CN114482920B - Novel geothermal well reconstruction method - Google Patents
Novel geothermal well reconstruction method Download PDFInfo
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- CN114482920B CN114482920B CN202111563248.5A CN202111563248A CN114482920B CN 114482920 B CN114482920 B CN 114482920B CN 202111563248 A CN202111563248 A CN 202111563248A CN 114482920 B CN114482920 B CN 114482920B
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
- E21B33/138—Plastering the borehole wall; Injecting into the formation
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
- E21B47/07—Temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24T—GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
- F24T10/00—Geothermal collectors
- F24T10/10—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground
- F24T10/13—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground using tube assemblies suitable for insertion into boreholes in the ground, e.g. geothermal probes
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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
Abstract
The invention discloses a novel geothermal well reconstruction method, which is suitable for the technical field of geothermal exploitation, and comprises a secondary well cementation geothermal well reconstruction method, wherein the waste geothermal well is technically reconstructed by a secondary well cementation and central pipe descending technical means, and the waste geothermal well is technically reconstructed by a U-shaped pipe direct descending technical means, so that the problems of waste geothermal well and waste geothermal well of underground hot water extraction due to environmental protection are solved, the aim of changing waste into valuables is fulfilled, the clean and efficient utilization of geothermal resources is realized, the service life of the geothermal well is prolonged, and the economic benefit is improved.
Description
Technical Field
The invention belongs to the technical field of geothermal exploitation, and particularly relates to a novel geothermal well reconstruction method.
Background
For medium-deep medium-low temperature water geothermal resources, the existing geothermal exploitation mode in China is to extract underground hot water and exchange the heat energy of the hot water in a heat exchange mode so as to achieve the purpose of heat extraction. The large amount of discharge of the geothermal heating tail water not only causes resource waste and causes continuous reduction of heat storage pressure and continuous increase of water pumping energy consumption, but also causes water and soil pollution to the periphery; meanwhile, geological disasters such as ground subsidence and ground cracks are aggravated. If the tail water recharging is carried out, the difficulty of the tail water recharging is high because of the complexity of sandstone thermal storage geological conditions and huge reservoir pressure, the thermal reservoir is easy to be blocked, the recharging quantity is fast attenuated, and the tail water recharging cost is high; meanwhile, the tail water recharging can also cause reservoir pollution, so that a deep groundwater system is integrated in a polluted manner, and an ecological disaster is formed.
The low-temperature water-free geothermal resource in the middle and deep layers is generally buried below 2000 meters, the drilling cost is high, and meanwhile, the existing technology of taking heat without taking water has low heat efficiency which is only one tenth of that of the traditional geothermal heat taking technology, so that the technology of taking heat without taking water is difficult to popularize.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a novel geothermal well reconstruction method.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a novel geothermal well reconstruction method comprises the following steps:
flushing, namely washing out sediment in the geothermal well, dredging the thermal reservoir, and increasing the permeability of the thermal reservoir;
and plugging the stratum by using a well cementation material, blocking the material exchange between the thermal reservoir fluid and the fluid in the shaft, and carrying out heat exchange between the thermal reservoir fluid and the fluid through the shaft.
Placing a central pipe to the bottom of the well, placing a temperature measuring optical fiber in an annular space formed by the central pipe and a production layer sleeve, monitoring the temperature from 100 meters to each depth of the bottom of the well, and adjusting the extraction flow according to the change of the bottom temperature to ensure that the backwater temperature is higher than 0 ℃;
the annular space formed by the surface sleeve is put into the buried pipe.
Preferably, the central tube is a water pumping port for pumping fluid in the shaft, pumping the fluid to the heat exchange station, conveying the fluid to a client by the heat exchange station, reducing the water temperature through heat exchange, and injecting backwater into the shaft through a gap between the shaft and the central tube.
Preferably, the heat supply and heat exchange pipe network transfers heat to the user pipe network, the hot water flows through the water collector, the water is pumped to each heating unit in a partitioning mode according to heating requirements, the backwater flows through the filter for rust removal and scale removal, and the backwater enters the cascade heat supply and heat exchange pipe network again for heat collection and circulation.
Preferably, when a heating peak comes, the ground pipe buried ground source heat pump heat exchange system is started to serve as a supplementary heat source;
and in the period of high temperature and summer heat in summer, the heat exchange system of the ground source heat pump of the buried pipe is started to be used as a supplementary cold source.
Preferably, the well cementation material adopts G-grade cement, 7.5% of graphite, 3% of iron powder, a water reducing agent and a defoaming agent are added, and mortar preparation is carried out according to a water-solid ratio value of 0.44; wherein, the thermal conductivity coefficient of the well cementation material is 1.8838W/(m.K), the fluidity is 24cm, and the 48h compressive strength is 14.78MPa.
Preferably, when the backwater temperature is too low, the extraction flow is reduced; the temperature of backwater is less than or equal to 0 ℃, and the working unit of the heat exchange system is stopped; the extraction flow regulation range is 0-30 m 3 And/h, the common backwater temperature is 5-10 ℃,
preferably, the buried pipe and the central pipe are PEC heat insulation pipes, and technical parameters of the PEC heat insulation pipes are as follows: the heat conductivity coefficient is less than 0.18W/(m.K), the tensile yield strength is more than 90MPa, the applicable temperature is between 20 ℃ below zero and 120 ℃, and the density is 1.22 multiplied by 103kg/m < 3 >. The inner diameter is more than or equal to 90cm, and the wall thickness is more than or equal to 10cm.
A novel geothermal well reconstruction method comprises the following steps:
flushing, namely washing out sediment in the geothermal well, dredging the thermal reservoir and increasing the permeability of the thermal reservoir.
Two groups of deep and shallow U-shaped pipes are arranged in the in-situ heat well, the deep U-shaped pipes are metal U-shaped pipes which are arranged at the bottom of the geothermal reservoir, and the shallow U-shaped buried pipes are PEC heat preservation pipes which are arranged at the bottom of the surface layer casing;
the water level measuring device and the temperature measuring optical fiber are arranged from the wellhead to monitor the water temperature and the water level of the deep part of the geothermal well in real time;
fluid in the pipe is pumped to the heat exchange station by the water pumping port, the fluid is conveyed to a client by the heat exchange station, the water temperature is reduced through heat exchange, and backwater is injected back into the U-shaped pipe by the water return port.
Preferably, the heat supply and heat exchange pipe network transfers heat to the user pipe network, the hot water flows through the water collector, the water is pumped to each heating unit in a partitioning mode according to heating requirements, the backwater flows through the filter for rust removal and scale removal, and the backwater enters the cascade heat supply and heat exchange pipe network again for heat collection, and the tap water pipeline provides circulating water in a circulating mode.
Preferably, the diameter of the U-shaped pipe is larger than 90mm; the metal U-shaped tube adopts an aluminum alloy tube; and controlling the flow according to the bottom hole temperature.
In summary, due to the adoption of the technical scheme, the beneficial effects of the invention are as follows:
the invention discloses a secondary well cementation geothermal well reconstruction method, which is characterized in that the waste geothermal well is technically reconstructed by secondary well cementation and central pipe descending technical means, so that the waste geothermal well and the waste problem of the traditional extraction geothermal well of underground hot water due to environmental protection are solved, the aim of changing waste into valuables is achieved, the clean and efficient utilization of geothermal resources is realized, the service life of the geothermal well is prolonged, and the economic benefit is improved;
the invention also discloses a method for reforming the U-shaped pipe geothermal well, which is used for carrying out technical reforming on the waste geothermal well by technical means such as directly discharging the metal U-shaped pipe, solving the waste problem of the waste geothermal well and the waste problem of the traditional extraction of the geothermal well of the underground hot water due to the environmental protection problem, achieving the aim of changing waste into valuables, realizing clean and efficient utilization of geothermal resources, prolonging the service life of the geothermal well and improving the economic benefit of the geothermal well.
Drawings
FIG. 1 is a flow chart of a method for reforming a secondary well cementation geothermal well in the invention;
FIG. 2 is a flow chart of a method for reforming a U-shaped pipe geothermal well in the invention.
Detailed Description
The following is a detailed description of a new geothermal well modification method according to the present invention with reference to fig. 1-2. The novel geothermal well modification method of the present invention is not limited to the description of the following embodiments.
Example 1:
the embodiment provides a specific implementation manner of a novel geothermal well reconstruction method, as shown in fig. 1, including the following steps:
flushing, namely washing out sediment in the geothermal well, dredging the thermal reservoir, and increasing the permeability of the thermal reservoir;
and plugging the stratum by using a well cementation material, blocking the material exchange between the thermal reservoir fluid and the fluid in the shaft, and carrying out heat exchange between the thermal reservoir fluid and the fluid through the shaft.
Placing a central pipe to the bottom of the well, placing a temperature measuring optical fiber in an annular space formed by the central pipe and a production layer sleeve, monitoring the temperature from 100 meters to each depth of the bottom of the well, and adjusting the extraction flow according to the change of the bottom temperature to ensure that the backwater temperature is higher than 0 ℃;
the annular space formed by the surface sleeve is put into the buried pipe.
Further, the central tube is a water pumping port for pumping fluid in the shaft, pumping the fluid to the heat exchange station, conveying the fluid to a client by the heat exchange station, reducing the temperature of water through heat exchange, and injecting backwater into the shaft through a gap between the shaft and the central tube.
Further, the heat supply and heat exchange pipe network transfers heat to the user pipe network, the hot water flows through the water collector, the water is pumped to each heating unit in a partitioning mode according to heating requirements, the backwater flows through the filter for rust removal and scale removal, and the backwater enters the cascade heat supply and heat exchange pipe network again for heat collection and circulation.
Further, when a heating peak comes, the heat exchange system of the ground pipe buried ground source heat pump is started to serve as a supplementary heat source;
and in the period of high temperature and summer heat in summer, the heat exchange system of the ground source heat pump of the buried pipe is started to be used as a supplementary cold source.
Further, the well cementation material adopts G-grade cement, 7.5 percent of graphite, 3 percent of iron powder, a water reducing agent and a defoaming agent are added, and mortar is prepared according to a water-solid ratio value of 0.44; wherein, the thermal conductivity coefficient of the well cementation material is 1.8838W/(m.K), the fluidity is 24cm, and the 48h compressive strength is 14.78MPa.
Further, when the temperature of the backwater is too low, the extraction flow is reduced; the temperature of backwater is less than or equal to 0 ℃, and the working unit of the heat exchange system is stopped; the extraction flow regulation range is 0-30 m 3 And/h, the common backwater temperature is 5-10 ℃,
further, the buried pipe and the central pipe are PEC heat-insulating pipes, and technical parameters of the PEC heat-insulating pipes are as follows: the heat conductivity coefficient is less than 0.18W/(m.K), the tensile yield strength is more than 90MPa, the applicable temperature is between 20 ℃ below zero and 120 ℃, and the density is 1.22 multiplied by 103kg/m < 3 >. The inner diameter is more than or equal to 90cm, and the wall thickness is more than or equal to 10cm.
By adopting the technical means, the method comprises the following steps:
the method for reforming the geothermal well with the secondary well cementation comprises the steps of washing sediment in the geothermal well by flushing the well, keeping the bottom of the well clean, dredging a thermal reservoir, and increasing the permeability of the thermal reservoir; through the workover, with geothermal well heat storage layer section with cement shutoff, block the connection between thermal reservoir and the pit shaft, make the pit shaft become a confined space, the heat store is through pit shaft heat conduction with the fluid of heat energy conduction for the pit shaft, flow fluid heating, the hot water of bottom of the well is extracted to ground through the center tube, get into the heat exchange station, carry the customer by the heat exchange station, through the temperature reduction of heat exchange water, the return water is annotated back in the pit shaft by between pit shaft and the center tube, through secondary well cementation, lower center tube technical means, the technological transformation is carried out to the geothermal well of abandonment, solve the geothermal well abandonment of abandonment and because of the traditional geothermal well abandonment problem of extracting geothermal water of environmental protection problem, reach the purpose of changing waste into valuables, realize the clean high-efficient utilization of geothermal resource, the service life of geothermal well is prolonged, improve its economic benefits.
Example 2:
the embodiment provides a specific implementation manner of a novel geothermal well reconstruction method, as shown in fig. 2, including the following steps:
flushing, namely washing out sediment in the geothermal well, dredging the thermal reservoir and increasing the permeability of the thermal reservoir.
Two groups of deep and shallow U-shaped pipes are arranged in the in-situ heat well, the deep U-shaped pipes are metal U-shaped pipes which are arranged at the bottom of the geothermal reservoir, and the shallow U-shaped buried pipes are PEC heat preservation pipes which are arranged at the bottom of the surface layer casing;
the water level measuring device and the temperature measuring optical fiber are arranged from the wellhead to monitor the water temperature and the water level of the deep part of the geothermal well in real time;
fluid in the pipe is pumped to the heat exchange station by the water pumping port, the fluid is conveyed to a client by the heat exchange station, the water temperature is reduced through heat exchange, and backwater is injected back into the U-shaped pipe by the water return port.
Further, the heat supply and heat exchange pipe network transfers heat to the user pipe network, hot water flows through the water collector, is pumped to each heating unit in a partitioning mode according to heating requirements, and backwater flows through the filter to remove rust and scale, enters the cascade heat supply and heat exchange pipe network again to take heat, and is circulated and reciprocated, and circulating water is provided by the tap water pipeline.
Further, the diameter of the U-shaped pipe is larger than 90mm; the metal U-shaped tube adopts an aluminum alloy tube; and controlling the flow according to the bottom hole temperature.
By adopting the technical means, the method comprises the following steps:
the U-shaped pipe geothermal well reconstruction method is characterized in that sediment in the geothermal well is washed out through well flushing, so that the bottom of the well is kept clean, meanwhile, a thermal reservoir is dredged, and the permeability of the thermal reservoir is increased; and the well repairing process is not performed, and the metal U-shaped pipe is sealed in the geothermal well, and does not exchange substances with the thermal storage fluid. The U-shaped pipe needs to be arranged at the bottom of the thermal reservoir as far as possible, fluid in the metal U-shaped pipe is heated through heat conduction between the U-shaped pipe and the thermal reservoir body, fluid in the pipe is pumped to a heat exchange station from one end of the metal U-shaped pipe, the fluid is conveyed to a client from the heat exchange station, the temperature of water after heat exchange is reduced, backwater is injected back into the U-shaped pipe from the other end of the U-shaped pipe, technical transformation is carried out on a waste geothermal well through technical means such as directly feeding the metal U-shaped pipe, the waste geothermal well and the waste problem of the conventional underground geothermal well pumping due to the environmental protection problem are solved, the aim of changing waste into valuables is fulfilled, the clean and efficient utilization of geothermal resources is realized, the service life of the geothermal well is prolonged, and the economic benefit of the geothermal well is improved.
The foregoing is a further detailed description of the invention in connection with the preferred embodiments, and it is not intended that the invention be limited to the specific embodiments described. It will be apparent to those skilled in the art that several simple deductions or substitutions may be made without departing from the spirit of the invention, and these should be considered to be within the scope of the invention.
Claims (1)
1. The novel geothermal well reconstruction method is characterized by comprising the following steps of:
flushing, namely washing out sediment in the geothermal well, dredging the thermal reservoir, and increasing the permeability of the thermal reservoir;
plugging a stratum by using a well cementation material, blocking the exchange of substances between the fluid in the thermal reservoir and the fluid in the shaft, and exchanging heat between the fluid in the thermal reservoir and the fluid in the shaft through the shaft;
placing a central pipe to the bottom of the well, placing a temperature measuring optical fiber in an annular space formed by the central pipe and a production layer sleeve, monitoring the temperature from 100 meters to each depth of the bottom of the well, and adjusting the extraction flow according to the change of the bottom temperature to ensure that the backwater temperature is higher than 0 ℃;
placing an annular space formed by the surface layer sleeve into a buried pipe;
the central pipe is a water pumping port for pumping fluid in the shaft, pumping the fluid to the heat exchange station, conveying the fluid to a client from the heat exchange station, reducing the temperature of water through heat exchange, and injecting backwater into the shaft from a gap between the shaft and the central pipe;
the heat supply and exchange pipe network transfers heat to the user pipe network, hot water flows through the water collector and is pumped to each heating unit in a partitioning way according to heating requirements, backwater flows through the filter for rust removal and descaling, and enters the cascade heat supply and exchange pipe network again for heat collection and circulation;
when a heating peak comes, a ground pipe buried ground source heat pump heat exchange system is started to serve as a supplementary heat source;
in the period of high temperature and summer heat in summer, a ground pipe buried ground source heat pump heat exchange system is started to serve as a supplementary cold source;
the well cementation material adopts G-grade cement, 7.5% of graphite, 3% of iron powder, a water reducing agent and a defoaming agent are added, and mortar is prepared according to a water-solid ratio value of 0.44; wherein, the thermal conductivity coefficient of the well cementation material is 1.8838W/(m.K), the fluidity is 24cm, and the 48h compressive strength is 14.78MPa;
when the temperature of the backwater is too low, the extraction flow is reduced; the temperature of backwater is less than or equal to 0 ℃, and the working unit of the heat exchange system is stopped; the extraction flow regulation range is 0-30 m 3 And/h, wherein the common backwater temperature is 5-10 ℃;
the buried pipe and the central pipe are PEC heat-insulating pipes, and the technical parameters of the PEC heat-insulating pipes are as follows: the heat conductivity coefficient is less than 0.18W/(m.K), the tensile yield strength is more than 90MPa, the applicable temperature is between 20 ℃ below zero and 120 ℃, and the density is 1.22 multiplied by 103kg/m 3 The method comprises the steps of carrying out a first treatment on the surface of the The inner diameter is more than or equal to 90cm, and the wall thickness is more than or equal to 10cm.
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| CN114482920A (en) | 2022-05-13 |
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