CN112761627B - Crude oil viscosity calculation method for offshore sandstone oil reservoir stratum - Google Patents
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- 239000010779 crude oil Substances 0.000 title claims abstract description 382
- 238000004364 calculation method Methods 0.000 title claims abstract description 111
- 239000003921 oil Substances 0.000 title claims abstract description 105
- 238000004458 analytical method Methods 0.000 claims abstract description 108
- 238000000034 method Methods 0.000 claims abstract description 92
- 230000000704 physical effect Effects 0.000 claims abstract description 67
- 239000003208 petroleum Substances 0.000 claims abstract description 60
- 230000015572 biosynthetic process Effects 0.000 claims description 106
- 238000007872 degassing Methods 0.000 claims description 68
- 238000002474 experimental method Methods 0.000 claims description 46
- 239000003129 oil well Substances 0.000 claims description 37
- 238000012937 correction Methods 0.000 claims description 12
- 238000012360 testing method Methods 0.000 abstract description 29
- 238000005070 sampling Methods 0.000 abstract description 17
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- 239000007789 gas Substances 0.000 description 18
- 239000000084 colloidal system Substances 0.000 description 14
- 238000005259 measurement Methods 0.000 description 11
- 238000004817 gas chromatography Methods 0.000 description 8
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 8
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- 229930195733 hydrocarbon Natural products 0.000 description 4
- 150000002430 hydrocarbons Chemical class 0.000 description 4
- 239000003345 natural gas Substances 0.000 description 4
- 239000003209 petroleum derivative Substances 0.000 description 4
- 238000003556 assay Methods 0.000 description 3
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- 238000006065 biodegradation reaction Methods 0.000 description 2
- 238000009933 burial Methods 0.000 description 2
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
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Abstract
The application discloses a calculation method for the viscosity of crude oil in a marine sandstone oil reservoir stratum, which relates to the technical field of sandstone oil reservoir development. The method has wide application range, is flexible and is easy to operate; the method II can accurately calculate the viscosity of the stratum crude oil only by using the API degree of the petroleum relative density, the method has very few experimental parameters for analyzing the physical properties of the crude oil, can accurately calculate the viscosity of the stratum crude oil, reduces the sampling and testing cost in the development process of the oil field, can reduce part of testing and analyzing parameters when carrying out ground sampling and analysis in the future, and saves the sampling and testing cost.
Description
Technical Field
The application relates to the technical field of oil and gas field development, in particular to a method for calculating crude oil viscosity of an offshore sandstone oil reservoir stratum.
Background
The viscosity of the stratum crude oil is an important parameter which is indispensable for determining the oil reservoir type, formulating an oil field development scheme and carrying out oil reservoir engineering calculation, and is a foundation for researching the oil field driving type, determining the oil field development mode and selecting an oil well working system.
Aiming at the determination method of the viscosity of the stratum crude oil, a plurality of students at home and abroad research and also put forward a corresponding method. The current methods for obtaining the viscosity of crude oil in stratum mainly comprise four methods: the method comprises the steps of (1) directly obtaining the crude oil by utilizing crude oil phase state characteristic experiments; (2) Adopting an analogy method, and using the actual measurement formation crude oil viscosity of the adjacent oil field, the adjacent block or the adjacent layer, and comparing the actual measurement formation crude oil viscosity of the far block or the far layer if the adjacent block or the adjacent layer is not available; (3) empirical formula method; and (4) carrying out regression on the measured data of the oil field.
The main disadvantages of the prior art are three points: (1) Part of the oil fields are affected by development investment, development stage and the like, and crude oil phase characteristic experiments are not needed or are fewer, so that stratum crude oil viscosity is difficult to obtain through the crude oil phase characteristic experiments, and even if the stratum crude oil viscosity is obtained through the crude oil phase characteristic experiments, analysis is carried out only through limited sample points obtained before the development of the oil fields, and the rules of each layer of the multi-layer oil reservoir with complex structures cannot be effectively represented; (2) The oil field has complex structure, more broken blocks, more longitudinal layers, large difference of crude oil viscosity of the planar longitudinal stratum and complex distribution rule, so that errors are larger when borrowing by analogy with other oil fields or layers; (3) Although many scholars at home and abroad research the formation crude oil viscosity calculation method, also establish the formation crude oil viscosity calculation method of own oil field, because the formation crude oil viscosity is greatly influenced by oil sources, construction activities, burial depths, side bottom water oxidation and biodegradation, the crude oil chemical composition of each oil field, the temperature under the formation condition, the dissolved gas oil ratio and the like are greatly different, the empirical formulas or regression formulas can only be generally applied to the condition similar to the crude oil property of the oil field and the original experimental data, but if the empirical formulas are not selected to be applied to other conditions, unreliable results can be generated, the correlation of the formation crude oil viscosity calculation formulas in the prior art is poor in the target area through trial calculation, the errors are large, the direct correction effect of the coefficients of the formulas is poor, and the formulas are not suitable for popularization in the target area.
Disclosure of Invention
The application aims to solve the problem of poor universality of a stratum crude oil viscosity calculation method in the prior art, fully considers the actual situation of an oil field on the basis of the prior art, and provides a calculation method suitable for the stratum crude oil viscosity of an offshore sandstone oil reservoir.
In order to achieve the above object, the present application provides the following technical solutions: a calculation method for crude oil viscosity of an offshore sandstone oil reservoir stratum.
The experimental contents of the physical property analysis of the crude oil in the target area are divided into two types, one type is that the experimental contents are more detailed, and can obtain various ground crude oil physical property calculation parameters for calculating the viscosity of the stratum crude oil, and the other type is that the experimental contents are simpler, and only petroleum relative density API degree can be obtained as the calculation parameters of the viscosity of the stratum crude oil.
When the viscosity of stratum crude oil is calculated for an oil well with complete actual measurement of the physical property calculation parameters of the ground crude oil, the method comprises the following steps:
collecting and arranging all crude oil phase characteristic experimental analysis results and crude oil physical property analysis experimental results of a target area;
selecting calculation parameters according to the experimental analysis results of the crude oil phase characteristics and the experimental analysis results of crude oil physical properties of the target area;
obtaining a relation between the viscosity of the stratum crude oil and the calculated parameter according to the analysis result of the crude oil phase characteristic experiment;
establishing a ground de-gassing crude oil viscosity calculation formula at the formation temperature according to crude oil phase characteristic experimental analysis data;
carrying the established calculation formula of the viscosity of the ground degassing crude oil at the formation temperature into the relation between the viscosity of the formation crude oil and the calculation parameters to obtain the calculation formula of the viscosity of the formation crude oil;
and calculating to obtain the formation crude oil viscosity of the target area through a formation crude oil viscosity calculation formula.
Further, the crude oil phase characteristic experiment and the crude oil physical property analysis experiment are carried out according to GB/T26981-2011 "oil and gas reservoir fluid physical property analysis method", GB/T13610-2014 "composition analysis gas chromatography of natural gas", SY/T5779-2008 "petroleum and sedimentary organic hydrocarbon gas chromatography analysis method", SH/T0604-2000 "crude oil and petroleum product density determination method (U-shaped vibrating tube method").
Furthermore, the calculation parameters are selected fully considering the influence factors of the viscosity of stratum crude oil and the actual conditions of a target area, and the analysis contents of the crude oil physical property parameters on the ground in the analysis results of the phase state characteristics of most oil well crude oil and the crude oil physical property analysis experiment results are complete. The formation crude oil exists in the formation environment and has higher temperature and pressure, and the properties of the formation crude oil are greatly different from those of the ground degassing crude oil in terms of phase characteristics and physical properties. The stratum crude oil dissolves a large amount of gas, colloid asphaltene and the like under high temperature and high pressure, and the dissolution and separation occur when the external temperature and the external pressure change, so that the difference between the property of the stratum crude oil and the property of the ground degassing crude oil also has a certain correlation. According to the prior art, the viscosity of the formation crude oil has a certain correlation with the viscosity of the ground dead crude oil and the density of the ground dead crude oil, and meanwhile, the content of colloid asphaltene, the gas content and the temperature in the crude oil have a great influence on the viscosity of the crude oil, and when the formation pressure is higher than the saturation pressure, the viscosity of the formation crude oil is not greatly increased along with the increase of the pressure. According to the application, by combining stratum crude oil viscosity influencing factors and oilfield reality, preliminary screening is carried out on calculated parameters, and when the stratum crude oil viscosity is calculated for an oil well with complete ground crude oil physical property parameters in crude oil physical property analysis experiment results, the ground degassing crude oil density, the ground degassing crude oil viscosity, the stratum temperature, the temperature corresponding to the ground degassing crude oil viscosity, the dissolved gas oil ratio, the colloid asphaltene content and the like are selected as calculated parameters.
Further, for the acquired calculation parameters, regression fitting is carried out according to the experimental analysis data of the crude oil phase characteristics to determine a formula form and a formula coefficient, and a relational expression between the formation crude oil viscosity and the calculation parameters is established as follows:
wherein mu of -formation crude oil viscosity, mpa·s; mu (mu) oD -ground degassing crude oil viscosity, mpa·s, at formation temperature; psi—colloidal asphaltene content,%; ρ os 15.6 ℃ ground degassing crude oil density, g/cm 3 ；R s Dissolved gas-oil ratio (standard m) 3 /m 3 ) The method comprises the steps of carrying out a first treatment on the surface of the k. and a and b are parameters obtained by regression fitting of analysis data of crude oil phase characteristic experiments of the oil field.
Further, the empirical formula of viscosity of the ground degassing crude oil at the formation temperature is as follows:
wherein mu oD -ground degassing crude oil viscosity, mpa·s, at formation temperature; mu (mu) 50 -ground degassing crude oil viscosity at 50 ℃, mpa·s; t (T) f -formation temperature, c.
Further, a ground degassing crude oil viscosity calculation formula under the formation temperature of a target area is established according to the holding formula, a form of the existing empirical formula is adopted, and then a formula coefficient is determined according to experimental analysis data of crude oil phase characteristics, wherein the ground degassing crude oil viscosity calculation formula under the formation temperature is as follows:
wherein A, B, C is a correction parameter obtained by performing coefficient correction.
Further, the formation crude oil viscosity calculation formula is:
because a considerable part of crude oil physical property analysis experiment results exist in the target area, only the petroleum relative density API degree is tested, and no other tests are performed, and only the 15.6 ℃ ground degassing crude oil density can be obtained through the petroleum relative density API degree. Therefore, the method for calculating the viscosity of the crude oil in the marine sandstone oil reservoir stratum is difficult to use, and therefore, the application also discloses another method for calculating the viscosity of the crude oil in the marine sandstone oil reservoir stratum, which comprises the following steps:
collecting and arranging all crude oil phase characteristic experimental analysis results and crude oil physical property analysis experimental results of a target area;
selecting calculation parameters according to the experimental analysis results of the crude oil phase characteristics and the experimental analysis results of crude oil physical properties of the target area;
carrying out regression fitting on crude oil phase characteristic experimental data of selected calculation parameters to obtain a relational expression of stratum crude oil viscosity and petroleum relative density API degree;
and calculating the formation crude oil viscosity of the oil well in the target area according to the relation between the formation crude oil viscosity and the petroleum relative density API degree.
The technical scheme is suitable for calculating the formation crude oil viscosity of all oil wells with petroleum relative density API degree obtained through crude oil physical property analysis experiments.
Further, the crude oil phase characteristic experiment and the crude oil physical property analysis experiment are carried out according to GB/T26981-2011 "oil and gas reservoir fluid physical property analysis method", GB/T13610-2014 "composition analysis gas chromatography of natural gas", SY/T5779-2008 "petroleum and sedimentary organic hydrocarbon gas chromatography analysis method", SH/T0604-2000 "crude oil and petroleum product density determination method (U-shaped vibrating tube method").
Further, the selection of the calculation parameters fully considers the prior art and the actual condition of the oil field. Since a considerable part of oil well crude oil physical property analysis experiment results exist in the oil field, only the petroleum relative density API degree is tested, and no other tests are performed. According to the prior art, the properties of crude oil under stratum conditions and ground conditions are different and are mainly influenced by temperature, colloid asphaltene content, gas content and the like, so that the API (application program interface) degree of the relative density of petroleum reflects the influence of colloid asphaltene content, gas content, temperature and the like on the viscosity of crude oil after ground degassing to a certain extent. Therefore, when the calculation parameters such as 'ground degassing crude oil viscosity', 'colloid asphaltene content' and the like cannot be directly obtained by a part of oil wells, only 'petroleum relative density API degree' is selected as the calculation parameter according to the principle of 'weak correlation selection' among the parameters.
Further, for the petroleum relative density API degree which can be obtained as a calculation parameter, regression fitting is carried out according to the crude oil phase characteristic experimental analysis data to determine a formula form and a formula coefficient, and the relational expression of the stratum crude oil viscosity and the petroleum relative density API degree is established as follows:
μ of ＝αAPI β (5)
wherein mu of -formation crude oil viscosity, mpa·s; API-Petroleum relative Density API (15.6 ℃); and alpha and beta are parameters obtained by regression fitting of analysis data of crude oil phase characteristic experiments of the oil field.
In the above-mentioned technical solution of the present application, there are two calculation methods for the formation crude oil viscosity, such as the first method (formula 4) and the second method (formula 5). When the content of the assay analysis in the oil well crude oil physical property analysis experimental result of the stratum crude oil viscosity is required to be calculated is complete, the stratum crude oil viscosity can be calculated by simultaneously applying two methods, and according to the actual measurement data and application of the oil field, the two methods are used simultaneouslySurface degassing crude oil density less than 0.95g/cm 3 Or the oil well with the petroleum relative density API degree larger than 17 utilizes the first method and the second method to calculate the viscosity precision of the stratum crude oil, the calculation results can meet the oil reservoir requirement, but the density of the ground degassing crude oil is larger than 0.95g/cm 3 Or the petroleum relative density API degree is smaller than 17, the calculation error of the second method is relatively larger than that of the first method, but the required parameters are fewer, the sampling test cost is reduced, the calculation result can basically meet the requirement of oil reservoir precision, and particularly, when the petroleum relative density API degree test result is only used for an oil well needing to calculate the formation crude oil viscosity, the formation crude oil viscosity can be calculated only by the second method. Because the density of the most part of the oil well ground degassing crude oil in the target area is less than 0.95g/cm 3 Or the API degree of the petroleum relative density is more than 17, so the application and popularization of the second method can greatly reduce the sampling and testing cost in the development process of the oil field, and can reduce part of sampling and testing analysis parameters and save sampling and testing cost when the physical property analysis experiment of the crude oil is carried out in the future. Through field trial, the calculation results of the two stratum crude oil viscosity methods can meet the oil reservoir precision requirement. In practical application, the viscosity of stratum crude oil can be calculated by selecting a corresponding method in combination with the physical property analysis experimental result of the practical crude oil.
Compared with the prior art, the application has the following beneficial effects:
compared with the prior art, the method can accurately calculate the crude oil viscosity of the offshore sandstone oil reservoir stratum by using abundant crude oil physical property analysis experimental data, has smaller calculation result error and effectively improves the calculation precision of the crude oil viscosity of the offshore sandstone oil reservoir stratum. The method has the advantages of wide application range, flexibility, easy operation, high calculation precision, small error and popularization, and is used for trial in other oil field sites of the oil field group.
The application also discloses a method for accurately calculating the viscosity of the stratum crude oil by using the API degree of the petroleum relative density, which has very few experimental parameters for analyzing the physical properties of the crude oil, and can completely and accurately calculate the viscosity of the stratum crude oil by using the method because the API degree of the petroleum relative density of a target area is basically more than 17.
Drawings
FIG. 1 is a graph of formation crude oil viscosity versus surface degassing crude oil physical properties in accordance with some embodiments of the application;
FIG. 2 is a plot of surface degassed crude oil viscosity versus crude oil physical property parameters at formation temperature in some embodiments of the application;
FIG. 3 is a graph of petroleum relative density API gravity versus formation crude oil viscosity in some embodiments of the application.
Detailed Description
The present application will be described in further detail with reference to test examples and specific embodiments. It should not be construed that the scope of the above subject matter of the present application is limited to the following embodiments, and all techniques realized based on the present application are within the scope of the present application.
In the prior art, although many scholars at home and abroad research the formation crude oil viscosity calculation method of own oil field, the formation crude oil viscosity calculation method of own oil field is also established, because the formation crude oil viscosity is greatly influenced by oil sources, construction activities, burial depths, side bottom water oxidation, biodegradation and the like, the differences of crude oil chemical compositions, temperature under formation conditions, dissolved gas oil ratios and the like of each oil field are large, the empirical formulas or regressive formulas can only be generally applied to the condition similar to the crude oil properties of the oil field and the original experimental data, but if the empirical formulas are not selected to be applied to other conditions, unreliable results can be generated, the correlation of the formation crude oil viscosity calculation formulas of the prior art is poor when the oil field is applied, the errors are large, the direct correction effect of the coefficients of the formulas is poor, and the formulas are not suitable for popularization in the oil field.
In order to solve the technical problems, the inventor provides a method for calculating the viscosity of crude oil in a marine sandstone reservoir stratum by combining the actual situation of an oil field aiming at the problem that the method for calculating the viscosity of crude oil in the stratum is poor in universality.
The experimental contents of the physical property analysis of the crude oil in the target area are divided into two types, one type is that the experimental contents are more detailed, and can obtain various ground crude oil physical property calculation parameters for calculating the viscosity of the stratum crude oil, and the other type is that the experimental contents are simpler, and only petroleum relative density API degree can be obtained as the calculation parameters of the viscosity of the stratum crude oil.
When the viscosity of stratum crude oil is calculated for an oil well with complete actual measurement of the physical property calculation parameters of the ground crude oil, the method comprises the following steps:
collecting and arranging all crude oil phase characteristic experimental analysis results and crude oil physical property analysis experimental results of a target area;
selecting calculation parameters according to the experimental analysis results of the crude oil phase characteristics and the experimental analysis results of crude oil physical properties of the target area;
obtaining a relation between the viscosity of the stratum crude oil and the calculated parameter according to the analysis result of the crude oil phase characteristic experiment;
establishing a ground de-gassing crude oil viscosity calculation formula at the formation temperature according to crude oil phase characteristic experimental analysis data;
carrying the established calculation formula of the viscosity of the ground degassing crude oil at the formation temperature into the relation between the viscosity of the formation crude oil and the calculation parameters to obtain the calculation formula of the viscosity of the formation crude oil;
and calculating to obtain the formation crude oil viscosity of the target area through a formation crude oil viscosity calculation formula.
The technical scheme is applicable to the calculation of the formation crude oil viscosity of the oil well with complete actual measurement of the calculation parameters of the physical properties of the ground crude oil.
The crude oil phase characteristic experiment and crude oil physical property analysis experiment are carried out according to GB/T26981-2011 fluid physical property analysis method of oil and gas reservoir, GB/T13610-2014 composition analysis gas chromatography of natural gas, SY/T5779-2008 petroleum and sedimentary organic hydrocarbon gas chromatography, SH/T0604-2000 crude oil and petroleum product density determination method (U-shaped vibrating tube method).
The calculation parameters are selected by fully considering the influence factors of the viscosity of the stratum crude oil and the actual conditions of the target area, and the analysis contents of the crude oil phase characteristic experimental analysis results of most oil wells and the crude oil physical property analysis experimental results on the ground crude oil physical property parameters are complete. The formation crude oil exists in the formation environment and has higher temperature and pressure, and the properties of the formation crude oil are greatly different from those of the ground degassing crude oil in terms of phase characteristics and physical properties. The stratum crude oil dissolves a large amount of gas, colloid asphaltene and the like under high temperature and high pressure, and the dissolution and separation occur when the external temperature and the external pressure change, so that the difference between the property of the stratum crude oil and the property of the ground degassing crude oil also has a certain correlation. According to the prior art, the viscosity of the formation crude oil has a certain correlation with the viscosity of the ground dead crude oil and the density of the ground dead crude oil, and meanwhile, the content of colloid asphaltene, the gas content and the temperature in the crude oil have a great influence on the viscosity of the crude oil, and when the formation pressure is higher than the saturation pressure, the viscosity of the formation crude oil is not greatly increased along with the increase of the pressure. According to the application, by combining stratum crude oil viscosity influencing factors and oilfield reality, preliminary screening is carried out on calculated parameters, and when the stratum crude oil viscosity is calculated for an oil well with complete ground crude oil physical property parameters in crude oil physical property analysis experiment results, the ground degassing crude oil density, the ground degassing crude oil viscosity, the stratum temperature, the temperature corresponding to the ground degassing crude oil viscosity, the dissolved gas oil ratio, the colloid asphaltene content and the like are selected as calculated parameters.
It should be noted that, for the calculation parameters that can be obtained, then regression fitting is performed according to the analysis data of crude oil phase state characteristics to determine the formula form and the formula coefficient, and the relation between the formation crude oil viscosity and the calculation parameters is established as follows:
wherein mu of -formation crude oil viscosity, mpa·s; mu (mu) oD -ground degassing crude oil viscosity, mpa·s, at formation temperature; psi—colloidal asphaltene content,%; ρ os 15.6 ℃ ground degassing crude oil density, g/cm 3 ；R s Dissolved gas-oil ratio (standard m) 3 /m 3 ) The method comprises the steps of carrying out a first treatment on the surface of the k. and a and b are parameters obtained by regression fitting of analysis data of crude oil phase characteristic experiments of the oil field.
The empirical formula of viscosity of the ground degassing crude oil at the formation temperature is as follows:
wherein mu oD -ground degassing crude oil viscosity, mpa·s, at formation temperature; mu (mu) 50 -ground degassing crude oil viscosity at 50 ℃, mpa·s; t (T) f -formation temperature, c.
The method is characterized in that a ground degassing crude oil viscosity calculation formula under the formation temperature of a target area is established by referring to the empirical formula Standing formula, a formula coefficient is determined according to experimental analysis data of crude oil phase characteristics by adopting the form of the existing empirical formula, and the ground degassing crude oil viscosity calculation formula under the formation temperature is as follows:
wherein A, B, C is a correction parameter obtained by performing coefficient correction.
The formation crude oil viscosity calculation formula is as follows:
because a considerable part of crude oil physical property analysis experiment results exist in the target area, only the petroleum relative density API degree is tested, and no other tests are performed, and only the 15.6 ℃ ground degassing crude oil density can be obtained through the petroleum relative density API degree test results. Therefore, the method for calculating the viscosity of the crude oil in the marine sandstone oil reservoir stratum is difficult to use, and therefore, the application also discloses another method for calculating the viscosity of the crude oil in the marine sandstone oil reservoir stratum, which comprises the following steps:
collecting and arranging all crude oil phase characteristic experimental analysis results and crude oil physical property analysis experimental results of a target area;
selecting calculation parameters according to the experimental analysis results of the crude oil phase characteristics and the experimental analysis results of crude oil physical properties of the target area;
carrying out regression fitting on crude oil phase characteristic experimental data of selected calculation parameters to obtain a relational expression of stratum crude oil viscosity and petroleum relative density API degree;
and calculating the formation crude oil viscosity of the oil well in the target area according to the relation between the formation crude oil viscosity and the petroleum relative density API degree.
The technical scheme is applicable to calculation of formation crude oil viscosity of all oil wells for obtaining petroleum relative density API degree through crude oil physical property analysis experiments.
The crude oil phase characteristic experiment and crude oil physical property analysis experiment are carried out according to GB/T26981-2011 fluid physical property analysis method of oil and gas reservoir, GB/T13610-2014 composition analysis gas chromatography of natural gas, SY/T5779-2008 petroleum and sedimentary organic hydrocarbon gas chromatography, SH/T0604-2000 crude oil and petroleum product density determination method (U-shaped vibrating tube method).
It should be noted that, the selection of the calculation parameters fully considers the prior art and the actual situation of the oil field. Since a considerable part of oil well crude oil physical property analysis experiment results exist in the oil field, only the petroleum relative density API degree is tested, and no other tests are performed. According to the prior art, the properties of crude oil under stratum conditions and ground conditions are different and are mainly influenced by temperature, colloid asphaltene content, gas content and the like, so that the petroleum relative density API degree reflects the influence of colloid asphaltene content, gas content, temperature and the like on the viscosity of crude oil after ground degassing to a certain extent, and research data at home and abroad show that the correlation exists between the viscosity of stratum crude oil and the petroleum relative density API degree. Therefore, when the calculation parameters such as 'ground degassing crude oil viscosity', 'colloid asphaltene content' and the like cannot be directly obtained by a part of oil wells, only 'petroleum relative density API degree' is selected as the calculation parameter according to the principle of 'weak correlation selection' among the parameters.
It should be noted that, for the petroleum relative density API degree of the calculation parameters which can be obtained, regression fitting is performed according to the analysis data of crude oil phase state characteristics experiment to determine the formula form and formula coefficient, and the relational expression of the stratum crude oil viscosity and petroleum relative density API degree is established as follows:
μ of ＝αAPI β (5)
wherein mu of -formation crude oil viscosity, mpa·s; API-Petroleum relative Density API (15.6 ℃); and alpha and beta are parameters obtained by regression fitting of analysis data of crude oil phase characteristic experiments of the oil field.
It should be noted that, in the above-mentioned method for calculating the viscosity of crude oil in a formation disclosed in the above-mentioned technical scheme of the present application, there are two calculation methods in total, such as the first method (formula 4) and the second method (formula 5) described above. When the content of the assay analysis in the physical property analysis experimental result of the oil well crude oil which needs to calculate the viscosity of the stratum crude oil is more complete, the viscosity of the stratum crude oil can be calculated by simultaneously applying two methods, and according to the actual measurement data of the oil field and the field trial, the density of the ground degassing crude oil is less than 0.95g/cm when the two methods are simultaneously used 3 Or the oil well with the petroleum relative density API degree larger than 17 utilizes the first method and the second method to calculate the viscosity precision of the stratum crude oil, the calculation results can meet the oil reservoir requirement, but the density of the ground degassing crude oil is larger than 0.95g/cm 3 Or the petroleum relative density API degree is smaller than 17, the calculation error of the second method is relatively larger than that of the first method, but the required parameters are fewer, the sampling test cost is reduced, the calculation result can also meet the oil reservoir requirement, and particularly, when the petroleum relative density API degree test result is only used for an oil well needing to calculate the formation crude oil viscosity, the formation crude oil viscosity can be calculated only by the second method. Due to the vast majority of the target areaThe API degree of the petroleum relative density of the oil separation well is larger than 17, so that the application and popularization of the second method can greatly reduce the sampling and testing cost in the development process of the oil field, and can reduce part of sampling and testing analysis parameters and save sampling and testing cost when the physical property analysis experiment of crude oil is carried out in the future. Through field trial, the calculation results of the two stratum crude oil viscosity methods can meet the oil reservoir precision requirement. In practical application, the viscosity of stratum crude oil can be calculated by selecting a corresponding method in combination with the physical property analysis experimental result of the practical crude oil.
The method for calculating the crude oil viscosity of the marine sandstone oil reservoir stratum disclosed by the application is described below by taking a certain shallow oil reservoir as an example.
The oil reservoir is positioned on a tannage fracture zone, has complex structure, more fracture blocks and more longitudinal oil-containing small layers. Because the crude oil phase characteristic experiment sampling test cost is higher, the crude oil phase characteristic experiment of the oil field is less, a plurality of blocks or small layers do not have the stratum crude oil viscosity obtained by the crude oil phase characteristic experiment, especially the developed area, and the sampling success rate is lower due to the limitation of various factors. Because of the lack of comprehensive and systematic research on the whole oil field, the existing empirical formula adopts an analog borrowing method to borrow the actual measurement formation crude oil viscosity of the adjacent block or the adjacent layer under the condition that the calculation error of the formation crude oil viscosity of the local oil field is larger and under the condition that the actual measurement formation crude oil viscosity is not measured, and if the adjacent block or the adjacent layer is not, the actual measurement formation crude oil viscosity of the far block or the layer is compared. The method is too coarse, which is feasible for blocks with similar oil reservoir characteristics and similar crude oil properties, but the oil field has the characteristics of complex structure, more broken blocks, large difference of crude oil properties of plane longitudinal stratum, complex distribution rule and the like, and the oil reservoir characteristics and the crude oil properties of adjacent blocks tend to have large difference, so that the method is still adopted, inaccurate selection of the stratum crude oil viscosity is caused, the development scheme is caused, and the investment decision of the next step is influenced. The method for calculating the viscosity of the stratum crude oil disclosed by the application can calculate the viscosity of the stratum crude oil by using the rich crude oil physical property analysis experiment results, and provides a basis for accurately calculating the viscosity of the stratum crude oil.
The experimental contents of the physical property analysis of the crude oil in the oil field are divided into two types, one type is that the experimental contents are more detailed, and can obtain various ground crude oil physical property calculation parameters for calculating the viscosity of the crude oil in the stratum, and the other type is that the experimental contents are simpler, and only petroleum relative density API (application program interface) degree can be obtained as the calculation parameters of the viscosity of the crude oil in the stratum.
When the oil well with complete actual measurement ground crude oil physical property calculation parameters calculates the formation crude oil viscosity, the following method is adopted for calculation:
s1: collecting and arranging all crude oil phase characteristic experimental analysis results and crude oil physical property analysis experimental results of a target area;
s2: according to the actual conditions of the target area, analysis contents of physical parameters of ground crude oil in most oil well crude oil phase characteristic experiment analysis results and crude oil physical analysis experiment results are complete, influence factors of the ground crude oil viscosity in the prior art are fully considered, and ground degassing crude oil density, ground degassing crude oil viscosity, formation temperature, temperature corresponding to the ground degassing crude oil viscosity, dissolved gas-oil ratio, colloid asphaltene content and the like are selected as calculation parameters.
S3: for the calculation parameters which can be obtained in the step S2, regression fitting is performed according to the crude oil phase characteristic experimental analysis data obtained in the step S1 to determine a formula form and a formula coefficient, and referring to FIG. 1, a relational expression between the formation crude oil viscosity and the calculation parameters is established as follows:
wherein mu of -formation crude oil viscosity, mpa·s; mu (mu) oD -ground degassing crude oil viscosity, mpa·s, at formation temperature; psi—colloidal asphaltene content,%; ρ os 15.6 ℃ ground degassing crude oil density, g/cm 3 ；R s Dissolved gas-oil ratio (standard m) 3 /m 3 )。
S4: the ground degassing crude oil viscosity empirical formula setting formula at the stratum temperature is as follows:
wherein mu oD -ground degassing crude oil viscosity, mpa·s, at formation temperature; mu (mu) 50 -ground degassing crude oil viscosity at 50 ℃, mpa·s; t (T) f -formation temperature, c.
S5: establishing a calculation formula of the viscosity of the ground degassing crude oil at the formation temperature of the target area by referring to the experimental formula setting formula, determining formula coefficients according to experimental analysis data of the phase characteristics of the crude oil by adopting the form of the existing empirical formula, and obtaining a relational expression of the viscosity of the ground degassing crude oil at the formation temperature of the oil field and the viscosity of the ground degassing crude oil at 50 ℃ by referring to fig. 2:
wherein mu oD -ground degassing crude oil viscosity, mpa·s, at formation temperature; mu (mu) 50 -ground degassing crude oil viscosity at 50 ℃, mpa.s; t (T) f -formation temperature, c.
S6: and (3) introducing the empirical calculation formula of the viscosity of the crude oil in the ground, which is established in the step (S5), into the relation between the viscosity of the crude oil in the ground and the calculated parameters in the step (S3) to obtain a calculation formula of the viscosity of the crude oil in the ground:
wherein mu of -formation crude oil viscosity, mpa·s; mu (mu) 50 -ground degassing crude oil viscosity at 50 ℃, mpa.s; t (T) f -formation temperature, DEG C; psi—colloidal asphaltene content,%; ρ os -ground degassing crude oil density at 15.6 ℃, g/cm3; r is R s Dissolved gas-oil ratio (standard m) 3 /m 3 )。
S7: according to the calculation parameters determined in the step S2, the corresponding calculation parameters obtained in the oil well crude oil physical property analysis experiment collected in the step S1 are arranged, and the formation crude oil viscosity of the oil well in the target area is obtained through calculation according to the formation crude oil viscosity calculation formula in the step S6.
Because a considerable part of crude oil physical property analysis experiment results exist in the target area, only the petroleum relative density API degree is tested, and no other tests are performed, and only the 15.6 ℃ ground degassing crude oil density can be obtained through the petroleum relative density API degree test results. Thus for an oil well where only petroleum relative density API degrees can be obtained, the following method is used:
s8: and (2) collecting the arranged experimental data according to the step (S1), and combining the actual conditions of the target area, wherein part of crude oil physical property analysis experimental results of the oil well only test the API degree of the relative density of the petroleum, and do not test other projects. According to the prior art, the petroleum relative density API degree reflects the influence of the viscosity of the ground degassing crude oil, the content of colloid asphaltene, the gas content, the temperature and the like on the viscosity of the crude oil to a certain extent, and only the petroleum relative density API degree is selected as a calculation parameter according to the principle of weak correlation selection among parameters.
S9: for the calculation parameters determined in the step S8, a formula form and a formula coefficient are determined according to the crude oil phase characteristic experimental analysis data obtained in the step S1, and referring to fig. 3, a relational expression of the formation crude oil viscosity and the petroleum relative density API degree is established:
μ of ＝5.9799×10 9 API -6.5214 (5)
wherein mu of -formation crude oil viscosity, mpa·s; API-Petroleum relative Density API (15.6 ℃).
S10: and (3) according to the petroleum relative density API degree obtained by the physical property analysis experiment of the oil well crude oil collected and finished in the step (S1), calculating and obtaining the stratum crude oil viscosity of the oil well in the target area through the stratum crude oil viscosity calculation formula in the step (S9).
The formation crude oil viscosity of the oil field oil well is calculated by two offshore sandstone oil reservoir formation crude oil viscosity calculation methods disclosed by the application, and the calculation result of the random extraction of part of oil field formation crude oil viscosity is shown in table 1:
TABLE 1
As can be seen from Table 1, when the content of the assay in the experimental results of the physical property analysis of crude oil in oil well, which is required to calculate the viscosity of crude oil in stratum, is relatively complete, two methods can be simultaneously used to calculate the viscosity of crude oil in stratum, and according to the measured data of oil field and the field trial, the density of the crude oil in ground degassing is less than 0.95g/cm when the two methods are simultaneously used 3 Or the oil well with the petroleum relative density API degree larger than 17 utilizes the first method (the first method is abbreviated as in the table 1) and the second method (the second method is abbreviated as in the table 1) to calculate the viscosity precision of the stratum crude oil, and the calculation result can meet the oil reservoir requirement, but the density of the ground degassing crude oil is larger than 0.95g/cm 3 Or the petroleum relative density API degree is smaller than 17, the calculation error of the second method is relatively larger than that of the first method, but the required parameters are fewer, the sampling test cost is reduced, the calculation result can also meet the requirement of oil reservoir precision, and particularly, when the petroleum relative density API degree test result is only used for an oil well needing to calculate the formation crude oil viscosity, the formation crude oil viscosity can be calculated only by the second method. Because the density of the ground de-aerated crude oil of the vast majority of the oil wells of the oil field is less than 0.95g/cm 3 Or the petroleum relative density API is more than 17, the application and popularization of the second method can greatly reduce the sampling and testing cost in the development process of the oil field, and can reduce part of sampling and testing analysis parameters and save sampling and testing cost when the physical property analysis experiment of the crude oil is carried out in the future. Through field trial, the calculation results of the two stratum crude oil viscosity methods can meet the oil reservoir precision requirement. In practical application, the viscosity of stratum crude oil can be calculated by selecting a corresponding method in combination with the physical property analysis experimental result of the practical crude oil.
The preferred embodiments of the present application have been described in detail above, but the present application is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present application within the scope of the technical concept of the present application, and all the simple modifications belong to the protection scope of the present application.
The foregoing description of the preferred embodiments of the application is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the application.
Claims (8)
1. The method for calculating the crude oil viscosity of the marine sandstone oil reservoir stratum is characterized by comprising the following steps of:
collecting and arranging all crude oil phase characteristic experimental analysis results and crude oil physical property analysis experimental results of a target area;
selecting calculation parameters according to the experimental analysis results of the crude oil phase characteristics and the experimental analysis results of crude oil physical properties of the target area;
obtaining a relation between the viscosity of the stratum crude oil and the calculated parameter according to the analysis result of the crude oil phase characteristic experiment;
establishing a ground de-gassing crude oil viscosity calculation formula at the formation temperature according to crude oil phase characteristic experimental analysis data;
the established calculation formula of the viscosity of the ground degassing crude oil at the formation temperature is brought into the relation formula of the viscosity of the crude oil of the formation and the calculation parameters to obtain the calculation formula of the viscosity of the crude oil of the formation, and the viscosity of the crude oil of the formation of the target area is obtained through calculation of the calculation formula of the viscosity of the crude oil of the formation, wherein the calculation formula of the viscosity of the crude oil of the formation is as follows:
wherein k, a and b are parameters obtained by regression fitting of analysis data of crude oil phase characteristic experiments of the oil field; A. b, C are correction parameters obtained after coefficient correction; psi is the colloidal asphaltene content,%; mu (mu) 50 The viscosity of the ground degassing crude oil at 50 ℃ is mPas; t (T) f Is the formation temperature, DEG C; ρ os 15.6deg.C ground degassing crude oil density, g/cm 3 ；R s To dissolve the gas-oil ratio (standard m) 3 /m 3 )。
2. The method for calculating the viscosity of crude oil in a marine sandstone reservoir according to claim 1, wherein the calculated parameters include the density of the ground dead crude oil, the viscosity of the ground dead crude oil, the temperature of the formation, the temperature corresponding to the viscosity of the ground dead crude oil, the dissolved gas oil ratio, and the content of colloidal asphaltenes.
3. The method for calculating the formation crude oil viscosity of the offshore sandstone reservoir according to claim 1, wherein according to the calculation parameters, by performing regression fitting on experimental analysis data of the crude oil phase characteristics, a relational expression between the formation crude oil viscosity and the calculation parameters is established as follows:
wherein mu of -formation crude oil viscosity, mpa·s; mu (mu) oD -ground degassing crude oil viscosity, mpa·s, at formation temperature; psi—colloidal asphaltene content,%; ρ os 15.6 ℃ ground degassing crude oil density, g/cm 3 ；R s Dissolved gas-oil ratio (standard m) 3 /m 3 ) The method comprises the steps of carrying out a first treatment on the surface of the k. and a and b are parameters obtained by regression fitting of analysis data of crude oil phase characteristic experiments of the oil field.
4. The method for calculating the viscosity of crude oil in a marine sandstone reservoir according to claim 3, wherein the empirical formula for the viscosity of the ground degassing crude oil at the temperature of the formation is:
wherein mu oD -ground degassing crude oil viscosity, mpa·s, at formation temperature; mu (mu) 50 -ground degassing crude oil viscosity at 50 ℃, mpa·s; t (T) f -formation temperature, c.
5. The method for calculating the viscosity of crude oil in a marine sandstone reservoir according to claim 4, wherein the calculation formula for the viscosity of ground-degassing crude oil at the temperature of the formation in the target area is established according to the empirical formula and the experimental analysis data of the phase characteristics of crude oil, and is as follows:
wherein A, B, C is a correction parameter obtained by performing coefficient correction.
6. The method for calculating the crude oil viscosity of the marine sandstone oil reservoir stratum is characterized by comprising the following steps of:
collecting and arranging all crude oil phase characteristic experimental analysis results and crude oil physical property analysis experimental results of a target area;
selecting calculation parameters according to the experimental analysis results of the crude oil phase characteristics and the experimental analysis results of crude oil physical properties of the target area;
carrying out regression fitting on crude oil phase characteristic experimental data of selected calculation parameters to obtain a relational expression of stratum crude oil viscosity and petroleum relative density API degree;
calculating and obtaining the formation crude oil viscosity of the oil well in the target area according to the relation between the formation crude oil viscosity and the petroleum relative density API degree;
the formation crude oil viscosity calculation formula is as follows:
wherein k, a and b are parameters obtained by regression fitting of analysis data of crude oil phase characteristic experiments of the oil field; A. b, C are correction parameters obtained after coefficient correction; psi is the colloidal asphaltene content,%; mu (mu) 50 The viscosity of the ground degassing crude oil at 50 ℃ is mPas; t (T) f Is the formation temperature, DEG C; ρ os Is 15Ground degassing crude oil density at 6deg.C, g/cm 3 ；R s To dissolve the gas-oil ratio (standard m) 3 /m 3 )。
7. The method for calculating the crude oil viscosity of an offshore sandstone reservoir formation according to claim 6, wherein: the relation between the viscosity of the stratum crude oil and the API degree of the petroleum relative density is as follows:
μ of ＝αAPI β (5)
wherein mu of -formation crude oil viscosity, mpa·s; API-Petroleum relative Density API (15.6 ℃);
and alpha and beta are parameters obtained by regression fitting of analysis data of crude oil phase characteristic experiments of the oil field.
8. The method for calculating the crude oil viscosity of the marine sandstone reservoir stratum according to claim 6 or 7, which can be applied to calculation of the crude oil viscosity of the stratum in the target area, wherein the API degree of the petroleum relative density is obtained through all crude oil physical property analysis experiments.
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