Determining fluid properties from fluid analyzer
First Claim
1. A method for determining properties of a formation fluid, comprising:
- obtaining data related to an optical density at a methane peak and an optical density at an oil peak for a fluid sample at a plurality of times;
calculating an apparent gas-oil-ratio of the fluid sample from the optical density of the fluid sample at the methane peak and the optical density of the fluid sample at the oil peak at more than one of the plurality of times;
selecting a power function of a sampling parameter for a buildup of the apparent gas-oil-ratio;
calculating an exponential constant of the power function based on the data; and
determining at least one selected from the group consisting of a contamination free gas-oil-ratio and a percent contamination.
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Abstract
A method for determining properties of a formation fluid including obtaining data related to an optical density at a methane peak and an optical density at an oil peak for a fluid sample at a plurality of times, calculating an apparent gas-oil-ratio of the sample fluid from the optical density of the fluid sample at the methane peak to the optical density of the fluid sample at the oil peak at each of the plurality of times based on the data, selecting a power function of a sampling parameter for a buildup of the apparent gas-oil-ratio, calculating an exponential constant of the power function based on the data, and determining at least one selected from the group consisting of a contamination free gas-oil-ratio and a percent contamination.
89 Citations
30 Claims
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1. A method for determining properties of a formation fluid, comprising:
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obtaining data related to an optical density at a methane peak and an optical density at an oil peak for a fluid sample at a plurality of times;
calculating an apparent gas-oil-ratio of the fluid sample from the optical density of the fluid sample at the methane peak and the optical density of the fluid sample at the oil peak at more than one of the plurality of times;
selecting a power function of a sampling parameter for a buildup of the apparent gas-oil-ratio;
calculating an exponential constant of the power function based on the data; and
determining at least one selected from the group consisting of a contamination free gas-oil-ratio and a percent contamination. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for determining properties of a formation fluid, comprising:
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obtaining data related to an optical density at a methane peak and at an optical density at an oil peak for a fluid sample at a plurality of times;
calculating an apparent gas-oil-ratio of the sample fluid at the plurality of times based on the data;
selecting an exponential function of a sampling parameter for a buildup of the apparent gas-oil-ratio; and
linearly extrapolating the gas-oil-ratio to a point where a derivative of the exponential function with respect to the sampling parameter is zero. - View Dependent Claims (9, 10, 11, 12)
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13. A method for determining a gas-oil-ratio of a fluid sample, comprising:
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obtaining data related to a methane mass component, a non-methane gaseous hydrocarbon mass component, a liquid phase hydrocarbon mass component, and a carbon dioxide mass component at a plurality of times; and
determining the gas-oil-ratio from the ratio of the methane mass component, the non-methane gaseous hydrocarbon mass component, and the carbon dioxide mass component to the liquid phase hydrocarbon mass component. - View Dependent Claims (14, 15, 16, 17)
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18. A method for determining properties of a formation fluid, comprising:
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obtaining data related to a mass concentration of methane and a mass concentration of liquid phase hydrocarbons for a fluid sample at a plurality of times;
calculating an apparent methane mass concentration and an apparent liquid phase hydrocarbon mass concentration of the fluid sample at each of the plurality of times;
selecting a methane power function of a sampling parameter for a buildup of the apparent methane mass concentration;
selecting a liquid phase power function of the sampling parameter for a buildup of the apparent liquid phase hydrocarbon mass concentration;
determining an exponential constant of the methane power function based on the data;
determining an exponential constant of the liquid phase power function based on the data; and
determining a percent contamination. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26)
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27. A method for determining properties of a formation fluid, comprising:
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obtaining data related to a mass concentration of methane and a mass concentration of liquid phase hydrocarbons for a fluid sample at a plurality of times;
calculating an apparent methane mass concentration and an apparent liquid phase hydrocarbon mass concentration of the fluid sample at each of the plurality of times;
selecting a methane exponential function of a sampling parameter for a buildup of the apparent methane mass concentration;
selecting a liquid phase exponential function of the sampling parameter for a buildup of the apparent liquid phase hydrocarbon mass concentration; and
determining a percent contamination from the data. - View Dependent Claims (28, 29, 30)
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Specification