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US 2020/0264332 A1Published application
Electromagnetic Waves Resistivity Computation Using Accelerated Segmented Lookup Table
AssigneeHalliburton Energy Services, Inc.
InventorWeng Fatt Choo
Life of this patent
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Abstract
A method for well logging may comprise: inserting a downhole tool into a wellbore penetrating a subterranean formation wherein the downhole tool comprises: a transmitter; a receiver; a memory configured to store at least one look up table with polynomial coefficients; and a processor coupled to the memory; obtaining a measurement using the resistivity tool; and generating a resistivity output using the measurement as an input to a polynomial with polynomial coefficients sourced from the look up table.
Claims20
A method for well logging comprising:
- inserting a downhole tool into a wellbore penetrating a subterranean formation wherein the downhole tool comprises:
- a transmitter;
- a receiver;
- a memory configured to store at least one look up table with polynomial coefficients;
- and
- a processor coupled to the memory;
- obtaining a measurement using the downhole tool;
- and
- generating a resistivity output using the measurement as an input to a polynomial with polynomial coefficients sourced from the look up table.
6 more elements
A downhole tool comprising:
- a transmitter;
- a receiver;
- a memory configured to store at least one look up table comprising polynomial coefficients that represent a non-linear function of a measurement versus resistivity, wherein the at least one look up table comprises a plurality of segments, wherein each of the segments correspond to a bounded range of inputs, and wherein each of the segments corresponds to a set of polynomial coefficients;
- and
- a processor coupled to the memory, wherein the processor is configured to:
- compare an input signal to the bounded range of inputs to determine a segment of the plurality of segments the input signal corresponds to;
- retrieve the set of polynomial coefficients corresponding to the determined segment;
- and
- calculate a resistivity output using the input signal as an input to a polynomial comprising the set of polynomial coefficients corresponding to the determined segment.
6 more elements
A system comprising:
- a conveyance;
- and
- a downhole tool coupled to the conveyance, the downhole tool comprising:
- a transmitter;
- a receiver;
- a memory configured to store at least one look up table comprising polynomial coefficients that represent a non-linear function of a measurement versus resistivity;
- and
- a processor coupled to the memory.
5 more elements
Dependencies are inferred from the claim text.