Interpretation of dielectric tool measurements using general mixing laws
AssigneeHalliburton Energy Services, Inc.
InventorsJunsheng Hou, Baris Guner, Ahmed Fouda
Life of this patent
Estimating the term…
Abstract
Methods for determining water-filled porosity using a general volumetric mixing law and the measurements of a dielectric tool are described. The water-filled porosity estimates are used to obtain water salinity estimates and the optimal parameters of the volumetric mixing law. These estimates are in turn used to generate novel quality indicators.
Claims17
A method to determine parameters of a volumetric mixing law and water salinity using complex measurements obtained by a downhole dielectric tool, the method comprising:
- calculating, using real measurements obtained by the dielectric tool, a first estimate of water-filled porosity;
- calculating, using imaginary measurements obtained by the dielectric tool, a second estimate of water-filled porosity;
- calculating, using complex measurements obtained by the dielectric tool, a third estimate of water-filled porosity;
- calculating values of the volumetric mixing law parameters and water salinity that minimize a difference between at least two of the first, second, or third estimates of water-filled porosity, thereby resulting in an optimal water salinity and volumetric mixing law parameters;
- using the optimal water salinity and volumetric mixing law parameters to determine a final estimate of the water-filled porosity;
- and
- performing a downhole operation based upon the final estimate of the water-filled porosity.
A system to determine parameters of a volumetric mixing law and water salinity using complex measurements obtained by a downhole dielectric tool, the system comprising:
- a dielectric tool;
- and
- processing circuitry communicably coupled to the dielectric tool to perform operations comprising:
- calculating, using real measurements obtained by the dielectric tool, a first estimate of water-filled porosity;
- calculating, using imaginary measurements obtained by the dielectric tool, a second estimate of water-filled porosity;
- calculating, using complex measurements obtained by the dielectric tool, a third estimate of water-filled porosity;
- calculating values of the volumetric mixing law parameters and water salinity that minimize a difference between at least two of the first, second, or third estimates of water-filled porosity, thereby resulting in an optimal water salinity and volumetric mixing law parameters;
- using the optimal water salinity and volumetric mixing law parameters to determine a final estimate of the water-filled porosity;
- and
- performing a downhole operation based upon the final estimate of the water-filled porosity.
Dependencies are inferred from the claim text.