CN114813827A - Micro-thermal test device and method for determining thermophysical property parameters of aquifer - Google Patents
Micro-thermal test device and method for determining thermophysical property parameters of aquifer Download PDFInfo
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- CN114813827A CN114813827A CN202210440369.9A CN202210440369A CN114813827A CN 114813827 A CN114813827 A CN 114813827A CN 202210440369 A CN202210440369 A CN 202210440369A CN 114813827 A CN114813827 A CN 114813827A
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Abstract
The invention discloses a micro-thermal test device and a method for determining thermophysical parameters of an aquifer, wherein the micro-thermal test device comprises a computer control and data acquisition system, a hoisting lead, a motor power system, a rotating frame, a double-layer sleeve excitation device and a water pressure and temperature integrated sensing probe; the top of the double-layer sleeve excitation device is provided with a top plate cover, the motor power system is arranged on the top plate cover, and the edge of the top plate cover is provided with a water inlet valve port; the water pressure and temperature integrated sensing probe is arranged on the outer side wall of the double-layer sleeve excitation device; the computer control and data acquisition system is connected with the motor power system and the water pressure and temperature integrated sensing probe through hoisting wires; the motor power system is connected with the double-layer sleeve excitation device through the rotating frame, the side wall of the double-layer sleeve excitation device is provided with a penetration hole, and the rotating frame drives the double-layer sleeve excitation device to rotate under the driving of the motor power system so as to control the opening and closing of the penetration hole. The device has simple structure, is used for researching the thermophysical parameters of the aquifer, and has strong adaptability.
Description
Technical Field
The invention relates to a micro-thermal test device and method for determining thermophysical parameters of an aquifer, belonging to the technical field of micro-thermal tests.
Background
The development and utilization of green and renewable shallow geothermal energy can not only effectively relieve the problem of energy shortage, but also greatly reduce environmental pollution, and is a currently indispensable research project in China. At present, the most common technology for developing and utilizing shallow geothermal resources in China is a ground source heat pump, and two utilization modes of a ground pipe ground source heat pump and a ground water source heat pump are mainly adopted.
The problem of heat transfer of the aquifer is a very important research direction in the development and utilization of geothermal resources, and the thermophysical properties of the aquifer mainly comprise effective thermal conductivity, thermal conductivity of rock-soil mass, thermomechanical dispersion coefficient and thermal diffusivity. The effective heat conductivity coefficient plays a significant role in solving the heat transfer problem of the porous medium, and the accurate measurement of the heat conductivity coefficient by adopting a certain method has important theoretical value and practical engineering significance.
The heat conductivity coefficient measuring method which is most applied at present mainly comprises an indoor test method and a field thermal response method, wherein the indoor test method can change the structure, the water content and the like of the rock-soil body, and results in larger error, the field thermal response method is a test means which is mature and applied more at present, the test principle is that a certain heat source is given to the rock-soil body, the heat migration distribution is observed, and therefore the heat conductivity coefficient of the rock-soil body is deduced, and the method is an in-situ test which considers factors such as the internal geological structure and the water migration of the rock-soil body. At present, two main excitation modes of a heat source are provided, namely, a loop fluid is heated by a constant heat flow density method, and heating power is converted; and secondly, the temperature of the inlet of the buried pipe is kept constant by a constant water temperature method, and the change rule of the outlet temperature is recorded so as to obtain thermophysical parameters. The on-site thermal response method is more practical, the parameter obtaining precision is high, but the problems of long test period, complex operation of a test device and the like exist. Based on the research of the porous medium heat migration theory, the radial flow rule of the linear instantaneous micro heat source near the well is researched, and the thermophysical property parameters of the aquifer can be efficiently and accurately determined. However, few studies have been made on excitation devices for linear heat sources, particularly linear instantaneous micro heat sources, and no test device has been available which has stable excitation means and is easy to operate.
Disclosure of Invention
In order to overcome the defects in the prior art and realize the determination and research of the thermal physical property parameters of the aquifer, the invention provides the micro-thermal test device and the method for determining the thermal physical property parameters of the aquifer, which have the advantages of intelligent operation, wide application conditions, high test efficiency and convenient data acquisition, and is simple and easy to operate and good in stability.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a micro-thermal test device for determining the thermophysical parameters of an aquifer comprises a computer control and data acquisition system, a hoisting lead, a motor power system, a rotating frame, a double-layer sleeve excitation device and a water pressure and temperature integrated sensing probe;
the top of the double-layer sleeve excitation device is provided with a top plate cover, the motor power system is arranged on the top plate cover, and the edge of the top plate cover is provided with a water inlet valve port;
the water pressure and temperature integrated sensing probe is arranged on the outer side wall of the double-layer sleeve excitation device; the computer control and data acquisition system is connected with the motor power system and the water pressure and temperature integrated sensing probe through hoisting wires;
the motor power system is connected with the double-layer sleeve excitation device through the rotating frame, the side wall of the double-layer sleeve excitation device is provided with the penetration holes, the rotating frame drives the double-layer sleeve excitation device to rotate under the driving of the motor power system, the penetration holes can be rotated to be opened or closed, and when the penetration holes are closed, the water inlet valve port can be communicated to the inner side of the double-layer sleeve excitation device.
The computer control and data acquisition system is connected with the water pressure and temperature integrated sensing probe and the motor power system through the hoisting lead to control equipment and transmit and record test data, and the specific mode of connection and control of the computer control and data acquisition system can be realized by referring to the mature technology in the prior art.
The hoisting wire is responsible for hoisting and lowering the well and transmitting data of the device. The double-layer sleeve excitation device is responsible for the instant excitation of the linear heat source.
When the penetration hole is closed, the water inlet valve port can be communicated to the inner side of the double-layer sleeve excitation device, and when the penetration hole is closed, water can be injected into the inner side of the double-layer sleeve excitation device through the water inlet valve port. The water inlet valve port is connected with a hot water inlet pipe for water injection.
In order to simplify the structure and facilitate the operation, as a specific implementation scheme, the double-layer sleeve excitation device comprises an inner layer perforated pipe and an outer layer perforated pipe; the inner layer flower tube and the outer layer flower tube are both cylindrical, and the inner layer flower tube is arranged on the inner side of the outer layer flower tube and is adhered to the inner wall of the outer layer flower tube; the side wall of the inner layer perforated pipe is provided with an inner layer permeation hole, and the side wall of the outer layer perforated pipe is provided with an outer layer permeation hole; the motor power system is connected with the inner layer floral tube or the outer layer floral tube through the rotating frame, the rotating frame drives the inner layer floral tube or the outer layer floral tube to rotate under the driving of the motor power system, the motor power system can rotate until the inner layer permeation hole and the outer layer permeation hole are completely coincided (the permeation hole is opened at the moment) or the inner layer permeation hole and the outer layer permeation hole are not coincided (the permeation hole is closed at the moment), and when the permeation hole is closed, the water inlet valve port can be communicated to the inner side of the inner layer floral tube.
The inner layer flower pipe and the outer layer flower pipe are both cylindrical, and are good in roundness, high in strength and good in heat-insulating property.
In order to improve the excitation stability, a first upper hole is arranged on the top plate cover, the rotating frame is of a short cylinder structure with a top surface, the central position of the top surface of the rotating frame is connected with a rotating shaft of a motor power system, and a second upper hole and a water inlet hole communicated with a water inlet valve port are arranged on the top surface of the rotating frame; when the inner layer permeation hole and the outer layer permeation hole are completely superposed (at the moment, the permeation hole is opened), the first upper hole and the second upper hole are also completely superposed (at the moment, the upper hole is opened), at the moment, water in a well hole covers the first upper hole through a top plate and the second upper hole on the top surface of a rotating frame are both communicated with the inner side of the inner layer perforated pipe, and external water pressure can directly act on the top of the perforated pipe and can be used for controlling the external water pressure acting on the top of the perforated pipe; when the inner layer permeation hole and the outer layer permeation hole are not overlapped (the permeation holes are closed at the moment), the first upper hole and the second upper hole are not overlapped (the upper holes are closed at the moment), at the moment, the water inlet hole in the top surface of the rotating frame is communicated with the water inlet valve port, and water can be injected into the inner side of the inner layer flower tube through the water inlet valve port. That is, the top plate cover is also provided with permeable holes (upper holes) which can be opened and closed, and the opening and closing of the permeable holes are synchronous with the opening and closing of the permeable holes on the double-layer sleeve excitation device. Therefore, hot water can be stably excited, a heat source is stably dissipated, and when the water pressure in the well hole entering from the top cover plate is equal to the water pressure of the aquifer, a micro-thermal test under the condition of no seepage is formed; when the water pressure in the well hole entering from the top cover plate is greater than the water pressure of the aquifer, a micro-thermal test under the seepage condition is formed, so that different convection conditions and different excitation strength tests can be set.
Before the test, the inner and outer layers of permeation holes are staggered and closed, and the upper hole on the top plate cover is closed to form a closed waterproof cylindrical hollow pipe. During the test, hot water is injected into the inner side of the inner layer flower tube from the upper water inlet valve port to carry out the test; the hot water filling can not pollute the environment and underground water, and a linear heat source can also be simulated.
Preferably, the rotating frame is connected with the outer-layer perforated pipe, and the rotating frame drives the outer-layer perforated pipe to rotate under the driving of the motor power system. If the rotating frame is connected with the inner layer flower tube, water seepage or pollution between the inner layer flower tube and the outer layer flower tube cannot be avoided; and connect outer floral tube with the swivel mount, then with the effectual parcel of boundary between inlayer floral tube and the outer floral tube inboard at the swivel mount, avoided infiltration or pollution etc. between inlayer floral tube and the outer floral tube, improved the stability and the accuracy of experiment.
In order to improve the adaptability of the device, the micro thermal test device for determining the thermophysical property parameters of the aquifer further comprises more than one group of lengthening tubes, each group of lengthening tubes comprises an inner lengthening tube and an outer lengthening tube, the top of the inner lengthening tube is provided with a first upper splicing interface, the top of the outer lengthening tube is provided with a second upper splicing interface, the bottom of the inner lengthening tube is provided with a first lower splicing interface, and the bottom of the outer lengthening tube is provided with a second lower splicing interface; the first upper splicing interface and the first lower splicing interface are matched with each other, and the second upper splicing interface and the second lower splicing interface are matched with each other; thus, a plurality of inner lengthening pipes can be spliced together along the axial direction, and a plurality of outer lengthening pipes can also be spliced together along the axial direction, so as to play a role in lengthening the inner layer floral tubes and the outer layer floral tubes according to the requirement;
the bottom of the inner layer perforated pipe is provided with a third lower splicing connector, the bottom of the outer layer perforated pipe is provided with a fourth lower splicing connector, and the bottom of the inner layer perforated pipe is provided with a detachably connected bottom cover;
the first upper splicing interface of the inner lengthening pipe can be movably connected to the third lower splicing interface of the inner layer perforated pipe, and then the required number of inner lengthening pipes are spliced at the bottom of the inner layer perforated pipe; the second upper splicing connector of the outer lengthening pipe can be movably connected to the fourth lower splicing connector of the outer layer perforated pipe, and similarly, when the length of the excitation device needs to be increased, the required number of the outer lengthening pipes can be spliced at the bottom of the outer layer perforated pipe. The bottom cover can be movably connected to the bottom of the inner lengthening pipe, when the length of the excitation device needs to be increased, the bottom cover is detached from the bottom of the inner tube, and the bottom cover is connected to the bottom of the inner lengthening pipe. Of course, the length and number of the inner and outer elongated tubes required in one experiment are the same.
The side wall of the inner growth pipe is provided with an inner layer permeation hole, and the side wall of the outer growth pipe is provided with an outer layer permeation hole; when the inner layer permeation hole on the inner layer floral tube and the outer layer permeation hole on the outer layer floral tube are completely overlapped, the inner layer permeation hole on the inner growth tube and the outer layer permeation hole on the outer growth tube are also completely overlapped; when the inner layer permeation holes on the inner layer floral tubes and the outer layer permeation holes on the outer layer floral tubes do not coincide at all, the inner layer permeation holes on the inner growth tubes and the outer layer permeation holes on the outer growth tubes do not coincide at all. That is, the opening and closing of the penetration holes on the inner and outer lengthening pipes are synchronous with the opening and closing of the penetration holes on the inner and outer layer perforated pipes.
The mode is adopted to be suitable for testing aquifers with different thicknesses.
In order to improve the waterproofness, a waterproof rubber ring is arranged between the top plate cover and the tops of the inner layer flower tube and the outer layer flower tube, and a waterproof rubber ring is also arranged between the bottoms of the inner layer flower tube and the outer layer flower tube and the bottom cover.
The hoisting lead comprises a core part and a protective layer; the protective layer is coated on the periphery of the core part and is made of waterproof and electricity-proof materials; the core part is formed by combining a data transmission line, a power line and a hoisting load-bearing line, and has the functions of data transmission, power control, load-bearing hoisting, water resistance and electricity prevention; the computer control and data acquisition system is connected with the water pressure and temperature integrated sensing probe and the motor power system through a data transmission line and a power line, and performs control and data acquisition.
In order to facilitate the injection of hot water, a hot water inlet pipe is connected to the water inlet valve port.
The device is a micro-thermal test device which is established on the porous medium heat transfer theory, instantly and stably excites a linear heat source in the aquifer, and researches the thermophysical property parameters of the aquifer under the radial flow condition by recording the temperature change of a well hole.
A method for determining the thermophysical property parameter of the aquifer by using the micro-thermal test device for determining the thermophysical property parameter of the aquifer comprises the following steps:
1) rotating the double-layer casing excitation device until the penetration hole is closed, and placing the double-layer casing excitation device into the well hole by using a hoisting lead;
2) after the water pressure and temperature data are stable and are sensed by the water pressure and temperature integrated sensing probe and transmitted to the computer control and data acquisition system through the hoisting lead, hot water with a certain temperature is injected through the water inlet valve port to fill the double-layer sleeve excitation device, the computer control and data acquisition system controls the motor power system to drive the rotating frame to rotate the double-layer sleeve excitation device, the permeation hole is opened, the hot water is instantaneously released, and the excitation of the linear heat source is realized;
3) recording water pressure temperature data which is changed along with time in the well hole and is sensed by the water pressure temperature integrated sensing probe through the computer control and data acquisition system, and lifting the double-layer sleeve excitation device out of the well hole after the water pressure temperature data is restored to the water pressure temperature before heating water in the step 2) and is kept unchanged;
4) after the water in the double-layer sleeve excitation device is drained, repeating the steps 1) -3) to finish the micro-thermal tests with different convection conditions and different excitation intensities;
5) deriving the water pressure temperature change data in the steps 2) -4) through a computer control and data acquisition system, distributing wires on logarithmic paper with the same modulus of the standard curve according to a standard curve of dimensionless temperature change and dimensionless time obtained by a micro-thermal test theory and an actually measured curve of dimensionless temperature change and time in a well hole, selecting a matching point after fitting, recording corresponding coordinate values, and solving the thermophysical property parameters of the aquifer.
Further preferably, the method comprises the steps of:
1) determining the length of the double-layer sleeve excitation device according to the length of the aquifer test segment, wherein the length of the test segment is required to be consistent with that of the double-layer sleeve excitation device, and the length of the double-layer sleeve excitation device can be adjusted by using the lengthening tube;
2) rotating the double-layer casing excitation device until the penetration holes are closed, simultaneously completely closing the first upper hole and the second upper hole, and placing the double-layer casing excitation device into the well hole by using a hoisting lead;
3) after water pressure and temperature data which are sensed by the water pressure and temperature integrated sensing probe and transmitted to the computer control and data acquisition system through the hoisting lead are stable, hot water with a certain temperature is injected through a water inlet valve port until the double-layer sleeve excitation device is filled, the computer control and data acquisition system controls the motor power system to drive the rotating frame to rotate the double-layer sleeve excitation device, the permeation hole, the first upper hole and the second upper hole are opened, hot water is released instantaneously, and the excitation of a linear heat source is realized;
4) recording water pressure temperature data which is changed along with time in the well hole and is sensed by the water pressure temperature integrated sensing probe through the computer control and data acquisition system, and lifting the double-layer sleeve excitation device out of the well hole after the water pressure temperature data is restored to the water pressure temperature before heating water in the step 3) and is kept unchanged;
5) after the water in the double-layer sleeve excitation device is drained, repeating the steps 2) -4) to finish the micro-thermal tests under different convection conditions and different excitation intensities;
6) deriving the water pressure temperature change data in the steps 3) -5) through a computer control and data acquisition system, distributing wires on logarithmic paper with the same modulus of the standard curve according to a standard curve of dimensionless temperature change and dimensionless time obtained by a micro-thermal test theory and an actually measured curve of dimensionless temperature change and time in a well hole, selecting a matching point after fitting, recording corresponding coordinate values, and obtaining the thermophysical property parameters of the aquifer. The different convection conditions described above can be achieved by varying the height of the water level in the well bore and the different excitation intensities can be achieved by varying the temperature of the injected hot water.
The computer control and data acquisition system can enable a tester to remotely control the motor power system at the top end of the testing device on the ground by using a computer so as to open or close the penetration hole and the upper hole and complete the transmission and recording of test data.
The test device can carry out the migration test research of the radial heat source in the aquifer indoors or outdoors, the temperature change of the well hole is caused by simulating the instantaneous and stable excitation of the linear heat source in the well hole, and the test data is processed to further obtain the thermophysical property parameter of the aquifer. The device has advantages of wide application condition, flexible arrangement, convenient data acquisition and the like, and has good popularization and application values.
The prior art is referred to in the art for techniques not mentioned in the present invention.
The micro-thermal test device for determining the thermophysical parameters of the aquifer has a simple structure, is intelligent and convenient to operate, hoists the double-layer casing excitation device into a well hole through the hoisting lead, instantaneously excites a first-line heat source, observes the change rule of the temperature through the computer control and data acquisition system, and researches the thermophysical parameters of the aquifer; furthermore, the device can be suitable for the aquifer of different thickness through changing double-deck sheathed tube length, is applicable to laboratory test and field test, and the suitability is strong.
Drawings
FIG. 1 is a schematic structural diagram of a micro-thermal testing device for determining thermophysical parameters of an aquifer according to the invention;
FIG. 2 is a schematic structural diagram of a double-walled casing excitation device according to the present invention;
FIG. 3 is a flow chart of the micro-thermal test of the present invention.
In the figure, 1 is computer control and data acquisition system, 2 is the hoist and mount wire, 3 is motor power system, 4 is the valve port of intaking, 5 is the roof lid, 6 is the integrative sensing probe of water pressure temperature, 7 is outer layer infiltration hole, 8 is inlayer infiltration hole, 9 is the concatenation interface, 10 is waterproof rubber circle, 11 is double-deck sleeve pipe excitation device, 12 is the swivel mount.
Detailed Description
For better understanding of the present invention, the following examples are given for further illustration of the present invention, but the present invention is not limited to the following examples.
The terms "central," "upper," "lower," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like in this application are used in a generic and descriptive sense only and not for purposes of limitation.
Example 1
As shown in figure 1, the micro-thermal test device for determining the thermophysical parameters of the aquifer comprises a computer control and data acquisition system 1, a hoisting lead 2, a motor power system 3, a rotating frame 12, a double-layer sleeve excitation device 11 and a water pressure and temperature integrated sensing probe 6;
the top of the double-layer sleeve excitation device 11 is provided with a top plate cover 5, the motor power system 3 is arranged on the top plate cover 5, and the edge of the top plate cover 5 is provided with a water inlet valve port 4;
the water pressure and temperature integrated sensing probe 6 is arranged on the outer side wall of the double-layer sleeve excitation device 11; the computer control and data acquisition system 1 is connected with the motor power system 3 and the water pressure and temperature integrated sensing probe 6 through a hoisting lead 2;
the motor power system 3 is connected with the double-layer sleeve excitation device 11 through the rotating frame 12, the side wall of the double-layer sleeve excitation device 11 is provided with a penetration hole, the rotating frame 12 drives the double-layer sleeve excitation device 11 to rotate under the driving of the motor power system 3, the double-layer sleeve excitation device can rotate until the penetration hole is opened or closed, and when the penetration hole is closed, the water inlet valve port 4 can be communicated to the inner side of the double-layer sleeve excitation device 11.
As shown in fig. 3, a method for determining the thermal property parameter of the aquifer by using the micro-thermal test device for determining the thermal property parameter of the aquifer comprises the following steps:
1) rotating the double-layer casing excitation device 11 until the penetration hole is closed, simultaneously completely closing the first upper hole and the second upper hole, and placing the double-layer casing excitation device 11 into a well hole by a hoisting lead;
2) after the water pressure and temperature data which are sensed by the water pressure and temperature integrated sensing probe 6 and transmitted to the computer control and data acquisition system 1 through the hoisting lead 2 are stable, hot water with a certain temperature is injected through the water inlet valve port 4 (until the double-layer sleeve excitation device 11 is filled), the computer control and data acquisition system 1 controls the motor power system 3 to drive the rotating frame 12 to rotate the double-layer sleeve excitation device 11, the permeation hole, the first upper hole and the second upper hole are opened, hot water is released instantaneously, and the excitation of a linear heat source is realized;
3) recording water pressure temperature data which is changed along with time in the well hole and is sensed by the water pressure temperature integrated sensing probe 6 through the computer control and data acquisition system 1, and lifting the double-layer casing excitation device 11 out of the well hole after the water pressure temperature data is restored to the water pressure temperature before heating water in the step 2) and is kept unchanged;
4) after the water in the double-layer sleeve excitation device 11 is drained, repeating the steps 1) -3) to finish the micro-thermal tests with different convection conditions and different excitation intensities;
5) deriving the water pressure temperature change data in the steps 2) -4) through the computer control and data acquisition system 1, obtaining a standard curve of dimensionless temperature change and dimensionless time and an actually measured curve of dimensionless temperature change and time in a well hole or an observation hole according to a micro-thermal test theory, wiring on logarithmic paper with the same modulus of the standard curve, selecting a matching point after fitting, recording corresponding coordinate values, and solving the thermophysical property parameters of the aquifer.
Example 2
On the basis of the embodiment 1, the following improvements are further made: as shown in fig. 2, in order to simplify the structure and facilitate the operation, the double-walled tube excitation device 11 includes an inner-layer perforated tube and an outer-layer perforated tube; the inner layer flower tube and the outer layer flower tube are both cylindrical, the height of each inner layer flower tube is 80cm, the outer diameter of each outer layer flower tube is 10cm, and the inner layer flower tube is arranged on the inner side of the outer layer flower tube and is adhered to the inner wall of the outer layer flower tube; the side wall of the inner layer perforated pipe is provided with 5 inner layer permeation holes 8, the side wall of the outer layer perforated pipe is provided with 5 outer layer permeation holes 7, and the heights of the 5 inner layer permeation holes 8 and the 5 outer layer permeation holes 7 are equal; the motor power system 3 is connected with the outer layer perforated pipe through the rotating frame 12, the rotating frame 12 drives the outer layer perforated pipe to rotate under the driving of the motor power system 3, the outer layer perforated pipe can rotate until the inner layer penetration hole 8 and the outer layer penetration hole 7 are completely overlapped and the penetration hole is opened at the moment, the inner layer penetration hole 8 and the outer layer penetration hole 7 are not overlapped and the penetration hole is closed at the moment, and when the penetration hole is closed, the water inlet valve port 4 can be communicated to the inner side of the inner layer perforated pipe.
Example 3
On the basis of the embodiment 2, the following improvements are further made: in order to improve the excitation stability, a first upper hole is arranged on the top plate cover 5, the rotating frame 12 is of a short cylinder structure with a top surface, the central position of the top surface of the rotating frame 12 is connected with a rotating shaft of the motor power system 3, and a second upper hole and a water inlet hole communicated with the water inlet valve port 4 are arranged on the top surface of the rotating frame 12; when the inner layer permeation hole 8 and the outer layer permeation hole 7 are completely superposed, the first upper hole and the second upper hole are also completely superposed, and at the moment, water in a well hole is communicated with the inner side of the inner layer perforated pipe through the first upper hole covered by the top plate and the second upper hole on the top surface of the rotating frame; when the inner layer permeation hole 8 and the outer layer permeation hole 7 do not coincide at all, the first upper hole and the second upper hole do not coincide at all, and at the moment, the water inlet hole on the top surface of the rotating frame 12 is communicated with the water inlet valve port 4. Therefore, hot water can be stably excited, a heat source is stably dissipated, and when the water pressure in the well hole entering from the top cover plate is equal to the water pressure of the aquifer, a micro-thermal test under the condition of no seepage is formed; when the water pressure in the well hole entering from the top cover plate is greater than the water pressure of the aquifer, a micro-thermal test under the seepage condition is formed, so that different convection conditions and different excitation strength tests can be set. Before the test, the inner and outer layers of permeation holes are staggered and closed, and the upper hole on the top plate cover is closed to form a closed waterproof cylindrical hollow pipe. During the test, the cylindrical hollow pipe is filled with water from the upper water inlet valve port, hot water is filled in the exciting device for the test, and the filled hot water does not pollute the environment and underground water and can simulate a linear heat source.
The method for determining the thermophysical property parameter of the aquifer by using the micro-thermal test device for determining the thermophysical property parameter of the aquifer comprises the following steps:
1) rotating the double-layer casing excitation device 11 until the penetration holes and the upper holes are closed (the penetration hole on the inner layer is not overlapped with the penetration hole on the outer layer, and the first upper hole is not overlapped with the second upper hole), and placing the double-layer casing excitation device 11 into a well hole by a hoisting lead;
2) after the water pressure and temperature data which are sensed by the water pressure and temperature integrated sensing probe 6 and transmitted to the computer control and data acquisition system 1 through the hoisting lead 2 are stable, hot water with a certain temperature is rapidly injected through the water inlet valve port 4 until the double-layer casing excitation device 11 is filled, the computer control and data acquisition system 1 controls the motor power system 3 to drive the rotating frame 12 to rotate the double-layer casing excitation device 11, the permeation hole and the upper hole (the inner layer permeation hole is completely superposed with the outer layer permeation hole, the first upper hole is completely superposed with the second upper hole) are opened, hot water is instantaneously released, and the linear heat source is excited;
3) recording water pressure temperature data which is changed along with time in the well hole and is sensed by the water pressure temperature integrated sensing probe 6 through the computer control and data acquisition system 1, and lifting the double-layer casing excitation device 11 out of the well hole after the water pressure temperature data is restored to the water pressure temperature before heating water in the step 2) and is kept unchanged;
4) after the water in the double-layer sleeve excitation device 11 is drained, repeating the steps 1) -3) to finish the micro-thermal test under different conditions (different convection conditions, different excitation strengths and the like);
5) deriving the water pressure temperature change data in the steps 3) -4) through the computer control and data acquisition system 1, distributing wires on logarithmic paper with the same modulus of the standard curve according to a standard curve of dimensionless temperature change and dimensionless time obtained by a micro-thermal test theory and an actually measured curve of dimensionless temperature change and time in a well hole, selecting a matching point after fitting, recording corresponding coordinate values, and solving the thermophysical property parameters of the aquifer.
Example 4
On the basis of the embodiment 3, the following improvements are further made: in order to improve the adaptability of the device in use, the micro thermal test device for determining the thermophysical property parameters of the aquifer further comprises more than one group of lengthened pipes, each group of lengthened pipes comprises an inner lengthened pipe and an outer lengthened pipe, the top of the inner lengthened pipe is provided with a first upper splicing interface, the top of the outer lengthened pipe is provided with a second upper splicing interface, the bottom of the inner lengthened pipe is provided with a first lower splicing interface, and the bottom of the outer lengthened pipe is provided with a second lower splicing interface; the first upper splicing interface and the first lower splicing interface are matched with each other, and the second upper splicing interface and the second lower splicing interface are matched with each other; thus, a plurality of inner extension pipes can be spliced together along the axial direction, and a plurality of outer extension pipes can also be spliced together along the axial direction;
the bottom of the inner layer perforated pipe is provided with a third lower splicing interface, the bottom of the outer layer perforated pipe is provided with a fourth lower splicing interface, and the bottom of the inner layer perforated pipe is provided with a detachably connected bottom cover;
the first upper splicing interface of the inner lengthening pipe can be movably connected to the third lower splicing interface of the inner layer perforated pipe, and then the required number of inner lengthening pipes are spliced at the bottom of the inner layer perforated pipe; the second upper splicing connector of the outer lengthening pipe can be movably connected to the fourth lower splicing connector of the outer layer perforated pipe, and similarly, when the length of the excitation device needs to be increased, the required number of the outer lengthening pipes can be spliced at the bottom of the outer layer perforated pipe. The bottom cover can be movably connected to the bottom of the inner lengthening pipe, when the length of the excitation device needs to be increased, the bottom cover is detached from the bottom of the inner tube, and the bottom cover is connected to the bottom of the inner lengthening pipe. Of course, the length and number of the inner and outer elongated tubes required in one experiment are the same.
The side wall of the inner growth pipe is provided with an inner layer permeation hole, and the side wall of the outer growth pipe is provided with an outer layer permeation hole; when the inner layer permeation hole on the inner layer perforated pipe and the outer layer permeation hole on the outer layer perforated pipe are completely coincided, the inner layer permeation hole on the inner growth pipe and the outer layer permeation hole on the outer growth pipe are also completely coincided; when the inner layer permeation holes on the inner layer floral tubes and the outer layer permeation holes on the outer layer floral tubes do not coincide at all, the inner layer permeation holes on the inner growth tubes and the outer layer permeation holes on the outer growth tubes do not coincide at all. That is, the opening and closing of the penetration holes on the inner and outer lengthening pipes are synchronous with the opening and closing of the penetration holes on the inner and outer layer perforated pipes.
The hoisting conductor 2 comprises a core part and a protective layer; the protective layer is coated on the periphery of the core part and is made of waterproof and electricity-proof materials; the core part is formed by combining a data transmission line, a power line and a hoisting load-bearing line, and has the functions of data transmission, power control, load-bearing hoisting, water resistance and electricity prevention; the computer control and data acquisition system 1 is connected with the water pressure and temperature integrated sensing probe 6 and the motor power system 3 through a data transmission line and a power line, and performs control and data acquisition. In order to facilitate the injection of hot water, the water inlet valve port 4 is connected with a hot water inlet pipe. During testing, the length of the double-layer sleeve excitation device is determined according to the length of the aquifer test segment, the length of the test segment is required to be consistent with that of the double-layer sleeve excitation device, and the length of the double-layer sleeve excitation device is adjusted by using the extension tube.
Example 5
On the basis of the embodiment 4, the following improvements are further made: in order to improve the waterproofness, a waterproof rubber ring 10 is arranged between the top plate cover 5 and the tops of the inner and outer layer floral tubes, and a waterproof rubber ring 10 is also arranged between the bottoms of the inner and outer layer floral tubes and the bottom cover.
The test is carried out by taking the medium and fine sand with the grain diameter of 0.25mm-0.50mm as the aquifer, the flow rate is not considered, the water level in the well hole is not changed, the temperature of the injected hot water is 65 ℃, 75 ℃ and 85 ℃, the measured heat conductivity coefficient of the medium and fine sand is completely consistent with 1.7-5.0W/(m.DEG C) disclosed by the technical manual, the time for each measurement is about 50 minutes, and the test is efficient and accurate.
The test device of each example can carry out the migration test research of the radial heat source in the aquifer indoors or outdoors, the temperature change of the well hole is caused by simulating the instantaneous and stable excitation of the linear heat source in the well hole, and the test data is processed to obtain the thermophysical property parameter of the aquifer. The device has advantages of wide application condition, flexible arrangement, convenient data acquisition and the like, and has good popularization and application values.
Claims (10)
1. The utility model provides a little thermal test device of definite aquifer thermophysical property parameter which characterized in that: the device comprises a computer control and data acquisition system (1), a hoisting lead (2), a motor power system (3), a rotating frame (12), a double-layer sleeve excitation device (11) and a water pressure and temperature integrated sensing probe (6);
the top of the double-layer sleeve excitation device (11) is provided with a top plate cover (5), the motor power system (3) is arranged on the top plate cover (5), and the edge of the top plate cover (5) is provided with a water inlet valve port (4);
the water pressure and temperature integrated sensing probe (6) is arranged on the outer side wall of the double-layer sleeve excitation device (11); the computer control and data acquisition system (1) is connected with the motor power system (3) and the water pressure and temperature integrated sensing probe (6) through a hoisting lead (2);
the motor power system (3) is connected with the double-layer sleeve excitation device (11) through the rotating frame (12), the side wall of the double-layer sleeve excitation device (11) is provided with a penetration hole, the rotating frame (12) drives the double-layer sleeve excitation device (11) to rotate under the driving of the motor power system (3), the double-layer sleeve excitation device can rotate to open the penetration hole and also rotate to close the penetration hole, and when the penetration hole is closed, the water inlet valve port (4) can be communicated to the inner side of the double-layer sleeve excitation device (11).
2. A microthermometric test device for determining thermophysical parameters of an aquifer according to claim 1, wherein: the double-layer sleeve excitation device (11) comprises an inner layer floral tube and an outer layer floral tube; the inner layer flower tube and the outer layer flower tube are both cylindrical, and the inner layer flower tube is arranged on the inner side of the outer layer flower tube and is adhered to the inner wall of the outer layer flower tube; the side wall of the inner layer perforated pipe is provided with an inner layer permeation hole (8), and the side wall of the outer layer perforated pipe is provided with an outer layer permeation hole (7); the motor power system (3) is connected with the inner layer floral tube or the outer layer floral tube through the rotating frame (12), the rotating frame (12) drives the inner layer floral tube or the outer layer floral tube to rotate under the driving of the motor power system (3), the inner layer floral tube or the outer layer floral tube can rotate until the inner layer permeation hole (8) and the outer layer permeation hole (7) are completely overlapped, the permeation hole is opened at the moment, the inner layer permeation hole (8) and the outer layer permeation hole (7) do not have any overlapping, the permeation hole is closed at the moment, and when the permeation hole is closed, the water inlet valve port (4) can be communicated to the inner side of the inner layer floral tube.
3. A microthermometric test device for determining thermophysical parameters of an aquifer according to claim 2, wherein: a first upper hole is formed in the top plate cover (5), the rotating frame (12) is of a short cylinder structure with a top surface, the central position of the top surface of the rotating frame (12) is connected with a rotating shaft of the motor power system (3), and a second upper hole and a water inlet hole communicated with the water inlet valve port (4) are formed in the top surface of the rotating frame (12); when the inner layer permeation hole (8) and the outer layer permeation hole (7) are completely superposed, the first upper hole and the second upper hole are also completely superposed, and at the moment, water in a well hole is communicated with the inner side of the inner layer perforated pipe through the first upper hole in the top plate cover (5) and the second upper hole on the top surface of the rotating frame (12); when the inner layer permeation hole (8) and the outer layer permeation hole (7) do not coincide at all, the first upper hole and the second upper hole do not coincide at all, and at the moment, the water inlet hole on the top surface of the rotating frame (12) is communicated with the water inlet valve port (4).
4. A microthermometric test device for determining thermophysical parameters of an aquifer according to claim 3, wherein: the rotating frame (12) is connected with the outer layer perforated pipe, and the rotating frame (12) drives the outer layer perforated pipe to rotate under the driving of the motor power system (3).
5. A microthermometric test device for determining thermophysical parameters of an aquifer according to claim 4, wherein: the pipe joint comprises an inner lengthening pipe and an outer lengthening pipe, and is characterized by further comprising more than one group of lengthening pipes, wherein each group of lengthening pipes comprises an inner lengthening pipe and an outer lengthening pipe, the top of the inner lengthening pipe is provided with a first upper splicing connector, the top of the outer lengthening pipe is provided with a second upper splicing connector, the bottom of the inner lengthening pipe is provided with a first lower splicing connector, and the bottom of the outer lengthening pipe is provided with a second lower splicing connector; the first upper splicing interface and the first lower splicing interface are matched with each other, and the second upper splicing interface and the second lower splicing interface are matched with each other;
the bottom of the inner layer perforated pipe is provided with a third lower splicing connector, the bottom of the outer layer perforated pipe is provided with a fourth lower splicing connector, and the bottom of the inner layer perforated pipe is provided with a detachably connected bottom cover;
the first upper splicing interface of the inner lengthening pipe is movably connected to the third lower splicing interface of the inner layer perforated pipe, the second upper splicing interface of the outer lengthening pipe is movably connected to the fourth lower splicing interface of the outer layer perforated pipe, and the bottom cover is movably connected to the bottom of the inner lengthening pipe;
the side wall of the inner growth pipe is provided with an inner layer permeation hole, and the side wall of the outer growth pipe is provided with an outer layer permeation hole; when the inner layer permeation hole on the inner layer floral tube and the outer layer permeation hole on the outer layer floral tube are completely overlapped, the inner layer permeation hole on the inner growth tube and the outer layer permeation hole on the outer growth tube are also completely overlapped; when the inner layer permeation holes on the inner layer floral tubes and the outer layer permeation holes on the outer layer floral tubes do not coincide at all, the inner layer permeation holes on the inner growth tubes and the outer layer permeation holes on the outer growth tubes do not coincide at all.
6. A microthermometric test device for determining thermophysical parameters of an aquifer according to claim 5, wherein: waterproof rubber rings (10) are arranged between the top plate cover (5) and the tops of the inner layer floral tube and the outer layer floral tube, and waterproof rubber rings (10) are also arranged between the bottoms of the inner layer floral tube and the outer layer floral tube and the bottom cover.
7. A microthermometric test device for determining thermophysical parameters of an aquifer according to any one of claims 1 to 6, wherein: the hoisting lead (2) comprises a core part and a protective layer; the protective layer is coated on the periphery of the core part and is made of waterproof and electricity-proof materials; the core part is formed by combining a data transmission line, a power line and a hoisting load-bearing line; the computer control and data acquisition system (1) is connected with the water pressure and temperature integrated sensing probe (6) and the motor power system (3) through a data transmission line and a power line.
8. A microthermographic test apparatus as claimed in any one of claims 1 to 6 wherein: the water inlet valve port (4) is connected with a hot water inlet pipe.
9. A method of determining a thermophysical parameter of an aquifer using the micro-thermal testing apparatus for determining a thermophysical parameter of an aquifer according to any one of claims 1 to 8, wherein: the method comprises the following steps:
1) rotating the double-layer casing excitation device (11) until the penetration hole is closed, and placing the double-layer casing excitation device (11) into the well hole by a hoisting lead;
2) after water pressure temperature data which are sensed by a water pressure and temperature integrated sensing probe (6) and transmitted to a computer control and data acquisition system (1) through a hoisting lead (2) are stable, hot water with a certain temperature is injected through a water inlet valve port (4) until the double-layer sleeve excitation device (11) is filled, the computer control and data acquisition system (1) controls a motor power system (3) to drive a rotating frame (12) to rotate the double-layer sleeve excitation device (11), a permeation hole is opened, hot water is released instantaneously, and excitation of a linear heat source is realized;
3) recording water pressure temperature data which is changed along with time in the well hole and is sensed by the water pressure temperature integrated sensing probe (6) through the computer control and data acquisition system (1), and lifting the double-layer sleeve excitation device (11) out of the well hole after the water pressure temperature data is restored to the water pressure temperature before heating water in the step 2) and is kept unchanged;
4) after water in the double-layer sleeve excitation device (11) is drained, repeating the steps 1) -3) to finish micro-thermal tests under different convection conditions and different excitation strengths;
5) deriving the water pressure temperature change data in the steps 2) -4) through a computer control and data acquisition system (1), obtaining a standard curve of dimensionless temperature change and dimensionless time and an actually measured curve of dimensionless temperature change and time in a well hole according to a micro-thermal test theory, wiring on log paper with the same modulus of the standard curve, selecting a matching point after fitting, recording corresponding coordinate values, and solving the thermophysical property parameters of the aquifer.
10. The method of claim 9, wherein: the method comprises the following steps:
1) determining the length of a double-layer sleeve excitation device (11) according to the length of an aquifer test section, wherein the length of the test section is required to be consistent with the length of the double-layer sleeve excitation device (11), and the length of the double-layer sleeve excitation device (11) can be adjusted by using an extension pipe;
2) rotating the double-layer casing excitation device (11) until the penetration hole is closed, simultaneously completely closing the first upper hole and the second upper hole, and placing the double-layer casing excitation device (11) into a well hole by a hoisting lead;
3) after water pressure temperature data which are sensed by a water pressure and temperature integrated sensing probe (6) and transmitted to a computer control and data acquisition system (1) through a hoisting lead (2) are stable, hot water with a certain temperature is injected through a water inlet valve port (4) until the double-layer sleeve excitation device (11) is filled, the computer control and data acquisition system (1) controls a motor power system (3) to drive a rotating frame (12) to rotate the double-layer sleeve excitation device (11), a permeation hole, a first upper hole and a second upper hole are opened, hot water is released instantaneously, and excitation of a linear heat source is realized;
4) recording water pressure temperature data which is changed along with time in the well hole and is sensed by the water pressure temperature integrated sensing probe (6) through the computer control and data acquisition system (1), and lifting the double-layer sleeve excitation device (11) out of the well hole after the water pressure temperature data is restored to the water pressure temperature before heating water in the step 3) and is kept unchanged;
5) after the water in the double-layer sleeve excitation device (11) is drained, repeating the steps 2) -4) to finish the micro-thermal tests under different convection conditions and different excitation strengths;
6) deriving the water pressure temperature change data in the steps 3) -5) through a computer control and data acquisition system (1), distributing on logarithmic paper with the same modulus of the standard curve according to a standard curve of dimensionless temperature change and dimensionless time obtained by a micro-thermal test theory and an actually measured curve of dimensionless temperature change and time in a well hole, selecting a matching point after fitting, recording corresponding coordinate values, and solving the thermophysical property parameters of the aquifer.
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Application publication date: 20220729 Assignee: Yangzhou Zhongmei Construction Engineering Co.,Ltd. Assignor: HOHAI University Contract record no.: X2022320000309 Denomination of invention: A Micro thermal Test Device and Method for Determining Thermal Physical Parameters of Aquifers Granted publication date: 20221025 License type: Common License Record date: 20221210 |
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