Underground heat hides well pattern formula variable tear volume hot dry rock simulator and experimental method
Technical field
The present invention relates to rock technical field of heat exchange, especially underground heat hiding well pattern formula variable tear volume hot dry rock simulation dress
It sets and experimental method.
Background technique
Currently, environment negative effect brought by energy resource structure based on conventional fossil fuel gradually highlights.For reply
Environmental problem improves energy resource structure, and countries in the world turn one's attention to one after another to have a high potential and the dry-hot-rock geothermal of cleanliness without any pollution
Resource.Hot dry rock is a kind of emerging geothermal energy resources, buries the high heat rock mass in low aperture in underground deep, low-permeability, storage
Energy demand in hot dry rock can just be obtained by the artificial reconstructed enhanced geothermal system of formation, and enhanced geothermal system is
By injecting cryogen into hot dry rock, when fluid passes through High temperature rocks, hot dry rock can be heated, and then pass through extraction
Hot fluid obtains energy.
Since exploiting hot dry rock heat exchange simulated experiment at present is mostly rock core formula experimental provision and numerical simulation software compiling
Simulator prediction technique.Rock core formula experimental provision is the injection and confining pressure control system based on hydraulic pump, is injected by control
Flow, injection pressure, rock temperature measure corresponding pressure by sensing element to study the effect degree under different condition
The experiment parameters such as power, permeability, what one-dimensional single phase fluid flow was mainly studied is the relations of production that a note one adopts well location, can not be right
The water filling of more well heads, exploitation pattern are studied, and method has unicity and one-sidedness, existing injection fluid for monophasic fluid and
Seepage flow is one-dimensional horizontal seepage flow, and mode of seepage is relatively simple, can only simulate idealization seepage flow structural form, can not body
Reveal the simulated conditions when heat exchange of true hot dry rock seepage flow.
Summary of the invention
For the disadvantages mentioned above of the prior art, the present invention provides a kind of underground heat to hide well pattern formula variable tear volume hot dry rock
Simulator replaces original rock core using volume sillar, and the multiple temperature sensing needles being arranged in rock mass obtain its temperature
Variation dynamic, to show the internal change of temperature field of sillar heat exchange, while sillar crack using the cutting to sillar and splice come
Heat exchange situation of the fluid in crack under simulation stratum condition designs multiple water filling ports in sillar injection side, can be used to study
The influence that different injection mode generates the variation of sillar internal temperature field.
Underground heat hides well pattern formula variable tear volume hot dry rock heat exchange simulator, including power and media transport system, rock
Block fixes device, fluid-pressure system,
Power and media transport system by hydraulic pump, the first fluid reservoir, the second fluid reservoir, the first valve, the second valve and
Pressure gauge composition;
The output section of the hydraulic pump is connected with the input unit of first fluid reservoir and the second fluid reservoir respectively by conducting wire
It connects, the output section of first fluid reservoir is connected by conducting wire with first valve, and the output section of second fluid reservoir is logical
It crosses conducting wire to connect with second valve, conduit and connection second fluid reservoir for connecting first fluid reservoir output section are defeated
The conduit in portion merges into the conduit of Y shape out, which is connected with the input unit of the fixed device of the sillar, passes through above-mentioned portion
The input unit of the connection of part, power and media transport system and the fixed device of the sillar is formed leads to for what heat transferring medium transmitted
Road,
The fixed device of sillar is made of rock block, water injection hole, apopore, hygrosensor, steel plate and gum cover;
One layer of steel plate of confining pressure outside the fixed device of the sillar, being bonded long * wide * thickness in the steel plate inner wall is respectively
50*50*0.3 centimetres of inside gum cover is equipped with the rock block being evenly distributed in the internal gum cover, in the note of the rock block
The mouth of a river is equipped with 9 water injection holes, and the adjacent water filling pitch of holes is equal, and the rock block is integrally square, adjacent institute
The transverse and longitudinal spacing stated between rock block is identical, and the fixed device of sillar is divided into left and right two parts, symmetrically, the note corresponding to rock block
It liquid and adopts liquid level and sets, be provided with a threaded hole in each rock block, be equipped with a water filling in the rock block left part
Hole is equipped with an apopore in the rock block right part, and each threaded hole is externally connected to a hygrosensor;
Fluid-pressure system is by confining pressure pump, back-pressure valve, surge tank, hand pump, third valve, graduated cylinder and computer equipment group
At;
The input unit of the fixed device of the sillar is connect by conducting wire with the output section that confining pressure pumps, the fixed device of the sillar
It is connect by conducting wire with computer, the hygrosensor is by the temperature variation data curve record of rock block in computer equipment
In, the output section of the fixed device of the sillar connect with surge tank and hand pump respectively by back-pressure valve, in the back-pressure valve and
Third valve is provided on the conducting wire of the hand pump connection, the one end of the back-pressure valve is also extended with conducting wire and graduated cylinder connects
It is logical.
Based on above scheme, the waterflood injection rate of the hydraulic pump is 1-50mL/mi n.
Based on above scheme, the range of the graduated cylinder is 1L.
Based on above scheme, the maximum pressure of bearing is 4MPa, and maximum temperature is 300 DEG C, and maximum confining pressure is 8MPa.
Based on above scheme, the confining pressure pump connects the confining pressure set, and the confining pressure set is mounted on the fixed dress of the sillar
Outer wall is set, the confining pressure pump carries out confining pressure to the fixed device of the sillar.
Based on above scheme, the hygrosensor is temperature probe, and the temperature probe length is 10cm, the temperature
Probe is by conducting wire by the temperature variation data curve transmission inside sillar to computer equipment.
A kind of experimental method of underground heat hiding well pattern formula variable tear volume hot dry rock heat exchange simulator, steps are as follows,
Step (1): by described device, mode is connected as shown in Figure 1, and it is good to detect each component leakproofness.
Step (2): rock block is put into the fixed device of sillar, applies confining pressure to 8MPa, heating device is warming up to 100 and is taken the photograph
Family name's degree is pressurized to 1MPa by hydraulic pump, and pressure is maintained to keep water outflow, measures outflow water temperature and flow.
Step (3): keeping heating temperature constant, and gradually improving injection pressure is 0.5MPa, until pressure reaches 4MPa, and
Above-mentioned (2) step is repeated, obtains corresponding data.
Step (4): temperature is gradually increased by 50 DEG C, 100 DEG C, 150 DEG C until 300 DEG C, with 50 DEG C for ladder-elevating temperature, lay equal stress on
Multiple step (2), step (3), obtain corresponding data.
Step (5): the data obtained when by different temperatures are transferred to computer equipment, and computer equipment records and analyzes, this
The experiment of secondary well pattern formula variable tear volume hot dry rock heat exchange simulator is completed.
The beneficial effects of the present invention are: well pattern formula variable tear volume hot dry rock heat exchange simulation in underground heat hiding proposed by the present invention
Device replaces original rock core using volume sillar, and sillar is cut by item number, length and angle needed for crack, then splices
It to together, is fixed with confining pressure and gum cover, gap is just produced between sillar and sillar, splitting of generating in stratum is simulated with this
Seam, and temperature change value is transferred to meter by the multiple hygrosensors being arranged in the fixed device of sillar, the measurement through excess temperature
Machine equipment is calculated, the variation dynamic of rock deblocking temperature can be obtained, with the temperature change inside showing rock block in heat transfer process,
The design of sillar left end has water filling port, has apopore in the design of rock block right end, by injecting water, while temperature sensing to water filling port
Device records the heat exchange data value in the mode fracture of different injection water, for studying different injection mode in sillar
The influence that portion's change of temperature field generates.
Detailed description of the invention
Fig. 1 is schematic structural view of the invention;
Fig. 2 is sillar fixture structure schematic diagram of the invention;
Fig. 3 is the fixed device internal structure main view of sillar of the invention;
Fig. 4 is the fixed device internal structure left view of sillar of the invention;
Figure label explanation: 1, hydraulic pump;2, the first fluid reservoir;3, the second fluid reservoir;4, confining pressure pumps;5, surge tank;6,
Hand pump;7, graduated cylinder;8, computer equipment;9, back-pressure valve;10, the fixed device of sillar;11, confining pressure set;12, the first valve;13,
Second valve;14, third valve;15, hygrosensor;16a, water filling port;16b, water outlet;17, pressure gauge.
Specific embodiment
Product of the present invention is further described below in conjunction with structure of the invention drawings and examples, the description of embodiment is only
For ease of understanding and with the application of the invention, rather than to the limitation of the invention protected.
A kind of underground heat hiding well pattern formula variable tear volume hot dry rock heat exchange simulator provided by the invention, using volume rock
Block replaces original rock core, and the multiple temperature sensing needles being arranged in rock mass obtain the variation dynamic of its temperature, to show sillar
Change of temperature field inside heat exchange, at the same sillar crack using to sillar cutting and splicing exist come fluid under simulation stratum condition
Heat exchange situation in crack designs multiple water filling ports in sillar injection side, can be used to study different injection mode in sillar
The influence that portion's change of temperature field generates.
Underground heat hides well pattern formula variable tear volume hot dry rock heat exchange simulator, including power and media transport system, rock
Block fixes device 10, fluid-pressure system,
Power and media transport system are by hydraulic pump 1, the first fluid reservoir 2, the second fluid reservoir 3, the first valve 12, the second valve
Door 13 and pressure gauge 17 form;
The output section of the hydraulic pump 1 passes through the conducting wire input unit with first fluid reservoir 2 and the second fluid reservoir 3 respectively
Connection, the output section of first fluid reservoir 2 are connected by conducting wire and first valve 12, second fluid reservoir 3 it is defeated
Portion is connected by conducting wire and second valve 13 out, is connected the conduit of 2 output section of the first fluid reservoir and is connected described the
The conduit of two fluid reservoirs, 3 output section merges into the conduit of Y shape, the input unit phase of the Y shape conduit and the fixed device 10 of the sillar
Even, by the connection of above-mentioned component, the input unit of power and media transport system and the fixed device 10 of the sillar is formed for changing
The channel of thermal medium transmission,
The fixed device 10 of sillar is by rock block, water filling port 16a, water outlet 16b, hygrosensor 15, steel plate and gum cover group
At;
Fixed 10 outside confining pressure of device, the one layer of steel plate of the sillar, being bonded long * wide * thickness in the steel plate inner wall is respectively
50*50*0.3 centimetres of inside gum cover is equipped with the rock block being evenly distributed in the internal gum cover, sets on the rock block
There are 9 water injection holes, and the adjacent water filling pitch of holes is equal, the rock block is integrally square, the adjacent rock block
Between transverse and longitudinal spacing it is identical, the fixed device 10 of sillar divides for left and right two parts, symmetrically, corresponding to rock block fluid injection and adopt
Liquid level is set, and is provided with a threaded hole in each rock block, is equipped with a water filling port 16a in the rock block left part,
It is equipped with a water outlet 16b in the rock block right part, each threaded hole is externally connected to a hygrosensor 15;
Fluid-pressure system is by confining pressure pump 4, back-pressure valve 9, surge tank 5, hand pump 6, third valve 14, graduated cylinder 7 and calculates
Machine equipment 8 forms;
The input unit of the fixed device 10 of the sillar is connect by conducting wire with the output section of confining pressure pump 4, and the sillar is fixed
Device 10 is connect by conducting wire with computer equipment 8, and the hygrosensor 15 remembers the temperature variation data curve of rock block
Record in computer equipment 8, the output section of the fixed device 10 of the sillar by back-pressure valve 9 respectively with surge tank 5 and hand pump 6
Connection, is provided with third valve 14, one end of the back-pressure valve 9 on the conducting wire that the back-pressure valve 9 is connect with the hand pump 6
Portion is also extended with conducting wire and is connected to graduated cylinder 7.
Based on above scheme, the waterflood injection rate of the hydraulic pump 1 is 1-50mL/mi n.
Based on above scheme, the range of the graduated cylinder 7 is 1L.
Based on above scheme, the maximum pressure of bearing is 4MPa, and maximum temperature is 300 DEG C, and maximum confining pressure is 8MPa.
Based on above scheme, 4 connection of the confining pressure pump confining pressure set 11, it is solid that the confining pressure set 11 is mounted on the sillar
Determine 10 outer wall of device, the confining pressure pumps the fixed device 10 of 4 pairs of sillars and carries out confining pressure.
Based on above scheme, the hygrosensor 15 is temperature probe, and the temperature probe length is 10cm, the temperature
It spends probe and passes through conducting wire for the temperature variation data curve transmission inside sillar to computer equipment 8.
A kind of experimental method of underground heat hiding well pattern formula variable tear volume hot dry rock heat exchange simulator, steps are as follows,
Step (1): by described device, mode is connected as shown in Figure 1, and it is good to detect each component leakproofness.
Step (2): rock block is put into the fixed device of sillar, applies confining pressure to 8MPa, heating device is warming up to 100 and is taken the photograph
Family name's degree is pressurized to 1MPa by hydraulic pump, and pressure is maintained to keep water outflow, measures outflow water temperature and flow.
Step (3): keeping heating temperature constant, and gradually improving injection pressure is 0.5MPa, until pressure reaches 4MPa, and
Above-mentioned (2) step is repeated, obtains corresponding data.
Step (4): temperature is gradually increased by 50 DEG C, 100 DEG C, 150 DEG C until 300 DEG C, with 50 DEG C for ladder-elevating temperature, lay equal stress on
Multiple step (2), step (3), obtain corresponding data.
Step (5): the data obtained when by different temperatures are transferred to computer equipment, and computer equipment records and analyzes, this
The experiment of secondary well pattern formula variable tear volume hot dry rock heat exchange simulator is completed.
Experimental method of the present invention has a characteristic that
Well pattern formula variable tear volume hot dry rock heat exchange simulator in underground heat hiding proposed by the present invention uses volume sillar generation
For original rock core, sillar is cut by item number, length and angle needed for crack, then is spliced together, with confining pressure set 11
It is fixed with gum cover, gap is just produced between rock block and rock block, the crack generated in stratum is simulated with this, and in rock
The multiple hygrosensors 15 being arranged in the fixed device 10 of block transmit temperature change value by the measurement of hygrosensor 15
To computer equipment 8, the variation dynamic of rock deblocking temperature can be obtained, become with the temperature inside showing rock block in heat transfer process
Change, while rock block crack is using the heat exchange feelings of cutting and splicing come fluid under simulation stratum condition in crack to sillar
Condition, in sillar left end, design has water filling port 16a, has water outlet 16b in the design of rock block right end, by injecting to water filling port 16a
Water, while the heat exchange data value in the mode fracture of 15 pairs of hygrosensor different injection water records, for studying not
With the influence that water flooding regime generates the variation of sillar internal temperature field, well arrange formula water filling water breakthrough it is relatively slow and out water speed with a note one
It is essentially identical to adopt formula, but the loss of the liquid measure for caused by water channelling in rock can be effectively prevented, infusing the mode of adopting at high proportion can
Water speed and water yield are improved out, while can guarantee heating efficiency, it is finally dry in well pattern formula variable tear volume for experimental subjects
Heat exchange sunykatuib analysis research under the conditions of hot rock provides basic foundation.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.