CN106442614A - Rock thermophysical parameter testing method and testing system under conditions of high temperature and high pressure - Google Patents
Rock thermophysical parameter testing method and testing system under conditions of high temperature and high pressure Download PDFInfo
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- CN106442614A CN106442614A CN201610848074.XA CN201610848074A CN106442614A CN 106442614 A CN106442614 A CN 106442614A CN 201610848074 A CN201610848074 A CN 201610848074A CN 106442614 A CN106442614 A CN 106442614A
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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
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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
- G01N25/18—Investigating or analyzing materials by the use of thermal means by investigating thermal conductivity
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Abstract
The invention provides a rock thermophysical parameter testing method under the conditions of high temperature and high pressure. The method comprises the following steps: processing a deep-layer rock into a rectangular-solid rock sample, putting the rock sample into an MTS true triaxial testing cylinder, carrying out heating and pressurization on the rock sample under the control of an MTS controller, and measuring the thermophysical parameters of the rock sample. The invention also provides a testing system which comprises the MTS controller, the MTS true triaxial testing cylinder, an MTS servo supercharger and an MTS hydraulic machine. The method and system can be utilized to accurately simulate the underground deep layer rock high-pressure state; and the temperature control and acquisition module can keep the rock sample temperature constant, accurately measure the rock sample temperature and accurately simulate the high-temperature state of the underground deep layer rock. A stable flat band process is utilized to measure the heat conductivity coefficient of the rock sample. The system is simple to operate, and has the advantages of high measuring accuracy, short testing period and accurate thermophysical parameter measurement result.
Description
Technical field
The present invention relates to rock thermal physical property parameter method of testing and test system under a kind of High Temperature High Pressure, belong to the hot thing of ground
Property field tests.
Background technology
Energy problem governs the economic development of human society, and the basic road cracking energy problem is renewable energy
Source.Geothermal energy resources are typical clean reproducible energies, have cleaning, sustainable, renewable, the superiority such as can comprehensively utilize,
There is huge economic worth.Geothermal energy includes shallow layer geothermal energy and deep geothermal heat energy.Deep geothermal heat refers to that earth deep layer is thousands of
The higher geothermal energy of rice, 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 enhancement mode geothermal system (EGS) proposing especially 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 inject water or other working fluid (such as CO by injection well2Deng)
Carry out underground circulation, by artificially generated connection fissure zone, fluid is heated by contacting with rock mass, eventually through producing well
Return to ground, form a closed circuit.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 heat energy.
The key job of enhancement mode geothermal system is exactly extraction heat from underground deep layer rock, therefore accurately measures 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
Coefficient is relevant with factors such as its structure, density, humidity, temperature, pressure.Under normal circumstances, the temperature, pressure of same substance is relatively
When low, heat conductivity coefficient is less.Conventional rock thermal physical property parameter is all measurement under normal temperature and pressure, but underground deep layer rock
It is in a kind of high-temperature high-pressure state, thermal physical property parameter now has larger different, therefore the grinding of this test system from conventional
It is formed with important researching value, using with evaluation, there is directive function to enhancement mode 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 enhancement mode geothermal system is in high-temperature high-pressure state,
The space to rock for the High Temperature High Pressure, structure, density important, and then have influence on the thermal physical property parameter of rock, therefore need
Want rock thermal physical property parameter test system measurement underground deep layer rock thermal physical property parameter under a kind of High Temperature High Pressure.
And there is pressurization or the rock thermal physical property parameter test system of heating function usually needs manually to control hydraulic servo
To pressurize to rock sample, precision is difficult to control to pump, and needs the multiple data of manual measurement, and to test job, unavoidable increase is permitted
Many burdens.
Content of the invention
In order to solve the deficiencies in the prior art, the invention provides rock thermal physical property parameter test side under a kind of High Temperature High Pressure
The associated components of rock mechanics test system (MTS) are carried out redesigning transformation by method and test system, true by transforming MTS
Three axle test cylinders, increase temperature control modules and acquisition module, can simulate enhancement mode geothermal system in MTS true triaxial test cylinder
The environment of the residing High Temperature High Pressure of system, and be uniformly controlled using controller, easily record high temperature under this operating mode high
Pressure rock thermal physical property parameter test system.
The present invention be employed technical scheme comprise that by its technical problem of solution：Provide brucellosis thing under a kind of High Temperature High Pressure
Property parameter test method, comprises the following steps：
(1) underground deep layer rock initial processing field acquisition arrived is foursquare cuboid rock examination for cross section
Sample, rock sample surface is polished flat smooth, with vernier caliper measurement rock sample size, determines its height δ and calculates horizontal stroke
Sectional area F；
(2) rock sample is vertically put into MTS true triaxial test cylinder test intracavity, allow a pair of rock sample relative
Side surface is affixed with two measurement ends of thermocouple sensor respectively, in four side surfaces making rock sample and test cylinder
Flat board plane heat source contact, finally cover MTS true triaxial test cylinder upper lid, make test chamber seal；
(3) pressurization instruction is sent on MTS controller, pressurization instruction is transferred to MTS servo booster by shielding line, by
MTS servo booster controls MTS hydraulic press to drive MTS true triaxial to test 3 pairs of effect axles of the test intracavity of cylinder, makes three to effect
Axle contacts and applies different size of pressure in the x, y, and z directions with 6 faces of rock sample；
(4) send, on MTS controller, finger of heating, instruction of heating is transferred to platen surface heat source controller pair by shielding line
Rock sample is heated, flat board plane heat source with and electrical power Q heats and maintains temperature to rock sample, temperature range be 50～
300℃；
(5) treat that the test cavity temperature of MTS true triaxial test cylinder is stable, thermocouple sensor measures the two of rock sample
End temperature Δ t simultaneously transmits to MTS controller；
(6) MTS controller calculates the heat conductivity λ of rock sample under High Temperature High Pressure by below equation：
In step (1), cross section is that foursquare cuboid rock sample size is specially 150 × 150 × 300mm, step
Suddenly (3) three pairs of effect axles are contacted with 6 faces of rock sample and apply constant pressure is 0.5kN.
Invention also provides rock thermal physical property parameter test system under a kind of High Temperature High Pressure of above-mentioned method of testing, bag
Include interconnective MTS controller and test cylinder with MTS true triaxial, MTS controller passes through shielding line phase with MTS true triaxial test cylinder
Connect；MTS controller is connected to MTS servo booster by shielding line, and described MTS servo booster is divided by hydraulic oil pipe
It is not connected to described MTS true triaxial test cylinder and MTS hydraulic press；The inside that described MTS true triaxial tests cylinder is for placing length
The airtight test chamber of cube rock sample, test intracavity is provided with the MTS tri- axle hydraulic pressure for pressurizeing to cuboid rock sample
System, temperature control modules and acquisition module；MTS tri- axle hydraulic system includes the top surface for acting on rock sample and side
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 servo
Supercharger connects；Temperature control modules be by MTS controller control for the platen surface being attached on the side surface of rock sample
Thermal source, described flat board plane heat source is connected to MTS controller by shielding line；Acquisition module is the temperature difference being controlled by MTS controller
Thermocouple sensor, two measurement ends of described thermocouple sensor are respectively used to be placed in one group of opposite flank of rock sample
On, described thermocouple sensor is connected to MTS controller by shielding line；Described MTS controller adopts workstation computer.
The induction precision of described thermocouple sensor is 0.1 DEG C.
The pressure controling precision of described MTS tri- axle hydraulic system is 0.001kN.
The temperature range of described flat board plane heat source is 50～300 DEG C.
The upper end that described MTS true triaxial tests cylinder is provided with the closure compressing by fixing bolt.
The present invention is had advantageous effect in that based on its technical scheme：
(1) present invention is provided with MTS controller, the temperature of its direct and MTS servo booster and MTS true triaxial test cylinder
Control module and MTS tri- axle hydraulic system, can reach the precise control to pressurization and heating, and hydraulic control precision can reach
0.001kN, deep layer rock high pressure state under accurate simulation；
(2) MTS true triaxial test cylinder is true triaxial, can provide 3 different stress, with one in X on tri- directions of Y, Z
The false triaxial test system that a little three axles apply uniform pressure is compared, being capable of more accurate underground NOL ring residing for simulation rock
Border；The inside that MTS true triaxial tests cylinder is simultaneously provided with flat board plane heat source, temperature control modules and acquisition module, and three is equal
It is connected with MTS controller, 50～300 DEG C of flat board plane heat source heating-up temperature, temperature control modules and acquisition module can maintain rock
Stone specimen temperature is constant, accurate measurement rock sample temperature, compared with the test system measuring under normal temperature state with some, this
Bright being capable of the accurate simulation underground deep layer rock condition of high temperature；
(3) utilize rock thermal physical property parameter test system under a kind of High Temperature High Pressure of the present invention, stable state flat board can be passed through
Method measures rock sample heat conduction parameter, with vernier caliper measurement rock sample thickness and heat-conducting area, and then tries to achieve rock sample
Heat conductivity；Compared with some test the system of rock heat conductivity by placement thermal probe of holing in the sample, the application
Avoiding test data is affected by boring and probe contact condition, stably can heat at sample two ends, and then accurate test
The heat conductivity of rock sample, and operate simpler；
(4) under a kind of High Temperature High Pressure of the present invention, rock thermal physical property parameter test system is simple to operate, and measuring accuracy is high, surveys
Examination cycle is short, the thermal physical property parameter result recording is accurate.
Brief description
Fig. 1 be the present invention a kind of High Temperature High Pressure under rock thermal physical property parameter test system schematic diagram.
Fig. 2 is MTS true triaxial test cylinder front view.
Fig. 3 is MTS true triaxial test cylinder top view.
Fig. 4 is temperature control modules and acquisition module schematic diagram.
In figure：1-MTS true triaxial test cylinder, 101- effect axle, 102- flat board plane heat source, 103- thermocouple sensor,
104- fixing bolt, 2-MTS servo booster, 3-MTS controller, 4-MTS hydraulic press, 5- rock sample, 6- hydraulic oil pipe, 7-
Shielding line.
Specific embodiment
The invention will be further described with reference to the accompanying drawings and examples.
The invention provides rock thermal physical property parameter method of testing under a kind of High Temperature High Pressure, comprise the following steps：
(1) underground deep layer rock initial processing field acquisition arrived is foursquare cuboid rock examination for cross section
Sample, rock sample surface is polished flat smooth, with vernier caliper measurement rock sample size, determines its height δ and calculates horizontal stroke
Sectional area F；
(2) rock sample is vertically put into MTS true triaxial test cylinder test intracavity, allow a pair of rock sample relative
Side surface is affixed with two measurement ends of thermocouple sensor respectively, in four side surfaces making rock sample and test cylinder
Flat board plane heat source contact, finally cover MTS true triaxial test cylinder upper lid, make test chamber seal；
(3) pressurization instruction is sent on MTS controller, pressurization instruction is transferred to MTS servo booster by shielding line, by
MTS servo booster controls MTS hydraulic press to drive MTS true triaxial to test 3 pairs of effect axles of the test intracavity of cylinder, makes three to effect
Axle contacts and applies different size of pressure in the x, y, and z directions with 6 faces of rock sample；
(4) send, on MTS controller, finger of heating, instruction of heating is transferred to platen surface heat source controller pair by shielding line
Rock sample is heated, flat board plane heat source with and electrical power Q heats and maintains temperature to rock sample, temperature range be 50～
300℃；
(5) treat that the test cavity temperature of MTS true triaxial test cylinder is stable, thermocouple sensor measures the two of rock sample
End temperature Δ t simultaneously transmits to MTS controller；
(6) MTS controller calculates the heat conductivity λ of rock sample under High Temperature High Pressure by below equation：
In step (1), cross section is that foursquare cuboid rock sample size is specially 150 × 150 × 300mm, step
Suddenly (3) three pairs of effect axles are contacted with 6 faces of rock sample and apply constant pressure is 0.5kN.
The invention provides rock thermal physical property parameter test system under a kind of High Temperature High Pressure, with reference to Fig. 1, including being connected with each other
Controller with test cylinder, described controller be MTS control 3, described test cylinder be MTS true triaxial test cylinder 1, MTS controller 3
Test cylinder 1 with MTS true triaxial to be connected with each other by shielding line 7；MTS controller 3 is connected to the supercharging of MTS servo by shielding line 7
Device 2, described MTS servo booster 2 is connected to described MTS true triaxial by hydraulic oil pipe 6 and tests cylinder 1 and MTS hydraulic press
4.
With reference to Fig. 2 and Fig. 3, the inside that described MTS true triaxial tests cylinder is for placing the airtight of cuboid rock examination 5
Test chamber, test intracavity be provided with for pressurize to cuboid rock sample MTS tri- axle hydraulic system, temperature control modules and
Acquisition module；MTS tri- axle hydraulic system includes the effect axle 101 of top surface for acting on rock sample and side, wherein, top
The effect axle in face and two effect axles positioned at adjacent side are connected with MTS servo booster by hydraulic oil pipe 6；Temperature control
Molding block be by MTS controller control for the flat board plane heat source 102 being attached on the side surface of rock sample, i.e. lamellar heating
Device, described flat board plane heat source 102 is connected to MTS controller by shielding line 7；Acquisition module is the temperature being controlled by MTS controller
Difference thermocouple sensor 103, two measurement ends of described thermocouple sensor 103 are respectively used to be placed in one group of phase of rock sample
To on side, described thermocouple sensor is connected to MTS controller by shielding line 7.
With reference to Fig. 3 and Fig. 4, the contralateral surface that rock sample is close to by thermocouple sensor 103 disposes, flat board fever sensation of the face
Source 102 is then wrapped in 4 side surfaces of rock sample, and is located at the outside of thermocouple sensor 103.So it is easy to the temperature difference
The temperature of thermocouple sensor accurate measurement rock sample.
The induction precision of described thermocouple sensor is 0.1 DEG C.
The pressure controling precision of described MTS tri- axle hydraulic system is 0.001kN.
The upper end that described MTS true triaxial tests cylinder is provided with the closure compressing by fixing bolt 104.
Described MTS controller adopts workstation computer.
Using rock thermal physical property parameter test system under a kind of High Temperature High Pressure of the present invention, can measure according to following steps
Rock sample heat conductivity：
Step one：To field acquisition underground deep layer rock initial processing, rock sample a size of 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 in MTS true triaxial test cylinder, closes MTS true triaxial test cylinder cylinder door, start
MTS system, arranges MTS tri- axle hydraulic system 0.5kN axle power by MTS controller, makes MTS tri- axle hydraulic system and rock sample
Contact；
Step 3：MTS tri- axle hydraulic system is arranged by MTS controller and applies high pressure to rock sample, maintain pressure permanent
Fixed；
Step 4：By MTS controller, set heating-up temperature to rock sample, flat board plane heat source is with rated power Q to rock
The heating of stone sample maintains high temperature, and after temperature stabilization, thermocouple measures rock sample two ends temperature Δ t, finally by following
Formula calculates rock sample heat conductivity λ under High Temperature High Pressure：
The present invention utilizes MTS mechanics test system, can reach the precise control to power, including MTS controller, MTS watches
Take supercharger, MTS hydraulic press, MTS true triaxial tests cylinder, and MTS tri- axle hydraulic system can be with precise control hydraulic pressure, control accuracy
0.001kN, accurate simulation underground deep layer rock high pressure state.Second, using temperature control and acquisition module, rock can be maintained
Specimen temperature is constant, accurate measurement rock sample temperature, the accurate simulation underground deep layer rock condition of high temperature.Third, utilizing stable state
Flat band method measures rock sample heat conductivity, and with vernier caliper measurement rock sample height δ, heat conducting cross-sectional amasss F.To sample plus
Heat pressurization, after sample pressure and temp is stable, records temperature difference t on flat board two sides, by the heat conduction amount Q of flat board.According to one
It is directly proportional by the heat conduction amount Q of flat board and temperature difference t on flat board two sides in the case of stability maintenance state, and the thickness δ of flat board is directly proportional, with
And be directly proportional with heat conductivity λ.Under High Temperature High Pressure, rock sample heat conductivity λ can be calculated by below equation：
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 measurement rock sample temperature, the accurate simulation underground deep layer rock condition of high temperature；Utilize stable state simultaneously
Flat band method measures rock sample heat conductivity, and system operatio is simple, and measuring accuracy is high, and test period is short, and thermal physical property parameter surveys knot
Fruit is accurately.
Claims (7)
1. under a kind of High Temperature High Pressure rock thermal physical property parameter method of testing it is characterised in that comprising the following steps：
(1) underground deep layer rock initial processing field acquisition arrived is foursquare cuboid rock sample for 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 vertically put into the test intracavity that MTS true triaxial tests cylinder, allow a pair relative side table of rock sample
Face is affixed with two measurement ends of thermocouple sensor respectively, flat in four side surfaces making rock sample and test cylinder
Plate face thermal source contacts, and finally covers the upper lid that MTS true triaxial tests cylinder, so that test chamber is sealed；
(3) pressurization instruction is sent on MTS controller, pressurization instruction is transferred to MTS servo booster by shielding line, by MTS
Servo booster controls MTS hydraulic press to drive MTS true triaxial to test 3 pairs of effect axles of the test intracavity of cylinder, makes three pairs of effect axles
Contact and apply different size of pressure in the x, y, and z directions with 6 faces of rock sample；
(4) send, on MTS controller, finger of heating, instruction of heating is transferred to platen surface heat source controller to rock by shielding line
Sample is heated, flat board plane heat source with and electrical power Q heats and maintains temperature to rock sample, temperature range be 50～300
℃；
(5) treat that the test cavity temperature of MTS true triaxial test cylinder is stable, thermocouple sensor measures the two ends temperature of rock sample
Degree Δ t simultaneously transmits to MTS controller；
(6) MTS controller calculates the heat conductivity λ of rock sample under High Temperature High Pressure by below equation：
2. under High Temperature High Pressure according to claim 1 rock thermal physical property parameter method of testing it is characterised in that：Step (1)
In, cross section is that foursquare cuboid rock sample size is specially 150 × 150 × 300mm, (3) three pairs of effect axles of step
Contacting and apply constant pressure with 6 faces of rock sample is 0.5kN.
3. rock thermal physical property parameter test system under a kind of High Temperature High Pressure based on method of testing described in claim 1, its feature
It is：Test cylinder including interconnective MTS controller and MTS true triaxial, MTS controller is passed through with MTS true triaxial test cylinder
Shielding line is connected with each other；MTS controller is connected to MTS servo booster by shielding line, and described MTS servo booster passes through liquid
Pressuring oil pipe is connected to described MTS true triaxial test cylinder and MTS hydraulic press；The inside that described MTS true triaxial tests cylinder is use
In the airtight test chamber placing cuboid rock sample, test intracavity is provided with the MTS for pressurizeing to cuboid rock sample
Three axle hydraulic systems, temperature control modules and acquisition module；MTS tri- axle hydraulic system is included for acting on rock sample
Top surface and the effect axle of side, wherein, the effect axle of top surface and two effect axles positioned at adjacent side pass through hydraulic oil pipe
It is connected with MTS servo booster；Temperature control modules are the side surface for being attached to rock sample being controlled by MTS controller
Flat board plane heat source, described flat board plane heat source is connected to MTS controller by shielding line；Acquisition module is by MTS controller control
The thermocouple sensor of system, two measurement ends of described thermocouple sensor are respectively used to be placed in one group of phase of rock sample
To on side, described thermocouple sensor is connected to MTS controller by shielding line；Described MTS controller adopts work station
Computer.
4. under High Temperature High Pressure according to claim 3 rock thermal physical property parameter test system it is characterised in that：The described temperature difference
The induction precision of thermocouple sensor is 0.1 DEG C.
5. under High Temperature High Pressure according to claim 3 rock thermal physical property parameter test system it is characterised in that：Described MTS
The pressure controling precision of three axle hydraulic systems is 0.001kN.
6. under High Temperature High Pressure according to claim 3 rock thermal physical property parameter test system it is characterised in that：Described flat board
The temperature range of plane heat source is 50～300 DEG C.
7. under High Temperature High Pressure according to claim 3 rock thermal physical property parameter test system it is characterised in that：Described MTS
The upper end that true triaxial tests cylinder is provided with the closure compressing by fixing bolt.
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| CN106950249A (en) * | 2017-03-14 | 2017-07-14 | 东北大学 | The analysis experimental provision of rock thermal conductivity is tested under a kind of simulation different pressures |
| CN108562610A (en) * | 2018-03-13 | 2018-09-21 | 中国石油天然气股份有限公司 | A kind of method and system of determining thermal conductivity of rocks |
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| CN114577844A (en) * | 2022-02-23 | 2022-06-03 | 四川纳川致远新能源科技有限公司 | Rock thermal conductivity anisotropy experimental device for simulating formation stress |
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