity of sandstone heat Chu Dere well Download PDFInfo
- Publication number
- CN114658395B CN114658395B CN202210389388.3A CN202210389388A CN114658395B CN 114658395 B CN114658395 B CN 114658395B CN 202210389388 A CN202210389388 A CN 202210389388A CN 114658395 B CN114658395 B CN 114658395B
- Authority
- CN
- China
- Prior art keywords
- well
- water
- layer
- recharging
- aquifer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 231
- 238000011010 flushing procedure Methods 0.000 claims abstract description 20
- 238000010276 construction Methods 0.000 claims abstract description 12
- 239000010410 layer Substances 0.000 claims description 186
- 230000015572 biosynthetic process Effects 0.000 claims description 21
- 241000209094 Oryza Species 0.000 claims description 20
- 235000007164 Oryza sativa Nutrition 0.000 claims description 20
- 238000005086 pumping Methods 0.000 claims description 20
- 235000009566 rice Nutrition 0.000 claims description 20
- 239000007787 solid Substances 0.000 claims description 14
- 238000012360 testing method Methods 0.000 claims description 13
- 238000005406 washing Methods 0.000 claims description 11
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 10
- 150000003839 salts Chemical class 0.000 claims description 6
- 230000003068 static effect Effects 0.000 claims description 6
- 239000004568 cement Substances 0.000 claims description 4
- 239000013078 crystal Substances 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims description 4
- 239000004576 sand Substances 0.000 claims description 4
- 239000013049 sediment Substances 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 claims description 3
- 239000002344 surface layer Substances 0.000 claims description 3
- 230000000694 effects Effects 0.000 description 7
- 239000012535 impurity Substances 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 238000005338 heat storage Methods 0.000 description 3
- 238000005553 drilling Methods 0.000 description 2
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 239000012466 permeate Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000002407 reforming Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B37/00—Methods or apparatus for cleaning boreholes or wells
- E21B37/02—Scrapers specially adapted therefor
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/11—Perforators; Permeators
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
Abstract
The invention belongs to the technical field of geothermal utilization, and discloses a method for improving the recharge quantity of a sandstone heat Chu Dere well. The main technical characteristics are as follows: firstly, performing geothermal well construction, and perforating at all positions of the aquifer; determining the pressure of each aquifer of the geothermal well, selecting part of the aquifer with small water pressure as a recharging layer, constructing the recharging well, perforating at the selected recharging layer position to form a well and flushing the well, sequentially carrying out perforation to form the well and flushing the well from small to top, and plugging the lower part by using a water-stopping bridge plug, so that the flushing is more thorough. Not only the well forming time is improved, the well digging efficiency is improved, but also when recharging is carried out, the recharged water easily enters the water-bearing layer with low water pressure, the water-bearing layer with high water pressure is not communicated with the well hole, and the water-bearing layer with low water pressure cannot enter through the inlet, so that the recharging quantity is increased.
Description
Technical Field
The invention belongs to the technical field of geothermal well and recharging well construction methods, and particularly relates to a method for improving the recharging quantity of a sandstone thermal Chu Dere well.
Background
Because of the special geological condition of sandstone thermal storage, the recharging amount of the sandstone geothermal well is lower, the geothermal development and utilization rate is lower, and recharging is always a key problem restricting the efficient development and utilization of geothermal heating, in particular to the recharging problem of the sandstone thermal storage of the liberty group. The existing geothermal exploitation and utilization generally adopts pumping water in a geothermal well, and the water is recharged through a recharging well after heat energy exchange. The recharging well and the geothermal well constructed in the past have basically the same structure, and perforation and well flushing are performed on all the water-bearing layers. The geological conditions of the thermal reservoir have basic determining effect on the recharging of sandstone thermal reservoirs, all sandstone layers in the librarian group are often generalized into one large layer in the previous research, but the librarian group stratum consists of multiple sandstone layers with different thicknesses, and the characteristics of lithology, thermophysics, hydrodynamic force and the like of each sandstone layer have certain differences, so that the contribution to the recharging cannot be summarized. The existing recharging well has the following defects:
firstly, the recharging amount is that the distance that the water-bearing layer slurry with low water pressure permeates outside the hole is long in the well forming process, the slurry is not easy to dredge in the well flushing process, so that the water-bearing layer cannot be dredged, recharging water cannot enter the water-bearing layer with low water pressure in recharging, the distance that the water-bearing layer slurry with high water pressure permeates outside the well is short, the slurry is easy to wash away in the well flushing process, the water-bearing layer is dredged, and recharging water is difficult to recharge due to the high water pressure of the water-bearing layer in recharging;
secondly, in the non-recharging process, the water-bearing layer with high water pressure can enter the water-bearing layer with low water pressure through the well hole, so that the water pressure area of the water-bearing layer 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 recharging quantity of a sandstone heat Chu Dere well, which can improve the recharging quantity of the sandstone heat storage geothermal well and increase the geothermal development and utilization efficiency.
In order to solve the technical problems, the method for improving the recharge quantity of the sandstone thermal storage geothermal well comprises the following steps:
first step geothermal well construction
Constructing a geothermal well at one glance according to regional stratum data, forming the geothermal well by adopting a well cementation perforation well forming process, performing physical detection well logging, and perforating at all water-bearing layer positions according to logging results;
second step cleaning the inner wall of the well pipe
The casing scraper is used for removing cement, sand, residual bullets, scratches, various salt crystals or sediments, perforation burrs, iron oxide and other dirt generated after the casing is rusted on the inner wall of the underground casing, so that the inner wall of the casing is kept clean;
after the third step of geothermal well flushing and pumping test
Carrying out well washing and water pumping tests on the geothermal well;
fourth step, determining the pressure of each aquifer of the geothermal well
Step one, measuring the first aquifer C above the geothermal well 1 Formation pressure of aquifer
In the first water-bearing layer C 1 The solid pipe section below the water-bearing layer 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 H 1 Rice;
step two, measuring the second water-bearing layer C on the geothermal well 2 Formation pressure of aquifer
In the second water-bearing layer C 2 A water-stopping bridge plug is arranged below a solid pipe at the lower part of the water-bearing layer, and a seal C is arranged 2 The aquifer is connected with lower water conservancy, at C 2 The packer is a medium-pass packer, a drill rod and a joint connected with the packer are not leaked, the water level in the drill rod is measured, and the water level H is obtained after the water level is stable 2 Rice;
step three, measuring the third water-bearing layer C on the geothermal well 3 Formation pressure of aquifer
In the third aquifer C 3 Water-stopping bridge installed under real pipe at lower part of water-bearing layerPlug, packing C 3 The aquifer is connected with lower water conservancy, at C 3 The packer is a medium-pass packer, a drill rod and a joint connected with the packer are not leaked, the water level in the drill rod is measured, and the water level H is obtained after the water level is stable 3 Rice;
step four, continuing to measure formation pressure of the lower aquifer
Continuing to measure the formation pressure of each aquifer below according to the method of (III) until the adjacent aquifer C above the lowest aquifer is measured n-1 The stratum pressure of the aquifer and recording the water level of each aquifer;
step five, measuring the water-bearing layer C of the lowest surface layer of the geothermal well n Formation pressure of aquifer
In the nth water-bearing layer C n The packer is a medium-pass packer, a drill rod and a joint connected with the packer are not leaked, the water level in the drill rod is measured, and the water level H is obtained after the water level is stable n Rice;
fifth step, determining the recharging aquifer
In combination with measured water level H 1 Rice, H 2 Rice, H 3 Rice, H 4 Rice … … H n Rice, C in the entire aquifer 1 Layer C 2 Layer C 3 Layer … … C n Selecting part of water-bearing layer with small pressure as recharging layer, and marking as G from top to bottom 1 Layer, G 2 Layer, G 3 Layer … … G m The layer is used as a recharging layer;
sixth step, 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 construction recharging well
Constructing a geothermal recharging well at the selected position;
eighth step, perforating to complete the well and washing the well
Step one, recharging at the determined lowest layerLayer G m Layer position perforation well-forming and well-flushing
Jet the lowest recharging layer G m After the layer, the opposite-jet recharging layer G m The layer is subjected to well flushing, and the recharging layer G is thoroughly dredged m A layer;
step two, perforating the adjacent recharging layer above the recharging layer which is perforated to form and wash the well
A water-stopping bridge plug is arranged between a recharging layer which is perforated and well-washed and an adjacent recharging layer above, so that the recharging layer which is perforated and formed and well-washed and the recharging layer which is perforated and well-washed below are closed, then the recharging layer which is perforated and formed and well-washed is perforated and well-washed, and the recharging layer is thoroughly dredged;
step (III), repeating the step (II) until reaching the uppermost recharging layer;
ninth, extracting geothermal water
Extracting geothermal water from each aquifer used in the geothermal well;
tenth step, utilizing heat energy of geothermal water
Extracting heat energy in the geothermal water through a heat exchange mechanism;
eleventh step, recharging
And recharging the treated water into a recharging layer of the recharging well.
According to the method for improving the recharge quantity of the sandstone heat Chu Dere well, a geothermal well is constructed at one glance according to regional stratum data, a well cementation perforation well-forming process is adopted for well formation of the geothermal well, and perforation is carried out at all water-bearing layer positions according to a well logging result after physical detection well; the casing scraper is used for removing cement, sand, residual bullets, scratches, various salt crystals or sediments, perforation burrs, iron oxide and other dirt generated after the casing is rusted on the inner wall of the underground casing, so that the inner wall of the casing is kept clean; carrying out well washing and water pumping tests on the geothermal well; in the first water-bearing layer C 1 The solid pipe section below the water-bearing layer 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 H 1 Rice; in the second water-bearing layer C 2 A water-stopping bridge plug is arranged below a solid pipe at the lower part of the water-bearing layer, and is sealedC 2 The aquifer is connected with lower water conservancy, at C 2 The packer is a medium-pass packer, a drill rod and a joint connected with the packer are not leaked, the water level in the drill rod is measured, and the water level H is obtained after the water level is stable 2 Rice; in the third aquifer C 3 A water-stopping bridge plug is arranged below a solid pipe at the lower part of the water-bearing layer, and a seal C is arranged 3 The aquifer is connected with lower water conservancy, at C 3 The packer is a medium-pass packer, a drill rod and a joint connected with the packer are not leaked, the water level in the drill rod is measured, and the water level H is obtained after the water level is stable 3 Rice; continuing to measure the stratum pressure of each water-bearing layer below until the adjacent water-bearing layer C above the lowest water-bearing layer is measured n-1 The stratum pressure of the aquifer and recording the water level of each aquifer; in the nth water-bearing layer C n The packer is a medium-pass packer, a drill rod and a joint connected with the packer are not leaked, the water level in the drill rod is measured, and the water level H is obtained after the water level is stable n Rice; in combination with measured water level H 1 Rice, H 2 Rice, H 3 Rice, H 4 Rice … … H n Rice, C in the entire aquifer 1 Layer C 2 Layer C 3 Layer … … C n Selecting part of water-bearing layer with small pressure as recharging layer, and marking as G from top to bottom 1 Layer, G 2 Layer, G 3 Layer … … G m The 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; jet the lowest recharging layer G m After the layer, the opposite-jet recharging layer G m The layer is subjected to well flushing, and the recharging layer G is thoroughly dredged m A layer; a water-stopping bridge plug is arranged between a recharging layer which is perforated and well-washed and an adjacent recharging layer above, so that the recharging layer which is perforated and formed and well-washed and the recharging layer which is perforated and well-washed below are closed, then the recharging layer which is perforated and formed and well-washed is perforated and well-washed, and the recharging layer is thoroughly dredged; repeating the above steps untilTo the uppermost recharging layer; extracting geothermal water from each aquifer used in 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 using a newly-built perforation, and performing thorough well flushing and water pumping tests on the geothermal well to obtain data such as water quantity, water temperature, influence radius and the like;
secondly, thoroughly removing impurities on the hole wall by using a sleeve scraper, especially various salts, ferric oxide and other impurities on the wall of the old geothermal well, and ensuring good water stopping effect of the packer and the water stopping plug;
thirdly, sequentially sealing each water-bearing layer in the geothermal well by using a water-stopping bridge plug, a packer and a drill rod, measuring the stable water level in the middle of the drill rod, determining the stratum pressure of each water-bearing layer, wherein the underground water level with high stratum pressure is high, the underground water level with small stratum pressure is low, the quality of each water-bearing group well washing does not influence the observation effect of the underground water level, the stable water level is observed, and even if the water-bearing layer is not dredged very much, the static stable water level can truly reflect the underground water pressure according to the principle of a communicating vessel;
fourthly, in order to achieve the ideal recharging effect, the recharging well should be arranged in the influence radius of the pumping well, and the optimal distance is 1/2-2/3 of the influence radius;
fifthly, a water-bearing layer with low water pressure is selected as a recharging water layer of the recharging well, well perforation is carried out on the water-bearing layer with low water pressure, well flushing is carried out, and the water-bearing layer with high water pressure is a closed solid pipe, so that the well forming time is improved, the well drilling efficiency is improved, and when recharging is carried out, the recharged water easily enters the water-bearing layer with low water pressure, 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, and the recharging quantity is increased;
sixth, thoroughly dredge the aquifer of recharging well, increase recharging quantity. The water-bearing layer is sequentially ejected from bottom to top after the recharging well is completed, the water-bearing layer serving as the recharging layer is cleaned and dredged layer by utilizing a well washing mode such as an air compressor, a submersible pump, a pull piston and the like, the problem that the water-bearing layer is blocked due to the fact that small mud under formation pressure invades a plurality of penetration distances is solved, and the recharging quantity is further improved.
Drawings
FIG. 1 is a schematic view of the structure of a geothermal well according to the present invention;
FIG. 2 is a schematic diagram of the recharging well according to the present invention.
Detailed Description
The method for improving the recharging amount of the sandstone heat storage geothermal well according to the invention is further described in detail below with reference to the accompanying drawings and the detailed description.
As shown in fig. 1, the geothermal well of the present invention comprises a geothermal well pipe 1, wherein the geological structure outside the geothermal well pipe 1 comprises a barrier layer 2 and an aquifer 3, and a geothermal water hole 4 is provided in the geothermal well pipe corresponding to the aquifer 3. As shown in fig. 2, the structure of the recharging well of the present invention comprises a recharging well pipe 5, wherein an aquifer with low water content is selected as a recharging layer 6 according to the water pressure in each aquifer measured by the geothermal well, the recharging well pipe 5 at the position corresponding to the recharging layer 6 is provided with a recharging water hole 7 by a perforation well forming method, and the recharging well pipe at the position of the aquifer 8 with high water content is not perforated and is not used as the recharging layer.
The technical scheme adopted by the method for improving the recharging quantity of the sandstone thermal storage geothermal well comprises the following steps:
first step geothermal well construction
Constructing a geothermal well at one glance according to regional stratum data, forming the geothermal well by adopting a well cementation perforation well forming process, performing physical detection well logging, and perforating at all water-bearing layer positions according to logging results;
second step cleaning the inner wall of the well pipe
The casing scraper is used for removing cement, sand, residual bullets, scratches, various salt crystals or sediments, perforation burrs, iron oxide and other dirt generated after the casing is rusted on the inner wall of the underground casing, so that the inner wall of the casing is kept clean;
after the third step of geothermal well flushing and pumping test
Carrying out well washing and water pumping tests on the geothermal well;
fourth step, determining the pressure of each aquifer of the geothermal well
Step one, measuring the first aquifer C above the geothermal well 1 Formation pressure of aquifer
In the first water-bearing layer C 1 The solid pipe section below the water-bearing layer 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 H 1 Rice;
step two, measuring the second water-bearing layer C on the geothermal well 2 Formation pressure of aquifer
In the second water-bearing layer C 2 A water-stopping bridge plug is arranged below a solid pipe at the lower part of the water-bearing layer, and a seal C is arranged 2 The aquifer is connected with lower water conservancy, at C 2 The packer is a medium-pass packer, a drill rod and a joint connected with the packer are not leaked, the water level in the drill rod is measured, and the water level H is obtained after the water level is stable 2 Rice;
step three, measuring the third water-bearing layer C on the geothermal well 3 Formation pressure of aquifer
In the third aquifer C 3 A water-stopping bridge plug is arranged below a solid pipe at the lower part of the water-bearing layer, and a seal C is arranged 3 The aquifer is connected with lower water conservancy, at C 3 The packer is a medium-pass packer, a drill rod and a joint connected with the packer are not leaked, the water level in the drill rod is measured, and the water level H is obtained after the water level is stable 3 Rice;
step four, continuing to measure formation pressure of the lower aquifer
Continuing to measure the formation pressure of each aquifer below according to the method of (III) until the adjacent aquifer C above the lowest aquifer is measured n-1 The stratum pressure of the aquifer and recording the water level of each aquifer;
step five, measuring the water-bearing layer C of the lowest surface layer of the geothermal well n Formation pressure of aquifer
In the nth water-bearing layer C n The packer is a medium-pass packer, a drill rod and a joint connected with the packer are not leaked, the water level in the drill rod is measured, and the water is obtained after the water level is stableBit H n Rice;
fifth step, determining the recharging aquifer
In combination with measured water level H 1 Rice, H 2 Rice, H 3 Rice, H 4 Rice … … H n Rice, C in the entire aquifer 1 Layer C 2 Layer C 3 Layer … … C n Selecting part of water-bearing layer with small pressure as recharging layer, and marking as G from top to bottom 1 Layer, G 2 Layer, G 3 Layer … … G m The layer is used as a recharging layer;
sixth step, 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 construction recharging well
Constructing a geothermal recharging well at the selected position;
eighth step, perforating to complete the well and washing the well
Step one, a recharging layer G at the determined lowest end m Layer position perforation well-forming and well-flushing
Jet the lowest recharging layer G m After the layer, the opposite-jet recharging layer G m The layer is subjected to well flushing, and the recharging layer G is thoroughly dredged m A layer;
step two, perforating the adjacent recharging layer above the recharging layer which is perforated to form and wash the well
A water-stopping bridge plug is arranged between a recharging layer which is perforated and well-washed and an adjacent recharging layer above, so that the recharging layer which is perforated and formed and well-washed and the recharging layer which is perforated and well-washed below are closed, then the recharging layer which is perforated and formed and well-washed is perforated and well-washed, and the recharging layer is thoroughly dredged;
step (III), repeating the step (II) until reaching the uppermost recharging layer;
ninth, extracting geothermal water
Extracting geothermal water from each aquifer used in the geothermal well;
tenth step, utilizing heat energy of geothermal water
Extracting heat energy in the geothermal water through a heat exchange mechanism;
eleventh step, recharging
And recharging the treated water into a recharging layer of the recharging well.
Firstly, forming a geothermal well by using a newly-built perforation, and performing thorough well flushing and water pumping tests on the geothermal well to obtain data such as water quantity, water temperature, influence radius and the like;
secondly, thoroughly removing impurities on the hole wall by using a sleeve scraper, especially various salts, ferric oxide and other impurities on the wall of the old geothermal well, and ensuring good water stopping effect of the packer and the water stopping plug;
thirdly, sequentially sealing each water-bearing layer in the geothermal well by using a water-stopping bridge plug, a packer and a drill rod, measuring the stable water level in the middle of the drill rod, determining the stratum pressure of each water-bearing layer, wherein the underground water level with high stratum pressure is high, the underground water level with small stratum pressure is low, the quality of each water-bearing group well washing does not influence the observation effect of the underground water level, the stable water level is observed, and even if the water-bearing layer is not dredged very much, the static stable water level can truly reflect the underground water pressure according to the principle of a communicating vessel;
fourthly, in order to achieve the ideal recharging effect, the recharging well should be arranged in the influence radius of the pumping well, and the optimal distance is 1/2-2/3 of the influence radius;
fifthly, a water-bearing layer with low water pressure is selected as a recharging water layer of the recharging well, well perforation is carried out on the water-bearing layer with low water pressure, well flushing is carried out, and the water-bearing layer with high water pressure is a closed solid pipe, so that the well forming time is improved, the well drilling efficiency is improved, and when recharging is carried out, the recharged water easily enters the water-bearing layer with low water pressure, 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, and the recharging quantity is increased;
sixth, thoroughly dredge the aquifer of recharging well, increase recharging quantity. The water-bearing layer is sequentially ejected from bottom to top after the recharging well is completed, the water-bearing layer serving as the recharging layer is cleaned and dredged layer by utilizing a well washing mode such as an air compressor, a submersible pump, a pull piston and the like, the problem that the water-bearing layer is blocked due to the fact that small mud under formation pressure invades a plurality of penetration distances is solved, and the recharging quantity is further improved.
The protection scope of the present invention is not limited to the above embodiments, and 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 of the present invention for increasing the recharge amount of the sandstone thermal storage geothermal well. The invention can also be used for reforming old sandstone heat storage geothermal wells.
Claims (1)
1. The method for improving the recharging amount of the sandstone heat Chu Dere well is characterized by comprising the following steps of: the method comprises the following steps:
first step geothermal well construction
Constructing a geothermal well at one glance according to regional stratum data, forming the geothermal well by adopting a well cementation perforation well forming process, performing physical detection well logging, and perforating at all water-bearing layer positions according to logging results;
second step cleaning the inner wall of the well pipe
The casing scraper is used for removing cement, sand, residual bullets, scratches, various salt crystals or sediments, perforation burrs, iron oxide and other dirt generated after the casing is rusted on the inner wall of the underground casing, so that the inner wall of the casing is kept clean;
after the third step of geothermal well flushing and pumping test
Carrying out well washing and water pumping tests on the geothermal well;
fourth step, determining the pressure of each aquifer of the geothermal well
Step one, measuring the first aquifer C above the geothermal well 1 Formation pressure of aquifer
In the first water-bearing layer C 1 The solid pipe section below the water-bearing layer 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 H 1 Rice;
step two, measuring the second water-bearing layer C on the geothermal well 2 Formation pressure of aquifer
In the second water-bearing layer C 2 A water-stopping bridge plug is arranged below a solid pipe at the lower part of the water-bearing layer, and a seal C is arranged 2 The aquifer is connected with lower water conservancy, at C 2 Run in the solid pipe at the upper part of the aquiferThe packer is a middle-through packer, a drill rod and a joint connected with the packer are not leaked, the water level in the drill rod is measured, and the water level H is obtained after the water level is stable 2 Rice;
step three, measuring the third water-bearing layer C on the geothermal well 3 Formation pressure of aquifer
In the third aquifer C 3 A water-stopping bridge plug is arranged below a solid pipe at the lower part of the water-bearing layer, and a seal C is arranged 3 The aquifer is connected with lower water conservancy, at C 3 The packer is a medium-pass packer, a drill rod and a joint connected with the packer are not leaked, the water level in the drill rod is measured, and the water level H is obtained after the water level is stable 3 Rice;
step four, continuing to measure formation pressure of the lower aquifer
Continuing to measure the formation pressure of each aquifer below according to the method of (III) until the adjacent aquifer C above the lowest aquifer is measured n-1 The stratum pressure of the aquifer and recording the water level of each aquifer;
step five, measuring the water-bearing layer C of the lowest surface layer of the geothermal well n Formation pressure of aquifer
In the nth water-bearing layer C n The packer is a medium-pass packer, a drill rod and a joint connected with the packer are not leaked, the water level in the drill rod is measured, and the water level H is obtained after the water level is stable n Rice;
fifth step, determining the recharging aquifer
In combination with measured water level H 1 Rice, H 2 Rice, H 3 Rice, H 4 Rice … … H n Rice, C in the entire aquifer 1 Layer C 2 Layer C 3 Layer … … C n Selecting part of water-bearing layer with small pressure as recharging layer, and marking as G from top to bottom 1 Layer, G 2 Layer, G 3 Layer … … G m The layer is used as a recharging layer;
sixth step, 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 construction recharging well
Constructing a geothermal recharging well at the selected position;
eighth step, perforating to complete the well and washing the well
Step one, a recharging layer G at the determined lowest end m Layer position perforation well-forming and well-flushing
Jet the lowest recharging layer G m After the layer, the opposite-jet recharging layer G m The layer is subjected to well flushing, and the recharging layer G is thoroughly dredged m A layer;
step two, perforating the adjacent recharging layer above the recharging layer which is perforated to form and wash the well
A water-stopping bridge plug is arranged between a recharging layer which is perforated and well-washed and an adjacent recharging layer above, so that the recharging layer which is perforated and formed and well-washed and the recharging layer which is perforated and well-washed below are closed, then the recharging layer which is perforated and formed and well-washed is perforated and well-washed, and the recharging layer is thoroughly dredged;
step (III), repeating the step (II) until reaching the uppermost recharging layer;
ninth, extracting geothermal water
Extracting geothermal water from each aquifer used in the geothermal well;
tenth step, utilizing heat energy of geothermal water
Extracting heat energy in the geothermal water through a heat exchange mechanism;
eleventh step, recharging
And recharging the treated water into a recharging layer of the recharging well.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210389388.3A CN114658395B (en) | 2022-04-14 | 2022-04-14 | Method for improving recharge quantity of sandstone heat Chu Dere well |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210389388.3A CN114658395B (en) | 2022-04-14 | 2022-04-14 | Method for improving recharge quantity of sandstone heat Chu Dere well |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114658395A CN114658395A (en) | 2022-06-24 |
| CN114658395B true CN114658395B (en) | 2024-02-23 |
Family
ID=82035011
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210389388.3A Active CN114658395B (en) | 2022-04-14 | 2022-04-14 | Method for improving recharge quantity of sandstone heat Chu Dere well |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114658395B (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0762695A (en) * | 1993-08-27 | 1995-03-07 | Shimizu Corp | Stratified pumping equipment and well with stratified pumping equipment |
| CN104594889A (en) * | 2014-11-13 | 2015-05-06 | 西安精实信石油科技开发有限责任公司 | Device and method for accurately measuring position of residual oil reservoir of oil well |
| CN110131781A (en) * | 2019-04-29 | 2019-08-16 | 中国科学院广州能源研究所 | A kind of mid-deep strata underground heat adopts fill system with well |
| CN110468907A (en) * | 2019-08-21 | 2019-11-19 | 山东省水利科学研究院 | A kind of multi-aquifer underground water given layer closing pumping and filling device |
| CN111609576A (en) * | 2020-06-12 | 2020-09-01 | 东北石油大学 | Device for realizing synchronous exploitation and recharge of geothermal water by utilizing waste oil well |
| CN111927403A (en) * | 2020-07-11 | 2020-11-13 | 山东地子新能源科技有限公司 | Water pumping gravel-making recharging well and well forming process |
| CN112197448A (en) * | 2020-09-07 | 2021-01-08 | 河北省地矿局国土资源勘查中心 | Geothermal development system |
| CN113062718A (en) * | 2021-03-31 | 2021-07-02 | 中国华能集团有限公司河北雄安分公司 | Fracturing and recharging integrated geothermal mining and recharging system and method |
| CN113153223A (en) * | 2021-03-23 | 2021-07-23 | 河北省地矿局第三水文工程地质大队 | Sandstone-type water outlet geothermal well and recharge well construction method |
-
2022
- 2022-04-14 CN CN202210389388.3A patent/CN114658395B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0762695A (en) * | 1993-08-27 | 1995-03-07 | Shimizu Corp | Stratified pumping equipment and well with stratified pumping equipment |
| CN104594889A (en) * | 2014-11-13 | 2015-05-06 | 西安精实信石油科技开发有限责任公司 | Device and method for accurately measuring position of residual oil reservoir of oil well |
| CN110131781A (en) * | 2019-04-29 | 2019-08-16 | 中国科学院广州能源研究所 | A kind of mid-deep strata underground heat adopts fill system with well |
| CN110468907A (en) * | 2019-08-21 | 2019-11-19 | 山东省水利科学研究院 | A kind of multi-aquifer underground water given layer closing pumping and filling device |
| CN111609576A (en) * | 2020-06-12 | 2020-09-01 | 东北石油大学 | Device for realizing synchronous exploitation and recharge of geothermal water by utilizing waste oil well |
| CN111927403A (en) * | 2020-07-11 | 2020-11-13 | 山东地子新能源科技有限公司 | Water pumping gravel-making recharging well and well forming process |
| CN112197448A (en) * | 2020-09-07 | 2021-01-08 | 河北省地矿局国土资源勘查中心 | Geothermal development system |
| CN113153223A (en) * | 2021-03-23 | 2021-07-23 | 河北省地矿局第三水文工程地质大队 | Sandstone-type water outlet geothermal well and recharge well construction method |
| CN113062718A (en) * | 2021-03-31 | 2021-07-02 | 中国华能集团有限公司河北雄安分公司 | Fracturing and recharging integrated geothermal mining and recharging system and method |
Non-Patent Citations (1)
| Title |
|---|
| 砂岩孔隙型回灌井成井工艺探析――以天津市滨海新区馆陶组热储为例;沈健;王连成;赵艳婷;;中国房地产;20160725(21);全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114658395A (en) | 2022-06-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN208966316U (en) | A kind of U-shaped horizontal well | |
| CN105317407A (en) | Development method of untabulated reservoir in extra-high water-cut period | |
| CN109386285B (en) | Evaluation method for ultra-low permeability reservoir slurry invasion degree and influence thereof | |
| CN113153223B (en) | Sandstone-type water outlet geothermal well and recharge well construction method | |
| Chapuis et al. | Effects of installation of piezometers and wells on groundwater characteristics and measurements | |
| CN111395995B (en) | Secondary well completion method for aquifer energy storage well | |
| CN109610525A (en) | A kind of method of quick judgement water-stop curtain construction quality | |
| Brassington et al. | Field techniques using borehole packers in hydrogeological investigations | |
| CN107575159A (en) | Heat-exchange tube mounting process in a kind of geothermal well well | |
| CN114647957A (en) | Acid fracturing effect evaluation method based on acid fracturing 'transformation area' theory | |
| CN114658395B (en) | Method for improving recharge quantity of sandstone heat Chu Dere well | |
| Clementz et al. | Stimulation of water injection wells in the Los Angeles basin by using sodium hypochlorite and mineral acids | |
| CN113006755A (en) | Method for fracturing transformation of interlayer in SAGD (steam assisted gravity drainage) mining mode | |
| CN105257288A (en) | Method for determining tight reservoir original reservoir pressure based on injection pressure decline well testing technology | |
| Batias et al. | Field and laboratory observations of Remaining oil saturations in a light oil reservoir flooded by a low salinity aquifer | |
| Bjelm | Under balanced drilling and possible well bore damage in low temperature geothermal environments | |
| CN101240693B (en) | Method for carrying dry well casing after gas drilling | |
| Tulinius et al. | Stimulating a high enthalpy well by thermal cracking | |
| Huenges et al. | The in-situ geothermal laboratory Groß Schönebeck: learning to use low permeability aquifers for geothermal power | |
| Shen et al. | Analysis of settlement due to withdrawal of groundwater around an unexcavated foundation pit | |
| Roberts et al. | The design of groundwater control systems using the observational method | |
| Kim et al. | Simulation study on UBGH2-6 deposit in the Ulleung Basin considering hydrate bearing sediments and saturation distribution characteristics | |
| Rivero et al. | Cano Limon field, Colombia: the latest giant oil reservoir in South America | |
| Kuanliang et al. | Pilot test of horizontal drilling and completion techniques in Nanpu Oilfield | |
| Bunn et al. | Distributed pressure measurements allow early quantification of reservoir dynamics in the Jene field |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |