NMR Porosity Estimation Correcting Formate Brine Hydrogen Index
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Solution Overview
Problem
Formate brine used in drilling muds interferes with traditional logging technologies, leading to underestimation of formation porosity due to its lower hydrogen index, necessitating a method to correct hydrogen index measurements for accurate porosity estimation.
Innovation Solution
A system and method utilizing nuclear magnetic resonance (NMR) measurements, where total NMR data is separated into hydrocarbon and non-hydrocarbon components, with a correction factor applied to the non-hydrocarbon data based on the hydrogen index of formate brine to estimate porosity accurately.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If formate brine is used as drilling mud, then drilling operations can be performed in high temperature and high pressure conditions, but traditional logging technologies cannot accurately measure formation porosity
Solution Approach 1:
The patent applies parameter changes by modifying the hydrogen index value used in porosity calculations. Instead of using the standard hydrogen index for water, the system adjusts this parameter to account for the lower hydrogen index of formate brine, thereby correcting the porosity measurement accuracy under high temperature and pressure drilling conditions
2Object-affected harmful factors
If formate brine is used as drilling mud, then environmentally friendly drilling can be achieved, but hydrogen index measurement errors lead to porosity underestimation
Solution Approach 1:
The patent implements feedback by using the known hydrogen index of formate brine to correct the NMR measurement results. The system incorporates this correction factor into the porosity calculation, ensuring that the lower hydrogen index of formate brine is accounted for, thereby recovering accurate porosity information that would otherwise be lost due to measurement errors
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach provides a more accurate estimation of formation porosity by accounting for the hydrogen index of formate brine, mitigating underestimation and overestimation errors in porosity calculations.
Implementation Method 1
performing a nuclear magnetic resonance (NMR) measurement on fluid in the earth formation with an NMR instrument disposed at the carrier
Data Source
AI summary
A system and method estimate a property of an earth formation comprising hydrocarbon and non-hydrocarbon components. The method includes conveying a carrier down a borehole penetrating the earth formation, and performing a nuclear magnetic resonance (NMR) measurement on fluid in the earth formation with an NMR instrument disposed at the carrier to provide total NMR measurement data. The method also includes separating the total NMR measurement data into hydrocarbon-resultant NMR measurement data and non-hydrocarbon-resultant NMR measurement data, scaling a portion of the non-hydrocarbon-resultant NMR measurement data based on a correction factor to obtain scaled non-hydrocarbon-resultant NMR measurement data, and estimating the property based on the hydrocarbon-resultant NMR measurement data and the scaled non-hydrocarbon-resultant NMR measurement data.