CN108709815A - Measure the experimental provision and method of Fracture Toughness of Rocks under low temperature - Google Patents
Measure the experimental provision and method of Fracture Toughness of Rocks under low temperature Download PDFInfo
- Publication number
- CN108709815A CN108709815A CN201810501247.XA CN201810501247A CN108709815A CN 108709815 A CN108709815 A CN 108709815A CN 201810501247 A CN201810501247 A CN 201810501247A CN 108709815 A CN108709815 A CN 108709815A
- Authority
- CN
- China
- Prior art keywords
- experiment
- cushion block
- pressure
- temperature
- low temperature
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/18—Performing tests at high or low temperatures
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0048—Hydraulic means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0222—Temperature
- G01N2203/0228—Low temperature; Cooling means
Abstract
The present invention relates to the experimental provision and method of Fracture Toughness of Rocks under a kind of measurement low temperature, technical solution is to pass through experiment cavity bottom end from supercharging liquid nitrogen container；Fluid recovery tank is connected with experiment cavity top end, and control valve is housed on fluid recovery tank；Hydraulic pressure system passes through loading equipemtn and piston system to be connected with experiment cavity bottom end；The other end of hydraulic pressure system is connected with computer control system；Low-temperature control system is connected with experiment cavity；One end of hydraulic system is connected with computer control system；The other end of hydraulic system is connected across loading equipemtn with piston system；Advantageous effect：The present invention solves the test problem of rock core fracture toughness under low temperature/condition of ultralow temperature, can the more actually rupture of simulation core under cryogenic, to instructing the field applications such as low temperature hydraulic fracturing to be of great significance；In addition, only by replacing different lower cushion blocks, you can while other mechanical characteristics are measured, it is vdiverse in function, it is easy to operate.
Description
Technical field
The present invention relates to rock mechanics field, more particularly to it is a kind of measure under low temperature the experimental provision of Fracture Toughness of Rocks and
Method, the fracture toughness for obtaining rock under cryogenic conditions are the mechanical characteristic of rock under the cryogenic conditions of explication de texte stratum,
The drilling of oil gas, mining site resource is instructed to provide foundation.
Background technology
1981, first shale gas well fracturing success in the U.S.'s demonstrated and develops shale gas using hydraulic fracturing technology
Feasibility.But a large amount of wastes due to hydraulic fracturing to water resource cause the considerations of country such as France is for resource and environment first
Law bans are put into effect afterwards exploits shale gas with hydrofracturing method.In recent years, to solve this problem, domestic and foreign scholars propose newly
The low-temperature anhydrous fracturing technique of type.
The fracture toughness of rock is to judge that can low-temperature anhydrous pressure break form the key parameter of seam net under cryogenic conditions.In recent years
Come, although people obtain the accurate fracture toughness of rock by the method for laboratory test, for complicated geological conditions with
The particularity of rock, various experimental methods and device all have certain scope of application.Such as application No. is CN106769517A,
The patent of invention of CN106644740A discloses the experimental provision that Fracture Toughness of Rocks is tested under the conditions of a kind of pore pressure respectively
And method, although can be used in studying pore pressure, confining pressure, the influence of the factors to rock material fracture toughness such as temperature, and
It during considering that temperature influences, is mainly heated by heating rod, that is, is only capable of realizing hot conditions, but for the low of anhydrous pressure break
Warm environment cannot achieve due to realization mechanism difference using the device.In addition, the test sample of the experimental provision is 3 points of bendings
Beam, and in view of the particularity of rock, the rock sample of 3 bent beam methods prepares difficulty, and is difficult to be clamped, so application is not
By force；Although being common Brazilian disk specimen application No. is the sample that the patent of invention of CN07340165A is utilized, rock is being measured
When stone fracture toughness, the influence of external temperature is not considered.
It is accurate to obtain rock at low ambient temperatures disconnected to meet the requirement that low-temperature anhydrous pressure break is applied in oil-gas mining
Toughness is split, the mechanism of low-temperature anhydrous pressure break is analyzed, the measurement Fracture Toughness of Rocks that can really reflect low-temperature condition need be developed
Experimental provision and method.
Invention content
The purpose of the present invention provides rock fracture under a kind of measurement low temperature aiming at drawbacks described above of the existing technology
The experimental provision and method of toughness, more accurately to test the fracture toughness of rock under the extreme conditions such as low temperature/ultralow temperature.
The experimental provision of Fracture Toughness of Rocks, technical solution are under a kind of measurement low temperature that the present invention mentions：Including certainly
It is pressurized liquid nitrogen container（1）, liquid nitrogen recycling can（3）, hydraulic pressure system（5）, experiment cavity（9）, low-temperature control system（12）, hydraulic loaded
System（13）, computer control system（15）,
It is described to pass through the first high pressure heat-preserving pipeline from supercharging liquid nitrogen container（2）Across experiment cavity（9）Bottom end；
Liquid nitrogen recycling can（3）Pass through the second high pressure heat-preserving pipeline（4）With experiment cavity（9）Top is connected, liquid nitrogen recycling can（3）On
Equipped with control valve；
Hydraulic pressure system（5）One end pass through the first pressure line（6）Across loading equipemtn（7）And piston system（8）With experiment chamber
Body（9）Bottom end is connected；Hydraulic pressure system（5）The other end pass through third data line（16）With computer control system（15）Phase
Even；
Low-temperature control system（12）Pass through first data transmission line（10）With experiment cavity（9）It is connected, first data transmission line
（10）It is furnished with temperature sensor in one end；
Hydraulic loading system（13）One end pass through the second data line（14）With computer control system（15）It is connected；Hydraulic pressure
Loading system（13）The other end pass through the second pressure line（11）Across loading equipemtn（7）With piston system（8）It is connected；
The experiment cavity（9）Including upper cushion block（21）, heat-shrink tube（22）, lower cushion block（24）, shell cavity（25）, buckle
（26）, rubber seal（27）, the shell cavity（25）It is placed in piston system（8）Upper end, rock core（23）It is clipped in cushion block
（21）And lower cushion block（24）Between, heat-shrink tube（22）It is wrapped in rock core（23）, upper cushion block（21）Lower part, lower cushion block（24）'s
The outside of upper part；Upper cushion block（21）Across shell cavity（25）, pass through buckle（26）Mounted on shell cavity（25）Upper end
Upper cushion block（21）Outside.
Preferably, above-mentioned lower cushion block（24）Using A type lower cushion blocks, it is slightly less than rock core equipped with diameter in the A types lower cushion block
（23）The bottom end of the circular channel of median pore diameter, circular channel is equipped with internal thread；A type lower cushion blocks use rubber seal on the outside of bottom end
Circle sealing.
Preferably, above-mentioned lower cushion block（24）Using Type B lower cushion block, circular channel is equipped among the Type B lower cushion block, it is round
The bottom end in channel is equipped with internal thread；Type B lower cushion block uses rubber seal rings for seal on the outside of bottom end；The upper end of Type B lower cushion block
With fluted on section, it is easy to implement flowing of the fluid in core entry end face.
Preferably, above-mentioned heat-shrink tube（22）Outside axial direction and radial transducer are installed respectively, different experiments can be simulated
Condition.
Preferably, above-mentioned rock core（23）Accepted standard is diameter 50mm, and height 25mm, centrally disposed diameter is less than 5mm
Circular hole, the aerofoil profile crack of prefabricated 0.5mm long is distinguished in circular hole both sides.
Preferably, above computer control system（15）Control hydraulic loading system（13）To piston system（8）Pressurization, makes
Upper cushion block（21）With loading equipemtn（7）It contacts and clamps, and pressure is in 2MPa.
The experimental method of the experimental provision of Fracture Toughness of Rocks, technical solution under a kind of measurement low temperature that the present invention mentions
It is：Experimental provision by measuring Fracture Toughness of Rocks under low temperature measures the experimental method of Fracture Toughness of Rocks under low temperature,
Steps are as follows for specific experiment：
（1）Prepare rock core：Rock core standard is diameter 50mm, height 25mm, circular hole of the centrally disposed diameter less than 5mm, circular hole two
The aerofoil profile crack of prefabricated 0.5mm long is distinguished in side, need to ensure that rock core both ends of the surface are substantially parallel to reduce error；
（2）The rock core of experiment is placed in experiment cavity, and experiment cavity is placed on piston system；
（3）It is pressurizeed to piston system using computer control system control hydraulic loading system, cushion block is made to be connect with loading equipemtn
It touches and clamps, pressure is sealed upper cushion block in 2MPa, using buckle；
（4）It opens from supercharging liquid nitrogen container, makes to be full of cryogen in experiment cavity, while the control by controlling fluid recovery tank
Valve maintains the temperature in experiment cavity；
（5）Low-temperature control system is opened, the temperature in the cavity of record experiment in real time；
（6）When temperature is stabilized to experiment setting value, hydraulic pressure system is opened, is applied internal pressure to rock core by computer control system,
Pressure changing is observed, when pressure declines, stops pressurization, record maximal pressure force value P；
（7）The pressure of hydraulic pressure system and hydraulic loading system is unloaded, is closed from supercharging liquid nitrogen container, removal of core, experiment finishes, root
Result calculates the Fracture Toughness of Rocks under the equilibrium temperature according to the experiment.
The experimental method for measuring the experimental provision of Fracture Toughness of Rocks under low temperature that the present invention mentions, by measuring under low temperature
The method that the experimental provision of Fracture Toughness of Rocks measures mechanical properties of rock under low temperature, steps are as follows for experiment：
Using the experimental provision for measuring Fracture Toughness of Rocks under low temperature, lower cushion block is replaced with Type B lower cushion block by A type lower cushion blocks
Afterwards, and on the outside of heat-shrink tube axial direction and radial transducer are installed respectively, different experiment conditions can be simulated, measure different confining pressures,
The intensity of rock under pore pressure and low temperature/condition of ultralow temperature, elasticity modulus, the mechanics parameter of Poisson's ratio, for analysis low temperature/super
The mechanical behavior of rock under cryogenic conditions provides support.
Preferably, steps are as follows for specific experiment of the invention：
（1）Prepare rock core：Rock core standard is diameter 50mm, and the cylinder of height 50mm need to ensure rock core both ends of the surface to reduce error
It is substantially parallel；
（2）The rock core of experiment is clamped by upper cushion block and Type B lower cushion block, heat-shrink tube is wrapped up in outer end, and will measure axially and radially
It after the sensor of displacement is placed on the outside of heat-shrink tube, is placed in experiment cavity, and experiment cavity is placed on piston system, utilize card
Button seals upper cushion block；
（3）It opens from supercharging liquid nitrogen container, makes to be full of cryogen in experiment cavity, simultaneously close off the control valve of fluid recovery tank
Door maintains the temperature and pressure in experiment cavity；
（4）Low-temperature control system is opened, the temperature in the cavity of record experiment in real time；
（5）When temperature is stabilized to experiment setting value, apply hole to rock core using computer control system control hydraulic pressure system
Pressure maintains the pore pressure of setting constant when rock core is fully saturated and reaches the Pore Pressure force value of setting；
（6）It is pressurizeed to piston system using computer control system control hydraulic loading system, until rock core destroys, record is entire
With the axially and radially deformation of the rock core of axial load variation in loading procedure；
（7）The pressure of hydraulic pressure system and hydraulic loading system is unloaded, is closed from supercharging liquid nitrogen container, removal of core, experiment finishes, root
Result calculates related mechanics parameter of the rock core under the conditions of temperature, confining pressure and pore pressure according to the experiment.
Compared with the existing technology, the present invention has following advantageous effect：
（1）, the present invention solve the test problem of rock core fracture toughness under low temperature/condition of ultralow temperature, can more actually simulate
The rupture of rock core under cryogenic, to instructing the field applications such as low temperature hydraulic fracturing to be of great significance；
（2）, realize low temperature environment use from supercharging liquid nitrogen container, cryogenic media can be liquid nitrogen, the low temperature such as liquid carbon dioxide
Fluid not only ensure that cooling safety, but also different low temperature environments can be neatly realized, and cool-down method is simple and fast；
（3）This experimental provision, which only passes through, replaces different lower cushion block, you can while rock is measured under low temperature/ultra-low temperature surroundings not
Vdiverse in function with the mechanical characteristic under confining pressure and pore pressure, easy to operate, experiment is convenient, reduces investment.
Description of the drawings
Fig. 1 is the experimental provision schematic diagram for measuring Fracture Toughness of Rocks under low temperature of the present invention；
Fig. 2 is experiment inside cavity structural schematic diagram；
Fig. 3 is the A type lower cushion block structural schematic diagrams for measuring fracture toughness；
Fig. 4 is the vertical view of A type lower cushion blocks；
Fig. 5 is the Type B lower cushion block structural schematic diagram for measuring mechanics parameter；
Fig. 6 is the vertical view of the tip portion of Type B lower cushion block；
Fig. 7 is the whole vertical view of Type B lower cushion block；
In upper figure, from supercharging liquid nitrogen container 1, the first high pressure heat-preserving pipeline 2, fluid recovery tank 3, the second high pressure heat-preserving pipeline 4, hydraulic pressure
System 5, the first pressure line 6, loading equipemtn 7, piston system 8, experiment cavity 9, first data transmission line 10, the second pressure pipe
Line 11, low-temperature control system 12, hydraulic loading system 13, the second data line 14, computer control system 15, third data
Transmission line 16；
Upper cushion block 21, heat-shrink tube 22, rock core 23, lower cushion block 24, shell cavity 25, buckle 26, rubber seal 27.
Specific implementation mode
Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings, it should be understood that preferred reality described herein
Apply example only for the purpose of illustrating and explaining the present invention and is not intended to limit the present invention.
Embodiment 1, with reference to attached drawing 1-4, the experimental provision of Fracture Toughness of Rocks under a kind of measurement low temperature that the present invention mentions,
Its technical solution is：Including supercharging liquid nitrogen container 1 certainly, liquid nitrogen recycling can 3, hydraulic pressure system 5, experiment cavity 9, low-temperature control system
12, hydraulic loading system 13, computer control system 15,
It is described that 9 bottom end of experiment cavity is passed through by the first high pressure heat-preserving pipeline 2 from supercharging liquid nitrogen container；
Liquid nitrogen recycling can 3 is connected by the second high pressure heat-preserving pipeline 4 with 9 top of experiment cavity, equipped with control on liquid nitrogen recycling can 3
Valve；
One end of hydraulic pressure system 5 passes through loading equipemtn 7 and piston system 8 and experiment 9 bottom end phase of cavity by the first pressure line 6
Even；The other end of hydraulic pressure system 5 is connected by third data line 16 with computer control system 15；
Low-temperature control system 12 is connected by first data transmission line 10 with experiment cavity 9, and 10 one end of first data transmission line is matched
There is temperature sensor；
One end of hydraulic loading system 13 is connected by the second data line 14 with computer control system 15；Hydraulic loaded system
The other end of system 13 is connected across loading equipemtn 7 with piston system 8 by the second pressure line 11；
With reference to attached drawing 2, experiment cavity 9 of the invention includes upper cushion block 21, heat-shrink tube 22, lower cushion block 24, shell cavity 25, buckle
26, rubber seal 27, the shell cavity 25 are placed in 8 upper end of piston system, and rock core 23 is clipped in cushion block 21 and lower cushion block
Between 24, heat-shrink tube 22 be wrapped in rock core 23, the lower part of upper cushion block 21, lower cushion block 24 upper part outside；Upper cushion block 21
Across shell cavity 25, the outside of the upper cushion block 21 of 25 upper end of shell cavity is mounted on by buckle 26.
Signature, lower cushion block 24 use A type lower cushion blocks, and it is straight equipped with diameter to be slightly less than 23 mesoporous of rock core in the A types lower cushion block
The bottom end of the circular channel of diameter, circular channel is equipped with internal thread；A type lower cushion blocks use rubber seal rings for seal on the outside of bottom end.
Preferably, 23 accepted standard of above-mentioned rock core is diameter 50mm, and height 25mm, centrally disposed diameter is less than 5mm's
The aerofoil profile crack of prefabricated 0.5mm long is distinguished in circular hole, circular hole both sides.
Preferably, above computer control system 15 controls hydraulic loading system 13 and pressurizes to piston system 8, makes cushion block
21 contact and clamp with loading equipemtn 7, and pressure is in 2MPa.
The experimental method of the experimental provision of Fracture Toughness of Rocks, technical solution under a kind of measurement low temperature that the present invention mentions
It is：Experimental provision by measuring Fracture Toughness of Rocks under low temperature measures the experimental method of Fracture Toughness of Rocks under low temperature,
Steps are as follows for specific experiment：
（1）Prepare rock core：Rock core standard is diameter 50mm, height 25mm, circular hole of the centrally disposed diameter less than 5mm, circular hole two
The aerofoil profile crack of prefabricated 0.5mm long is distinguished in side, need to ensure that rock core both ends of the surface are substantially parallel to reduce error；
（2）The rock core 23 of experiment is placed in experiment cavity 9, and experiment cavity 9 is placed on piston system 8；
（3）Hydraulic loading system 13 is controlled using computer control system 15 to pressurize to piston system 8, makes cushion block 21 and load
Equipment 7 is contacted and is clamped, and pressure is sealed upper cushion block 21 using buckle 26 in 2MPa；
（4）It opens from supercharging liquid nitrogen container 1, makes to be full of cryogen in experiment cavity 9, while by controlling fluid recovery tank 3
Control valve maintains the temperature in experiment cavity 9；
（5）Low-temperature control system 12 is opened, the temperature in the cavity 9 of record experiment in real time；
（6）When temperature is stabilized to experiment setting value, hydraulic pressure system 5 is opened, is applied to rock core 23 by computer control system 15
Internal pressure observes pressure changing, when pressure declines, stops pressurization, record maximal pressure force value P；
（7）The pressure of hydraulic pressure system 5 and hydraulic loading system 13 is unloaded, is closed from supercharging liquid nitrogen container 1, removal of core 23, experiment
It finishes, the Fracture Toughness of Rocks under the equilibrium temperature is calculated according to experimental result.
Embodiment 2, with reference to attached drawing 1-7, the experiment for measuring Fracture Toughness of Rocks under low temperature that the present invention mentions fills the present invention
The experimental method set, the experimental provision by measuring Fracture Toughness of Rocks under low temperature measure mechanical properties of rock under low temperature
Method, steps are as follows for experiment：
Using the experimental provision for measuring Fracture Toughness of Rocks under low temperature, lower cushion block 24 is replaced with Type B lower cushion block by A type lower cushion blocks
Afterwards, and in 22 outside of heat-shrink tube axial direction and radial transducer are installed respectively, different experiment conditions can be simulated, difference is measured and enclose
The intensity of rock under pressure, pore pressure and low temperature/condition of ultralow temperature, elasticity modulus, the mechanics parameter of Poisson's ratio are low to analyze
The mechanical behavior of rock under temperature/condition of ultralow temperature provides support.
With reference to attached drawing 5-7, circular channel is equipped among Type B lower cushion block of the invention, the bottom end of circular channel is equipped with interior spiral shell
Line；Type B lower cushion block uses rubber seal rings for seal on the outside of bottom end；With fluted on the upper end section of Type B lower cushion block, it is convenient for
Realize flowing of the fluid in core entry end face.In use, axial direction and radial transducer are installed in the outside of heat-shrink tube 22 respectively, it can
Simulate different experiment conditions.
The method that the present invention measures mechanical properties of rock under low temperature, steps are as follows for specific experiment：
（1）Prepare rock core：Rock core standard is diameter 50mm, and the cylinder of height 50mm need to ensure rock core both ends of the surface to reduce error
It is substantially parallel；
（2）The rock core 23 of experiment is clamped by upper cushion block 21 and Type B lower cushion block, heat-shrink tube 22 is wrapped up in outer end, and will measure axial
It after being placed in 22 outside of heat-shrink tube with the sensor of radial displacement, is placed in experiment cavity 9, and experiment cavity 9 is placed in piston system
On system 8, upper cushion block 21 is sealed using buckle 26；
（3）It opens from supercharging liquid nitrogen container 1, makes to be full of cryogen in experiment cavity 9, simultaneously close off the control of fluid recovery tank 3
Valve maintains the temperature and pressure in experiment cavity 9；
（4）Low-temperature control system 12 is opened, the temperature in the cavity 9 of record experiment in real time；
（5）When temperature is stabilized to experiment setting value, controls hydraulic pressure system 5 using computer control system 15 and apply to rock core 23
Pore pressure maintains the pore pressure of setting constant when rock core 23 is fully saturated and reaches the Pore Pressure force value of setting；
（6）Using computer control system 15 control hydraulic loading system 13 to piston system 8 pressurize, until rock core 23 destruction,
Record the axially and radially deformation of the rock core 23 changed with axial load in entire loading procedure；
（7）The pressure of hydraulic pressure system 5 and hydraulic loading system 13 is unloaded, is closed from supercharging liquid nitrogen container 1, removal of core has been tested
Finish, related mechanics parameter of the rock core 23 under the conditions of the temperature, confining pressure and pore pressure is calculated according to experimental result.
This experimental provision is only by replacing different lower cushion blocks, you can while measuring rock under low temperature/ultra-low temperature surroundings and existing
Mechanical characteristic under different confining pressures and pore pressure, vdiverse in function, easy to operate, experiment is convenient, reduces investment.
The above, is only the part preferred embodiment of the present invention, and any technical person familiar with the field may profit
Equivalent technical solution is changed or is revised as with the technical solution of above-mentioned elaboration.Therefore, technology according to the present invention
Any simple modification or substitute equivalents that scheme is carried out, belong to the greatest extent the scope of protection of present invention.
Claims (9)
1. a kind of experimental provision measuring Fracture Toughness of Rocks under low temperature, it is characterized in that：Including supercharging liquid nitrogen container certainly（1）, liquid nitrogen
Recycling can（3）, hydraulic pressure system（5）, experiment cavity（9）, low-temperature control system（12）, hydraulic loading system（13）, computer control
System processed（15）,
It is described to pass through the first high pressure heat-preserving pipeline from supercharging liquid nitrogen container（2）Across experiment cavity（9）Bottom end；
Liquid nitrogen recycling can（3）Pass through the second high pressure heat-preserving pipeline（4）With experiment cavity（9）Top is connected, liquid nitrogen recycling can（3）On
Equipped with control valve；
Hydraulic pressure system（5）One end pass through the first pressure line（6）Across loading equipemtn（7）And piston system（8）With experiment chamber
Body（9）Bottom end is connected；Hydraulic pressure system（5）The other end pass through third data line（16）With computer control system（15）Phase
Even；
Low-temperature control system（12）Pass through first data transmission line（10）With experiment cavity（9）It is connected, first data transmission line
（10）It is furnished with temperature sensor in one end；
Hydraulic loading system（13）One end pass through the second data line（14）With computer control system（15）It is connected；Hydraulic pressure
Loading system（13）The other end pass through the second pressure line（11）Across loading equipemtn（7）With piston system（8）It is connected；
The experiment cavity（9）Including upper cushion block（21）, heat-shrink tube（22）, lower cushion block（24）, shell cavity（25）, buckle
（26）, rubber seal（27）, the shell cavity（25）It is placed in piston system（8）Upper end, rock core（23）It is clipped in cushion block
（21）And lower cushion block（24）Between, heat-shrink tube（22）It is wrapped in rock core（23）, upper cushion block（21）Lower part, lower cushion block（24）'s
The outside of upper part；Upper cushion block（21）Across shell cavity（25）, pass through buckle（26）Mounted on shell cavity（25）Upper end
Upper cushion block（21）Outside.
2. the experimental provision according to claim 1 for measuring Fracture Toughness of Rocks under low temperature, it is characterized in that：The lower cushion block
（24）Using A type lower cushion blocks, it is slightly less than rock core equipped with diameter in the A types lower cushion block（23）The circular channel of median pore diameter, circle
The bottom end in shape channel is equipped with internal thread；A type lower cushion blocks use rubber seal rings for seal on the outside of bottom end.
3. the experimental provision according to claim 1 for measuring Fracture Toughness of Rocks under low temperature, it is characterized in that：The lower cushion block
（24）Using Type B lower cushion block, circular channel is equipped among the Type B lower cushion block, the bottom end of circular channel is equipped with internal thread；Type B
Lower cushion block uses rubber seal rings for seal on the outside of bottom end；With fluted on the upper end section of Type B lower cushion block, it is easy to implement stream
Flowing of the body in core entry end face.
4. the experimental provision according to claim 3 for measuring Fracture Toughness of Rocks under low temperature, it is characterized in that：The heat-shrink tube
（22）Outside axial direction and radial transducer are installed respectively, different experiment conditions can be simulated.
5. the experimental provision according to claim 1 for measuring Fracture Toughness of Rocks under low temperature, it is characterized in that：The rock core
（23）Accepted standard is diameter 50mm, and height 25mm, circular hole of the centrally disposed diameter less than 5mm, circular hole both sides are distinguished prefabricated
The aerofoil profile crack of 0.5mm long.
6. the experimental provision according to claim 1 for measuring Fracture Toughness of Rocks under low temperature, it is characterized in that：The computer
Control system（15）Control hydraulic loading system（13）To piston system（8）Pressurization, makes cushion block（21）With loading equipemtn（7）It connects
It touches and clamps, and pressure is in 2MPa.
7. a kind of experiment side for measuring the experimental provision of Fracture Toughness of Rocks under low temperature as described in any one of claim 1-6
Method, it is characterized in that：Experimental provision by measuring Fracture Toughness of Rocks under low temperature measures Fracture Toughness of Rocks under low temperature
Experimental method, steps are as follows for specific experiment：
（1）Prepare rock core：Rock core standard is diameter 50mm, height 25mm, circular hole of the centrally disposed diameter less than 5mm, circular hole two
The aerofoil profile crack of prefabricated 0.5mm long is distinguished in side, need to ensure that rock core both ends of the surface are substantially parallel to reduce error；
（2）By the rock core of experiment（23）It is placed in experiment cavity（9）It is interior, and cavity will be tested（9）It is placed in piston system（8）On；
（3）Utilize computer control system（15）Control hydraulic loading system（13）To piston system（8）Pressurization, makes cushion block
（21）With loading equipemtn（7）It contacts and clamps, pressure utilizes buckle in 2MPa（26）By upper cushion block（21）Sealing；
（4）It opens from supercharging liquid nitrogen container（1）, make experiment cavity（9）It is interior to be full of cryogen, while by controlling fluid recovery tank
（3）Control valve, maintain experiment cavity（9）Interior temperature；
（5）Open low-temperature control system（12）, the cavity of record experiment in real time（9）Interior temperature；
（6）When temperature is stabilized to experiment setting value, hydraulic pressure system is opened（5）, by computer control system（15）To rock core
（23）It applies internal pressure, observes pressure changing, when pressure declines, stop pressurization, record maximal pressure force value P；
（7）Unload hydraulic pressure system（5）And hydraulic loading system（13）Pressure, close from supercharging liquid nitrogen container（1）, removal of core
（23）, experiment finishes, and the Fracture Toughness of Rocks under the equilibrium temperature is calculated according to experimental result.
8. a kind of experiment side for measuring the experimental provision of Fracture Toughness of Rocks under low temperature as described in any one of claim 1-6
Method, it is characterized in that：Experimental provision by measuring Fracture Toughness of Rocks under low temperature measures mechanical properties of rock under low temperature
Method, steps are as follows for experiment：
Using the experimental provision for measuring Fracture Toughness of Rocks under low temperature, by lower cushion block（24）Type B underlay is replaced with by A type lower cushion blocks
After block, and in heat-shrink tube（22）Axial direction and radial transducer are installed in outside respectively, can simulate different experiment conditions, measure different
The intensity of rock under confining pressure, pore pressure and low temperature/condition of ultralow temperature, elasticity modulus, the mechanics parameter of Poisson's ratio are low to analyze
The mechanical behavior of rock under temperature/condition of ultralow temperature provides support.
9. the experimental method according to claim 8 for measuring the experimental provision of Fracture Toughness of Rocks under low temperature, it is characterized in that：
Steps are as follows for specific experiment：
（1）Prepare rock core：Rock core standard is diameter 50mm, and the cylinder of height 50mm need to ensure rock core both ends of the surface to reduce error
It is substantially parallel；
（2）By the rock core of experiment（23）By upper cushion block（21）It is clamped with Type B lower cushion block, heat-shrink tube is wrapped up in outer end（22）, and will survey
The sensor for measuring axially and radially displacement is placed in heat-shrink tube（22）Behind outside, it is placed in experiment cavity（9）It is interior, and cavity will be tested
（9）It is placed in piston system（8）On, utilize buckle（26）By upper cushion block（21）Sealing；
（3）It opens from supercharging liquid nitrogen container（1）, make experiment cavity（9）It is interior to be full of cryogen, simultaneously close off fluid recovery tank（3）
Control valve, maintain experiment cavity（9）Interior temperature and pressure；
（4）Open low-temperature control system（12）, the cavity of record experiment in real time（9）Interior temperature；
（5）When temperature is stabilized to experiment setting value, computer control system is utilized（15）Control hydraulic pressure system（5）To rock core
（23）Apply pore pressure, works as rock core（23）When being fully saturated and reaching the Pore Pressure force value of setting, the Pore Pressure of setting is maintained
Power is constant；
（6）Utilize computer control system（15）Control hydraulic loading system（13）To piston system（8）Pressurization, until rock core
（23）It destroys, records the rock core changed with axial load in entire loading procedure（23）Axially and radially deformation；
（7）Unload hydraulic pressure system（5）And hydraulic loading system（13）Pressure, close from supercharging liquid nitrogen container（1）, removal of core,
Experiment finishes, and rock core is calculated according to experimental result（23）Related mechanics parameter under the conditions of the temperature, confining pressure and pore pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810501247.XA CN108709815B (en) | 2018-05-23 | 2018-05-23 | Experimental device and method for measuring fracture toughness of rock at low temperature |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810501247.XA CN108709815B (en) | 2018-05-23 | 2018-05-23 | Experimental device and method for measuring fracture toughness of rock at low temperature |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108709815A true CN108709815A (en) | 2018-10-26 |
| CN108709815B CN108709815B (en) | 2021-03-23 |
Family
ID=63868479
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810501247.XA Active CN108709815B (en) | 2018-05-23 | 2018-05-23 | Experimental device and method for measuring fracture toughness of rock at low temperature |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108709815B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109612700A (en) * | 2018-12-11 | 2019-04-12 | 东南大学 | Components Performance Test System under deep cooling hyperbaric environment |
| CN111175329A (en) * | 2020-01-16 | 2020-05-19 | 中国石油大学(北京) | In-situ observation method for microstructure of liquid nitrogen frozen rock |
| CN112414882A (en) * | 2020-10-10 | 2021-02-26 | 武汉大学 | High-temperature crystalline rock cold impact cracking experiment system and method |
| CN114184486A (en) * | 2021-12-08 | 2022-03-15 | 西南科技大学 | Device and method for measuring fracture toughness of rock under high-temperature and high-pressure conditions |
| CN114428047A (en) * | 2020-09-29 | 2022-05-03 | 中国石油化工股份有限公司 | Device and method for fracturing shale by ultralow-temperature carbon dioxide through multiple rounds of huffing and puff |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103278428A (en) * | 2013-05-10 | 2013-09-04 | 东北大学 | Device and method for gas bearing shale-seepage-temperature coupling and displacement experiment |
| CN105067450A (en) * | 2015-08-12 | 2015-11-18 | 中国石油大学(华东) | Device and method for measuring Biot coefficient of poroelastic medium under high temperature and high pressure |
| CN105136837A (en) * | 2015-07-24 | 2015-12-09 | 中国矿业大学 | Test system and test method of liquid nitrogen circulation freeze-thawing permeability-increasing simulation of coal rock sample |
| CN105890998A (en) * | 2016-04-22 | 2016-08-24 | 中国科学院武汉岩土力学研究所 | Rock fracturing simulation test specimen with crack, preparation method for rock fracturing simulation test specimen, simulation test apparatus and simulation test method |
| CN106769767A (en) * | 2016-12-26 | 2017-05-31 | 中国石油大学(华东) | The measurement apparatus and method of a kind of anisotropic rock permeability and elastic modelling quantity |
| CN206531731U (en) * | 2017-02-22 | 2017-09-29 | 中国石油大学(北京) | The experimental provision of Fracture Toughness of Rocks is tested under the conditions of a kind of pore pressure |
| CN206990340U (en) * | 2017-07-19 | 2018-02-09 | 中国石油大学(北京) | A kind of supercritical carbon dioxide rock core pressure break clamper under pore pressure saturation |
| CN107941621A (en) * | 2017-11-16 | 2018-04-20 | 中国石油集团川庆钻探工程有限公司 | A kind of rock true triaxial hydraulic fracturing emergent property test device |
-
2018
- 2018-05-23 CN CN201810501247.XA patent/CN108709815B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103278428A (en) * | 2013-05-10 | 2013-09-04 | 东北大学 | Device and method for gas bearing shale-seepage-temperature coupling and displacement experiment |
| CN105136837A (en) * | 2015-07-24 | 2015-12-09 | 中国矿业大学 | Test system and test method of liquid nitrogen circulation freeze-thawing permeability-increasing simulation of coal rock sample |
| CN105067450A (en) * | 2015-08-12 | 2015-11-18 | 中国石油大学(华东) | Device and method for measuring Biot coefficient of poroelastic medium under high temperature and high pressure |
| CN105890998A (en) * | 2016-04-22 | 2016-08-24 | 中国科学院武汉岩土力学研究所 | Rock fracturing simulation test specimen with crack, preparation method for rock fracturing simulation test specimen, simulation test apparatus and simulation test method |
| CN106769767A (en) * | 2016-12-26 | 2017-05-31 | 中国石油大学(华东) | The measurement apparatus and method of a kind of anisotropic rock permeability and elastic modelling quantity |
| CN206531731U (en) * | 2017-02-22 | 2017-09-29 | 中国石油大学(北京) | The experimental provision of Fracture Toughness of Rocks is tested under the conditions of a kind of pore pressure |
| CN206990340U (en) * | 2017-07-19 | 2018-02-09 | 中国石油大学(北京) | A kind of supercritical carbon dioxide rock core pressure break clamper under pore pressure saturation |
| CN107941621A (en) * | 2017-11-16 | 2018-04-20 | 中国石油集团川庆钻探工程有限公司 | A kind of rock true triaxial hydraulic fracturing emergent property test device |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109612700A (en) * | 2018-12-11 | 2019-04-12 | 东南大学 | Components Performance Test System under deep cooling hyperbaric environment |
| CN111175329A (en) * | 2020-01-16 | 2020-05-19 | 中国石油大学(北京) | In-situ observation method for microstructure of liquid nitrogen frozen rock |
| CN114428047A (en) * | 2020-09-29 | 2022-05-03 | 中国石油化工股份有限公司 | Device and method for fracturing shale by ultralow-temperature carbon dioxide through multiple rounds of huffing and puff |
| CN112414882A (en) * | 2020-10-10 | 2021-02-26 | 武汉大学 | High-temperature crystalline rock cold impact cracking experiment system and method |
| CN114184486A (en) * | 2021-12-08 | 2022-03-15 | 西南科技大学 | Device and method for measuring fracture toughness of rock under high-temperature and high-pressure conditions |
| CN114184486B (en) * | 2021-12-08 | 2023-12-12 | 西南科技大学 | Rock fracture toughness measuring device and method under high-temperature and high-pressure conditions |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108709815B (en) | 2021-03-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108709815A (en) | Measure the experimental provision and method of Fracture Toughness of Rocks under low temperature | |
| Liu et al. | Effects of gas pressure on bursting liability of coal under uniaxial conditions | |
| CN104655495B (en) | High temperature and high pressure coal and rock true triaxial fracturing and seepage test device and test method | |
| CN111272576A (en) | Novel true triaxial fracturing seepage test device and method | |
| George et al. | The change in effective stress associated with shrinkage from gas desorption in coal | |
| Harpalani et al. | Impact of CO 2 injection on flow behavior of coalbed methane reservoirs | |
| CN110006738B (en) | Rock brittleness evaluation method based on stress-strain curve and scratch test | |
| Fan et al. | Evaluation of permeability damage for stressed coal with cyclic loading: an experimental study | |
| Hu et al. | Effects of gas adsorption on mechanical properties and erosion mechanism of coal | |
| CN110926941B (en) | Shale brittleness index evaluation method, device and system | |
| Xie et al. | Gas flow characteristics of coal samples with different levels of fracture network complexity under triaxial loading and unloading conditions | |
| NO178480B (en) | Method and cell for examination of drill sample by cooling | |
| CN110018057A (en) | A kind of microseism-shear-seepage coupling test device and test method | |
| Li et al. | Experimental and numerical investigation of the failure mechanism and permeability evolution of sandstone based on hydro-mechanical coupling | |
| CN105067450B (en) | Measure the device and method of poroelastic medium Biot coefficient under High Temperature High Pressure | |
| CN105424331A (en) | Device and method for mechanical sealing evaluation of cement ring when large fracturing is performed | |
| KR101814020B1 (en) | Current Hydraulic Fracturing System for Applying Differential Stress | |
| CN108663498B (en) | High-temperature depressurization and fracturing shale gas field desorption experimental device and method | |
| CN112945827A (en) | Rock dynamic physical property measuring system | |
| Wang et al. | Design of experimental system for supercritical CO2 fracturing under confining pressure conditions | |
| KR101814019B1 (en) | Current Hydraulic Fracturing System for Applying Differential Stress | |
| Ye et al. | A new device for measuring the supercritical CO2 permeability in porous rocks under reservoir conditions | |
| Liang et al. | An experimental and numerical study on acoustic emission in the process of rock damage at different stress paths | |
| Wang et al. | A study of the coupling between mechanical loading and flow properties in tuffaceous rock | |
| CN209327131U (en) | A kind of three axis of coal petrography destruction experimental apparatus for testing |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |