Treatment method, device and equipment for representing in-situ decomposition process of natural gas hydrate

Abstract

The invention relates to the technical field of energy, in particular to a processing method and device for representing the in-situ decomposition process of natural gas hydrate and computer equipment. The method comprises the following steps: performing pressure reduction treatment on the natural gas hydrate according to a set amplitude so as to decompose the natural gas hydrate; performing component analysis on the decomposed gas; acquiring first weight data of the decomposed liquid; taking residual solids after decomposition as new natural gas hydrates, and iteratively executing the method steps until iteration ending conditions are met; and analyzing the in-situ decomposition process of the natural gas hydrate according to the component analysis result and the first weight data. According to the embodiment of the invention, the in-situ decomposition process of the natural gas hydrate can be accurately analyzed.

Description

Technical Field

[0001] The present invention relates to the field of energy technology, and in particular to a processing method, device and computer equipment for characterizing the in-situ decomposition process of natural gas hydrate. Background Art

[0002] Natural gas hydrate is a white solid substance with strong combustion power, mainly composed of water molecules and hydrocarbon gas molecules (such as methane). It is a white solid crystalline substance formed by the interaction between gas or volatile liquid and water under certain conditions. When the temperature rises or the pressure decreases, the gas will escape and the solid natural gas hydrate will tend to disintegrate.

[0003] Natural gas hydrates are often distributed in seafloor sediments or cold permafrost at a depth of more than 300 meters. Seafloor natural gas hydrates rely on the pressure of a thick water layer to maintain their solid state. Natural gas hydrates are solid. If pressure-maintained sampling is not implemented, they will decompose after the original low-temperature and high-pressure environment changes. Therefore, it is very important to study the in-situ decomposition process of natural gas hydrates, which is of great significance to the exploration, development and effective utilization of natural gas hydrates. Summary of the invention

[0004] The embodiments of this specification provide a processing method, device and computer equipment for characterizing the in-situ decomposition process of natural gas hydrate, so as to accurately analyze the in-situ decomposition process of natural gas hydrate.

[0005] The present specification provides a method for characterizing the in-situ decomposition process of natural gas hydrates, comprising:

[0006] Depressurizing the natural gas hydrate according to a set range to decompose the natural gas hydrate;

[0007] Conduct component analysis on the decomposed gas;

[0008] Acquiring first weight data of the decomposed liquid;

[0009] The remaining solid after decomposition is used as new natural gas hydrate, and the above method steps are iteratively performed until the iteration end condition is met;

[0010] The in-situ decomposition process of natural gas hydrate is analyzed based on the component analysis results and the first weight data.

[0011] The embodiment of this specification also provides a processing device for characterizing the in-situ decomposition process of natural gas hydrate, comprising:

[0012] The iteration unit is used to depressurize the natural gas hydrate according to a set amplitude to decompose the natural gas hydrate; perform component analysis on the decomposed gas; obtain first weight data of the decomposed liquid; and iteratively execute the above method steps with the remaining solid after decomposition as new natural gas hydrate until the iteration end condition is met;

[0013] The analysis unit is used to analyze the in-situ decomposition process of the natural gas hydrate according to the component analysis result and the first weight data.

[0014] The embodiments of the present specification also provide a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the above-mentioned processing method for characterizing the in-situ decomposition process of natural gas hydrate when executing the computer program.

[0015] The embodiments of the present specification also provide a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the processing method for characterizing the in-situ decomposition process of natural gas hydrate is implemented.

[0016] The embodiments of the present specification also provide a computer program product, which includes a computer program. When the computer program is executed by a processor, the processing method for characterizing the in-situ decomposition process of natural gas hydrate is implemented.

[0017] The processing method for characterizing the in-situ decomposition process of natural gas hydrates in the embodiment of this specification can depressurize natural gas hydrates according to a set amplitude to decompose natural gas hydrates; the decomposed gas can be analyzed for components; the first weight data of the decomposed liquid can be obtained; the remaining solid after decomposition can be used as a new natural gas hydrate, and the above steps can be iteratively performed until the iteration end condition is met; the in-situ decomposition process of natural gas hydrates can be analyzed based on the component analysis results and the first weight data. In this way, by performing multiple continuous depressurization treatments on natural gas hydrates, various occurrence states of natural gas hydrates can be simulated. The decomposition products under different occurrence states can quantitatively characterize the different occurrence states of natural gas hydrates. The decomposition products obtained by multiple depressurization treatments can characterize the in-situ decomposition process of natural gas hydrates. Using the decomposition products of natural gas hydrates under different occurrence states, the in-situ decomposition process of natural gas hydrates can be accurately analyzed. By analyzing and studying the in-situ decomposition process, it is of great significance to the exploration, development and effective utilization of natural gas hydrates. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of this specification or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. The drawings described below are only some embodiments recorded in this specification. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0019] Figure 1 It is a schematic flow chart of a treatment method for characterizing the decomposition process of natural gas hydrate in an embodiment of this specification;

[0020] Figure 2 It is a schematic diagram of the structure of a processing device for characterizing the decomposition process of natural gas hydrate in the embodiments of this specification. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of this specification will be clearly and completely described below in conjunction with the drawings in the embodiments of this specification. Obviously, the described embodiments are only part of the embodiments of this specification, rather than all of the embodiments. The specific embodiments described herein are only used to explain the present disclosure, rather than to limit the present disclosure. Based on the described embodiments of the present disclosure, all other embodiments obtained by those of ordinary skill in the art are within the scope of protection of the present disclosure. In addition, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0022] See also Figure 1 The embodiments of this specification provide a processing method for characterizing the decomposition process of natural gas hydrate.

[0023] The decomposition process may be an in-situ decomposition process of natural gas hydrates. The in-situ may refer to the original location of the natural gas hydrate (e.g., seabed sediments or cold permafrost at a water depth of more than 300 meters). The in-situ environment may be an environment in which natural gas hydrates are naturally formed and stably exist. The in-situ decomposition process of natural gas hydrates may be a decomposition process of natural gas hydrates starting from the in-situ environment and after changing its in-situ environment. It is extremely important to study the in-situ decomposition process of natural gas hydrates, which is of great significance to the exploration, development and effective utilization of natural gas hydrates.

[0024] The method can be applied to computer devices such as terminal devices and servers. The method can include the following steps.

[0025] Step 11: Depressurizing the natural gas hydrate according to a set amplitude to decompose the natural gas hydrate.

[0026] In some embodiments, natural gas hydrate is an ice-like crystalline substance formed by natural gas and water under high pressure and low temperature conditions. Since it can burn when exposed to fire, it is also called combustible ice. Natural gas hydrate is solid. If pressure-maintained sampling is not implemented during the mining process, it will decompose after the original low temperature and high pressure environment is changed. Therefore, studying the various different occurrence states of natural gas hydrate is of great significance to the exploration, development and effective utilization of natural gas hydrate.

[0027] In some embodiments, natural gas hydrates can be obtained as experimental samples. The initial pressure data of natural gas hydrates can be set in advance; under the initial pressure data, the natural gas hydrates are depressurized according to the set amplitude to decompose the natural gas hydrates. The initial pressure data can be, for example, 3.1MPa, 3.9MPa, 5.1MPa, 6.5Mpa, etc. The set amplitude can be, for example, 1Mpa, etc. The set amplitude can be greater than or equal to the first value and less than or equal to the second value. The first value is used to avoid setting the amplitude too small, which results in too many iterations and affects the analysis efficiency. The second value is used to avoid setting the amplitude too large, which makes it impossible to finely simulate the various different occurrence states of natural gas hydrates. During the iterative process, reducing the same pressure amplitude each iteration can improve the accuracy of the analysis of the natural gas hydrate decomposition process.

[0028] After the initial pressure data of the natural gas hydrate is preset, it can also be determined whether the natural gas hydrate has reached an equilibrium state. If the equilibrium state is reached, it means that the natural gas hydrate remains stable under the initial pressure data, so the natural gas hydrate can be depressurized to decompose the natural gas hydrate. If the equilibrium state is not reached, it can be waited until the natural gas hydrate reaches an equilibrium state, and then the natural gas hydrate can be depressurized.

[0029] Of course, the initial pressure data and initial temperature data of the natural gas hydrate can also be pre-set at the same time. Under the initial pressure data and initial temperature data, the natural gas hydrate can be depressurized according to the set amplitude to decompose the natural gas hydrate. The initial temperature data can include, for example, 2°C, 4°C, 6°C, 8°C, etc. The initial pressure data and the initial temperature data can be understood as the initial environmental conditions of the natural gas hydrate. In some examples, after the initial pressure data and the initial temperature data are pre-set, it can also be determined whether the natural gas hydrate has reached an equilibrium state. If the equilibrium state is reached, it means that the natural gas hydrate remains stable under the initial pressure data and the initial temperature data, so that the natural gas hydrate can be depressurized to decompose the natural gas hydrate. If the equilibrium state is not reached, it can be waited until the natural gas hydrate reaches an equilibrium state, and then the natural gas hydrate is depressurized.

[0030] In some embodiments, gas hydrates produce gas when they decompose, which causes a change in pressure. At the same time, gas hydrates absorb heat from the surrounding environment when they decompose, which causes a change in temperature. For this reason, it is possible to determine whether the gas hydrate has reached an equilibrium state by detecting the temperature and / or pressure of the gas hydrate. Specifically, the pressure fluctuation degree of the gas hydrate can be detected; when the pressure fluctuation degree is less than or equal to the first set threshold, it can be determined that the gas hydrate has reached an equilibrium state; otherwise, it can be determined that the gas hydrate has not reached an equilibrium state. Alternatively, the temperature fluctuation degree of the gas hydrate can also be detected; when the temperature fluctuation degree is less than or equal to the second set threshold, it can be determined that the gas hydrate has reached an equilibrium state; otherwise, it can be determined that the gas hydrate has not reached an equilibrium state. Alternatively, the pressure fluctuation degree and temperature fluctuation degree of the gas hydrate can also be detected simultaneously; when the pressure fluctuation degree is less than or equal to the first set threshold, and the temperature fluctuation degree is less than or equal to the second set threshold, it can be determined that the gas hydrate has reached an equilibrium state; otherwise, it can be determined that the gas hydrate has not reached an equilibrium state. Among them, the temperature and / or pressure of the gas hydrate can be detected at every set time interval. Then the pressure fluctuation amplitude can include the difference between the pressures detected twice. The temperature fluctuation amplitude may include the difference between two adjacent detected temperatures. The first set threshold may be, for example, 0, 0.1, 0.5, 1, etc. The second set threshold may be, for example, 0.5, 0.8, 2, etc.

[0031] In some scenario examples, natural gas hydrates can be obtained as experimental samples. Natural gas hydrates can be placed in a reactor. A set gas can be injected into the reactor until the set initial pressure data is reached. The set gas may include nitrogen and the like. By injecting the set gas into the reactor, the air in the reactor can be exhausted, so that the decompression decomposition products of the natural gas hydrates can be accurately obtained, thereby improving the accuracy of the analysis of the decomposition process of the natural gas hydrates. In addition, by injecting the set gas into the reactor, the initial environmental conditions of the natural gas hydrates can also be created. Prevent the generation of new hydrate particles. Repeat the decompression several times to fully decompose the natural gas hydrates. After the natural gas hydrates in the reactor reach a state of equilibrium, the pressure in the reactor can be reduced according to the set amplitude to decompose the natural gas hydrates.

[0032] The above initial environmental conditions (such as initial pressure data and / or initial temperature data) can be determined according to the in-situ environment of the natural gas hydrate. The in-situ environment can be an environment in which the natural gas hydrate is naturally formed and stably exists. By determining the initial environmental conditions according to the in-situ environment, the in-situ decomposition process of the natural gas hydrate can be accurately analyzed.

[0033] Step 12: Analyze the components of the decomposed gas.

[0034] Step 13: Obtain first weight data of the decomposed liquid.

[0035] In some embodiments, depressurizing natural gas hydrates according to a set amplitude will disrupt the equilibrium state of natural gas hydrates, causing the natural gas hydrates to decompose. The decomposition products of natural gas hydrates may include gas and liquid. In this way, the gas decomposed from the natural gas hydrates can be subjected to component analysis to obtain component analysis results. The gas decomposed from the natural gas hydrates may include multiple gas components. The component analysis results include the types of each gas component and the content of each gas component. The first weight data of the liquid decomposed from the natural gas hydrates can also be obtained. The natural gas hydrates may not be fully decomposed and may have residual solids. Thus, the second weight data of the residual solids can also be obtained.

[0036] In some embodiments, it can be determined whether the natural gas hydrate after the depressurization treatment has reached a new equilibrium state. If the new equilibrium state is reached, it means that the natural gas hydrate remains stable, the decomposed gas can be analyzed for components, and the first weight data of the decomposed liquid can be obtained. If the equilibrium state is not reached, it can be waited until the natural gas hydrate reaches a new equilibrium state, and then the decomposed gas can be analyzed for components to obtain the first weight data of the decomposed liquid.

[0037] When natural gas hydrate decomposes, it will produce gas, which will cause the pressure to change. At the same time, when natural gas hydrate decomposes, it will absorb heat from the surrounding environment, which will cause the temperature to change. For this reason, during the decomposition process, it is possible to determine whether the natural gas hydrate has reached a new equilibrium state by detecting the temperature and / or pressure of the natural gas hydrate. Specifically, the pressure fluctuation degree of the natural gas hydrate can be detected; when the pressure fluctuation degree is less than or equal to the first set threshold, it can be determined that the natural gas hydrate has reached a new equilibrium state; otherwise, it can be determined that the natural gas hydrate has not reached a new equilibrium state. Alternatively, the temperature fluctuation degree of the natural gas hydrate can also be detected; when the temperature fluctuation degree is less than or equal to the second set threshold, it can be determined that the natural gas hydrate has reached a new equilibrium state; otherwise, it can be determined that the natural gas hydrate has not reached a new equilibrium state. Alternatively, the pressure fluctuation degree and temperature fluctuation degree of the natural gas hydrate can also be detected at the same time; when the pressure fluctuation degree is less than or equal to the first set threshold, and the temperature fluctuation degree is less than or equal to the second set threshold, it can be determined that the natural gas hydrate has reached a new equilibrium state; otherwise, it can be determined that the natural gas hydrate has not reached a new equilibrium state. Wherein, during the decomposition of natural gas hydrate, the temperature and / or pressure of the natural gas hydrate can be detected at every set time interval. The pressure fluctuation amplitude includes the difference between two adjacent detected pressures. The temperature fluctuation amplitude includes the difference between two adjacent detected temperatures. The first set threshold value may be, for example, 0, 0.1, 0.5, 1, etc. The second set threshold value may be, for example, 0.5, 0.8, 2, etc.

[0038] By detecting the temperature and / or pressure of natural gas hydrate, it can be determined whether the natural gas hydrate has reached a new equilibrium state. In addition, by detecting the temperature and / or pressure of natural gas hydrate, it is also convenient to study the changes in temperature and / or pressure of natural gas hydrate during the decomposition process. In addition, changes in temperature and / or pressure may lead to the formation of natural gas hydrate. By detecting the temperature and / or pressure of natural gas hydrate, it can be determined whether natural gas hydrate is generated. For example, when the temperature increase amplitude is greater than or equal to the third set threshold value and the pressure decrease amplitude is greater than or equal to the fourth set threshold value, it can be determined that natural gas hydrate is generated. The temperature increase amplitude may include the difference between two adjacent temperatures detected. The two adjacent temperatures detected may include the first temperature detected at a later time and the second temperature detected at an earlier time. The temperature increase amplitude may be obtained by subtracting the second temperature from the first temperature. The pressure decrease amplitude may include the difference between two adjacent pressures detected. The two adjacent pressures detected may include the first pressure detected at a later time and the second pressure detected at an earlier time. The pressure decrease amplitude may be obtained by subtracting the second pressure from the first pressure.

[0039] If it is determined that natural gas hydrate is generated, the temperature data and / or pressure data at this time may be recorded.

[0040] The temperature and / or pressure of the natural gas hydrate during the decomposition process can be recorded. For example, the temperature and / or pressure of the natural gas hydrate can be detected and recorded in real time. For another example, the temperature and / or pressure of the natural gas hydrate can be detected and recorded at set time intervals. The decomposition time of the natural gas hydrate can also be recorded. The decomposition time is the time from the pressure reduction treatment of the natural gas hydrate (i.e., the natural gas hydrate begins to decompose) to the natural gas hydrate reaching the equilibrium state (i.e., the natural gas hydrate ends decomposition). In this way, a corresponding relationship between the component analysis result, the first weight data and the decomposition time can be established.

[0041] Step 14: Analyze the decomposition process of the natural gas hydrate according to the component analysis results and the first weight data.

[0042] In some embodiments, the natural gas hydrate may not be fully decomposed after step 11. Therefore, the remaining solid after decomposition may be used as new natural gas hydrate, and the above method steps (such as step 11 to step 13) may be iteratively performed until the iteration end condition is met.

[0043] In the entire iterative process, the pressure after each iteration can be used as the initial pressure of the next iteration, thereby achieving continuous pressure reduction. By performing multiple continuous pressure reduction treatments on natural gas hydrates, various occurrence states of natural gas hydrates can be simulated, and decomposition products under different occurrence states can be obtained.

[0044] The above-mentioned iteration termination condition may include: the degree of difference of the gas components is less than or equal to the third set threshold value. The degree of difference of the gas components can be obtained based on the component analysis results after the current pressure reduction treatment and the component analysis results after the previous pressure reduction treatment. As mentioned above, the component analysis results may include the type of each gas component and the content of each gas component. For each type of gas component, the difference between the content of the gas component after the current pressure reduction treatment and the content of the gas component after the previous pressure reduction treatment can be calculated. The difference can be used to represent the degree of difference of the gas component.

[0045] Of course, the above-mentioned iteration end condition may also include other contents. For example, the iteration end condition may also include: the weight difference degree is less than or equal to the fourth set threshold value. The weight difference degree may be obtained based on the second weight data after the current depressurization process and the second weight data after the last depressurization process. For example, the difference between the second weight data after the current depressurization process and the second weight data after the last depressurization process may be calculated. The difference may be used to represent the weight difference degree.

[0046] In some embodiments, if the iteration end condition is met, it means that the natural gas hydrate has been fully decomposed. Therefore, the decomposition process of the natural gas hydrate can be analyzed according to the component analysis results and the first weight data obtained in each iteration.

[0047] Each depressurization process corresponds to an iterative process, which can simulate an occurrence state of natural gas hydrate. Therefore, the pressure data of each iterative process (the initial pressure of the iterative process minus the set amplitude), the component analysis results and the first weight data can have a corresponding relationship. Therefore, the component analysis results and the first weight data under each pressure data can be used to quantitatively characterize the various occurrence states of natural gas hydrate. Alternatively, a function can be fitted based on the corresponding relationship between the pressure data, the component analysis results and the first weight data. The fitted function is used to quantitatively characterize the decomposition process of natural gas hydrate.

[0048] In some embodiments, if the iteration end condition is met, the decomposition process of the natural gas hydrate can also be analyzed based on the component analysis results, the first weight data, and the second weight data. For example, the component analysis results, the first weight data, and the second weight data under each pressure data can be used to quantitatively characterize the various occurrence states of the natural gas hydrate. Alternatively, a function can be fitted based on the corresponding relationship between the pressure data, the component analysis results, the first weight data, and the second weight data. The fitted function is used to quantitatively characterize the decomposition process of the natural gas hydrate.

[0049] In some embodiments, the natural gas hydrate may be segmented to obtain a plurality of sub-natural gas hydrates. The initial pressure data of the plurality of sub-natural gas hydrates may be preset. The initial pressure data of the plurality of sub-natural gas hydrates may be different. For example, the plurality of sub-natural gas hydrates may include 4 sub-natural gas hydrates, and the initial pressure data of the 4 sub-natural gas hydrates may be 3.1 MPa, 3.9 MPa, 5.1 MPa, and 6.5 MPa, respectively. After the initial pressure data of the plurality of sub-natural gas hydrates are preset, the plurality of sub-natural gas hydrates may be depressurized according to the same set amplitude; the gas decomposed from each sub-natural gas hydrate may be analyzed for components; the first weight data of the liquid decomposed from each sub-natural gas hydrate may be obtained; the remaining solids after the decomposition of the plurality of sub-natural gas hydrates may be used as new plurality of sub-natural gas hydrates, and the above method steps (for example, the steps of depressurizing the plurality of sub-natural gas hydrates, the steps of analyzing the components of the gas decomposed from each sub-natural gas hydrate, and the steps of obtaining the first weight data of each sub-natural gas hydrate) may be iteratively performed. The decomposition process of the natural gas hydrate may be analyzed based on the component analysis results of each sub-natural gas hydrate and the first weight data. Alternatively, the decomposition process of the natural gas hydrate may be analyzed based on the component analysis results of multiple sub-natural gas hydrates and the first weight data.

[0050] The plurality of sub-natural gas hydrates may be subjected to pressure reduction processing according to the same set amplitude. For each sub-natural gas hydrate, during multiple iterations of the sub-natural gas hydrate, the pressure may be reduced according to the same set amplitude.

[0051] The iterative process of each sub-gas hydrate can be referred to step 11 to step 14, which will not be described here. For each sub-gas hydrate, the component analysis results and the first weight data under each pressure data can be used to quantitatively characterize the various occurrence states of the sub-gas hydrate. Alternatively, a function can be fitted based on the corresponding relationship between the pressure data, the component analysis results and the first weight data. The fitted function is used to quantitatively characterize the decomposition process of the sub-gas hydrate.

[0052] The component analysis results and the first weight data of the plurality of sub-natural gas hydrates at the respective pressure data can be used to quantitatively characterize the various occurrence states of the natural gas hydrate. Alternatively, for each sub-natural gas hydrate, a function can be fitted according to the corresponding relationship between the pressure data, the component analysis results and the first weight data; the functions of the plurality of sub-natural gas hydrates can be fused. The fused function is used to quantitatively characterize the decomposition process of the natural gas hydrate.

[0053] Of course, the initial pressure data and initial temperature data of multiple sub-natural gas hydrates can also be pre-set at the same time. The initial pressure data of the multiple sub-natural gas hydrates can be different. The initial temperature data of the multiple sub-natural gas hydrates can be different. For example, the multiple sub-natural gas hydrates can include 4 sub-natural gas hydrates, and the initial pressure data of the 4 sub-natural gas hydrates can be 3.1MPa, 3.9MPa, 5.1MPa, and 6.5MPa, respectively. The initial temperature data of the 4 sub-natural gas hydrates can be 2°C, 4°C, 6°C, and 8°C, respectively. After the initial pressure data and initial temperature data of the plurality of sub-natural gas hydrates are pre-set, the plurality of sub-natural gas hydrates can be depressurized according to the same setting range; the gas decomposed from each sub-natural gas hydrate can be analyzed for components; the first weight data of the liquid decomposed from each sub-natural gas hydrate can be obtained; the remaining solids after the decomposition of the plurality of sub-natural gas hydrates can be used as new plurality of sub-natural gas hydrates, and the above method steps (for example, the steps of depressurizing the plurality of sub-natural gas hydrates, the steps of analyzing the components of the gas decomposed from each sub-natural gas hydrate, and the steps of obtaining the first weight data of each sub-natural gas hydrate) can be iteratively executed. The decomposition process of the natural gas hydrate can be analyzed based on the component analysis results and the first weight data of each sub-natural gas hydrate.

[0054] The processing method for characterizing the decomposition process of natural gas hydrates in the embodiment of this specification can depressurize natural gas hydrates according to a set amplitude to decompose natural gas hydrates; the decomposed gas can be analyzed for components; the first weight data of the decomposed liquid can be obtained; the remaining solid after decomposition can be used as a new natural gas hydrate, and the above steps can be iteratively performed until the iteration end condition is met; the decomposition process of natural gas hydrates can be analyzed based on the component analysis results and the first weight data. In this way, by performing multiple continuous depressurization treatments on natural gas hydrates, various occurrence states of natural gas hydrates can be simulated. The decomposition products under different occurrence states can quantitatively characterize the different occurrence states of natural gas hydrates. The decomposition products obtained by multiple depressurization treatments can characterize the decomposition process of natural gas hydrates. The decomposition process of natural gas hydrates can be accurately analyzed by using the decomposition products of natural gas hydrates under different occurrence states. By analyzing and studying the decomposition process of natural gas hydrates, it is of great significance to the exploration, development and effective utilization of natural gas hydrates.

[0055] An example of an application scenario of the embodiments of this specification is introduced below.

[0056] The initial pressure data and initial temperature data of natural gas hydrate can be set to create the temperature and pressure conditions for the decompression decomposition of natural gas hydrate. The natural gas hydrate can be subjected to a first decompression treatment. The weight W1 of the liquid decomposed by the first decompression treatment can be obtained. The gas decomposed by the first decompression treatment can be subjected to a component analysis to obtain the content G1-i of each component gas. The solid remaining after the first decompression treatment can be subjected to a second decompression treatment. The weight W2 of the liquid decomposed by the second decompression treatment can be obtained. The gas decomposed by the second decompression treatment can be subjected to a component analysis to obtain the content G2-i of each component gas. The solid remaining after the second decompression treatment can be subjected to a third decompression treatment. The weight W3 of the liquid decomposed by the third decompression treatment can be obtained. The gas decomposed by the third decompression treatment can be subjected to a component analysis to obtain the content G3-i of each component gas. The weight S of the remaining solid after the third decompression treatment can be obtained. W1, G1-i, W2, G2-i, W3, G3-i, and S can be used to quantitatively characterize the tertiary decomposition process of natural gas hydrate.

[0057] By using the stepwise depressurization method to depressurize natural gas hydrates and recording the corresponding gas component content and liquid weight, the ambiguity of the gas component content in the traditional depressurization method is avoided and the accuracy of the evaluation of hydrate decomposition products is improved.

[0058] The natural gas hydrate sample can be placed in a high-pressure reactor. N2 is injected into the reactor to exhaust the air in the reactor, thereby creating a high-pressure environment. The pressure in the reactor can reach a phase equilibrium state of 8.5MPa. The temperature can be controlled at 2°C. The temperature and pressure in the reactor can be detected to make them stable, ensuring that hydrate synthesis does not occur in the reactor.

[0059] During the first depressurization process, the temperature in the reactor can be controlled at 2°C. The pressure is reduced to 3.5MPa in the phase equilibrium state. Balance for 2h to ensure that the pressure and temperature in the tank do not change. The first depressurization process is the rapid decomposition stage of natural gas hydrate.

[0060] During the second depressurization process, the temperature in the reactor can be controlled at 2°C. The pressure drop rate is 0.5 MPa·h -1 The depressurization treatment time is 60 minutes. Balance for 2 hours to ensure that the pressure and temperature in the reactor do not change. The second depressurization treatment process is the stage of stable decomposition of natural gas hydrate.

[0061] During the third depressurization process, the temperature in the reactor can be controlled at 2°C. The pressure drop rate is 1 MPa·h -1 . Until the pressure drops to 0 MPa. Balance for 2 hours to ensure that the pressure and temperature in the reactor do not change, so that the hydrate is completely decomposed.

[0062] Another application scenario example of the embodiments of this specification is introduced below.

[0063] S1. Divide the natural gas hydrate into multiple independent samples by mass. Apply different temperature environments to the samples, and control the pressure of the samples to achieve a phase equilibrium state at the temperature. This is to create an environmental condition for decomposition of the samples under reduced pressure. The same decompression gradient (e.g., 1 MPa) can be set to reduce the pressure of all samples by the same amount.

[0064] S2. Reduce the pressure of multiple samples in different phase equilibrium states by the same value, so that the multiple samples are decomposed for the first time (for example, at a decomposition rate of 0.1 MPa / min for 10 min). Monitor the temperature and pressure of each sample during the decomposition process.

[0065] S3, after the first depressurization treatment, component separation is performed. The gas decomposed by the first depressurization treatment is analyzed for components to obtain the gas content G1-i of each component. The weight W1 of the liquid decomposed by the first depressurization treatment can be obtained.

[0066] S4. Perform a second depressurization treatment on the solids remaining after the first depressurization treatment of the plurality of samples, so that the plurality of samples are decomposed for a second time (for example, if the number of samples is 4, the pressure drop rates of the 4 samples can be set to 0.05 MPa / min, 0.45 MPa / min, 0.3 MPa / min, and 0.7 MPa / min, respectively). Monitor the temperature and pressure of each sample during the decomposition process.

[0067] S5. After the second depressurization treatment, separate the components. Perform component analysis on the gas decomposed by the second depressurization treatment to obtain the gas content G2-i of each component. The weight W2 of the liquid decomposed by the second depressurization treatment can be obtained.

[0068] The process of S2-S5 is repeated multiple times until the iteration end condition is met.

[0069] See also Figure 2 The embodiment of this specification also provides a processing device for characterizing the decomposition process of natural gas hydrate. The device can be applied to computer devices such as terminal devices and servers. The device can include the following units.

[0070] The iteration unit 21 is used to depressurize the natural gas hydrate according to a set amplitude to decompose the natural gas hydrate; perform component analysis on the decomposed gas; obtain first weight data of the decomposed liquid; and iteratively perform the above steps with the remaining solid after decomposition as new natural gas hydrate until the iteration end condition is met;

[0071] The analysis unit 22 is used to analyze the decomposition process of the natural gas hydrate according to the component analysis result and the first weight data.

[0072] The embodiments of the present specification also provide a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the above-mentioned processing method for characterizing the decomposition process of natural gas hydrate when executing the computer program.

[0073] The embodiments of the present specification also provide a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the processing method for characterizing the decomposition process of natural gas hydrate is implemented.

[0074] The embodiments of the present specification also provide a computer program product, which includes a computer program. When the computer program is executed by a processor, the processing method for characterizing the decomposition process of natural gas hydrate is implemented.

[0075] Those skilled in the art will appreciate that this specification may be provided as a method, system, or computer program product. Therefore, this specification may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, this specification may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0076] This specification is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products of the embodiments of this specification. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. The computer can be a personal computer, a laptop computer, a cellular phone, a camera phone, a smart phone, a personal digital assistant, a media player, a navigation device, an email device, a game console, a tablet computer, a wearable device, or a combination of any of these devices.

[0077] The various functional units in the embodiments of this specification may be integrated into one processing unit, or each functional unit may exist physically separately, or two or more functional units may be integrated into one processing unit.

[0078] Those skilled in the art will understand that the description of each embodiment in this specification has its own emphasis. For parts not described in detail in a certain embodiment, reference can be made to the relevant description of other embodiments. In addition, it is understood that after reading this specification, those skilled in the art can think of any combination of some or all of the embodiments listed in this specification without creative work, and these combinations are also within the scope of disclosure and protection of this specification.

[0079] Although the present specification is described by way of examples, it is known to those skilled in the art that the above examples are only used to help understand the core idea of ​​the present specification. It is understood by those skilled in the art that there are many variations and changes in the present specification. It is hoped that the appended claims include these variations and changes without departing from the spirit of the present specification.

Claims

1. A method for characterizing the in-situ decomposition process of natural gas hydrate, characterized in that: include: Depressurizing the natural gas hydrate according to a set range to decompose the natural gas hydrate; Conduct component analysis on the decomposed gas; Acquiring first weight data of the decomposed liquid; The remaining solid after decomposition is used as new natural gas hydrate, and the above method steps are iteratively performed until the iteration end condition is met; The in-situ decomposition process of natural gas hydrate is analyzed based on the component analysis results and the first weight data.

2. The method according to claim 1, characterized in that The method further comprises: After placing the natural gas hydrate in the reactor, inject the set gas into the reactor until the set pressure data is reached; The depressurization of the natural gas hydrate according to the set range includes: The pressure in the reactor is reduced by a set amount to decompose the natural gas hydrate.

3. The method according to claim 1, characterized in that: The method further comprises: Determine whether the natural gas hydrate has reached equilibrium after the depressurization treatment; The component analysis of the decomposed gas comprises: After reaching equilibrium, the decomposed gas is analyzed for components; The step of obtaining first weight data of the decomposed liquid includes: After reaching the equilibrium state, the first weight data of the decomposed liquid is obtained.

4. The method according to claim 3, characterized in that The step of judging whether the natural gas hydrate after the pressure reduction treatment has reached an equilibrium state comprises: Detect the pressure fluctuation and temperature fluctuation of natural gas hydrate; When the pressure fluctuation degree is less than or equal to the first set threshold value, and the temperature fluctuation degree is less than or equal to the second set threshold value, it is determined that the natural gas hydrate has reached an equilibrium state; otherwise, it is determined that the natural gas hydrate has not reached an equilibrium state.

5. The method according to claim 1, characterized in that The iteration end conditions include: The difference degree of the gas components is less than or equal to the third set threshold; the difference degree of the gas components is determined based on the component analysis result after the current pressure reduction process and the component analysis result after the previous pressure reduction process.

6. The method according to claim 1, characterized in that The natural gas hydrate includes a plurality of sub-natural gas hydrates having different initial pressure data; and the depressurization of the natural gas hydrate according to the set amplitude includes: According to the same set amplitude, the plurality of daughter natural gas hydrates are subjected to pressure reduction treatment respectively; The component analysis of the decomposed gas comprises: Conduct component analysis on the gas decomposed from each sub-natural gas hydrate; The step of obtaining first weight data of the decomposed liquid includes: respectively obtaining first weight data of liquid decomposed from each sub-natural gas hydrate; The iterative execution of the above method steps comprises: The above method steps are iteratively performed with the remaining solid after the decomposition of the daughter natural gas hydrate being the new daughter natural gas hydrate.

7. The method according to claim 1, characterized in that The method further comprises: Acquire second weight data of the remaining solid in each iteration process; The in-situ decomposition process of analyzing natural gas hydrates comprises: The in-situ decomposition process of the natural gas hydrate is analyzed based on the component analysis results, the first weight data and the second weight data.

8. The method according to claim 1, characterized in that The in-situ decomposition process of analyzing natural gas hydrates comprises: fitting a function according to the corresponding relationship between the pressure data, the component analysis result and the first weight data; The function is used to represent the in-situ decomposition process of natural gas hydrate.

9. A processing device for characterizing the in-situ decomposition process of natural gas hydrate, characterized in that: include: An iteration unit, used for reducing the pressure of the natural gas hydrate according to a set amplitude to decompose the natural gas hydrate; Conduct component analysis on the decomposed gas; Acquire first weight data of the decomposed liquid; take the remaining solid after decomposition as new natural gas hydrate, iteratively execute the above method steps until the iteration end condition is met; The analysis unit is used to analyze the in-situ decomposition process of the natural gas hydrate according to the component analysis result and the first weight data.

10. A computer device, characterized in that: include: at least one processor; A memory storing program instructions, wherein the program instructions are configured to be executed by the at least one processor, and the program instructions include instructions for executing the method according to any one of claims 1-8.

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