Carbon dioxide buried carbon amount accounting method and device

Abstract

The invention relates to a carbon dioxide buried carbon amount accounting method and device. The method comprises the steps that the state of carbon dioxide in output gas after carbon dioxide oil displacement is determined; the carbon dioxide state comprises a free state, a dissolved state and a mineralized state; the carbon dioxide output in the free state, the dissolved state and the mineralized state is calculated respectively, and the accumulative output is obtained based on the carbon dioxide output in the free state, the dissolved state and the mineralized state; and calculating the carbon dioxide burying amount based on the accumulative output amount and the pre-obtained accumulative injection amount. According to the method, firstly, three different states of a free state, a dissolved state and an ionic state in carbon dioxide are considered, the carbon dioxide output amounts corresponding to the three states are calculated, the carbon dioxide buried carbon amount is calculated, the calculation result is more accurate, and accurate calculation of the carbon dioxide buried carbon amount is achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of gas flow detection, and particularly relates to a method and device for calculating the carbon sequestration amount of carbon dioxide. Background Art

[0002] The calculation of the underground carbon sequestration amount of carbon dioxide after carbon dioxide flooding is a key link in the evaluation of the carbon-negative effect of CCUS-EOR projects and a key parameter for evaluating whether the carbon reduction target can be achieved.

[0003] In related technologies, the existing methods for predicting the sequestration amount mainly consider factors such as geological characteristics, fluid physical properties, temperature and pressure conditions, the degree of enhanced oil recovery by flooding, and the miscible type, and predict the sequestration amount through empirical formulas, theoretical formulas, or reservoir numerical simulations. These prediction methods are mainly used for project pre-evaluation and prediction. For CCUS projects that are being implemented or have been completed, because there are various forms of carbon dioxide, such as free, dissolved, and ionic carbon dioxide, if only traditional fluid detection methods are used, it will lead to an inability to scientifically and accurately calculate the carbon sequestration amount of carbon dioxide. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to overcome the deficiencies of the prior art and provide a method and device for calculating the carbon sequestration amount of carbon dioxide to solve the problem of inaccurate calculation of the carbon sequestration amount of carbon dioxide in the prior art.

[0005] To achieve the above purpose, the present invention adopts the following technical scheme: A method for calculating the carbon sequestration amount of carbon dioxide, comprising:

[0006] Determine the state of carbon dioxide in the produced gas after carbon dioxide flooding; the carbon dioxide state includes free, dissolved, and mineralized states;

[0007] Calculate the carbon dioxide production amounts in the free, dissolved, and mineralized states respectively, and obtain the cumulative production amount based on the carbon dioxide production amounts in the free, dissolved, and mineralized states;

[0008] Calculate the carbon sequestration amount of carbon dioxide based on the cumulative production amount and the pre-obtained cumulative injection amount.

[0009] Further, calculating the carbon dioxide production amount in the free state includes:

[0010] Calculate the change in the produced gas-oil ratio under normal temperature and pressure;

[0011] Calculate the carbon dioxide production amount in the free state according to the change in the gas-oil ratio.

[0012] Further, the following method is used to calculate the carbon dioxide production amount in the free state according to the change in the gas-oil ratio,

[0013]

[0014] Among them, Q Z is the carbon dioxide output in the free state; P ij is the monthly oil production of the i-th production well in the j-th month; R ij is the average production gas-oil ratio of the i-th production well in the j-th month; R o is the average production gas-oil ratio of the reservoir's carbon dioxide injection in the previous year; i is the number of the oil and gas production well; j is the monthly period of the oil and gas production well; m is the time from the start of gas injection to the evaluation period.

[0015] Furthermore, calculating the carbon dioxide output in the dissolved state includes:

[0016] Calculating the dissolved amount of carbon dioxide in the produced fluid underground;

[0017] Calculating the carbon dioxide output in the dissolved state according to the dissolved amount.

[0018] Furthermore, the following method is used to calculate the carbon dioxide output in the dissolved state according to the dissolved amount,

[0019]

[0020] Among them, Q R is the carbon dioxide output in the dissolved state; R ot is the dissolved gas-oil ratio of carbon dioxide in ground crude oil under normal temperature and pressure on the ground; W ij is the monthly water production of the i-th production well in the j-th month; R wt is the dissolved gas-water ratio of carbon dioxide in the produced water under normal temperature and pressure on the ground.

[0021] Furthermore, calculating the carbon dioxide output in the mineralized state includes:

[0022] Calculating the increase in the content of carbonate ions and bicarbonate ions in the produced water on the ground;

[0023] Calculating the carbon dioxide output in the mineralized state according to the increase.

[0024] Furthermore, the following method is used to calculate the carbon dioxide output in the mineralized state according to the increase,

[0025]

[0026] Among them, Q K is the carbon dioxide output in the ionic state; is the average content of carbonate ions in the formation water in the previous year before gas injection or in the initial stage of development; is the content of carbonate ions in the produced water of the i-th production well in the j-th month; is the content of bicarbonate ion in the produced water of the i-th production well and the j-th

[0027] Furthermore, calculating the carbon dioxide burial amount based on the cumulative production amount and the pre-obtained cumulative injection amount includes:

[0028] Constructing a carbon dioxide burial amount accounting model based on the cumulative production amount and the pre-obtained cumulative injection amount;

[0029] Solving the carbon dioxide burial amount accounting model to obtain the carbon dioxide burial amount.

[0030] Furthermore, the carbon dioxide burial amount accounting model is

[0031]

[0032] where Q s is the carbon dioxide burial amount; q g is the cumulative amount of carbon dioxide injected by the g-th gas injection well; g is the injection well number; k is the total number of gas injection wells.

[0033] An embodiment of the present application provides a carbon dioxide carbon burial amount accounting device, including:

[0034] A determination module for determining the carbon dioxide state in the produced gas after carbon dioxide flooding; the carbon dioxide state includes free state, dissolved state, and mineralized state;

[0035] A first calculation module for respectively calculating the carbon dioxide production amounts in the free state, dissolved state, and mineralized state, and obtaining the cumulative production amount based on the carbon dioxide production amounts in the free state, dissolved state, and mineralized state;

[0036] A second calculation module for calculating the carbon dioxide burial amount based on the cumulative production amount and the pre-obtained cumulative injection amount.

[0037] The beneficial effects that can be achieved by the present invention adopting the above technical solutions include:

[0038] The present invention provides a carbon dioxide carbon burial amount accounting method and device. The technical solution provided by the present application considers the carbon dioxide production amounts in three different states, namely free state, dissolved state, and ionic state, in the produced gas after carbon dioxide flooding, so as to obtain the cumulative production amount. Then, using the cumulative injection amount and the cumulative production amount, the cumulative underground burial amount is obtained. The burial amount calculated by the method provided by the present application considers more comprehensive factors and can more accurately and quickly account for the burial amount. In addition, the calculation cost of the accounting method provided by the present application is low, and the calculation method is more scientific. Description of the Drawings

[0039] The accompanying drawings forming a part of this invention are used to provide a further understanding of the invention. The schematic embodiments and descriptions thereof of the invention are used to explain the invention and do not unduly limit the invention. In the drawings:

[0040] Figure 1 It is a schematic diagram of the steps of the carbon sequestration amount accounting method of the present invention;

[0041] Figure 2 It is a schematic structural diagram of the carbon sequestration amount accounting device of the present invention;

[0042] Figure 3 It is a schematic structural diagram of the computer device involved in the carbon sequestration amount accounting method of the present invention. Specific embodiments

[0043] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments. It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0044] The following detailed descriptions are all exemplary descriptions, aiming to provide further detailed descriptions of the present invention. Unless otherwise specified, all technical terms used in the present invention have the same meaning as commonly understood by those of ordinary skill in the art to which the present invention pertains. The terms used in the present invention are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention.

[0045] Currently, for the prediction and calculation of the sequestration amount, mainly based on the sequestration mechanism, considering factors such as geological characteristics, fluid physical properties, temperature and pressure conditions, the amplitude of enhanced oil recovery by carbon dioxide flooding, and the type of miscibility, the sequestration amount is predicted through empirical formulas or reservoir numerical simulations. Among them, the empirical formula method has large errors, and reservoir numerical simulations require a large amount of accurate geological, reservoir, and fluid model data. There are many factors affecting the sequestration amount, and the large workload leads to high cost and low efficiency in carbon sequestration amount accounting.

[0046] The following introduces a specific carbon sequestration amount accounting method and device provided in the embodiments of the present application in conjunction with the accompanying drawings.

[0047] As Figure 1 shown, the carbon sequestration amount accounting method provided in the embodiments of the present application includes:

[0048] S101, determining the carbon dioxide state in the produced gas after carbon dioxide flooding; the carbon dioxide state includes free state, dissolved state, and mineralized state;

[0049] First, the technical solution provided in this application needs to first determine the states of carbon dioxide in the produced gas after carbon dioxide flooding. Generally, it has free state, dissolved state and mineralized state. The output of free carbon dioxide is mainly calculated based on the change in the production gas-oil ratio under normal temperature and pressure; the output of dissolved carbon dioxide is mainly in the produced oil and water, and is mainly calculated based on the dissolved amount of carbon dioxide in the produced fluid underground; the output of mineralized carbon dioxide is based on the reaction process between carbon dioxide flooding and formation water, and the increase in the content of carbonate ions and bicarbonate ions in the produced water on the ground is used to convert the output of carbon dioxide in ionic state.

[0050] S102. Calculate the output of carbon dioxide in the free state, dissolved state and mineralized state respectively, and based on the output of carbon dioxide in the free state, dissolved state and mineralized state, obtain the cumulative output.

[0051] Because the calculation methods of the output of carbon dioxide in each state are different, in this application, the corresponding calculation methods are used to calculate the output of carbon dioxide in the corresponding state respectively, and the sum of the output of carbon dioxide in the three states is the cumulative output.

[0052] S103. Calculate the carbon dioxide storage volume based on the cumulative output and the pre-obtained cumulative injection volume.

[0053] According to the principle of material conservation, the cumulative underground storage volume is equal to the cumulative injection volume minus the cumulative output volume, specifically

[0054] Q s =Q I -Q P (1)

[0055] Wherein, Q s is the cumulative carbon dioxide storage volume, t; Q I is the cumulative injection volume, t; Q P is the cumulative output volume, t.

[0056] Among them, the cumulative injection volume is the sum of the cumulative injection volumes of single wells, specifically

[0057]

[0058] Among them, q g is the cumulative amount of carbon dioxide injected into the gth gas injection well, t; g is the injection well number, and k is the total number of gas injection wells.

[0059] Through the cumulative output calculated in step S102 and the cumulative injection volume obtained by formula (2), the cumulative underground storage volume can be obtained.

[0060] The working principle of the carbon sequestration calculation method for carbon dioxide is as follows: First, determine the state of carbon dioxide existing in the produced gas after carbon dioxide flooding, generally including free state, dissolved state, and mineralized state. Specifically, calculate the carbon dioxide production amounts in these three states respectively, and the sum of the carbon dioxide production amounts in these three states is the cumulative production amount. Calculate the carbon dioxide sequestration amount by the difference between the pre-calculated cumulative injection amount and the cumulative production amount.

[0061] Through the technical solution provided by this application, considering the carbon dioxide production amounts in the free state, dissolved state, and ionic state in the produced carbon dioxide, and then accumulating the carbon dioxide production amounts in these three different states to obtain the cumulative production amount. Calculate the cumulative injection amount by the cumulative carbon dioxide injection amount of the injection well. The calculated carbon dioxide sequestration amount is more comprehensive, and the obtained accounting result is more scientific and accurate. In addition, the calculation method of the technical solution of this application is fast and the cost is lower.

[0062] In some embodiments, calculating the carbon dioxide production amount in the free state includes:

[0063] Calculate the change in the production gas-oil ratio under normal temperature and pressure;

[0064] Calculate the carbon dioxide production amount in the free state according to the change in the gas-oil ratio.

[0065] Specifically, the following method is adopted to calculate the carbon dioxide production amount in the free state according to the change in the gas-oil ratio.

[0066]

[0067] Among them, Q Z is the carbon dioxide production amount in the free state, t; P ij is the monthly oil production of the i-th production well in the j-th month, t; R ij is the average production gas-oil ratio of the i-th production well in the j-th month, m 3 / t; R o is the average production gas-oil ratio of the reservoir in the previous year when injecting carbon dioxide, m 3 / t; i is the number of the oil and gas production well; j is the month of the oil and gas production well; m is the time from the start of gas injection to the evaluation period, month.

[0068] In some embodiments, calculating the carbon dioxide production amount in the dissolved state includes:

[0069] Calculate the dissolved amount of carbon dioxide in the produced fluid underground;

[0070] Calculate the carbon dioxide production amount in the dissolved state according to the dissolved amount.

[0071] Specifically, the following method is adopted to calculate the carbon dioxide production amount in the dissolved state according to the dissolved amount.

[0072]

[0073] Among them, Q R is the carbon dioxide output in the dissolved state, t; R ot is the dissolved gas-oil ratio of carbon dioxide in surface crude oil under normal temperature and pressure on the ground, m 3 / t; W ij is the monthly water production of the i-th production well in the j-th month, t; R wt is the dissolved gas-water ratio of carbon dioxide in the produced water under normal temperature and pressure on the ground, m 3 / t.

[0074] In some embodiments, calculating the carbon dioxide output in the mineralized state includes:

[0075] Calculating the increase in the contents of carbonate ions and bicarbonate ions in the surface produced water;

[0076] Calculating the carbon dioxide output in the mineralized state according to the said increase.

[0077] Specifically, the following method is adopted to calculate the carbon dioxide output in the mineralized state according to the said increase,

[0078]

[0079] Among them, Q K is the carbon dioxide output in the ionic state, t; is the content of carbonate ions in the produced water of the i-th production well in the j-th, kg / m 3 ; is the average content of carbonate ions in the formation water one year before gas injection or at the initial stage of development, kg / m 3 ; is the content of carbonate ions in the produced water of the i-th production well in the j-th, kg / m 3 ; is the content of bicarbonate ions in the produced water of the i-th production well in the j-th, kg / m 3 .

[0080] Among them, the methods for obtaining the dissolved gas-oil ratio and gas-water ratio of carbon dioxide in surface degassed crude oil and formation water under normal temperature and pressure are as follows:

[0081] First, weigh 100 g of formation degassed crude oil, place the formation degassed crude oil in a high-pressure PVT phase analyzer that has been evacuated and heat it to 20 °C, keep the PVT visual cell in a single phase, the pressure is 0.1 MPa, and set it to the constant pressure mode;

[0082] Then, carbon dioxide gas at atmospheric pressure is introduced into the visible kettle containing formation degassed crude oil through a pump at a constant speed of 1 ml / min. When the first bubble appears in the kettle (the crude oil is saturated with dissolved carbon dioxide), record the volume of carbon dioxide introduced into the crude oil as Vo (unit: ml);

[0083] Then calculate the dissolved gas-oil ratio of carbon dioxide in surface degassed crude oil at normal temperature and pressure, with the unit of m 3 / t.

[0084] R ot = 0.01V o (6)

[0085] According to the above steps, replace the formation degassed crude oil with formation produced water, record the volume of carbon dioxide Vw (unit: ml) introduced into the formation water, and calculate the dissolved gas-water ratio of carbon dioxide in the formation water at normal temperature and pressure, with the unit of m 3 / t.

[0086] R wt = 0.01V w (7)

[0087] For the increase in the content of carbonate ions and bicarbonate ions in surface produced water, the specific acquisition method is as follows:

[0088] Collect and collate the average production gas-oil ratio data of the oil well before carbon dioxide injection and the content data of CO3 2- and HCO3 - in the produced water.

[0089] In some embodiments, calculating the carbon dioxide storage amount based on the cumulative production amount and the pre-obtained cumulative injection amount includes:

[0090] Constructing a carbon dioxide storage amount accounting model based on the cumulative production amount and the pre-obtained cumulative injection amount;

[0091] Solving the carbon dioxide storage amount accounting model to obtain the carbon dioxide storage amount.

[0092] The cumulative production amount is the sum of the free state, dissolved state, and ionic state in the following manner, that is, the cumulative production amount,

[0093] Q P = Q Z + Q R + Q K (8)

[0094] The carbon dioxide storage amount accounting model is

[0095]

[0096] Among them, Qs is the carbon dioxide storage volume, t; q g is the cumulative injected carbon dioxide volume of the gth gas injection well, t; g is the injection well number; k is the total number of injection wells.

[0097] As a specific implementation manner, the present application collects and collates the production dynamic data after carbon dioxide flooding, including the cumulative gas injection volumes of different gas injection wells, the monthly oil production volumes, water production volumes, gas-oil ratios and the CO3 2- and HCO3 - content data of different oil wells, and makes them into Table 1 and Table 2 as follows;

[0098] Table 1 Statistical Table of Cumulative Gas Injection Volumes of Gas Injection Wells

[0099]

[0100]

[0101] Table 2 Production Data Sorting Table of the ith Production Well

[0102]

[0103] According to the average gas-oil ratio, dissolved gas-water ratio and the CO3 2- and HCO3 - content data obtained in the above steps, substitute them into the carbon dioxide storage volume accounting model, that is, Equation (9), to obtain the storage volume during the carbon dioxide flooding process and complete the accounting of the carbon dioxide storage volume.

[0104] The present application considers three different states of carbon dioxide in the produced carbon dioxide, namely free state, dissolved state and ionic state, establishes an accounting method, and realizes the scientific and accurate accounting of the carbon dioxide storage volume of the CCUS project. Based on the technical solution provided by the present application, only the production dynamics, the solubility data of carbon dioxide in oil and water at normal temperature and pressure, and the change data of the carbonate (hydrogen) ion content in the surface produced water are required, which is simple and fast.

[0105] As a specific embodiment, carbon dioxide flooding is carried out in an oil reservoir A. The original production gas-oil ratio of the oil reservoir is 60 m 3 / t, among which there are 2 gas injection wells and 2 oil production wells, and the cumulative gas injection is 20 months.

[0106] (1) First, calculate the cumulative injection volume, specifically

[0107] Collect and collate the cumulative injection volumes of 5 wells and make

[0108] Table 3 Statistical Table of Cumulative Gas Injection Volumes of Gas Injection Wells

[0109]

[0110] The cumulative gas injection volume is calculated according to formula (2), and the cumulative injected carbon dioxide volume is obtained as 38000 t.

[0111] (2) Conduct tests on the dissolved gas-oil ratio and gas-water ratio of carbon dioxide in surface degassed crude oil and formation water under normal temperature and pressure conditions;

[0112] First, weigh 100 g of formation degassed crude oil, place the crude oil in a high-pressure PVT phase analyzer that has been evacuated and heat it to 20 °C. Keep the inside of the PVT visual cell in a single phase, with a pressure of 0.1 MPa, and set it to a constant pressure mode; introduce carbon dioxide gas at normal pressure into the visual cell containing the crude oil through a pump at a constant speed of 1 ml / min. When the first bubble appears in the cell (the crude oil is saturated with dissolved carbon dioxide), record the volume of carbon dioxide introduced into the crude oil as 3425 ml, and obtain the solubility of carbon dioxide in surface degassed crude oil under normal temperature and pressure as 34.25 m 3 / t; Test and obtain the solubility of carbon dioxide in formation produced water as 3.75 m 3 / t according to the same method.

[0113] (3) Collect and collate the average production gas-oil ratio data of oil wells and the content data of CO3 2- and HCO3 - in the produced water before carbon dioxide injection in different oil wells;

[0114] Among them, as shown in Tables 4 and 5, the oil well production ratio before gas injection in Well 1# is 65 m 3 / t, and the contents of CO3 2- and HCO3 - in the produced water are 0.90 kg / m 3 , 0.60 kg / m 3 respectively; the oil well production ratio before gas injection in Well 2# is 65 m 3 / t, and the contents of CO3 2- and HCO3 - in the produced water are 1.05 kg / m 3 , 0.75 kg / m 3 respectively.

[0115] (4) Collect and collate the monthly oil production, water production, average production gas-oil ratio data of different oil wells after carbon dioxide injection and the content data of CO3 2- and HCO3 - in the produced water, and draw the following table.

[0116] Table 4 Production dynamic data of Well 1#

[0117]

[0118]

[0119] Table 5 Production performance data of Well 2#

[0120]

[0121]

[0122] (5) Then calculate the carbon dioxide production amounts under different states,

[0123] The free-state carbon dioxide production amount is calculated according to Formula (3), and the cumulative gas production amount of 5160.1 t is obtained.

[0124] The dissolved-state carbon dioxide production amount is calculated according to Formula (4), and the cumulative gas production amount of 829.9 t is obtained.

[0125] The mineralized-state carbon dioxide production amount is calculated according to Formula (5), and the cumulative gas production amount of 3061.0 t is obtained.

[0126] Finally, the obtained results are shown in Table 6.

[0127] Table 6 Gas production amounts of different types of oil wells

[0128] Time (month) Free gas volume (t) Dissolved gas volume (t) Mineralized gas volume (t) Monthly carbon dioxide production (t) 1 1.86 41.01 1.75 44.6 2 14.90 42.64 98.98 156.5 3 37.09 45.59 148.59 231.3 4 89.88 51.20 184.98 326.1 5 148.65 54.85 208.14 411.6 6 229.98 62.43 218.08 510.5 7 297.45 64.17 257.75 619.4 8 378.26 67.64 297.42 743.3 9 489.13 74.58 337.10 900.8 10 489.04 65.33 337.42 891.8 11 430.84 51.16 281.46 763.5 12 356.71 38.27 247.92 642.9 13 343.70 33.47 176.32 553.5 14 348.48 30.99 116.66 496.1 15 305.14 25.03 68.93 399.1 16 266.19 20.23 33.13 319.6 17 251.79 17.92 13.24 283.0 18 250.80 16.76 13.24 280.8 19 228.50 14.45 13.24 256.2 20 201.70 12.14 6.63 220.5 Total 5160.1 829.9 3061.0 9050.9

[0129] (6) Finally, according to the carbon dioxide storage amount accounting model, 38000 t of carbon dioxide is cumulatively injected, the cumulative carbon dioxide production amount is 9050.9 t, the calculated cumulative carbon dioxide storage amount is 28949.1 t, and the carbon dioxide storage rate is 76.2%.

[0130] It is known from common technical knowledge that the present invention can be implemented by other embodiments that do not depart from its spirit or essential features. Therefore, the above-disclosed embodiments are illustrative in all aspects and are not the only ones. All changes within the scope of the present invention or within the scope equivalent to the present invention are encompassed by the present invention.

[0131] As Figure 2 shown, an embodiment of the present application provides a carbon dioxide storage amount accounting device, including:

[0132] A determination module 201, configured to determine the carbon dioxide state in the produced gas after carbon dioxide flooding; the carbon dioxide state includes free state, dissolved state, and mineralized state;

[0133] A first calculation module 202, configured to calculate the carbon dioxide production amounts in the free state, dissolved state, and mineralized state respectively, and obtain a cumulative production amount based on the carbon dioxide production amounts in the free state, dissolved state, and mineralized state;

[0134] A second calculation module 203, configured to calculate the carbon dioxide storage amount based on the cumulative output amount and the pre-acquired cumulative injection amount.

[0135] The working principle of the carbon dioxide storage amount accounting device provided by this application is as follows: The determination module 201 determines the carbon dioxide state in the produced gas after carbon dioxide flooding; the carbon dioxide state includes free state, dissolved state, and mineralized state. Then, the first calculation module calculates the carbon dioxide output amounts in the free state, dissolved state, and mineralized state respectively, and based on the carbon dioxide output amounts in the free state, dissolved state, and mineralized state, obtains the cumulative output amount. Finally, the second calculation module 203 calculates the carbon dioxide storage amount based on the cumulative output amount and the pre-acquired cumulative injection amount.

[0136] This application provides a computer device, including: a memory 1 and a processor 2, and may further include a network interface 3. The memory stores a computer program. The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM), and / or non-volatile memory in the form of, for example, read-only memory (ROM) or flash memory (flash RAM). This computer device stores an operating system 4, and the memory is an example of a computer-readable medium. When the computer program is executed by the processor, the processor executes the carbon dioxide storage amount accounting method. Figure 3 The structure shown is only a block diagram of some structures related to the solution of this application, and does not constitute a limitation on the computer device to which the solution of this application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine some components, or have different component arrangements.

[0137] In one embodiment, the carbon dioxide storage amount accounting method provided by this application can be implemented in the form of a computer program, and the computer program can run on a computer device as shown in Figure 3 the figure.

[0138] In some embodiments, when the computer program is executed by the processor, the processor performs the following steps: determining the carbon dioxide state in the produced gas after carbon dioxide flooding; the carbon dioxide state includes free state, dissolved state, and mineralized state; calculating the carbon dioxide output amounts in the free state, dissolved state, and mineralized state respectively, and based on the carbon dioxide output amounts in the free state, dissolved state, and mineralized state, obtaining the cumulative output amount; calculating the carbon dioxide storage amount based on the cumulative output amount and the pre-acquired cumulative injection amount.

[0139] The present application also provides a computer storage medium. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassette tape storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information accessible by a computing device.

[0140] In some embodiments, the present invention also proposes a computer-readable storage medium storing a computer program. When the computer program is executed by a processor, it determines the carbon dioxide state in the produced gas after carbon dioxide flooding; the carbon dioxide state includes free state, dissolved state, and mineralized state; calculates the carbon dioxide production amounts in the free state, dissolved state, and mineralized state respectively, and obtains the cumulative production amount based on the carbon dioxide production amounts in the free state, dissolved state, and mineralized state; calculates the carbon dioxide buried amount based on the cumulative production amount and the pre-acquired cumulative injection amount.

[0141] In summary, the present invention provides a method and device for calculating the carbon dioxide buried amount. The method includes determining the carbon dioxide state in the produced gas after carbon dioxide flooding; the carbon dioxide state includes free state, dissolved state, and mineralized state; calculating the carbon dioxide production amounts in the free state, dissolved state, and mineralized state respectively, and obtaining the cumulative production amount based on the carbon dioxide production amounts in the free state, dissolved state, and mineralized state; calculating the carbon dioxide buried amount based on the cumulative production amount and the pre-acquired cumulative injection amount. This application considers the carbon dioxide production amounts in three different states, namely free state, dissolved state, and ionic state, in the produced gas after carbon dioxide flooding to obtain the cumulative production amount, and then uses the cumulative injection amount and the cumulative production amount to obtain the cumulative underground buried amount. The buried amount calculated by the method provided in this application takes more comprehensive factors into account, can calculate the buried amount more accurately and quickly. In addition, the calculation cost of the accounting method provided in this application is low and the calculation method is more scientific.

[0142] Those skilled in the art should understand that the embodiments of the present invention can be provided as a method, a system, or a computer program product. Therefore, the present invention can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present invention can 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.

[0143] The present invention is described with reference to the flowcharts and / or block diagrams of methods, apparatuses (systems), and computer program products according to embodiments of the present invention. It should be understood that each flow and / or block in the flowchart and / or block diagram, and the combination of flows and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, such that the instructions executed by the processor of the computer or other programmable data processing devices generate means for implementing the functions specified in one or more flows and / or one or more blocks in the flow Figure 1 one or more flows and / or blocks Figure 1 or means for implementing the functions specified in one or more blocks.

[0144] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, such that the instructions stored in the computer-readable memory generate a manufactured article including instruction means that implement the functions specified in one or more flows and / or one or more blocks in the flow Figure 1 one or more flows and / or blocks Figure 1 or means for implementing the functions specified in one or more blocks.

[0145] These computer program instructions can also be loaded onto a computer or other programmable data processing device, such that a series of operation steps are executed on the computer or other programmable device to generate a computer-implemented process, so that the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in one or more flows and / or one or more blocks in the flow Figure 1 one or more flows and / or blocks Figure 1 or means for implementing the functions specified in one or more blocks.

[0146] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications or equivalent replacements can still be made to the specific embodiments of the present invention, and any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered by the protection scope of the claims of the present invention.

Claims

1. A method for calculating the carbon sequestration amount of carbon dioxide, characterized in that, Including: Determine the carbon dioxide state in the produced gas after carbon dioxide flooding; the carbon dioxide state includes free state, dissolved state and mineralized state; Calculate the carbon dioxide production amounts in the free state, dissolved state and mineralized state respectively, and obtain the cumulative production amount based on the carbon dioxide production amounts in the free state, dissolved state and mineralized state; Calculate the carbon dioxide storage amount based on the cumulative production amount and the pre-obtained cumulative injection amount.

2. The method according to claim 1, wherein Calculating the carbon dioxide production amount in the free state includes: Calculate the change amount of the produced gas-oil ratio at normal temperature and pressure; Calculate the carbon dioxide production amount in the free state according to the change amount of the gas-oil ratio.

3. The method according to claim 2, wherein The carbon dioxide production amount in the free state is calculated according to the change amount of the gas-oil ratio in the following manner, Among them, Q Z is the carbon dioxide output in the free state; P ij is the monthly oil production of the i-th production well in the j-th month; R ij is the average production gas-oil ratio of the i-th production well in the j-th month; R o is the average production gas-oil ratio of the reservoir's carbon dioxide injection in the previous year; i is the number of the oil and gas production well; j is the month of the oil and gas production well; m is the time from the start of gas injection to the evaluation period.

4. The method according to claim 3, wherein Calculating the carbon dioxide production amount in the dissolved state includes: Calculate the dissolved amount of carbon dioxide in the produced fluid underground; Calculate the carbon dioxide production amount in the dissolved state according to the dissolved amount.

5. The method according to claim 4, wherein The carbon dioxide production amount in the dissolved state is calculated according to the dissolved amount in the following manner, Among them, Q R is the carbon dioxide production in the dissolved state; R ot is the dissolved gas-oil ratio of carbon dioxide in surface crude oil under normal temperature and pressure on the ground; W ij is the monthly water production of the i-th production well in the j-th month; R wt is the dissolved gas-water ratio of carbon dioxide in the produced water under normal temperature and pressure on the ground.

6. The method according to claim 5, characterized in that, Calculating the carbon dioxide production amount in the mineralized state includes: Calculate the increase in the contents of carbonate ions and bicarbonate ions in the produced water on the ground; Calculate the carbon dioxide production amount in the mineralized state according to the increase.

7. The method according to claim 6, wherein The carbon dioxide production amount in the mineralized state is calculated according to the increase in the following manner, Among them, Q K is the carbon dioxide output in the ionic state; is the content of carbonate ions in the j-th produced water of the i-th production well, is the average content of carbonate ions in the formation water one year before gas injection or at the initial stage of development; is the content of carbonate ions in the j-th produced water of the i-th production well; is the content of bicarbonate ions in the j-th produced water of the i-th production well.

8. The method according to claim 7, characterized in that, The calculating the carbon dioxide storage amount based on the cumulative production amount and the pre-obtained cumulative injection amount includes: Construct a carbon dioxide storage amount accounting model based on the cumulative production amount and the pre-obtained cumulative injection amount; Solve the carbon dioxide storage amount accounting model to obtain the carbon dioxide storage amount.

9. The method according to claim 8, wherein The carbon dioxide storage amount accounting model is Among them, Q s is the carbon dioxide storage volume; q g is the cumulative carbon dioxide injection volume of the g-th gas injection well; g is the injection well number; k is the total number of gas injection wells.

10. A carbon sequestration amount accounting device for carbon dioxide, characterized in that, Including: A determination module for determining the carbon dioxide state in the produced gas after carbon dioxide flooding; The carbon dioxide state includes free state, dissolved state and mineralized state; A first calculation module for calculating the carbon dioxide production amounts in the free state, dissolved state and mineralized state respectively, and obtaining the cumulative production amount based on the carbon dioxide production amounts in the free state, dissolved state and mineralized state; A second calculation module for calculating the carbon dioxide storage amount based on the cumulative production amount and the pre-obtained cumulative injection amount.

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