CN111322046A - Sandstone thermal storage geothermal tail water efficient recharge method based on simulation - Google Patents
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 73
- 238000004088 simulation Methods 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000005516 engineering process Methods 0.000 claims abstract description 43
- 238000001914 filtration Methods 0.000 claims abstract description 20
- 238000012544 monitoring process Methods 0.000 claims abstract description 20
- 238000000926 separation method Methods 0.000 claims abstract description 20
- 238000007789 sealing Methods 0.000 claims abstract description 11
- 238000012545 processing Methods 0.000 claims abstract description 8
- 238000006243 chemical reaction Methods 0.000 claims abstract description 7
- 230000005540 biological transmission Effects 0.000 claims abstract description 5
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 5
- 230000007797 corrosion Effects 0.000 claims abstract description 5
- 238000005260 corrosion Methods 0.000 claims abstract description 5
- 239000007788 liquid Substances 0.000 claims description 24
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 19
- 239000004576 sand Substances 0.000 claims description 13
- 238000005553 drilling Methods 0.000 claims description 6
- 239000012065 filter cake Substances 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 6
- 238000005406 washing Methods 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 238000005338 heat storage Methods 0.000 claims description 4
- 238000005065 mining Methods 0.000 claims description 4
- 239000004568 cement Substances 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 239000012530 fluid Substances 0.000 claims description 3
- 239000011521 glass Substances 0.000 claims description 3
- 238000013178 mathematical model Methods 0.000 claims description 3
- 238000004064 recycling Methods 0.000 claims description 3
- 239000002893 slag Substances 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 238000012795 verification Methods 0.000 claims description 3
- 230000000007 visual effect Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 5
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033558 biomineral tissue development Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
- 238000003809 water extraction Methods 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/30—Specific pattern of wells, e.g. optimising the spacing of wells
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/34—Arrangements for separating materials produced by the well
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24T—GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
- F24T10/00—Geothermal collectors
- F24T10/20—Geothermal collectors using underground water as working fluid; using working fluid injected directly into the ground, e.g. using injection wells and recovery wells
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
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- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Geochemistry & Mineralogy (AREA)
- Fluid Mechanics (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Physics & Mathematics (AREA)
- Hydrology & Water Resources (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
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- Combustion & Propulsion (AREA)
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- General Engineering & Computer Science (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
Abstract
The invention provides a sandstone thermal storage geothermal tail water efficient recharge method based on simulation, wherein the recharge method comprises a well arrangement technology, an innovative well formation technology, an efficient water-gas separation technology, an accurate water quality treatment technology, a well mouth multifunctional conversion technology and a data monitoring and acquisition technology based on simulation; has the advantages that: the invention is comprehensively designed from the aspects of well arrangement, well formation, water-gas separation, water quality treatment, multifunctional well mouth, data monitoring and acquisition, the produced geothermal water is completely recharged to the corresponding recharging well in the same layer after being filtered by the cascade utilization system, the recharging effect is good, and the recharging efficiency is high; the water-gas separation effect is good, and the safety of subsequent engineering is ensured; the filtering precision is high, and the problem of blockage in the process of recharging the sandstone thermal storage geothermal tail water is solved; the well mouth has high sealing performance, prevents pipeline corrosion caused by air suction, and automatically performs exhaust treatment; the system has high automation degree of control and monitoring, realizes remote data transmission and processing, and is safe and stable in operation.
Description
Technical Field
The invention relates to the field of geothermal tail water, in particular to a sandstone thermal storage geothermal tail water efficient recharge method based on simulation.
Background
In recent years, China vigorously promotes ecological civilization construction, energy structures are continuously adjusted and optimized, and deep well geothermal technology becomes a new emerging energy industry. Deep well geothermal heating projects are increasing continuously, but most of geothermal well heating tail water is directly discharged into urban sewers, so that geothermal resources are wasted, the mineralization degree of geothermal water is high, the geothermal water is discharged into surface water, environmental pollution is easily caused, and the geothermal water is only taken for a long time without being filled, so that the ground is easily subjected to overall settlement.
At present, recharging of geothermal tail water is an important problem for restricting development and utilization of geothermal resources in China, and parameters such as porosity and permeability of a reservoir layer can be changed due to the influence of water sensitivity, speed sensitivity and the like in the process of exploitation, so that the seepage capability of the reservoir layer is reduced. How to ensure that the heat production capacity and the exploitation condition of a reservoir are maintained 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 energy at present.
Geothermal tail water recharge is mainly divided into karst fracture type hot stored tail water recharge and clastic rock pore type hot stored tail water recharge in China. The karst fracture type hot storage tail water recharge effect is generally good, and the clastic rock pore type hot storage tail water recharge faces the problems of high formation pressure, hot storage blockage, sand production and the like.
Domestic research on geothermal recharge is only scattered and is not enough for a system. Moreover, most of units mainly develop and apply instruments and equipment, and do not develop system research from underground geothermal geological features, above-ground equipment configuration and geothermal mining and grouting well pattern layout aiming at sandstone thermal storage.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provides a simulation-based sandstone thermal storage geothermal tail water efficient recharge method.
The new technical scheme of the invention is as follows: a sandstone thermal storage geothermal tail water efficient recharge method based on simulation comprises a well arrangement technology, an innovative well forming technology, an efficient water-gas separation technology, an accurate water quality processing technology, a well mouth multifunctional conversion technology and a data monitoring and acquisition technology based on simulation, and the recharge method comprises the following steps:
1) well spacing technology based on simulation: establishing a geothermal geological concept model, determining a model boundary condition, establishing a mathematical model, subdividing space and time, determining a simulation period and a prediction period, and performing simulation verification; analyzing the heat storage seepage capacity by using an actual model according to the heating area and combining the water yield of a single well, and determining the mining and irrigating proportion and the well spacing scheme;
2) the innovative well forming technology comprises the steps that a whole well adopts a two-opening well forming structure, wherein a drill bit with the diameter of 444.5mm is used for drilling to 400m for first exploitation, an oil casing with the diameter of 339.7 × 9.65.65 mm is put in for second exploitation, a drill bit with the diameter of 311mm is used for drilling through a target layer to form a well, a 244.5 × 8.94.94 mm oil casing is put on the top of a target reservoir layer from 400m to 400m and comprises a 300m all-welded stainless steel wire-wound screen pipe, a hanger is installed at the position of 400m and is put in a 244.5mm casing pipe, the casing pipe comprises two outer casing packers and a blind plate, after the casing pipe is put in, the well is fixed at the position of the casing pipe from the upper part of a main thermal reservoir layer to 400m, cement returns to the position of 400m, the target thermal reservoir layer is completed by using the screen pipe, water is sealed by;
3) the high-efficiency water-gas separation technology comprises the following steps: after geothermal water reaches a ground machine room through a geothermal exploitation well, sand removal and gas separation are carried out through a water-gas separation device, the water-gas separation device comprises an exhaust port, a tank body with a built-in rotary blade, a geothermal water inlet, a pressure transmitter, a frequency converter with a control system, a magnetic column-turning liquid level meter, a sand bag and a sand valve, the magnetic column-turning liquid level meter and a liquid level transmitter are installed outside the tank body, the magnetic column-turning liquid level meter observes the water level inside the tank body, the liquid level transmitter provides a signal for the frequency converter, and the liquid level transmitter adjusts the water quantity of a geothermal water pump through the frequency converter; the gravel stored in the sand bag is periodically removed manually;
4) an accurate water quality treatment technology: the geothermal water enters a diatomite intelligent visual filtering system, the filtering system comprises a precoating tank, a slag discharging tank, a clear liquid tank, a bottom valve, an exhaust valve, an overflow valve, a circulating valve and a residual liquid return valve, the filtering system comprises filtering, precoating filtering, filter cake recycling and filter cake washing, the running state of each program is observed by a sight glass, and particles with the particle size of more than 1 mu m in the geothermal fluid are removed through a filter aid;
5) the well head multifunctional conversion technology comprises the following steps: geothermal water enters a geothermal cascade utilization system, and tail water is utilized by heat exchange and returned to the recharge well; the recharging wellhead is additionally provided with a wellhead sealing device, the wellhead sealing device is a four-way wellhead device, a flange and a ball valve are arranged on the wellhead sealing device around an oil pipe in the middle of the wellhead, and the opening and closing of the flange and the ball valve in different modes realize different functions; an oil pipe is hung at the wellhead, when the recharge quantity is reduced, a high-pressure fan is used for gas lift well washing, and a valve device is arranged on a gas lift drainage pipeline to control the pressure of the wellhead; a bypass pipeline and a valve are arranged at the well mouth, and the recharging pipeline is flushed through the bypass before geothermal tail water is recharged; the closed system prevents corrosion of the pipeline due to air intake;
6) data monitoring and collection technology: the recharging method is controlled and monitored by a PLC cabinet, and comprises the control and monitoring of the water temperature and water quantity of the production well and the recharging well, the control and monitoring of a filtering system, the real-time monitoring of the pressure of a system pipeline, and the remote transmission and processing of data.
The filter aid is diatomite.
The invention has the beneficial effects that: the invention is comprehensively designed from the aspects of well arrangement, well formation, water-gas separation, water quality treatment, multifunctional well mouth, data monitoring and acquisition, the produced geothermal water is completely recharged to the corresponding recharging well in the same layer after being filtered by the cascade utilization system, the recharging effect is good, and the recharging efficiency is high; the water-gas separation effect is good, and the safety of subsequent engineering is ensured; the filtering precision is high, and the problem of blockage in the process of recharging the sandstone thermal storage geothermal tail water is solved; the well mouth has high sealing performance, prevents pipeline corrosion caused by air suction, and automatically performs exhaust treatment; the system has high automation degree of control and monitoring, realizes remote data transmission and processing, and is safe and stable in operation.
Detailed Description
A sandstone thermal storage geothermal tail water efficient recharge method based on simulation comprises a well arrangement technology, an innovative well forming technology, an efficient water-gas separation technology, an accurate water quality processing technology, a well mouth multifunctional conversion technology and a data monitoring and acquisition technology based on simulation, and the recharge method comprises the following steps:
1) well spacing technology based on simulation: establishing a geothermal geological concept model, determining a model boundary condition, establishing a mathematical model, subdividing space and time, determining a simulation period and a prediction period, and performing simulation verification; analyzing the heat storage seepage capacity by using an actual model according to the heating area and combining the water yield of a single well, and determining the mining and irrigating proportion and the well spacing scheme;
2) the innovative well forming technology comprises the steps that a whole well adopts a two-opening well forming structure, wherein a drill bit with the diameter of 444.5mm is used for drilling to 400m for first exploitation, an oil casing with the diameter of 339.7 × 9.65.65 mm is put in for second exploitation, a drill bit with the diameter of 311mm is used for drilling through a target layer to form a well, a 244.5 × 8.94.94 mm oil casing is put on the top of a target reservoir layer from 400m to 400m and comprises a 300m all-welded stainless steel wire-wound screen pipe, a hanger is installed at the position of 400m and is put in a 244.5mm casing pipe, the casing pipe comprises two outer casing packers and a blind plate, after the casing pipe is put in, the well is fixed at the position of the casing pipe from the upper part of a main thermal reservoir layer to 400m, cement returns to the position of 400m, the target thermal reservoir layer is completed by using the screen pipe, water is sealed by;
3) the high-efficiency water-gas separation technology comprises the following steps: after geothermal water reaches a ground machine room through a geothermal exploitation well, sand removal and gas separation are carried out through a water-gas separation device, the water-gas separation device comprises an exhaust port, a tank body with a built-in rotary blade, a geothermal water inlet, a pressure transmitter, a frequency converter with a control system, a magnetic column-turning liquid level meter, a sand bag and a sand valve, the magnetic column-turning liquid level meter and a liquid level transmitter are installed outside the tank body, the magnetic column-turning liquid level meter observes the water level inside the tank body, the liquid level transmitter provides a signal for the frequency converter, and the liquid level transmitter adjusts the water quantity of a geothermal water pump through the frequency converter; the gravel stored in the sand bag is periodically removed manually;
4) an accurate water quality treatment technology: the geothermal water enters a diatomite intelligent visual filtering system, the filtering system comprises a precoating tank, a slag discharging tank, a clear liquid tank, a bottom valve, an exhaust valve, an overflow valve, a circulating valve and a residual liquid return valve, the filtering system comprises filtering, precoating filtering, filter cake recycling and filter cake washing, the running state of each program is observed by a sight glass, and particles with the particle size of more than 1 mu m in the geothermal fluid are removed through a filter aid;
5) the well head multifunctional conversion technology comprises the following steps: geothermal water enters a geothermal cascade utilization system, and tail water is utilized by heat exchange and returned to the recharge well; the recharging wellhead is additionally provided with a wellhead sealing device, the wellhead sealing device is a four-way wellhead device, a flange and a ball valve are arranged on the wellhead sealing device around an oil pipe in the middle of the wellhead, and the opening and closing of the flange and the ball valve in different modes realize different functions; an oil pipe is hung at the wellhead, when the recharge quantity is reduced, a high-pressure fan is used for gas lift well washing, and a valve device is arranged on a gas lift drainage pipeline to control the pressure of the wellhead; a bypass pipeline and a valve are arranged at the well mouth, and the recharging pipeline is flushed through the bypass before geothermal tail water is recharged; the closed system prevents corrosion of the pipeline due to air intake;
6) data monitoring and collection technology: the recharging method is controlled and monitored by a PLC cabinet, and comprises the control and monitoring of the water temperature and water quantity of the production well and the recharging well, the control and monitoring of a filtering system, the real-time monitoring of the pressure of a system pipeline, and the remote transmission and processing of data.
The filter aid is diatomite.
Claims (2)
1. A sandstone thermal storage geothermal tail water efficient recharge method based on simulation comprises a well arrangement technology, an innovative well formation technology, an efficient water-gas separation technology, an accurate water quality processing technology, a well mouth multifunctional conversion technology and a data monitoring and acquisition technology based on simulation, and is characterized in that:
the recharging method comprises the following steps:
1) well spacing technology based on simulation: establishing a geothermal geological concept model, determining a model boundary condition, establishing a mathematical model, subdividing space and time, determining a simulation period and a prediction period, and performing simulation verification; analyzing the heat storage seepage capacity by using an actual model according to the heating area and combining the water yield of a single well, and determining the mining and irrigating proportion and the well spacing scheme;
2) the innovative well forming technology comprises the steps that a whole well adopts a two-opening well forming structure, wherein a drill bit with the diameter of 444.5mm is used for drilling to 400m for first exploitation, an oil casing with the diameter of 339.7 × 9.65.65 mm is put in for second exploitation, a drill bit with the diameter of 311mm is used for drilling through a target layer to form a well, a 244.5 × 8.94.94 mm oil casing is put on the top of a target reservoir layer from 400m to 400m and comprises a 300m all-welded stainless steel wire-wound screen pipe, a hanger is installed at the position of 400m and is put in a 244.5mm casing pipe, the casing pipe comprises two outer casing packers and a blind plate, after the casing pipe is put in, the well is fixed at the position of the casing pipe from the upper part of a main thermal reservoir layer to 400m, cement returns to the position of 400m, the target thermal reservoir layer is completed by using the screen pipe, water is sealed by;
3) the high-efficiency water-gas separation technology comprises the following steps: after geothermal water reaches a ground machine room through a geothermal exploitation well, sand removal and gas separation are carried out through a water-gas separation device, the water-gas separation device comprises an exhaust port, a tank body with a built-in rotary blade, a geothermal water inlet, a pressure transmitter, a frequency converter with a control system, a magnetic column-turning liquid level meter, a sand bag and a sand valve, the magnetic column-turning liquid level meter and a liquid level transmitter are installed outside the tank body, the magnetic column-turning liquid level meter observes the water level inside the tank body, the liquid level transmitter provides a signal for the frequency converter, and the liquid level transmitter adjusts the water quantity of a geothermal water pump through the frequency converter; the gravel stored in the sand bag is periodically removed manually;
4) an accurate water quality treatment technology: the geothermal water enters a diatomite intelligent visual filtering system, the filtering system comprises a precoating tank, a slag discharging tank, a clear liquid tank, a bottom valve, an exhaust valve, an overflow valve, a circulating valve and a residual liquid return valve, the filtering system comprises filtering, precoating filtering, filter cake recycling and filter cake washing, the running state of each program is observed by a sight glass, and particles with the particle size of more than 1 mu m in the geothermal fluid are removed through a filter aid;
5) the well head multifunctional conversion technology comprises the following steps: geothermal water enters a geothermal cascade utilization system, and tail water is utilized by heat exchange and returned to the recharge well; the recharging wellhead is additionally provided with a wellhead sealing device, the wellhead sealing device is a four-way wellhead device, a flange and a ball valve are arranged on the wellhead sealing device around an oil pipe in the middle of the wellhead, and the opening and closing of the flange and the ball valve in different modes realize different functions; an oil pipe is hung at the wellhead, when the recharge quantity is reduced, a high-pressure fan is used for gas lift well washing, and a valve device is arranged on a gas lift drainage pipeline to control the pressure of the wellhead; a bypass pipeline and a valve are arranged at the well mouth, and the recharging pipeline is flushed through the bypass before geothermal tail water is recharged; the closed system prevents corrosion of the pipeline due to air intake;
6) data monitoring and collection technology: the recharging method is controlled and monitored by a PLC cabinet, and comprises the control and monitoring of the water temperature and water quantity of the production well and the recharging well, the control and monitoring of a filtering system, the real-time monitoring of the pressure of a system pipeline, and the remote transmission and processing of data.
2. The sandstone heat storage geothermal tail water efficient recharge method based on simulation of claim 1, which is characterized in that: the filter aid is diatomite.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2019112215295 | 2019-12-03 | ||
| CN201911221529.5A CN110905469A (en) | 2019-12-03 | 2019-12-03 | Sandstone thermal storage geothermal tail water efficient recharge method based on simulation |
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| CN202010395985.8A Pending CN111322046A (en) | 2019-12-03 | 2020-05-12 | Sandstone thermal storage geothermal tail water efficient recharge method based on simulation |
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| CN113060851A (en) * | 2021-04-01 | 2021-07-02 | 重庆大学 | Geothermal recharge filtering system and application thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113216944B (en) * | 2021-04-27 | 2022-10-18 | 中国地质科学院水文地质环境地质研究所 | Device and method for researching influence factors of deep bed rock recharge |
| CN113776210B (en) * | 2021-08-23 | 2023-09-15 | 常州大学 | Novel recharging method for improving geothermal recharging efficiency of deep sandstone |
| CN114412416A (en) * | 2022-03-09 | 2022-04-29 | 山东省鲁南地质工程勘察院(山东省地质矿产勘查开发局第二地质大队) | Heat reservoir and conveying pipeline pump-lifting-free descaling device and using method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113060851A (en) * | 2021-04-01 | 2021-07-02 | 重庆大学 | Geothermal recharge filtering system and application thereof |
| CN113060851B (en) * | 2021-04-01 | 2022-06-07 | 重庆大学 | Geothermal recharge filtering system and application thereof |
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| Publication number | Publication date |
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| CN110905469A (en) | 2020-03-24 |
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Application publication date: 20200623 |