PREDICTING PROPERTIES OF LIVE OILS FROM NMR MEASUREMENTS
First Claim
1. A method to estimate, using nuclear magnetic resonance (NMR) measurements, a fluid property of live crude oil removed from an earth formation, comprising:
- providing a pressure cell, located on or near the earth'"'"'s surface, in which the live crude oil is disposed;
providing an NMR apparatus capable of making NMR measurements on the live crude oil disposed in the pressure cell;
providing a database linking existing NMR data and the fluid property;
creating a mapping function from a combination of nonlinear functions;
deriving parameters of the mapping function using the database;
acquiring NMR data on the live crude oil using the NMR apparatus;
estimating the fluid property from the acquired NMR data using the mapping function; and
outputting the estimated fluid property.
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Accused Products
Abstract
A fluid property of live crude oil removed from an earth formation is determined using nuclear magnetic resonance (NMR) measurements. A pressure cell, located on or near the earth'"'"'s surface, and in which the live crude oil is disposed, is provided. An NMR tool capable of making NMR measurements on the live crude oil is provided, as is a database linking existing NMR data and the fluid property. A mapping function is created from a combination of radial basis functions and parameters of the mapping function are derived using the database. NMR data are acquired on the live crude oil using the NMR tool, and the fluid property is estimated from the acquired NMR data using the mapping function.
36 Citations
20 Claims
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1. A method to estimate, using nuclear magnetic resonance (NMR) measurements, a fluid property of live crude oil removed from an earth formation, comprising:
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providing a pressure cell, located on or near the earth'"'"'s surface, in which the live crude oil is disposed; providing an NMR apparatus capable of making NMR measurements on the live crude oil disposed in the pressure cell; providing a database linking existing NMR data and the fluid property; creating a mapping function from a combination of nonlinear functions; deriving parameters of the mapping function using the database; acquiring NMR data on the live crude oil using the NMR apparatus; estimating the fluid property from the acquired NMR data using the mapping function; and outputting the estimated fluid property. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A nuclear magnetic resonance (NMR) system to estimate, using nuclear magnetic resonance (NMR) measurements, a fluid property of live crude oil removed from an earth formation, comprising:
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a pressure cell, located on or near the earth'"'"'s surface, in which the live crude oil is disposed; an NMR apparatus capable of making NMR measurements on the live crude oil disposed in the pressure cell; an output device; and a processor capable of;
(1) storing a database linking existing NMR data and the fluid property;
(2) creating a mapping function from a combination of nonlinear functions;
(3) deriving parameters of the mapping function using the database;
(4) storing NMR data on the live crude oil obtained using the NMR apparatus;
(5) estimating the fluid property from the acquired NMR data using the mapping function; and
(6) outputting the estimated fluid property to the output device. - View Dependent Claims (18, 19)
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20. A nuclear magnetic resonance (NMR) system to estimate, using nuclear magnetic resonance (NMR) measurements, a fluid property of live crude oil removed from an earth formation, including a pressure cell, located on or near the earth'"'"'s surface, in which the live crude oil is disposed, an NMR apparatus capable of making NMR measurements on the live crude oil disposed in the pressure cell, a database linking existing NMR data and the fluid property, and a computer-readable medium having a set of computer-readable instructions encoded thereon that, when executed, perform acts comprising:
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creating a mapping function from a combination of nonlinear functions; deriving parameters of the mapping function using the database; acquiring NMR data on the live crude oil using the NMR apparatus; estimating the fluid property from the acquired NMR data using the mapping function; and outputting the estimated fluid property.
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Specification