CN109752406B - Measuring device for specific heat capacity parameter of low-permeability compact rock - Google Patents
Measuring device for specific heat capacity parameter of low-permeability compact rock Download PDFInfo
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- CN109752406B CN109752406B CN201910066666.XA CN201910066666A CN109752406B CN 109752406 B CN109752406 B CN 109752406B CN 201910066666 A CN201910066666 A CN 201910066666A CN 109752406 B CN109752406 B CN 109752406B
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Abstract
The invention provides a device for measuring specific heat capacity parameters of low-permeability dense rocks, which comprises: the temperature sensor comprises a controller, a shell, a first cavity, a second cavity, a temperature sensor and a heat insulation valve, wherein the first cavity, the second cavity, the temperature sensor and the heat insulation valve are arranged in the shell; placing a rock sample to be tested in the first cavity; a heater is arranged in the first cavity; the controller is respectively connected with the heater and the heat insulation valve and controls the heat insulation valve to be opened and closed, and the temperature sensor is connected with the controller and is used for monitoring the initial temperature in the second cavity when the first cavity is heated to a preset temperature and acquiring the stable temperature in the second cavity after the heat insulation valve is opened; and the controller determines the specific heat capacity parameter of the rock sample to be measured according to the initial temperature, the stable temperature, the preset temperature and the fluid medium. According to the invention, the specific heat capacity parameter of the rock sample to be measured is obtained by monitoring the temperature change in the two cavities and combining the attribute parameters of the fluid medium, so that the measurement accuracy of the specific heat capacity parameter of the rock is improved.
Description
Technical Field
The invention relates to the technical field of measurement, in particular to a device for measuring specific heat capacity parameters of low-permeability compact rocks.
Background
Temperature well testing is an important means for inverting parameters of complex oil and gas reservoirs, and is widely applied to unconventional oil and gas reservoirs, geothermal resources and the like. Temperature testing is performed on the premise that the bottom hole temperature distribution of the production well is accurately determined. Accurate determination of the specific heat capacity properties of the rock is therefore the basis for temperature testing of production wells.
The existing measurement scheme for the specific heat capacity property of the low-permeability compact rock is mostly non-steady-state measurement; generally, a rock sample to be measured is cut into large blocks or manufactured into a cylinder with the diameter larger than 50mm, the measuring surface of the low-permeability compact rock sample is polished smoothly by manpower, and then an induction sheet is tightly attached to the measuring surface of the rock sample. The rock sample is heated through the induction sheet, then the induction sheet monitors the temperature change of the measuring surface of the rock sample, and then the related parameters of the specific heat capacity of the low-permeability compact rock sample are obtained through calculation.
In the scheme, the smoothness of the measuring surface of the rock sample directly influences the clinging degree of the induction sheet and the rock sample, so that the heat transfer process from the induction sheet to the measuring surface is influenced, and the measuring error is caused; in addition, since anisotropy is common to all hypotonic dense rocks, the above scheme actually measures a specific heat capacity parameter on the measured surface of the rock sample. Therefore, in the existing measurement scheme, uncertain factors such as the form of the rock sample and the smoothness of the measured surface influence the final measurement result, and further increase the error of the measurement result.
Disclosure of Invention
In order to solve the problems of inaccurate measurement, large error and the like existing in the measurement of the specific heat capacity parameter of the existing low-permeability compact rock, the invention provides a measurement device of the specific heat capacity parameter of the low-permeability compact rock, which comprises the following components: the temperature sensor comprises a controller, a shell, a first cavity, a second cavity, a temperature sensor and a heat insulation valve, wherein the first cavity, the second cavity and the temperature sensor are arranged in the shell; wherein the first cavity and the second cavity are filled with the same fluid medium;
placing a rock sample to be tested in the fluid medium in the first cavity; a heater is arranged in the first cavity and used for heating the fluid medium in the first cavity to a preset temperature;
the controller is respectively connected with the heater and the heat insulation valve and is used for controlling the heat insulation valve to be closed before the heater starts to heat and controlling the heat insulation valve to be opened after the fluid medium in the first cavity is heated to the preset temperature;
the temperature sensor is connected with the controller and used for collecting the initial temperature of the fluid medium in the second cavity when the fluid medium in the first cavity is heated to the preset temperature, collecting the stable temperature of the fluid medium in the second cavity after the heat insulation valve is opened, and sending the initial temperature and the stable temperature to the controller;
and the controller determines the specific heat capacity parameter of the rock sample to be tested according to the initial temperature, the stable temperature, the preset temperature and the fluid medium.
Optionally, in an embodiment of the present invention, the controller includes: the first calculating unit is used for calculating a first heat variation of the fluid medium in the first cavity after the heat insulation valve is opened according to the preset temperature and the stable temperature; the second calculation unit is used for calculating a second heat variation of the fluid medium in the second cavity after the heat insulation valve is opened according to the initial temperature and the stable temperature; the determining unit is used for receiving the first heat variation sent by the first calculating unit and the second heat variation sent by the second calculating unit, and determining the specific heat capacity parameter of the rock sample to be tested according to the first heat variation, the second heat variation and the specific heat parameter of the fluid medium.
Optionally, in an embodiment of the present invention, the controller includes: the pre-control unit is connected with the heat insulation valve and is used for opening the heat insulation valve before the heater starts to heat so that the fluid medium in the first cavity and the fluid medium in the second cavity have the same temperature.
Optionally, in an embodiment of the present invention, a heat insulation layer is disposed in the casing, and the heat insulation layer respectively surrounds the first cavity and the second cavity, and is used for isolating a temperature between the first cavity and the second cavity, and isolating a temperature outside the casing from the first cavity, the second cavity, and the casing.
Optionally, in an embodiment of the present invention, the thermal insulation layer is made of a urethane foam material.
Optionally, in an embodiment of the present invention, the fluid medium is a gas.
Optionally, in an embodiment of the present invention, the shape of the rock sample to be tested is a sheet shape.
Optionally, in an embodiment of the present invention, the first cavity and the second cavity are both sealed heat insulation cavities.
Optionally, in an embodiment of the present invention, the method further includes: a fluid containment bottle; the fluid containing bottle is connected to the second cavity and is used for filling the fluid medium into the second cavity.
Optionally, in an embodiment of the present invention, a chamber door is disposed on the first chamber.
According to the device for measuring the specific heat capacity parameter of the low-permeability compact rock, the first cavity, the second cavity and the temperature sensor which are sealed and insulated are arranged in the shell, and the first cavity and the second cavity are filled with the same fluid medium; and then heating the rock sample to be tested in the fluid medium in the first cavity through a heater arranged in the first cavity. A heat insulation valve is arranged between the first cavity and the second cavity, and the controller is respectively connected with the heater and the heat insulation valve; the controller is used for controlling to close the heat insulation valve before the heater starts to heat, and controlling to open the heat insulation valve after the fluid medium in the first cavity is heated to the preset temperature; the temperature-sensing ware is connected the controller the inside fluid medium of first cavity heats to back during the preset temperature, gather the initial temperature of the inside fluid medium of second cavity, and after the thermal-insulated valve was opened, gather the steady temperature of the inside fluid medium of second cavity, the controller basis initial temperature the steady temperature the preset temperature and fluid medium confirms the specific heat capacity parameter of the rock specimen that awaits measuring. So, through monitoring the temperature variation of the fluid medium in two cavitys, combine the attribute parameter of fluid medium, can indirect calculation obtain the specific heat capacity parameter of the rock specimen that awaits measuring, compare with the current mode that directly adopts the response piece to measure, need not select and handle the measurement surface, avoided the measurement error that the unstable tape of measurement surface has, improved the precision of hypotonic dense rock specific heat capacity parameter measurement.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive labor.
FIG. 1 is a structural diagram of a measuring device for specific heat capacity parameters of low-permeability dense rocks according to an exemplary embodiment of the invention;
FIG. 2 is a structural diagram of a measuring device for specific heat capacity parameters of low-permeability dense rocks according to another exemplary embodiment of the invention;
reference numerals:
1-rubber foot stool, 2-metal box, 3-urethane foam material, 4-heat insulation valve, 5-rock sample cavity, 6-rock sample to be tested, 7-heat-resistant thin wire, 8-heating resistance wire, 9-cavity door, 10-data line, 11-device door, 12-hinge, 13-computer, 14-temperature sensor, 15-gas cavity, 16-first pipeline, 17-air inlet valve, 18-air outlet valve, 19-second pipeline and 20-fluid containing bottle.
Detailed Description
The embodiment of the invention provides a device for measuring specific heat capacity parameters of low-permeability dense rocks.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
FIG. 1 is a block diagram of a device for measuring a rock specific heat capacity parameter according to an exemplary embodiment of the present invention. The apparatus shown in the figures comprises: the temperature control device comprises a controller 200, a shell 100, a first cavity 110, a second cavity 120, a temperature sensor 130 and a heat insulation valve 140, wherein the first cavity 110, the second cavity 120, the temperature sensor 130 and the heat insulation valve 140 are arranged in the shell; wherein the first cavity and the second cavity are filled with the same fluid medium;
placing a rock sample to be tested in the fluid medium in the first cavity; a heater is arranged in the first cavity and used for heating the fluid medium in the first cavity to a preset temperature;
the controller is respectively connected with the heater and the heat insulation valve and is used for controlling the heat insulation valve to be closed before the heater starts to heat and controlling the heat insulation valve to be opened after the fluid medium in the first cavity is heated to the preset temperature;
the temperature sensor is connected with the controller and used for collecting the initial temperature of the fluid medium in the second cavity when the fluid medium in the first cavity is heated to the preset temperature, collecting the stable temperature of the fluid medium in the second cavity after the heat insulation valve is opened, and sending the initial temperature and the stable temperature to the controller;
and the controller determines the specific heat capacity parameter of the rock sample to be tested according to the initial temperature, the stable temperature, the preset temperature and the fluid medium.
As an embodiment of the present invention, the controller includes: the first calculating unit is used for calculating a first heat variation of the fluid medium in the first cavity after the heat insulation valve is opened according to the preset temperature and the stable temperature; the second calculation unit is used for calculating a second heat variation of the fluid medium in the second cavity after the heat insulation valve is opened according to the initial temperature and the stable temperature; the determining unit is used for receiving the first heat variation sent by the first calculating unit and the second heat variation sent by the second calculating unit, and determining the specific heat capacity parameter of the rock sample to be tested according to the first heat variation, the second heat variation and the specific heat parameter of the fluid medium.
As an embodiment of the present invention, the controller includes: the pre-control unit is connected with the heat insulation valve and is used for opening the heat insulation valve before the heater starts to heat so that the fluid medium in the first cavity and the fluid medium in the second cavity have the same temperature.
As an embodiment of the present invention, a heat insulation layer is disposed in the housing, and the heat insulation layer respectively surrounds the first cavity and the second cavity, and is used for isolating a temperature between the first cavity and the second cavity and isolating a temperature outside the first cavity, the second cavity, and the housing.
In this embodiment, the thermal insulation layer is made of a urethane foam material.
In an embodiment of the present invention, the fluid medium is a gas.
As an embodiment of the present invention, the rock sample to be tested is in a sheet shape.
As an embodiment of the present invention, the first cavity and the second cavity are both sealed heat insulation cavities.
As an embodiment of the present invention, the method further includes: a fluid containment bottle; the fluid containing bottle is connected to the second cavity and is used for filling the fluid medium into the second cavity.
As an embodiment of the present invention, a chamber door is disposed on the first chamber.
In a specific embodiment of the present invention, as shown in fig. 1, the present embodiment provides a device for measuring a specific heat capacity parameter of a rock, the device comprising: the controller 200 and the housing 100, and the first cavity 110, the second cavity 120 and the temperature sensor 130 disposed in the housing 100; the first cavity 110 and the second cavity 120 are both sealed heat-insulating cavities; the first cavity 110 and the second cavity 120 are filled with the same fluid medium; wherein, the rock sample to be tested is placed in the fluid medium inside the first cavity 110; a heater 111 is arranged in the first cavity 110 and used for heating the fluid medium in the first cavity 110 to a preset temperature; a heat insulation valve 140 is arranged between the first cavity 110 and the second cavity 120, and the controller 200 is respectively connected with the heater 111 and the heat insulation valve 140; the controller 200 is used for controlling to close the heat insulation valve 140 before the heater 111 starts heating; the controller 200 is further configured to control to open the heat insulation valve 140 after the fluid medium inside the first cavity 110 is heated to a preset temperature; the temperature sensor 130 is connected to the controller 200, and is configured to collect an initial temperature of the fluid medium inside the second cavity 120 when the fluid medium inside the first cavity 110 is heated to a preset temperature, collect a stable temperature of the fluid medium inside the second cavity 120 after the heat insulation valve 140 is opened, and send the initial temperature and the stable temperature to the controller 200; the controller 200 is further configured to receive the initial temperature and the stable temperature sent by the temperature sensor 130, and determine a specific heat capacity parameter of the rock sample to be measured according to the initial temperature, the stable temperature, a preset temperature and the fluid medium.
The device for measuring the specific heat capacity parameter of the rock provided by the embodiment is characterized in that a first cavity 110, a second cavity 120 and a temperature sensor 130 which are sealed and insulated are arranged in a shell 100, and the first cavity 110 and the second cavity 120 are filled with the same fluid medium; the rock sample to be tested placed in the fluid medium inside the first chamber 110 is then heated by a heater 111 disposed inside the first chamber 110. A heat insulation valve 140 is arranged between the first cavity 110 and the second cavity 120, and the controller 200 is respectively connected with the heater 111 and the heat insulation valve 140; the controller 200 is configured to control to close the thermal insulation valve 140 before the heater 111 starts heating, and control to open the thermal insulation valve 140 after the fluid medium inside the first cavity 110 is heated to a preset temperature; the temperature sensor 130 is connected to the controller 200, after the fluid medium inside the first cavity 110 is heated to a preset temperature and before the thermal insulation valve 140 is opened, the temperature sensor 130 collects an initial temperature of the fluid medium inside the second cavity 120, and after the thermal insulation valve 140 is opened, collects a stable temperature of the fluid medium inside the second cavity 120, and the controller 200 determines a specific heat capacity parameter of the rock sample to be measured according to the initial temperature, the stable temperature, the preset temperature and the fluid medium. So, through monitoring the temperature variation of the fluid medium in two cavitys, combine fluid medium's attribute parameter, can indirect calculation obtain the specific heat capacity parameter of the rock specimen that awaits measuring, compare with the current mode that directly adopts the response piece to measure, need not select and handle the measurement surface, avoided the unstable measuring error who has taken of measurement surface, improved the precision of rock specific heat capacity parameter measurement. Moreover, the device has no requirements on the shape and size of the rock sample to be measured, the applicability is strong, the operation is simple, and the convenience of the specific heat capacity measurement process of the rock is improved.
FIG. 2 is a structural diagram of a device for measuring the specific heat capacity parameter of the rock according to another exemplary embodiment of the invention.
As shown in fig. 2, the present embodiment provides a device for measuring a rock specific heat capacity parameter, which is based on the device for measuring a rock specific heat capacity parameter shown in an exemplary embodiment of the present invention, and further includes specific components of a controller, a thermal insulation layer, a fluid containing bottle 20, a chamber door 9, and the like. The device specifically includes:
the temperature sensor comprises a controller, a shell, a first cavity, a second cavity and a temperature sensor, wherein the first cavity, the second cavity and the temperature sensor are arranged in the shell; . The first cavity and the second cavity are both sealed heat-insulating cavities; the first cavity and the second cavity are filled with the same fluid medium; wherein, the rock sample 6 to be tested is placed in the fluid medium in the first cavity; a heater is arranged in the first cavity and used for heating the fluid medium in the first cavity to a preset temperature; a heat insulation valve 4 is arranged between the first cavity and the second cavity, and the controller is respectively connected with the heater and the heat insulation valve 4; the controller is used for controlling the heat insulation valve 4 to be closed before the heater starts heating; the controller is also used for controlling the heat insulation valve 4 to be opened after the fluid medium in the first cavity is heated to a preset temperature; the temperature sensor is connected with the controller and used for collecting the initial temperature of the fluid medium in the second cavity when the fluid medium in the first cavity is heated to a preset temperature, collecting the stable temperature of the fluid medium in the second cavity after the heat insulation valve 4 is opened, and sending the initial temperature and the stable temperature to the controller; the controller is also used for receiving the initial temperature and the stable temperature sent by the temperature sensor, and determining the specific heat capacity parameter of the rock sample 6 to be measured according to the initial temperature, the stable temperature, the preset temperature and the fluid medium.
In the embodiment, a first cavity, a second cavity and a temperature sensor which are sealed and insulated are arranged in a shell, and the first cavity and the second cavity are filled with the same fluid medium; the rock sample 6 to be tested placed in the fluid medium inside the first cavity is then heated by a heater arranged inside the first cavity. A heat insulation valve 4 is arranged between the first cavity and the second cavity, and the controller is respectively connected with the heater and the heat insulation valve 4; the controller is used for controlling the heat insulation valve 4 to be closed before the heater starts to heat, and controlling the heat insulation valve 4 to be opened after the fluid medium in the first cavity is heated to a preset temperature; the temperature sensor is connected with the controller, after the fluid medium in the first cavity is heated to the preset temperature, the temperature sensor collects the initial temperature of the fluid medium in the second cavity, and after the heat insulation valve 4 is opened, the stable temperature of the fluid medium in the second cavity is collected, and the controller determines the specific heat capacity parameter of the rock sample 6 to be measured according to the initial temperature, the stable temperature, the preset temperature and the fluid medium. So, through monitoring the temperature variation of the fluid medium in two cavitys, combine the attribute parameter of fluid medium, can indirect calculation obtain the specific heat capacity parameter of the rock specimen 6 that awaits measuring, compare with the current mode that directly adopts the response piece to measure, need not select and handle the measurement surface, avoided the measurement error that the measurement surface unstability has taken, improved the precision of rock specific heat capacity parameter measurement. Moreover, the device has no requirements on the shape and the size of the rock sample 6 to be measured, the applicability is strong, the operation is simple, and the convenience of the specific heat capacity measurement process of the rock is improved.
Specifically, as shown in fig. 2, the metal case 2 may be made of metal, such as the thick metal case 2 in fig. 2, and a rubber foot 11 may be provided at the bottom of the metal case 2 for supporting and fixing the whole apparatus. Optionally, a heat insulation layer is arranged in the metal box 2, and the heat insulation layer surrounds the first cavity and the second cavity respectively and is used for isolating the temperature between the first cavity and the second cavity and isolating the temperature outside the first cavity, the second cavity and the metal box 2. The heat insulating layer can be made of a polyurethane foam material 3, the polyurethane foam material 3 is good in heat insulating property, material taking cost is low, and specific heat capacity parameter measurement of a large number of rock samples 6 to be measured is facilitated. Therefore, the polyurethane foam material can be filled between the interlayers in the metal box 2, so that the heat insulation effect with the outside is achieved, and the heat insulation between the first cavity and the second cavity is realized.
Optionally, the fluid medium may be a gas, such as carbon dioxide gas, which has good gas fluidity, convenient material selection, stable energy exchange property, and can provide relatively accurate temperature variation parameters. Taking the fluid medium as gas as an example, the first cavity on the left side in the device is a rock sample cavity 5, and the second cavity on the right side is a gas cavity 15. The heat insulation valve 4 is connected with the two cavities, and when the heat insulation valve 4 is closed, gas in the two cavities can be isolated, and heat transfer of the two cavities is prevented by the heat insulation effect. The temperature sensor 14 may include two temperature measuring probes, respectively disposed inside the two cavities. The temperature sensor 14 can measure the temperature inside the two cavities in real time, and the measured data can be transmitted to the controller for data processing through the data line 10, and the controller can be a computer, and the measured data can be displayed through a computer screen.
Optionally, the rock sample 6 to be tested is sheet-like in shape. For example, the rock sample 6 to be measured is processed into a thick sheet shape, which is beneficial to heat exchange between the rock sample 6 to be measured and the surrounding fluid medium.
Optionally, the heater is a heating resistance wire 8. As shown in figure 2, a heating resistance wire 8 is arranged in the rock sample cavity 5, and a rock sample 6 to be measured is suspended in the rock sample cavity 5 by a heat-resistant thin wire 7.
Optionally, a chamber door 9 is provided on the first chamber. As shown in figure 2, the upper part of the rock sample cavity 5 is provided with a cavity door 9 which is convenient for opening the cavity to put the rock sample 6 and can also be used for fixing the upper end of the heat-resisting thin wire 7.
Optionally, the apparatus may further include: and the device door 11 is arranged on the upper side of the rock sample cavity 5. As shown in fig. 2, the device door 11 is at the upper left of the device, and the hinge 12 is used to fix the device door 11 while facilitating the opening of the door.
Optionally, the method further comprises: a fluid-containing bottle 20; a fluid-containing bottle 20 is connected to the second chamber for filling the interior of the second chamber with a fluid medium. Specifically, as shown in fig. 2, the second chamber may allow the gas chamber 15, at the upper right side of the gas chamber 15, to communicate with the outside through a first pipe 19, and a release valve 18 is installed while passing through the thermal insulation layer, and the exchange of the material and energy with the outside in the gas chamber 15 may be isolated when the release valve 18 is closed. Meanwhile, the gas chamber 15 is also connected to the fluid container bottle 20 by a second line 16, and an air inlet valve 17 may be installed on the second line 16 for controlling the opening and closing of the fluid container bottle 20 for filling the fluid medium into the gas chamber 15.
Optionally, the controller further comprises: and the pre-control unit is connected with the heat insulation valve 4 and is used for opening the heat insulation valve 4 before the heating resistance wire 8 starts to heat so that the fluid medium in the first cavity and the fluid medium in the second cavity have the same temperature.
In this embodiment, in order to ensure the accuracy of the temperature conversion and measurement process, the same temperature may be maintained in the gas chamber 15 (second chamber) and the rock sample chamber 5 (first chamber) before the heating of the heating resistance wire 8 is started. In practical application, as shown in fig. 2, the rock sample 6 to be tested is firstly fixed on the chamber door 9 by the heat-resistant thin wire 7, so that the rock sample 6 to be tested is suspended in the rock sample chamber 5. Assuming that carbon dioxide gas is contained in the fluid-containing bottle 20, before the heating resistance wire 8 starts to heat, the air release valve 18 is opened, the heat insulation valve 4 is opened, and then the inside of the gas chamber 15 and the inside of the rock sample chamber 5 are filled with the same air. And then the air inlet valve 17 is opened, so that the carbon dioxide gas displaces the air in the gas cavity 15 and the rock sample cavity 5, and after the air displacement is finished, the gas cavity 15 and the rock sample cavity 5 are filled with the carbon dioxide gas at the same temperature. The deflation valve 18 and the air inlet valve 17 are then closed again and the insulation valve 4 is closed before the heating of the heating resistance wire 8 is started.
Optionally, the controller comprises: the first calculating unit is used for calculating a first heat variation of the fluid medium in the first cavity after the heat insulation valve 4 is opened according to the preset temperature and the stable temperature; the second calculation unit is used for calculating a second heat variation of the fluid medium in the second cavity after the heat insulation valve 4 is opened according to the initial temperature and the stable temperature; and the determining unit is respectively connected with the first calculating unit and the second calculating unit and is used for receiving the first heat variation sent by the first calculating unit and the second heat variation sent by the second calculating unit and determining the specific heat capacity parameter of the rock sample 6 to be measured according to the first heat variation, the second heat variation and the specific heat parameter of the fluid medium.
In this embodiment, the controller may be used for data processing and device control. The controller includes at least: the device comprises a first calculating unit, a second calculating unit and a determining unit, wherein the first calculating unit calculates a first heat variation of a fluid medium in a first cavity after an insulation valve 4 is opened; the second calculating unit is used for calculating a second heat variation of the fluid medium in the second cavity after the heat insulation valve 4 is opened; and the determining unit is respectively connected with the first calculating unit and the second calculating unit and determines the specific heat capacity parameter of the rock sample 6 to be detected according to the first heat variation, the second heat variation and the specific heat parameter of the fluid medium.
In practical applications, as shown in fig. 2, the controller may be implemented by using a computer 13, such as a notebook computer. The gas cavity 15 and the rock sample cavity 5 are filled with carbon dioxide gas, the temperature is the same, after the air release valve 18 and the air inlet valve 17 are closed and the heat insulation valve 4 is closed, the heating resistance wire 8 is opened through the computer 13, and the rock sample cavity 5 is heated to the preset temperature through the heating resistance wire 8. And after the temperature in the rock sample cavity 5 is stable, the heating resistance wire 8 is closed. Then, the temperature sensor 14 measures the temperature of the fluid medium inside the second chamber at this time as an initial temperature, and transmits the initial temperature to the computer 13. Then, the computer 13 controls the heat insulation valve 4 to be opened, so that the gas cavity 15 and the rock sample cavity 5 perform heat flow transfer, after the temperatures in the two cavities are stable, the temperature sensor 14 measures the final stable temperature as the stable temperature, and sends the stable temperature to the computer 13. The computer 13 calculates the specific heat capacity parameter of the rock sample 6 to be measured by adopting the following method:
firstly, specific heat capacity parameters Cg of carbon dioxide gas, the volume Vg1 of the carbon dioxide gas in the rock sample cavity 5, the volume V2 of the rock sample 6 to be detected and the volume Vg2 of the carbon dioxide gas in the gas cavity 15 are obtained. The data may be obtained locally or in a server through a network, which is not limited in this embodiment.
Then, the first calculation unit calculates the first amount of change in heat quantity using the following formula
The formula I is as follows: q1＝Cg×Vg1×(T1-T3)
The second calculating unit calculates a second heat quantity variation amount using the following formula
The formula II is as follows: q2＝Cg×Vg2×(T3-T2)
The heat quantity variation of the rock sample 6 to be measured is
The formula III is as follows: q3＝C0×V2×(T1-T3)
And according to the actual scene, the formula four is satisfied: q2＝Q1+Q3，
Wherein, C0Representing the specific heat capacity parameter, Q, of the rock sample 6 to be tested1Representing a first amount of change, Q2Representing a second amount of heat change, Q3Representing the amount of heat change, T, of the rock sample 6 to be tested1Indicating a preset temperature, T2Denotes the initial temperature, T3Indicating the stabilization temperature. The specific heat capacity parameter C of the rock sample 6 to be measured can be obtained by combining the formula I to the formula IV0。
According to the device for measuring the specific heat capacity parameter of the low-permeability compact rock, the sealed and heat-insulated gas cavity 15, the rock sample cavity 5 and the temperature sensor are arranged in the metal box 2, and the same gas medium is filled in the gas cavity 15 and the rock sample cavity 5; then the rock sample 6 to be measured placed in the gas medium in the rock sample cavity 5 is heated through the heating resistance wire 8 arranged in the rock sample cavity 5. A heat insulation valve 4 is arranged between the rock sample cavity 5 and the gas cavity 15, and the computer 13 is respectively connected with the heating resistance wire 8 and the heat insulation valve 4; the computer 13 is used for controlling the heat insulation valve 4 to be closed before the heating resistance wire 8 starts to heat, and controlling the heat insulation valve 4 to be opened when the gas medium in the rock sample cavity 5 is heated to a preset temperature; the temperature sensor is connected with the computer 13, after the gas medium in the rock sample cavity 5 is heated to the preset temperature, the initial temperature of the gas medium in the gas cavity 15 is collected, after the heat insulation valve 4 is opened, the stable temperature of the gas medium in the gas cavity 15 is collected, and the computer 13 determines the specific heat capacity parameter of the rock sample 6 to be measured according to the initial temperature, the stable temperature, the preset temperature and the gas medium. So, through monitoring the temperature variation of the inside gaseous medium of two cavitys, combine the attribute parameter of gaseous medium, can indirect calculation obtain the specific heat capacity parameter of the rock specimen 6 that awaits measuring, compare with the current mode that directly adopts the response piece to measure, need not select and handle the measurement surface, avoided the measurement error that the unstable tape of measurement surface has, improved the precision of hypotonic dense rock specific heat capacity parameter measurement. Moreover, the device has no requirements on the shape and size of the rock sample 6 to be measured, the applicability is strong, the operation is simple, and the convenience of the specific heat capacity measurement process of the low-permeability compact rock is improved.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A measuring device for specific heat capacity parameters of low-permeability dense rocks is characterized by comprising: the temperature sensor comprises a controller, a shell, a first cavity, a second cavity, a temperature sensor and a heat insulation valve, wherein the first cavity, the second cavity and the temperature sensor are arranged in the shell; wherein the first cavity and the second cavity are filled with the same fluid medium;
placing a rock sample to be tested in the fluid medium in the first cavity; a heater is arranged in the first cavity and used for heating the fluid medium in the first cavity to a preset temperature;
the controller is respectively connected with the heater and the heat insulation valve and is used for controlling the heat insulation valve to be closed before the heater starts to heat and controlling the heat insulation valve to be opened after the fluid medium in the first cavity is heated to the preset temperature;
the temperature sensor is connected with the controller and used for collecting the initial temperature of the fluid medium in the second cavity when the fluid medium in the first cavity is heated to the preset temperature, collecting the stable temperature of the fluid medium in the second cavity after the heat insulation valve is opened, and sending the initial temperature and the stable temperature to the controller;
and the controller determines the specific heat capacity parameter of the rock sample to be tested according to the initial temperature, the stable temperature, the preset temperature and the fluid medium.
2. The apparatus of claim 1, wherein the controller comprises:
the first calculating unit is used for calculating a first heat variation of the fluid medium in the first cavity after the heat insulation valve is opened according to the preset temperature and the stable temperature;
the second calculation unit is used for calculating a second heat variation of the fluid medium in the second cavity after the heat insulation valve is opened according to the initial temperature and the stable temperature;
the determining unit is used for receiving the first heat variation sent by the first calculating unit and the second heat variation sent by the second calculating unit, and determining the specific heat capacity parameter of the rock sample to be tested according to the first heat variation, the second heat variation and the specific heat parameter of the fluid medium.
3. The apparatus of claim 1, wherein the controller comprises:
the pre-control unit is connected with the heat insulation valve and is used for opening the heat insulation valve before the heater starts to heat so that the fluid medium in the first cavity and the fluid medium in the second cavity have the same temperature.
4. The device of claim 1, wherein a thermal insulation layer is disposed within the housing, the thermal insulation layer surrounding the first cavity and the second cavity, respectively, for insulating a temperature between the first cavity and the second cavity, and insulating a temperature outside the first cavity, the second cavity, and the housing.
5. The apparatus of claim 4, wherein the insulation layer is a urethane foam.
6. The device according to any one of claims 1 to 5, wherein the fluid medium is a gas.
7. The apparatus according to any one of claims 1 to 5, wherein the rock sample to be tested is sheet-like in shape.
8. The device of any one of claims 1 to 5, wherein the first cavity and the second cavity are both hermetically insulated cavities.
9. The apparatus of any one of claims 1 to 5, further comprising: a fluid containment bottle; the fluid containing bottle is connected to the second cavity and is used for filling the fluid medium into the second cavity.
10. The device of any one of claims 1 to 5, wherein a chamber door is provided on the first chamber.
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| CN102597513A (en) * | 2009-09-10 | 2012-07-18 | 阿隆·J·洪特 | Liquid metal thermal storage system |
| US9864847B2 (en) * | 2014-09-04 | 2018-01-09 | Robert A. Bellantone | Method for predicting the solubility of a molecule in a polymer at a given temperature |
| CN106573245B (en) * | 2014-06-30 | 2019-06-18 | 生物辐射实验室股份有限公司 | Realize the floating thermo-contact of PCR |
| CN104749214B (en) * | 2015-04-03 | 2017-06-06 | 哈尔滨工业大学 | A kind of constant temperature hot bath device that liquid thermal conductivity factor is measured based on Adsorbent By Using Transient Plane Source Technique |
| CN105699420B (en) * | 2016-03-01 | 2018-02-27 | 内蒙古科技大学 | A kind of heat-insulating specific heat of solid and heat measurement apparatus and method |
| CN105716948B (en) * | 2016-03-08 | 2017-05-17 | 中国科学院南海海洋研究所 | System and method for testing temperature response coefficient of heat insulation stress change of underground rock |
| CN105784756B (en) * | 2016-03-08 | 2017-10-27 | 中国科学院南海海洋研究所 | Rock fever property test system and method under condition of high voltage |
| CN106198616B (en) * | 2016-06-30 | 2019-07-02 | 上海第二工业大学 | Synchronism detection nano fluid heat transferring coefficient and its system and method to thermoelectric heat generation system generating efficiency affecting laws |
| RU2623824C1 (en) * | 2016-10-27 | 2017-06-29 | федеральное государственное бюджетное образовательное учреждение высшего образования "Национальный исследовательский университет "МЭИ" (ФГБОУ ВО "НИУ "МЭИ") | Installation for determination subsoil rocks temperature change rates |
| CN107014974B (en) * | 2016-11-28 | 2019-05-21 | 中国石油大学(华东) | Imitative experimental appliance for enhanced geothermal system and the method for testing enhanced geothermal system reservoir thermal energy recovery rate using it |
| CN106761511B (en) * | 2016-12-02 | 2019-03-22 | 中国石油大学(华东) | Flow through media with double-porosity channelling amount characterizing method and experimental provision |
| CN106769778B (en) * | 2017-01-20 | 2019-05-10 | 清华大学 | A kind of permeability measurement systems and measurement method of hypotonic rock particle |
| CN107064209B (en) * | 2017-03-21 | 2019-07-09 | 湘潭大学 | A kind of high-efficiency high-accuracy electronic equipment measurement experiment device |
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| CN206671237U (en) * | 2017-04-12 | 2017-11-24 | 贵州师范学院 | A kind of specific heat of solid and heat measurement apparatus |
| CN207600989U (en) * | 2017-10-30 | 2018-07-10 | 长安大学 | A kind of specific heat of solid and heat measuring device |
| CN207457113U (en) * | 2017-11-22 | 2018-06-05 | 河南莱帕克化工设备制造有限公司 | Heat transfer device |
| CN108760802A (en) * | 2018-05-21 | 2018-11-06 | 辽宁工程技术大学 | Temperature Evolution token test device and method during coal petrography adsorption-desorption gas |
| CN109211971B (en) * | 2018-11-16 | 2020-04-10 | 中国矿业大学 | Method for measuring convective heat transfer coefficient of water-rock interface in seepage heat transfer process of fracture sample |
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