CN111798078A - Hydrothermal type geothermal dynamic recoverable resource amount evaluation method and system - Google Patents
Hydrothermal type geothermal dynamic recoverable resource amount evaluation method and system Download PDFInfo
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Abstract
The invention discloses a hydrothermal geothermal dynamic recoverable resource amount evaluation method, which comprises the following steps: determining the reasonable production flow of a production well of a target heat storage layer system of the area to be evaluated; determining the well spacing at which the production wells do not generate thermal breakthrough within the heat recovery period by utilizing the reasonable production flow of the production wells; calculating the influence area of the cold water recharging in the heat recovery time by using the well spacing without heat breakthrough of the production well; determining the number of reasonable well groups of the target heat storage layer system in the area to be evaluated based on the influence area of the cold water recharging in the heat collecting time; and evaluating the dynamic recoverable resource amount of the well groups and the areas in the heat recovery time by using the reasonable production flow and the reasonable well group quantity of the production wells. The geothermal recoverable resource evaluation method has the advantages of accurate and reliable prediction result, strong operability, convenience and rapidness, and is particularly suitable for the early-stage feasibility evaluation stage of regional geothermal dynamic recoverable resource planning and utilization and geothermal heating projects.
Description
Technical Field
The invention relates to the field of geological exploration of geothermal blocks, in particular to a hydrothermal geothermal dynamic recoverable resource amount evaluation method and system.
Background
With the development of the geothermal industry and the improvement of the environmental protection requirement, the geothermal water recharging process of 'taking heat but not taking water' becomes an indispensable link in the design of the existing geothermal heating project, so that important evaluation needs to be carried out on the recoverable resource amount of the target heat storage layer system based on the recharging working condition in the early-stage feasibility evaluation report of the geothermal project.
In the existing geothermal industry standard, the geothermal recoverable resource evaluation usually adopts an empirical coefficient method, and the method cannot meet the requirements of project evaluation due to large heat storage property difference. The geothermal recoverable resource evaluation based on the development scheme usually adopts a numerical simulation method to establish a target heat storage geological model or a conceptual model, and obtains the geothermal dynamic recoverable resource amount based on the target development scheme by solving a mathematical model through numerical values, but the numerical modeling and history fitting process is time-consuming and labor-consuming. Aiming at the industrial current situation that geological exploration data of a geothermal block is less and is not enough to build a geological model with abundant geological information, the equivalent conceptual model is a physical model commonly used for numerical simulation. Therefore, in order to solve the current market situation that geothermal recharging tends to be standardized and the rapidly developing geothermal industry, a project development stage needs a rapid evaluation method of geothermal recoverable resources based on a heat storage conceptual model.
Disclosure of Invention
One of the technical problems to be solved by the invention is to provide an evaluation method for hydrothermal geothermal dynamic recoverable resource amount, and to form an evaluation process capable of meeting the technical requirements of rapid and accurate evaluation. The method overcomes the defects that the prior empirical coefficient method for calculating the geothermal recoverable resource amount is too simplified, the modeling of a numerical simulation method is complex and time-consuming, and the like, and realizes the breakthrough of the high-efficiency evaluation of the hydrothermal geothermal dynamic recoverable resource under the recharge condition.
In order to solve the above technical problem, an embodiment of the present application first provides a method for evaluating a hydrothermal geothermal dynamic recoverable resource amount, the method comprising: determining the reasonable production flow of a production well of a target heat storage layer system of an area to be evaluated; secondly, determining the well spacing at which the production wells do not generate thermal breakthrough within the heat recovery period by utilizing the reasonable production flow of the production wells; thirdly, calculating the influence area of the cold water reinjection in the heat recovery time by using the well spacing without heat breakthrough of the production well; determining the reasonable well group number of the target heat storage layer system in the area to be evaluated based on the influence area of the cold water recharging in the heat collecting time; and fifthly, evaluating the dynamic recoverable resource amount of the well groups and the areas in the heat recovery time by utilizing the reasonable production flow and the reasonable well group quantity of the production wells.
According to an embodiment of the present invention, further comprising: and step six, predicting the heating area of the well group and the area by using the reasonable production flow and the reasonable well group quantity of the production wells.
According to an embodiment of the present invention, in the step six, the method includes: determining the heat production power of the well groups and the areas by using the reasonable production flow and the reasonable well group quantity of the production wells; and calculating the heating area of the well group and the area based on the heating power of the well group and the area according to the heating power of the unit area corresponding to the heating and radiating mode of the user side.
According to an embodiment of the present invention, in the step one, the method includes: collecting the once-developed water pumping test result of the target heat storage layer of the area to be evaluated; judging the relation between the water yield of the single well and the depth reduction by adopting a curvature method according to the water pumping test result; and calculating the water yield of the single well under the reasonable depth reduction condition by utilizing the determined relation between the water yield of the single well and the depth reduction, and taking the water yield of the single well as the reasonable production flow of the production well.
According to an embodiment of the present invention, in the second step, the method includes: obtaining the migration distance of the cold fluid by using the average speed and the migration time of the cold fluid in the recharge well after entering the reservoir; and taking the distance of the cold fluid migration as the well spacing at which the production well does not generate heat breakthrough within the heat recovery period.
According to one embodiment of the invention, in a production-interval-filling-well-group development mode, the minimum well spacing of a production-interval-filling-well group in which thermal breakthrough of the production wells does not occur within the thermal production time is estimated using the following formula:
D＝Rp
wherein D is the distance between the production well and the recharge well, m is RpThe radius of flow of the recharge well in the heat recovery time is m; m is the reasonable production flow of the production well, M3S; h is the average heat storage thickness m; t is the heat recovery time of the well group, s; r iswTo recharge the wellbore radius, r is the cold water flow radius.
According to an embodiment of the invention, in the third step, the radius of the cold front of the recharging well is calculated by using the well spacing where no thermal breakthrough occurs in the production well; calculating the radius of the hot front edge of the recharging well by utilizing the radius of the cold front surface of the recharging well and the reasonable production flow of the production well; and calculating the influence area of the cold water recharging in the heat extraction time based on the radius of the thermal front and the well interval of the production well without thermal breakthrough.
According to one embodiment of the invention, the radius of the thermal front of the recharging cold well is obtained by theoretical analytical calculation of a heat storage fluid energy conservation equation under the condition of local thermal equilibrium; the energy conservation equation is derived based on the assumption that the confined aquifer heat reservoir is homogeneous, isotropic, of equal thickness, and of equal initial pressure everywhere, and neglects the heat exchange between the heat reservoir and the upper and lower strata.
According to an embodiment of the invention, in the fifth step, the recoverable resource amount of the geothermal heat extracted from the target heat storage layer by the single well group is determined according to the temperature of the production well, the recharging temperature and the reasonable production flow rate of the production well; and determining the recoverable resource amount of the geothermal heat extracted from the target heat storage layer system in the area to be evaluated based on the recoverable resource amount of the geothermal heat extracted from the target heat storage layer system by the single well group and the reasonable well group number.
According to another aspect of the invention, there is also provided a system for evaluating the amount of geothermal dynamic recoverable resources of the hydrothermal type, the system performing the evaluation method as defined in any one of the preceding claims.
Compared with the prior art, one or more embodiments in the above scheme can have the following advantages or beneficial effects:
the embodiment of the invention discloses a hydrothermal geothermal dynamic recoverable resource rapid evaluation method, relates to the field of geothermal resource evaluation, aims to realize rapid and accurate evaluation of target thermal storage dynamic recoverable resource amount under a recharge condition, and establishes a rapid evaluation method and a rapid evaluation flow of thermal dynamic recoverable resource and heating potential under a one-mining-one-recharging well group development mode based on a theoretical approximate solution of a thermal storage seepage heat transfer mathematical model. Firstly, determining a basic exploitation scheme of a reasonable production flow of a production well and a well interval without thermal breakthrough in heat exploitation time, then determining the influence area of well groups and the number of reasonable well groups in a heat exploitation time limit, and further evaluating the recoverable resource amount and the heating potential of the well groups and the region. The geothermal recoverable resource evaluation method has the advantages of accurate and reliable prediction result, strong operability, convenience and rapidness, and is particularly suitable for the early-stage feasibility evaluation stage of regional geothermal dynamic recoverable resource planning and utilization and geothermal heating projects.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure and/or process particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the technology or prior art of the present application and are incorporated in and constitute a part of this specification. The drawings expressing the embodiments of the present application are used for explaining the technical solutions of the present application, and should not be construed as limiting the technical solutions of the present application.
Fig. 1 is a schematic diagram of a geothermal well group for one-producing-one-irrigation in accordance with an embodiment of the present application.
Fig. 2 is a schematic diagram of well group temperature distribution and well group influence area in heat recovery time according to the embodiment of the present application.
FIG. 3 is a schematic flow chart illustrating a method for evaluating the geothermal dynamic recoverable resource amount of a hydrothermal system according to an embodiment of the present application.
Fig. 4 is a schematic structural diagram of an evaluation system for hydrothermal geothermal dynamic recoverable resource amount according to an embodiment of the present application.
Detailed Description
The following detailed description of the embodiments of the present invention will be provided with reference to the accompanying drawings and examples, so that how to apply the technical means to solve the technical problems and achieve the corresponding technical effects can be fully understood and implemented. The embodiments and the features of the embodiments can be combined without conflict, and the technical solutions formed are all within the scope of the present invention.
Additionally, the steps illustrated in the flow charts of the figures may be performed in a computer system such as a set of computer-executable instructions. Also, while a logical order is shown in the flow diagrams, in some cases, the steps shown or described may be performed in an order different than here.
The embodiment of the invention provides a rapid evaluation method for hydrothermal geothermal dynamic recoverable resource amount, which is suitable for accurately calculating the recoverable resource amount and predicting heating potential in a geothermal project feasibility evaluation stage and solves the technical problems mentioned in the background technology. By establishing a theoretical estimation method of geothermal dynamic recoverable resources and a rapid prediction process of heating potential, a set of rapid evaluation technical scheme of geothermal dynamic recoverable resources with accurate prediction and convenient operation is formed, the evaluation period of geothermal projects can be shortened, the cost of manpower and material resources is reduced, meanwhile, the accurate and efficient decision of geothermal projects is facilitated, and the adaptability of enterprises to the rapid development and the intense competition of the domestic geothermal industries is improved.
In order to achieve the above purpose, the embodiments of the present invention perform rapid evaluation on geothermal dynamic recoverable resources in a one-mining-one-well-filling group development mode (as shown in fig. 1) commonly used in geothermal projects, and the method steps of the embodiments of the present invention are described below with reference to the accompanying drawings.
FIG. 3 is a schematic flow chart illustrating a method for evaluating the geothermal dynamic recoverable resource amount of a hydrothermal system according to an embodiment of the present application.
As shown in fig. 3, in step S310, a reasonable production flow rate of the production well of the target thermal reservoir system of the area to be evaluated is determined.
In the step, according to the once developed water pumping test result of the target heat storage layer system in the region, the water yield of the single well under the reasonable depth lowering condition is determined and is used as the reasonable production flow of the production well of the heat storage layer system. Specifically, collecting the once developed pumping test result of the target heat storage layer of the area to be evaluated, judging the relation between the water yield of the single well and the depth reduction by adopting a curvature method according to the pumping test result, and finally calculating the water yield of the single well under the reasonable depth reduction condition by utilizing the determined relation between the water yield of the single well and the depth reduction, wherein the water yield of the single well is used as the reasonable production flow of the production well.
In one example, the pumping test result of the geothermal well in the area to be evaluated is collected, the type of a relation curve between the water inflow amount (also called single well water yield) M and the depth S of the single well is judged by adopting a curvature method, and the technical requirement of the method meets the data sorting requirement of the GB/T11615-2010 pumping test. The judgment basis is as follows: when n is 1, the type of the M-S curve is linear; when 1< n <2, the M-S curve type is a power function curve; when n is 2, the type of the M-S curve is parabolic; when n >2, the M-S curve type is a logarithmic curve type. And (3) sorting the pumping test results according to curve types to obtain an M-S relation curve, such as a logarithmic curve relation shown in a formula (2), determining an unknown constant in the relation, and further determining the single-well water inflow under the water thickness of the target thermal reservoir system under the requirement of reasonable water level depth reduction in the area (namely, the single-well water inflow is calculated by using the formula (2)).
Wherein M is1And M2Respectively one geothermal well pumping test corresponding depth reduction S1And S2Water inflow per well under working condition of (unit: m) and single wellBit: m is3/d。
M＝a·lgS+b (2)
Wherein M represents the single-well water inflow under the water thickness of the target heat storage layer under the requirement of the reasonable water level drawdown S (for the reasonable water level drawdown, according to the technical requirement of GB/T11615-2010 geothermal resource geological survey specification, the maximum water level drawdown is generally not more than 20M); a. b represents a constant in the logarithmic curve relation.
Next, in step S320, the well interval at which the production well does not generate thermal breakthrough within the thermal life is determined by using the reasonable production flow rate of the production well.
Specifically, cold fluid in the recharging well enters a reservoir and is continuously transported until a production well is produced, and the distance R of the cold fluid transportation in a certain heat production timepI.e. the minimum well spacing D of a producing-filling well group in which the production wells do not experience a temperature drop (i.e. do not experience a thermal breakthrough) during the heat production time. The migration distance of the cold fluid in the reservoir is calculated from the average velocity and the migration time, as shown in the following formula (3).
Wherein D is the distance between the production well and the recharge well, m is RpThe radius of flow of the recharge well in the heat recovery time is m. M is the reasonable production flow of the reasonable depth reduction of the production well, M3S; h is the average heat storage thickness m; t is the heat recovery time of the well group, s; r iswTo recharge the wellbore radius, r is the cold water flow radius.
Next, in step S330, the influence area of the cold water recharging in the heat recovery time is calculated by using the well interval where the production well does not generate the heat breakthrough.
In the step, the radius of the cold front of the recharging well is calculated by using the well interval without thermal breakthrough of the production well, then the radius of the hot front of the recharging well is calculated by using the radius of the cold front of the recharging well and the reasonable production flow of the production well, and then the influence area of the recharging cold water in the heat production time is calculated based on the radius of the hot front and the well interval without thermal breakthrough of the production well.
In the heat recovery process, the reservoir around the recharging well is cooled due to the recharging of cold water, and the influence range of the well group is gradually expanded along with the movement of the cold front of the recharging well, as shown in figure 2. The area of influence of one-production-one-well-filling group in a certain heat production time is calculated as follows:
Adoublet＝LT,1·LT,2＝2R·(R+D) (4)
wherein R is the thermal front radius, m; d is the distance between the production well and the recharge well, m.
The radius of the thermal front edge of the back-filling cold fluid is obtained by theoretical analytic calculation of a heat storage fluid energy conservation equation under the condition of local thermal balance. The energy conservation control equation is expressed as follows based on the assumption that the confined aquifer heat storage is homogeneous, isotropic, equal in thickness and equal in initial pressure at each position and the heat exchange between the heat storage and the upper and lower strata is neglected to obtain the energy conservation equation:
in the formula, ρaca＝φρwcw+(1-φ)ρrcr，λa＝φλw+(1-φ)λrRho, c and lambda are densities (kg/m) respectively3) Specific heat capacity (J/kg/. degree. C.) and thermal conductivity (W/m/. degree. C.); phi is the heat storage porosity; subscript r represents rock and subscript w represents water.
Next, in step S340, the number of reasonable well groups of the target heat storage layer system in the area to be evaluated is determined based on the influence area of the cold water recharging in the heating time.
The number of well groups reasonably arranged in the target region is determined by the influence area of the well groups, and in order to ensure that mutual interference does not occur among the well groups, the reasonable number N of the well groups of the target heat storage layer system in the region is calculated by the following formula.
Wherein A istotalThe target layer is the heat storage area.
In step S350, the reasonable production flow and the reasonable well group quantity of the production wells are used for evaluating the dynamic recoverable resource quantity of the well groups and the areas in the heat recovery time.
Specifically, determining the recoverable resource amount of the geothermal heat extracted from the target heat storage layer by the single well group according to the temperature of the production well, the recharge temperature and the reasonable production flow of the production well; and determining the recoverable resource amount of the geothermal heat extracted from the target heat storage layer system in the area to be evaluated based on the recoverable resource amount of the geothermal heat extracted from the target heat storage layer system by the single well group and the reasonable well group number.
And in the continuous heat extraction time, the heat quantity extracted from the reservoir by the working medium under the recharging condition is determined by the temperature of the production well, the recharging temperature, the reasonable production flow of the production well and the like. The amounts of geothermal recoverable resources extractable from a certain thermal reservoir series for a single well group and a target region are calculated by equations (7) and (8), respectively. The sampling coefficient α is a ratio of the amount of the dynamic sampling resources to the amount of the static resources, and is calculated by equation (9).
Qtotal＝N·Qdoublet(8)
In the formula, Qdoublet、QtotalGeothermal recoverable resource quantities, J, for well groups and zones, respectively; Δ t is evaluation time, cwIs the specific heat capacity, T, of waterpro(T) Water temperature, T, of production wellinjFor recharging well water temp. and heat storage capacity C ═ rhorcr(1-φ)+ρwcwφ、ρrAnd ρwDensity of rock and water, crAnd cwSpecific heat capacity of rock and water, phi porosity, TrFor heat storage temperature, T0The temperature of the local constant temperature zone and the heat storage thickness H.
In addition, in the embodiment of the present invention, a step S360 may be further included, and in step S360, the well group and the district heatable area are predicted by using the reasonable production flow rate and the reasonable well group number of the production wells.
The prediction of the geothermal heating potential of the well group and the area based on the exploitation mode of the one-exploitation one-filling well group is determined by the heat exploitation power of the well group and the area, and the heat exploitation power P of the well group and the area is determined by utilizing the reasonable production flow and the reasonable number of the well groups of the production wellsdoubletAnd PtotalSee formulas (10) and (11). Heating power q per unit area corresponding to heating and radiating mode of user sideheatingCalculating the heatable area A of the well group and the zone based on the heat production power of the well group and the zoned,heatingAnd At,heatingCalculated from the following equation.
Pdoublet＝Mcp(Tpro-Tinj) (10)
Ptotal＝N·Pdoublet(11)
In the formula, Pdoublet、PtotalRespectively the heat recovery power, W, of the well group and the area; a. thed,heating、At,heatingHeatable area, m, of well groups and zones, respectively2；qheatingThe heating heat index, W/m, corresponding to the heat dissipation mode of the user terminal2。
For a better understanding of the present invention, the method of the present invention is further described below in conjunction with specific examples. Heat storage in a certain group of certain area (the heat storage temperature is 56.5 ℃, and the heat storage area is 411.62km2) The detailed operation steps of the evaluation method are performed according to the flow shown in fig. 3 as an evaluation object.
In step 310, a production well reasonable production flow rate is determined. Obtaining a relation curve of water inflow M-depth reduction S according to the existing geothermal well water pumping test result, and further obtaining the single-well water inflow of the target thermal reservoir water thickness under the requirement of the depth reduction of the water level of the region (20M), 2006.8M3/d。
In step 320, the well spacing at which no thermal breakthrough occurred within the heat recovery years is determined. The well spacing of a producing-filling well group in which no thermal breakthrough occurred within the thermal production period was estimated to be 600m using the following formula:
in step 330, the well group impact area within the heat recovery years is calculated. The heat storage layer series is mined by adopting a mining-filling geothermal well group, the influence range of the well group under the recharging condition is 620m multiplied by 910m by utilizing the following formula to calculate, and the control area of the well group is 0.5642km2
Adoublet＝LT,1·LT,2＝2R·(R+D)
In step 340, the number of allowable reasonable well groups in the target area is calculated, and the area of the target heat storage layer is 411.62km2And the influence area of the well group within the heat recovery period is 0.5642km2The number of reasonable groups of wells 729 that the zone can be allocated is calculated.
In step 350, the amount of well groups and zone dynamic recoverable resources within the heat recovery time is evaluated.
The geothermal project with the temperature of the thermal storage layer of 56.5 ℃ and the recharge temperature of 30 ℃ is operated and heated within the time range of 100 years, and the geothermal dynamic recoverable resource amount extracted from the target thermal storage layer by one-mining one-recharging well group and the region is respectively calculated by the following formula to be 0.266 multiplied by 1016J and 1.94X 1018J。
Qtotal＝N·Qdoublet
In step 360, the heatable areas of the group of wells and zones are predicted.
The thermal power production for the well groups and zones under recharge conditions based on a one-to-one recharge well group production pattern was 2.54MW and 1848.6 MW. If the heating mode of the user side is 40W/m for the floor radiation heating2The heatable area of the individual well group and the whole heat storage layer system is 6.34 x 104m2And 4621.4 × 104m2。
Pdoublet＝Mρwcw(Tpro-Tinj)
Ptotal＝N·Pdoublet
The embodiment of the invention provides a hydrothermal geothermal dynamic recoverable resource amount rapid evaluation method, which is applied to the field of hydrothermal geothermal resource evaluation, and is used for calculating the recoverable resource amount based on a one-mining one-filling well group development scheme commonly used in geothermal projects compared with the conventional empirical coefficient method.
In addition, aiming at the recoverable resource quantity evaluation of the confined aquifer heat storage with the advantages of homogeneity, isotropy, equal thickness and equal initial pressure at each position, the evaluation method has the same result with a numerical simulation method, and the evaluation method is based on the theoretical approximate solution of the seepage heat transfer process in the heat storage, so the field application is more convenient and efficient.
In another embodiment of the invention, a hydrothermal type system for evaluating the geothermal dynamic recoverable resource amount is further disclosed, and the specific composition structure of the system 40 is shown in fig. 4.
As shown in fig. 4, the system 40 includes: the system comprises a reasonable production flow determining module 41, a well spacing calculating module 43, an influence area calculating module 45, a reasonable well group number determining module 47, a recoverable resource amount evaluating module 48 and a heatable area predicting module 49. These modules respectively execute the steps S310 to S360 mentioned above, and therefore are not described in detail.
It is to be understood that the disclosed embodiments of the invention are not limited to the particular structures or process steps disclosed herein, but extend to equivalents thereof as would be understood by those skilled in the relevant art. It is also to be understood that the terminology used herein is for the purpose of describing particular embodiments only, and is not intended to be limiting.
Reference in the specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention. Thus, the appearances of the phrase "one embodiment" or "an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment.
While the above examples are illustrative of the principles of the present invention in one or more applications, it will be apparent to those of ordinary skill in the art that various changes in form, usage and details of implementation can be made without departing from the principles and concepts of the invention. Accordingly, the invention is defined by the appended claims.
Claims (10)
1. A hydrothermal method for evaluating the amount of geothermal dynamic recoverable resources, comprising:
determining the reasonable production flow of a production well of a target heat storage layer system of an area to be evaluated;
secondly, determining the well spacing at which the production wells do not generate thermal breakthrough within the heat recovery period by utilizing the reasonable production flow of the production wells;
thirdly, calculating the influence area of the cold water reinjection in the heat recovery time by using the well spacing without heat breakthrough of the production well;
determining the reasonable well group number of the target heat storage layer system in the area to be evaluated based on the influence area of the cold water recharging in the heat collecting time;
and fifthly, evaluating the dynamic recoverable resource amount of the well groups and the areas in the heat recovery time by utilizing the reasonable production flow and the reasonable well group quantity of the production wells.
2. The evaluation method according to claim 1, further comprising:
and step six, predicting the heating area of the well group and the area by using the reasonable production flow and the reasonable well group quantity of the production wells.
3. The evaluation method according to claim 2, characterized in that in the sixth step, the method comprises:
determining the heat production power of the well groups and the areas by using the reasonable production flow and the reasonable well group quantity of the production wells;
and calculating the heating area of the well group and the area based on the heating power of the well group and the area according to the heating power of the unit area corresponding to the heating and radiating mode of the user side.
4. The evaluation method according to any one of claims 1 to 3, wherein the first step comprises:
collecting the once-developed water pumping test result of the target heat storage layer of the area to be evaluated;
judging the relation between the water yield of the single well and the depth reduction by adopting a curvature method according to the water pumping test result;
and calculating the water yield of the single well under the reasonable depth reduction condition by utilizing the determined relation between the water yield of the single well and the depth reduction, and taking the water yield of the single well as the reasonable production flow of the production well.
5. The evaluation method according to any one of claims 1 to 4, characterized by comprising, in the second step:
obtaining the migration distance of the cold fluid by using the average speed and the migration time of the cold fluid in the recharge well after entering the reservoir;
and taking the distance of the cold fluid migration as the well spacing at which the production well does not generate heat breakthrough within the heat recovery period.
6. The evaluation method according to claim 5, wherein in the one-production-one-pack development mode, the minimum well spacing of a one-production-one-pack group in which the production well does not thermally break during the heat production time is estimated using the following formula:
D＝Rp
wherein D is the distance between the production well and the recharge well, m is RpThe radius of flow of the recharge well in the heat recovery time is m; m is the reasonable production flow of the production well, M3S; h is the average heat storage thickness m; t is the heat recovery time of the well group, s; r iswTo recharge the wellbore radius, r is the cold water flow radius.
7. The evaluation method according to any one of claims 1 to 6, wherein in the third step,
calculating the radius of the cold front of the recharging well by utilizing the well spacing without thermal breakthrough of the production well;
calculating the radius of the hot front edge of the recharging well by utilizing the radius of the cold front surface of the recharging well and the reasonable production flow of the production well;
and calculating the influence area of the cold water recharging in the heat extraction time based on the radius of the thermal front and the well interval of the production well without thermal breakthrough.
8. The evaluation method according to claim 7,
the radius of the thermal front edge of the recharging cold well is obtained by theoretical analytical calculation of a heat storage fluid energy conservation equation under the condition of local thermal balance;
the energy conservation equation is derived based on the assumption that the confined aquifer heat reservoir is homogeneous, isotropic, of equal thickness, and of equal initial pressure everywhere, and neglects the heat exchange between the heat reservoir and the upper and lower strata.
9. The evaluation method according to any one of claims 1 to 8, wherein in the step five,
determining the amount of geothermal recoverable resources extracted from the target heat storage layer by the single well group according to the temperature of the production well, the recharge temperature and the reasonable production flow of the production well;
and determining the recoverable resource amount of the geothermal heat extracted from the target heat storage layer system in the area to be evaluated based on the recoverable resource amount of the geothermal heat extracted from the target heat storage layer system by the single well group and the reasonable well group number.
10. A system for evaluating the amount of geothermal dynamic recoverable resources of the hydrothermal type, the system performing the evaluation method according to any one of claims 1 to 9.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113065261A (en) * | 2021-04-25 | 2021-07-02 | 中国长江三峡集团有限公司 | Geothermal resource recovery rate evaluation method based on water-thermal coupling simulation |
| CN113294137A (en) * | 2021-01-08 | 2021-08-24 | 西安交通大学 | Method for establishing hydrothermal geothermal well factory and hydrothermal geothermal well factory |
| CN117432399A (en) * | 2023-10-26 | 2024-01-23 | 青岛地质工程勘察院(青岛地质勘查开发局) | Method for calculating recoverable resource of geothermal fluid with pulse heat storage |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060026961A1 (en) * | 2004-08-04 | 2006-02-09 | Bronicki Lucien Y | Method and apparatus for using geothermal energy for the production of power |
| CN107664029A (en) * | 2016-07-28 | 2018-02-06 | 中国石油化工股份有限公司 | The sandstone heat storage optimal well pattern layout method of geothermal energy resources reusable edible |
| CN108846245A (en) * | 2018-07-09 | 2018-11-20 | 清华大学 | City-scale geothermal field multi-boreholes efficient numerical analogy method and device |
-
2019
- 2019-04-09 CN CN201910281551.2A patent/CN111798078A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060026961A1 (en) * | 2004-08-04 | 2006-02-09 | Bronicki Lucien Y | Method and apparatus for using geothermal energy for the production of power |
| CN107664029A (en) * | 2016-07-28 | 2018-02-06 | 中国石油化工股份有限公司 | The sandstone heat storage optimal well pattern layout method of geothermal energy resources reusable edible |
| CN108846245A (en) * | 2018-07-09 | 2018-11-20 | 清华大学 | City-scale geothermal field multi-boreholes efficient numerical analogy method and device |
Non-Patent Citations (5)
| Title |
|---|
| ZHANG LE ETC.: "A simplified assessment method for estimating recoverable geothermal resources", 《GEOTHERMICS》, vol. 79, 29 January 2019 (2019-01-29), pages 145 - 151, XP085611077, DOI: 10.1016/j.geothermics.2019.01.011 * |
| 刘志明;梁继运;刘春雷;: "地热回灌条件下流体可采量评价方法", 地下水, no. 02 * |
| 张红波;: "地热资源可循环利用井网模式评价方法――以东营凹陷中央***带地热田为例", 油气地质与采收率, no. 01 * |
| 朱昶;何平;张岩;宋月梅;: "山东曹县城区地热资源研究", 山东建筑大学学报, no. 04, pages 325 - 330 * |
| 王鹏等: "地热井井位部署及合理井间距浅探", 《化工管理》, pages 72 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113294137A (en) * | 2021-01-08 | 2021-08-24 | 西安交通大学 | Method for establishing hydrothermal geothermal well factory and hydrothermal geothermal well factory |
| CN113065261A (en) * | 2021-04-25 | 2021-07-02 | 中国长江三峡集团有限公司 | Geothermal resource recovery rate evaluation method based on water-thermal coupling simulation |
| CN113065261B (en) * | 2021-04-25 | 2024-01-02 | 中国长江三峡集团有限公司 | Geothermal resource recovery rate evaluation method based on hydrothermal coupling simulation |
| CN117432399A (en) * | 2023-10-26 | 2024-01-23 | 青岛地质工程勘察院(青岛地质勘查开发局) | Method for calculating recoverable resource of geothermal fluid with pulse heat storage |
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