Patents by Inventor Kristoffer Thomas Walker
Kristoffer Thomas Walker has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20240027644Abstract: A method and system for azimuthal direction detection of a cable. The method may comprise disposing an electromagnetic logging tool into a wellbore, transmitting a primary electromagnetic field from the one or more transmitters, recording one or more secondary electromagnetic fields at the one or more receivers, and identifying a direction to the cable from the one or more secondary electromagnetic fields. The system may comprise one or more transmitters disposed on the electromagnetic logging tool and configured to transmit a primary electromagnetic field. The system may further comprise one or more receivers disposed on the electromagnetic logging tool and configured to record one or more secondary electromagnetic fields. Additionally, the system may further comprise an information handling system configured to identify a direction to an azimuthally localized reduction in metal of the conductor or increase in the metal of the conductor from the secondary electromagnetic fields.Type: ApplicationFiled: February 24, 2023Publication date: January 25, 2024Applicant: Halliburton Energy Services, Inc.Inventors: Baris Guner, Ahmed Fouda, Kristoffer Thomas Walker, Stuart Michael Wood
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Patent number: 11585956Abstract: A method is disclosed for radiaiiy profiling shear velocities of flexural wave modes in a formation. The method includes establishing sensitivity kernels with two non-dimensionalized parameters and using said sensitivity kernels to perform an inversion for radial shear wave velocity profiles. This method may be used for LWD, MWD, or wireline logging operations.Type: GrantFiled: December 31, 2018Date of Patent: February 21, 2023Assignee: Halliburton Energy Services, Inc.Inventors: Yunfei Yang, Kristoffer Thomas Walker
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Publication number: 20220268959Abstract: Apparatus, methods, and systems for determining acoustic velocity behind casing or tubing in a subterranean wellbore. A method may include obtaining a plurality of waveform data sets corresponding to a plurality of propagation path regimes and obtaining a total wavefield across the receiver array. The method may also include determining a Green's function representing each of the plurality of propagation path regimes and determining a noise wavefield by convolving the Green's functions and a known transmitted pressure signal corresponding to the plurality of waveform data sets. The method may also include generating a reduced-noise wavefield by subtracting the noise wavefield from the total wavefield and estimating the acoustic velocity of a formation behind the casing or tubing from the reduce-noise wavefield.Type: ApplicationFiled: August 30, 2019Publication date: August 25, 2022Applicant: HALLIBURTON ENERGY SERVICES, INC.Inventors: Kristoffer Thomas WALKER, John Philip GRANVILLE, Chung CHANG
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Patent number: 11353616Abstract: Acoustic waves are obtained from an acoustic logging tool within a borehole passing through a formation. Signal properties in a time domain, frequency domain, or both are determined based on the obtained acoustic waves. A machine learning analysis is used to determine formation slowness based on the determined signal properties and a downhole operational parameter is adjusted based on the determined formation slowness.Type: GrantFiled: October 9, 2018Date of Patent: June 7, 2022Assignee: HALLIBURTON ENERGY SERVICES, INC.Inventors: Ruijia Wang, Richard Timothy Coates, Kristoffer Thomas Walker
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Patent number: 11313219Abstract: A method and system for measuring a compressional and a shear slowness. The method may comprise disposing a downhole tool into a wellbore. The downhole tool may comprise a transmitter, wherein the transmitter is a monopole, and a receiver, wherein the receiver is a monopole receiver. The method may further comprise broadcasting the sonic waveform into the formation penetrated by the wellbore, recording a reflected wave on one or more receivers, wherein the reflected wave is a compressional wave or a shear wave, processing the reflected wave into at least one measurement, and applying a validation scheme to the at least one measurement. The system may be a downhole tool comprising a transmitter configured to transmit a sonic waveform into a formation, wherein the transmitter is a monopole, and a receiver configured to record a reflected wave, wherein the receiver is a monopole receiver.Type: GrantFiled: December 20, 2018Date of Patent: April 26, 2022Assignee: Halliburton Energy Services, Inc.Inventor: Kristoffer Thomas Walker
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Publication number: 20220050220Abstract: A method for borehole measurements may comprise receiving one or more signals from a linear receiver array, computing an arctan of a Hilbert Transform, isolating a first arriving energy, selecting a reference instantaneous phase on a reference receiver, finding the reference instantaneous phase for the linear receiver array, computing a relative travel time shift, combining a reference pick time with a relative time, and determining a travel time. A system for borehole measurements comprise a conveyance, a bottom hole assembly attached to the conveyance, a linear receiver array, wherein the linear receiver array is disposed on the bottom hole assembly, and a computer system connected to the linear receiver array.Type: ApplicationFiled: October 29, 2021Publication date: February 17, 2022Applicant: Halliburton Energy Services, Inc.Inventor: Kristoffer Thomas Walker
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Patent number: 11209565Abstract: Disclosed are systems and methods for high precision acoustic logging processing for compressional and shear slowness. The method comprises measuring, by a sonic logging tool, sonic data associated with a formation within a borehole, attempting a detection of a first arrival within the sonic data determining whether the attempted detection of the first arrival is accurate, and in response to an accurate detection of the first arrival determining a travel time of the first arrival, generating a coherence map including the first arrival, and determining, based on the coherence map, a characteristic of the formation.Type: GrantFiled: March 28, 2017Date of Patent: December 28, 2021Assignee: HALLIBURTON ENERGY SERVICES, INC.Inventors: Ruijia Wang, Chung Chang, Kristoffer Thomas Walker, Baichun Sun
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Patent number: 11194069Abstract: A method for borehole measurements may comprise receiving one or more signals from a linear receiver array, computing an arctan of a Hilbert Transform, isolating a first arriving energy, selecting a reference instantaneous phase on a reference receiver, finding the reference instantaneous phase for the linear receiver array, computing a relative travel time shift, combining a reference pick time with a relative time, and determining a travel time. A system for borehole measurements comprise a conveyance, a bottom hole assembly attached to the conveyance, a linear receiver array, wherein the linear receiver array is disposed on the bottom hole assembly, and a computer system connected to the linear receiver array.Type: GrantFiled: November 29, 2018Date of Patent: December 7, 2021Assignee: Halliburton Energy Services, Inc.Inventor: Kristoffer Thomas Walker
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Publication number: 20210356616Abstract: A method is disclosed for radiaiiy profiling shear velocities of flexural wave modes in a formation. The method includes establishing sensitivity kernels with two non-dimensionalized parameters and using said sensitivity kernels to perform an inversion for radial shear wave velocity profiles. This method may be used for LWD, MWD, or wireline logging operations.Type: ApplicationFiled: December 31, 2018Publication date: November 18, 2021Inventors: Yunfei Yang, Kristoffer Thomas Walker
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Publication number: 20210325558Abstract: Acoustic waves are obtained from an acoustic logging tool within a borehole passing through a formation. Signal properties in a time domain, frequency domain, or both are determined based on the obtained acoustic waves. A machine learning analysis is used to determine formation slowness based on the determined signal properties and a downhole operational parameter is adjusted based on the determined formation slowness.Type: ApplicationFiled: October 9, 2018Publication date: October 21, 2021Applicant: HALLIBURTON ENERGY SERVICES, INC.Inventors: Ruijia WANG, Richard Timothy COATES, Kristoffer Thomas WALKER
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Publication number: 20210148217Abstract: A method and system for measuring a compressional and a shear slowness. The method may comprise disposing a downhole tool into a wellbore. The downhole tool may comprise a transmitter, wherein the transmitter is a monopole, and a receiver, wherein the receiver is a monopole receiver. The method may further comprise broadcasting the sonic waveform into the formation penetrated by the wellbore, recording a reflected wave on one or more receivers, wherein the reflected wave is a compressional wave or a shear wave, processing the reflected wave into at least one measurement, and applying a validation scheme to the at least one measurement. The system may be a downhole tool comprising a transmitter configured to transmit a sonic waveform into a formation, wherein the transmitter is a monopole, and a receiver configured to record a reflected wave, wherein the receiver is a monopole receiver.Type: ApplicationFiled: December 20, 2018Publication date: May 20, 2021Applicant: Halliburton Energy Services, Inc.Inventor: Kristoffer Thomas Walker
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Publication number: 20200319362Abstract: A method and system for azimuthal direction detection of a cable. The method may comprise disposing an electromagnetic logging tool into a wellbore, transmitting a primary electromagnetic field from the one or more transmitters, recording one or more secondary electromagnetic fields at the one or more receivers, and identifying a direction to the cable from the one or more secondary electromagnetic fields. The system may comprise one or more transmitters disposed on the electromagnetic logging tool and configured to transmit a primary electromagnetic field. The system may further comprise one or more receivers disposed on the electromagnetic logging tool and configured to record one or more secondary electromagnetic fields. Additionally, the system may further comprise an information handling system configured to identify a direction to an azimuthally localized reduction in metal of the conductor or increase in the metal of the conductor from the secondary electromagnetic fields.Type: ApplicationFiled: January 30, 2020Publication date: October 8, 2020Applicant: Halliburton Energy Services, Inc.Inventors: Baris Guner, Kristoffer Thomas Walker, Ahmed Elsayed Fouda, Stuart Michael Wood
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Publication number: 20200032644Abstract: In distributed fiber-optic sensing within a borehole, the accuracy of correlating signal channels with depth along the borehole can be improved by taking the thermo-optic effect on the group velocity of light into account. In an example application, this allows, in turn, to more accurately localize acoustic sources via distributed acoustic sensing. Additional embodiments are disclosed.Type: ApplicationFiled: November 17, 2016Publication date: January 30, 2020Inventors: Hua Xia, Kristoffer Thomas Walker, David Andrew Barfoot, Yinghui Lu
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Publication number: 20200033493Abstract: A method for borehole measurements may comprise receiving one or more signals from a linear receiver array, computing an arctan of a Hilbert Transform, isolating a first arriving energy, selecting a reference instantaneous phase on a reference receiver, finding the reference instantaneous phase for the linear receiver array, computing a relative travel time shift, combining a reference pick time with a relative time, and determining a travel time. A system for borehole measurements comprise a conveyance, a bottom hole assembly attached to the conveyance, a linear receiver array, wherein the linear receiver array is disposed on the bottom hole assembly, and a computer system connected to the linear receiver array.Type: ApplicationFiled: November 29, 2018Publication date: January 30, 2020Applicant: Halliburton Energy Services, Inc.Inventor: Kristoffer Thomas Walker
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Patent number: 10459102Abstract: Disclosed herein is an approach to processing the waveforms measured by a plurality of receivers in a manner that improves signal-detection performance for multiple simultaneously occurring signals, despite disparate signal and noise levels, by applying an waveform pre-processing scheme prior to computing a semblance map therefrom.Type: GrantFiled: January 29, 2016Date of Patent: October 29, 2019Assignee: Halliburton Energy Services, Inc.Inventor: Kristoffer Thomas Walker
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Patent number: 10459101Abstract: Systems and methods for downhole signal filtering. A method for downhole signal filtering may comprise defining outliers as isolated values; providing thresholds; determining the outliers from a buffer; computing a difference in slowness between adjacent pairs of values; comparing the adjacent pairs of values to other values in a same window; determining if the adjacent pairs of values vary more than the threshold; assigning a 2D flag array a value of 0 if the adjacent pairs of values vary more than the threshold; and computing a 75% percentile distribution for each adjacent pair of values to determine if each adjacent pair of values are the outliers.Type: GrantFiled: May 12, 2017Date of Patent: October 29, 2019Assignee: Halliburton Energy Services, Inc.Inventor: Kristoffer Thomas Walker
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Patent number: 10444391Abstract: An example method includes at least partially positioning within a wellbore an optical fiber of a distributed acoustic sensing (DAS) data collection system. Seismic data from the DAS data collection system may be received. The seismic data may include seismic traces associated with a plurality of depths in the wellbore. A quality factor may be determined for each seismic trace. One or more seismic traces may be removed from the seismic data based, at least in part, on the determined quality factors.Type: GrantFiled: August 13, 2015Date of Patent: October 15, 2019Assignee: Halliburton Energy Services, Inc.Inventors: Andreas Ellmauthaler, Mark Elliott Willis, David Andrew Barfoot, Kristoffer Thomas Walker
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Publication number: 20190219718Abstract: Methods for well logging may comprise recording a pressure wave at a dipole receiver, processing the pressure wave with a Fourier transform, computing a frequency semblance from the Fourier transform, computing an adaptive weighting function, and estimating a shear wave slowness. A method for well logging may further comprise disposing a downhole tool into a borehole, activating the dipole transmitter, sensing the pressure wave with the dipole receiver, recording the pressure wave, processing the pressure wave with a Fourier transform, computing a frequency semblance from the Fourier transform, and estimating a shear wave slowness. Estimating shear wave slowness may comprise producing one or more adaptive weights, a combination of a coherence map, and a dispersion curve. Estimating shear wave slowness may further comprise preparing an acoustic well log from the adaptive weights, the combination of the coherence map, and the dispersion curve.Type: ApplicationFiled: October 26, 2016Publication date: July 18, 2019Applicant: Halliburton Energy Services, Inc.Inventors: Mark Vincent Collins, Kristoffer Thomas Walker
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Publication number: 20190086571Abstract: A method to measure borehole Stoneley wave slowness and its associated tool-corrected dispersion curve. The method for measuring borehole Stoneley wave slowness may comprise gathering waveforms, conditioning waveforms, identifying slowness constraints, computing a time-slowness mask, computing a coherence map from differential phase time semblance, processing a two-dimensional time-slowness map, determining slownesses from a one-dimensional variable density log, and tracking time pick from a two-dimensional map. The method may further comprise identifying one or more of coherence, power, instantaneous frequency, signal-to-noise ratio, or error bars from the two-dimensional time-slowness map. The method may further computing a spline interpolation locally around the pick from the one-dimensional variable density log to produce a final data product.Type: ApplicationFiled: May 11, 2017Publication date: March 21, 2019Applicant: Halliburton Energy Services, Inc.Inventor: Kristoffer Thomas Walker
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Patent number: 10209384Abstract: Disclosed herein is an approach to improving the accuracy of signal-peak tracking in acoustic logs by supplementing a semblance method used to detect signal peaks in individual coherence-, correlation- or amplitude-based semblance maps with consistency checks based on rock-physics constraints and/or based on history and/or future data for the signal of interest.Type: GrantFiled: January 29, 2016Date of Patent: February 19, 2019Assignee: Halliburton Energy Services, Inc.Inventors: Grant Philip Goodyear, Kristoffer Thomas Walker, Batakrishna Mandal