Rock sample volume measuring device, measuring method and system

Abstract

The present application provides a kind of rock sample volume measuring device, measuring method and system, the device includes: measuring container, it includes container body and cover the cover of the mouth of the container body, the first sealed space is in the container body, the end surface between the cover and the mouth of the container body is concentrically provided with first sealing ring and second sealing ring and encloses second sealed space;Reference container, it is communicated the first sealed space by input pipeline;Pressure detection component, it includes the first pressure sensor being arranged on the input pipeline and the second pressure sensor being arranged in second sealed space.The technical scheme based on the present application, according to the pressure change condition detection result of the second sealed space at sealing ring structure, the sealing property of sealing ring structure can be accurately reflected, and then the accuracy of the balanced pressure value in the first sealed space is reflected, to realize efficient, accurate rock sample volume determination provides new means.

Description

Technical Field

[0001] This invention relates to the field of rock sample porosity measurement technology, and particularly to a rock sample volume measuring device, measuring method and system. Background Technology

[0002] In the process of determining the porosity of rock samples, the gas method is a relatively mature method for measuring the volume of the rock sample entity (skeleton). Its principle is: according to Boyle's law, for a given mass of ideal gas at constant temperature, its pressure is inversely proportional to its volume. A reference chamber and a rock sample chamber are connected by a pipeline equipped with a gas pressure sensor (or pressure gauge) and a valve. When a gas (air or nitrogen, etc.) at a certain pressure (P1) is introduced into the reference chamber, and under isothermal conditions, the gas is transported to the rock sample chamber, the gas pressure will decrease until equilibrium is reached; this pressure is called the equilibrium pressure (P2). At this point, the following formula holds:

[0003] P1*V1=P2*(V2+V1) (1)

[0004] Where: V1 is the sum of the volumes of the reference chamber and the pipeline from the reference chamber to the valve; V2 is the sum of the volumes of the rock sample chamber and the pipeline from the rock sample chamber to the valve;

[0005] When a rock sample with a volume of V3 is placed into the sample chamber, and the above process is repeated, the following formula holds true:

[0006] P1*V1=P2*(V2+V1-V3)V3=V2+V1-P1*V1 / P2 (2)

[0007] Therefore, since V2, V1 and P1 are all known, as long as the equilibrium pressure P2 after the rock sample is loaded is measured, the volume of the rock sample can be calculated using formula (2). The equilibrium pressure P2 is the key parameter for accurately calculating the volume of the rock sample.

[0008] From the perspective of principle and operation, the advantages of this method are its simple instrument structure and ease of operation. However, it also has certain drawbacks and risks.

[0009] Specifically, the sealing ring is one of the key components for maintaining the airtightness of the sealed space in the measuring device. During the process of gas entering the measuring chamber from the reference chamber and then into the pores of the rock sample, the time required for pressure to reach equilibrium varies greatly depending on the rock sample; some require only a few minutes, while others take tens of minutes. During this process, it is difficult for operators to determine whether the prolonged time is due to gas leakage at the sealing ring or simply a normal equilibrium process, thus affecting work efficiency and even test quality.

[0010] Currently, there are methods for real-time monitoring of gas leakage during the gas method for measuring the volume of rock samples. These methods employ the following technical solutions: First, the reference chamber, rock sample chamber, and all pipelines and valves involved in the gas sealing are placed in a relatively sealed enclosure. This enclosure can be a relatively sealed chassis with a door on the front for easy insertion and removal of rock samples. Second, a certain amount of tracer gas is mixed into the measuring gas medium. This tracer gas has a low concentration in the atmosphere and is easily detected. Third, a tracer gas detection device is installed inside or outside the enclosure to monitor and display changes in the concentration of the tracer gas in real time. Fourth, an alarm value is set for the change in tracer gas concentration. Once the change in tracer gas concentration reaches the lower limit of the alarm value, it indicates gas leakage, and the computer will issue an alarm. Rock sample testing should then be stopped, pipelines inspected, the leak location identified, and sealing measures implemented. If the gas pressure drops but the computer does not alarm, it indicates that gas is slowly entering the tiny pores of the rock sample, and the instrument is functioning normally. Pressure changes can be observed safely until pressure equilibrium is reached. While this approach can monitor the device's sealing performance, it requires additional tracer gas and corresponding detection components, resulting in a complex measurement device structure.

[0011] Therefore, this invention proposes a rock sample volume measurement device, measurement method and system based on a novel gas leakage monitoring method, which enables the sealing performance of the device's sealing structure to be monitored in real time, thereby ensuring testing efficiency and testing quality. Summary of the Invention

[0012] To address the problems in the prior art, this application proposes a rock sample volume measuring device, measuring method, and system.

[0013] In a first aspect, the present invention provides a rock sample volume measuring device, comprising:

[0014] A measuring container includes a container body and a cover that covers the opening of the container body. The container body has a first sealed space. A first sealing ring and a second sealing ring are concentrically arranged between the end faces of the cover and the opening of the container body to form a second sealed space.

[0015] A reference container, which is connected to the first enclosed space via an input pipeline;

[0016] The pressure detection assembly includes a first pressure sensor disposed on the input pipeline and a second pressure sensor disposed in the second enclosed space.

[0017] In one implementation, it further includes:

[0018] A pressurizing assembly having a pressurizing component connected to the lid, the pressurizing component being capable of applying pressure to the lid to press the lid tightly against the container body.

[0019] In one embodiment, the pressurizing assembly includes a fixed bracket and a pressurizing screw that serves as the pressurizing component, the pressurizing screw engaging with a screw hole on the fixed bracket.

[0020] In one embodiment, a first groove and a second groove are provided on the end face of the container body opening and / or the surface of the cover, and the first sealing ring and the second sealing ring are respectively partially accommodated in the first groove and the second groove.

[0021] In one embodiment, a control valve is provided on the input pipeline.

[0022] Secondly, the present invention proposes a method for measuring the volume of a rock sample, applied to the aforementioned rock sample volume measuring device, comprising the following steps:

[0023] The rock sample is placed into the first sealed space of the measuring container, and the lid of the measuring container is closed onto its body to form a second sealed space.

[0024] Gas with a certain pressure from a reference container is introduced into the first sealed space, and a pressure equilibrium state is reached after a certain period of equilibration.

[0025] Obtain the first pressure value in the first sealed space under the pressure balance state, and continuously obtain the second pressure value of the second sealed space during the balance process and determine its change during the balance process;

[0026] Based on the change in the second pressure value, determine whether to output the first pressure value as a calculation parameter for the rock sample volume.

[0027] In one implementation, determining whether to output the first pressure value as a calculation parameter for the rock sample volume based on the change in the second pressure value includes:

[0028] If the second pressure value fluctuates around a certain value and the fluctuation range is within a preset range, then the first pressure value is determined to be output as the calculation parameter for the rock sample volume.

[0029] If the second pressure value increases continuously over a period of time, then the first pressure value will not be output as a parameter for calculating the rock sample volume.

[0030] In one implementation, after determining that the first pressure value should not be output as a parameter for calculating the rock sample volume, the method further includes:

[0031] Replace the first sealing ring on the cover that forms the second sealed space and is close to the center of the cover, and remeasure the volume of the rock sample.

[0032] Thirdly, the present invention proposes a rock sample volume measurement system, which includes the aforementioned rock sample volume measurement device, and thus possesses all the technical effects it has.

[0033] In one embodiment, a control device is also included, which is electrically connected to the pressure detection component in the measuring device.

[0034] The above-mentioned technical features can be combined in various suitable ways or replaced by equivalent technical features, as long as the purpose of the present invention can be achieved.

[0035] The rock sample volume measuring device, method, and system provided by this invention have at least the following advantages compared with the prior art:

[0036] This invention discloses a rock sample volume measuring device, method, and system. Two independent sealed spaces, a first sealed space and a second sealed space, are constructed within a measuring container for measurement and sealing performance monitoring, respectively. During the measurement process, the pressure change in the second sealed space at the sealing ring structure accurately reflects the sealing performance of the sealing ring structure, thereby reflecting the accuracy of the equilibrium pressure value in the first sealed space. This provides a new means for achieving efficient and accurate rock sample volume determination. Attached Figure Description

[0037] The invention will now be described in more detail with reference to embodiments and the accompanying drawings.

[0038] Figure 1 A schematic diagram of the measuring device of the present invention is shown.

[0039] In the accompanying drawings, the same parts use the same reference numerals. The drawings are not to scale.

[0040] Figure label:

[0041] 1-Reference container, 2-Control valve, 3-First sealed space, 4-Cover, 5-Container body, 6-Pressure screw, 7-Fixed bracket, 8-First sealing ring, 9-Second sealing ring, 10-Second sealed space, 11-Second pressure sensor, 12-First pressure sensor, 13-Control device. Detailed Implementation

[0042] The invention will now be further described with reference to the accompanying drawings.

[0043] Example 1

[0044] An embodiment of the present invention provides a rock sample volume measuring device, comprising:

[0045] The measuring container includes a container body 5 and a cover 4 that covers the opening of the container body 5. The container body 5 has a first sealed space 3. A first sealing ring 8 and a second sealing ring 9 are concentrically arranged between the end faces of the cover 4 and the opening of the container body 5 to form a second sealed space 10.

[0046] Reference container 1 is connected to the first enclosed space 3 via an input pipeline;

[0047] The pressure detection assembly includes a first pressure sensor 12 disposed on the input pipeline and a second pressure sensor 11 disposed in the second enclosed space 10.

[0048] Specifically, as shown in the attached diagram. Figure 1 As shown, the measuring device of the present invention mainly includes three parts: a measuring container, a reference container 1, and a pressure detection component. The measuring container internally forms a first sealed space 3 for measurement and a second sealed space 10 for determining airtightness. The reference container 1 is used to introduce gas into the first sealed space 3. The first pressure sensor 12 and the second pressure sensor 11 in the pressure detection component are used to detect the pressure values ​​and pressure changes in the first sealed space 3 and the second sealed space 10, respectively.

[0049] Specifically, the working principle of the rock sample volume measuring device of the present invention is as follows:

[0050] First, the rock sample is placed into the measuring container, and the container body 5 and the cover 4 are assembled. A first sealing ring 8 and a second sealing ring 9 are placed at the mating position between the two. The container body 5 and the cover 4 form a first sealed space 3, and a second sealed space 10 is formed between the first sealing ring 8 and the second sealing ring 9. The rock sample is located in the first sealed space 3. The double seal of the first sealing ring 8 and the second sealing ring 9 can improve and strengthen the sealing performance. At the same time, the second sealed space 10 formed by the first sealing ring 8 and the second sealing ring 9, together with a corresponding pressure sensor, can actively monitor the sealing performance of the measuring container.

[0051] Next, the reference container 1 is connected to the first sealed space 3 through the input pipeline, and at the same time, the two first pressure sensors 12 and the second pressure sensor 11 in the pressure detection assembly are checked to be in place.

[0052] Then, the reference container 1 is introduced into the first sealed space 3 through the input pipeline, and after a certain period of time, the pressure in the first sealed space 3 and the second sealed space 10 are detected by the first pressure sensor 12 and the second pressure sensor 11 respectively, and the corresponding pressure values ​​are obtained.

[0053] Finally, the pressure conditions are used to determine whether the measuring container is properly sealed, and the volume of the rock sample is calculated based on the corresponding pressure value when the seal is good.

[0054] Preferably, a control valve 2 is provided on the input pipeline. The control valve 2 is used to control the opening and closing of the input pipeline, thereby controlling the input of gas and controlling the start of the measurement process.

[0055] The pressure conditions in the first enclosed space 3 and the second enclosed space 10 are at least two of the following possibilities:

[0056] (1) After a certain period of balancing process, the first pressure sensor 12 detects that the pressure in the first sealed space 3 has reached a balanced state and obtains the first pressure value of the balanced state. During the balancing process, the second pressure sensor 11 continuously detects the changes in the second sealed space 10 and detects that the pressure value in the second sealed space 10 is stable around a certain value, with slight fluctuations.

[0057] This indicates that the measuring container is well-sealed, the measurement process is effective, and the value of the first pressure can be used as calculation data for the rock sample volume.

[0058] (2) After a certain period of balancing process, the first pressure sensor 12 detects that the pressure in the first sealed space 3 has reached a balanced state and obtains the first pressure value of the balanced state. During the balancing process, the second pressure sensor 11 continuously detects the changes in the second sealed space 10 and detects that the pressure value in the second sealed space 10 is continuously increasing, and the value continues to increase as time goes by during the balancing process.

[0059] This indicates that the measuring container is poorly sealed, with the second sealing ring 9 being well-sealed while the first sealing ring 8 is poorly sealed, rendering the measurement process invalid. The value of the first pressure cannot be used as data for calculating the rock sample volume.

[0060] Furthermore, the pressure conditions in the first enclosed space 3 and the second enclosed space 10 have at least the following third possibility:

[0061] (3) After a certain period of balancing process, the first pressure sensor 12 detects that the pressure in the first sealed space 3 has reached a balanced state and obtains the first pressure value of the balanced state. However, the time taken for the balancing process and the first pressure value of the balanced state both exceed the normal range. During the balancing process, the second pressure sensor 11 continuously detects the changes in the second sealed space 10 and detects that the pressure value in the second sealed space 10 first increases and then decreases, with the fluctuation exceeding the normal range.

[0062] This indicates that the measuring container is poorly sealed, with both the first sealing ring 8 and the second sealing ring 9 failing to seal properly. The measurement process is invalid, and the value of the first pressure cannot be used as data for calculating the volume of the rock sample.

[0063] The measuring device of this invention is also based on the gas method for measuring the volume of rock samples. The principle of the gas method is: according to Boyle's law, for a given mass of ideal gas, under constant temperature, its pressure is inversely proportional to its volume. The reference container 1 is connected to the first sealed space 3 of the measuring container via an input pipeline. A gas (air or nitrogen, etc.) at a certain pressure (P1) is introduced into the reference container 1. Under isothermal conditions, the gas is delivered to the first sealed space 3 of the measuring container. The gas pressure will decrease until equilibrium is reached; this pressure is called the equilibrium pressure (P2).

[0064] At this point, the following formula holds true:

[0065] P1*V1=P2*(V2+V1)

[0066] Where: V1 is the sum of the volumes of the reference container 1 and the input pipeline between the reference container 1 and the control valve 2 on the input pipeline; V2 is the sum of the volumes of the measuring container and the input pipeline between the measuring container and the control valve 2 on the input pipeline;

[0067] During the actual measurement, when placing a rock sample with a volume of V3 into the rock sample chamber, the above process is repeated, and the following formula holds true:

[0068] P1*V1=P2*(V2+V1-V3)

[0069] V3 = V2 + V1 - P1 * V1 / P2

[0070] Therefore, since V2, V1, and P1 are all known, as long as the equilibrium pressure P2 after the rock sample is loaded is measured, the solid volume V3 of the rock sample can be calculated using the above formula. The equilibrium pressure P2 is the key parameter for accurately calculating the solid volume of the rock sample, and the accuracy of this key parameter is determined by the pressure changes in the second sealed space 10.

[0071] Furthermore, it also includes:

[0072] The pressurizing assembly has a pressurizing component connected to the cover 4, which is capable of applying pressure to the cover 4 to press the cover 4 tightly against the container body 5.

[0073] The pressurizing assembly includes a fixed bracket 7 and a pressurizing screw 6 as a pressurizing component, the pressurizing screw 6 engaging with a screw hole on the fixed bracket 7.

[0074] Specifically, as shown in the attached diagram. Figure 1As shown, the pressurizing assembly applies pressure to the lid 4, ensuring that the lid 4 is pressed tightly against the container body 5, thus guaranteeing the sealing of the measuring container from the assembly structure. Specifically, the pressurizing screw 6 is rotated and pressed against the center of the lid 4. Further rotation of the pressurizing screw 6, under the action of the threaded engagement between the screw and the screw hole, causes the pressurizing screw 6 to extend further and compress the lid 4, pressing it tightly against the container body 5. At this time, the first sealing ring 8 and the second sealing ring 9 between the lid 4 and the container body 5 undergo elastic deformation, ensuring the sealing between them.

[0075] Furthermore, a first groove and a second groove are provided on the end face of the opening of the container body 5 and / or the surface of the cover 4, and the first sealing ring 8 and the second sealing ring 9 are respectively partially accommodated in the first groove and the second groove.

[0076] Specifically, as shown in the attached diagram. Figure 1 As shown, the first sealing ring 8 and the second sealing ring 9 are located between the opening end faces of the lid 4 and the container body 5. To ensure that the first sealing ring 8 and the second sealing ring 9 can be installed in place and their positions are relatively fixed, a first groove and a second groove are formed on the opening end face of the container body 5 and / or the surface of the lid 4, which can partially accommodate the first sealing ring 8 and the second sealing ring 9 respectively, thereby achieving the positioning of the first sealing ring 8 and the second sealing ring 9. In this embodiment, refer to the accompanying drawings. Figure 1 The first groove and the second groove are formed on the surface of the cover 4.

[0077] Furthermore, the first sealing ring 8 and the second sealing ring 9 are preferably simply placed in the first groove and the second groove, with only a positional relationship and no other connection relationship, which facilitates the replacement of the sealing rings.

[0078] Example 2

[0079] An embodiment of the present invention provides a method for measuring the volume of a rock sample, applied to the aforementioned rock sample volume measuring device, comprising the following steps:

[0080] Step S100: Place the rock sample into the first sealed space of the measuring container, so that the lid of the measuring container covers its container body and forms a second sealed space;

[0081] Specifically, after the rock sample is placed into the first sealed space of the measuring container, the measuring container is structurally kept airtight. At this time, a second sealed space is formed at the mouth of the measuring container through a sealing ring structure.

[0082] Step S200: Gas with a certain pressure from the reference container is introduced into the first sealed space, and a pressure equilibrium state is reached after a certain period of equilibration.

[0083] Specifically, the control valve on the input pipeline between the reference container and the measuring container is opened, allowing gas at a certain pressure in the reference container to enter the first sealed space of the measuring container. At this time, gas continuously enters the pores of the rock sample, causing the gas pressure in the container to decrease. Under leak-free conditions, the pressure reaches equilibrium after a period of time, and the pressure measured at this point is the equilibrium pressure.

[0084] Step S300: Obtain the first pressure value in the first sealed space under pressure equilibrium state, and continuously obtain the second pressure value of the second sealed space during the equilibrium process and determine its change during the equilibrium process;

[0085] Step S400: Based on the change of the second pressure value, determine whether to output the first pressure value as a calculation parameter for the rock sample volume;

[0086] Step S410: If the second pressure value fluctuates around a certain value and the fluctuation range is within a preset range, then the first pressure value is determined to be output as the calculation parameter for the rock sample volume.

[0087] Step S420: If the second pressure value continues to increase over a period of time, then determine that the first pressure value will not be output as a calculation parameter for the rock sample volume.

[0088] Step S421: Replace the first sealing ring on the cover that forms the second sealed space and is close to the center of the cover, and re-measure the volume of the rock sample.

[0089] Specifically, during the equilibration process, the pressure changes within the second enclosed space are continuously monitored. The pressure in the second enclosed space may exhibit two scenarios:

[0090] The first type is that the pressure in the second sealed space is stable around a certain value, with slight fluctuations. This reflects that the sealing ring structure has good sealing performance and the device is in normal condition. The final equilibrium pressure value can be used for volume calculation.

[0091] The second scenario is that the pressure in the second sealed space is rising and continues to increase over time. This indicates that the sealing structure (the first sealing ring near the center of the measuring container) is not sealing properly, the device is in an abnormal state, and the final equilibrium pressure value cannot be used for volume calculation. The sample test should be terminated, and the first sealing ring of the sealing structure should be inspected and replaced.

[0092] Example 3

[0093] An embodiment of the present invention provides a method for measuring the volume of a rock sample, applied to the aforementioned rock sample volume measuring device, comprising the following steps:

[0094] Step S100: Place rock sample A into the first sealed space of the measuring container, so that the lid of the measuring container covers its container body and forms a second sealed space;

[0095] Step S200: Open the control valve and introduce gas with a certain pressure from the reference container into the first sealed space. The gas continuously enters the pores of rock sample A and reaches a pressure equilibrium state after a certain period of equilibration.

[0096] Step S300: Obtain the first pressure value in the first sealed space under pressure equilibrium state, and continuously obtain the second pressure value of the second sealed space during the equilibrium process and determine its change during the equilibrium process;

[0097] Step S400: Based on the pressure change in the second sealed space, the pressure did not increase significantly, indicating that the sealing ring structure of the measuring container has a good sealing effect and is in normal working condition. The gas balance pressure (first pressure value) of the first sealed space of the measuring container can be used to calculate the volume of rock sample A.

[0098] Example 4

[0099] An embodiment of the present invention provides a method for measuring the volume of a rock sample, applied to the aforementioned rock sample volume measuring device, comprising the following steps:

[0100] Step S100: Place rock sample B into the first sealed space of the measuring container, so that the lid of the measuring container covers its container body and forms a second sealed space.

[0101] Step S200: Open the control valve and introduce gas with a certain pressure from the reference container into the first sealed space. The gas continuously enters the pores of rock sample B and reaches a pressure equilibrium state after a certain period of equilibration.

[0102] Step S300: Obtain the first pressure value in the first sealed space under pressure equilibrium state, and continuously obtain the second pressure value of the second sealed space during the equilibrium process and determine its change during the equilibrium process;

[0103] Step S400: Based on the pressure changes in the second sealed space, the pressure shows a clear and continuous increase, indicating that the sealing effect of the sealing ring structure of the measuring container is poor, the device is malfunctioning, and the gas balance pressure (first pressure value) of the first sealed space of the measuring container cannot be used to calculate the volume of rock sample B. End the sample testing and inspect and replace the first sealing ring on the inner side of the sealing ring structure closest to the center of the measuring container.

[0104] Example 5

[0105] The embodiments of the present invention provide a rock sample volume measurement system, which includes the rock sample volume measurement device described above, and thus possesses all the technical effects it has.

[0106] Furthermore, the rock sample volume measurement system also includes a control device, which is electrically connected to the pressure detection component in the measurement device.

[0107] In the description of this invention, it should be understood that the terms "upper", "lower", "bottom", "top", "front", "rear", "inner", "outer", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0108] While the invention has been described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the invention. Therefore, it should be understood that many modifications can be made to the exemplary embodiments, and other arrangements can be designed without departing from the spirit and scope of the invention as defined by the appended claims. It should be understood that different dependent claims and features described herein can be combined in ways different from those described in the original claims. It is also understood that features described in conjunction with individual embodiments can be used in other described embodiments.

Claims

1. A method for measuring the volume of a rock sample, characterized in that, A rock sample volume measuring device is applied, the rock sample volume measuring device comprising: A measuring container includes a container body and a cover that covers the opening of the container body. The container body has a first sealed space. A first sealing ring and a second sealing ring are concentrically arranged between the end faces of the cover and the opening of the container body to form a second sealed space. A reference container, which is connected to the first enclosed space via an input pipeline; A pressure detection assembly includes a first pressure sensor disposed on the input pipeline and a second pressure sensor disposed in the second sealed space; a reference container is used to introduce gas into the first sealed space; the first pressure sensor and the second pressure sensor in the pressure detection assembly are used to detect the pressure value and pressure change in the first sealed space and the second sealed space, respectively. A first sealing ring and a second sealing ring are provided at the position where the container body and the cover of the measuring container meet. The container body and the cover of the measuring container form a first sealed space, and a second sealed space is formed between the first sealing ring and the second sealing ring. The rock sample is located in the first sealed space. The second sealed space formed by the first sealing ring and the second sealing ring, together with a corresponding pressure sensor, can also actively monitor the sealing performance of the measuring container. A pressurizing assembly includes a pressurizing component connected to the lid, which applies pressure to the lid to press it tightly against the container body. The pressurizing assembly includes a fixed bracket and a pressurizing screw, which engages with a threaded hole on the fixed bracket. Rotating the pressurizing screw causes it to extend further and compress the lid, pressing it firmly against the container body. The first and second sealing rings between the lid and the container body undergo elastic deformation to ensure a tight seal. The method for measuring the volume of rock samples includes the following steps: The rock sample is placed into the first sealed space of the measuring container, and the lid of the measuring container is closed onto its body to form a second sealed space. Gas with a certain pressure from a reference container is introduced into the first sealed space, and a pressure equilibrium state is reached after a certain period of equilibration. Obtain the first pressure value in the first sealed space under the pressure balance state, and continuously obtain the second pressure value of the second sealed space during the balance process and determine its change during the balance process; Based on the change in the second pressure value, determine whether to output the first pressure value as a parameter for calculating the rock sample volume: If the second pressure value fluctuates around a certain value and the fluctuation range is within a preset range, then the first pressure value is determined to be output as the calculation parameter for the rock sample volume. If the second pressure value increases continuously over a period of time, then the first pressure value will not be output as a parameter for calculating the rock sample volume.

2. The method for measuring rock sample volume according to claim 1, characterized in that, A first groove and a second groove are provided on the end face of the container body opening and / or the surface of the cover, and the first sealing ring and the second sealing ring are respectively partially accommodated in the first groove and the second groove.

3. The method for measuring rock sample volume according to claim 1 or 2, characterized in that, A control valve is installed on the input pipeline.

4. The method for measuring rock sample volume according to claim 3, characterized in that, After determining that the first pressure value should not be output as a parameter for calculating the rock sample volume, the method further includes: Replace the first sealing ring on the cover that forms the second sealed space and is close to the center of the cover, and remeasure the volume of the rock sample.

5. A rock sample volume measurement system, characterized in that, It includes the rock sample volume measuring device as described in any one of claims 1 to 4.

6. The rock sample volume measurement system according to claim 5, characterized in that, It also includes a control device that is electrically connected to the pressure detection component in the measuring device.

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