Method for judging density of crude oil based on three-dimensional quantitative fluorescence technology and related device

Abstract

The invention discloses a method for judging crude oil density based on a three-dimensional quantitative fluorescence technology and a related device. The method comprises the steps of obtaining fluorescence data of a rock core and rock debris; performing mathematical statistics, parameter extraction, combined calculation and sensitivity screening on the fluorescence data to obtain oil index parameters; and establishing a two-dimensional evaluation chart according to the oil index parameters, and displaying different crude oil density distribution areas. According to the method, parameters such as fluorescence excitation, emission wavelength, oil concentration, crude oil fluorescence intensity, well completion oil testing crude oil density and the like of a rock core and rock debris three-dimensional quantitative fluorescence technology are obtained through mathematical statistics, parameter extraction, combined calculation and sensitivity screening, and the corresponding relation between the three-dimensional quantitative analysis wavelength and the fluorescence intensity parameter is fully excavated and utilized; the correlation is analyzed, the accuracy of the obtained result is higher, and the error range is smaller than 5%.

Description

Technical Field

[0001] The invention relates to the field of oil and gas exploration, and in particular to a method and a related device for judging crude oil density based on three-dimensional quantitative fluorescence technology. Background Art

[0002] In the field of oil exploration, accurate judgment of reservoir crude oil density during logging is crucial to the understanding and judgment of oil content in the exploration well reservoir and the evaluation of fluid properties, especially when selecting the test layer section, the density of hydrocarbons in the reservoir is of greatest concern to the exploration party; because whether the underground oil test with different densities can achieve a breakthrough has different requirements on reservoir porosity, permeability, and physical properties. Low-density crude oil can be produced with low porosity and low permeability, while high-density crude oil has poor fluidity and must have a higher physical property match. Therefore, the judgment of hydrocarbon density is an important factor to be considered in the evaluation of logging fluid properties.

[0003] Prior to the development of the present invention, the commonly used oil quality evaluation technology mainly includes using pyrolysis analysis light-to-heavy ratio and pyrolysis gas chromatography ∑nC21- / ∑nC22+ and other parameters to determine the crude oil density; the data is single, the accuracy of rock chip analysis is not high, and the evaluation result is less consistent with the actual crude oil density in the oil test, especially the ∑nC21- / ∑nC22+ analysis of rock chip samples of condensate oil and light oil is inaccurate and has poor practicality; and these two methods are mainly applicable to medium to heavy oil. For condensate oil and gas reservoirs such as tight sandstone, they are not very suitable for identifying oil quality and are not regionally targeted. Summary of the invention

[0004] The purpose of the present invention is to provide a method and related device for determining crude oil density based on three-dimensional quantitative fluorescence technology, so as to solve the problems of low determination accuracy, low interpretation conformity rate, and inaccurate determination of condensate oil and light oil.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] In a first aspect, the present invention provides a method for determining crude oil density based on three-dimensional quantitative fluorescence technology, comprising:

[0007] Obtain fluorescence data of cores and cuttings;

[0008] Fluorescence data are subjected to mathematical statistics, parameter extraction, combined calculation and sensitivity screening to obtain oil quality index parameters;

[0009] A two-dimensional evaluation chart is established based on the oil quality index parameters to display the distribution areas of different crude oil densities.

[0010] Optionally, the fluorescence data include three-dimensional quantitative fluorescence excitation of cores and cuttings, emission wavelength, oil concentration C, crude oil fluorescence intensity F and crude oil density of completion test.

[0011] Optional, specific process of mathematical statistics, parameter extraction, combination calculation and sensitivity screening:

[0012] The excitation wavelength, emission wavelength, oil concentration C, crude oil fluorescence intensity F, oiliness index and crude oil density parameters of the sampling section for three-dimensional quantitative fluorescence analysis of condensate oil, light oil, medium oil, heavy oil cuttings and core samples were obtained. Based on the fitting calculation of various parameters and crude oil density, variance analysis and other mathematical statistics, five parameters with a strong correlation with crude oil density were screened out.

[0013] Optionally, the five parameters that are strongly correlated with crude oil density include the main peak fluorescence intensity value F1, the secondary peak fluorescence intensity value F2, the oil concentration C, the main peak excitation wavelength λ1, and the main peak emission wavelength λ2.

[0014] Optionally, the oil concentration is mathematically processed during the screening process using a series of comparison levels N converted according to the three-dimensional concentration.

[0015] Optionally, the series comparison level N is a traditional non-legal unit of measurement that reflects the oil content in rock samples. It has a certain mathematical relationship with the oil concentration, and the calculation formula is N=15-﹙4-LogC﹚ / 0.301. The series comparison level N is then combined with the fluorescence intensity value to calculate the oil quality evaluation index YZ. Logarithmic calculation is used in the calculation process to achieve data compression. The calculation formula is YZ=Ln(F2 / F1)*N=Ln(F2 / F1)*[15-﹙4-LogC﹚ / 0.301].

[0016] Optionally, the obtained comprehensive parameters of the oil quality index are used to perform data intersection with the excitation and emission wavelengths in the vertical and horizontal coordinates to establish a two-dimensional evaluation chart.

[0017] In a second aspect, the present invention provides a system for determining crude oil density based on three-dimensional quantitative fluorescence technology, comprising:

[0018] A data acquisition module is used to obtain fluorescence data of cores and cuttings;

[0019] Parameter processing module, used to obtain oil quality index parameters through mathematical statistics, parameter extraction, combined calculation and sensitivity screening of fluorescence data;

[0020] The drawing module is used to establish a two-dimensional evaluation chart based on the oil quality index parameters to display the distribution areas of different crude oil densities.

[0021] In a third aspect, the present invention provides a computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the steps of a method for determining crude oil density based on three-dimensional quantitative fluorescence technology are implemented.

[0022] In a fourth aspect, the present invention provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the steps of a method for determining crude oil density based on three-dimensional quantitative fluorescence technology.

[0023] Compared with the prior art, the present invention has the following technical effects:

[0024] Based on the existing three-dimensional quantitative fluorescence technology for evaluating reservoir oil concentration and identifying true and false oil and gas displays, the present invention fully explores and utilizes the correspondence between three-dimensional quantitative analysis wavelength and fluorescence intensity parameters, analyzes their correlation, and innovatively proposes the concept of oil quality evaluation index. This method can be used while drilling at the drilling site, has strong on-site applicability, and has good use effect. It can distinguish the density range of 0.77-0.95g / cm3, which is condensate oil, light oil, medium oil, heavy oil, and extra heavy oil.

[0025] The present invention obtains the fluorescence excitation, emission wavelength, oil concentration, crude oil fluorescence intensity and crude oil density of completion test of core and cuttings three-dimensional quantitative fluorescence technology through mathematical statistics, parameter extraction, combined calculation and sensitivity screening. The correspondence between the three-dimensional quantitative analysis wavelength and the fluorescence intensity parameter is fully explored and utilized, and the correlation is analyzed. The result obtained is more accurate and the error range is less than 5%. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 (λ1-250)-YZ oil quality evaluation model.

[0027] Figure 2 (λ2-250)-YZ oil quality evaluation model.

[0028] Figure 3 It is a flow chart of the present invention.

[0029] Figure 4 This is a system structure diagram of the present invention. DETAILED DESCRIPTION

[0030] The present invention is further described below in conjunction with the accompanying drawings:

[0031] Embodiment 1:

[0032] See also Figure 1 and Figure 4 , a method for determining crude oil density based on three-dimensional quantitative fluorescence technology, including:

[0033] Obtain fluorescence data of cores and cuttings;

[0034] Fluorescence data are subjected to mathematical statistics, parameter extraction, combined calculation and sensitivity screening to obtain oil quality index parameters;

[0035] A two-dimensional evaluation chart is established based on the oil quality index parameters to display the distribution areas of different crude oil densities.

[0036] Based on the existing three-dimensional quantitative fluorescence technology for evaluating reservoir oil concentration and identifying true and false oil and gas displays, the present invention fully explores and utilizes the correspondence between three-dimensional quantitative analysis wavelength and fluorescence intensity parameters, analyzes their correlation, and innovatively proposes the concept of oil quality evaluation index. This method can be used while drilling at the drilling site, has strong on-site applicability, and has good use effect. It can distinguish the density range of 0.77-0.95g / cm3, which is condensate oil, light oil, medium oil, heavy oil, and extra heavy oil.

[0037] Embodiment 2, the scheme described in Embodiment 1 is specifically:

[0038] Fluorescence data include three-dimensional quantitative fluorescence excitation of cores and cuttings, emission wavelength, oil concentration C, crude oil fluorescence intensity F and crude oil density of completion test.

[0039] The specific process of mathematical statistics, parameter extraction, combination calculation and sensitivity screening:

[0040] The excitation wavelength, emission wavelength, oil concentration C, crude oil fluorescence intensity F, oiliness index and crude oil density parameters of the sampling section for three-dimensional quantitative fluorescence analysis of condensate oil, light oil, medium oil, heavy oil cuttings and core samples were obtained. Based on the fitting calculation of various parameters and crude oil density, variance analysis and other mathematical statistics, five parameters with a strong correlation with crude oil density were screened out.

[0041] The five parameters that are strongly correlated with crude oil density include the main peak fluorescence intensity value F1, the secondary peak fluorescence intensity value F2, the oil concentration C, the main peak excitation wavelength λ1, and the main peak emission wavelength λ2.

[0042] During the screening process, the oil concentration is mathematically processed using a series of comparison levels N converted based on three-dimensional concentrations.

[0043] The series comparison level N is a traditional non-legal unit of measurement that reflects the oil content in rock samples. It has a certain mathematical relationship with the oil concentration and the calculation formula is N = 15-﹙4-LogC﹚ / 0.301. The series comparison level N is then combined with the fluorescence intensity value to calculate the oil quality evaluation index YZ. Logarithmic calculation is used in the calculation process to achieve data compression. The calculation formula is YZ = Ln(F2 / F1)*N = Ln(F2 / F1)*[15-﹙4-LogC﹚ / 0.301].

[0044] The obtained comprehensive parameters of oil quality index are used to intersect the data with the excitation and emission wavelengths in the vertical and horizontal coordinates to establish a two-dimensional evaluation chart.

[0045] The oil quality evaluation index (YZ) is calculated based on the crude oil fluorescence intensity (F1, F2), oil concentration C, series comparison level N and other parameters. The specific meanings of the parameters involved are as follows:

[0046] F1: Fluorescence intensity value of the main peak of three-dimensional quantitative fluorescence; dimensionless; the intensity of the fluorescence emitted by the fluorescent substance in crude oil reflects the amount of fluorescent substance in the sample being tested.

[0047] F2: Three-dimensional quantitative fluorescence secondary peak fluorescence intensity value; dimensionless; the intensity of the fluorescence emitted by the fluorescent substance in the crude oil reflects the amount of fluorescent substance in the sample being tested.

[0048] C: Three-dimensional quantitative fluorescence oil concentration (C) of the sample test, reflecting the oil abundance in the reservoir, in mg / L.

[0049] LogC: The base is (oil concentration C+10), and the logarithm of the oil concentration C is obtained.

[0050] N: Series comparison level converted according to three-dimensional concentration; dimensionless; the fluorescence series comparison level corresponding to the fluorescent substance in the unit sample. It is a traditional non-legal measurement unit that reflects the amount of oil in the rock sample and has a certain mathematical relationship with the oil concentration.

[0051] Three-dimensional quantitative fluorescence main peak wavelength λ: fluorescence excitation wavelength λ1, fluorescence emission wavelength λ2.

[0052] The YZ obtained by the oil quality evaluation index calculation formula is used as the ordinate, and the three-dimensional fluorescence main peak excitation or emission wavelength is used as the abscissa. The two are intersected and different crude oil quality intervals are divided according to the mathematical statistics of the sample points, thus forming an oil quality evaluation chart (see Appendix). Figure 1 , Attachment Figure 2 ). This plate can distinguish the density range of 0.77-0.95g / cm 3 , followed by condensate oil, light oil, medium oil, heavy oil and extra heavy oil.

[0053] The fluorescence data is subjected to mathematical statistics, parameter extraction, combined calculation and sensitivity screening to obtain the oil quality index parameters; the specific process is as follows:

[0054] The excitation wavelength, emission wavelength, oil concentration C, crude oil fluorescence intensity F, oiliness index and crude oil density parameters of the sampling section for three-dimensional quantitative fluorescence analysis of condensate oil, light oil, medium oil, heavy oil cuttings and core samples were obtained. Based on the fitting calculation of various parameters and crude oil density, variance analysis and other mathematical statistics, five parameters with a strong correlation with crude oil density were screened out.

[0055] The five parameters that are strongly correlated with crude oil density include the main peak fluorescence intensity value F1, the secondary peak fluorescence intensity value F2, the oil concentration C, the main peak excitation wavelength λ1, and the main peak emission wavelength λ2.

[0056] During the screening process, the oil concentration is mathematically processed using a series of comparison levels N converted based on three-dimensional concentrations.

[0057] The series comparison level N is a traditional non-legal unit of measurement that reflects the oil content in rock samples. It has a certain mathematical relationship with the oil concentration and the calculation formula is N = 15-﹙4-LogC﹚ / 0.301. The series comparison level N is then combined with the fluorescence intensity value to calculate the oil quality evaluation index YZ. Logarithmic calculation is used in the calculation process to achieve data compression. The calculation formula is YZ = Ln(F2 / F1)*N = Ln(F2 / F1)*[15-﹙4-LogC﹚ / 0.301].

[0058] The present invention obtains the fluorescence excitation, emission wavelength, oil concentration, crude oil fluorescence intensity and crude oil density of completion test of core and cuttings three-dimensional quantitative fluorescence technology through mathematical statistics, parameter extraction, combined calculation and sensitivity screening. The correspondence between the three-dimensional quantitative analysis wavelength and the fluorescence intensity parameter is fully explored and utilized, and the correlation is analyzed. The result obtained is more accurate and the error range is less than 5%.

[0059] In yet another embodiment of the present invention, a system for determining crude oil density based on three-dimensional quantitative fluorescence technology is provided, which can be used to implement the above-mentioned method for determining crude oil density based on three-dimensional quantitative fluorescence technology. Specifically, the system for determining crude oil density based on three-dimensional quantitative fluorescence technology includes:

[0060] A data acquisition module is used to obtain fluorescence data of cores and cuttings;

[0061] Parameter processing module, used to obtain oil quality index parameters through mathematical statistics, parameter extraction, combined calculation and sensitivity screening of fluorescence data;

[0062] The drawing module is used to establish a two-dimensional evaluation chart based on the oil quality index parameters to display the distribution areas of different crude oil densities.

[0063] The division of modules in the embodiments of the present invention is schematic and is only a logical function division. There may be other division methods in actual implementation. In addition, each functional module in each embodiment of the present invention may be integrated into one processor, or may exist physically separately, or two or more modules may be integrated into one module. The above-mentioned integrated modules may be implemented in the form of hardware or in the form of software functional modules.

[0064] In another embodiment of the present invention, a computer device is provided, the computer device comprising a processor and a memory, the memory is used to store a computer program, the computer program comprises program instructions, and the processor is used to execute the program instructions stored in the computer storage medium. The processor may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc., which are the computing core and control core of the terminal, which are suitable for implementing one or more instructions, and are specifically suitable for loading and executing one or more instructions in the computer storage medium to implement the corresponding method flow or corresponding function; the processor described in the embodiment of the present invention can be used for the operation of the method for determining the density of crude oil based on three-dimensional quantitative fluorescence technology.

[0065] In another embodiment of the present invention, the present invention also provides a storage medium, specifically a computer-readable storage medium (Memory), which is a memory device in a computer device for storing programs and data. It is understandable that the computer-readable storage medium here can include both built-in storage media in the computer device and, of course, extended storage media supported by the computer device. The computer-readable storage medium provides a storage space, which stores the operating system of the terminal. In addition, one or more instructions suitable for being loaded and executed by the processor are also stored in the storage space, and these instructions can be one or more computer programs (including program codes). It should be noted that the computer-readable storage medium here can be a high-speed RAM memory or a non-volatile memory, such as at least one disk memory. The processor can load and execute one or more instructions stored in the computer-readable storage medium to implement the corresponding steps of the method for determining crude oil density based on three-dimensional quantitative fluorescence technology in the above embodiment.

[0066] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0067] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0068] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0069] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A method for determining crude oil density based on three-dimensional quantitative fluorescence technology, characterized in that: include: Obtain fluorescence data of cores and cuttings; Fluorescence data are subjected to mathematical statistics, parameter extraction, combined calculation and sensitivity screening to obtain oil quality index parameters; A two-dimensional evaluation chart is established based on the oil quality index parameters to display the distribution areas of different crude oil densities.

2. The method for determining crude oil density based on three-dimensional quantitative fluorescence technology according to claim 1, characterized in that: Fluorescence data include three-dimensional quantitative fluorescence excitation of cores and cuttings, emission wavelength, oil concentration C, crude oil fluorescence intensity F and crude oil density of completion test.

3. The method for determining crude oil density based on three-dimensional quantitative fluorescence technology according to claim 1, characterized in that: The specific process of mathematical statistics, parameter extraction, combination calculation and sensitivity screening: The excitation wavelength, emission wavelength, oil concentration C, crude oil fluorescence intensity F, oiliness index and crude oil density parameters of the sampling section for three-dimensional quantitative fluorescence analysis of condensate oil, light oil, medium oil, heavy oil cuttings and core samples were obtained. Based on the fitting calculation of various parameters and crude oil density, variance analysis and other mathematical statistics, five parameters with a strong correlation with crude oil density were screened out.

4. The method for determining crude oil density based on three-dimensional quantitative fluorescence technology according to claim 3, characterized in that: The five parameters that are strongly correlated with crude oil density include the main peak fluorescence intensity value F1, the secondary peak fluorescence intensity value F2, the oil concentration C, the main peak excitation wavelength λ1, and the main peak emission wavelength λ2.

5. The method for determining crude oil density based on three-dimensional quantitative fluorescence technology according to claim 3, characterized in that: During the screening process, the oil concentration is mathematically processed using a series of comparison levels N converted based on three-dimensional concentrations.

6. The method for determining crude oil density based on three-dimensional quantitative fluorescence technology according to claim 5, characterized in that: The series comparison level N is a traditional non-legal unit of measurement that reflects the oil content in rock samples. It has a certain mathematical relationship with the oil concentration and the calculation formula is N = 15-﹙4-LogC﹚ / 0.

301. The series comparison level N is then combined with the fluorescence intensity value to calculate the oil quality evaluation index YZ. Logarithmic calculation is used in the calculation process to achieve data compression. The calculation formula is YZ = Ln(F2 / F1)*N = Ln(F2 / F1)*[15-﹙4-LogC﹚ / 0.301].

7. The method for determining crude oil density based on three-dimensional quantitative fluorescence technology according to claim 1, characterized in that: The obtained comprehensive parameters of oil quality index are used to intersect the data with the excitation and emission wavelengths in the vertical and horizontal coordinates to establish a two-dimensional evaluation chart.

8. A system for determining crude oil density based on three-dimensional quantitative fluorescence technology, characterized in that: include: A data acquisition module is used to obtain fluorescence data of cores and cuttings; Parameter processing module, used to obtain oil quality index parameters through mathematical statistics, parameter extraction, combined calculation and sensitivity screening of fluorescence data; The drawing module is used to establish a two-dimensional evaluation chart based on the oil quality index parameters to display the distribution areas of different crude oil densities.

9. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the method for determining crude oil density based on three-dimensional quantitative fluorescence technology as described in any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the method for determining crude oil density based on three-dimensional quantitative fluorescence technology as described in any one of claims 1 to 7 are implemented.

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