Patents by Inventor John F. Hunka
John F. Hunka 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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Patent number: 7812608Abstract: An electromagnetic logging tool is disclosed that includes a support; and at least one four-coil array disposed on the support, wherein the at least one four-coil array comprises: a transmitter, a bucking coil, a receiver, and a trim coil. A method for balancing an induction array is disclosed that includes applying an alternating current to a transmitter of the induction array that comprises the transmitter, a bucking coil and a receiver; measuring a mutual coupling between the transmitter and the receiver; and adding an extra bucking coil, if the mutual coupling exceeds a selected criterion.Type: GrantFiled: September 18, 2009Date of Patent: October 12, 2010Assignee: Schlumberger Technology CorporationInventors: Andrei I. Davydychev, John F. Hunka, Thomas D. Barber, Scott S. Chesser, Bulent Finci, Jingjing Karen Sun, William B. Vandermeer, Richard D. Ward
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Patent number: 7679366Abstract: An electromagnetic logging tool includes a support configured for disposal in a well; at least one antenna mounted on the support; and a plurality of coils mounted on the support proximate the at least one antenna, wherein the plurality of the coils are configured for selective connection with the at least one antenna. A methods for balancing an induction array on an electromagnetic logging tool includes measuring a mutual coupling between a transmitter and a receiver on the electromagnetic logging tool; and selectively connecting a subset of a plurality of coils on the electromagnetic logging tool to the transmitter or the receiver based on the measured mutual coupling.Type: GrantFiled: July 23, 2008Date of Patent: March 16, 2010Assignee: Schlumberger Technology CorporationInventors: Scott S. Chesser, Richard D. Ward, Bulent Finci, Andrei I. Davydychev, William B. Vandermeer, John F. Hunka
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Patent number: 7671597Abstract: A composite encased tool for making subsurface measurements in a borehole traversing a subsurface formation includes a conductive mandrel, a first composite layer wrapped around the conductive mandrel, the first composite layer having one or more slots, a source or sensor disposed in each of the one or more slots, and a second composite layer wrapped around the first composite layer with the source or sensor in the one or more slots.Type: GrantFiled: May 23, 2006Date of Patent: March 2, 2010Assignee: Schlumberger Technology CorporationInventors: Bulent Finci, Scott S. Chesser, Jingjing (Karen) Sun, Denis Lebreton, Richard D. Ward, Andrei I. Davydychev, William B. Vandermeer, John F. Hunka
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Publication number: 20100026280Abstract: An electromagnetic logging tool is disclosed that includes a support; and at least one four-coil array disposed on the support, wherein the at least one four-coil array comprises: a transmitter, a bucking coil, a receiver, and a trim coil. A method for balancing an induction array is disclosed that includes applying an alternating current to a transmitter of the induction array that comprises the transmitter, a bucking coil and a receiver; measuring a mutual coupling between the transmitter and the receiver; and adding an extra bucking coil, if the mutual coupling exceeds a selected criterion.Type: ApplicationFiled: September 18, 2009Publication date: February 4, 2010Applicant: Schlumberger Technology CorporationInventors: Andrei I. Davydychev, John F. Hunka, Thomas D. Barber, Scott S. Chesser, Bulent Finci, Jingling Karen Sun, William B. Vandermeer, Richard D. Ward
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Patent number: 7501829Abstract: An electromagnetic logging that includes a support; and at least one four-coil array disposed on the support, wherein the at least one four-coil array comprises: a transmitter, a bucking coil, a receiver, and a trim coil. A method for balancing an induction array includes applying an alternating current to a transmitter of the induction array that comprises the transmitter, a bucking coil and a receiver; measuring a mutual coupling between the transmitter and the receiver; and adding an extra bucking coil, if the mutual coupling exceeds a selected criterion.Type: GrantFiled: February 16, 2006Date of Patent: March 10, 2009Assignee: Schlumberger Technology CorporationInventors: Andrei I. Davydychev, John F. Hunka, Thomas D. Barber, Scott S. Chesser, Bulent Finci, Jingjing (Karen) Sun, William B. Vandermeer, Richard D. Ward
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Publication number: 20080278147Abstract: An electromagnetic logging tool is disclosed that includes a support; and at least one four-coil array disposed on the support, wherein the at least one four-coil array comprises: a transmitter, a bucking coil, a receiver, and a trim coil. A method for balancing an induction array is disclosed that includes applying an alternating current to a transmitter of the induction array that comprises the transmitter, a bucking coil and a receiver; measuring a mutual coupling between the transmitter and the receiver; and adding an extra bucking coil, if the mutual coupling exceeds a selected criterion.Type: ApplicationFiled: July 30, 2008Publication date: November 13, 2008Applicant: Schlumberger Technology CorporationInventors: Andrei I. Davydychev, John F. Hunka, Thomas D. Barber, Scott S. Chesser, Bulent Finci, Jingjing Karen Sun, William B. Vandermeer, Richard D. Ward
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Publication number: 20080278170Abstract: An electromagnetic logging tool includes a support configured for disposal in a well; at least one antenna mounted on the support; and a plurality of coils mounted on the support proximate the at least one antenna, wherein the plurality of the coils are configured for selective connection with the at least one antenna. A methods for balancing an induction array on an electromagnetic logging tool includes measuring a mutual coupling between a transmitter and a receiver on the electromagnetic logging tool; and selectively connecting a subset of a plurality of coils on the electromagnetic logging tool to the transmitter or the receiver based on the measured mutual coupling.Type: ApplicationFiled: July 23, 2008Publication date: November 13, 2008Applicant: Schlumberger Technology CorporationInventors: Scott S. Chesser, Richard D. Ward, Bulent Finci, Andrei I. Davydychev, William B. Vandermeer, John F. Hunka
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Patent number: 7417436Abstract: An electromagnetic logging tool includes a support configured for disposal in a well; at least one antenna mounted on the support; and a plurality of coils mounted on the support proximate the at least one antenna, wherein the plurality of the coils are configured for selective connection with the at least one antenna. A method for balancing an induction array on an electromagnetic logging tool includes measuring a mutual coupling between a transmitter and a receiver on the electromagnetic logging tool; and selectively connecting a subset of a plurality of coils on the electromagnetic logging tool to the transmitter or the receiver based on the measured mutual coupling.Type: GrantFiled: February 16, 2006Date of Patent: August 26, 2008Assignee: Schlumberger Technology CorporationInventors: Scott S. Chesser, Richard D. Ward, Bulent Finci, Andrei I. Davydychev, William B. Vandermeer, John F. Hunka
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Patent number: 4873488Abstract: Induction logging sonde including transmitter and receiver solenoid coils mounted on a support and axially separated from each other. The support is made of conductive material and comprises at least one first longitudinal portion for mounting the coils and second longitudinal portions on each side of the first portion. At least the first portion has a substantially continuous and axisymmetric outer surface so as to favor the flow of eddy currents around the surface, whereby the electric field on that surface is substantially cancelled.Type: GrantFiled: November 18, 1986Date of Patent: October 10, 1989Assignee: Schlumberger Technology CorporationInventors: Thomas D. Barber, Richard N. Chandler, John F. Hunka
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Patent number: 4651101Abstract: Induction logging sonde including transmitter and receiver solenoid coils mounted on a support and axially separated from each other. The support is made of conductive material and comprises at least one first longitudinal portion for mounting the coils and second longitudinal portions on each side of the first portion. At least the first portion has a substantially continuous and axisymmetric outer surface so as to favor the flow of eddy currents around the surface, whereby the electric field on that surface is substantially cancelled.Type: GrantFiled: April 3, 1985Date of Patent: March 17, 1987Assignee: Schlumberger Technology CorporationInventors: Thomas D. Barber, Richard N. Chandler, John F. Hunka