Methods and Apparatus to Characterize Stock-Tank Oil During Fluid Composition Analysis
AssigneeSchlumberger Technology Corporation
InventorsChengli Dong, Peter S. Hegeman
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Abstract
Methods and apparatus to characterize stock-tank oil during fluid composition analysis are disclosed. A disclosed example method to characterize a fluid associated with an underground geological formation comprises obtaining a sample of the fluid associated with the underground geological formation, determining, in a borehole associated with the underground geological formation, a stock-tank oil type for the sample of the fluid associated with the underground geological formation, and determining a property of the fluid associated with the underground geological formation based on the stock-tank oil type.
Claims32
A method to characterize a fluid associated with an underground geological formation, the method comprising:
- obtaining a sample comprising the fluid associated with the underground geological formation;
- determining, in a borehole associated with the underground geological formation, a stock-tank oil type for the sample associated with the underground geological formation;
- and
- determining a property of the sample associated with the underground geological formation based on the stock-tank oil type.
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An apparatus to characterize a fluid associated with an underground geological formation, the apparatus comprising:
- a device to obtain a sample of the fluid associated with the underground geological formation;
- an optical sensor to measure an optical property of the sample of the fluid;
- and
- an analyzer to determine a stock-tank oil type for the sample of the fluid based on the optical property.
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A method to characterize a fluid associated with an underground geological formation, the method comprising:
- obtaining a sample of the fluid associated with the underground geological formation;
- detecting in situ indications of absorbance of light by the sample of the fluid;
- determining a stock-tank oil type for the sample of the fluid associated wit the underground geological formation based on the detected indications;
- and
- determining a property of the fluid associated with the underground geological formation based on the stock-tank oil type.
A method comprising:
- transmitting light to a sample of an underground geological formation;
- measuring an indication of absorption of the transmitted light by the sample;
- and
- comparing the measured indication of absorption to two or more absorptions for respective ones of two or more hydrocarbon types to determine a parameter of the sample, wherein the two or more hydrocarbon types include at least a waxy hydrocarbon and a non-waxy hydrocarbon.
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Dependencies are inferred from the claim text.