Crude oil structure determination method and device

Abstract

The invention relates to the technical field of crude oil compounding, and discloses a crude oil structure determination method and device, and the method comprises the steps: screening out a target compound oil system from each compound oil system based on a first characteristic parameter of target crude oil and a second characteristic parameter of each compound oil system; according to the content of the acid gas and the content of the amine solvent in the target crude oil, establishing a chemical equilibrium model of the target compound oil system based on the reaction of the amine solvent and the acid gas; and solving the chemical equilibrium model until the target compound oil system reaches the target equilibrium state, and taking the structure corresponding to the target compound oil system in the target equilibrium state as the structure of the target crude oil. According to the scheme, the chemical equilibrium model of the compound oil system is established and solved based on the reaction of the amine solvent and the acid gas, and the target crude oil structure can be accurately simulated, so that the influence of the crude oil structure on crude oil behaviors can be accurately determined.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of crude oil compounding, in particular to a method for determining the structure of crude oil, a device for determining the structure of crude oil, a machine-readable storage medium and a processor. BACKGROUND

[0002] Many changes occur in crude oil at any time, such as foaming, emulsification and other behaviors in crude oil. Crude oil generally contains saturated hydrocarbons, aromatic hydrocarbons, gum and asphaltene components, and also contains H2S, CO2 and other acidic gases and amine solvents. In addition to being affected by external temperature and pressure and other factors, the behavior of crude oil is also affected by the structure of the crude oil (including the proportion of each component in the crude oil, the content of each acidic gas and the content of amine solvents). Therefore, it is crucial to determine the structure of the crude oil for studying the influence of the structure of the crude oil on the behavior of the crude oil.

[0003] At present, the proportion of each component in the crude oil is usually determined by using column chromatography (such as using a silica-alumina chromatographic column) and solvent precipitation method, and then a single component is added to the saturated hydrocarbon white oil in proportion to study the influence of each component in the crude oil on the behavior of the crude oil.

[0004] However, the above scheme often cannot accurately determine the proportion of each component in the crude oil (such as the loss of light hydrocarbon components), and does not consider the acidic gases and amine solvents in the crude oil, resulting in the inability to accurately determine the influence of the structure of the crude oil on the behavior of the crude oil. SUMMARY

[0005] The purpose of the present application is to overcome the problem that the prior art is difficult to accurately determine the influence of each component in the crude oil on the behavior of the crude oil, and to provide a method and device for determining the structure of crude oil, a storage medium and a processor.

[0006] To achieve the above-mentioned purpose, the first aspect of the present application provides a method for determining the structure of crude oil, which comprises: Based on the first characteristic parameters of the target crude oil and the second characteristic parameters of each compounded oil system, a target compounded oil system is selected from each compounded oil system; According to the content of the acidic gas and the content of the amine solvent in the target crude oil, a chemical equilibrium model of the target compounded oil system is established based on the reaction of the amine solvent and the acidic gas. The chemical equilibrium model is solved until the target compounded oil system reaches a target equilibrium state, and the structure corresponding to the target compounded oil system in the target equilibrium state is taken as the structure of the target crude oil.

[0007] In the embodiments of the present application, the target compounded oil system is selected from each compounded oil system based on the first characteristic parameters of the target crude oil and the second characteristic parameters of each compounded oil system, which comprises: Determine the complex oil system closest to the target crude oil in properties from each complex oil system based on the first characteristic parameter of the target crude oil and the second characteristic parameter of each complex oil system, and take the complex oil system as the target complex oil system.

[0008] In the embodiment of the present application, the acid gas includes H2S and CO2, and the amine solvent includes N-methyl diethanolamine.

[0009] In the embodiment of the present application, the reaction of the amine solvent and the acid gas is as follows: Reaction 1: ; Reaction 2: ; In reaction 1 and reaction 2, N-methyl diethanolamine is represented by N.

[0010] In the embodiment of the present application, the chemical equilibrium model of the target complex oil system is established based on the reaction of the amine solvent and the acid gas, including: According to the reaction quotient calculation formula corresponding to the reaction of the amine solvent and the acid gas, the material conservation formula of the target complex oil system and the charge conservation formula of the target complex oil system, the chemical equilibrium model of the target complex oil system is established.

[0011] In the embodiment of the present application, the chemical equilibrium model is solved until the target complex oil system reaches the target equilibrium state, including: Calculate the reaction quotient of reaction 1 and the reaction quotient of reaction 2; Calculate the deviation between the reaction quotient of reaction 1 and the standard value of the reaction equilibrium constant of reaction 1, and calculate the deviation between the reaction quotient of reaction 2 and the standard value of the reaction equilibrium constant of reaction 2; If the deviation between the reaction quotient of reaction 1 and the standard value of the reaction equilibrium constant of reaction 1 is less than the deviation threshold, and the deviation between the reaction quotient of reaction 2 and the standard value of the reaction equilibrium constant of reaction 2 is less than the deviation threshold, it is judged that the target complex oil system reaches the target equilibrium state; if the deviation between the reaction quotient of reaction 1 and the standard value of the reaction equilibrium constant of reaction 1 is not less than the deviation threshold and / or the deviation between the reaction quotient of reaction 2 and the standard value of the reaction equilibrium constant of reaction 2 is not less than the deviation threshold, adjust the concentration of the corresponding reaction, calculate the reaction quotient of the corresponding reaction, and calculate the deviation between the reaction quotient and the standard value of the reaction equilibrium constant, until the deviation between the reaction quotient of reaction 1 and the standard value of the reaction equilibrium constant of reaction 1 is less than the deviation threshold, and the deviation between the reaction quotient of reaction 2 and the standard value of the reaction equilibrium constant of reaction 2 is less than the deviation threshold, then the target complex oil system reaches the target equilibrium state.

[0012] In the embodiment of the present application, the reaction quotient of reaction 1 is calculated based on the following formula: ; wherein, Q 1 is the reaction quotient of reaction 1 ; is the concentration of ; is the concentration of ; is the concentration of ; is the concentration of ; The reaction quotient of reaction 2 is calculated based on the following formula: ; wherein, Q 2 is the reaction quotient of reaction 2 ; is the concentration of ; is the concentration of CO 2.

[0013] The second aspect of the present application provides a crude oil structure determination device, comprising: a screening module configured to screen a target complex oil system from each complex oil system based on a first characteristic parameter of a target crude oil and a second characteristic parameter of each complex oil system; a model establishing module configured to establish a chemical equilibrium model of the target complex oil system based on a reaction between an amine solvent and an acidic gas according to a content of the acidic gas and a content of the amine solvent in the target crude oil; a solving module configured to solve the chemical equilibrium model until the target complex oil system reaches a target equilibrium state, and to take a structure of the target complex oil system corresponding to the target equilibrium state as a structure of the target crude oil.

[0014] The third aspect of the present application provides a processor configured to execute the above-mentioned crude oil structure determination method.

[0015] The fourth aspect of the present application provides a machine readable storage medium having instructions stored thereon, the instructions, when executed by a processor, cause the processor to be configured to execute the above-mentioned crude oil structure determination method.

[0016] By the technical solution, the technical solution comprises: based on the first characteristic parameter of the target crude oil and the second characteristic parameter of each complex oil system, a target complex oil system is selected from each complex oil system; based on the reaction of the amine solvent and the acidic gas, a chemical equilibrium model of the target complex oil system is established according to the content of the acidic gas and the content of the amine solvent in the target crude oil; the chemical equilibrium model is solved until the target complex oil system reaches a target equilibrium state, and the structure of the target complex oil system corresponding to the target equilibrium state is taken as the structure of the target crude oil. Based on the scheme of the present application, by establishing and solving the chemical equilibrium model of the complex oil system based on the reaction of the amine solvent and the acidic gas, the target crude oil structure can be accurately simulated, thereby facilitating accurate determination of the influence of the crude oil structure on the behavior of the crude oil.

[0017] Other features and advantages of the embodiments of the present application will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0018] The accompanying drawings are included to provide a further understanding of the embodiments of the present application, and constitute a part of the specification, and are used to explain the embodiments of the present application together with the following specific embodiments, but do not constitute a limitation of the embodiments of the present application. In the drawings: Figure 1 A flowchart of a crude oil structure determination method according to an embodiment of the present application is schematically shown; Figure 2 A structural block diagram of a crude oil structure determination device according to an embodiment of the present application is schematically shown; Figure 3 An internal structural diagram of a computer device according to an embodiment of the present application is schematically shown.

[0019] Explanation of reference signs 210 - screening module; 220 - model establishing module; 230 - solving module; A01 - processor; A02 - network interface; A03 - internal memory; A04 - display screen; A05 - input device; A06 - non-volatile storage medium; B01 - operating system; B02 - computer program. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme of the embodiments of the present application will be clearly and completely described below in combination with the drawings of the embodiments of the present application. It should be understood that the specific embodiments described herein are only used to illustrate and explain the embodiments of the present application, and are not used to limit the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present application.

[0021] It should be noted that if the embodiments of the present application involve directionality indication (such as up, down, left, right, front, back, etc.), the directionality indication is only used to explain the relative position relationship, motion condition, etc. between components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directionality indication also changes accordingly.

[0022] In addition, if the embodiments of the present application involve descriptions such as "first", "second", etc., the descriptions of "first", "second", etc. are only for description purposes and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of various embodiments can be combined with each other, but it must be based on the fact that a person skilled in the art can realize it, and when the combination of technical solutions contradicts each other or cannot be realized, it should be considered that the combination of technical solutions does not exist and is not within the protection scope claimed by the present application.

[0023] As described in the background, many changes occur in crude oil at any time, such as foaming, emulsification, etc. in crude oil. Crude oil foaming refers to the phenomenon of forming foam due to gas mixing or chemical action during crude oil mining, transportation or processing; crude oil emulsification refers to the phenomenon of forming stable emulsion by mixing crude oil and water under certain conditions. Crude oil generally contains components such as saturated hydrocarbons, aromatic hydrocarbons, resins and asphaltenes, as well as acidic gases such as H2S, CO2 and amine solvents, and the behavior of crude oil is affected by factors such as temperature and pressure outside the crude oil structure (including the proportion of each component in the crude oil, the content of each acidic gas and the content of amine solvents, etc.). Therefore, it is crucial to determine the structure of crude oil for studying the influence of the structure of crude oil on the behavior of crude oil. At present, it is common to first determine the proportion of each component in the crude oil by using column chromatography (such as using a silica-alumina chromatographic column), solvent precipitation method, etc., and then adding a single component to the saturated hydrocarbon white oil according to the proportion to study the influence of each component in the crude oil on the behavior of the crude oil. However, the above scheme often cannot accurately determine the proportion of each component in the crude oil (such as the loss of light hydrocarbon components), and does not consider the acidic gases and amine solvents in the crude oil, resulting in difficulty in accurately determining the influence of the structure of the crude oil on the behavior of the crude oil.

[0024] In view of this, one embodiment of the present application provides a crude oil structure determination method, as shown in Figure 1 The crude oil structure determination method can include the following steps: Step 101, based on the first characteristic parameter of the target crude oil and the second characteristic parameter of each complex oil system, screening a target complex oil system from each complex oil system.

[0025] Each of the compound oil systems is obtained by compounding two or more crude oil samples.

[0026] It can be understood that each of the compound oil systems can be prepared before screening the target compound oil system. Specifically, a plurality of compounding schemes can be designed, one compounding scheme corresponding to one compound oil system, and then the crude oil samples are mixed according to the designed compounding scheme to prepare each of the compound oil systems.

[0027] In the design of the compounding scheme, orthogonal experiment can be used for design, and the specific process can include the following steps one and two: Step one, determine the compounding key influencing factors.

[0028] Specifically, the compounding key influencing factors can include crude oil sample variety combination, crude oil sample compounding ratio, equivalent carbon number matching degree and four-component proportion.

[0029] For the compounding key influencing factor of crude oil sample variety combination, three crude oil samples with obvious differences in properties can be selected, such as high gum crude oil sample, high asphaltene crude oil sample and light crude oil sample, and two or more crude oil samples are selected for combination.

[0030] For the compounding key influencing factor of crude oil sample compounding ratio, the compounding ratio can be designed in gradient form. Taking two crude oil samples as an example, the compounding ratio of the two crude oil samples can be set to 3:7, 4:6, 5:5 according to the mass ratio, or the compounding ratio of the two crude oil samples can be set to 4:6, 5:5, 6:4 according to the volume ratio.

[0031] For the compounding key influencing factor of equivalent carbon number matching degree, it refers to the matching degree of the equivalent carbon number of the compound oil system and the equivalent carbon number of the target crude oil. Specifically, the equivalent carbon numbers of each crude oil sample and the equivalent carbon number of the target crude oil can be determined in advance, and then the equivalent carbon number gradient is set based on the equivalent carbon number of the target crude oil. Taking the equivalent carbon number of the target crude oil = 10 as an example, the gradient can be set to 2, and the compound oil systems with equivalent carbon numbers of 8, 10 and 12 are obtained, so that the surfactant interaction characteristics of the compound oil system and the target crude oil are similar. In actual application, the equivalent carbon number of the compound oil system can be calculated based on the equivalent carbon number of each crude oil sample and the crude oil sample compounding ratio.

[0032] Regarding the key influencing factor in blending—the proportions of the four components, specifically the proportions of saturated hydrocarbons, aromatic hydrocarbons, resins, and asphaltenes—it is crucial to determine the proportions of the four components in each crude oil sample and the target crude oil beforehand. Then, using the proportion of at least one component in the target crude oil (such as the proportion of asphaltenes, which can be determined with relatively high accuracy) as a benchmark, a gradient can be established. For example, by setting a gradient based on the asphaltenes content in the target crude oil, blended oil systems with asphaltenes contents of 5%, 10%, and 15% can be obtained, ensuring that the colloidal structure of the blended oil system closely approximates that of the target crude oil. Adjusting the blending ratio of crude oil samples in conjunction with the proportions of the four components further refines the four-component proportions of the blended oil system, making them even closer to those of the target crude oil.

[0033] Step 2: Design orthogonal experiments based on key influencing factors of compound formulation to obtain various compound formulation schemes.

[0034] In practical implementation, the "4 factors and 3 levels" design can be used to select... An orthogonal array is used, with each experimental combination corresponding to a compounding scheme. For example, experimental combination 1 can be a crude oil sample consisting of high asphaltene crude oil and high aromatic hydrocarbon crude oil, mixed at a mass ratio of 3:7. The equivalent carbon number of the compounded oil system is 8, and the asphaltene content of the compounded oil system is 5%.

[0035] After obtaining the various blending schemes, the crude oil samples can be mixed according to the blending schemes to obtain the various blended oil systems. The mixing conditions can be, for example, stirring at a constant temperature of 60°C, a speed of 500 rpm, and a stirring time of 30 minutes.

[0036] In this embodiment, the first characteristic parameter of the target crude oil may include the equivalent carbon number, emulsification stability, and viscosity of the target crude oil, etc., and the second characteristic parameter of the blended oil system may include the equivalent carbon number, emulsification stability, and viscosity of the blended oil system, etc. The emulsification stability can be obtained using the water separation method.

[0037] In specific implementation, based on the first characteristic parameter of the target crude oil and the second characteristic parameter of each blended oil system, the target blended oil system is selected from each blended oil system. This may include: based on the first characteristic parameter of the target crude oil and the second characteristic parameter of each blended oil system, determining the blended oil system whose properties are closest to the target crude oil from each blended oil system, and taking this blended oil system as the target blended oil system.

[0038] For example, with Taking the nine blending schemes in the orthogonal array as an example, after preparing the blended oil systems corresponding to these nine schemes, the second characteristic parameter of each blended oil system can be measured, while the first characteristic parameter of the target crude oil is also measured. Then, range analysis is used to determine the influence weight of key influencing factors on each characteristic parameter (e.g., the blending ratio of crude oil samples has the greatest impact on the equivalent carbon number, and the combination of crude oil sample types has the greatest impact on emulsification stability). The score of each blended oil system is calculated, and finally, the blended oil system whose properties are closest to the target crude oil is selected. Here, "closest to the target crude oil" can be understood as having the component characteristics and macroscopic behavior most similar to the target crude oil.

[0039] Step 102: Based on the content of acidic gases and amine solvents in the target crude oil, establish a chemical equilibrium model of the target compound oil system based on the reaction between amine solvents and acidic gases.

[0040] The acidic gases specifically include H2S and CO2, which are commonly found in crude oil. The amine solvent can specifically be N-methyldiethanolamine (MDEA), a commonly used desulfurization and decarbonization agent in crude oil processing. In practical applications, the concentrations of H2S and CO2 can be determined by GC-MS, and the concentration of MDEA can be determined by titration.

[0041] The reaction of amine solvents with acidic gases can include: Reaction 1 (reaction of H2S with MDEA): ; Reaction 2 (reaction of CO2 with MDEA): ; In reactions 1 and 2 above, Represents MDEA.

[0042] For reaction 1, the equilibrium constant of the reaction K The formula for calculating 1 is: ; For reaction 2, the equilibrium constant K The formula for calculating 2 is: .

[0043] At the reaction equilibrium constant K 1 and the reaction equilibrium constant K In the calculation formula for 2, [ ] represents the equilibrium concentration of each component in the reaction, in mol / L; the reaction equilibrium constant K 1 and the reaction equilibrium constant K The standard value of 2 can be obtained from literature or determined experimentally, such as the reaction equilibrium constant at 25℃. K The standard value of 1 is approximately 10. 7 Reaction equilibrium constantK The standard value of 2 is approximately 10. -10 .

[0044] This application uses the reaction between amine solvents and acidic gases as a basis to establish a chemical equilibrium model for the target compound oil system, mainly considering the following aspects: Firstly, amine solvents and acidic gases are key chemical factors affecting the macroscopic behavior of crude oil. H2S and CO2 are ubiquitous acidic gases in crude oil, and their dissolved state (molecular or ionic) alters the pH and ionic strength of the crude oil, thereby affecting the dispersion stability and fluidity of asphaltenes and gums in the crude oil. For example, a decrease in pH can lead to asphaltenes aggregation and exacerbate emulsification; an increase in ionic strength will increase the viscosity of the crude oil. Amine solvents (such as MDEA) are commonly used desulfurization and decarbonization agents in crude oil processing. Their reaction with acidic gases can simulate the chemical environment of the target crude oil in actual production, ensuring that the blended oil system closely resembles the on-site operating conditions of the target crude oil. Secondly, this application addresses the deficiency in existing technologies where blended oil systems cannot reflect the chemical stability of the target crude oil. Existing technologies neglect the impact of the reaction between acidic gases and amine solvents on the chemical equilibrium of crude oil during blending, resulting in the blended oil system failing to reflect the chemical stability of the target crude oil. This application, however, is based on the reaction between amine solvents and acidic gases, which can accurately simulate the chemical environment of crude oil during extraction and transportation, enhancing the guidance significance of the research results for on-site production. Thirdly, the reaction is controllable and representative. The reaction of H2S, CO2, and MDEA is a typical reversible proton transfer reaction, with a well-defined standard value for the equilibrium constant (obtainable experimentally or from literature), and the reaction products, such as HS... - and It directly affects the colloidal structure and interfacial properties of crude oil, and can effectively correlate the chemical state and macroscopic behavior of blended oil systems (such as foaming, emulsification, wax precipitation, etc.).

[0045] In the embodiments of this application, the chemical equilibrium model of the target compound oil system is established based on the reaction of amine solvents with acidic gases. This may include: establishing the chemical equilibrium model of the target compound oil system according to the reaction quotient calculation formula corresponding to the reaction of amine solvents with acidic gases, the material conservation formula of the target compound oil system, and the charge conservation formula of the target compound oil system.

[0046] Next, based on the reaction quotient calculation formula corresponding to the reaction of amine solvents with acidic gases, the material conservation formula of the target compound oil system, and the charge conservation formula of the target compound oil system, a chemical equilibrium model of the target compound oil system is established.

[0047] When establishing a chemical equilibrium model for a target blended oil system, the parameters of the chemical equilibrium model can also be initialized, including inputting basic data, setting initial concentrations, and setting convergence thresholds.

[0048] The basic input data includes the concentrations of H2S and CO2, the concentration of MDEA, and the reaction equilibrium constant. K 1 and the reaction equilibrium constant K Standard values ​​of 2 (respectively) For K 1标 and K 2标 Setting the initial concentration includes: setting other ions (such as HS⁻, ...). The initial concentrations of (etc.) can all be set to 0.001 mol / L to avoid calculation singularities. Setting the convergence threshold includes: setting the reaction quotient of reaction 1. Q 1 and K 1标 The deviation threshold between them (e.g., set to 10) -6 ), and setting the reaction quotient for reaction 2. Q 2 and K 2标 The deviation threshold between them (e.g., set to 10) -6 ).

[0049] It is understandable that when the calculated reaction quotient Q 1 and K 1标 The deviation between them is less than the set deviation threshold (e.g., <10). -6 ), and the calculated reaction quotient Q 2 and K 2标 The deviation between them is less than the set deviation threshold (e.g., <10). -6 When the target compound oil system reaches a stable chemical equilibrium state, it can be determined that the system has reached a stable chemical equilibrium state.

[0050] Step 103: Solve the chemical equilibrium model until the target blended oil system reaches the target equilibrium state, and take the structure of the target blended oil system under the target equilibrium state as the structure of the target crude oil.

[0051] The target equilibrium state can be understood as a stable chemical equilibrium state.

[0052] In this embodiment of the application, solving the chemical equilibrium model until the target blended oil system reaches the target equilibrium state may include the following steps I, II, and III: Step I: Calculate the reaction quotients of reaction 1 and reaction quotients of reaction 2.

[0053] Among them, the reaction quotient of reaction 1 Q The formula for calculating 1 can be: ; The reaction quotient of reaction 2 Q The formula for calculating 2 can be: .

[0054] In the above reaction quotient Q 1 and reaction quotient Q In the formula for calculating 2, for The concentration; for The concentration; for The concentration; for The concentration; for The concentration; for CO The concentration of 2.

[0055] The reaction quotient reflects the current reaction trend of the system. When the reaction quotient is greater than the standard value of the reaction equilibrium constant, the reaction proceeds in the reverse direction. When the reaction quotient is less than the standard value of the reaction equilibrium constant, the reaction proceeds in the forward direction.

[0056] Step II: Calculate the deviation between the reaction quotient of reaction 1 and the standard value of the reaction equilibrium constant of reaction 1, and calculate the deviation between the reaction quotient of reaction 2 and the standard value of the reaction equilibrium constant of reaction 2.

[0057] Specifically, the deviation can be an absolute value deviation.

[0058] Step III, if the reaction quotient of reaction 1 is equal to the standard value of the reaction equilibrium constant of reaction 1 ( K 1标 The deviation between the two is less than the deviation threshold, and the reaction quotient of reaction 2 is less than the standard value of the reaction equilibrium constant of reaction 2. K 2标 If the deviation between the reaction quotient of reaction 1 and the standard value of the reaction equilibrium constant of reaction 1 is less than the deviation threshold, then the target compound oil system is judged to have reached the target equilibrium state. If the deviation between the reaction quotient of reaction 1 and the standard value of the reaction equilibrium constant of reaction 1 is not less than the deviation threshold and / or the deviation between the reaction quotient of reaction 2 and the standard value of the reaction equilibrium constant of reaction 2 is not less than the deviation threshold, then the component concentration of the corresponding reaction is adjusted, and the reaction quotient of the corresponding reaction is calculated, as well as the deviation between the reaction quotient of the corresponding reaction and the standard value of the reaction equilibrium constant of reaction 1, until the deviation between the reaction quotient of reaction 1 and the standard value of the reaction equilibrium constant of reaction 1 is less than the deviation threshold, and the deviation between the reaction quotient of reaction 2 and the standard value of the reaction equilibrium constant of reaction 2 is less than the deviation threshold, then the target compound oil system has reached the target equilibrium state.

[0059] Specifically, if the deviation between the reaction quotient of reaction 1 and the standard value of the reaction equilibrium constant of reaction 1 is not less than a deviation threshold and / or the deviation between the reaction quotient of reaction 2 and the standard value of the reaction equilibrium constant of reaction 2 is not less than a deviation threshold, then the concentration of the corresponding reaction components is adjusted, and the reaction quotient of the corresponding reaction is calculated, as well as the deviation between the reaction quotient of the corresponding reaction and the standard value of the reaction equilibrium constant, until the deviation between the reaction quotient of reaction 1 and the standard value of the reaction equilibrium constant of reaction 1 is less than the deviation threshold, and the deviation between the reaction quotient of reaction 2 and the standard value of the reaction equilibrium constant of reaction 2 is less than the deviation threshold, then the target compound oil system reaches the target equilibrium state, which may include: If the deviation between the reaction quotient of reaction 1 and the standard value of the reaction equilibrium constant of reaction 1 is not less than the deviation threshold, then the component concentration of reaction 1 is adjusted, and the reaction quotient of reaction 1 is calculated, as well as the deviation between the reaction quotient of reaction 1 and the standard value of the reaction equilibrium constant of reaction 1, until the deviation between the reaction quotient of reaction 1 and the standard value of the reaction equilibrium constant of reaction 1 is less than the deviation threshold, and the deviation between the reaction quotient of reaction 2 and the standard value of the reaction equilibrium constant of reaction 2 is less than the deviation threshold, then the target compound oil system reaches the target equilibrium state.

[0060] If the deviation between the reaction quotient of reaction 2 and the standard value of the reaction equilibrium constant of reaction 2 is not less than the deviation threshold, then the component concentration of reaction 2 is adjusted, and the reaction quotient of reaction 2 is calculated, as well as the deviation between the reaction quotient of reaction 2 and the standard value of the reaction equilibrium constant of reaction 2, until the deviation between the reaction quotient of reaction 1 and the standard value of the reaction equilibrium constant of reaction 1 is less than the deviation threshold, and the deviation between the reaction quotient of reaction 2 and the standard value of the reaction equilibrium constant of reaction 2 is less than the deviation threshold, then the target compound oil system reaches the target equilibrium state. If the deviation between the reaction quotient of reaction 1 and the standard value of the reaction equilibrium constant of reaction 1 is not less than the deviation threshold, and the deviation between the reaction quotient of reaction 2 and the standard value of the reaction equilibrium constant of reaction 2 is not less than the deviation threshold, then the component concentrations of reaction 1 and reaction 2 are adjusted, and the reaction quotients of reaction 1 and reaction 2 are calculated, as well as the deviation between the reaction quotient of reaction 1 and the standard value of the reaction equilibrium constant of reaction 1, and the deviation between the reaction quotient of reaction 2 and the standard value of the reaction equilibrium constant of reaction 2, until the deviation between the reaction quotient of reaction 1 and the standard value of the reaction equilibrium constant of reaction 1 is less than the deviation threshold, and the deviation between the reaction quotient of reaction 2 and the standard value of the reaction equilibrium constant of reaction 2 is less than the deviation threshold, then the target compound oil system reaches the target equilibrium state.

[0061] In practical applications, if the deviation between the reaction quotient of reaction 1 and the standard value of the reaction equilibrium constant of reaction 1 is not less than the deviation threshold, i.e. | Q 1- K 1标 |≥10-6 ,against Q 1> K 1标 The situation is as follows: Reversing reaction 1 can reduce the concentration of the product in the components of reaction 1. , ), and increase the concentration of reactants in the components of reaction 1 ( , The specific adjustment range can be determined by following the formula "( Q 1- K 1标 ) / K 1标 The proportion calculation (e.g., if calculated as 5%, then the product concentration decreases by 5%, and the reactant concentration increases by 5%) is for... Q 1 < K 1标 Situation: Reaction 1 proceeds in the forward direction, which can reduce the concentration of reactants in the components of reaction 1. , ), and increase the concentration of the product in the components of reaction 1 ( , The adjustment method is similar.

[0062] Similarly, for Q 2 and K 2标 The deviation is adjusted according to the same logic for [CO2]. , , The concentration. When | Q 1- K 1标 |<10 -6 And| Q 2 -K 2标 |<10 -6 When the iteration stops, the current equilibrium concentration of each component is output, which is the stable chemical equilibrium state of the compound oil system.

[0063] During the above adjustments, both material conservation and charge conservation must be satisfied. Regarding satisfying material conservation: for example, adjusting [HS...] - Simultaneously adjust [H2S] to maintain a constant total S concentration. Regarding satisfying charge conservation: substitute the equilibrium concentrations of each component obtained through iteration into the charge conservation formula to verify the deviation between the total cation concentration and the total anion concentration; generally, it should be <10. -8 mol / L; if the deviation does not meet the requirements, re-initialize the parameters and iterate again.

[0064] It is understood that the crude oil structure determination method provided in this application includes: selecting a target blended oil system from various blended oil systems based on a first characteristic parameter of the target crude oil and a second characteristic parameter of each blended oil system; establishing a chemical equilibrium model of the target blended oil system based on the reaction of amine solvents with acidic gases according to the content of acidic gases and amine solvents in the target crude oil; solving the chemical equilibrium model until the target blended oil system reaches a target equilibrium state, and taking the structure corresponding to the target blended oil system at the target equilibrium state as the structure of the target crude oil. Based on the scheme of this application, by establishing and solving a chemical equilibrium model of the blended oil system based on the reaction of amine solvents with acidic gases, the structure of the target crude oil can be accurately simulated, thereby facilitating the accurate determination of the influence of crude oil structure on crude oil behavior.

[0065] In practical applications, after obtaining the structure of the target blended oil system under the target equilibrium state, performance testing and verification can be performed. For example, the emulsion particle size distribution of the target blended oil system can be determined by dynamic light scattering (DLS) to evaluate emulsion stability and compare it with the emulsion stability of the target crude oil; a rotational viscometer can be used to test the viscosity change of the target blended oil system at different temperatures (25-80℃) to simulate the flow behavior of the target crude oil under mining conditions and compare it with the viscosity change of the target crude oil.

[0066] If the behavioral data (emulsion stability, viscosity change, etc.) of the target blended oil system do not match the behavioral data (emulsion stability, viscosity change, etc.) of the target crude oil, such as a large deviation, the cause of the deviation should be identified first, and then targeted adjustments should be made. Specifically, matching can be achieved through a closed-loop process of "parameter fine-tuning - retesting - deviation verification" based on the correlation between the behavioral data and the parameters of the blended oil system (blending ratio, chemical equilibrium state, test conditions). The adjustment strategies differ for different behavioral data, as detailed below: (1) Deviation Location. By comparing the behavioral data of the target blended oil system and the target crude oil, the source of deviation is determined: Type 1: Deviation in compound ratio, such as mismatch in equivalent carbon number, mismatch in the proportion of the four components, etc. Type 2: Chemical equilibrium deviation, such as the reaction of amine solvents with acidic gases not reaching a stable state, or the influence of ion concentration on colloidal structure; Type 3: Deviation in test conditions, such as temperature and pressure, which do not match the actual working conditions.

[0067] (2) Parameter adjustment. For each type of deviation, select the corresponding adjustment parameter and make fine adjustments in increments of 5%-10% to avoid large adjustments that could lead to system instability. (3) Verify the closed loop. Perform performance testing and verification again. If the deviation is still large, repeat the above steps until the deviation is small.

[0068] Furthermore, since the equivalent carbon number characterizes the interaction strength between crude oil and surfactants, a higher equivalent carbon number indicates a stronger affinity between the crude oil and surfactants, resulting in a more stable emulsion and a lower minimum miscibility pressure (MMP, the lowest pressure required for crude oil and injected gas to achieve a miscible state). Therefore, based on this, the relationship between the equivalent carbon number and MMP of a blended oil system can be experimentally quantified. The specific process is as follows: 1. Prepare multiple blended oil systems. Specifically, based on orthogonal experimental design, prepare six blended oil systems with equivalent carbon numbers covering 8-12 (the common range of the target crude oil). The equivalent carbon number difference of each blended oil system is 0.8-1.0. For example, the equivalent carbon numbers of the six blended oil systems are 8.0, 9.0, 10.0, 11.0, and 12.0, respectively, to ensure uniform distribution of data points. 2. Determination of key parameters. (1) Determination of MMP: Using the capillary tube test method, each compound oil system and injection gas (such as CO2) are introduced into the capillary tube, the pressure is gradually increased, and the pressure when each compound oil system and gas reach the miscibility is recorded, which is the MMP corresponding to the equivalent carbon number. (2) Determination of emulsion stability: The emulsion half-life (the time required for the emulsion to separate into 50% layers) of each compound oil system is determined by the water separation rate method, and the average particle size of the emulsion is determined by the dynamic light scattering instrument. Both are used as stability evaluation indicators.

[0069] 3. Data fitting and formula establishment. (1) Fitting the quantitative relationship between equivalent carbon number and MMP: The equivalent carbon number (as independent variable) of the 6 compound oil systems and the corresponding MMP (as dependent variable) were fitted by linear regression to obtain the equation, which is the quantitative relationship between equivalent carbon number and MMP. (2) Fitting the quantitative relationship between equivalent carbon number and emulsion stability: The emulsion half-life was used as the dependent variable and the equivalent carbon number was used as the independent variable. Linear regression was fitted to obtain the equation, which is the quantitative relationship between equivalent carbon number and emulsion stability.

[0070] 4. Model Validation and Application. (1) Validation: Select the intermediate equivalent carbon number (e.g., 9.5) of the compound oil system that did not participate in the fitting, substitute it into the quantitative relationship between equivalent carbon number and MMP to predict MMP, and compare it with the MMP actually measured in the compound oil system to verify the accuracy of the quantitative relationship. The verification of the quantitative relationship between equivalent carbon number and emulsion stability is the same. (2) In application, only the equivalent carbon number of the compound oil system needs to be measured, and MMP and emulsion stability can be directly predicted by the formula without repeating complex field experiments, which greatly improves the research efficiency.

[0071] Based on the same inventive concept, such as Figure 2 As shown, Figure 2This schematically illustrates a structural block diagram of a crude oil structure determination device according to an embodiment of the present application. In one embodiment, a crude oil structure determination device 200 is provided, including a screening module 210, a model building module 220, and a solution module 230, wherein: The screening module 210 is used to screen out the target blended oil system from each blended oil system based on the first characteristic parameter of the target crude oil and the second characteristic parameter of each blended oil system. The model building module 220 is used to establish a chemical equilibrium model of the target compound oil system based on the content of acidic gases and amine solvents in the target crude oil and the reaction between amine solvents and acidic gases. The solver module 230 is used to solve the chemical equilibrium model until the target blended oil system reaches the target equilibrium state, and the structure of the target blended oil system at the target equilibrium state is taken as the structure of the target crude oil.

[0072] In one embodiment, the filtering module 210 is used for: Based on the first characteristic parameter of the target crude oil and the second characteristic parameter of each blended oil system, the blended oil system whose properties are closest to the target crude oil is determined from each blended oil system, and this blended oil system is taken as the target blended oil system.

[0073] In one embodiment, the acidic gas includes H2S and CO2, and the amine solvent includes N-methyldiethanolamine.

[0074] In one embodiment, the reaction between the amine solvent and the acidic gas is as follows: Reaction 1: ; Reaction 2: ; In reactions 1 and 2, It represents N-methyldiethanolamine.

[0075] In one embodiment, the model building module 220 is used for: Based on the reaction quotient calculation formula corresponding to the reaction of amine solvents with acidic gases, the material conservation formula and the charge conservation formula of the target compound oil system, a chemical equilibrium model of the target compound oil system is established.

[0076] In one embodiment, the solver module 230 is used for: Calculate the reaction quotients of reaction 1 and reaction quotients of reaction 2; Calculate the deviation between the reaction quotient of reaction 1 and the standard value of the reaction equilibrium constant of reaction 1, and calculate the deviation between the reaction quotient of reaction 2 and the standard value of the reaction equilibrium constant of reaction 2; If the deviation between the reaction quotient of reaction 1 and the standard value of the reaction equilibrium constant of reaction 1 is less than the deviation threshold, and the deviation between the reaction quotient of reaction 2 and the standard value of the reaction equilibrium constant of reaction 2 is less than the deviation threshold, then the target compound oil system is judged to have reached the target equilibrium state. If the deviation between the reaction quotient of reaction 1 and the standard value of the reaction equilibrium constant of reaction 1 is not less than the deviation threshold and / or the deviation between the reaction quotient of reaction 2 and the standard value of the reaction equilibrium constant of reaction 2 is not less than the deviation threshold, then the component concentrations of the corresponding reactions are adjusted, and the reaction quotients of the corresponding reactions are calculated, as well as the deviations between the reaction quotients of the corresponding reactions and the standard values ​​of the reaction equilibrium constants are calculated, until the deviation between the reaction quotient of reaction 1 and the standard value of the reaction equilibrium constant of reaction 1 is less than the deviation threshold, and the deviation between the reaction quotient of reaction 2 and the standard value of the reaction equilibrium constant of reaction 2 is less than the deviation threshold, then the target compound oil system has reached the target equilibrium state.

[0077] In one embodiment, the solver module 230 is used for: Calculate the reaction quotient of reaction 1 using the following formula: ; in, Q 1 is the reaction quotient of reaction 1; for The concentration; for The concentration; for The concentration; for The concentration; Calculate the reaction quotient of reaction 2 based on the following formula: ; in, Q 2 is the reaction quotient of reaction 2; for The concentration; for CO The concentration of 2.

[0078] The crude oil structure determination device includes a processor and a memory. The screening module 210, model building module 220 and solution module 230 are all stored as program units in the memory. The processor executes the program modules stored in the memory to realize the corresponding functions.

[0079] A processor contains a core, which retrieves the corresponding program unit from memory. One or more cores can be configured, and by adjusting the core parameters, fast and efficient computation can be achieved at the entire chip scale.

[0080] The memory may include non-permanent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM, and the memory includes at least one memory chip.

[0081] This application provides a machine-readable storage medium storing a program that, when executed by a processor, implements the above-described method for determining crude oil structure.

[0082] In one embodiment, a computer device is provided, which may be a terminal, and its internal structure diagram may be as follows: Figure 3 As shown in the figure, the computer device includes a processor A01, a network interface A02, a display screen A04, an input device A05, and a memory (not shown) connected via a system bus. The processor A01 provides computing and control capabilities. The memory includes internal memory A03 and a non-volatile storage medium A06. The non-volatile storage medium A06 stores an operating system B01 and a computer program B02. The internal memory A03 provides an environment for the operation of the operating system B01 and the computer program B02 stored in the non-volatile storage medium A06. The network interface A02 is used for communication with external terminals via a network connection. When the computer program is executed by the processor A01, it implements a crude oil structure determination method. The display screen A04 can be a liquid crystal display (LCD) or an e-ink display. The input device A05 can be a touch layer covering the display screen, buttons, a trackball, or a touchpad mounted on the computer device casing, or an external keyboard, touchpad, or mouse.

[0083] Those skilled in the art will understand that Figure 3 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the computer device to which the present application is applied. Specific computer devices may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0084] In one embodiment, the crude oil structure determination device provided in this application can be implemented as a computer program, and the computer program can be implemented as follows: Figure 3 The computer device shown runs on this system. The computer device's memory can store the various program modules that make up the intelligent scheduling device for this construction task, for example... Figure 2 The shown modules are screening module 210, model building module 220, and solution module 230. The computer program comprised of these modules causes the processor to execute the steps in the crude oil structure determination methods of the various embodiments of this application described in this specification.

[0085] Figure 3 The computer device shown can be used as follows Figure 2 The execution method of the screening module 210, model building module 220 and solution module 230 in the crude oil structure determination device shown.

[0086] This application provides a device, which includes a processor, a memory, and a program stored in the memory and executable on the processor. When the processor executes the program, it performs the following steps: Based on the first characteristic parameter of the target crude oil and the second characteristic parameter of each blended oil system, the target blended oil system is selected from each blended oil system; Based on the content of acidic gases and amine solvents in the target crude oil, a chemical equilibrium model of the target blended oil system is established based on the reaction between amine solvents and acidic gases. The chemical equilibrium model is solved until the target blended oil system reaches the target equilibrium state. The structure of the target blended oil system at the target equilibrium state is taken as the structure of the target crude oil.

[0087] In one embodiment, the step of selecting the target blended oil system from the various blended oil systems based on the first characteristic parameter of the target crude oil and the second characteristic parameter of each blended oil system includes: Based on the first characteristic parameter of the target crude oil and the second characteristic parameter of each blended oil system, the blended oil system whose properties are closest to the target crude oil is determined from each blended oil system, and this blended oil system is taken as the target blended oil system.

[0088] In one embodiment, the acidic gas includes H2S and CO2, and the amine solvent includes N-methyldiethanolamine.

[0089] In one embodiment, the reaction between the amine solvent and the acidic gas is as follows: Reaction 1: ; Reaction 2: ; In reactions 1 and 2, N-methyldiethanolamine

[0090] In one embodiment, establishing a chemical equilibrium model for the target compound oil system based on the reaction of amine solvents with acidic gases includes: Based on the reaction quotient calculation formula for the reaction of amine solvents with acidic gases, the material conservation formula for the target blended oil system, and the charge conservation formula for the target blended oil system, a chemical equilibrium model for the target blended oil system is established.

[0091] In one embodiment, solving the chemical equilibrium model until the target blended oil system reaches the target equilibrium state includes: Calculate the reaction quotients of reaction 1 and reaction quotients of reaction 2; Calculate the deviation between the reaction quotient of reaction 1 and the standard value of the reaction equilibrium constant of reaction 1, and calculate the deviation between the reaction quotient of reaction 2 and the standard value of the reaction equilibrium constant of reaction 2; If the deviation between the reaction quotient of reaction 1 and the standard value of the reaction equilibrium constant of reaction 1 is less than the deviation threshold, and the deviation between the reaction quotient of reaction 2 and the standard value of the reaction equilibrium constant of reaction 2 is less than the deviation threshold, then the target compound oil system is judged to have reached the target equilibrium state. If the deviation between the reaction quotient of reaction 1 and the standard value of the reaction equilibrium constant of reaction 1 is not less than the deviation threshold and / or the deviation between the reaction quotient of reaction 2 and the standard value of the reaction equilibrium constant of reaction 2 is not less than the deviation threshold, then the component concentrations of the corresponding reactions are adjusted, and the reaction quotients of the corresponding reactions are calculated, as well as the deviations between the reaction quotients of the corresponding reactions and the standard values ​​of the reaction equilibrium constants are calculated, until the deviation between the reaction quotient of reaction 1 and the standard value of the reaction equilibrium constant of reaction 1 is less than the deviation threshold, and the deviation between the reaction quotient of reaction 2 and the standard value of the reaction equilibrium constant of reaction 2 is less than the deviation threshold, then the target compound oil system has reached the target equilibrium state.

[0092] In one embodiment, the reaction quotient of reaction 1 is calculated based on the following formula: ; in, Q 1 is the reaction quotient of reaction 1; for The concentration; for The concentration; for The concentration; for The concentration; Calculate the reaction quotient of reaction 2 based on the following formula: ; in, Q 2 is the reaction quotient of reaction 2; for The concentration; for CO The concentration of 2.

[0093] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied 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.

[0094] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0095] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0096] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0097] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0098] Memory may include non-persistent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, like read-only memory (ROM) or flash RAM. Memory is an example of computer-readable media.

[0099] Computer-readable media include both permanent and non-permanent, removable and non-removable media, which can store information using any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. 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, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic magnetic disk storage or other magnetic storage devices, or any other non-transferable medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transient computer-readable media, such as modulated data signals and carrier waves.

[0100] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0101] The above are merely embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A method of determining the structure of a crude oil, characterized by, The method comprises: screening a target compound oil system from each compound oil system based on a first characteristic parameter of the target crude oil and a second characteristic parameter of each compound oil system; establishing a chemical equilibrium model of the target compound oil system based on the reaction of the amine solvent and the acidic gas according to the content of the acidic gas and the content of the amine solvent in the target crude oil; solving the chemical equilibrium model until the target compound oil system reaches a target equilibrium state, and taking the structure of the target compound oil system corresponding to the target equilibrium state as the structure of the target crude oil.

2. The crude oil structure determination method according to claim 1, characterized by, The screening of the target compound oil system from each compound oil system based on the first characteristic parameter of the target crude oil and the second characteristic parameter of each compound oil system comprises: determining the compound oil system closest to the target crude oil in property from each compound oil system based on the first characteristic parameter of the target crude oil and the second characteristic parameter of each compound oil system, and taking the compound oil system as the target compound oil system.

3. The crude oil structure determination method according to claim 1, characterized by, The acidic gas comprises H2S and CO2, and the amine solvent comprises N-methyldiethanolamine.

4. The crude oil structure determination method according to claim 3, characterized by, The reaction of the amine solvent and the acidic gas is as follows: Reaction 1: ; Reaction 2: ; In Reaction 1 and Reaction 2, denotes N-methyldiethanolamine.

5. The crude oil structure determination method of claim 1, wherein, The establishment of the chemical equilibrium model of the target compound oil system based on the reaction of the amine solvent and the acidic gas comprises: establishing the chemical equilibrium model of the target compound oil system according to a reaction quotient calculation formula corresponding to the reaction of the amine solvent and the acidic gas, a material conservation formula of the target compound oil system and a charge conservation formula of the target compound oil system.

6. The crude oil structure determination method according to claim 4, characterized by, The solving of the chemical equilibrium model until the target compound oil system reaches the target equilibrium state comprises: calculating the reaction quotient of reaction 1 and the reaction quotient of reaction 2; calculating the deviation between the reaction quotient of reaction 1 and the standard value of the reaction equilibrium constant of reaction 1, and calculating the deviation between the reaction quotient of reaction 2 and the standard value of the reaction equilibrium constant of reaction 2; if the deviation between the reaction quotient of reaction 1 and the standard value of the reaction equilibrium constant of reaction 1 is less than a deviation threshold value, and the deviation between the reaction quotient of reaction 2 and the standard value of the reaction equilibrium constant of reaction 2 is less than the deviation threshold value, it is judged that the target compound oil system reaches the target equilibrium state; if the deviation between the reaction quotient of reaction 1 and the standard value of the reaction equilibrium constant of reaction 1 is not less than the deviation threshold value and / or the deviation between the reaction quotient of reaction 2 and the standard value of the reaction equilibrium constant of reaction 2 is not less than the deviation threshold value, the concentration of the corresponding reaction is adjusted, the reaction quotient of the corresponding reaction is calculated, and the deviation between the reaction quotient of the corresponding reaction and the standard value of the reaction equilibrium constant is calculated until the deviation between the reaction quotient of reaction 1 and the standard value of the reaction equilibrium constant of reaction 1 is less than the deviation threshold value, and the deviation between the reaction quotient of reaction 2 and the standard value of the reaction equilibrium constant of reaction 2 is less than the deviation threshold value, then the target compound oil system reaches the target equilibrium state.

7. The crude oil structure determination method according to claim 6, characterized by, The reaction quotient of reaction 1 is calculated based on the following formula: ； wherein, Q 1 is the reaction quotient for reaction 1 ; is a concentration of; is a concentration of; is a concentration of; is a concentration of; The reaction quotient of reaction 2 is calculated based on the following formula: ； wherein, Q 2 is the reaction quotient of reaction 2; is a concentration of; is CO 2 a concentration of.

8. A crude oil structure determination apparatus characterized by comprising: comprises: a screening module configured to screen a target compound oil system from each compound oil system based on a first characteristic parameter of the target crude oil and a second characteristic parameter of each compound oil system; The model establishing module is configured to establish a chemical equilibrium model of the target compounded oil system based on the reaction between the amine solvent and the acid gas according to the content of the acid gas and the content of the amine solvent in the target crude oil. The solving module is configured to solve the chemical equilibrium model until the target compounded oil system reaches a target equilibrium state, and take the structure of the target compounded oil system in the target equilibrium state as the structure of the target crude oil.

9. A processor, comprising: A processor configured to perform the crude oil structure determination method according to any one of claims 1 to 7.

10. A machine-readable storage medium having stored thereon instructions, the instructions being executable by a machine to cause the machine to: The instructions, when executed by a processor, cause the processor to be configured to perform the crude oil structure determination method according to any one of claims 1 to 7.

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