CN113446744A - Geothermal reservoir production and irrigation simulation test system suitable for unconsolidated sandstone - Google Patents
Geothermal reservoir production and irrigation simulation test system suitable for unconsolidated sandstone Download PDFInfo
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- CN113446744A CN113446744A CN202110663449.6A CN202110663449A CN113446744A CN 113446744 A CN113446744 A CN 113446744A CN 202110663449 A CN202110663449 A CN 202110663449A CN 113446744 A CN113446744 A CN 113446744A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24T—GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
- F24T10/00—Geothermal collectors
- F24T10/20—Geothermal collectors using underground water as working fluid; using working fluid injected directly into the ground, e.g. using injection wells and recovery wells
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24T—GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
- F24T10/00—Geothermal collectors
- F24T2010/50—Component parts, details or accessories
- F24T2010/56—Control arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24T—GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
- F24T2201/00—Prediction; Simulation
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- 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
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Abstract
The invention provides a production and irrigation simulation test system suitable for unconsolidated sandstone geothermal reservoir, which comprises a first simulation system and an overburden pressure simulation system which are connected with each other; the first simulation system comprises a geothermal reservoir simulation system and a geothermal water production and irrigation simulation system which are connected, wherein the geothermal reservoir simulation system is used for simulating an unconsolidated sandstone geothermal reservoir, and the geothermal water production and irrigation simulation system is used for simulating a geothermal production and irrigation process of the unconsolidated sandstone geothermal reservoir; and the overburden pressure simulation system is used for simulating the overburden pressure of the unconsolidated sandstone geothermal reservoir. The method is used for simulating the extraction and irrigation process of the unconsolidated sandstone geothermal reservoir, and provides data support for the problem research in the extraction and irrigation process of the unconsolidated sandstone geothermal reservoir.
Description
Technical Field
The invention relates to the technical field of geothermal resource development, in particular to a geothermal reservoir mining and irrigating simulation test system suitable for unconsolidated sandstone.
Background
Global fossil energy is continuously consumed since the second industrial revolution, and the future faces the risk of exhaustion. Geothermal resources are used as clean energy, and are regarded as one of the development directions of future energy by countries in the world due to the advantages of huge reserves, wide distribution and the like. China is a big country for utilizing hydrothermal geothermal resources at present, and the direct utilization amount is the first place in the world. Most of hydrothermal resource reservoir rocks are unconsolidated sandstones, and geothermal recharge is needed in order to protect geological environment and realize sustainable development of geothermal resources in the process of mining hydrothermal geothermal resources. Geothermal recharging is one of the necessary measures for maintaining the sustainable development and utilization of geothermal fields, namely, geothermal recharging is to recharge geothermal tail water to thermal storage naturally or by pressurization through a recharging system, and the purposes of the geothermal recharging are mainly to treat geothermal tail water, improve or recover the heat production capacity of the thermal storage, maintain the fluid pressure of the thermal storage and maintain the exploitation conditions of the geothermal fields. How to maintain the heat production capacity and the exploitation conditions of the reservoir on the premise that the water extraction quantity meets the heat demand is an important ring for ensuring the sustainable development and utilization of geothermal heat at present. At present, sandstone thermal storage tail water recharge faces the problems of higher formation pressure, thermal storage blockage, sand production and the like, and needs to be solved urgently.
Disclosure of Invention
The invention discloses a simulation test system suitable for the exploitation and irrigation of an unconsolidated sandstone geothermal reservoir, which provides technical support for researching related scientific problems encountered in the exploitation and irrigation process of the unconsolidated sandstone geothermal reservoir.
The invention provides a geothermal reservoir production and irrigation simulation test system suitable for unconsolidated sandstone, which is characterized by comprising the following components in percentage by weight:
the geothermal reservoir simulation system, the geothermal water production and irrigation simulation system and the overburden pressure simulation system are connected;
the geothermal reservoir simulation system is used for simulating an unconsolidated sandstone geothermal reservoir;
the geothermal water mining and irrigating simulation system is used for simulating a geothermal mining and irrigating process of the unconsolidated sandstone geothermal reservoir;
and the overburden pressure simulation system is used for simulating the overburden pressure of the unconsolidated sandstone geothermal reservoir.
Further, the geothermal reservoir simulation system comprises:
the device comprises a shell, a heat source module, a temperature control module, a first heat preservation module, a second heat preservation module, a reservoir and an upper covering plate;
the heat source module is arranged at the bottom of the shell, the temperature control module is connected with the heat source module, the first heat preservation module is arranged on the side wall of the shell in a built-in mode, the second heat preservation module covers the upper surface of the reservoir, the reservoir is filled in the shell, and the upper covering plate covers the second heat preservation module;
the heat source module is used for heating;
the temperature control module is used for regulating and controlling the reservoir temperature;
the first heat preservation module and the second heat preservation module are used for reducing heat loss of the system and maintaining the temperature of the system in a stable state;
the upper covering plate is used for simulating the upper covering layer of the geothermal reservoir.
Further, the geothermal water adopts and irritates analog system includes:
the system comprises a first water tank, a first pump body and a recharge well which are sequentially connected through a first high-pressure pipeline, and a production well, a second pump body and a second water tank which are sequentially connected through a second high-pressure pipeline, wherein the recharge well and the production well are vertically arranged in a reservoir stratum;
the first pump body is used for injecting the test fluid of the first water tank into the reservoir through the recharging well, and the second pump body is used for extracting the test fluid from the production well and storing the test fluid in the second water tank.
Further, geothermal water adopts and irritates analog system still includes:
the sand control pipe network is arranged at the lower end of the production well;
the sand control pipe network is used for preventing gravel from blocking the fluid channel.
Further, the overburden pressure simulation system includes:
the device comprises a third pump body, an upper covering pressure seat and a third high-pressure pipeline, wherein the upper covering pressure seat is arranged on the geothermal reservoir simulation system, the third pump body applies pressure to the upper covering pressure seat through the third high-pressure pipeline, and the upper covering pressure seat transmits the pressure to the geothermal reservoir simulation system.
Further, the geothermal reservoir production and irrigation simulation test system further comprises:
and the data acquisition system is connected with the geothermal reservoir production and irrigation simulation test system and is used for monitoring and acquiring the working state data suitable for the unconsolidated sandstone geothermal reservoir production and irrigation simulation test system.
Further, the data acquisition system further comprises:
the first temperature gauge, the first flow meter and the first pressure gauge are sequentially arranged at the inlet of the recharging well from top to bottom and are respectively used for measuring the temperature, the flow and the pressure of fluid at the inlet of the recharging well;
a temperature sensor disposed in the reservoir;
the second pressure gauge, the second flowmeter and the second thermometer are sequentially arranged at the outlet of the production well from top to bottom and are respectively used for measuring the pressure, the flow and the temperature of the fluid at the outlet of the production well;
the displacement recorder and the overlying pressure gauge are arranged on the overlying cover plate and are respectively used for monitoring the displacement and the pressure of the overlying cover plate.
Further, the first pump body is a constant-speed constant-pressure injection pump.
Further, the second pump body is a constant-speed constant-pressure water pump.
Further, the third pump body is a constant pressure hydraulic pump.
The invention discloses a simulation test system suitable for the mining and filling of unconsolidated sandstone geothermal reservoir, which is characterized in that a constant-speed constant-pressure pump injects water in a constant-temperature water tank into a recharging well according to certain pressure or speed in the simulation process, the water is extracted from a mining well by a constant-speed constant-pressure water pump after passing through the reservoir and enters an outlet liquid storage tank, and thus, the simulation of the sandstone geothermal mining and filling process is realized.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
FIG. 1 is a schematic diagram of a geothermal reservoir production and irrigation simulation test system suitable for unconsolidated sandstone in an embodiment of the invention;
in the figure: 1. an outer container; 2. a heat source plate; 3. a temperature control device; 4. a thermal insulation board; 5. a reservoir; 6. Covering a cover plate; 7. recharging the well; 8. a production well is produced; 9. a constant temperature water tank; 10. a constant-speed constant-pressure injection pump; 11. A recharge well thermometer; 12. a recharging well flow meter; 13. a recharging well pressure gauge; 14. a temperature sensor; 15. A sand control pipe screen; 16. a production well pressure gauge; 17. a production well flow meter; 18. a production well thermometer; 19. Covering a pressure seat; 20. covering a pressure gauge; 21. a high pressure line; 22. a constant pressure hydraulic pump; 23. a constant-speed constant-pressure water pump; 24. a liquid storage tank; 25. displacement recorder
Detailed Description
Various exemplary embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to specific embodiments and the accompanying drawings.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
Example one, as shown in fig. 1, is a geothermal reservoir production and irrigation simulation test system suitable for unconsolidated sandstone,
the system comprises an unconsolidated sandstone geothermal reservoir mining and irrigating simulation system and an overlying pressure simulation system; the unconsolidated sandstone geothermal reservoir production and irrigation simulation system comprises an unconsolidated sandstone geothermal reservoir simulation system and an unconsolidated sandstone geothermal reservoir production and irrigation simulation system. The unconsolidated sandstone geothermal reservoir simulation system is used for realizing simulation of a geothermal reservoir of unconsolidated sandstone at high temperature and high pressure, and an unconsolidated sandstone geothermal reservoir 5 is formed by filling sand with a certain proportion into an external container 1; the power equipment and the flow path required in the process of collecting the unconsolidated sandstone geothermal reservoir exploitation and irrigation simulated geothermal water comprise a 7-recharging well, an 8-exploiting well, a 10 constant-speed constant-pressure injection pump, a 21 high-pressure pipeline and a 23 constant-speed constant-pressure water suction pump; the constant-speed constant-pressure injection pump 10 and the constant-speed constant-pressure water pump 23 are used for providing power for the flow of experimental liquid in a test instrument and simulating the mining and filling power of an unconsolidated sandstone geothermal reservoir; the recharging well 7 and the production well 8 are respectively used for simulating a recharging well and a production well in the unconsolidated sandstone geothermal exploitation process; the lower end of the production well 8 is also provided with a sand control screen network 15 for preventing sand from entering a downstream line to cause blockage and instrument damage.
The geothermal reservoir production and irrigation simulation test system suitable for the unconsolidated sandstone also comprises an overburden pressure simulation system used for simulating the overburden formation pressure of the unconsolidated sandstone, wherein the overburden pressure simulation system comprises a constant pressure hydraulic pump 22, a high pressure pipeline 21 and an overburden pressure seat 19; the constant pressure hydraulic pump 22 transmits pressure through the high pressure line 21 to the overlying pressure seat 19, which then transmits pressure to the overlying covering plate 6, which then transmits pressure evenly to the reservoir simulation site.
In the second embodiment, the geothermal reservoir production and irrigation simulation test system suitable for unconsolidated sandstone in the first embodiment further comprises a data monitoring and collecting system, wherein the data monitoring and collecting system is used for monitoring the state of the whole simulation test system and automatically recording, and comprises a linear temperature sensor 14 arranged in the reservoir 5; a recharging well thermometer 11, a recharging well flowmeter 12 and a recharging well pressure gauge 13 which are arranged at the inlet of the recharging well 7; a production well pressure gauge 16, a production well flowmeter 17 and a production well thermometer 18 which are arranged at the outlet of the production well; in addition, a displacement recorder 25 and a floating pressure gauge 20 are arranged on the upper covering plate and used for monitoring the displacement and pressure conditions of the upper covering plate so as to monitor the settlement condition of the temperature reservoir.
The data monitoring and collecting system is used for collecting the data of fluid flow, fluid temperature and pressure of a production well, the fluid pressure, fluid temperature and fluid flow of a recharge well, the reservoir temperature, the reservoir settlement displacement and the overburden pressure in the process of carrying out the production and recharge simulation test on the unconsolidated sandstone geothermal reservoir.
In the second embodiment, before the geothermal reservoir production and irrigation simulation test system for unconsolidated sandstone is started, the system further comprises a reservoir preparation stage, wherein the reservoir preparation stage needs to be provided with sand for simulating a stratum according to certain reservoir characteristic requirements according to research needs:
the heat source plate 2 is firstly placed at the bottom of the outer container 1, the heat insulation plates 4 are placed around the outer container 1, then the prepared gravel is placed in the heat insulation plates, meanwhile, the temperature sensor 14 is placed in the heat insulation plates according to the research requirement, and then the heat insulation plates 4 and the upper covering plate 6 are covered on the upper portion.
Test fluid is injected into the reservoir 5 through a recharge well according to research needs, hydraulic oil is applied to the overlying pressure seat 19 through the constant-pressure hydraulic pump 22, and then the overlying pressure seat 19 transmits the pressure to the upper covering plate 6 to apply formation pressure to the reservoir 5.
The heating power of the heat source plate 2 is controlled by the temperature control device 3, so that the temperature of the reservoir 5 reaches the temperature required by research.
After the reservoir simulation preparation is completed, the production and irrigation simulation stage is started, and at this time, the rest parts need to be installed according to the mode shown in fig. 1, and the tightness, the safety and the like of the instrument are checked.
And then, after all the components in the device are fully equipped, the simulation work of the extraction and irrigation process of the unconsolidated sandstone geothermal reservoir can be started, at this time, the whole device is heated through an electric heating plate, and after the whole device is heated to a preset temperature and is maintained for a certain time, the temperature of the whole device is ensured to reach an equilibrium state.
And then opening a constant-speed constant-pressure injection pump, adjusting to a fluid parameter (generally a fluid injection speed) required by the simulation process, and injecting the fluid in the constant-temperature water tank 9 into the reservoir 5 through a pipeline to perform the recharge simulation of the unconsolidated sandstone geothermal reservoir.
Or the fluid medium in the unconsolidated sandstone geothermal reservoir system is extracted from the production well 8 by the constant-speed constant-pressure water pump 23 and stored in the liquid storage tank 24, so that the geothermal reservoir geothermal water production simulation is realized.
Finally, collecting relevant experimental parameters through the data monitoring and collecting system according to requirements comprises: production well flow, temperature and pressure; the flow, pressure and temperature of the recharging well, the displacement of the upper covering plate, the upper covering pressure, the reservoir temperature and the like provide data for later-stage research.
The above description is only exemplary of the present invention and should not be taken as limiting the invention, as any modification, equivalent replacement, or improvement made within the spirit and scope of the present invention should be included in the present invention.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.
Claims (10)
1. A geothermal reservoir production and irrigation simulation test system suitable for unconsolidated sandstone is characterized by comprising the following components: the geothermal reservoir simulation system, the geothermal water production and irrigation simulation system and the overburden pressure simulation system are connected;
the geothermal reservoir simulation system is used for simulating an unconsolidated sandstone geothermal reservoir;
the geothermal water mining and irrigating simulation system is used for simulating a geothermal mining and irrigating process of the unconsolidated sandstone geothermal reservoir;
and the overburden pressure simulation system is used for simulating the overburden pressure of the unconsolidated sandstone geothermal reservoir.
2. A geothermal reservoir stimulation test system for unconsolidated sandstone rock according to claim 1 wherein the geothermal reservoir stimulation system comprises:
the device comprises a shell, a heat source module, a temperature control module, a first heat preservation module, a second heat preservation module, a reservoir and an upper covering plate;
the heat source module is arranged at the bottom of the shell, the temperature control module is connected with the heat source module, the first heat preservation module is arranged on the side wall of the shell in a built-in mode, the second heat preservation module covers the upper surface of the reservoir, the reservoir is filled in the shell, and the upper covering plate covers the second heat preservation module;
the heat source module is used for heating;
the temperature control module is used for regulating and controlling the reservoir temperature;
the first heat preservation module and the second heat preservation module are used for reducing heat loss of the system and maintaining the temperature of the system in a stable state;
the upper covering plate is used for simulating the upper covering layer of the geothermal reservoir.
3. A geothermal reservoir production and irrigation simulation test system suitable for unconsolidated sandstones as defined in claim 1 wherein the geothermal water production and irrigation simulation system comprises:
the system comprises a first water tank, a first pump body and a recharge well which are sequentially connected through a first high-pressure pipeline, and a production well, a second pump body and a second water tank which are sequentially connected through a second high-pressure pipeline, wherein the recharge well and the production well are vertically arranged in a reservoir stratum;
the first pump body is used for injecting the test fluid in the first water tank into the reservoir through the recharging well, and the second pump body is used for extracting the test fluid from the production well and storing the test fluid in the second water tank.
4. A geothermal reservoir production and irrigation simulation test system suitable for unconsolidated sandstones according to claim 3, wherein the geothermal water production and irrigation simulation system further comprises:
the sand control pipe network is arranged at the lower end of the production well;
the sand control pipe network is used for preventing gravel from blocking the fluid channel.
5. A geothermal reservoir stimulation test system for unconsolidated sandstone rock according to claim 1 wherein the overburden pressure simulation system comprises:
the device comprises a third pump body, an upper covering pressure seat and a third high-pressure pipeline, wherein the upper covering pressure seat is arranged on the geothermal reservoir simulation system, the third pump body applies pressure to the upper covering pressure seat through the third high-pressure pipeline, and the upper covering pressure seat transmits the pressure to the geothermal reservoir simulation system.
6. A geothermal reservoir production and irrigation simulation test system suitable for unconsolidated sandstones as claimed in any one of claims 1 to 5 wherein the geothermal reservoir production and irrigation simulation test system further comprises: the data acquisition system is connected with the geothermal reservoir production and irrigation simulation test system;
the data acquisition system is used for monitoring and acquiring the working state data of the simulation test system suitable for the extraction and irrigation of the unconsolidated sandstone geothermal reservoir.
7. A geothermal reservoir stimulation test system for unconsolidated sandstone rock according to claim 6 wherein the data acquisition system further comprises:
the first temperature gauge, the first flow meter and the first pressure gauge are sequentially arranged at the inlet of the recharging well from top to bottom and are respectively used for measuring the temperature, the flow and the pressure of fluid at the inlet of the recharging well;
a temperature sensor disposed in the reservoir;
the second pressure gauge, the second flowmeter and the second thermometer are sequentially arranged at the outlet of the production well from top to bottom and are respectively used for measuring the pressure, the flow and the temperature of the fluid at the outlet of the production well;
the displacement recorder and the overlying pressure gauge are arranged on the overlying cover plate and are respectively used for monitoring the displacement and the pressure of the overlying cover plate.
8. A geothermal reservoir stimulation test system for unconsolidated sandstone rock according to claim 3 wherein the first pump body is a constant-speed constant-pressure injection pump.
9. A geothermal reservoir stimulation test system for unconsolidated sandstone rock according to claim 3 wherein the second pump is a constant speed and pressure water pump.
10. A geothermal reservoir stimulation test system for unconsolidated sandstone rock according to claim 5 wherein the third pump is a constant pressure hydraulic pump.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114994118A (en) * | 2022-08-03 | 2022-09-02 | 中国煤炭地质总局勘查研究总院 | Experimental device for be used for studying geology geothermal energy utilization |
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| US20190128068A1 (en) * | 2016-04-01 | 2019-05-02 | Board Of Regents Of The Nevada System Of Higher Education, On Behalf Of The University Of Nevada | Systems and methods for enhancing energy extraction from geothermal wells |
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Application publication date: 20210928 |