Method and system for determining change rule of multi-medium components at different temperatures and pressures

Abstract

The invention discloses a method and a system for determining a change rule of multi-medium components under different temperatures and pressures, and relates to the technical field of thickened oil recovery, the method comprises the following steps: determining a wellhead-bottom enthalpy difference thermodynamic triangular chart according to an established wellhead and bottom thermodynamic enthalpy triangular chart; determining a thermodynamic triangular chart of the volume expansion coefficients of the well mouth and the well bottom according to the established triangular charts of the volume expansion coefficients of the well mouth and the well bottom; and according to the thermodynamic triangular chart of the well mouth-well bottom enthalpy difference and the thermodynamic triangular chart of the well mouth-well bottom thickened oil volume expansion coefficient, determining the change rule of the multi-medium components under different temperatures and pressures. According to the method, the parameters such as enthalpy values and volume expansion coefficients of the multi-element thermal fluid with different proportions under the combined action of wellhead and bottom hole temperatures and pressures are obtained by utilizing the multi-element medium change chart, and the change rule of fluid properties along with components in the injection and development process of the multi-element thermal fluid is determined, so that reference indexes are more accurate and comprehensive.

Description

Technical Field

[0001] The present invention relates to the technical field of heavy oil production, and in particular to a method and system for determining the variation law of multi-media components under different temperatures and pressures. Background Art

[0002] Heavy oil reserves are extremely abundant worldwide, accounting for approximately 70% of the world's total oil resources, making it a significant unconventional oil resource. However, the development of various types of heavy and heavy oil reservoirs currently faces challenges such as poor development results and slow oil recovery rates. Currently, heavy oil recovery technologies are primarily divided into cold recovery technologies (including water flooding, alkali flooding, polymer flooding, surfactant flooding, microbial oil recovery, gas miscible flooding, solvent extraction, chemical huff and puff, open-pit mining, electrospray pumping, and progressive cavity pump sand recovery) using chemicals, microorganisms, and gases as media, and thermal recovery technologies (including hot water flooding, steam flooding, steam huff and puff, reservoir combustion, steam-assisted gravity drainage, and multi-component thermal fluid huff and puff) using hot water / steam as the primary media. Among these, steam injection is the most widely used technology for heavy oil reservoir development, particularly steam huff and puff, which, due to its wide applicability and low recovery costs, holds a dominant position in the development of various heavy oil reservoirs.

[0003] Multicomponent thermal fluid injection technology, a new type of thermal oil recovery method that has emerged in recent years, has been tested in mines both domestically and internationally, achieving varying degrees of oil production enhancement. Unlike conventional steam injection development, multicomponent thermal fluids are composed of multiple components, primarily steam, nitrogen, and carbon dioxide, which work together to achieve oil production enhancement. Optimizing the composition ratio of these multiple components is a key factor influencing the effectiveness of this technology. Furthermore, with the advent of the "dual carbon" goals, energy conservation and emission reduction have become crucial considerations in oilfield exploration and development. Multicomponent thermal fluid technology, by reinjecting the CO2 generated during the throughput process, can achieve zero carbon emissions. Therefore, to better utilize multicomponent thermal fluid injection technology, it is necessary to determine the compositional variations of multicomponent thermal fluids at different temperatures and pressures.

[0004] In their paper "Research on Laser Online Detection of Typical Component Content in Multicomponent Thermal Fluids Injected with Heavy Oil[D]," Lü Yan et al. note that existing methods for measuring component content using laser absorption spectroscopy rely on the fact that the internal structures of water vapor and carbon dioxide gas phase molecules differ. This selective absorption of infrared radiation photons by these gases results in different vibrational-rotational absorption peak intensities and widths, resulting in infrared absorption spectra with "fingerprint" characteristics. Therefore, the laser absorption spectroscopy detection mechanism for water vapor and carbon dioxide gas phase components in multicomponent thermal fluids utilizes the characteristic infrared absorption peaks of gas molecules for quantitative and qualitative analysis. First, existing technologies are unable to detect the proportion of nitrogen in multicomponent media. High temperatures and complex environments significantly interfere with component content detection results, making it impossible to determine the simultaneous variations of the three components. Second, spectral measurement methods are only applicable to temperature fluctuations and are ineffective when temperature and pressure change simultaneously. Furthermore, these methods suffer from drawbacks such as long detection cycles and high costs. Summary of the Invention

[0005] The present invention aims to provide a method and system for determining the variation patterns of multi-media components at different temperatures and pressures. By utilizing two triangular charts, enthalpy and heavy oil volume expansion coefficient, the method determines the variation patterns of multi-media components at different temperatures and pressures, as well as the enthalpy of the multi-media under different ratios and the volume expansion coefficient of heavy oil after injection of the multi-media under different ratios. To achieve this objective, the present invention provides the following technical solutions:

[0006] The present invention provides a method for determining the variation law of multi-medium components under different temperatures and pressures, the method comprising the following steps:

[0007] Determine the wellhead-bottomhole enthalpy difference thermodynamic triangle chart based on the established wellhead and bottomhole thermodynamic enthalpy triangle chart;

[0008] Determine the thermodynamic triangle diagram of wellhead-bottomhole heavy oil volume expansion coefficient based on the established triangle diagram of wellhead and bottomhole volume expansion coefficient;

[0009] According to the wellhead-bottomhole enthalpy difference thermodynamic triangle chart and the wellhead-bottomhole heavy oil volume expansion coefficient thermodynamic triangle chart, the variation law of multi-media components under different temperatures and pressures is determined.

[0010] Furthermore, the method of determining the wellhead-bottomhole enthalpy difference thermodynamic triangle chart based on the established wellhead and bottomhole thermodynamic enthalpy triangle chart includes:

[0011] Obtain the temperature and pressure conditions at the wellhead and bottom of the well, and determine the thermal enthalpy values ​​of each component of the multi-media;

[0012] Multiply by the proportion of each component of the multi-media in the total, and add them together to obtain the total thermal enthalpy values ​​of the wellhead and bottom hole under the temperature and pressure conditions;

[0013] Establishing a wellhead thermodynamic enthalpy triangle chart based on the wellhead and well bottom total thermal enthalpy values;

[0014] Subtracting the wellhead and bottomhole parameters yields the wellhead-bottomhole enthalpy difference thermodynamic triangle diagram.

[0015] Furthermore, the method of determining the wellhead-bottomhole heavy oil volume expansion coefficient thermodynamic triangle chart based on the established wellhead and bottomhole volume expansion coefficient triangle chart includes:

[0016] Obtain the temperature and pressure conditions at the wellhead and bottom of the well to determine the corresponding volume expansion coefficient of heavy oil under the conditions of different component ratios of multi-media;

[0017] Establishing a thermodynamic triangle diagram of the volume expansion coefficients of the wellhead and bottom hole according to the corresponding volume expansion coefficients of the heavy oil under the conditions of different component ratios of the wellhead and bottom hole multi-media;

[0018] Subtracting the wellhead and bottomhole parameters, we can get the thermodynamic triangle diagram of the wellhead-bottomhole heavy oil volume expansion coefficient.

[0019] The present invention also provides a system for determining the variation pattern of multi-media components under different temperatures and pressures, the system comprising:

[0020] A module for establishing a thermodynamic triangle diagram of enthalpy difference between wellhead and bottom hole, used for determining a thermodynamic triangle diagram of enthalpy difference between wellhead and bottom hole based on established thermodynamic triangle diagrams of enthalpy value between wellhead and bottom hole;

[0021] A module for establishing a thermodynamic triangle diagram of the volume expansion coefficient of wellhead-bottomhole heavy oil is used to determine the thermodynamic triangle diagram of the volume expansion coefficient of wellhead-bottomhole heavy oil based on the established triangle diagrams of the volume expansion coefficient of wellhead and bottomhole heavy oil;

[0022] The module for determining the variation law of multi-media components is used to determine the variation law of multi-media components under different temperatures and pressures based on the wellhead-bottomhole enthalpy difference thermodynamic triangle chart and the wellhead-bottomhole heavy oil volume expansion coefficient thermodynamic triangle chart.

[0023] Furthermore, the wellhead-bottomhole enthalpy difference thermodynamic triangle diagram establishment module is specifically used to:

[0024] Obtain the temperature and pressure conditions at the wellhead and bottom of the well, and determine the thermal enthalpy values ​​of each component of the multi-media;

[0025] Multiply by the proportion of each component of the multi-media in the total, and add them together to obtain the total thermal enthalpy values ​​of the wellhead and bottom hole under the temperature and pressure conditions;

[0026] Establishing a wellhead thermodynamic enthalpy triangle chart based on the wellhead and well bottom total thermal enthalpy values;

[0027] Subtracting the wellhead and bottomhole parameters yields the wellhead-bottomhole enthalpy difference thermodynamic triangle diagram.

[0028] Furthermore, the module for establishing the thermodynamic triangle diagram of the wellhead-bottomhole heavy oil volume expansion coefficient is specifically used to:

[0029] Obtain the temperature and pressure conditions at the wellhead and bottom of the well to determine the corresponding volume expansion coefficient of heavy oil under the conditions of different component ratios of multi-media;

[0030] Establishing a thermodynamic triangle diagram of the wellhead and bottom hole volume expansion coefficients according to the corresponding heavy oil volume expansion coefficients under the conditions of different component ratios of the wellhead and bottom hole multi-media;

[0031] Subtracting the wellhead and bottomhole parameters, we can get the thermodynamic triangle diagram of the wellhead-bottomhole heavy oil volume expansion coefficient.

[0032] The technical effects and advantages of the present invention are as follows:

[0033] First, the present invention provides a method for determining the changing law of multi-media components based on drawing a multi-media component change chart. This method can well determine the proportions of steam, carbon dioxide, and nitrogen under different temperature and pressure conditions, and find the optimal proportion of multi-media components under different temperature and pressure conditions.

[0034] Second, the present invention uses a multi-medium change chart to obtain parameters such as the thermal enthalpy value and volume expansion coefficient of multi-component thermal fluids in different proportions under the combined action of wellhead and bottomhole temperature and pressure, and determines the law of change of fluid properties with components during the injection and development of multi-component thermal fluids, making the reference indicators more accurate and comprehensive, laying the foundation for the subsequent optimization of component ratios.

[0035] Third, the method of the present invention does not require experimental operation and can be simulated with the help of software, which has the advantages of short detection cycle and low detection cost.

[0036] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0038] Figure 1This is a flow chart of a method for determining the changing rules of multi-media components under different temperatures and pressures of the present invention;

[0039] Figure 2 This is a triangle chart of wellhead thermodynamic enthalpy values ​​according to an embodiment of the present invention;

[0040] Figure 3 A bottom hole thermodynamic enthalpy triangle diagram according to an embodiment of the present invention;

[0041] Figure 4 This is a thermodynamic triangle diagram of the wellhead-bottomhole enthalpy difference according to an embodiment of the present invention;

[0042] Figure 5 This is a triangle chart of the wellhead volume expansion coefficient according to an embodiment of the present invention;

[0043] Figure 6 This is a triangle chart of the bottom hole volume expansion coefficient according to an embodiment of the present invention;

[0044] Figure 7 This is a thermodynamic triangle diagram of the wellhead-bottomhole heavy oil volume expansion coefficient according to an embodiment of the present invention;

[0045] Figure 8 Schematic diagram of a system for determining the changing rules of multi-media components under different temperatures and pressures according to the present invention. DETAILED DESCRIPTION

[0046] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0047] In order to solve the deficiencies of the prior art, the present invention provides a method for determining the variation law of multi-media components under different temperatures and pressures. Figure 1 This is a flow chart of a method for determining the variation law of multi-media components under different temperatures and pressures of the present invention, as shown in FIG. Figure 1 As shown, the method includes the following steps:

[0048] Step S101: determining a wellhead-bottomhole enthalpy difference thermodynamic triangle chart based on the established wellhead and bottomhole thermodynamic enthalpy triangle charts;

[0049] Step S102: determining a thermodynamic triangle diagram of wellhead-bottomhole heavy oil expansion coefficients based on the established triangle diagram of wellhead and bottomhole volume expansion coefficients;

[0050] Step S103: determining the variation rules of the multi-media components at different temperatures and pressures based on the wellhead-bottomhole enthalpy difference thermodynamic triangle chart and the wellhead-bottomhole heavy oil volume expansion coefficient thermodynamic triangle chart.

[0051] Example:

[0052] Taking the MB oil reservoir as an example, first, the multivariate thermal fluid components of each well are collected and sorted. Then, the components of the multivariate thermal fluid of the actual well group are calibrated in the previously obtained triangular diagram ( Figures 2 to 7 ), the red dots represent the components of the multi-element thermal fluid of the actual well group. Finally, the changes in the characteristic parameters of the multi-element thermal fluid of different wells are analyzed. The red dots are the components of the multi-element thermal fluid of the MB oil field. The wellhead volume coefficient is mainly between 1 and 1.11; the bottom hole volume coefficient is mainly between 1 and 1.07 ( Figures 5 and 6 ), in the MB oil reservoir, the amount of material in the multi-component thermal fluid is less than 0.1, and the volume coefficient change from the wellhead to the bottom of the well (ignoring the wellbore effect) is less than 0.05 ( Figure 7 ).

[0053] The specific steps are as follows:

[0054] Step S101: Determine the thermal enthalpy of each component of the multimedia by the known temperature and pressure conditions of the wellhead, then multiply by the proportion of each component of the multimedia in the total, and finally add them together to obtain the total thermal enthalpy of the wellhead under the temperature and pressure conditions. Figure 2 This is a triangle diagram of thermodynamic enthalpy values ​​at the wellhead end according to an embodiment of the present invention, as shown in FIG. Figure 2 As shown, the wellhead temperature is 500K (226.85℃) and the pressure is 6MPa. Under these temperature and pressure conditions, the enthalpy values ​​of H2O, CO2, and N2 are 16.8kJ / mol, 17.7kJ / mol, and 14.6kJ / mol, respectively. The proportions of each component in the total are 0.7, 0.05, and 0.25, respectively. The total enthalpy value is △H 井口 =16.8×0.7+17.7×0.05+14.6×0.25=16.3096kJ / mol. Then use the same method to obtain the total enthalpy value under the bottom hole temperature and pressure conditions. Figure 3 The bottom hole thermodynamic enthalpy triangle diagram of the embodiment of the present invention is shown as follows: Figure 3 As shown, △H 井底 =15.3×0.7+16.3×0.05+13.5×0.25=14.8467kJ / mol.

[0055] Step S102: Establish a triangle chart of thermodynamic enthalpy values ​​at the wellhead and bottom of the well ( Figures 2 and 3), the three vertices of the triangle chart represent H2O, N2, and CO2 with a proportion of 1 respectively. Connect the three vertices, and divide 10 scales between adjacent vertices. Each scale represents a proportion of 0.1. The values ​​at the three ends decrease in a clockwise direction. Draw a parallel line corresponding to the base through each scale point. The farther the parallel line is from the vertex, the smaller the proportion of the vertex. Each point on the parallel line represents the same proportion of the corresponding vertex.

[0056] Step S103: Subtract the wellhead and bottomhole parameters to obtain the wellhead-bottomhole enthalpy difference thermodynamic triangle diagram. Figure 4 This is a thermodynamic triangle diagram of the wellhead-bottomhole enthalpy difference according to an embodiment of the present invention, as shown in FIG. Figure 4 According to this chart, the enthalpy loss of different proportions of multi-element thermal fluid from the wellhead to the bottom of the well can be determined. The enthalpy loss of this part is mainly due to the loss during the flow in the wellbore.

[0057] Step S104: Given the temperature and pressure conditions at the wellhead, the volume change of the heavy oil after different components (water vapor, N2 and CO2) are mixed with the heavy oil is simulated using PVTSIM software, and the volume expansion coefficients of the heavy oil at the wellhead and bottom hole under the temperature and pressure are divided by the original heavy oil volume. The volume expansion coefficients of the heavy oil at different component ratios under the wellhead temperature and pressure conditions are determined, and a triangular chart of the volume expansion coefficients of the heavy oil at the wellhead is determined. The same steps are used to obtain the triangular chart of the volume expansion coefficients of the bottom hole heavy oil, and finally the thermodynamic triangular chart of the wellhead-bottom hole heavy oil expansion coefficients is obtained. Figure 5 This is a triangle chart of the wellhead volume expansion coefficient according to an embodiment of the present invention; Figure 6 This is a triangle chart of the bottom hole volume expansion coefficient according to an embodiment of the present invention; Figure 7 The thermodynamic triangle diagram of the wellhead-bottomhole heavy oil volume expansion coefficient in the embodiment of the present invention is as follows: Figures 5 to 7 As shown in the figure, the influence of different proportions of multi-component thermal fluids on the volume expansion coefficient of heavy oil under the temperature and pressure conditions of wellhead and bottom hole can be determined, and the change law of multi-media components under different temperatures and pressures can be determined, which has guiding significance for further adjusting the components of multi-component thermal fluids and improving the degree of heavy oil recovery.

[0058] Step S105: Explain the feature distribution of different plates. Figure 4 For example, the black line represents the isothermal enthalpy value line. The closer to the upper right corner of the plate, the greater the enthalpy value, that is, the higher the CO2 ratio, the greater the enthalpy value. Figure 6 For example, the black line segment represents the constant volume expansion coefficient. The closer to the upper right corner of the plate, the larger the volume expansion coefficient, that is, the higher the CO2 ratio, the larger the volume expansion coefficient.

[0059] Based on the same inventive concept, the present invention also provides a system for determining the variation law of multi-media components under different temperatures and pressures. Figure 8FIG. 1 is a schematic diagram of a system for determining the variation law of multi-media components under different temperatures and pressures of the present invention, as shown in FIG. Figure 8 As shown, the system includes: a wellhead-bottomhole enthalpy difference thermodynamic triangle chart establishment module 201, which is used to determine the wellhead-bottomhole enthalpy difference thermodynamic triangle chart based on the established wellhead and bottomhole thermodynamic enthalpy value triangle charts; a wellhead-bottomhole heavy oil volume expansion coefficient thermodynamic triangle chart establishment module 202, which is used to determine the wellhead-bottomhole heavy oil volume expansion coefficient thermodynamic triangle chart based on the established wellhead and bottomhole volume expansion coefficient triangle charts; and a multi-media component variation law determination module 203, which is used to determine the variation law of the multi-media components under different temperatures and pressures based on the wellhead-bottomhole enthalpy difference thermodynamic triangle chart and the wellhead-bottomhole heavy oil volume expansion coefficient thermodynamic triangle chart.

[0060] Furthermore, the wellhead-bottomhole enthalpy difference thermodynamic triangle chart establishing module 201 is specifically used to: obtain the temperature and pressure conditions of the wellhead and bottomhole to determine the thermal enthalpy value of each component of the multi-media; multiply the proportion of each component of the multi-media in the total, and add them to obtain the total thermal enthalpy value of the wellhead and bottomhole under the temperature and pressure conditions; establish a wellhead thermodynamic enthalpy value triangle chart based on the wellhead and bottomhole total thermal enthalpy values; subtract the wellhead and bottomhole parameters to obtain the wellhead-bottomhole enthalpy difference thermodynamic triangle chart.

[0061] Furthermore, the module 202 for establishing a thermodynamic triangle chart of the wellhead-bottomhole heavy oil volume expansion coefficient is specifically configured to: obtain the temperature and pressure conditions at the wellhead and bottomhole to determine the corresponding heavy oil volume expansion coefficient under conditions of different component ratios of the multi-media; establish a thermodynamic triangle chart of the wellhead and bottomhole volume expansion coefficients based on the corresponding heavy oil volume expansion coefficients under conditions of different component ratios of the multi-media at the wellhead and bottomhole; and subtract the wellhead and bottomhole parameters to obtain a thermodynamic triangle chart of the wellhead-bottomhole heavy oil volume expansion coefficient.

[0062] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for determining the variation law of multi-media components under different temperatures and pressures, characterized in that: The method comprises the following steps: Determine the wellhead-bottomhole enthalpy difference thermodynamic triangle chart based on the established wellhead and bottomhole thermodynamic enthalpy triangle chart; Determine the thermodynamic triangle diagram of wellhead-bottomhole heavy oil volume expansion coefficient based on the established triangle diagram of wellhead and bottomhole volume expansion coefficient; According to the wellhead-bottomhole enthalpy difference thermodynamic triangle chart and the wellhead-bottomhole heavy oil volume expansion coefficient thermodynamic triangle chart, the variation law of multi-media components under different temperatures and pressures is determined.

2. The method for determining the variation law of multi-media components under different temperatures and pressures according to claim 1, characterized in that: The method of determining the wellhead-bottomhole enthalpy difference thermodynamic triangle chart based on the established wellhead and bottomhole thermodynamic enthalpy triangle chart includes: Obtain the temperature and pressure conditions at the wellhead and bottom of the well, and determine the thermal enthalpy values ​​of each component of the multi-media; Multiply by the proportion of each component of the multi-media in the total, and add them together to obtain the total thermal enthalpy values ​​of the wellhead and bottom hole under the temperature and pressure conditions; Establishing a wellhead thermodynamic enthalpy triangle chart based on the wellhead and well bottom total thermal enthalpy values; Subtracting the wellhead and bottomhole parameters yields the wellhead-bottomhole enthalpy difference thermodynamic triangle diagram.

3. The method for determining the variation law of multi-media components under different temperatures and pressures according to claim 1 or 2, characterized in that: The method of determining the wellhead-bottomhole heavy oil volume expansion coefficient thermodynamic triangle chart based on the established wellhead and bottomhole volume expansion coefficient triangle chart includes: Obtain the temperature and pressure conditions at the wellhead and bottom of the well to determine the corresponding volume expansion coefficient of heavy oil under the conditions of different component ratios of multi-media; Establishing a thermodynamic triangle diagram of the volume expansion coefficients of the wellhead and bottom hole according to the corresponding volume expansion coefficients of the heavy oil under the conditions of different component ratios of the wellhead and bottom hole multi-media; Subtracting the wellhead and bottomhole parameters, we can get the thermodynamic triangle diagram of the wellhead-bottomhole heavy oil volume expansion coefficient.

4. A system for determining the variation law of multi-media components under different temperatures and pressures, characterized in that: The system comprises: A module for establishing a thermodynamic triangle diagram of enthalpy difference between wellhead and bottom hole, used for determining a thermodynamic triangle diagram of enthalpy difference between wellhead and bottom hole based on established thermodynamic triangle diagrams of enthalpy value between wellhead and bottom hole; A module for establishing a thermodynamic triangle diagram of the volume expansion coefficient of wellhead-bottomhole heavy oil is used to determine the thermodynamic triangle diagram of the volume expansion coefficient of wellhead-bottomhole heavy oil based on the established triangle diagrams of the volume expansion coefficient of wellhead and bottomhole heavy oil; The module for determining the variation law of multi-media components is used to determine the variation law of multi-media components under different temperatures and pressures based on the wellhead-bottomhole enthalpy difference thermodynamic triangle chart and the wellhead-bottomhole heavy oil volume expansion coefficient thermodynamic triangle chart.

5. The system for determining the variation law of multi-media components under different temperatures and pressures according to claim 4, characterized in that: The wellhead-bottomhole enthalpy difference thermodynamic triangle diagram establishment module is specifically used to: Obtain the temperature and pressure conditions at the wellhead and bottom of the well, and determine the thermal enthalpy values ​​of each component of the multi-media; Multiply by the proportion of each component of the multi-media in the total, and add them together to obtain the total thermal enthalpy values ​​of the wellhead and bottom hole under the temperature and pressure conditions; Establishing a wellhead thermodynamic enthalpy triangle chart based on the wellhead and well bottom total thermal enthalpy values; Subtracting the wellhead and bottomhole parameters yields the wellhead-bottomhole enthalpy difference thermodynamic triangle diagram.

6. A system for determining the variation law of multi-media components under different temperatures and pressures according to claim 4 or 5, characterized in that: The module for establishing the thermodynamic triangle diagram of the wellhead-bottomhole heavy oil volume expansion coefficient is specifically used for: Obtain the temperature and pressure conditions at the wellhead and bottom of the well to determine the corresponding volume expansion coefficient of heavy oil under the conditions of different component ratios of multi-media; Establishing a thermodynamic triangle diagram of the volume expansion coefficients of the wellhead and bottom hole according to the corresponding volume expansion coefficients of the heavy oil under the conditions of different component ratios of the wellhead and bottom hole multi-media; Subtracting the wellhead and bottomhole parameters, we can get the thermodynamic triangle diagram of the wellhead-bottomhole heavy oil volume expansion coefficient.

Images