Background
In the process of measuring the porosity of a rock sample, a gas method is a more mature method for measuring the skeleton volume of the rock sample. The principle is as follows: according to Boyle's law, a mass of ideal gas, with a constant temperature, has a pressure inversely proportional to its volume. The standard chamber and the measuring chamber are connected by a pipeline, a gas pressure sensor (or a pressure gauge) and a valve are arranged on the pipeline, when a certain pressure (initial pressure P) is arranged in the standard chamber1 ) After the gas (air or nitrogen, etc.) is fed into the measuring chamber under isothermal conditions, the gas pressure will gradually drop until it stabilizes equilibrium, at which point the pressure is called equilibrium pressure (P2 )。
At this time, the following formula holds:
P1 *V1 ＝P2 *(V2 +V1 )-------------------------------------------(1)
wherein: v (V)1 Is the sum of the standard chamber and the line volume between the standard chamber and the valve;
V2 the sum of the volume of the measuring chamber and the pipeline between the measuring chamber and the valve;
when the skeleton volume is V3 When the rock sample is placed in the measuring chamber, the above procedure is repeated, and the following formula holds:
P1 *V1 ＝P2 *(V2 +V1 －V3 )
V3 ＝V2 +V1 -P1 *V1 /P2 ------------------------------------------(2)
it can be seen that due to V2 、V1 And P1 Are known, so long as the equilibrium pressure P of the gas after loading the rock sample is measured2 The rock sample skeleton volume and the equilibrium pressure P can be calculated by using the formula (2)2 Is a key parameter for accurately calculating the skeleton volume of the rock sample.
The operation process of the measuring method is as follows:
(1) And placing the rock sample into the measuring chamber, and screwing a top cover of the measuring chamber to enable a sealing ring on the top cover of the measuring chamber to be pressed and deformed to form a closed space.
(2) The valve is opened so that the gas with a certain pressure in the standard chamber enters the closed space of the measuring chamber.
(3) At this time, the gas continuously enters into the pores of the rock sample, the pressure of the gas is reduced, the pressure is stable after a period of time without gas leakage, and the balance is achieved, and the measured pressure is the balance pressure.
From the principle and operation process, the method has the advantages of simple instrument structure and simple and convenient operation. But also presents certain drawbacks and risks.
The sealing ring is one of key components for keeping tightness of the sealed space of the measuring chamber, and the time required for the pressure to reach stable balance is greatly different according to the rock sample in the process that the gas of the standard chamber enters the measuring chamber and enters the pore of the rock sample, and the pressure can reach balance only for a few minutes and a few tens of minutes. Is gas leakage at the seal ring during the gradual pressure drop? Is a normal pressure equalization process? The operator is difficult to judge, so that the working efficiency is reduced, and even the testing quality is affected.
Chinese patent (application No. 201210273356.3) provides a rock sample volume test system and a gas leakage monitoring method, which are used for monitoring gas leakage in real time in the process of measuring the rock sample skeleton volume by a gas method. The technical scheme is as follows: firstly, placing a standard chamber, a measuring chamber, pipelines, valves and the like involved in gas sealing in a relatively sealed box body, wherein the box body can be a relatively sealed machine box, and the front surface of the box body is provided with a door so as to facilitate the rock sample to be put in and taken out; secondly, a certain amount of trace gas is mixed into the measuring gas medium, and the trace gas has low content in the atmosphere and is easy to detect; thirdly, a tracer gas detection device is arranged inside or outside the box body, and the concentration change of the tracer gas in the box body is monitored and displayed in real time; and fourthly, setting an alarm value of the concentration variation of the trace gas, and once the concentration variation of the trace gas reaches the lower limit of the alarm value, indicating that the gas leaks, and prompting by a computer, stopping rock sample testing, checking a pipeline, determining the leakage position and performing sealing treatment. When the pressure of the gas is reduced and the computer does not alarm, the gas is slowly introduced into the micro-pores of the rock sample, the instrument is in a normal working state, and the pressure change condition can be observed with ease until the pressure is stable and balanced. However, in this method, since the trace gas is added to the measurement gas, the calculation result is affected to some extent when the skeleton volume is calculated by the pressure, and the measurement error is increased.
Aiming at the defects and possible risks existing in the determination of the rock sample skeleton volume, the invention provides a new technical scheme for ensuring the test working efficiency and the test quality.
Disclosure of Invention
The invention provides a rock sample skeleton volume measuring device and a rock sample skeleton volume measuring method, which are used for solving at least one technical problem.
A first aspect of the present invention provides a rock sample skeletal volume measuring device, comprising: a first gas path for measuring standard rock samples with known skeleton volumes and a second gas path for measuring rock samples to be measured with skeleton volumes to be measured,
the first gas path comprises a first measuring chamber for setting the standard rock sample, the first measuring chamber comprises a first cup body and a first top cover, and the first cup body and the first top cover are sealed through a first sealing ring; the second gas circuit comprises a second measuring chamber for setting the rock sample to be measured, the second measuring chamber comprises a second cup body and a second top cover, and the second cup body and the second top cover are sealed through a second sealing ring;
the first sealing ring and the second sealing ring are both charge-discharge sealing rings, and the first sealing ring is communicated with the second sealing ring.
In one embodiment, the first sealing ring and the second sealing ring are sealing rings with the same material and specification;
the first measuring chamber and the second measuring chamber are air chambers with the same material and specification.
In one embodiment, the charge-discharge type sealing ring is an inflatable sealing ring or a liquid-filling sealing ring.
In one embodiment, the filling device is connected with the filling port of the first sealing ring and the filling port of the second sealing ring through a conveying pipeline, and a conveying valve is arranged on the conveying pipeline.
In one embodiment, the first air path further comprises a first standard chamber, the outlet end of the first standard chamber is connected with the first measuring chamber through a pipeline, and a first valve is arranged on the pipeline between the first standard chamber and the first measuring chamber;
the second gas circuit further comprises a second standard chamber, the outlet end of the second standard chamber is connected with the second measuring chamber through a pipeline, and a second valve is arranged on the pipeline between the second standard chamber and the second measuring chamber;
the first standard chamber and the second standard chamber are air chambers with the same materials and specifications, the first standard chamber and the second standard chamber are connected through a pipeline, and a third valve is arranged on the pipeline between the first standard chamber and the second standard chamber.
In one embodiment, the device further comprises a gas source for providing measurement gas, wherein a gas source valve is arranged at the gas outlet end of the gas source, and the gas source valve is connected with the gas inlet end of the first standard chamber and the gas inlet end of the second standard chamber through corresponding pipelines respectively.
In one embodiment, the measurement gas is helium, nitrogen or air.
In one embodiment, the system further comprises a detection system, wherein the detection system comprises a control computing system and a first pressure sensor, a second pressure sensor, a third pressure sensor and a fourth pressure sensor which are connected with the control computing system,
the first pressure sensor is connected to a pipeline between the air source valve and the first standard chamber, the second pressure sensor is connected to a pipeline between the air source valve and the second standard chamber, the third pressure sensor is connected to a pipeline between the first valve and the first measuring chamber, and the fourth pressure sensor is connected to a pipeline between the second valve and the second measuring chamber.
A second aspect of the present invention provides a rock sample skeleton volume measuring method, which measures a rock sample skeleton volume by using the rock sample skeleton volume measuring device, comprising the steps of:
step 1: measuring the skeleton volume of the standard rock sample through the first air passage, and measuring the skeleton volume of the rock sample to be measured through the second air passage;
step 2: and comparing the measured value and the nominal value of the skeleton volume of the standard rock sample, and if the measured value and the nominal value of the skeleton volume of the standard rock sample are within the accuracy allowable error range, judging that the tightness of the rock sample skeleton volume measuring device is good, and accurately and reliably measuring the skeleton volume of the rock sample to be measured.
In one embodiment, step 1 comprises the sub-steps of:
step 11: placing a standard rock sample with a known skeleton volume into a first measuring chamber, and placing a rock sample to be measured with a skeleton volume to be measured into a second measuring chamber;
step 12: filling medium into the first sealing ring and the second sealing ring simultaneously through a filling device so as to seal the first measuring chamber and the second measuring chamber;
step 13: injecting measurement gas with preset pressure into the first standard chamber and the second standard chamber through gas sources respectively;
step 14: introducing the measurement gas in the first standard chamber into the first measurement chamber, and introducing the measurement gas in the second standard chamber into the second measurement chamber until the pressure of the first gas path and the second gas path reach balance, and respectively acquiring balance pressure data of the first gas path and the second gas path;
step 15: and respectively calculating the skeleton volume of the standard rock sample and the skeleton volume of the rock sample to be measured according to the acquired balance pressure data of the first gas path and the second gas path.
Compared with the prior art, the invention has the advantages that: the invention adopts the design of double gas paths, the first gas path is used for measuring the standard rock sample with the known skeleton volume, the second gas path is used for measuring the rock sample to be measured with the skeleton volume to be measured, wherein the sealing rings of the two measuring chambers have the characteristic of linkage, so that the measuring result of the standard rock sample can be used as the measuring result of the rock sample to be measured and the sign of device state judgment, thereby ensuring that the skeleton volume of the rock sample can be measured efficiently and accurately.
Detailed Description
The invention will be further described with reference to the accompanying drawings.
As shown in fig. 1, according to a first aspect of the present invention, a rock sample skeleton volume measuring device of the present invention includes: a first gas circuit for measuring standard rock samples with known skeleton volumes and a second gas circuit for measuring rock samples to be measured with skeleton volumes to be measured. The first gas path comprises a first measuring chamber 1 for setting a standard rock sample, the first measuring chamber 1 comprises a first cup 102 and a first top cover 103, and the first cup 102 and the first top cover 103 are sealed by a first sealing ring 101; the second gas circuit comprises a second measuring chamber 2 for setting a rock sample to be measured, the second measuring chamber 2 comprises a second cup 202 and a second top cover 203, and the second cup 202 and the second top cover 203 are sealed through a second sealing ring 201.
The first sealing ring 101 and the second sealing ring 201 are both charging and discharging sealing rings, and the first sealing ring 101 and the second sealing ring 201 are mutually communicated.
Prior to measurement, the skeletal volume of a standard rock sample is known, which can be represented by a nominal value; the standard rock sample is subjected to a first gas circuit measurement to obtain a measurement of the framework volume.
The rock sample skeleton volume measuring device provided by the invention has a double-gas-path structure, wherein the first gas path is used for measuring standard rock samples with known skeleton volumes, the second gas path is used for measuring the rock samples to be measured with the skeleton volumes to be measured, and the sealing rings of the two measuring chambers have the characteristic of linkage, so that the measuring result of the standard rock samples can be used as the measuring result of the rock samples to be measured and the sign of device state judgment, the automatic judgment of the device sealing state in the skeleton volume measuring process is realized, the intelligent level of the device is improved, and a new means is provided for quickly and accurately measuring the rock sample skeleton volumes and the porosities.
The filling medium is filled into the filling-discharging type sealing ring to expand the sealing ring, so that sealing is realized between the cup body and the top cover of the corresponding measuring chamber, and the sealing effect of the sealing ring can be ensured as long as the pressure inside the sealing ring is stable (leakage does not occur).
Example 1
In this embodiment, the first sealing ring 101 and the second sealing ring 201 are sealing rings with the same material and specification, and the first measuring chamber 1 and the second measuring chamber 2 are air chambers with the same material and specification, so that the standard rock sample and the rock sample to be measured are in the same environment.
Specifically, the charging-discharging type sealing ring is an inflatable sealing ring or a liquid-filling sealing ring.
The rock sample skeleton volume measuring device further comprises a filling device 3 for providing a filling medium, the filling device 3 is respectively connected with the filling port of the first sealing ring 101 and the filling port of the second sealing ring 201 through a conveying pipeline, and a conveying valve 4 is arranged on the conveying pipeline.
In other words, if the charge-discharge type seal ring is an inflatable seal ring, the filling medium supplied from the filling device 3 is gas accordingly. If the filling-discharging type sealing ring is a liquid filling type sealing ring, correspondingly, the filling medium provided by the filling device 3 is liquid. Preferably, the first sealing ring 101 and the second sealing ring 201 are inflatable sealing rings, and correspondingly, the filling device 3 is an air source 10 or an air pump.
The first seal ring 101 and the second seal ring 201 are connected by a pipeline, and a transfer pipeline of the filling device 3 is connected to a pipeline between the first seal ring 101 and the second seal ring 201, preferably at an intermediate position on the pipeline.
Preferably, as shown in fig. 1, the first measuring chamber 1 is disposed in a first supporting seat, a first pressurizing rod is disposed at the top of the first top cover 103, the first pressurizing rod is in threaded connection with the top of the first supporting seat, and the first top cover 103 can be driven to move along the vertical direction by rotating the first pressurizing rod so as to adjust the distance between the first top cover 103 and the first cup 102, thereby controlling the opening and closing of the first top cover 103. Likewise, the second measuring chamber 2 is disposed in the second supporting seat, and the top of the second top cover 203 is provided with a second pressurizing rod, which is screwed on the top of the second supporting seat, and the second top cover 203 can be driven to move along the vertical direction by rotating the second pressurizing rod so as to adjust the distance between the second top cover 203 and the second cup 202, thereby controlling the opening and closing of the second top cover 203.
Example two
The description of the present embodiment is different from the above embodiment, and the same points will not be repeated.
In this embodiment, the first air path further includes a first standard chamber 5, the outlet end of the first standard chamber 5 is connected to the first measurement chamber 1 through a pipeline, and a first valve 7 is disposed on the pipeline between the first standard chamber 5 and the first measurement chamber 1. The second gas circuit also comprises a second standard chamber 6, the outlet end of the second standard chamber 6 is connected with the second measuring chamber 2 through a pipeline, and a second valve 8 is arranged on the pipeline between the second standard chamber 6 and the second measuring chamber 2.
The first standard chamber 5 and the second standard chamber 6 are air chambers with the same material and specification, the first standard chamber 5 and the second standard chamber 6 are connected through a pipeline, and a third valve 9 is arranged on the pipeline between the first standard chamber 5 and the second standard chamber 6.
In addition, the pipeline in the first air path and the pipeline in the second air path are the same in terms of materials, specifications and volumes.
In this embodiment, the first standard chamber 5 and the second standard chamber 6 are the same air chamber, and after the third valve 9 is opened, the first standard chamber 5 and the second standard chamber 6 can be mutually communicated, so that the same-pressure air can be ensured to be introduced into the first standard chamber 5 and the second standard chamber 6, and further the first air path and the second air path have the same testing environment and initial air pressure, and the accuracy of rock sample skeleton measurement is improved.
The rock sample skeleton volume measuring device further comprises an air source 10 for providing measuring air, an air outlet end of the air source 10 is provided with an air source valve 11, and the air source valve 11 is respectively connected with an air inlet end of the first standard chamber 5 and an air inlet end of the second standard chamber 6 through corresponding pipelines.
In other words, the gas source 10 provides a gas at a certain pressure to the device as a measurement medium. Specifically, the measurement gas provided by the gas source 10 is helium, nitrogen or air.
Example III
The description of the present embodiment is different from the above embodiment, and the same points will not be repeated.
In this embodiment, the rock sample skeleton volume measuring device further includes a detection system. The detection system comprises a control computing system 12 and a first pressure sensor 13, a second pressure sensor 14, a third pressure sensor 15 and a fourth pressure sensor 16 connected to the control computing system 12. A first pressure sensor 13 is connected to the line between the gas source valve 11 and the first standard chamber 5, a second pressure sensor 14 is connected to the line between the gas source valve 11 and the second standard chamber 6, a third pressure sensor 15 is connected to the line between the first valve 7 and the first measuring chamber 1, and a fourth pressure sensor 16 is connected to the line between the second valve 8 and the second measuring chamber 2.
The pressure sensor detects the gas pressure at the corresponding position in the testing process and is used for calculating the volume of the rock sample skeleton. The control computing system 12 is used for receiving and converting signals of the gas pressure sensor, calculating the volume of the rock sample skeleton, and the like.
As shown in fig. 2, according to a second aspect of the present invention, the rock sample skeleton volume measuring method of the present invention, which is a method for measuring the volume of a rock sample skeleton by using the rock sample skeleton volume measuring device, comprises the steps of:
step 1: and measuring the skeleton volume of the standard rock sample through the first gas circuit, and measuring the skeleton volume of the rock sample to be measured through the second gas circuit.
Step 2: and comparing the measured value and the nominal value of the skeleton volume of the standard rock sample, and if the measured value and the nominal value of the skeleton volume of the standard rock sample are within the accuracy allowable error range, judging that the tightness of the rock sample skeleton volume measuring device is good, and accurately and reliably measuring the skeleton volume of the rock sample to be measured.
According to the rock sample skeleton volume measuring method, skeleton volume measurement is simultaneously carried out through the double air paths, the first air path is used for measuring standard rock samples with known skeleton volumes, the second air path is used for measuring rock samples with to-be-measured skeleton volumes, and sealing rings of the two measuring chambers have the characteristic of linkage, so that the measuring result of the standard rock samples can be used as a measuring result of the rock samples to be measured and a sign for device state judgment, and therefore efficient and accurate measurement of the rock sample skeleton volumes can be achieved.
Specifically, step 1 comprises the following sub-steps:
step 11: a standard rock sample of known framework volume is placed in a first measuring chamber 1 and a rock sample to be measured of framework volume to be measured is placed in a second measuring chamber 2.
Step 12: the first sealing ring 101 and the second sealing ring 201 are simultaneously filled with a filling medium by the filling device 3 to seal the first measuring chamber 1 and the second measuring chamber 2.
Step 13: the first standard chamber 5 and the second standard chamber 6 are respectively filled with a measuring gas of a preset pressure through a gas source 10.
Step 14: and (3) introducing the measurement gas in the first standard chamber 5 into the first measurement chamber 1, and introducing the measurement gas in the second standard chamber 6 into the second measurement chamber 2 until the pressures of the first gas path and the second gas path reach balance, and respectively collecting the balance pressure data of the first gas path and the second gas path.
Step 15: and respectively calculating the skeleton volume of the standard rock sample and the skeleton volume of the rock sample to be measured according to the acquired balance pressure data of the first gas path and the second gas path.
Example IV
The flow of the rock sample skeleton volume measurement by using the rock sample skeleton volume measurement device of the present invention will be specifically described below.
(1) Standard rock samples with known skeleton volumes are placed into the first cup 102, the first top cover 103 is adjusted to a corresponding position by rotating the first pressurizing rod, so that the first sealing ring 101 can be tightly attached to the first top cover 103 and the first cup 102 after being inflated, and a closed space is formed between the first top cover 103 and the first cup 102.
(2) And placing the rock sample to be tested into the second cup 202, rotating the second pressurizing rod to adjust the second top cover 203 to a corresponding position, so that the second sealing ring 201 can be tightly attached to the second top cover 203 and the second cup 202 after being inflated, and a closed space is formed between the second top cover 203 and the second cup 202.
(3) The transfer valve 4 is put in an open state, the filling device 3 is activated, the first seal ring 101 and the second seal ring 201 are put in an inflated sealing state, and then the filling device 3 and the transfer valve 4 are closed.
(4) The first valve 7 and the second valve 8 are closed, the gas source valve 11 is opened, the measurement gas is made to enter the first standard chamber 5 and the second standard chamber 6, and the third valve 9 is made to be in an open state.
(5) After the pressures measured by the first pressure sensor 13 and the second pressure sensor 14 are stabilized, the pressure data (initial pressure) at this time is recorded, and the air source valve 11 and the third valve 9 are closed.
(6) The first valve 7 and the second valve 8 are opened, so that the measured gases in the first standard chamber 5 and the second measuring chamber 2 respectively enter the first measuring chamber 1 and the first measuring chamber 1, the gas pressures measured by the third pressure sensor 15 and the fourth pressure sensor 16 are reduced until the gas pressures are stable, and the pressure data at the moment is recorded, wherein the pressure at the moment is the balance pressure.
(7) The control computing system 12 calculates the skeleton volume of a standard rock sample of known skeleton volume and the skeleton volume of the rock sample to be measured from the detected pressure data and the like.
(8) And comparing the skeleton volume measured value of the standard rock sample with the nominal value, and if the measured value is within the range of the precision allowable error, indicating that equipment is normal in the testing process, wherein the measured value of the rock sample to be tested can be adopted. Otherwise, the abnormal equipment in the test process is indicated, and the measured value of the rock sample to be tested cannot be adopted.
(9) And opening the conveying valve 4, unloading the gas in the first sealing ring 101 and the second sealing ring 201, taking out the standard rock sample and the rock sample to be tested, and ending the test.
Example five
Standard rock samples with known skeleton volumes are placed into the first cup 102, the first top cover 103 is adjusted to a corresponding position by rotating the first pressurizing rod, so that the first sealing ring 101 can be tightly attached to the first top cover 103 and the first cup 102 after being inflated, and a closed space is formed between the first top cover 103 and the first cup 102. And placing the rock sample to be tested into the second cup 202, rotating the second pressurizing rod to adjust the second top cover 203 to a corresponding position, so that the second sealing ring 201 can be tightly attached to the second top cover 203 and the second cup 202 after being inflated, and a closed space is formed between the second top cover 203 and the second cup 202. The transfer valve 4 is put in an open state, the filling device 3 is activated, the first seal ring 101 and the second seal ring 201 are put in an inflated sealing state, and then the filling device 3 and the transfer valve 4 are closed. The first valve 7 and the second valve 8 are closed, the gas source valve 11 is opened, the measurement gas is made to enter the first standard chamber 5 and the second standard chamber 6, and the third valve 9 is made to be in an open state. After the pressures measured by the first pressure sensor 13 and the second pressure sensor 14 are stabilized, the pressure data (initial pressure) at this time is recorded, and the air source valve 11 and the third valve 9 are closed. The first valve 7 and the second valve 8 are opened, so that the measured gases in the first standard chamber 5 and the second measuring chamber 2 respectively enter the first measuring chamber 1 and the first measuring chamber 1, the gas pressures measured by the third pressure sensor 15 and the fourth pressure sensor 16 are reduced until the gas pressures are stable, and the pressure data at the moment is recorded, wherein the pressure at the moment is the balance pressure. The control computing system 12 calculates the skeleton volume of a standard rock sample of known skeleton volume and the skeleton volume of the rock sample to be measured from the detected pressure data and the like. The measured value of the skeleton volume of the standard rock sample with the known skeleton volume is compared with the nominal value, and the relative error is less than 0.5%. The standard rock sample test result is accurate, the equipment is normal in the test process, and the measured value of the rock sample to be tested can be adopted. And opening the conveying valve 4, unloading the gas in the first sealing ring 101 and the second sealing ring 201, taking out the standard rock sample and the rock sample to be tested, and ending the test.
Example six
Standard rock samples with known skeleton volumes are placed into the first cup 102, the first top cover 103 is adjusted to a corresponding position by rotating the first pressurizing rod, so that the first sealing ring 101 can be tightly attached to the first top cover 103 and the first cup 102 after being inflated, and a closed space is formed between the first top cover 103 and the first cup 102. And placing the rock sample to be tested into the second cup 202, rotating the second pressurizing rod to adjust the second top cover 203 to a corresponding position, so that the second sealing ring 201 can be tightly attached to the second top cover 203 and the second cup 202 after being inflated, and a closed space is formed between the second top cover 203 and the second cup 202. The transfer valve 4 is put in an open state, the filling device 3 is activated, the first seal ring 101 and the second seal ring 201 are put in an inflated sealing state, and then the filling device 3 and the transfer valve 4 are closed. The first valve 7 and the second valve 8 are closed, the gas source valve 11 is opened, the measurement gas is made to enter the first standard chamber 5 and the second standard chamber 6, and the third valve 9 is made to be in an open state. After the pressures measured by the first pressure sensor 13 and the second pressure sensor 14 are stabilized, the pressure data (initial pressure) at this time is recorded, and the air source valve 11 and the third valve 9 are closed. The first valve 7 and the second valve 8 are opened, so that the measured gases in the first standard chamber 5 and the second measuring chamber 2 respectively enter the first measuring chamber 1 and the first measuring chamber 1, the gas pressures measured by the third pressure sensor 15 and the fourth pressure sensor 16 are reduced until the gas pressures are stable, and the pressure data at the moment is recorded, wherein the pressure at the moment is the balance pressure. The control computing system 12 calculates the skeleton volume of a standard rock sample of known skeleton volume and the skeleton volume of the rock sample to be measured from the detected pressure data and the like. The measured value of the skeleton volume of the standard rock sample with the known skeleton volume is compared with the nominal value, and the measured value is larger than the nominal value, and the relative error is larger than 0.5%. The standard rock sample test result has larger deviation, the leakage condition of the sealing ring possibly exists in the test process, and the measured value of the rock sample to be tested cannot be adopted. And opening the conveying valve 4, unloading the gas in the first sealing ring 101 and the second sealing ring 201, taking out the standard rock sample and the rock sample to be tested, and ending the test.
As a specific application example: in the rock sample testing process, the control computing system 12 is used for collecting pressure change curves of the first measuring chamber 1 and the second measuring chamber 2, when the standard rock sample with the known skeleton volume and the rock sample to be tested have similar properties such as mineral composition, and the initial gas pressure and the testing environment of the two are the same, the comparison analysis of the pressure change curves has positive significance for the comparison research of the permeability and the pore structure of the two.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "connected," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; may be a mechanical connection; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature.
While the invention has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.