Gradational resistivity models with local anisotropy for distance to bed boundary inversion
AssigneeHalliburton Energy Services, Inc.
InventorsHsu-Hsiang Wu, Dagang Wu
Life of this patent
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Abstract
In general, in one aspect, embodiments relate to a method and/or system for obtaining one or more measurements collected by a downhole tool at a wellbore depth and defining a piecewise-polynomial inversion model describing one or more formation parameters. Systems and methods herein may further be for performing an inversion on the piecewise-polynomial inversion model to determine one or more formation parameters of the inversion model, and adjusting a path of the downhole tool based at least in part on the or more formation parameters of the piecewise-polynomial inversion model.
Claims20
A computer-implemented method for performing geosteering inversion, the method comprising:
- obtaining one or more measurements related to a geological formation, wherein the one or more measurements are collected by a downhole tool at a wellbore depth within the geological formation;
- based on the one or more measurements at the wellbore depth, defining a formation model representative of one or more formation parameters across one or more layers of the geological formation, wherein the formation model defines the one or more formation parameters at each layer of the one or more layers via a piecewise-polynomial inversion model comprising a plurality of polynomial functions, wherein each polynomial function of the plurality of polynomial functions corresponds to a layer of the one or more layers;
- performing an inversion on the piecewise-polynomial inversion model to determine one or more values of the one or more formation parameters;
- and
- adjusting a path of the downhole tool based at least in part on the one or more values of the one or more formation parameters.
A computer-implemented system for performing geosteering inversion, the system comprising:
- a downhole tool configured to receive an input to adjust the path of the downhole tool and obtain one or more measurements related to a geological formation, wherein the one or more measurements are collected at a wellbore depth within the geological formation;
- and
- an information handling system configured to:
- define, based on the one or more measurements a formation model representative of one or more formation parameters across one or more lavers of the geological formation, wherein the formation model defines the one or more formation parameters at each layer via a piecewise-polynomial inversion model comprising a plurality of polynomial functions, wherein each polynomial function of the plurality of polynomial functions corresponds to a layer of the one or more layers;
- perform an inversion on the piecewise-polynomial inversion model to determine one or more values of the one or more formation parameter;
- and
- produce the input to adjust the path of the downhole tool based at least in part on the one or more values of the one or more formation parameters.
Dependencies are inferred from the claim text.