Back to results
US 9,752,428 B2Granted
Methods and apparatus to acquire compensated signals for determination of formation parameters
AssigneeHalliburton Energy Services, Inc.
InventorsHsu-Hsiang Wu, Burkay Donderici
Life of this patent
Estimating the term…
Abstract
Various embodiments include apparatus and methods to operate a measurement process in a borehole that uses a symmetric sensor structure or a sensor structure operable to mimic a symmetric sensor structure to provide structural compensation. Apparatus and methods can include a data processing unit to generate compensated signals based on the measurement signals and to determine formation parameters using the compensated signals. Additional apparatus, systems, and methods are disclosed.
Claims16
A method comprising:
- making signal measurements using a symmetric sensor tool, wherein the symmetric sensor tool includes a tool structure on which an upper crossed sensor structure, a lower crossed sensor structure, an upper tilted sensor, and a lower tilted sensor are disposed in a symmetric arrangement with respect to a longitudinal axis of the tool structure such that the upper crossed sensor structure and the upper tilted sensor are spaced apart by a distance at which the lower crossed sensor structure and the lower tilted sensor are spaced apart, the upper crossed sensor structure formed by two co-located tilted sensors and the lower crossed sensor structure formed by two co-located tilted sensors;
- generating ZZ, XZ, ZX, and XX coupling components of a relationship between transmitted signals and received signals relative to a formation from the signal measurements;
- generating a set of compensated signals from the coupling components;
- and
- performing an inversion operation using the set of compensated signals to determine one or more formation parameters.
2 more elements
A method comprising:
- operating a tool in a borehole, the tool having an asymmetric sensor structure;
- making signal measurements, using the asymmetric sensor structure, corresponding to a symmetric sensor tool, the signal measurements collected by shifting the asymmetric sensor structure and taking measurements at the shifted locations such that the asymmetric sensor structure mimics the symmetric sensor tool;
- generating ZZ, XZ, ZX, and XX coupling components of a relationship between transmitted signals and received signals relative to a formation from the signal measurements;
- generating a set of compensated signals from the coupling components including generating compensated signals as
- SignaliComp≡√{square root over (SignaliTup×SignaliTdn)};
- i=1, 2, 3, 4, or 5,
- with Tup being an upper tilted sensor of an asymmetric antenna and SignaliTupbased on coupling components generated with respect to firing the upper tilted sensor, and Tdn being a lower tilted sensor of the asymmetric antenna and SignaliTdn n based on coupling components generated with respect to firing the lower tilted sensor;
- and
- performing an inversion operation using the set of compensated signals to determine one or more formation parameters.
6 more elements
Dependencies are inferred from the claim text.