CN113294137A - Method for establishing hydrothermal geothermal well factory and hydrothermal geothermal well factory - Google Patents
Method for establishing hydrothermal geothermal well factory and hydrothermal geothermal well factory Download PDFInfo
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Abstract
The invention relates to the technical field of drilling engineering of geothermal resources, and discloses a method for establishing a hydrothermal geothermal well factory, which comprises the following steps of 1, establishing a geological model; step 2, determining the stable water inflow of the geothermal well; step 3, analyzing the pressure field and determining the well spacing of the geothermal well; step 4, analyzing the temperature field and determining the mining and irrigating well spacing; and 5, deploying the well pattern. The invention also provides a hydrothermal geothermal well factory built according to the method. The invention realizes the centralized drilling and completion operation on one platform, forms a development factory with dense well positions, and intensively drills wells in a production line mode so as to improve the drilling timeliness and realize the centralized management of development.
Description
Technical Field
The invention relates to the technical field of drilling engineering of geothermal resources, in particular to a method for establishing a hydrothermal geothermal well factory and the hydrothermal geothermal well factory.
Background
Geothermal resources refer to renewable heat energy stored in the earth, and the comprehensive development and utilization of geothermal resources have obvious benefits on society, economy and environment, and have shown more and more important roles in developing national economy. The research, development and utilization of geothermal resources are very important for relevant institutions of our government, and departments of land mine, petroleum, coal and the like.
The existing geothermal wells mainly adopt separate management and independent drilling, and need further improvement.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, the present invention provides a method for establishing a hydrothermal geothermal well plant and a hydrothermal geothermal well plant.
In order to realize the purpose, the method for establishing the hydrothermal geothermal well factory adopts the following technical scheme:
a method for establishing a hydrothermal geothermal well factory comprises the following steps:
and 5, deploying the well pattern.
Further, in the step 1, geological modeling is combined with Opengeosys (OGS) software for modeling, and the OGS couples different fields by using a proper numerical method, and mainly includes: (1) water flow fields, i.e. non-isothermal multiphase flow fields: (2) temperature fields, i.e., heat transfer fields within a multi-phase flow system; (3) mechanical fields, i.e. non-isothermal elastic and inelastic deformation fields; (4) chemical fields, i.e. multi-component solute transport and geochemical reaction fields.
Further, the step 2 comprises the following steps:
step 21), obtaining a Q ═ f(s) curve through a fitting pumping test, and calculating the stable water inflow of the single well when different maximum water levels are reduced;
and step 22), combining the simulation result of the geothermal geological concept model to obtain the relation between the thickness of the thermal reservoir and the stable water inflow amount when different water levels are subjected to depth reduction.
Further, the step 2 specifically operates as follows: fitting a relation curve of water inflow Q of the 4 geothermal wells and the maximum water level depth reduction S by adopting a curve error fitting method; trial calculation is carried out in EXCEL software by adopting a least square method, and the relation between the single well stable water inflow Q and the water level depth S is obtained as follows:
S＝0.0007Q2+0.0421Q+0.0981。
according to the geothermal resource geological exploration specification (GB/T11615-2010) requirements: "the pressure reduction value used in calculation is generally not more than 0.3MPa and the maximum is not more than 0.5 MPa", referring to the actual geology and exploitation characteristics of the area, when the maximum water level reduction depth of the geothermal well is calculated to be 10m, 20m, 30m, 40m and 50m respectively, solving an equation to obtain the stable water inflow of the single well which is 63m respectively3/h、96m3/h、 124m3/h、145m3/h、164m3/h。
Further, the step 3 specifically operates as follows:
according to the single-well pumping test data, a Dupuit formula and a Cusco pumping influence radius empirical formula during a pressure-bearing complete well single-well stable flow pumping test are adopted:
in the formula: r-radius of influence (m); k-permeability coefficient (m/d); q is inflow amount (m3/d) of the geothermal well; s-stabilizing water level lowering (m); m-thickness of thermal reservoir (M); r-borehole radius (m);
the numerical simulation calculation result is basically consistent with the calculation result of a theoretical formula, and the larger the water inflow of a single well, the larger the influence radius of the single well; and calculating to obtain the exploitation influence radius of the geothermal well according to the maximum water level depth of the single well, and further determining the optimal geothermal well distance.
Further, the step 4 comprises the following steps:
step 41), calculating the positions of cold front propulsion front edges of different production wells within the heating time period by using a geothermy geological concept model and assuming that the radius of underground water supply is infinite, the water temperature of inflow water of a geothermy well, the recharge temperature of a recharge well, the thickness of a heat storage layer, the maximum water level depth of the geothermy well, the stable water inflow amount of a single well, the number of heating days in a heating period, the recovery water level of the remaining time and the formation heat;
step 42), obtaining the mining and irrigating well distance that the front edge of the cold front in the heating period can not reach the bottom of the geothermal well according to the front edge propulsion diagram of the reinjection water cold front under the condition of different mining and irrigating well distances and a curve graph of the change of the water temperature of the wellhead of the geothermal well under different well distances along with the heating time;
and 43) further combining the reference stratum temperature, and obtaining the optimal production and injection well spacing from the optimal production and injection well spacing curve chart at different recharging temperatures.
Further, the step 5 comprises the following steps:
step 51) development layer system determination;
step 52) determining a cluster pattern.
Further, the step 51) may perform development layer series determination by performing an individual water production gush test on the geothermal well.
Further, the step 52) can be performed according to the actual heating area of the ground community, and the well network can be arranged according to the determination of the well spacing data in a manner of a bench well or a cluster well.
The invention also provides a hydrothermal geothermal well factory built according to the method.
A hydrothermal geothermal well factory is characterized in that a plurality of geothermal well mouths are concentrated in a minimum area, and a well hole is distributed in a multidirectional mode.
Furthermore, when the burial depth of the top boundary of a thermal reservoir exceeds 2000 meters, the hydrothermal geothermal well factory is a four-well or a six-well, the spacing between well heads is 6 meters, the azimuth difference of each well is 60 degrees, and the horizontal displacement of an A target by 500 meters can meet the requirement that the spacing between wells exceeds 500 meters.
If the buried depth is deeper, more geothermal wells can be arranged on the corresponding drilling platform.
Furthermore, the hydrothermal geothermal well factory can be provided with a geothermal resource dynamic monitoring system and purification devices for removing sand and exhausting gas from geothermal water, and efficient centralized standardized management can be realized.
Compared with the prior art, the application provides a method for establishing a hydrothermal geothermal well factory and the hydrothermal geothermal well factory. The geothermal well factory is to utilize the geosteering drilling technology to reasonably optimize the well pattern, to intensively perform the drilling and completion operation on a platform, to form a development factory with intensive well positions, to intensively drill the wells in a production line manner, to improve the drilling timeliness, and to realize the centralized management of the development. The hydrothermal geothermal well plant specifically comprises the following advantages:
(1) the geothermal well factory concentrates a plurality of geothermal well mouths in a minimum area, and the well bores are distributed in multiple directions, so that the scale, high-efficiency, green and sustainable geothermal heat source supply system capable of realizing the 'mining and filling balanced circulation' of geothermal resources is realized.
(2) The geothermal well factory system is provided with a geothermal resource dynamic monitoring system and purification devices for removing sand and exhausting gas of geothermal water, and can realize high-efficiency centralized standardized management.
(3) The system is suitable for the ground drilling well position shortage or large geothermal heating project, and can obviously reduce the well mouth floor area and the engineering construction cost.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a schematic view of a geogeology conceptual model according to example 1;
FIG. 2 is a diagram showing the forward edge of a reinjection water cold front under different well spacing conditions;
FIG. 3 is a graph showing the change of water temperature of a wellhead of a geothermal well with different well spacing along with heating time;
FIG. 4 is a graph of the optimal interval between production wells at different recharge temperatures;
FIG. 5 is a comparison of well pattern deployment for different patterns;
FIG. 6 is a schematic diagram of a three-target circle well group structure;
FIG. 7 is a schematic plan view of a three target circle well group;
FIG. 8 is a schematic diagram of a cluster well configuration;
FIG. 9 is a schematic plan view of a cluster well set;
FIG. 10 is a plan view of a cluster well set;
FIG. 11 is a layout of a three-target circle well group in use;
FIG. 12 is a schematic diagram of a cluster well array in use;
FIG. 13 is a borehole trajectory orthographic view;
FIG. 14 is a horizontal projection of the wellbore trajectory;
FIG. 15 is a well pattern plot of a well plant;
FIG. 16 is a three-dimensional diagram of a well plant;
FIG. 17 is a three-dimensional view II of a well plant;
FIG. 18 is a borehole trajectory correction map (Ladderplot ladder);
fig. 19 is a borehole trajectory correction chart (seperationfractorplot).
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will aid those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All fall within the scope of the invention.
Example 1
In this embodiment, a basin in Guanzhong Shanxi province is taken as an example to establish a hydrothermal geothermal well plant.
The method for establishing the hydrothermal geothermal well factory comprises the following steps:
establishing a Guanzhong basin geogeology conceptual model according to the thickness distribution range of the geothermal heat storage layer, as shown in figure 1; the average thickness of the geothermal reservoir of the Zhang Jia slope group model is 121m, the porosity of the geothermal reservoir is 30.0 percent, the diameter of a second well completion well is 177.8mm, the temperature of the geothermal reservoir is 75.0 ℃, and the average formation pressure is 13.0 multiplied by 106 Pa. The average thickness of a heat storage reservoir of the Lantian-dam group model is 241m, the porosity of the heat storage reservoir is 28.0%, the second well completion opening diameter is 177.8mm, and the temperature of the heat storage reservoir is 100.0 ℃. The average thickness of the geothermal heat storage reservoir of the Ganling group model is 166m, the porosity of the heat storage is 20.0%, the second-cut hole diameter of the well completion is 177.8mm, and the temperature of the heat storage is 120.0 ℃.
The geological modeling is combined with OpenGeoSys software for modeling, mainly the basin sandstone heat storage type and the stratum buried depth in Shaanxi Guangxi, a mathematical model in the geothermal energy development process usually relates to the coupling of a water flow field and a temperature field, and the mathematical model is also coupled with a stress field when the rock deformation under high temperature and high pressure is processed; when chemical reaction processes such as dissolution-precipitation are considered, a coupled chemical field is required. The OGS kernel establishes a series of state Equations (EOS) for operation based on mass conservation and energy conservation laws. The OGS adopts a proper numerical method to couple different fields, and mainly comprises the following steps: (1) a water flow field, i.e. a non-isothermal multiphase flow motion field; (2) temperature fields, i.e., heat transfer fields within multiphase flow systems; (3) mechanical fields, i.e., non-isothermal elastic and inelastic deformation fields; (4) chemical fields, i.e. multi-component solute transport and geochemical reaction fields. Realizes the sustainable development of hydrothermal geothermal energy, and recharging is a necessary way. On one hand, the device can maintain the stability of heat storage pressure, and on the other hand, the device can prevent hot water from polluting the earth surface and shallow underground water. However, if the recharging well is improperly arranged, thermal breakthrough, i.e. the temperature of the water in the thermal storage is reduced, and the service life of the thermal field is reduced, so that numerical simulation technology is required to simulate the temperature and pressure response of the thermal storage under different mining and recharging situations. The problem of scaling is often produced in the development and utilization process of hydrothermal geothermal energy, the production capacity of a hot field is reduced, the mineral precipitation process can be simulated through a numerical method, and the scaling formation mechanism is analyzed. In addition, aiming at the deep well heat exchange technology concerned by many domestic enterprises in recent years, the OGS can also simulate and calculate the heat exchange quantity of the deep well heat exchange and predict the long-term ground temperature change. Taking the hydrothermal geothermal energy as an example for heating, a set of method for reasonably setting the mining and irrigating well spacing is established. The method combines numerical simulation and an economic analysis method, and uses the minimum economic loss generated by the reduction of heat storage and the reduction of water temperature brought by recharging as an objective function to find the optimal well spacing for mining and recharging. Wherein, the numerical simulation part adopts OGS to give the response of temperature and water level under different well spacing. The method comprises the steps of setting the exploitation and the recharge (the recharge rate is 100%) of a certain geothermal field in 50 years, arranging a recharge well at the downstream of an exploitation well, and carrying out cost accounting when the well spacing is changed from 100m to 1000m, and the temperature and the water head in a reservoir respond to the temperature of the exploitation well and change very slightly within 50 years so as to determine the optimal well spacing.
step 21), obtaining a Q ═ f(s) curve through a fitting pumping test, and calculating the stable water inflow of the single well when different maximum water levels are reduced;
and step 22), combining the simulation result of the geothermal geological concept model to obtain the relation between the thickness of the thermal reservoir and the stable water inflow amount when different water levels are subjected to depth reduction.
Firstly, the Q ═ f(s) curve obtained by the pumping test is fitted, and the stable water inflow of a single well at different maximum water level depths is calculated. And then, combining the numerical simulation result to obtain the corresponding relation between the single-well stable water inflow and the reservoir thickness when the water level is reduced by 20 m.
And fitting a relation curve between the water inflow Q of the 4 geothermal wells and the maximum water level depth reduction S by adopting a curve error fitting method. The least square method is adopted in EXCEL software for trial calculation, and the result shows that the fitting error C of a parabolic equation is 0.003%, the fitting error C of an exponential equation is 2.102%, and the fitting error C of a linear equation is 0.641%, according to the stipulation of geological survey regulations of geothermal resources (GB/T11615-2010), the pumping test curve is most suitable for fitting by adopting the parabolic equation, so that the relation between the stable water inflow Q of a single well and the water level depth S is as follows:
S＝0.0007Q2+0.0421Q+0.0981。
according to the geothermal resource geological exploration specification (GB/T11615-2010) requirements: "the pressure reduction value used in calculation is generally not more than 0.3MPa and the maximum is not more than 0.5 MPa", referring to the actual geology and exploitation characteristics of the area, when the maximum water level reduction depth of the geothermal well is calculated to be 10m, 20m, 30m, 40m and 50m respectively, solving an equation to obtain the stable water inflow of the single well which is 63m respectively3/h、96m3/h、 124m3/h、145m3/h、164m3/h。
And calculating to obtain a relation chart between the thickness of the thermal reservoir and the stable water inflow amount when different water levels are subjected to depth reduction through the numerical simulation of the geothermal reservoir under the condition of different thicknesses of the thermal reservoir.
according to the single-well pumping test data, a Dupuit formula and a Cusco pumping influence radius empirical formula during a pressure-bearing complete well single-well stable flow pumping test are adopted:
in the formula: r-radius of influence (m); k-permeability coefficient (m/d); q is inflow amount (m3/d) of the geothermal well; s-stabilizing water level lowering (m); m-thickness of thermal reservoir (M); r-borehole radius (m).
The numerical simulation calculation result is basically consistent with the calculation result of a theoretical formula, and the larger the water inflow of a single well is, the larger the influence radius is. The numerical simulation calculation result is basically consistent with the calculation result of a theoretical formula, and the larger the single well water burst is, the larger the influence radius is. When the maximum water level of a single well is reduced by 30m, the stable water inrush quantity is 124m3And/h, calculating the geothermal well production influence radius 246m, so that the optimal geothermal well spacing is 500 m.
step 41), by utilizing a geothermy concept model, assuming that the radius of underground water supply is infinite, the water temperature of water burst of a geothermy well is 56 ℃, the recharging temperature of a recharging well is 15 ℃, the thickness of a heat storage layer is 191m, the maximum water level of the geothermy well is reduced by 20m, and when the stable water inflow amount of a single well is 112m3/h, the heating is carried out for 120d in one heating period, the water level and the heat of the stratum are recovered in the rest time, the heating time is calculated for 100 years, and the cold front propelling front edge positions of different mining and recharging wells are spaced;
and 42) according to the propelling diagram of the front edge of the reinjection water cold front under the condition of different mining and injection well distances in the graph in the figure 2 (obtained according to the model in the figure 1) and the curve diagram of the change of the water temperature of the wellhead of the geothermal well under different well distances in the figure 3 (obtained by matching a geological data model and the existing operation data) along with the heating time, it can be seen that when the mining and injection well distance is 200-400 m, the front edge of the back edge of the reinjection water cold front reaches the bottom of the geothermal well in a heating period of 100 years, and the water temperature of the geothermal well is reduced. Only if the distance between the mining and filling wells is more than 500m, the front edge of the cold front cannot reach the bottom of the geothermal well within the heating period of 100 years;
and 43), similarly, calculating the optimal distance between the production wells and the injection wells according to the reference stratum temperature and the injection well injection water temperature of 30 ℃, 35 ℃, 40 ℃, 45 ℃ and 50 ℃, and as can be seen from the figure 4 (obtained by fitting a geological data model and the existing operation data), when the injection well injection water temperature is increased from 30 ℃ to 40 ℃, the optimal distance between the production wells and the injection wells is reduced from 612m to 379 m.
step 51) development layer system determination:
the heat wells in the Guanzhong basin in Shaanxi do not have single-layer mining data of Gaolu group, and the current main mining layers of the geothermal wells in the Guanzhong basin are Lantian-dam rivers and Gaolu sandstone heat storage, and the Lantian-dam rivers are mainly used. The integral characteristics of high temperature of geothermal water and large water inflow. The distribution of the existing geothermal well conditions in the closed basin is shown in table 1 below.
TABLE 1 State distribution table for existing geothermal wells in Guanzhong basin
The thickness of the high-bay group sand is about the blue-dam group 1/2, the logging interpretation permeability is also lower, about the main power layer blue-dam group 1/4, and the reservoir physical properties are poor. The existing data prove that the layer does not have the material basis of developing a layer system in the aspects of physical property and thickness. However, as the area has no single-mining data and has less data of drilling through the geothermal wells of the high-tomb group, the single-mining water burst test is carried out on the geothermal wells of the high-tomb group drilled through the area.
Step 52) determining the cluster well pattern form:
well patterns include two-point, four-point, six-point patterns, etc., as shown in fig. 5. Because the geothermal wells are deployed in urban areas, the ground land acquisition cost is high, in order to save investment, under the condition that the number of the mining and filling wells in the area is basically the same, a specific well arrangement mode can be selected according to the actual heating area of a ground community, and a well pattern can be arranged according to the determination of well spacing data and the modes of a table type well (a three-target circle well is a technical mode of the table type well) and a cluster type well (as shown in figures 6-10) to build a basin group mining and filling demonstration area in Shanxi Guanzhong. Meanwhile, heat supply in the closing basin region is mainly distributed heat supply, large-scale area development is not performed temporarily, and the later-stage implementation project is a single-point project.
Taking the recharging well recharging water temperature of 35 ℃ as an example, according to the numerical simulation result, the distance between the recharging wells in the first-mining and recharging mode is 500m, and the recharging ratio is 1: 1, the temperature of the wellhead of the production well is not changed, and the heating requirement can be met. And performing scientific and reasonable well arrangement according to the heat load requirement in the area.
When the top boundary burial depth of the thermal reservoir exceeds 2000 meters, one four-well and one six-well can be considered in design, namely, directional wells are arranged, the spacing between well heads is 6 meters, the azimuth difference of each well is 60 degrees, and the horizontal displacement of the A target is 500 meters, so that the spacing between wells can exceed 500 meters. If the buried depth is deeper, more geothermal wells can be arranged on the corresponding drilling platform.
FIGS. 11 and 12 are schematic views of the three target circle well group and the cluster well group, respectively, in use. FIG. 15 is a well pattern plot of a well plant; FIG. 16 is a three-dimensional diagram of a well plant; FIG. 17 is a three-dimensional view II of a well plant.
The target point data is shown in table 2, and the collision prevention data is shown in table 3.
TABLE 2 data sheet of target points
TABLE 3 Collision prevention data sheet
According to the drilling geological requirements, combining with the characteristics of the stratum of the block, the well body quality design is carried out according to the technical requirements of New Star petroleum Q/SH1050-2019 'guiding rule of geothermal well drilling technology' and cluster wells, and the specific requirements are shown in the following tables 4-6.
TABLE 4 well bore quality requirements
TABLE 5 quality requirements for directional interval well bore
TABLE 6 target data
The well cementation quality evaluation is carried out according to the standard of 'well cementation quality evaluation method' (SY/T6592-2016).
TABLE 7 well cementation quality requirements
The wellbore trajectory base parameter design and trajectory design are shown in tables 8 and 9. Reference may be made to FIG. 13, FIG. 14, FIG. 18 (Ladderplot ladder) and FIG. 19 (SeperationFactorPlot separation factor plot) borehole trajectory vertical projection plots, borehole trajectory horizontal projection plots, and borehole trajectory correction plots.
TABLE 8 basic parameters design table for well track
Track type: straight-increasing-steady-decreasing
Note: and (4) carrying out on-site rechecking before construction, such as magnetic dip angle, magnetic declination angle, magnetic field intensity and the like.
TABLE 9 track design data sheet
Note: firstly, profile data is designed according to initial measurement coordinates of a wellhead, and a re-measurement coordinate is used for checking a well profile in actual construction.
Secondly, the height of the bushing is not considered in the engineering design well depth, and the actual height of the bushing is used for checking the well depth in actual construction.
And thirdly, well quality monitoring is carried out.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention.
Claims (10)
1. A method for establishing a hydrothermal geothermal well factory is characterized by comprising the following steps:
step 1, geological model establishment: establishing a geothermy geological concept model according to the distribution range of the thickness of the geothermy reservoir;
step 2, determining the stable water inflow of the geothermal well;
step 3, analyzing the pressure field and determining the well spacing of the geothermal well;
step 4, analyzing the temperature field and determining the mining and irrigating well spacing;
and 5, deploying the well pattern.
2. Method for establishing a hydrothermal geothermal well plant according to claim 1, characterized in that step 2 comprises the following steps:
step 21), obtaining a Q ═ f(s) curve through a fitting pumping test, and calculating the stable water inflow of the single well when different maximum water levels are reduced;
and step 22), combining the simulation result of the geothermal geological concept model to obtain the relation between the thickness of the thermal reservoir and the stable water inflow amount when different water levels are subjected to depth reduction.
3. Method for establishing a hydrothermal geothermal well plant according to claim 2, characterized in that step 2 is carried out in particular as follows: fitting a relation curve of water inflow Q of the 4 geothermal wells and the maximum water level depth reduction S by adopting a curve error fitting method; trial calculation is carried out in EXCEL software by adopting a least square method, and the relation between the single well stable water inflow Q and the water level depth S is obtained as follows:
S＝0.0007Q2+0.0421Q+0.0981。
4. method for establishing a hydrothermal geothermal well plant according to claim 1, characterized in that step 3 is performed in particular as follows:
according to the single-well pumping test data, a Dupuit formula and a Cusco pumping influence radius empirical formula during a pressure-bearing complete well single-well stable flow pumping test are adopted:
in the formula: r-radius of influence (m); k-permeability coefficient (m/d); q is inflow amount (m3/d) of the geothermal well; s-stabilizing water level lowering (m); m-thickness of thermal reservoir (M); r-borehole radius (m);
the numerical simulation calculation result is basically consistent with the calculation result of a theoretical formula, and the larger the water inflow of a single well is, the larger the influence radius is; and calculating to obtain the exploitation influence radius of the geothermal well according to the maximum water level depth of the single well, and further determining the optimal geothermal well distance.
5. Method for establishing a hydrothermal geothermal well plant according to claim 1, characterized in that the step 4 comprises the following steps:
step 41), calculating cold front propulsion front positions of different mining and injection wells within the heating time period by using a geothermy geological conceptual model and assuming that the radius of underground water supply is infinite, the water temperature of inflow water of a geothermy well, the recharge temperature of a recharge well, the thickness of a heat storage layer, the maximum water level depth of the geothermy well, the stable inflow amount of a single well, the heating days in a heating period and the residual time restore water level and the formation heat;
step 42), obtaining the mining and irrigating well distance that the front edge of the cold front in the heating cycle can not reach the bottom of the geothermal well according to the front edge propulsion diagram of the back-irrigation water cold front under the condition of different mining and irrigating well distances and a curve graph of the change of the water temperature of the wellhead of the geothermal well under different well distances along with the heating time;
and 43) further combining the reference stratum temperature, and obtaining the optimal production and injection well spacing from the optimal production and injection well spacing curve chart at different recharging temperatures.
6. Method for establishing a hydrothermal geothermal well plant according to claim 1, characterized in that the step 5 comprises the following steps:
step 51) development layer system determination;
step 52) determining a cluster pattern.
7. Method for establishing a hydrothermal geothermal well plant according to claim 6, wherein step 51) is carried out by conducting a development layer series determination by conducting an extraction water burst test on the geothermal well.
8. The method of setting up a hydrothermal geothermal well plant according to claim 1, wherein step 52) is performed by selecting the actual heating area of the surface sub-area and arranging the well pattern in a pattern of bench wells or cluster wells based on the determination of the well spacing data.
9. A hydrothermal geothermal well plant according to any one of claims 1 to 8, built by a method of building the hydrothermal geothermal well plant, wherein the plurality of geothermal well wellheads are concentrated in a minimum area and the wellheads are distributed in multiple orientations.
10. The hydrothermal geothermal well plant of claim 9, wherein when the burial depth of the top boundary of the thermal reservoir exceeds 2000 m, the well is a four-well or a six-well, the spacing between the well heads is 6m, the azimuth of each well differs by 60 °, and the horizontal displacement of the a target by 500m satisfies the requirement that the spacing between the wells exceeds 500 m.
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| CN114575836A (en) * | 2022-01-27 | 2022-06-03 | 陕西煤田地质勘查研究院有限公司 | Method for improving mining and irrigating efficiency of hydrothermal geothermal well group |
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