CN113153223B - Sandstone-type water outlet geothermal well and recharge well construction method - Google Patents
Sandstone-type water outlet geothermal well and recharge well construction method Download PDFInfo
- Publication number
- CN113153223B CN113153223B CN202110306060.6A CN202110306060A CN113153223B CN 113153223 B CN113153223 B CN 113153223B CN 202110306060 A CN202110306060 A CN 202110306060A CN 113153223 B CN113153223 B CN 113153223B
- Authority
- CN
- China
- Prior art keywords
- well
- water
- aquifer
- recharging
- recharge
- 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
Images
Classifications
-
- 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
-
- 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
-
- 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
-
- 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
- E21B43/02—Subsoil filtering
- E21B43/04—Gravelling of wells
-
- 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
-
- 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
- E21B47/00—Survey of boreholes or wells
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
-
- 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
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
- G06F30/28—Design optimisation, verification or simulation using fluid dynamics, e.g. using Navier-Stokes equations or computational fluid dynamics [CFD]
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/14—Force analysis or force optimisation, e.g. static or dynamic forces
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Hydrology & Water Resources (AREA)
- Mathematical Optimization (AREA)
- Combustion & Propulsion (AREA)
- Algebra (AREA)
- Computing Systems (AREA)
- Chemical & Material Sciences (AREA)
- Mathematical Analysis (AREA)
- Sustainable Development (AREA)
- Mathematical Physics (AREA)
- Pure & Applied Mathematics (AREA)
- Computer Hardware Design (AREA)
- Evolutionary Computation (AREA)
- Geometry (AREA)
- Sustainable Energy (AREA)
- Geophysics (AREA)
- Geophysics And Detection Of Objects (AREA)
Abstract
The invention belongs to the technical field of geothermal well and recharging well construction methods, and discloses a sandstone-type water outlet geothermal well and a recharging well construction method. The main technical characteristics are as follows: the outlet geothermal well utilizes the aquifer of all the water-containing groups of the thermal storage section; the pressure in each aquifer in the water-containing group is measured through the water outlet geothermal well, when the recharge well is formed, the recharge layer of the recharge well is arranged in the aquifer with low underground water pressure and high water permeability coefficient, and blind pipes are adopted in other aquifers, so that water in the aquifer with high pressure cannot flow into the aquifer with low pressure and high water permeability coefficient through the recharge well, the water recharged through the recharge well quickly enters the aquifer where the recharge layer is located, the recharge speed is high, the recharge quantity is large, and the recharge efficiency is high; the distance from the recharge well to the water outlet geothermal well is 1/2-2/3 of the influence radius of the water outlet geothermal well, so that the recharge quantity is ensured, and the groundwater recharge heat breakthrough can be prevented.
Description
Technical Field
The invention belongs to the technical field of a sandstone-type geothermal well construction method, and particularly relates to a sandstone-type water outlet geothermal well and recharge well construction method.
Background
Geothermal heat is a clean, inexpensive, renewable and directly utilizable new energy source. The geothermal resources are developed and utilized to replace a large amount of petrochemical energy such as coal, natural gas and the like, the existing energy structure is favorably improved, the energy consumption and the cost are favorably reduced, and the waste gas, dust, noise pollution and the like are favorably reduced to the maximum extent. According to estimation, the currently explored exploitable geothermal resource in China is equivalent to the calorific value of 3284 ten thousand tons of standard coal each year. According to the calculation of discharging 22.6kg of carbon dioxide, 17.87kg of sulfur dioxide, 15.39kg of smoke dust, 7.50kg of industrial dust and 96.06kg of industrial solid waste into the environment by consuming one ton of standard coal on average, the amount of discharged carbon dioxide is reduced by 742180 tons, the amount of discharged sulfur dioxide is reduced by 586851 tons, the amount of discharged smoke dust is reduced by 505408 tons, the amount of discharged industrial dust is reduced by 246300 tons, the amount of discharged industrial solid waste is reduced by 3154610 tons and the like every year when geothermal resources are exploited, so that the development of geothermal resources is significant for energy conservation and environmental protection.
Since the 90 s of the 20 th century, with the development of national economy, the improvement of the living standard of people, particularly the vigorous development of tourism and land and house industries and strong market demand, the exploration and development of geothermal resources are promoted, more and more regions develop geothermal resources, and geothermal wells are drilled deeper and deeper (exceeding 4000 m).
Geothermal abandoned water recharge is an important means for implementing geothermal resource protection and sustainable development and utilization. Geothermal abandoned water recharge plays an important role in maintaining heat storage pressure and reducing pollution. Currently, there are the following problems in terms of geothermal heat utilization: firstly, in order to reduce the utilization cost of geothermal energy, the geothermal energy is simply equivalent to the common water resource development, and the water resource is only extracted and not filled. The existing geothermal recharging wells in China only account for 14.5 percent of the production wells, and the recharging amount is only 5 percent of the production amount. The development of geothermal resources is seriously influenced, and the problems of water level reduction, temperature reduction, resource exhaustion, ground settlement and the like occur in many places; and secondly, the water taking layer of the water outlet geothermal well and the recharge layer of the recharge well are arranged in all the aquifers in the same aquifer, and due to the fact that geological structures in different aquifers in the same aquifer are different, underground water pressure and water permeability coefficients in different aquifers are different, water in the aquifers with large underground water pressure flows to the aquifers with small pressure and high water permeability coefficients due to the fact that water in different aquifers has different pressure differences and different water permeability coefficients, the recharge quantity and the recharge efficiency are affected, and the recharge quantity is low.
Disclosure of Invention
The invention aims to solve the technical problem of providing a sandstone-type water outlet geothermal well with high recharging efficiency, small environmental pollution and large recharging amount and a recharging well construction method.
In order to solve the problems, the technical scheme adopted by the construction method of the sandstone-type water outlet geothermal well and the recharge well is as follows: the method comprises the following steps:
first, geothermal well construction
Constructing a water outlet geothermal well according to regional stratum data, wherein the water outlet geothermal well utilizes a water-bearing stratum of all water-bearing groups of the heat storage section;
secondly, measuring the water flow between each adjacent aquifer in the aquifer by using the flow probe and recording the water flow between each adjacent aquifer
After the water level in the water outlet geothermal well is stable, according to regional stratum data and the water outlet geothermal well, the flow probes are sequentially placed at the corresponding positions in the water outlet geothermal well between every two adjacent aquifers, the flow between every two adjacent aquifers in the water outlet geothermal well is recorded, and the flow above the first aquifer counted from the top is Q0=0, and the flow rate between the first aquifer and the second aquifer is Q1The flow rate between the second aquifer and the third aquifer is Q2… …, the flow rate between the n-1 st layer and the n-th aquifer being Qn-1，
Thirdly, calculating the pressure of water outside each water-containing layer and the pressure in the pipe body according to the flow between every two adjacent water-containing layers, and determining the water-containing layers to be refilled
Setting the upward flow rate of the flow probe as a positive flow rate, and setting the downward flow rate of the flow probe as a negative flow rate according to the formula delta Qa = Qa-Qa-1, when delta Q is equal toaWhen the pressure is less than 0, the water in the aquifer of the a-th layer flows from the outside of the well pipe to the inside of the well pipe, and the pressure outside the well pipe in the aquifer of the a-th layer is larger than the pressure inside the well pipe; when is Δ QaWhen the pressure is more than 0, the pressure outside the well pipe in the aquifer of the a layer is smaller than the pressure inside the well pipe, and the aquifer of the recharge well is set to be the water-bearing stratum of the recharge well;
fourthly, determining the position of the recharging well
Calculating an influence radius according to the pumping test result of the water outlet geothermal well, wherein the distance from the construction position of the recharging well to the water outlet geothermal well is 1/2-2/3 of the influence radius;
fifthly, constructing a recharging well
When the recharging well is a perforation well-forming construction method, after the recharging well is constructed, the difference between the reservoir depth of the recharging well and the reservoir depth of the pumping well is checked through geophysical prospecting well logging, the water-bearing stratum is subjected to well cementation construction, and after the well is fixed, the recharging water-bearing stratum of the recharging well is perforated and washed; when the recharging well is a gravel filling well forming construction method, after the recharging well is constructed, the difference between the recharging well and the ground layer burying depth of a pumping well is checked through geophysical prospecting well logging, a water filter pipe is arranged below a recharging water-containing layer of the recharging well when the pipe is lowered, and gravel materials are refilled outside the water filter pipe; when the recharging well is a construction method for forming the same-diameter water-stopping well, after the recharging well is constructed, the difference between the constructed recharging well and the buried depth of the pumping well is checked through geophysical prospecting well logging, a water filter pipe is arranged below a recharging aquifer of the recharging well during pipe descending, and the upper end and the lower end of the aquifer are sealed for water stopping.
As a further improvement of the construction method of the sandstone-type water-outlet geothermal well and the recharging well,
after the pressure of water outside each water-containing layer and the pressure in the pipe body are calculated in the third step, a recharge test is carried out, the recharge water-containing layer of the recharge well is verified again, and a new recharge water-containing layer is set, wherein the recharge test comprises the following steps:
after the water level in the water outlet geothermal well is stable, injecting water into the water outlet geothermal well to ensure that the water surface in the water outlet geothermal well is away from a certain constant water level between 0.5 and 2.5 meters, continuously injecting water into the water outlet geothermal well according to water level settlement to ensure that the liquid level in the water outlet geothermal well is at the constant water level, sequentially placing flow probes at corresponding positions in the water outlet geothermal well between every two adjacent water-containing layers, respectively recording the flow between every two adjacent water-containing layers in the water outlet geothermal well, and taking the flow above the first water-containing layer from the top as Q0The flow rate between the first aquifer and the second aquifer is Q1The flow rate between the second aquifer and the third aquifer is Q2… …, the flow rate between the n-1 st layer and the n-th aquifer being Qn-1，
Setting the upward flow rate of the flow probe as a positive flow rate, and setting the downward flow rate of the flow probe as a negative flow rate according to the formula delta Qa = Qa-Qa-1, when delta Q is equal toaWhen the pressure is less than 0, the water in the aquifer of the a-th layer flows from the outside of the well pipe to the inside of the well pipe, and the pressure outside the well pipe in the aquifer of the a-th layer is larger than the pressure inside the well pipe; when is Δ QaWhen the pressure is more than 0, the water in the aquifer of the a layer flows from the inside of the well pipe to the outside of the well pipe, the pressure outside the well pipe in the aquifer of the a layer is smaller than the pressure inside the well pipe, and the aquifer of the recharge well is set as a new recharge aquifer of the recharge well;
fourthly, determining the position of the recharging well
Calculating an influence radius according to the pumping test result of the water outlet geothermal well, wherein the distance from the construction position of the recharging well to the water outlet geothermal well is 1/2-2/3 of the influence radius;
fifthly, constructing a recharging well
When the recharging well is a perforation well-forming construction method, after the recharging well is constructed, the difference between the reservoir depth of the recharging well and the reservoir depth of the pumping well is checked through geophysical prospecting well logging, the well cementation construction is carried out on the aquifer, and after the well is fixed, the new recharging aquifer stratum of the recharging well is perforated and washed; when the recharging well is a gravel filling and well forming construction method, after the recharging well is constructed, the difference between the recharging well and the ground layer burying depth of a pumping well is checked through geophysical prospecting well logging, when the pipe is lowered, a water filtering pipe is lowered at the new recharging water-containing layer position of the recharging well, and gravel materials are backfilled outside the pipe; when the recharging well is a construction method for forming the same-diameter water-stopping well, after the recharging well is constructed, the difference between the constructed recharging well and the buried depth of the pumping well is checked through geophysical prospecting well logging, a water filtering pipe is arranged below a newly recharged aquifer of the recharging well during pipe descending, and the upper end of the aquifer is sealed for stopping water.
Compared with the prior art, the sandstone-type water-yielding geothermal well and recharge well construction method provided by the invention has the following advantages: firstly, the method comprises the following steps:
constructing a water outlet geothermal well according to regional stratum data, wherein the water outlet geothermal well utilizes a water-bearing stratum of all water-bearing groups of the heat storage section; after the water level in the water outlet geothermal well is stable, the flow probes are sequentially placed at the corresponding positions in the water outlet geothermal well between every two adjacent aquifers according to the regional stratum data and the water outlet geothermal well, the flow between every two adjacent aquifers in the water outlet geothermal well is recorded respectively, and the flow probes are counted from the top to the top of the water outlet geothermal well above the first aquiferFlow rate of Q0=0, and the flow rate between the first aquifer and the second aquifer is Q1The flow rate between the second aquifer and the third aquifer is Q2… …, the flow rate between the n-1 st layer and the n-th aquifer being Qn-1(ii) a Setting the upward flow rate of the flow probe as a positive flow rate, and setting the downward flow rate of the flow probe as a negative flow rate according to the formula delta Qa = Qa-Qa-1, when delta Q is equal toaWhen the pressure is less than 0, the water in the aquifer of the a-th layer flows from the outside of the well pipe to the inside of the well pipe, and the pressure outside the well pipe in the aquifer of the a-th layer is larger than the pressure inside the well pipe; when is Δ QaWhen the pressure is more than 0, the pressure outside the well pipe in the aquifer of the a layer is smaller than the pressure inside the well pipe, and the aquifer of the recharge well is set to be the water-bearing stratum of the recharge well; calculating an influence radius according to the pumping test result of the water outlet geothermal well, wherein the distance from the construction position of the recharging well to the water outlet geothermal well is 1/2-2/3 of the influence radius; when the recharging well is a perforation well-forming construction method, after the recharging well is constructed, the difference between the reservoir depth of the recharging well and the reservoir depth of the pumping well is checked through geophysical prospecting well logging, the water-bearing stratum is subjected to well cementation construction, and after the well is fixed, the recharging water-bearing stratum of the recharging well is perforated and washed; when the recharging well is a gravel filling well forming construction method, after the recharging well is constructed, the difference between the recharging well and the ground layer burying depth of a pumping well is checked through geophysical prospecting well logging, a water filter pipe is arranged below a recharging water-containing layer of the recharging well when the pipe is lowered, and gravel materials are refilled outside the water filter pipe; when the recharging well is the same-diameter water-stopping well-forming construction method, after the recharging well is constructed, the difference between the recharging well and the water pumping well in the stratum buried depth is checked through geophysical prospecting well logging, a water filtering pipe is arranged below a recharging aquifer of the recharging well during pipe descending, the upper end of the aquifer is sealed for water stopping,
the outlet geothermal well utilizes the aquifer of all the water-containing groups of the thermal storage section; the pressure in each aquifer in the water-containing group is measured through the water outlet geothermal well, when the recharge well is formed, the recharge layer of the recharge well is arranged in the aquifer with low underground water pressure and high water permeability coefficient, and blind pipes are adopted in other aquifers, so that water in the aquifer with high pressure cannot flow into the aquifer with low pressure and high water permeability coefficient through the recharge well, the water recharged through the recharge well quickly enters the aquifer where the recharge layer is located, the recharge speed is high, the recharge quantity is large, and the recharge efficiency is high; the distance from the recharge well to the water outlet geothermal well is 2/3 of the influence radius of the water outlet geothermal well, so that the recharge quantity is ensured, and the groundwater recharge heat breakthrough can be prevented;
secondly, after the pressure of water outside each water-containing layer and the pressure in the pipe body are calculated in the third step, a recharge test is carried out, the recharge water-containing layer of the recharge well is verified again, and a new recharge water-containing layer is set, wherein the recharge test comprises the following steps: after the water level in the water outlet geothermal well is stable, injecting water into the water outlet geothermal well to ensure that the water surface in the water outlet geothermal well is away from a certain constant water level between 0.5 and 2.5 meters, continuously injecting water into the water outlet geothermal well according to water level settlement to ensure that the liquid level in the water outlet geothermal well is at the constant water level, sequentially placing flow probes at corresponding positions in the water outlet geothermal well between every two adjacent water-containing layers, respectively recording the flow between every two adjacent water-containing layers in the water outlet geothermal well, and taking the flow above the first water-containing layer from the top as Q0The flow rate between the first aquifer and the second aquifer is Q1The flow rate between the second aquifer and the third aquifer is Q2… …, the flow rate between the n-1 st layer and the n-th aquifer being Qn-1(ii) a Setting the upward flow rate of the flow probe as a positive flow rate, and setting the downward flow rate of the flow probe as a negative flow rate according to the formula delta Qa = Qa-Qa-1, when delta Q is equal toaWhen the pressure is less than 0, the water in the aquifer of the a-th layer flows from the outside of the well pipe to the inside of the well pipe, and the pressure outside the well pipe in the aquifer of the a-th layer is larger than the pressure inside the well pipe; when is Δ QaWhen the pressure is more than 0, the water in the aquifer of the a layer flows from the inside of the well pipe to the outside of the well pipe, the pressure outside the well pipe in the aquifer of the a layer is smaller than the pressure inside the well pipe, and the aquifer of the recharge well is set as a new recharge aquifer of the recharge well; calculating an influence radius according to the pumping test result of the water outlet geothermal well, wherein the distance from the construction position of the recharging well to the water outlet geothermal well is 1/2-2/3 of the influence radius; when the recharging well is a perforation well-forming construction method, after the recharging well is constructed, the difference between the reservoir depth of the recharging well and the reservoir depth of the pumping well is checked through geophysical prospecting well logging, the well cementation construction is carried out on the aquifer, and after the well is fixed, the new recharging aquifer stratum of the recharging well is perforated and washed; go back toWhen the recharging well is a gravel-filling well-forming construction method, after the recharging well is constructed, the difference between the recharging well and the stratum buried depth of the pumping well is checked through geophysical prospecting well logging, a water filter pipe is arranged at the new recharging water-containing layer of the recharging well when the pipe is arranged, and gravel materials are refilled outside the pipe; when the recharging well is a construction method for forming the same-diameter water-stopping well, after the recharging well is constructed, the difference of the buried depth of the recharging well and the buried depth of a pumping well stratum is checked through geophysical prospecting well logging, a water filtering pipe is arranged below a new recharging aquifer of the recharging well during pipe descending, water stopping is conducted in a sealing mode at the upper end of the aquifer, the new recharging aquifer under the recharging condition is further set through a certain constant water level of the recharging liquid level between 0.5 and 2.5 meters, and then the recharging aquifer of the recharging well is set according to the new recharging aquifer, so that the recharging effect is better.
Drawings
FIG. 1 is a schematic structural view of a sandstone-type effluent geothermal well according to the present invention;
FIG. 2 is a distribution plot of a flood geothermal well and a recharge well;
FIG. 3 is a schematic diagram of a perforated well recharge well;
FIG. 4 is a schematic structural view of a gravel pack completion recharge well;
FIG. 5 is a schematic structural diagram of a water-stopping well recharge well with the same diameter.
Detailed Description
The structure and the use principle of the construction method of the sandstone-type water-yielding geothermal well and the recharging well are further described in detail with reference to the attached drawings and the specific implementation mode.
FIG. 1 is a schematic structural diagram of a sandstone-type water-yielding geothermal well according to the present invention; the sandstone-type water outlet geothermal well 1 comprises a well hole 2 and a well pipe 3, wherein the well pipe 3 comprises a water inlet hole section 4 and a dead pipe section 5, a water inlet hole 6 is arranged on the water inlet hole section 4, and the water inlet hole section 4 corresponds to a water-bearing stratum 7.
As shown in FIG. 2, the distribution diagram of the water outlet geothermal well and the recharging well is that the influence radius r is calculated according to the pumping test result of the water outlet geothermal well 4, and the distance r1 between the construction position of the recharging well 8 and the water outlet geothermal well is 1/2-2/3 of the influence radius.
FIG. 3 is a schematic diagram of a structure of a perforated recharging well; the recharging well 8 comprises a well hole 9 and a well pipe 10, the well pipe 10 comprises a water inlet hole section 11 and a dead pipe section 12, a water inlet hole 13 is formed in the perforating section 11, and the water inlet hole section 11 corresponds to the recharging aquifer 7 with low pressure.
FIG. 4 is a schematic view of a gravel-packed well recharge well; the recharging well 8 comprises a well hole 9 and a well pipe 10, the well pipe 10 comprises a water inlet hole section 11 and a dead pipe section 12, a water inlet hole 13 is formed in the water inlet hole section 11, and the water inlet hole section 11 corresponds to the recharging aquifer 7 with small pressure.
As shown in fig. 5, it is a schematic structural diagram of a water-stopping well-completion recharging well with the same diameter; the recharging well 8 comprises a well hole 9 and a well pipe 10, the well pipe 10 comprises a water inlet hole section 11 and a dead pipe section 12, a water inlet hole 13 is formed in the water inlet hole section 11, and the water inlet hole section 11 corresponds to the recharging aquifer 7 with small pressure.
The sand rock type water outlet geothermal well and recharging well construction method comprises the following steps:
first, geothermal well construction
Constructing a water outlet geothermal well 1 according to regional stratum data, wherein the water outlet geothermal well 1 utilizes a water-bearing stratum of all water-bearing groups of a heat storage section;
secondly, measuring the water flow between each adjacent aquifer in the aquifer by using the flow probe and recording the water flow between each adjacent aquifer
After the water level in the water outlet geothermal well 1 is stable, according to regional stratum data and the water outlet geothermal well, the flow probes are sequentially placed at the corresponding positions in the water outlet geothermal well between every two adjacent aquifers, the flow between every two adjacent aquifers in the water outlet geothermal well is recorded respectively, and the flow above the first aquifer counted from the top is Q0=0, and the flow rate between the first aquifer and the second aquifer is Q1The flow rate between the second aquifer and the third aquifer is Q2… …, the flow rate between the n-1 st layer and the n-th aquifer being Qn-1，
Thirdly, calculating the pressure of water outside each water-containing layer and the pressure in the pipe body according to the flow between the adjacent water-containing layers 7, and determining the recharge water-containing layers
Setting the upward flow rate of the flow probe as positive flow rate, and setting the downward flow rate of the flow probe as negative flow rateThe number flow rate is according to the formula delta Qa = Qa-1, when delta QaWhen the pressure is less than 0, the water in the aquifer of the a-th layer flows from the outside of the well pipe to the inside of the well pipe, and the pressure outside the well pipe in the aquifer of the a-th layer is larger than the pressure inside the well pipe; when is Δ QaWhen the pressure is more than 0, the pressure outside the well pipe in the aquifer of the a layer is smaller than the pressure inside the well pipe, and the aquifer of the recharge well is set to be the water-bearing stratum of the recharge well;
fourthly, determining the position of the recharging well
Calculating an influence radius r according to the pumping test result of the water outlet geothermal well, wherein the distance r1 from the construction position of the recharging well to the water outlet geothermal well is 1/2-2/3 of the influence radius;
fifthly, constructing a recharging well
When the recharging well is a perforation well-forming construction method, after the recharging well is constructed, the difference between the reservoir depth of the recharging well and the reservoir depth of the pumping well is checked through geophysical prospecting well logging, the water-bearing stratum is subjected to well cementation construction, and after the well is fixed, the recharging water-bearing stratum of the recharging well is perforated and washed; when the recharging well is a gravel filling well forming construction method, after the recharging well is constructed, the difference between the recharging well and the ground layer burying depth of a pumping well is checked through geophysical prospecting well logging, a water filter pipe is arranged below a recharging water-containing layer of the recharging well when the pipe is lowered, and gravel materials are refilled outside the water filter pipe; when the recharging well is a construction method for forming the same-diameter water-stopping well, after the recharging well is constructed, the difference between the recharging well and the water pumping well in the stratum buried depth is checked through geophysical prospecting well logging, a water filtering pipe is arranged below a recharging aquifer of the recharging well during pipe descending, and the water stopping is carried out at the upper end of the aquifer in a sealing mode.
The outlet geothermal well utilizes the aquifer of all the water-containing groups of the thermal storage section; the pressure in each aquifer in the water-containing group is measured through the water outlet geothermal well, when the recharge well is formed, the recharge layer of the recharge well is arranged in the aquifer with low underground water pressure and high water permeability coefficient, and blind pipes are adopted in other aquifers, so that water in the aquifer with high pressure cannot flow into the aquifer with low pressure and high water permeability coefficient through the recharge well, the water recharged through the recharge well quickly enters the aquifer where the recharge layer is located, the recharge speed is high, the recharge quantity is large, and the recharge efficiency is high; the distance from the recharge well to the water outlet geothermal well is 2/3 of the influence radius of the water outlet geothermal well, so that the recharge quantity is ensured, and the groundwater recharge heat breakthrough can be prevented.
As a further improvement of the method, the method comprises the steps of:
first, geothermal well construction
Constructing a water outlet geothermal well 1 according to regional stratum data, wherein the water outlet geothermal well 1 utilizes a water-bearing stratum of all water-bearing groups of a heat storage section;
secondly, measuring the water flow between each adjacent aquifer in the aquifer by using the flow probe and recording the water flow between each adjacent aquifer
After the water level in the water outlet geothermal well 1 is stable, according to regional stratum data and the water outlet geothermal well, the flow probes are sequentially placed at the corresponding positions in the water outlet geothermal well between every two adjacent aquifers, the flow between every two adjacent aquifers in the water outlet geothermal well is recorded respectively, and the flow above the first aquifer counted from the top is Q0=0, and the flow rate between the first aquifer and the second aquifer is Q1The flow rate between the second aquifer and the third aquifer is Q2… …, the flow rate between the n-1 st layer and the n-th aquifer being Qn-1，
Thirdly, calculating the pressure of water outside each water-containing layer and the pressure in the pipe body according to the flow between the adjacent water-containing layers 7, and determining the recharge water-containing layers
Setting the upward flow rate of the flow probe as a positive flow rate, and setting the downward flow rate of the flow probe as a negative flow rate according to the formula delta Qa = Qa-Qa-1, when delta Q is equal toaWhen the pressure is less than 0, the water in the aquifer of the a-th layer flows from the outside of the well pipe to the inside of the well pipe, and the pressure outside the well pipe in the aquifer of the a-th layer is larger than the pressure inside the well pipe; when is Δ QaWhen the pressure is more than 0, the pressure outside the well pipe in the aquifer of the a layer is smaller than the pressure inside the well pipe, and the aquifer of the recharge well is set to be the water-bearing stratum of the recharge well;
and (3) carrying out a recharge test, verifying the recharge aquifer of the recharge well again, and setting a new recharge aquifer, wherein the recharge test comprises the following steps:
after the water level in the water outlet geothermal well is stable, injecting water into the water outlet geothermal well to ensure that the water surface in the water outlet geothermal well is away from a certain constant water level between 0.5 and 2.5 meters, continuously injecting water into the water outlet geothermal well according to water level settlement to ensure that the liquid level in the water outlet geothermal well is at the constant water level, sequentially placing flow probes at corresponding positions in the water outlet geothermal well between every two adjacent water-containing layers, respectively recording the flow between every two adjacent water-containing layers in the water outlet geothermal well, and taking the flow above the first water-containing layer from the top as Q0The flow rate between the first aquifer and the second aquifer is Q1The flow rate between the second aquifer and the third aquifer is Q2… …, the flow rate between the n-1 st layer and the n-th aquifer being Qn-1，
Setting the upward flow rate of the flow probe as a positive flow rate, and setting the downward flow rate of the flow probe as a negative flow rate according to the formula delta Qa = Qa-Qa-1, when delta Q is equal toaWhen the pressure is less than 0, the water in the aquifer of the a-th layer flows from the outside of the well pipe to the inside of the well pipe, and the pressure outside the well pipe in the aquifer of the a-th layer is larger than the pressure inside the well pipe; when is Δ QaWhen the pressure is more than 0, the water in the aquifer of the a layer flows from the inside of the well pipe to the outside of the well pipe, the pressure outside the well pipe in the aquifer of the a layer is smaller than the pressure inside the well pipe, and the aquifer of the recharge well is set as a new recharge aquifer of the recharge well;
fourthly, determining the position of the recharging well
Calculating an influence radius according to the pumping test result of the water outlet geothermal well, wherein the distance from the construction position of the recharging well to the water outlet geothermal well is 1/2-2/3 of the influence radius;
fifthly, constructing a recharging well
When the recharging well is a perforation well-forming construction method, after the recharging well is constructed, the difference between the reservoir depth of the recharging well and the reservoir depth of the pumping well is checked through geophysical prospecting well logging, the well cementation construction is carried out on the aquifer, and after the well is fixed, the new recharging aquifer stratum of the recharging well is perforated and washed; when the recharging well is a gravel filling and well forming construction method, after the recharging well is constructed, the difference between the recharging well and the ground layer burying depth of a pumping well is checked through geophysical prospecting well logging, when the pipe is lowered, a water filtering pipe is lowered at the new recharging water-containing layer position of the recharging well, and gravel materials are backfilled outside the pipe; when the recharging well is a construction method for forming the same-diameter water-stopping well, after the recharging well is constructed, the difference between the constructed recharging well and the buried depth of the pumping well is checked through geophysical prospecting well logging, a water filtering pipe is arranged below a newly recharged aquifer of the recharging well during pipe descending, and the upper end of the aquifer is sealed for stopping water.
The new recharging aquifer under the recharging condition is further set through a certain constant water level of the recharging liquid level between 0.5 and 2.5 meters, and then the recharging aquifer of the recharging well is set according to the new recharging aquifer, so that the recharging effect is better.
In the case where a geothermal well for water is already present, it is sufficient to start with the second step.
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 method is the same or similar to the structure of the construction method of the sandstone-type yielding geothermal well and the recharge well of the present invention.
Claims (2)
1. The sand rock type water outlet geothermal well and recharging well construction method is characterized by comprising the following steps of: the method comprises the following steps:
first, geothermal well construction
Constructing a water outlet geothermal well according to regional stratum data, wherein the water outlet geothermal well utilizes a water-bearing stratum of all water-bearing groups of the heat storage section;
secondly, measuring the water flow between each adjacent aquifer in the aquifer by using the flow probe and recording the water flow between each adjacent aquifer
After the water level in the water outlet geothermal well is stable, the flow probes are sequentially placed at the corresponding positions in the water outlet geothermal well between every two adjacent aquifers according to the regional stratum data and the water outlet geothermal well, and all phases in the water outlet geothermal well are recorded respectivelyThe flow rate between adjacent aquifers is Q above the first aquifer from above0=0, and the flow rate between the first aquifer and the second aquifer is Q1The flow rate between the second aquifer and the third aquifer is Q2… …, the flow rate between the n-1 st layer and the n-th aquifer being Qn-1，
Thirdly, calculating the pressure of water outside each water-containing layer and the pressure in the pipe body according to the flow between every two adjacent water-containing layers, and determining the water-containing layers to be refilled
Setting the upward flow rate of the flow probe as a positive flow rate, and setting the downward flow rate of the flow probe as a negative flow rate according to the formula delta Qa = Qa-Qa-1, when delta Q is equal toaWhen the pressure is less than 0, the water in the aquifer of the a-th layer flows from the outside of the well pipe to the inside of the well pipe, and the pressure outside the well pipe in the aquifer of the a-th layer is larger than the pressure inside the well pipe; when is Δ QaWhen the pressure is more than 0, the pressure outside the well pipe in the aquifer of the a layer is smaller than the pressure inside the well pipe, and the aquifer of the recharge well is set to be the water-bearing stratum of the recharge well;
fourthly, determining the position of the recharging well
Calculating an influence radius according to the pumping test result of the water outlet geothermal well, wherein the distance from the construction position of the recharging well to the water outlet geothermal well is 1/2-2/3 of the influence radius;
fifthly, constructing a recharging well
When the recharging well is a perforation well-forming construction method, after the recharging well is constructed, the difference between the reservoir depth of the recharging well and the reservoir depth of the pumping well is checked through geophysical prospecting well logging, the water-bearing stratum is subjected to well cementation construction, and after the well is fixed, the recharging water-bearing stratum of the recharging well is perforated and washed; when the recharging well is a gravel filling well forming construction method, after the recharging well is constructed, the difference between the recharging well and the ground layer burying depth of a pumping well is checked through geophysical prospecting well logging, a water filter pipe is arranged below a recharging water-containing layer of the recharging well when the pipe is lowered, and gravel materials are refilled outside the water filter pipe; when the recharging well is a construction method for forming the same-diameter water-stopping well, after the recharging well is constructed, the difference between the constructed recharging well and the buried depth of the pumping well is checked through geophysical prospecting well logging, a water filter pipe is arranged below a recharging aquifer of the recharging well during pipe descending, and the upper end and the lower end of the aquifer are sealed for water stopping.
2. The sandstone-type water-yielding geothermal well and recharge well construction method according to claim 1, wherein:
after the pressure of water outside each water-containing layer and the pressure in the pipe body are calculated in the third step, a recharge test is carried out, the recharge water-containing layer of the recharge well is verified again, and a new recharge water-containing layer is set, wherein the recharge test comprises the following steps:
step 1, measuring the water flow between each two adjacent aquifers in the aquifer by using a flow probe, recording the water flow between each two adjacent aquifers,
after the water level in the water outlet geothermal well is stable, injecting water into the water outlet geothermal well to ensure that the water surface in the water outlet geothermal well is away from a certain constant water level between 0.5 and 2.5 meters, continuously injecting water into the water outlet geothermal well according to water level settlement to ensure that the liquid level in the water outlet geothermal well is at the constant water level, sequentially placing flow probes at corresponding positions in the water outlet geothermal well between every two adjacent water-containing layers, respectively recording the flow between every two adjacent water-containing layers in the water outlet geothermal well, and taking the flow above the first water-containing layer from the top as Q0The flow rate between the first aquifer and the second aquifer is Q1The flow rate between the second aquifer and the third aquifer is Q2… …, the flow rate between the n-1 st layer and the n-th aquifer being Qn-1，
Step 2, calculating the pressure of water outside each water-containing layer and the pressure in the pipe body according to the flow between each two adjacent water-containing layers, and determining the water-containing layers to be refilled
Setting the upward flow rate of the flow probe as a positive flow rate, and setting the downward flow rate of the flow probe as a negative flow rate according to the formula delta Qa = Qa-Qa-1, when delta Q is equal toaWhen the pressure is less than 0, the water in the aquifer of the a-th layer flows from the outside of the well pipe to the inside of the well pipe, and the pressure outside the well pipe in the aquifer of the a-th layer is larger than the pressure inside the well pipe; when is Δ QaWhen the pressure is more than 0, the pressure outside the well pipe in the aquifer of the a-th layer is less than the pressure inside the well pipe, and the aquifer from which water flows outside the well pipe in the well pipe is set to beAnd (5) recharging the new recharging aquifer of the recharging well.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110306060.6A CN113153223B (en) | 2021-03-23 | 2021-03-23 | Sandstone-type water outlet geothermal well and recharge well construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110306060.6A CN113153223B (en) | 2021-03-23 | 2021-03-23 | Sandstone-type water outlet geothermal well and recharge well construction method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113153223A CN113153223A (en) | 2021-07-23 |
| CN113153223B true CN113153223B (en) | 2022-03-22 |
Family
ID=76888027
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110306060.6A Active CN113153223B (en) | 2021-03-23 | 2021-03-23 | Sandstone-type water outlet geothermal well and recharge well construction method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113153223B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113686034B (en) * | 2021-08-30 | 2024-06-21 | 中能建地热有限公司 | Operation method of medium-low temperature geothermal well utilization system for composite aquifer |
| CN114017935B (en) * | 2021-09-16 | 2023-04-14 | 西安交通大学 | A method for determining the spacing between reinjection wells and pumping wells based on a dual-porosity and dual-permeability model |
| CN114658395B (en) * | 2022-04-14 | 2024-02-23 | 河北省地质矿产勘查开发局第三水文工程地质大队(河北省地热资源开发研究所) | Method for improving recharge quantity of sandstone heat Chu Dere well |
| CN114856699A (en) * | 2022-04-21 | 2022-08-05 | 中国冶金地质总局第一地质勘查院 | Method for recharging mine water deep well |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1936440A (en) * | 2006-03-24 | 2007-03-28 | 钟显亮 | Super-energy-saving comfortible health-care type local air-conditioner |
| US9127897B2 (en) * | 2010-12-30 | 2015-09-08 | Kellogg Brown & Root Llc | Submersed heat exchanger |
| CN203833742U (en) * | 2014-05-21 | 2014-09-17 | 天津地热勘查开发设计院 | Water treatment device in surface water recharge system |
| CN107606682A (en) * | 2017-09-18 | 2018-01-19 | 河北华威新能源科技有限公司 | The very bi-directional filtered geothermal utilization heating system of recharge |
| CN108266912A (en) * | 2018-03-27 | 2018-07-10 | 遵化市华通热力有限公司 | A kind of recharge system and recharge method using shallow layer geothermal energy |
| CN209764160U (en) * | 2019-05-07 | 2019-12-10 | 河北省地矿局第四水文工程地质大队 | Movable type recharging equipment with automatic monitoring system |
| CN210688797U (en) * | 2019-10-31 | 2020-06-05 | 中核坤华能源发展有限公司 | Geothermal recharge system |
| CN112413914B (en) * | 2020-11-25 | 2022-03-01 | 河北绿源地热能开发有限公司 | Negative-pressure-free geothermal recharging system and recharging method |
-
2021
- 2021-03-23 CN CN202110306060.6A patent/CN113153223B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN113153223A (en) | 2021-07-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113153223B (en) | Sandstone-type water outlet geothermal well and recharge well construction method | |
| CN111191849B (en) | Method for predicting water inflow of deep-buried working face in western mining area | |
| CN110425003B (en) | Mining method for improving recovery ratio of coal bed gas in coal bed gas development vertical well and directional well group | |
| CN201037819Y (en) | Experimental device for loose confined aquifer load transmission action | |
| CN103090571B (en) | Method of circular mining geothermal resources | |
| CN104569352B (en) | The determination method of ash packwall, top difficult to understand structure discrimination index | |
| CN106522928B (en) | Well testing method for unstable pressure drop of well logging head by stopping pump after acidizing and fracturing | |
| CN104847379B (en) | A method for strengthening the bottom plate of working face by grouting at the top of Austrian ash | |
| CN108316924A (en) | A kind of water protection mining mine/mining area rank division method | |
| Andersson | Aquifer thermal energy storage (ATES) | |
| CN114876572A (en) | Underground gas storage and its site selection and reconstruction method | |
| CN116432546A (en) | A coupling simulation method and system for uranium production by horizontal well pattern in-situ leaching and well-storage | |
| CN102587345A (en) | Multi-wave stacking intermittent recharge construction method based on water level control | |
| CN113586148A (en) | Method for determining water storage coefficient of underground reservoir of open pit coal mine | |
| CN111119992B (en) | Method for determining drilling parameters of drainage water of coal seam roof | |
| CN105386430B (en) | A kind of lower water-stop curtain both sides water level method for determining difference of water-stop curtain effect | |
| CN217055130U (en) | Pressure-bearing artesian well drainage test device | |
| CN207093043U (en) | Tubing string is adopted in a kind of coal bed gas and compact sandstone gas underground altogether | |
| Zhang et al. | Numerical evaluation of land subsidence induced by dewatering in deep foundation pit | |
| CN213209012U (en) | Ground settlement monitoring layering mark and water level monitoring well | |
| CN114483188A (en) | A method for disposal of high salinity mine water by reinjection of depleted oil layer | |
| CN111046586B (en) | Prediction method for ground settlement caused by exploiting deep unconsolidated formation geothermal heat | |
| CN210714650U (en) | A device for increasing heat exchange area in shallow geothermal energy | |
| CN102680028B (en) | Method for calculating water discharge amount and water discharge time during dynamic water fall process in submersible partially penetrating well or well group | |
| CN105298455B (en) | A kind of adjacent ancient stream channel development morning and evening evaluation method in underground |
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 | ||
| CB03 | Change of inventor or designer information | ||
| CB03 | Change of inventor or designer information |
Inventor after: Qi Gong Inventor after: Zhao Fanghua Inventor after: Feng Yang Inventor after: Zhao Linru Inventor after: Yang Tingting Inventor after: Li Yang Inventor after: Li Jun Inventor after: Jing Long Inventor after: Song Qian Inventor after: Li Zigao Inventor after: Zhang Cheng Inventor after: Xing Xiaochen Inventor after: Qi Xiaofeng Inventor before: Qi Gong Inventor before: Zhao Fanghua Inventor before: Feng Yang Inventor before: Zhao Linru Inventor before: Yang Tingting Inventor before: Li Yang Inventor before: Li Jun Inventor before: Jing Long Inventor before: Song Qian Inventor before: Li Zigao Inventor before: Zhang Cheng Inventor before: Xing Xiaochen Inventor before: Qi Xiaofeng |
|
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 053000 no.808, Hongqi Street, Hengshui City, Hebei Province Patentee after: The third hydrogeological engineering geology brigade of Hebei Bureau of Geology and mineral exploration and development (Hebei Institute of geothermal resources development) Patentee after: Qi Gong Address before: 053000 no.808, Hongqi Street, Hengshui City, Hebei Province Patentee before: HEBEI BUREAU OF GEOLOGY AND MINERAL NO. 3 HYDROLOGICAL ENGINEERING GEOLOGICAL TEAM Patentee before: Qi Gong |