Rock resonance frequency determination method, device and system

Abstract

The application discloses a rock resonance frequency determination method, device and system, wherein the method comprises the following steps: placing a rock to be tested in a rock resonance frequency determination system, and performing a quality measurement operation on the rock to be tested; in response to the result of the quality measurement operation being that quality information of the rock to be tested is stable, performing a non-contact acoustic wave generation operation on the rock to be tested to obtain quality information of the rock to be tested under the action of different acoustic wave frequencies; when the obtained quality information of the rock to be tested meets a predetermined condition, determining quality change information corresponding to each acoustic wave frequency according to the quality information of the rock to be tested under the action of different acoustic wave frequencies; and determining a resonance frequency of the rock to be tested according to the quality change information corresponding to each acoustic wave frequency. Through the application, the reutilization rate of the rock can be improved, and the overall sampling cost of the sample can be reduced.

Description

Technical Field

[0001] This invention relates to the field of natural gas development technology, and specifically to a method, apparatus, and system for determining rock resonance frequencies. Background Technology

[0002] Resonance reservoir stimulation technology is a novel unconventional natural gas development technology. Obtaining the resonance frequency of rock samples is a necessary stage for efficient resonance reservoir stimulation. Currently, some methods for measuring the resonance frequency of coal and rock samples have been proposed; however, the vibration source in these methods often directly contacts the rock sample, which can cause irreversible damage, thereby reducing the reuse rate of the rock sample and increasing the overall sampling cost. Summary of the Invention

[0003] The present invention provides a method, apparatus and system for determining the resonant frequency of rocks to solve at least one of the problems mentioned above.

[0004] According to a first aspect of the present invention, a method for determining the resonant frequency of a rock is provided. The method includes: placing a rock to be tested in a rock resonant frequency determination system and performing a mass measurement operation on the rock to be tested; in response to the result of the mass measurement operation indicating that the mass information of the rock to be tested is stable, performing a non-contact sound wave generation operation on the rock to be tested to obtain mass information of the rock to be tested under different sound wave frequencies; when the obtained mass information of the rock to be tested meets predetermined conditions, determining mass change information corresponding to each sound wave frequency based on the mass information of the rock to be tested under different sound wave frequencies; and determining the resonant frequency of the rock to be tested based on the mass change information corresponding to each sound wave frequency.

[0005] Specifically, determining the resonance frequency of the rock to be tested based on the mass change information corresponding to each sound wave frequency includes: determining the largest mass change information based on the mass change information corresponding to each sound wave frequency; and determining the sound wave frequency corresponding to the largest mass change information as the resonance frequency of the rock to be tested.

[0006] Preferably, determining the mass change information corresponding to each sound wave frequency based on the mass information of the rock under test under different sound wave frequencies includes: determining the mass change information corresponding to each sound wave frequency based on the maximum and minimum mass information of the rock under test under each sound wave frequency.

[0007] Furthermore, in response to the result of the quality measurement operation being that the quality information of the rock under test is stable, the method further includes: acquiring stable quality information of the rock under test and saving it as background quality information.

[0008] According to a second aspect of the present invention, a rock resonance frequency determination device is provided, the device comprising: a mass measurement unit for performing a mass measurement operation on a rock to be tested; a sound wave generating unit for performing a non-contact sound wave generating operation on the rock to be tested in response to the result of the mass measurement operation indicating that the mass information of the rock to be tested is stable, to obtain mass information of the rock to be tested under different sound wave frequencies, wherein the sound wave generating unit is not in contact with the rock to be tested; a mass change information determination unit for determining mass change information corresponding to each sound wave frequency based on the mass information of the rock to be tested under different sound wave frequencies when the obtained mass information of the rock to be tested meets predetermined conditions; and a resonance frequency determination unit for determining the resonance frequency of the rock to be tested based on the mass change information corresponding to each sound wave frequency.

[0009] Specifically, the resonance frequency determination unit is used to: determine the largest mass change information based on the mass change information corresponding to each sound wave frequency; and determine the sound wave frequency corresponding to the largest mass change information as the resonance frequency of the rock to be tested.

[0010] Preferably, the mass change information determination unit is specifically used to: determine the mass change information corresponding to each sound wave frequency based on the maximum and minimum mass information of the rock under each sound wave frequency.

[0011] Furthermore, the device also includes a storage unit for acquiring stable quality information of the rock to be tested and saving it as background quality information.

[0012] According to a third aspect of the present invention, a rock resonance frequency determination system is provided, the system comprising: the rock resonance frequency determination device described above, and further comprising: a resonance reaction unit for placing the rock to be tested.

[0013] Preferably, the resonant reaction unit is a cube, the rock to be tested is placed at the bottom of the cube, the top of the cube has a hole corresponding to the size of the rock to be tested, the sound wave generating unit is disposed in the hole, and the sound wave generating unit is not in contact with the cube or the rock to be tested.

[0014] Meanwhile, the present invention also provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the above-described method.

[0015] In addition, the present invention also provides a computer-readable storage medium storing a computer program for performing the above-described method.

[0016] As can be seen from the above technical solution, when the result of the mass measurement operation on the rock to be tested is that its mass information is stable, a non-contact acoustic wave generation operation is performed on the rock to obtain the mass information of the rock under different acoustic wave frequencies. When the obtained mass information of the rock to be tested meets the predetermined conditions, the mass change information corresponding to each acoustic wave frequency is determined based on the mass information of the rock to be tested under different acoustic wave frequencies. Then, the resonant frequency of the rock to be tested is determined based on each mass change information. Through the non-contact acoustic wave generation operation, the resonant frequency of the rock can be measured without causing significant mechanical damage to the rock to be tested, thereby improving the reuse rate of rock samples and reducing the overall sampling cost of rock samples.

[0017] To make the above and other objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a structural block diagram of a rock resonance frequency determination system according to an embodiment of the present invention;

[0020] Figure 2 This is a structural block diagram of the rock resonance frequency determination device 10 according to an embodiment of the present invention;

[0021] Figure 3 This is a system example diagram according to an embodiment of the present invention;

[0022] Figure 4 Based on the embodiments of the present invention Figure 3 Flowchart for determining the rock resonance frequency of the system shown;

[0023] Figure 5 This is a mass-time variation curve at different sound wave frequencies according to an embodiment of the present invention;

[0024] Figure 6 This is a flowchart of a method for determining the resonant frequency of rocks according to an embodiment of the present invention. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Given that current methods for measuring the resonant frequency of coal and rock samples cause irreversible damage to the samples, thus reducing their reuse rate and increasing the overall sampling cost, this invention provides a scheme for determining the resonant frequency of rocks. This scheme employs a non-contact acoustic measurement method, which can measure the resonant frequency of rocks without causing significant mechanical damage, thereby improving the reuse rate and reducing the overall sampling cost.

[0027] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0028] Figure 1 This is a structural block diagram of a rock resonance frequency determination system according to an embodiment of the present invention, such as... Figure 1 As shown, the system includes a rock resonance frequency determination device 10 and a resonance reaction unit 20. The resonance reaction unit 20 is used to place the rock to be tested, and the rock resonance frequency determination device 10 is used to perform a non-contact acoustic wave generation operation on the rock to determine its resonance frequency. The non-contact acoustic wave generation operation ensures that the rock sample does not suffer significant mechanical damage, thereby improving the reuse rate of the rock sample and reducing the overall sampling cost.

[0029] The rock resonance frequency determination device 10 and the resonance reaction unit 20 are described in detail below.

[0030] See Figure 2 As shown, the rock resonance frequency determination device 10 includes: a mass measurement unit 101, a sound wave generation unit 102, a mass change information determination unit 103, and a resonance frequency determination unit 104, wherein:

[0031] The mass measurement unit 101 is used to perform mass measurement operations on the rock to be tested, that is, to measure the mass of the rock.

[0032] The acoustic wave generating unit 102 is used to perform a non-contact acoustic wave generating operation on the rock under test in response to the result of the mass measurement operation being that the mass information of the rock under test is stable, so as to obtain the mass information of the rock under test under different acoustic wave frequencies, wherein the acoustic wave generating unit is not in contact with the rock under test.

[0033] The mass change information determination unit 103 is used to determine the mass change information corresponding to each sound wave frequency based on the mass information of the rock under different sound wave frequencies when the acquired mass information of the rock under test meets the predetermined conditions.

[0034] The predetermined conditions here can be determined according to the actual situation. For example, the quality changes can be stable or the quality changes can exhibit significant periodicity.

[0035] In one embodiment, the mass change information determination unit 103 can determine the mass change information corresponding to each sound wave frequency based on the maximum and minimum mass information of the rock under each sound wave frequency.

[0036] The resonance frequency determination unit 104 is used to determine the resonance frequency of the rock to be tested based on the mass change information corresponding to each sound wave frequency.

[0037] Specifically, the resonance frequency determination unit 104 determines the largest mass change information based on the mass change information corresponding to each sound wave frequency, and then determines the sound wave frequency corresponding to the largest mass change information as the resonance frequency of the rock to be tested.

[0038] When the mass measurement unit 101 performs a mass measurement operation on the rock under test and the result shows that the mass information is stable, the sound wave generation unit 102 performs a non-contact sound wave generation operation on the rock under test to obtain the mass information of the rock under test under different sound wave frequencies. When the obtained mass information of the rock under test meets the predetermined conditions, the mass change information determination unit 103 determines the mass change information corresponding to each sound wave frequency based on the mass information of the rock under test under different sound wave frequencies. Then, the resonance frequency determination unit 104 determines the resonance frequency of the rock under test based on each mass change information. Through the non-contact sound wave generation operation, the resonance frequency of the rock can be measured without causing significant mechanical damage to the rock under test, thereby improving the reuse rate of the rock and reducing the overall sampling cost of the sample.

[0039] In specific implementation, the above-mentioned device may further include: a storage unit, used to acquire stable quality information of the rock to be tested measured by the quality measurement unit 101, and save it as background quality information for later use in the test.

[0040] In practice, the above-mentioned units can be combined or set individually, and the present invention is not limited thereto.

[0041] The aforementioned resonant reaction unit 20 can be a cube, with the rock to be tested placed at the bottom inside the cube. The top of the cube has a hole corresponding to the size of the rock to be tested, and the aforementioned acoustic wave generating unit 102 can be disposed within this hole. The acoustic wave generating unit 102 does not contact the cube or the rock to be tested. This achieves non-contact acoustic wave generation, ensuring that the rock to be tested does not suffer significant mechanical damage, thereby improving the rock's reusability and reducing the overall sampling cost.

[0042] To better understand this invention, the following is combined with... Figure 3 and Figure 4 The embodiments of the present invention will be described in detail below.

[0043] Figure 3 This is a system example diagram according to an embodiment of the present invention. Figure 4 The flowchart for determining the rock resonance frequency based on this system is shown below. Figure 3 , Figure 4 As shown, the process specifically includes the following steps 401-405, which are described below.

[0044] Step 401: Build a non-contact resonant frequency measurement system.

[0045] See Figure 3 First, a non-contact resonant frequency measurement system based on sound waves is constructed. The resonant reaction chamber 1 (corresponding to the resonant reaction unit 20 mentioned above) is assembled. The dimensions of the resonant reaction chamber 1 should preferably be 300mm × 300mm × 300mm, but other dimensions are also possible, depending on the actual situation. The walls of the resonant reaction chamber 1 are filled with reliable sound-absorbing material to ensure that sound waves do not leak out within the chamber. A rock sample 2 (i.e., the rock to be tested) is placed at the bottom of the resonant reaction chamber 1. The rock sample should not exceed 100mm × 100mm × 100mm in size (this size can correspond to the specific dimensions of the resonant reaction chamber 1, depending on the actual situation), and its cross-section should be flat and regular for stable placement. An opening, such as a circular hole or other shaped hole, is made at the center of the top of the resonant reaction chamber 1. If it is a circular hole, its size should not exceed 100mm, and this size can correspond to the size of the rock sample, depending on the actual situation. A sound wave transmitter 3 is suspended inside the circular hole, and the sound wave transmitter 3 does not directly contact the resonant reaction chamber 1. The frequency and amplitude of the sound waves generated by the sound wave generator 3 can be adjusted by the controller 5 via the wire 4. The sound wave generator 3, the wire 4, and the controller 5 here have the functions of the sound wave generating unit described above.

[0046] In practical implementation, the acoustic frequency range adjusted by controller 5 is 0-100kHz, and the acoustic amplitude should not exceed 50dB. Resonance chamber 1 and rock sample 2 can be directly placed on mass measurement platform 6, which is equipped with a high-precision mass measurement device 7 (corresponding to the aforementioned mass measurement unit 101). The device's measurement accuracy is not less than 0.001g, and the measurement frequency is not less than 100kHz. The test data from the high-precision mass measurement device 7 can be stored via data transmission line 8 by data storage device 9 (corresponding to the aforementioned storage unit). The stored data should be consistent with the test data from the high-precision mass measurement device 7, and the storage capacity should be not less than 64GB.

[0047] Step 402: Start the high-precision quality measurement system.

[0048] After setting up the system as required in step 401, place rock sample 2 in the resonance reaction chamber 1, start the high-precision mass measurement system (high-precision mass measurement device 7, data transmission line 8, and data storage device 9), and observe the stability of the measured mass data. If the measurement is basically stable and does not show significant periodic changes, it indicates that the device is in good condition and there is no obvious environmental interference. Record the background mass value under this condition.

[0049] Step 403: Start the sound wave generation system.

[0050] With the high-precision mass measurement device 7 and data storage 9 powered on, the sound wave generation system (sound wave transmitter 3, wire 4, and controller 5) is activated. The controller 5 is used to set the sound wave frequency to 1kHz and the amplitude to 10dB. The mass data acquired by the high-precision mass measurement device 7 and data storage 9 is then observed. Once the mass change stabilizes and exhibits a significant periodic change, the data is stored and recorded.

[0051] Step 404: Obtain the quality and time change curves.

[0052] By successively increasing the sound wave frequency value, step 403 is repeated, and the mass and time corresponding to each sound wave frequency value are recorded. The results are then plotted as follows: Figure 5 The mass-time variation curves are shown, and the amplitude of the mass variation corresponding to each frequency is recorded.

[0053] The formula for calculating the mass change assignment is:

[0054] A Mf =M max f -M min f

[0055] Where: M max f M represents the maximum test quality corresponding to the sound wave frequency f. minf A represents the minimum test quality corresponding to the sound wave frequency f. Mf Let f be the amplitude of the mass change corresponding to the sound wave frequency f.

[0056] Step 405: Combine the key parameters of each frequency to pick out the resonance frequency, that is, determine the resonance frequency of the rock sample.

[0057] Combining the resonance frequency and corresponding mass change amplitude recorded in step 405, the frequency corresponding to the maximum mass change amplitude is the resonance frequency of rock sample 2. For example, see... Figure 5 The mass-time variation curves shown indicate that the mass change amplitude is largest at a frequency of 20 kHz, thus determining the resonance frequency of the rock sample to be 20 kHz.

[0058] The non-contact rock resonance frequency determination process described above allows for the measurement of rock resonance frequencies without causing significant mechanical damage to the rock sample. This improves the reusability of rock samples and reduces the overall sampling cost.

[0059] Based on a similar inventive concept, this embodiment of the invention also provides a method for determining the resonant frequency of a rock. This method can be applied to the above-mentioned rock resonant frequency determination system. When implementing this method, the rock to be tested needs to be placed in the rock resonant frequency determination system.

[0060] Figure 6 This is a flowchart of the method for determining the resonant frequency of this rock, as shown below. Figure 6 As shown, the method includes steps 601-604:

[0061] Step 601: Perform a mass measurement operation on the rock to be tested.

[0062] Step 602: In response to the result of the mass measurement operation being that the mass information of the rock to be tested is stable, a non-contact acoustic wave generation operation is performed on the rock to be tested to obtain the mass information of the rock to be tested under different acoustic wave frequencies.

[0063] In one embodiment, stable quality information of the rock to be tested can be obtained and saved as background quality information for use in subsequent tests.

[0064] Step 603: When the obtained mass information of the rock to be tested meets the predetermined conditions, determine the mass change information corresponding to each sound wave frequency based on the mass information of the rock to be tested under different sound wave frequencies.

[0065] In one embodiment, the mass change information corresponding to each sound wave frequency can be determined based on the maximum and minimum mass information of the rock under each sound wave frequency.

[0066] Step 604: Determine the resonant frequency of the rock to be tested based on the mass change information corresponding to each sound wave frequency.

[0067] Specifically, the largest mass change can be determined based on the mass change information corresponding to each sound wave frequency; the sound wave frequency corresponding to the largest mass change can be determined as the resonance frequency of the rock to be tested.

[0068] In this embodiment of the invention, when the mass measurement operation on the rock to be tested shows that its mass information is stable, a non-contact acoustic wave generation operation is performed on the rock to obtain its mass information under different acoustic wave frequencies. When the obtained mass information of the rock to be tested meets predetermined conditions, the mass change information corresponding to each acoustic wave frequency is determined based on the mass information of the rock to be tested under different acoustic wave frequencies. Then, the resonance frequency of the rock to be tested is determined based on each mass change information. Through the non-contact acoustic wave generation operation, the resonance frequency of the rock can be measured without causing significant mechanical damage to the rock to be tested, thereby improving the reuse rate of the rock and reducing the overall sampling cost of the sample.

[0069] The specific execution process of each of the above steps can be found in the description in the above system and device embodiments, and will not be repeated here.

[0070] This embodiment also provides an electronic device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor. The electronic device can be a desktop computer, tablet computer, or mobile terminal, etc., and this embodiment is not limited thereto. In this embodiment, the electronic device can be implemented with reference to the above-described method embodiments and the embodiments of the rock resonance frequency determination device / system; their contents are incorporated herein, and repeated details will not be described again.

[0071] This invention also provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the steps of the above-described method for determining the rock resonance frequency.

[0072] In summary, the non-contact rock resonance frequency measurement method proposed in this embodiment of the invention, by setting up a non-contact sound wave generator for rock samples, can measure the rock resonance frequency without causing significant mechanical damage to the rock, thereby improving the reuse rate of rock samples and reducing the overall sampling cost of rock samples.

[0073] Specific embodiments have been used to illustrate the principles and implementation methods of this invention. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this invention. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A method for determining the resonant frequency of a rock, characterized in that, The method involves placing the rock to be tested in a rock resonance frequency determination system, and includes: The mass of the rock to be tested was measured. In response to the result of the mass measurement operation being that the mass information of the rock under test is stable, a non-contact acoustic wave generation operation is performed on the rock under test to obtain the mass information of the rock under test under different acoustic wave frequencies. When the acquired mass information of the rock to be tested meets predetermined conditions, the mass change information corresponding to each sound wave frequency is determined based on the mass information of the rock to be tested under different sound wave frequencies, including: Based on the maximum and minimum mass information of the rock under each acoustic frequency, determine the mass change information corresponding to each acoustic frequency; Determining the resonant frequency of the rock under test based on the mass change information corresponding to each sound wave frequency includes: The largest mass change information is determined based on the mass change information corresponding to each sound wave frequency; The acoustic frequency corresponding to the maximum mass change information is determined as the resonant frequency of the rock to be tested.

2. The method as described in claim 1, characterized in that, After the mass measurement operation results in the mass information of the rock under test stabilizing, the method further includes: Obtain stable quality information of the rock to be tested and save it as background quality information.

3. A device for determining the resonant frequency of a rock, characterized in that, The device includes: The mass measurement unit is used to perform mass measurement operations on the rock to be tested. A sound wave generating unit is used to perform a non-contact sound wave generating operation on the rock under test in response to the result of a mass measurement operation that the mass information of the rock under test is stable, so as to obtain the mass information of the rock under test under different sound wave frequencies, wherein the sound wave generating unit does not contact the rock under test. The mass change information determination unit is used to determine the mass change information corresponding to each sound wave frequency based on the mass information of the rock under different sound wave frequencies when the acquired mass information of the rock under test meets the predetermined conditions. The resonance frequency determination unit is used to determine the resonance frequency of the rock to be tested based on the mass change information corresponding to each sound wave frequency. The quality change information determination unit is specifically used for: Based on the maximum and minimum mass information of the rock under each acoustic frequency, determine the mass change information corresponding to each acoustic frequency; The resonance frequency determination unit is specifically used for: The largest mass change information is determined based on the mass change information corresponding to each sound wave frequency; The acoustic frequency corresponding to the maximum mass change information is determined as the resonant frequency of the rock to be tested.

4. The apparatus as described in claim 3, characterized in that, The device further includes: The storage unit is used to acquire stable quality information of the rock to be tested and save it as background quality information.

5. A system for determining the resonant frequency of a rock, characterized in that, The system includes: a rock resonance frequency determination device as described in any one of claims 3 to 4, and the system further includes: A resonant reaction unit is used to place the rock to be tested.

6. The system as described in claim 5, characterized in that, The resonant reaction unit is a cube, and the rock to be tested is placed at the bottom inside the cube. The top of the cube has a hole corresponding to the size of the rock to be tested, and the sound wave generating unit is disposed in the hole. The sound wave generating unit is not in contact with the cube or the rock to be tested.

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