CN115143928B - Strain probe calibration system and method for simulating high-temperature and high-pressure environment - Google Patents
Strain probe calibration system and method for simulating high-temperature and high-pressure environment Download PDFInfo
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- CN115143928B CN115143928B CN202211075638.2A CN202211075638A CN115143928B CN 115143928 B CN115143928 B CN 115143928B CN 202211075638 A CN202211075638 A CN 202211075638A CN 115143928 B CN115143928 B CN 115143928B
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Abstract
The invention discloses a system and a method for calibrating a strain probe simulating a high-temperature and high-pressure environment, wherein the system for calibrating the strain probe comprises: the device comprises a pressure chamber module (1) for simulating a high-temperature and high-pressure environment, acquiring a temperature pressure signal, a core deformation signal and a core acoustic emission signal, a servo pressure adjusting module (2) for adjusting the temperature and the pressure of the pressure chamber module (1) and providing various stable high-temperature and high-pressure environments, an electronic control display module (3) for receiving, processing and displaying temperature, pressure, core deformation and acoustic emission data, sending a control instruction and finishing the calibration of a strain probe, a cooling module (4) for executing the temperature adjusting instruction and a transmission module; the device can realize the simulation of various high-temperature and high-pressure environments by independently adjusting the temperature and the pressure, research the influence of the temperature and the pressure on the measurement result, measure the internal change of the rock sample in the loading process, realize the calibration of the strain probe, and have higher measurement accuracy by adopting an instrument pressurization mode.
Description
Technical Field
The invention belongs to the technical field of geotechnical surveying, and particularly relates to a strain probe calibration system and method for simulating a high-temperature and high-pressure environment.
Background
The ground stress is a stress in a rock mass, and is not only a main factor for evaluating the geological environment and the stability of the crust, but also one of important data of geological engineering and construction. The most widely used ground stress in-situ measuring method in engineering at present is an indirect measurement ground stress hydraulic fracturing method and a stress relief method. Taking a hydraulic fracturing method as an example, firstly taking a section of exposed drilling hole of bedrock during measurement, and sealing the upper end and the lower end by using a packer; then the liquid is injected, pressurized until the walls of the hole are ruptured, and the pressure change with time is recorded and the rupture orientation is observed with an impression tool or a downhole television. And calculating the magnitude and direction of the in-situ main stress by using a corresponding formula according to the recorded fracture pressure, pump-off pressure and fracture azimuth. However, the hydraulic fracturing technology reinjects the waste water to the stratum to cause a slight earthquake, great influence is caused on the environment if transportation is lost, the cost of the method for calculating the main stress by measuring the fracture pressure and the like is too high, and high cost requirements are imposed on the environment and equipment. And the stress relieving method firstly measures the strain relieving value of the surface of the rock core in the relieving process through the strain gauge, and then deduces the initial ground stress state by utilizing the constitutive equation which brings the measured strain relieving value into the original rock stress state and the relation between the hole wall stress and the far-field ground stress. Therefore, how to accurately measure the strain value is the key of the stress relieving method, and the conventional strain measurement is to directly attach the strain gauge to the place to be measured, but is difficult to apply in many cases, and the conventional strain gauge measurement method has the following key technical problems to be solved:
(1) The requirement on the test precision is high, and the strain gauge is easy to damage: the high-precision strain gauge is used as a precise electronic component, is easy to cause mechanical system damage in the process of being taken down after being repeatedly pasted, and is very easy to be damaged by rock debris existing in drilling fluid and irregular hole walls when petroleum exists in drilling wells;
(2) The strain gauge is difficult to adhere to the surface of a well wall under complex drilling conditions due to the high-temperature and high-pressure hydraulic environment, the success rate of the strain gauge is low, the temperature drift of the strain gauge exists, and the strain measurement value is distorted under the high-temperature drilling conditions;
(3) The requirement on automation is high, and due to the fact that continuous sampling cannot be directly conducted, the strain gauge needs to be pasted again facing different sampling sections, and time and labor are wasted.
Therefore, in a complex deep drilling environment, the strain gauge needs to be packaged into a special probe to carry out testing, and the strain measurement probe needs to be calibrated in order to guarantee the accuracy of a test value.
Patent CN 107101875A provides a general type high pressure confining pressure rating appearance of empty pericardium ground stress measurement self sealss multicaliber, contain back of the body two recess general type self sealss high strength polyurethane rubber leather sheath in the cabin, it is full of between the leather sheath and the high pressure confining pressure rating appearance cabin body through hydraulic oil, experimental rock specimen is put and is extruded in back of the body two recess polyurethane rubber leather sheath, realize confining pressure 80 MPa's steady loading, through the confining pressure size in the pressurization system real-time supervision high pressure confining pressure rating appearance. But the device can not simulate the influence of the temperature under the high-temperature environment on the measurement result; secondly, other means for measuring the internal change of the rock sample in the loading process are lacked; the strain probe cannot be calibrated; the manual pressurization causes large fluctuation, and thus measurement errors occur.
Disclosure of Invention
Aiming at the defects or the improvement requirements of the prior art, the invention provides a strain probe calibration system and a strain probe calibration method for simulating a high-temperature and high-pressure environment, which can realize the simulation of various high-temperature and high-pressure environments by automatically adjusting temperature and pressure, study the influence of the temperature and the pressure on a measurement result, measure the internal change of a rock sample in a loading process and realize the calibration of a strain probe.
To solve the above problem, according to an aspect of the present invention, an embodiment of the present invention provides a strain probe calibration system for simulating a high-temperature and high-pressure environment, including: the system comprises a pressure chamber module, a servo pressure adjusting module, an electric control display module, a cooling module and a transmission module, wherein the pressure chamber module is used for simulating a high-temperature high-pressure environment, acquiring a temperature pressure signal, a core deformation signal and a core acoustic emission signal, the servo pressure adjusting module is used for adjusting the temperature and the pressure of the pressure chamber module and providing various stable high-temperature high-pressure environments, the electric control display module is used for receiving, processing and displaying temperature, pressure, core deformation and acoustic emission data, sending a control instruction and completing the calibration of a strain probe, the cooling module is used for executing the temperature adjusting instruction, and the transmission module is used for transmitting data and serving as a hydraulic oil transmission channel;
the transmission module includes: oil pipes and electrical wires;
the pressure chamber module, the servo pressure adjusting module and the cooling module are mutually in oil circuit connection through the oil pipe;
the electric control display module is respectively in circuit connection with the pressure chamber module, the servo pressure adjusting module and the cooling module through the electric wires.
Further, the pressure chamber module includes: the cavity, arrange in heating rod in the cavity, arrange in rock core in the cavity, paste in the strain transducer of rock core one end, paste in the foil gage of the rock core other end, respectively will the heating rod strain transducer the foil gage with the high temperature and high pressure resistant electric wire of automatically controlled display module circuit connection.
Further, the servo pressure adjustment module includes: the oil cavity, locate hydraulic sensor in the oil cavity, connect hydraulic sensor with high temperature and high pressure resistant electric wire and with the solenoid valve of oil cavity intercommunication, the solenoid valve with oil pipe intercommunication.
Further, the cooling module includes: the cooling module comprises a cooling module shell, a cooling module upper end cover and a cooling module lower end cover which are fixed on the cooling module shell, a water cooling unit, a cooling module oil cavity, oil line interfaces, a temperature and pressure sensor and circuit interfaces, wherein the two ends of the water cooling unit are respectively fixed on the cooling module upper end cover and the cooling module lower end cover;
the temperature and pressure sensor is connected with the electronic control display module through an electric wire.
Further, the shape of the water cooling unit is a combination of a plurality of V shapes;
further, the electronic control display module comprises: the system comprises a data acquisition unit for receiving data acquired by sensors and measuring equipment, a computer for setting user parameters and displaying the data acquired by the sensors, the running state of each working component, real-time calibration and data recording of a strain probe, and a control unit for generating instructions according to data processing results and parameters set by an operator;
the data acquisition unit, the computer and the control unit are in communication connection with each other.
Furthermore, the data acquisition unit is respectively in communication connection with the temperature and pressure sensor, the hydraulic sensor, the strain sensor and the acoustic emission testing equipment;
further, the control unit is in communication connection with the heating rod and the electromagnetic valve.
According to another aspect of the present invention, an embodiment of the present invention provides a method for calibrating a strain probe simulating a high-temperature and high-pressure environment, including:
s100, preparing a rock core sample, mounting a sensor on the rock core, and mounting the rock core on a pressure chamber module 1, a connecting line and an oil way of a calibration device;
specifically, the installation sensor on the core includes: a strain probe is pasted at the center of one end of the core, strain rosettes (formed by combining a plurality of strain gauges and used for measuring a strain field) are pasted at symmetrical positions of the other end of the core, and the direction of the strain rosettes in the strain probe is completely consistent with that of the strain rosettes on the other side; after the sticking is finished, the rock core is sleeved into a special rubber sleeve, and an acoustic emission testing device is fixed on the outer side.
Specifically, the core installation comprises: and placing the core in the center of the pressure chamber module, communicating the circuits of the strain sensor, the temperature and pressure sensor, the acoustic emission testing equipment and the like with the circuit interfaces of the upper end cover and the lower end cover of the pressure chamber, closing the upper end cover and the lower end cover of the pressure chamber, and connecting the upper end cover and the lower end cover of the pressure chamber into an oil pipe.
S200, starting the electric control display module and the servo pressure adjusting module, and starting to inject hydraulic oil into the pressure chamber module;
s300, setting temperature and pressure, starting each sensor, starting loading according to a preset loading sequence, and automatically calibrating and calculating by a computer according to critical information such as strain, acoustic emission data, temperature and pressure and the like recorded by the sensors;
specifically, the setting the temperature and the pressure includes: the temperature is room temperature, the pressure is set to be gradually increased in a loading sequence, and the loading sequence of the pressure is 1Mpa to 50MPa.
S400, repeating the step S300, gradually increasing the temperature, recording analysis data, and obtaining a calibration curve and a temperature drift curve of the strain probe.
Specifically, the temperature range is room temperature +10 ℃ to +80 ℃.
Further, the installing a sensor on the core comprises: a strain probe is pasted at the center of one end of the core, a strain flower is pasted at the symmetrical position of the other end of the core, the strain flower is formed by combining a plurality of strain gauges and used for measuring a strain field, and the direction of the strain flower in the strain probe is completely consistent with that of the strain flower at the other side; after the sticking is finished, the core is sleeved into the special rubber sleeve, and the acoustic emission testing equipment is fixed on the outer side.
The core installation includes: and placing the core in the center of the pressure chamber module, communicating the circuits of detection units such as a strain sensor, a temperature and pressure sensor, an acoustic emission test device and the like with the circuit interfaces of the upper end cover and the lower end cover of the pressure chamber, closing the upper end cover and the lower end cover of the pressure chamber, and connecting the upper end cover and the lower end cover of the pressure chamber into an oil pipe.
In general, compared with the prior art, the above technical solutions conceived by the present invention can achieve the following beneficial effects:
1. the invention relates to a strain probe calibration system, when equipment runs, a rock core is placed into a pressure chamber module, an electronic control display module acquires data from the pressure chamber module, an operator sets pressure and temperature according to needs, hydraulic oil can circularly flow among the servo pressure regulation module, a cooling module and the pressure chamber module under the control of the servo pressure regulation module, the electronic control display module can regulate and control pressure by controlling a valve switch arranged on the servo pressure regulation module, the pressure chamber module can automatically heat up, when the temperature needs to be reduced, high-temperature oil in the pressure chamber module is conveyed to the cooling module through the servo pressure regulation module, low-temperature oil in the cooling module is conveyed to the pressure chamber module to realize the temperature regulation of the pressure chamber module, the pressure chamber module can also collect temperature and pressure signals, rock core deformation signals and rock core acoustic emission signals and transmit the signals to the electronic control display module, and the electronic control display module processes data and displays temperature, pressure, rock core deformation and acoustic emission data, and completes the calibration of the corresponding strain probe. The embodiment of the invention can realize the simulation of various high-temperature and high-pressure environments by automatically adjusting the temperature and the pressure, study the influence of the temperature and the pressure on the measurement result, measure the internal change of the rock sample in the loading process, realize the calibration of the strain probe and realize more accurate measurement by adopting an instrument pressurization mode.
2. According to the strain probe calibration system, the electric control display module regulates hydraulic oil to flow among the servo pressure regulation module, the cooling module and the pressure chamber module by controlling the on-off of the electromagnetic valve, under the control of the electric control display module, the electromagnetic valve can convey more hydraulic oil to the pressure chamber module to provide a high-pressure environment, and can also pump the hydraulic oil back into the oil cavity to reduce the pressure of the pressure chamber module, when the pressure in the pressure chamber module reaches the required target pressure in the electric control display module, and when the hydraulic sensor of the servo pressure regulation module monitors that the pressure in the oil cavity is stable at the moment, the electromagnetic valve is controlled to be closed, and the operation is completed. In addition, the electromagnetic valve extracts high-temperature hydraulic oil of the pressure chamber module and conveys the high-temperature hydraulic oil to the cooling module, and conveys low-temperature hydraulic oil in the cooling module to the pressure chamber module, so that the temperature of the pressure chamber module can be regulated. The servo pressure adjusting module 2 controls the hydraulic oil to flow among the servo pressure adjusting module, the cooling module and the pressure chamber module through the electromagnetic valve, so that the temperature and the pressure in the pressure chamber module can be regulated, various stable high-temperature and high-pressure environments can be provided for the pressure chamber module, and the accurate calibration of the strain probe is realized.
3. According to the strain probe calibration system, when the temperature of the pressure chamber needs to be reduced, the electromagnetic valve of the servo pressure regulation module is opened, low-temperature oil in the cooling module is injected into the pressure chamber module, high-temperature oil in the pressure chamber module is conveyed back into the oil cavity of the cooling module, and the water cooling unit rapidly reduces the oil temperature through water circulation. The shape of the water cooling unit is a combination of a plurality of V shapes to increase the contact area of the cooling water and the hydraulic oil, so that the hydraulic oil can be rapidly cooled.
4. According to the strain probe calibration method, the strain data of the strain probe in the preset pressure increasing process at room temperature are measured, the temperature is gradually increased, the strain data of the strain probe in the preset pressure increasing process of the strain probe are measured, the temperature drift curve of the strain probe is obtained, calibration of strain test results of the strain probe at different temperatures is achieved, and the strain probe measurement result is more accurate during actual measurement.
Drawings
FIG. 1 is a schematic structural diagram of a strain probe calibration system for simulating a high-temperature and high-pressure environment according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a pressure chamber module according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a cooling module according to an embodiment of the present invention;
FIG. 4 is a flow chart of strain probe calibration according to an embodiment of the present invention;
throughout the drawings, like reference numerals designate like features, and in particular: 1-pressure chamber module, 2-servo pressure adjusting module, 3-electric control display module, 4-cooling module, 5-oil pipe, 6-electric wire, 7-pressure chamber upper end cover, 8-pressure chamber lower end cover, 9-pressure chamber shell, 10-vacuum thermal insulation layer, 11-pressure chamber inner wall, 12-circuit interface, 13-oil path interface, 14-high strength bolt, 15-sealing ring, 16-rock core, 17-strain sensor, 18-strain sheet, 19-rubber sleeve, 20-high temperature and high pressure resistant electric wire, 21-acoustic emission testing equipment, 22-heating rod, 23-temperature pressure sensor, 24-cooling module upper end cover, 25-cooling module lower end cover, 26-cooling module shell, 27-cooling oil cavity module and 28-water cooling unit.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
As shown in figure 1, the invention provides a strain probe calibration system for simulating a high-temperature and high-pressure environment, which comprises a pressure chamber module 1 for simulating the high-temperature and high-pressure environment, acquiring temperature and pressure signals, acquiring core deformation signals and acquiring core acoustic emission signals, a servo pressure adjusting module 2 for adjusting the temperature and pressure of the pressure chamber module 1, providing various stable high-temperature and high-pressure environments, an electronic control display module 3 for receiving, processing and displaying temperature, pressure, core deformation and acoustic emission data, sending control instructions and completing strain probe calibration, a cooling module 4 for executing the temperature adjusting instructions, and a transmission module for transmitting data and serving as a hydraulic oil transmission channel. The pressure chamber module 1, the servo pressure regulating module 2 and the cooling module 4 are in oil-circuit connection with each other by means of a transmission module. The electronic control display module 3 is respectively connected with the pressure chamber module 1, the servo pressure adjusting module 2 and the cooling module 4 through circuits. When the device is operated, a rock core is placed into the pressure chamber module 1, the electronic control display module 3 acquires data from the pressure chamber module 1, an operator sets pressure and temperature as required, hydraulic oil can circularly flow among the servo pressure adjusting module 2, the cooling module 4 and the pressure chamber module 1 under the control of the servo pressure adjusting module 2, the electronic control display module 3 can control and control pressure through controlling a valve switch arranged on the servo pressure adjusting module 2, the pressure chamber module 1 can automatically heat up, when the temperature needs to be reduced, high-temperature oil in the pressure chamber module 1 is conveyed to the cooling module 4 through the servo pressure adjusting module 2, low-temperature oil in the cooling module 4 is conveyed to the pressure chamber module 1, the temperature of the pressure chamber module 1 is adjusted, the pressure chamber module 1 can also collect temperature pressure signals, rock core deformation signals and rock core sound emission signals and transmit the temperature pressure signals to the electronic control display module 3, the electronic control display module 3 processes data and displays temperature, pressure, rock core deformation and sound emission data, and completes calibration of a corresponding variable probe. The embodiment of the invention can realize the simulation of various high-temperature and high-pressure environments by automatically adjusting the temperature and the pressure, study the influence of the temperature and the pressure on the measurement result, measure the internal change of the rock sample in the loading process, realize the calibration of the strain probe and realize more accurate measurement by adopting an instrument pressurization mode.
The transmission module comprises an oil pipe 5 and an electric wire 6, the oil pipe 5 is connected with the pressure chamber module 1 and the servo pressure adjusting module 2, the servo pressure adjusting module 2 and the cooling module 4, the cooling module 4 and the pressure chamber module 1, and the electric wire 6 is used for connecting the electric control display module 3 with the sensors and the like on the pressure chamber module 1, the servo pressure adjusting module 2 and the cooling module 4 to regulate and control the operation of each part.
As shown in fig. 2, the pressure chamber module 1 includes a pressure chamber upper end cover 7, a pressure chamber lower end cover 8, a pressure chamber housing 9, a vacuum thermal insulation layer 10, a pressure chamber inner wall 11, a circuit interface 12, an oil passage interface 13, a high-strength bolt 14, a seal ring 15, a core 16, a strain sensor 17, a strain gauge 18, a rubber sleeve 19, a high-temperature and high-voltage resistant wire 20, an acoustic emission testing device 21, a heating rod 22, and a temperature and pressure sensor 23. The pressure chamber comprises a pressure chamber upper end cover 7 and a pressure chamber lower end cover 8 which are fixed on a pressure chamber shell 9 through bolts, a vacuum thermal insulation layer 10 is arranged between the pressure chamber shell 9 and a pressure chamber inner wall 11, circuit interfaces 12 and oil circuit interfaces 13 provided with sealing rings 15 are arranged on two sides of a pressure chamber module 1, the oil circuit interfaces 13 are respectively connected with a servo pressure adjusting module 2 and a cooling module 4 through oil pipes 5, a cavity is arranged in the pressure chamber module 1, a rock core 16 is arranged in the cavity, a rubber sleeve 19 is sleeved on the rock core 16, a strain sensor 17 is pasted at one end of the rock core 16, a strain foil 18 is pasted at one end of the rock core 16, the strain foil is connected with an electronic control display module 3 through the circuit interface 12 through which a high-temperature and high-pressure resistant wire 20 passes, a temperature and high-pressure resistant wire 20 is connected with the electronic control display module 3 through the circuit interface 12 through which the high-temperature and high-pressure resistant wire 20 passes one side, a heating rod 22 is connected with the high-temperature and high-pressure resistant wire 20, and the high-temperature and high-pressure resistant wire 20 passes through the circuit interface 12 through which the other side to be connected with the electronic control display module 3. When the pressure chamber module 1 works, the electronic control display module 3 transmits an instruction to the servo pressure adjusting module 2, the servo pressure adjusting module 2 conveys hydraulic oil to the pressure chamber module 1 through the oil pipe 5 and the cooling module 4 or directly extracts the hydraulic oil from the pressure chamber module 1, the temperature and pressure sensor 23 measures pressure data of the pressure chamber module 1, the temperature and pressure sensor 23 feeds the pressure data back to the electronic control display module 3, and the electronic control display module 3 can further adjust the pressure of the pressure chamber module 1; when the temperature needs to be raised, the electronic control display module 3 transmits an instruction to the heating rod 22, the heating rod 22 heats hydraulic oil in the pressure chamber module 1, the vacuum heat insulation layer 10 prevents heat from dissipating, the temperature and pressure sensor 23 detects temperature data of the pressure chamber module 1 and transmits the temperature data to the electronic control display module 3, the electronic control display module 3 adjusts heating power according to the temperature data, if the temperature needs to be lowered, the electronic control display module 3 transmits an instruction to the servo pressure adjusting module 2, low-temperature oil of the cooling module 4 is injected into the pressure chamber module 1 through the oil line interface 13 under the action of the servo pressure adjusting module 2, and high-temperature oil in the pressure chamber module 1 is also transmitted back to the cooling module 4 through the oil line interface 13 to be cooled; the acoustic emission testing equipment 21 collects acoustic emission signals of the core 16, the strain sensor 17 and the strain gauge 18 collect deformation data of the core 16, and the data are transmitted to the electronic control display module 3 through a circuit.
The servo pressure adjusting module 2 comprises a shell, an electromagnetic valve, an oil cavity and a hydraulic sensor. An oil cavity is arranged in the shell and used for storing hydraulic oil, the oil cavity is connected with the pressure chamber module 1 and the cooling module 4 through an oil pipe 5, a hydraulic sensor is arranged in the oil cavity and connected with the electronic control display module 3 through a high-temperature and high-pressure resistant electric wire and used for monitoring the pressure in the oil cavity, electromagnetic valves are arranged on two sides of the shell and communicated with the oil cavity and the oil pipe 5, the electromagnetic valves are further connected with the electronic control display module 3 through high-temperature and high-pressure resistant electric wires, the electronic control display module 3 controls the electromagnetic valves to open and close to adjust the flow of the hydraulic oil among the servo pressure adjusting module 2, the cooling module 4 and the pressure chamber module 1, under the control of the electronic control display module 3, the electromagnetic valves can convey more hydraulic oil to the pressure chamber module 1 to provide a high-pressure environment, the hydraulic oil can be pumped back to the oil cavity to reduce the pressure of the pressure chamber module 1, when the pressure in the pressure chamber module 1 reaches the required target pressure in the electronic control display system module 3, and the hydraulic sensor of the servo pressure adjusting module 2 is monitored, the oil cavity is stable, the electromagnetic valves are controlled to be closed, and the internal pressure is completed. In addition, the electromagnetic valve extracts the high-temperature hydraulic oil in the pressure chamber module 1 and conveys the high-temperature hydraulic oil to the cooling module 4, and conveys the low-temperature hydraulic oil in the cooling module 4 to the pressure chamber module 1, so that the temperature of the pressure chamber module 1 can be regulated. The servo pressure adjusting module 2 controls the flow of hydraulic oil among the servo pressure adjusting module 2, the cooling module 4 and the pressure chamber module 1 by arranging an electromagnetic valve to regulate and control the temperature and the pressure in the pressure chamber module 1, and can provide various stable high-temperature and high-pressure environments for the pressure chamber module to realize the accurate calibration of the strain probe.
The electronic control display module 3 comprises a data acquisition unit, a computer and a control unit which are in communication connection with each other, wherein the data acquisition unit receives temperature and pressure data from a temperature and pressure sensor 23 and a hydraulic sensor, core 16 deformation data of a strain sensor 17 and acoustic emission data of an acoustic emission testing device 21 and transmits the data to the computer, the computer is used for setting parameters by a user, displaying the data acquired by each sensor, the running state of each working component, real-time scale and data record of a strain probe, generating an instruction according to a data processing result and parameters set by an operator, and the control unit receives the instruction and controls the operation of a heating rod, an electromagnetic valve, a cooling module 4 and the like to realize the regulation of the temperature and the pressure in the pressure chamber module 1. When the temperature and pressure calibration device starts to operate, the control unit sends an instruction to the heating rod, the electromagnetic valve and the like to adjust the temperature and the pressure of the pressure chamber module 1 according to user set parameters and an instrument initial state, the data acquisition unit receives temperature, pressure data and core data of the instrument and transmits the data to the computer, the computer records the core data at the moment, the control unit continues to generate an instruction to gradually increase the temperature and the pressure, a calibration curve and a temperature drift curve of the strain probe in the temperature and pressure change process are obtained, and calibration of the strain probe is achieved.
The cooling module 4 comprises a cooling module upper end cover 24, a cooling module lower end cover 25, a cooling module shell 26, a cooling module oil cavity 27, a water cooling unit 28, a circuit interface 12, an oil way interface 13, a high-strength bolt 14 and a temperature and pressure sensor 23. The cooling module upper end cover 24 and the cooling module lower end cover 25 are fixed on a cooling module shell 26 through high-strength bolts 14, a cooling module oil cavity 27 is arranged in the cooling module 4, oil circuit interfaces 13 are arranged on two sides of the cooling module oil cavity 27 and connected with the oil pipe 5, a water cooling unit 28 is arranged in the cooling module oil cavity 27, two ends of the water cooling unit 28 are respectively fixed on the cooling module upper end cover 24 and the cooling module lower end cover 25, the cooling module oil cavity 27 is further provided with a temperature and pressure sensor 23, circuit interfaces 12 are arranged on two sides of the cooling module 4, and the temperature and pressure sensor 23 is connected with a data acquisition unit through electric wires 6 penetrating through the circuit interfaces 12. When the temperature of the pressure chamber needs to be reduced, the electromagnetic valve of the servo pressure adjusting module 2 is opened, the low-temperature oil in the cooling module 4 is injected into the pressure chamber module, the high-temperature oil in the pressure chamber module 1 is conveyed back into the cooling module oil cavity 27, and the water cooling unit 28 rapidly reduces the oil temperature through water circulation.
Preferably, the shape of the water cooling unit 28 is a combination of a plurality of "V" shapes to increase the contact area of the cooling water and the hydraulic oil, so that the hydraulic oil is rapidly cooled.
Based on the above embodiments, an embodiment of the present invention provides a method for calibrating a strain probe simulating a high-temperature and high-pressure environment, including:
s100, preparing a rock core sample, mounting a sensor on the rock core, and mounting the rock core on a pressure chamber module 1, a connecting line and an oil way of a calibration device;
preferably, the standard cylinder sample is made of rock with better hardness or polytetrafluoroethylene hard plastic, and the size of the standard cylinder sample is phi 50mm multiplied by 100mm.
Specifically, the installation sensor on the core includes: a strain probe is pasted at the center of one end of the core, strain rosettes (formed by combining a plurality of strain gauges and used for measuring a strain field) are pasted at symmetrical positions of the other end of the core, and the direction of the strain rosettes in the strain probe is completely consistent with the direction of the strain rosettes on the other side; and after the sticking is finished, sleeving the rock core into a special rubber sleeve, and fixing acoustic emission testing equipment at the outer side.
The core installation includes: the core is placed in the center of the pressure chamber module 1, the circuits of the strain sensor, the temperature and pressure sensor, the acoustic emission testing equipment and the like are communicated with the circuit interfaces of the upper end cover and the lower end cover of the pressure chamber, the upper end cover and the lower end cover of the pressure chamber are closed, and the oil pipe 5 is connected.
S200, starting the electric control display module and the servo pressure adjusting module, and starting to inject hydraulic oil into the pressure chamber module 1;
s300, setting temperature and pressure, starting each sensor, starting loading according to a preset loading sequence, and automatically calibrating and calculating by a computer according to critical information such as strain, acoustic emission data, temperature and pressure and the like recorded by the sensors;
specifically, the setting the temperature and the pressure includes: the temperature is room temperature, and the pressure setting loading sequence is gradually increased.
Preferably, the order of pressure loading is 1MPa,2MPa, \ 8230;, 10MPa,20MPa, \ 8230;, 50MPa.
S400, repeating S300, gradually increasing the temperature, and recording analysis data to obtain a calibration curve and a temperature drift curve of the strain probe.
Specifically, the temperature ranges are room temperature +10 ℃, +20 ℃, + 8230, +80 ℃.
According to the strain probe calibration method, the strain data of the strain probe in the preset pressure increasing process at room temperature are measured, the temperature is gradually increased, the strain data of the strain probe in the preset pressure increasing process of the strain probe are measured, the temperature drift curve of the strain probe is obtained, and the calibration of the strain test results of the strain probe at different temperatures is realized.
It will be understood by those skilled in the art that the foregoing is only an exemplary embodiment of the present invention, and is not intended to limit the invention to the particular forms disclosed, since various modifications, substitutions and improvements within the spirit and scope of the invention are possible and within the scope of the appended claims.
Claims (9)
1. A strain probe calibration system for simulating a high-temperature and high-pressure environment is characterized by comprising: the device comprises a pressure chamber module (1) for simulating a high-temperature and high-pressure environment, acquiring a temperature pressure signal, a core deformation signal and a core acoustic emission signal, a servo pressure adjusting module (2) for adjusting the temperature and the pressure of the pressure chamber module (1) and providing various stable high-temperature and high-pressure environments, an electronic control display module (3) for receiving, processing and displaying temperature, pressure, core deformation and acoustic emission data, sending a control instruction and completing the calibration of a strain probe, a cooling module (4) for executing the temperature adjusting instruction, and a transmission module for transmitting data and serving as a hydraulic oil transmission channel;
the transmission module includes: an oil pipe (5) and an electric wire (6);
the pressure chamber module (1), the servo pressure adjusting module (2) and the cooling module (4) are mutually in oil circuit connection through the oil pipe (5);
the electronic control display module (3) is respectively in circuit connection with the pressure chamber module (1), the servo pressure adjusting module (2) and the cooling module (4) through the electric wire (6); the pressure chamber module (1) comprises: the device comprises a cavity, a heating rod (22) arranged in the cavity, a rock core (16) arranged in the cavity, a strain probe adhered to one end of the rock core (16), a strain gauge (18) adhered to the other end of the rock core (16), and high-temperature and high-voltage resistant electric wires (20) which are respectively in circuit connection with the heating rod (22), the strain probe and the strain gauge (18) and the electronic control display module (3); the core is sleeved in the rubber sleeve, and an acoustic emission measuring device (21) is fixed on the outer side of the core.
2. The strain probe calibration system as claimed in claim 1, wherein the servo pressure adjustment module (2) comprises: the oil cavity, locate hydraulic sensor in the oil cavity, connect hydraulic sensor with high temperature and high pressure resistant electric wire (20) of automatically controlled display module (3) and with the solenoid valve of oil cavity intercommunication, the solenoid valve with oil pipe (5) intercommunication.
3. The strain probe calibration system as claimed in claim 2, wherein the cooling module (4) comprises: the cooling device comprises a cooling module shell (26), a cooling module upper end cover (24) and a cooling module lower end cover (25) which are fixed on the cooling module shell (26), a water cooling unit (28) of which two ends are respectively fixed on the cooling module upper end cover (24) and the cooling module lower end cover (25), a cooling module oil cavity (27) arranged in the cooling module (4), oil circuit interfaces (13) arranged on two sides of the cooling module oil cavity (27) and connected with the oil pipe (5), a temperature and pressure sensor (23) arranged in the cooling module oil cavity (27), and circuit interfaces (12) arranged on two sides of the cooling module (4);
the temperature and pressure sensor (23) is connected with the electronic control display module (3) through an electric wire (6).
4. The strain probe calibration system according to claim 3, wherein the water cooling unit (28) is shaped as a combination of a plurality of "V" shapes.
5. Strain probe calibration system according to claim 4, wherein said electronically controlled display module (3) comprises: the system comprises a data acquisition unit for receiving data acquired by sensors and measuring equipment, a computer for setting user parameters and displaying the data acquired by the sensors, the running state of each working component, real-time calibration and data recording of a strain probe, and a control unit for generating instructions according to data processing results and parameters set by an operator;
the data acquisition unit, the computer and the control unit are in communication connection with each other.
6. The strain probe calibration system according to claim 5, wherein the data acquisition unit is in communication connection with the temperature and pressure sensor (23), the hydraulic sensor, the strain probe and the acoustic emission testing device (21), respectively.
7. The strain probe calibration system according to claim 5, wherein the control unit is in communication connection with the heating rod (22) and the solenoid valve.
8. A method for calibrating a strain probe simulating a high-temperature and high-pressure environment, which is used for using the strain probe calibration system as claimed in any one of claims 1 to 7, and comprises the following steps:
s100, preparing a rock core sample, mounting a sensor on the rock core, and mounting the rock core on a pressure chamber module (1), a connecting line and an oil way of a calibration device;
s200, starting the electric control display module and the servo pressure adjusting module, and starting to inject hydraulic oil into the pressure chamber module (1);
s300, setting temperature and pressure, starting each sensor, starting loading according to a preset loading sequence, and automatically calibrating and calculating by a computer according to key information including strain, acoustic emission data, temperature and pressure recorded by the sensors;
the setting the temperature and pressure includes: the temperature is room temperature, and the pressure setting loading sequence is gradually increased;
s400, repeating the step S300, gradually increasing the temperature, and recording analysis data to obtain a calibration curve and a temperature drift curve of the strain probe;
the temperature range is room temperature plus 10 ℃ to plus 80 ℃.
9. The method for calibrating a strain probe according to claim 8, wherein the mounting a sensor on the core comprises: a strain probe is pasted at the center of one end of the core, strain rosettes are pasted at the symmetrical positions of the other end of the core, the strain rosettes are formed by combining a plurality of strain gauges and used for measuring a strain field, and the direction of the strain rosettes in the strain probe is completely consistent with the direction of the strain rosettes on the other side; after the sticking is finished, the rock core is sleeved into a special rubber sleeve, and an acoustic emission measuring device is fixed on the outer side;
the core installation includes: and (3) placing the core in the center of the pressure chamber module (1), communicating the circuits of the strain probe, the temperature and pressure sensor (23) and the acoustic emission measuring device (21) with the circuit interfaces of the upper end cover and the lower end cover of the pressure chamber, closing the upper end cover and the lower end cover of the pressure chamber, and connecting the upper end cover and the lower end cover of the pressure chamber into an oil pipe (5).
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