CN106442614B - Rock thermal physical property parameter test method and test system under a kind of high temperature and pressure - Google Patents
Rock thermal physical property parameter test method and test system under a kind of high temperature and pressure Download PDFInfo
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- CN106442614B CN106442614B CN201610848074.XA CN201610848074A CN106442614B CN 106442614 B CN106442614 B CN 106442614B CN 201610848074 A CN201610848074 A CN 201610848074A CN 106442614 B CN106442614 B CN 106442614B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/18—Investigating or analyzing materials by the use of thermal means by investigating thermal conductivity
Abstract
The present invention provides rock thermal physical property parameter test methods under a kind of high temperature and pressure, deep layer rock is processed as cuboid rock sample, it is put into MTS true triaxials test cylinder, is controlled to rock sample temperature-pressure by MTS controllers, measure rock sample thermal physical property parameter.Invention also provides a kind of test system, system includes the MTS controllers being connected with each other, MTS true triaxials test cylinder, MTS servo boosters and MTS hydraulic presses.Using the present invention can accurate simulation underground deep layer rock high pressure state, temperature control and acquisition module can maintain rock sample temperature constant, accurate to measure rock sample temperature, the accurate simulation underground deep layer rock condition of high temperature；Rock sample thermal coefficient is measured using stable state flat band method simultaneously, system operatio is simple, and measuring accuracy is high, and test period is short, and it is accurate that thermal physical property parameter surveys result.
Description
Technical field
The present invention relates to rock thermal physical property parameter test method under a kind of high temperature and pressure and test systems, belong to the hot object of ground
Property testing field.
Background technology
Energy problem restricts the economic development of human society, and the basic road for cracking energy problem is renewable energy
Source.Geothermal energy resources are typical clean reproducible energies, have and the superiority such as clean, is sustainable, renewable, can comprehensively utilize,
With huge economic value.Geothermal energy includes shallow layer geothermal energy and deep geothermal heat energy.Deep geothermal heat refers to that earth deep layer is thousands of
Rice, the higher geothermal energy of temperature, deep geothermal heat energy stock number is huge, has a extensive future.Geothermal energy became scientific research in recent years
The emphasis of staff's research, the enhanced geothermal system (EGS) especially proposed on the basis of hot dry rock production technique, in recent years
To become the research emphasis in deep geothermal heat field.EGS refers to injecting water or other working fluids (such as CO by injection well2Deng)
Underground cycle is carried out, by artificially generated connection fissure zone, fluid is heated by being contacted with rock mass, eventually by producing well
Ground is returned to, a closed circuit is formed.EGS is to build geothermal reservoir with engineering measure, from hypotonicity rock mass economically
Produce the artificial geothermal system of a considerable amount of deep layer thermal energy.
The key job of enhanced geothermal system is exactly heat to be extracted from underground deep layer rock, therefore accurately measure underground
The thermal physical property parameter of deep layer rock has important directive significance to deep geothermal heat exploitation.In general, the heat conduction of same substance
The factors such as coefficient and its structure, density, humidity, temperature, pressure are related.Under normal conditions, the temperature, pressure of same substance compared with
When low, thermal coefficient coefficient is smaller.Conventional rock thermal physical property parameter is measured under normal temperature and pressure, however underground deep layer rock
In a kind of high-temperature high-pressure state, thermal physical property parameter at this time and the conventional larger difference that has, therefore the test system is ground
It is formed with important researching value, there is directive function to the utilization and evaluation of enhanced geothermal system.
Existing Rock And Soil thermal physical property parameter test system mainly measures superficial layer ground body thermo physical property ginseng at normal temperatures and pressures
Number, reflection be underground shallow layer rock thermal physical property parameter.The rock formation of enhanced geothermal system is in high-temperature high-pressure state,
High temperature and pressure influences the thermal physical property parameter of rock to the gap of rock, structure, density important, therefore needs
Want rock thermal physical property parameter test systematic survey underground deep layer rock thermal physical property parameter under a kind of high temperature and pressure.
And the rock thermal physical property parameter test system with pressurization or heating function usually needs manual control hydraulic servo
To pressurize to rock sample, precision is difficult to control pump, and needs a variety of data of manual measurement, is inevitably increased test job and is permitted
More burdens.
Invention content
In order to solve the deficiencies in the prior art, the present invention provides rock thermal physical property parameter test sides under a kind of high temperature and pressure
The associated components of rock mechanics test system (MTS) are carried out redesign transformation by method and test system, true by the way that MTS is transformed
Three axis test cylinder, increase temperature control modules and acquisition module, and enhanced geothermal system can be simulated by being tested in cylinder in MTS true triaxials
The environment of the residing high temperature and pressure of system, and be uniformly controlled using controller, high temperature height is easily measured under this operating mode
It depresses rock thermal physical property parameter and tests system.
The present invention is technical solution used by solving its technical problem：Provide rock fever object under a kind of high temperature and pressure
Property parameter test method, includes the following steps：
(1) to field acquisition to underground deep layer rock preparatory processing be that the cuboid rock that is square of cross section tries
Sample polishes flat rock sample surface smooth, with vernier caliper measurement rock sample size, determines its height δ and calculates cross
Sectional area F；
(2) rock sample is put into vertically in the test chamber of MTS true triaxials test cylinder, makes a pair of rock sample opposite
Side surface is affixed with two measurement ends of thermoelectric couple sensor respectively, then is made in four side surfaces and test cylinder of rock sample
Tablet plane heat source contact, finally cover MTS true triaxials test cylinder upper cover, so that test chamber is sealed；
(3) pressurization instruction is sent out on MTS controllers, pressurization instruction is transferred to MTS servo boosters by shielding line, by
MTS servo boosters control 3 pairs of effect axles in the test chamber of MTS hydraulic presses driving MTS true triaxials test cylinder, make three pairs of effects
Axis contacts with 6 faces of rock sample and applies different size of pressure in the x, y, and z directions；
(4) heating instruction is sent out on MTS controllers, heating instruction is transferred to platen surface heat source controller by shielding line
Rock sample is heated, tablet plane heat source heats to rock sample with rated power Q and maintain temperature, temperature range 50
~300 DEG C；
(5) wait for that the test cavity temperature of MTS true triaxials test cylinder is stablized, the two of thermoelectric couple sensor measurement rock sample
End temperature Δ t is simultaneously transmitted to MTS controllers；
(6) MTS controllers are calculated by the following formula the thermal coefficient λ of rock sample under high temperature and pressure：
In step (1), the cuboid rock sample size that cross section is square is specially 150 × 150 × 300mm, step
Suddenly it is 0.5kN that (3) three pairs of effect axles, which contact with 6 faces of rock sample and apply constant pressure,.
Invention also provides rock thermal physical property parameters under a kind of high temperature and pressure of above-mentioned test method to test system, packet
It includes the MTS controllers of interconnection and MTS true triaxials tests cylinder, MTS controllers pass through shielding line phase with MTS true triaxials test cylinder
It connects；MTS controllers are connected to MTS servo boosters by shielding line, and the MTS servo boosters pass through hydraulic oil pipe point
It is not connected to the MTS true triaxials test cylinder and MTS hydraulic presses；The inside of the MTS true triaxials test cylinder is for placing length
The closed test chamber of cube rock sample, the interior tri- axis hydraulic pressure of MTS being equipped with for pressurizeing to cuboid rock sample of test chamber
System, temperature control modules and acquisition module；Tri- axis hydraulic systems of MTS include the top surface and side for acting on rock sample
The effect axle in face, wherein the effect axle of top surface and two effect axles positioned at adjacent side pass through hydraulic oil pipe and MTS servos
Booster connects；Temperature control modules are the platen surface for being attached on the side surface of rock sample controlled by MTS controllers
Heat source, the tablet plane heat source are connected to MTS controllers by shielding line；Acquisition module is the temperature difference controlled by MTS controllers
Thermocouple sensor, two measurement ends of the thermoelectric couple sensor are respectively used to be placed in one group of opposite flank of rock sample
On, the thermoelectric couple sensor is connected to MTS controllers by shielding line；The MTS controllers use workstation computer.
The induction precision of the thermoelectric couple sensor is 0.1 DEG C.
The pressure controling precision of tri- axis hydraulic systems of the MTS is 0.001kN.
The temperature range of the tablet plane heat source is 50~300 DEG C.
The upper end of the MTS true triaxials test cylinder is equipped with the sealing cover compressed by fixing bolt.
The present invention is based on advantageous effects possessed by its technical solution to be：
(1) present invention is equipped with MTS controllers, it directly tests the temperature of cylinder with MTS servo boosters and MTS true triaxials
Tri- axis hydraulic system of control module and MTS, can reach and be accurately controlled to what is pressurizeed and heat, hydraulic control precision can reach
0.001kN, deep layer rock high pressure state under accurate simulation；
(2) MTS true triaxials test cylinder is true triaxial, 3 different stress can be provided on X, tri- directions Y, Z, with one
The false triaxial test system that a little three axis apply uniform pressures is compared, underground NOL ring that can be residing for more accurate simulation rock
Border；The inside that MTS true triaxials test cylinder is equipped with tablet plane heat source, temperature control modules and acquisition module simultaneously, and three is equal
It is connect with MTS controllers, 50~300 DEG C of tablet plane heat source heating temperature, temperature control modules and acquisition module can maintain rock
Stone specimen temperature is constant, accurate to measure rock sample temperature, compared with some test measured under normal temperature state systems, this hair
It is bright being capable of the accurate simulation underground deep layer rock condition of high temperature；
(3) system is tested using rock thermal physical property parameter under a kind of high temperature and pressure of the present invention, stable state tablet can be passed through
Method measures rock sample heat conduction parameter, with vernier caliper measurement rock sample thickness and heat-conducting area, and then acquires rock sample
Thermal coefficient；Compared with some are by system of the placement thermal probe to test rock thermal coefficient that drill in the sample, the application
Avoid test data is influenced by drilling and probe contact condition, can be stablized at sample both ends and be heated, and then accurately test
The thermal coefficient of rock sample, and operate simpler；
(4) rock thermal physical property parameter test system operatio is simple under a kind of high temperature and pressure of the invention, and measuring accuracy is high, surveys
The examination period is short, and the thermal physical property parameter result measured is accurate.
Description of the drawings
Fig. 1 be the present invention a kind of high temperature and pressure under rock thermal physical property parameter test system schematic.
Fig. 2 is MTS true triaxials test cylinder front view.
Fig. 3 is MTS true triaxials test cylinder vertical view.
Fig. 4 is temperature control modules and acquisition module schematic diagram.
In figure：1-MTS true triaxials test cylinder, 101- effect axles, 102- tablet plane heat sources, 103- thermoelectric couple sensors,
104- fixing bolts, 2-MTS servo boosters, 3-MTS controllers, 4-MTS hydraulic presses, 5- rock samples, 6- hydraulic oil pipes, 7-
Shielding line.
Specific implementation mode
The invention will be further described with reference to the accompanying drawings and examples.
The present invention provides rock thermal physical property parameter test methods under a kind of high temperature and pressure, include the following steps：
(1) to field acquisition to underground deep layer rock preparatory processing be that the cuboid rock that is square of cross section tries
Sample polishes flat rock sample surface smooth, with vernier caliper measurement rock sample size, determines its height δ and calculates cross
Sectional area F；
(2) rock sample is put into vertically in the test chamber of MTS true triaxials test cylinder, makes a pair of rock sample opposite
Side surface is affixed with two measurement ends of thermoelectric couple sensor respectively, then is made in four side surfaces and test cylinder of rock sample
Tablet plane heat source contact, finally cover MTS true triaxials test cylinder upper cover, so that test chamber is sealed；
(3) pressurization instruction is sent out on MTS controllers, pressurization instruction is transferred to MTS servo boosters by shielding line, by
MTS servo boosters control 3 pairs of effect axles in the test chamber of MTS hydraulic presses driving MTS true triaxials test cylinder, make three pairs of effects
Axis contacts with 6 faces of rock sample and applies different size of pressure in the x, y, and z directions；
(4) heating instruction is sent out on MTS controllers, heating instruction is transferred to platen surface heat source controller by shielding line
Rock sample is heated, tablet plane heat source heats to rock sample with rated power Q and maintain temperature, temperature range 50
~300 DEG C；
(5) wait for that the test cavity temperature of MTS true triaxials test cylinder is stablized, the two of thermoelectric couple sensor measurement rock sample
End temperature Δ t is simultaneously transmitted to MTS controllers；
(6) MTS controllers are calculated by the following formula the thermal coefficient λ of rock sample under high temperature and pressure：
In step (1), the cuboid rock sample size that cross section is square is specially 150 × 150 × 300mm, step
Suddenly it is 0.5kN that (3) three pairs of effect axles, which contact with 6 faces of rock sample and apply constant pressure,.
The present invention provides rock thermal physical property parameters under a kind of high temperature and pressure to test system, referring to Fig.1, including is connected with each other
Controller with test cylinder, the controller be MTS control 3, the test cylinder be MTS true triaxials test cylinder 1, MTS controllers 3
It is connected with each other by shielding line 7 with MTS true triaxials test cylinder 1；MTS controllers 3 are connected to the supercharging of MTS servos by shielding line 7
Device 2, the MTS servo boosters 2 are connected to the MTS true triaxials by hydraulic oil pipe 6 and test cylinder 1 and MTS hydraulic presses
4。
With reference to Fig. 2 and Fig. 3, the inside of the MTS true triaxials test cylinder is for placing the closed of cuboid rock examination 5
Test chamber, be equipped in test chamber tri- axis hydraulic systems of MTS for pressurizeing to cuboid rock sample, temperature control modules and
Acquisition module；Tri- axis hydraulic systems of MTS include the effect axle 101 of top surface and side for acting on rock sample, wherein top
It the effect axle in face and is connect with MTS servo boosters by hydraulic oil pipe 6 positioned at two effect axles of adjacent side；Temperature control
Molding block is the tablet plane heat source 102 for being attached on the side surface of rock sample controlled by MTS controllers, i.e. sheet heats
Device, the tablet plane heat source 102 are connected to MTS controllers by shielding line 7；Acquisition module is the temperature controlled by MTS controllers
Poor thermocouple sensor 103, two measurement ends of the thermoelectric couple sensor 103 are respectively used to be placed in one group of phase of rock sample
To on side, the thermoelectric couple sensor is connected to MTS controllers by shielding line 7.
With reference to Fig. 3 and Fig. 4, thermoelectric couple sensor 103 is tightly attached to the contralateral surface placement of rock sample, platen surface heat
Source 102 is then wrapped in 4 side surfaces of rock sample, and positioned at the outside of thermoelectric couple sensor 103.It is convenient for the temperature difference in this way
Thermocouple sensor accurately measures the temperature of rock sample.
The induction precision of the thermoelectric couple sensor is 0.1 DEG C.
The pressure controling precision of tri- axis hydraulic systems of the MTS is 0.001kN.
The upper end of the MTS true triaxials test cylinder is equipped with the sealing cover compressed by fixing bolt 104.
The MTS controllers use workstation computer.
System is tested using rock thermal physical property parameter under a kind of high temperature and pressure of the present invention, can be measured according to the following steps
Rock sample thermal coefficient：
Step 1：To field acquisition underground deep layer rock preparatory processing, rock sample size is 150*150*300mm, rock
Stone specimen surface polishes flat smooth.With vernier caliper measurement rock sample height δ, cross-sectional area F；
Step 2：Rock sample is put into MTS true triaxials test cylinder, MTS true triaxials is closed and tests cylinder cylinder door, start
MTS systems are arranged tri- axis hydraulic system 0.5kN axle powers of MTS by MTS controllers, make tri- axis hydraulic systems of MTS and rock sample
Contact；
Step 3：Tri- axis hydraulic systems of MTS are set by MTS controllers and apply high pressure to rock sample, maintain pressure permanent
It is fixed；
Step 4：By MTS controllers, heating temperature is set to rock sample, tablet plane heat source is with rated power Q to rock
The heating of stone sample maintains high temperature, and after temperature stabilization, thermoelectric couple measures rock sample both ends temperature Δ t, finally by following
Rock sample thermal coefficient λ under high temperature and pressure is calculated in formula：
The present invention utilizes MTS mechanics test systems, can reach and be accurately controlled to power, including MTS controllers, MTS are watched
Booster, MTS hydraulic presses are taken, MTS true triaxials test cylinder, and tri- axis hydraulic systems of MTS can accurately control hydraulic pressure, control accuracy
0.001kN, accurate simulation underground deep layer rock high pressure state.Second, temperature in use control and acquisition module, can maintain rock
Specimen temperature is constant, accurate to measure rock sample temperature, the accurate simulation underground deep layer rock condition of high temperature.Third, utilizing stable state
Flat band method measures rock sample thermal coefficient, and with vernier caliper measurement rock sample height δ, heat conducting cross-sectional accumulates F.To sample plus
Heat pressurization measures the temperature difference t on tablet two sides, passes through the heat conduction amount Q of tablet after sample pressure and temp stabilization.According to one
It is directly proportional directly proportional with the thickness δ of tablet by the temperature difference t of the heat conduction amount Q of tablet and tablet two sides in the case of stability maintenance state, with
And it is directly proportional with thermal coefficient λ.Rock sample thermal coefficient λ can be calculated by the following formula under high temperature and pressure：
Using the present invention can accurate simulation underground deep layer rock high pressure state, temperature control and acquisition module can maintain rock
Stone specimen temperature is constant, accurate to measure rock sample temperature, the accurate simulation underground deep layer rock condition of high temperature；Stable state is utilized simultaneously
Flat band method measures rock sample thermal coefficient, and system operatio is simple, and measuring accuracy is high, and test period is short, and thermal physical property parameter surveys knot
Fruit is accurate.
Claims (7)
1. rock thermal physical property parameter test method under a kind of high temperature and pressure, it is characterised in that include the following steps：
(1) to field acquisition to underground deep layer rock preparatory processing be the cuboid rock sample that is square of cross section, will
Rock sample surface polishes flat smooth, with vernier caliper measurement rock sample size, determines its height δ and calculates cross-sectional area
F；
(2) rock sample is put into vertically in the test chamber of MTS true triaxials test cylinder, the side table for making a pair of rock sample opposite
Face is affixed with two measurement ends of thermoelectric couple sensor respectively, then makes four side surfaces of rock sample and putting down in test cylinder
Plate face heat source contacts, and finally covers the upper cover of MTS true triaxials test cylinder, test chamber is made to seal；
(3) pressurization instruction is sent out on MTS controllers, pressurization instruction is transferred to MTS servo boosters by shielding line, by MTS
Servo booster controls 3 pairs of effect axles in the test chamber of MTS hydraulic presses driving MTS true triaxials test cylinder, makes three pairs of effect axles
It is contacted with 6 faces of rock sample and applies different size of pressure in the x, y, and z directions；
(4) heating instruction is sent out on MTS controllers, heating instruction is transferred to platen surface heat source controller to rock by shielding line
Stone sample is heated, and tablet plane heat source heats to rock sample with rated power Q and maintain temperature, and temperature range is 50~
300℃；
(5) wait for that the test cavity temperature of MTS true triaxials test cylinder is stablized, the both ends temperature of thermoelectric couple sensor measurement rock sample
Degree Δ t is simultaneously transmitted to MTS controllers；
(6) MTS controllers are calculated by the following formula the thermal coefficient λ of rock sample under high temperature and pressure：
2. rock thermal physical property parameter test method under high temperature and pressure according to claim 1, it is characterised in that：Step (1)
In, the cuboid rock sample size that cross section is square is specially 150 × 150 × 300mm, (3) three pairs of effect axles of step
It is 0.5kN to be contacted with 6 faces of rock sample and apply constant pressure.
3. rock thermal physical property parameter tests system, feature under a kind of high temperature and pressure based on test method described in claim 1
It is：MTS controllers including interconnection test cylinder with MTS true triaxials, and MTS controllers pass through with MTS true triaxials test cylinder
Shielding line is connected with each other；MTS controllers are connected to MTS servo boosters by shielding line, and the MTS servo boosters pass through liquid
Pressuring oil pipe is connected to the MTS true triaxials test cylinder and MTS hydraulic presses；The inside of the MTS true triaxials test cylinder is to use
In the closed test chamber for placing cuboid rock sample, the interior MTS being equipped with for pressurizeing to cuboid rock sample of test chamber
Three axis hydraulic systems, temperature control modules and acquisition module；Tri- axis hydraulic systems of MTS include for acting on rock sample
The effect axle of top surface and side, wherein the effect axle of top surface and two effect axles positioned at adjacent side pass through hydraulic oil pipe
It is connect with MTS servo boosters；Temperature control modules are the side surface for being attached to rock sample controlled by MTS controllers
Tablet plane heat source, the tablet plane heat source is connected to MTS controllers by shielding line；Acquisition module is by MTS controller controls
The thermoelectric couple sensor of system, two measurement ends of the thermoelectric couple sensor are respectively used to be placed in one group of phase of rock sample
To on side, the thermoelectric couple sensor is connected to MTS controllers by shielding line；The MTS controllers use work station
Computer.
4. rock thermal physical property parameter tests system under high temperature and pressure according to claim 3, it is characterised in that：The temperature difference
The induction precision of thermocouple sensor is 0.1 DEG C.
5. rock thermal physical property parameter tests system under high temperature and pressure according to claim 3, it is characterised in that：The MTS
The pressure controling precision of three axis hydraulic systems is 0.001kN.
6. rock thermal physical property parameter tests system under high temperature and pressure according to claim 3, it is characterised in that：The tablet
The temperature range of plane heat source is 50~300 DEG C.
7. rock thermal physical property parameter tests system under high temperature and pressure according to claim 3, it is characterised in that：The MTS
The upper end of true triaxial test cylinder is equipped with the sealing cover compressed by fixing bolt.
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| CN112362685B (en) * | 2020-12-01 | 2023-03-21 | 安徽理工大学 | Rock high-temperature cycle experimental device |
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