CN111380903B - Method and device for determining specific heat capacity of shale - Google Patents
Method and device for determining specific heat capacity of shale Download PDFInfo
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- CN111380903B CN111380903B CN201811631847.4A CN201811631847A CN111380903B CN 111380903 B CN111380903 B CN 111380903B CN 201811631847 A CN201811631847 A CN 201811631847A CN 111380903 B CN111380903 B CN 111380903B
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- 238000000034 method Methods 0.000 title claims abstract description 44
- 239000000523 sample Substances 0.000 claims abstract description 264
- 239000011435 rock Substances 0.000 claims abstract description 98
- 239000012496 blank sample Substances 0.000 claims abstract description 64
- 238000010438 heat treatment Methods 0.000 claims abstract description 47
- 230000008859 change Effects 0.000 claims abstract description 44
- 238000004364 calculation method Methods 0.000 claims abstract description 17
- 238000012545 processing Methods 0.000 claims description 28
- 238000009849 vacuum degassing Methods 0.000 claims description 21
- 238000001035 drying Methods 0.000 claims description 20
- 238000004590 computer program Methods 0.000 claims description 13
- 238000003860 storage Methods 0.000 claims description 7
- 238000010586 diagram Methods 0.000 description 10
- 230000008569 process Effects 0.000 description 10
- 230000006870 function Effects 0.000 description 5
- 238000009826 distribution Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 229910052594 sapphire Inorganic materials 0.000 description 3
- 239000010980 sapphire Substances 0.000 description 3
- 239000003079 shale oil Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000005303 weighing Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009172 bursting Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000007669 thermal treatment Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
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Abstract
The invention provides a method and a device for determining specific heat capacity of shale, wherein the method comprises the following steps: heating the blank sample and the standard rock sample to obtain relation data of heat flow rate and temperature change of the blank sample and the standard rock sample; pressurizing the shale sample; heating the pressurized shale sample to obtain the heat flow rate and temperature change relation data of the pressurized shale sample; and obtaining the specific heat capacity of the shale according to the heat flow rate and temperature change relation data of the blank sample, the standard rock sample and the pressurized shale sample. The method can obtain the specific heat capacity of the shale at a high-temperature stage, and has high calculation accuracy.
Description
Technical Field
The invention relates to the field of petroleum exploration, in particular to a method and a device for determining specific heat capacity of shale.
Background
In recent years, shale oil and gas gradually become hot spots of exploration and research in the unconventional oil and gas field, the in-situ modification technology is an effective way for realizing shale oil exploitation, and effective evaluation of thermal field distribution in the in-situ heating modification process is a key for restricting shale oil exploitation well position deployment and economic accounting. The current thermal field distribution is mainly simulated by software such as ANASYS and Fluent, and the important parameter specific heat capacity in the thermal field distribution simulation process is data obtained by testing by adopting a differential thermal analyzer at normal temperature and normal pressure. The sample mass is reduced due to the fact that the shale generates and discharges hydrocarbons after the temperature of the shale exceeds 350 ℃, so that high-temperature specific heat data cannot be obtained, and normal-temperature and normal-pressure data neglects the influence of high temperature and high pressure on the thermal property of the shale and the influence of generated products, and seriously influences the precision of the constructed thermal field distribution.
At present, a comparison method is mainly adopted for determining specific heat capacity of shale, the method is based on the specific heat of a sapphire standard substance and a substance to be detected, and the specific heat of the substance to be detected is obtained through comparison, but how to obtain specific heat data of a shale sample under the condition that the quality of the shale sample is changed due to hydrocarbon generation and discharge of the shale after high temperature is not analyzed.
Disclosure of Invention
The embodiment of the invention provides a method for determining specific heat capacity of shale, which is used for obtaining specific heat capacity of the shale at a high-temperature stage and has high calculation precision, and the method comprises the following steps:
heating the blank sample and the standard rock sample to obtain the relation data of the heat flow rate and the temperature change of the blank sample and the standard rock sample;
pressurizing the shale sample;
heating the pressurized shale sample to obtain the heat flow rate and temperature change relation data of the pressurized shale sample;
and obtaining the specific heat capacity of the shale according to the heat flow rate and temperature change relation data of the blank sample, the standard rock sample and the pressurized shale sample.
The embodiment of the invention provides a device for determining specific heat capacity of shale, which is used for obtaining the specific heat capacity of the shale at a high-temperature stage and has high calculation precision, and the device comprises:
the first processing module is used for heating the blank sample and the standard rock sample to obtain the relation data of the heat flow rate and the temperature change of the blank sample and the standard rock sample;
the second processing module is used for carrying out pressurization processing on the shale sample;
the third processing module is used for heating the pressurized shale sample to obtain the relation data of the heat flow rate and the temperature change of the pressurized shale sample;
and the specific heat capacity calculation module is used for obtaining the specific heat capacity of the shale according to the heat flow rate and temperature change relation data of the blank sample, the standard rock sample and the pressurized shale sample.
The embodiment of the invention also provides computer equipment which comprises a memory, a processor and a computer program which is stored on the memory and can run on the processor, wherein the processor realizes the shale specific heat capacity determination method when executing the computer program.
An embodiment of the present invention further provides a computer-readable storage medium, where a computer program for executing the shale specific heat capacity determination method is stored in the computer-readable storage medium.
In the embodiment of the invention, a blank sample and a standard rock sample are subjected to heating treatment to obtain the relation data of the heat flow rate and the temperature change of the blank sample and the standard rock sample; pressurizing the shale sample; heating the pressurized shale sample to obtain the heat flow rate and temperature change relation data of the pressurized shale sample; and obtaining the specific heat capacity of the shale according to the heat flow rate and temperature change relation data of the blank sample, the standard rock sample and the pressurized shale sample. Through carrying out the pressurization to the shale sample, prevent that the shale sample from cracking in the heating process and producing mass loss, can improve the computational accuracy of shale specific heat capacity, then carry out the thermal treatment to the shale sample after the pressurization, heatable to the high temperature that is greater than 350 ℃ to can obtain the specific heat capacity of shale under the high temperature, and the computational accuracy is high.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts. In the drawings:
FIG. 1 is a flow chart of a method for determining specific heat capacity of shale according to an embodiment of the invention;
FIG. 2 is a schematic structural diagram of a shale specific heat capacity determination device in the embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention are further described in detail below with reference to the accompanying drawings. The exemplary embodiments and descriptions of the present invention are provided to explain the present invention, but not to limit the present invention.
Fig. 1 is a flowchart of a method for determining specific heat capacity of shale according to an embodiment of the present invention, and as shown in fig. 1, the method includes:
102, pressurizing a shale sample;
103, heating the pressurized shale sample to obtain the heat flow rate and temperature change relation data of the pressurized shale sample;
and 104, obtaining the specific heat capacity of the shale according to the heat flow rate and temperature change relation data of the blank sample, the standard rock sample and the pressurized shale sample.
As shown in figure 1, the shale sample is subjected to pressurization treatment, so that the shale sample is prevented from cracking in the heating process to generate mass loss, the calculation precision of the specific heat capacity of the shale can be improved, then the pressurized shale sample is subjected to heating treatment and can be heated to a high temperature higher than 350 ℃, and therefore the specific heat capacity of the shale at the high temperature can be obtained, and the calculation precision is high.
In an embodiment, before the blank sample and the standard rock sample are subjected to heating treatment to obtain the heat flow rate and temperature change relation data of the blank sample and the standard rock sample, the method may further include:
the method comprises the steps of processing a shale sample and a standard rock sample into a sample with a fixed shape, wherein the shale sample can be an original core or outcrop sample of shale, the standard rock sample can be a sapphire sample, and the fixed shape is related to a device for heating treatment, for example, a cylindrical crucible is used for heating, and a cylinder with the diameter of 4.8-4.9 mm and the height of 2-4 cm can be placed in the crucible, so that the shale sample and the standard rock sample are required to be processed into a cylinder with the same size. For example, shale cores may be prepared into a fixed shape using a wire-cutting process.
The heat treatment of the blank sample means that no sample is placed in the heat treatment apparatus when the heat treatment is performed.
In specific implementation, the blank sample and the standard rock sample can be respectively placed into a pressurizing crucible with a pressure valve, and then the pressurizing crucible with the pressure valve is placed into a differential scanning calorimeter for heating, the pressurizing crucible with the pressure valve can be made of high-temperature-resistant and pressure-resistant steel, and the pressure valve is installed at the top of the crucible through an external thread.
The specific process of putting the pressurized crucible with the pressure valve into the differential scanning calorimeter for heating can comprise the following steps:
starting the differential scanning calorimeter, waiting for 10 minutes to ensure that the temperature in the differential scanning calorimeter is stable, then putting a pressurizing crucible with a pressure valve, which is put into a blank sample (namely, no sample is put into the pressurizing crucible with the pressure valve), into the differential scanning calorimeter, wherein the temperature rise program of the differential scanning calorimeter adopts a certain temperature rise rate between 10 ℃/min and 20 ℃/min until the heating is carried out to a specified temperature, the specified temperature can be a high temperature between room temperature and 600 ℃, the specified upper limit temperature is determined through the bursting point of the crucible in a muffle furnace, finally, the heat flow rate and temperature change relation data of the blank sample are obtained, and when the differential scanning calorimeter is used for carrying out the heating treatment, the heat flow rate curve of the blank sample can be obtained, and the heat flow rate and temperature change relation data are recorded.
After obtaining the relation data of the heat flow rate and the temperature change of the blank sample, cooling the differential scanning calorimeter and the pressurizing crucible with the pressure valve to room temperature, then putting the standard rock sample into the pressurizing crucible with the pressure valve, putting the pressurizing crucible with the pressure valve into the differential scanning calorimeter, and obtaining the relation data of the heat flow rate and the temperature change of the standard rock sample by adopting the same heating treatment process as the blank sample, wherein the relation data of the heat flow rate and the temperature change of the standard rock sample can also be a heat flow rate curve.
In an embodiment, before the pressurizing the shale sample, the method may further include:
drying the shale sample;
carrying out vacuum degassing treatment on the dried shale sample;
the pressurizing treatment of the shale sample can comprise:
and (4) pressurizing the shale sample subjected to vacuum degassing treatment.
In specific implementation, the drying temperature for drying the shale sample can be 25 ℃ to ensure that the surface moisture is removed; then carrying out vacuum degassing treatment on the dried shale sample to prevent the shale sample from being oxidized; in order to ensure the stability of the shale sample, the shale sample after vacuum degassing treatment can be put into a drying oven for standby, and the drying oven can be an oven or related equipment with a drying function.
After the shale sample in the drying box is weighed, the shale sample subjected to vacuum degassing treatment is subjected to pressurization treatment so as to ensure the accuracy of the weight value of the shale sample, and the precision requirement of the weighing balance reaches one ten thousandth.
And pressurizing the shale sample subjected to vacuum degassing treatment, putting the shale sample into a crucible cooled to room temperature, and pressurizing the crucible by using a pressure valve. In one embodiment, the pressure valve can vertically pressurize the crucible to 10Mpa, so as to ensure that the sample does not have layer fracture in the subsequent heating process, thereby causing no quality loss.
And then, heating the pressurized shale sample to obtain the heat flow rate and temperature change relation data of the pressurized shale sample, wherein the specific process is the same as the process of obtaining the heat flow rate and temperature change relation data of the blank sample and the standard rock sample.
In an embodiment, obtaining the specific heat capacity of the shale according to the heat flow rate and temperature variation relation data of the blank sample, the standard rock sample and the pressurized shale sample may include:
and obtaining the specific heat capacity of the shale according to the heat flow rate curves of the blank sample, the standard rock sample and the pressurized shale sample.
In an embodiment, obtaining the specific heat capacity of the shale according to the heat flow rate curves of the blank sample, the standard rock sample and the pressurized shale sample may include:
obtaining a specific heat capacity value of a standard rock sample at a preset temperature, a weight value of the standard rock sample and a weight value of a shale sample, wherein the weight value of the shale sample is the weight value of the shale sample obtained by weighing the shale sample in a drying oven;
calculating the difference value of the heat flow rates of the blank sample and the standard rock sample at a preset temperature according to the heat flow rate curves of the blank sample and the standard rock sample;
calculating the difference value of the heat flow rate of the standard rock sample and the heat flow rate of the shale sample at a preset temperature according to the heat flow rate curves of the standard rock sample and the shale sample;
and calculating the specific heat capacity value of the shale sample at the preset temperature according to the specific heat capacity value of the standard rock sample at the preset temperature, the weight value of the standard rock sample, the weight value of the shale sample, the difference value of the heat flow rates of the blank sample and the standard rock sample at the preset temperature and the difference value of the heat flow rates of the standard rock sample and the shale sample at the preset temperature.
In one embodiment, the specific heat capacity value of the shale sample at the preset temperature can be calculated by the following formula:
Cp S ＝(Cp T ×△ S ×W T )/(△ T ×W S )
wherein Cp is S The specific heat capacity value of the shale sample at a preset temperature is obtained;
Cp T the specific heat capacity value of a standard rock sample at a preset temperature is obtained;
△ S the difference value of the heat flow rate of the standard rock sample and the shale sample at the preset temperature is obtained;
△ T the difference value of the heat flow rate of the blank sample and the standard rock sample at the preset temperature is taken as the difference value;
W T is a standard rock sample weight value;
W S the weight value of the shale sample is shown.
A specific example is given below to illustrate a specific application of the method for determining specific heat capacity of shale according to the embodiment of the present invention, wherein 4 kinds of shale samples in the berdos basin are selected, the sapphire sample is used as the standard rock sample, and the pressurized crucible of the pressure valve is used for heating, so that the shale core and the standard rock sample are first prepared into a cylindrical shape with a diameter of 4.8 mm to 4.9 mm and a height of 2 mm to 4 cm by using a wire cutting method.
Then, starting the differential scanning calorimeter, waiting for 10 minutes to ensure that the temperature in the differential scanning calorimeter is stable, then placing a pressurizing crucible with a pressure valve, which is placed into a blank sample (namely, no sample is placed into the pressurizing crucible with the pressure valve), into the differential scanning calorimeter, adopting a certain heating rate between 10 ℃/min and 20 ℃/min for the heating procedure of the differential scanning calorimeter until the temperature is 600 ℃, and finally obtaining a heat flow rate curve of the blank sample, wherein the heat flow rate curve records the heat flow rate between 25 ℃ and 600 ℃ and the temperature change relation data.
After obtaining the relation data of the blank sample heat flow rate and the temperature change, cooling the differential scanning calorimeter and the pressurizing crucible with the pressure valve to room temperature, then putting the standard rock sample into the pressurizing crucible with the pressure valve, putting the pressurizing crucible with the pressure valve into the differential scanning calorimeter, and adopting the same heating treatment process as the blank sample to obtain a heat flow rate curve of the standard rock sample, wherein the curve records the heat flow rate of the standard rock sample in the temperature change from 25 ℃ to 600 ℃.
Respectively drying 4 shale samples at 25 ℃ to ensure that surface moisture is removed; then carrying out vacuum degassing treatment on the 4 dried shale samples to prevent the shale samples from being oxidized; and in order to ensure the stability of the shale sample, putting the shale sample subjected to vacuum degassing treatment into a drying oven for standby.
After 4 kinds of shale samples in the drying oven are weighed, the shale samples subjected to vacuum degassing treatment are subjected to pressurization treatment, so that the accuracy of the weight value of the shale samples is ensured, and the precision requirement of a weighing balance reaches one ten thousandth.
Then, the following processing is respectively carried out on the 4 shale samples, and the heat flow rate curves of the 4 shale samples are obtained: vertically pressurizing the crucible by a pressure valve until the pressure reaches 10Mpa, then lowering the differential scanning calorimeter and the pressurized crucible with the pressure valve to room temperature, putting the pressurized crucible with the pressure valve, which is put into the shale sample, into the differential scanning calorimeter, wherein the temperature rise program of the differential scanning calorimeter adopts a certain temperature rise rate between 10 ℃/min and 20 ℃/min until the temperature is heated to 600 ℃, and finally obtaining a heat flow rate curve of the shale sample, wherein the curve records the heat flow rate of the shale sample in the temperature change from 25 ℃ to 600 ℃.
The specific heat capacity values of the 4 shale samples at 25 ℃ are respectively calculated by adopting the following formula:
Cp S ＝(Cp T ×△ S ×W T )/(△ T ×W S )
wherein Cp is S The specific heat capacity value of the shale sample at 25 ℃ is expressed in J/g.multidot.K;
Cp T is the specific heat capacity value of a standard rock sample at 25 ℃ and has the unit of J/g × K;
△ S is the difference in heat flow rate in milliwatts (mW) for the standard rock sample and the shale sample at 25 ℃;
△ T is the difference in heat flow rate in milliwatts (mW) for the blank sample and the standard rock sample at 25 ℃;
W T is a standard rock sample weight value in milligrams (mg);
W S is the weight value of the shale sample in milligrams (mg).
The specific heat capacity values of the 4 shale samples at 100 ℃, 200 ℃, 300 ℃, 400 ℃, 500 ℃ and 600 ℃ are respectively calculated by using the same formula, and the specific heat capacity values of the 4 shale samples at 7 temperatures are listed in Table 1.
TABLE 14 specific heat capacity values of shale samples at 7 temperatures
In the embodiment of the invention, the blank sample and the standard rock sample are heated to obtain the relation data of the heat flow rate and the temperature change of the blank sample and the standard rock sample; pressurizing the shale sample; heating the pressurized shale sample to obtain the heat flow rate and temperature change relation data of the pressurized shale sample; and obtaining the specific heat capacity of the shale according to the heat flow rate and temperature change relation data of the blank sample, the standard rock sample and the pressurized shale sample. Through carrying out pressurization to the shale sample, prevent that the shale sample from ftracturing in the heating process and producing mass loss, can improve the calculation accuracy of shale specific heat capacity, then carry out the heat treatment to the shale sample after pressurization, heatable is to the high temperature that is greater than 350 ℃ to can obtain the specific heat capacity of shale under high temperature, and calculation accuracy is high.
In addition, the shale sample is dried, so that the surface moisture can be removed, then the shale sample subjected to the drying treatment is subjected to vacuum degassing treatment to prevent the shale sample from being oxidized, the shale sample subjected to the vacuum degassing treatment can be put into a drying oven for standby application to ensure the stability of the shale sample, the shale sample in the drying oven is weighed, then the shale sample subjected to the vacuum degassing treatment is subjected to pressurization treatment, and the calculation precision of the quality of the shale sample can be improved through the processes. The pressure valve can vertically pressurize the crucible, and can ensure that the sample can not be cracked at the layer surface in the subsequent heating process, thereby not causing the quality loss and improving the calculation precision.
Based on the same inventive concept, the embodiment of the invention also provides a device for determining the specific heat capacity of the shale, which is implemented as follows. Because the principle of solving the problems is similar to that of a method for determining the specific heat capacity of the shale, the implementation of the device can refer to the implementation of the method, and repeated parts are not repeated.
Fig. 2 is a schematic structural diagram of a shale specific heat capacity determination apparatus in an embodiment of the present invention, and as shown in fig. 2, the apparatus includes:
the first processing module 201 is used for heating the blank sample and the standard rock sample to obtain data of relation between the heat flow rate and the temperature change of the blank sample and the standard rock sample;
a second processing module 202, configured to perform pressurization processing on the shale sample;
the third processing module 203 is configured to perform heating processing on the pressurized shale sample to obtain data of a relationship between a heat flow rate and a temperature change of the pressurized shale sample;
and the specific heat capacity calculation module 204 is configured to obtain the specific heat capacity of the shale according to the heat flow rate and temperature change relation data of the blank sample, the standard rock sample and the pressurized shale sample.
In an embodiment, the shale specific heat capacity determination apparatus further includes: the first sample processing module is used for processing the shale sample and the standard rock sample into a fixed-shape sample.
In an embodiment, the shale specific heat capacity determination apparatus further includes:
a second sample processing module to:
drying the shale sample;
carrying out vacuum degassing treatment on the dried shale sample;
a second processing module 202, further configured to:
and (4) pressurizing the shale sample subjected to vacuum degassing treatment.
In conclusion, in the embodiment of the invention, the blank sample and the standard rock sample are subjected to heating treatment, and the relation data of the heat flow rate and the temperature change of the blank sample and the standard rock sample is obtained; pressurizing the shale sample; heating the pressurized shale sample to obtain the heat flow rate and temperature change relation data of the pressurized shale sample; and obtaining the specific heat capacity of the shale according to the heat flow rate and temperature change relation data of the blank sample, the standard rock sample and the pressurized shale sample. Through carrying out pressurization to the shale sample, prevent that the shale sample from ftracturing in the heating process and producing mass loss, can improve the calculation accuracy of shale specific heat capacity, then carry out the heat treatment to the shale sample after pressurization, heatable is to the high temperature that is greater than 350 ℃ to can obtain the specific heat capacity of shale under high temperature, and calculation accuracy is high.
In addition, the shale sample is dried, so that the surface moisture can be removed, then the shale sample subjected to the drying treatment is subjected to vacuum degassing treatment to prevent the shale sample from being oxidized, the shale sample subjected to the vacuum degassing treatment can be put into a drying oven for standby application to ensure the stability of the shale sample, the shale sample in the drying oven is weighed, then the shale sample subjected to the vacuum degassing treatment is subjected to pressurization treatment, and the calculation precision of the quality of the shale sample can be improved through the processes. The pressure valve can vertically pressurize the crucible, and can ensure that the sample can not be cracked at the layer surface in the subsequent heating process, thereby not causing the quality loss and improving the calculation precision.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
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 (11)
1. A method for determining specific heat capacity of shale is characterized by comprising the following steps:
heating the blank sample and the standard rock sample to obtain the relation data of the heat flow rate and the temperature change of the blank sample and the standard rock sample;
pressurizing the shale sample;
heating the pressurized shale sample to obtain the heat flow rate and temperature change relation data of the pressurized shale sample;
obtaining specific heat capacity of the shale according to heat flow rate and temperature change relation data of the blank sample, the standard rock sample and the pressurized shale sample;
subjecting a shale sample to a pressure treatment comprising: putting a shale sample into a crucible, and vertically pressurizing the crucible by using a pressure valve;
obtaining specific heat capacity of the shale according to heat flow rate curves of the blank sample, the standard rock sample and the pressurized shale sample, wherein the specific heat capacity of the shale comprises the following steps: obtaining a specific heat capacity value of a standard rock sample at a preset temperature, a weight value of the standard rock sample and a weight value of a shale sample; calculating the difference value of the heat flow rates of the blank sample and the standard rock sample at a preset temperature according to the heat flow rate curves of the blank sample and the standard rock sample; calculating the difference value of the heat flow rate of the standard rock sample and the heat flow rate of the shale sample at a preset temperature according to the heat flow rate curves of the standard rock sample and the shale sample; and calculating the specific heat capacity value of the shale sample at the preset temperature according to the specific heat capacity value of the standard rock sample at the preset temperature, the weight value of the standard rock sample, the weight value of the shale sample, the difference value of the heat flow rates of the blank sample and the standard rock sample at the preset temperature and the difference value of the heat flow rates of the standard rock sample and the shale sample at the preset temperature.
2. The shale specific heat capacity determination method of claim 1, wherein before the blank sample and the standard rock sample are subjected to heating treatment to obtain the heat flow rate and temperature change relation data of the blank sample and the standard rock sample, the method further comprises the following steps:
the shale sample and the standard rock sample are processed into a fixed-shape sample.
3. The shale specific heat capacity determination method of claim 1, further comprising, prior to subjecting the shale sample to pressure treatment:
drying the shale sample;
carrying out vacuum degassing treatment on the dried shale sample;
subjecting a shale sample to a pressure treatment comprising:
and (4) pressurizing the shale sample subjected to vacuum degassing treatment.
4. The shale specific heat capacity determination method of claim 1, wherein the heat flow rate versus temperature data comprises a heat flow rate curve.
5. The shale specific heat capacity determination method of claim 4, wherein obtaining the shale specific heat capacity from heat flow rate versus temperature change data of blank samples, standard rock samples and pressurized shale samples comprises:
and obtaining the specific heat capacity of the shale according to the heat flow rate curves of the blank sample, the standard rock sample and the pressurized shale sample.
6. The shale specific heat capacity determination method of claim 1, wherein the specific heat capacity value of the shale sample at the preset temperature is calculated by the following formula:
Cp S =(Cp T ×△ S ×W T )/(△ T ×W S )
wherein Cp is S The specific heat capacity value of the shale sample at a preset temperature is obtained;
Cp T the specific heat capacity value of a standard rock sample at a preset temperature is obtained;
△ S the difference value of the heat flow rate of the standard rock sample and the shale sample at the preset temperature is obtained;
△ T the difference value of the heat flow rates of the blank sample and the standard rock sample at the preset temperature is obtained;
W T is a standard rock sample weight value;
W S the weight value of the shale sample is shown.
7. A shale specific heat capacity determination device, comprising:
the first processing module is used for heating the blank sample and the standard rock sample to obtain the relation data of the heat flow rate and the temperature change of the blank sample and the standard rock sample;
the second processing module is used for carrying out pressurization processing on the shale sample;
the third processing module is used for heating the pressurized shale sample to obtain the relation data of the heat flow rate and the temperature change of the pressurized shale sample;
the specific heat capacity calculation module is used for obtaining specific heat capacity of the shale according to heat flow rate and temperature change relation data of the blank sample, the standard rock sample and the mud shale sample after pressurization treatment;
the second processing module is specifically configured to: putting a shale sample into a crucible, and vertically pressurizing the crucible by using a pressure valve;
the specific heat capacity calculation module is specifically configured to: obtaining a specific heat capacity value of a standard rock sample at a preset temperature, a weight value of the standard rock sample and a weight value of a shale sample; calculating the difference value of the heat flow rates of the blank sample and the standard rock sample at a preset temperature according to the heat flow rate curves of the blank sample and the standard rock sample; calculating the difference value of the heat flow rates of the standard rock sample and the shale sample at a preset temperature according to the heat flow rate curves of the standard rock sample and the shale sample; and calculating the specific heat capacity value of the shale sample at the preset temperature according to the specific heat capacity value of the standard rock sample at the preset temperature, the weight value of the standard rock sample, the weight value of the shale sample, the difference value of the heat flow rates of the blank sample and the standard rock sample at the preset temperature and the difference value of the heat flow rates of the standard rock sample and the shale sample at the preset temperature.
8. The shale specific heat capacity determination apparatus of claim 7, further comprising:
the first sample processing module is used for processing the shale sample and the standard rock sample into a fixed-shape sample.
9. The shale specific heat capacity determination apparatus of claim 7, further comprising:
a second sample processing module to:
drying the shale sample;
carrying out vacuum degassing treatment on the dried shale sample;
a second processing module further configured to:
and (4) pressurizing the shale sample subjected to vacuum degassing treatment.
10. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the method of any one of claims 1 to 6 when executing the computer program.
11. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program for executing the method of any one of claims 1 to 6.
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