Patents by Inventor Leon Ceh
Leon Ceh 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: 20160245072Abstract: Methods for determining a distance from a drilling well to a magnetized target well include acquiring magnetic field measurements from the drilling well. The acquired magnetic field measurements are made at a plurality of spaced apart locations in the drilling well. The acquired magnetic field measurements are processed to obtain a ratio including at least one of the following: (i) a ratio of a magnetic field intensity to a first spatial derivative of a magnetic field, (ii) a ratio of a magnetic field intensity to a second spatial derivative of a magnetic field, and (iii) a ratio of a first spatial derivative of a magnetic field to a second spatial derivative of the magnetic field. The ratio (or ratios) is then processed to obtain the distance from the drilling well to the magnetized target well.Type: ApplicationFiled: October 23, 2014Publication date: August 25, 2016Applicant: Schlumberger Technology CorporationInventors: Andrew G. Brooks, Graham A. McElhinney, Leon Ceh, Kenneth Stenerson
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Patent number: 9297249Abstract: Methods for improving wellbore survey accuracy and placement are disclosed. The Earth's magnetic field may be measured at a magnetically clean surface location and correlated with a non-magnetic reference direction to obtain a direction of the Earth's field (e.g., a magnetic declination or a magnetic inclination). The direction of the Earth's magnetic field may in turn be processed in combination with magnetic measurements made in a subterranean borehole to obtain one or more survey parameters.Type: GrantFiled: June 20, 2012Date of Patent: March 29, 2016Inventors: Graham A. McElhinney, Leon Ceh, Euan Forbes, Kenneth Stenerson
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Patent number: 8947094Abstract: A bottom hole assembly configured for a subterranean drilling operation having a drill bit; a downhole tool deployed above the drill bit, at least a portion of the downhole tool free to rotate with respect to the drill bit about a longitudinal axis of the bottom hole assembly a sensor sub deployed axially between the drill bit and the downhole tool, the sensor sub configured to rotate with the drill bit about the longitudinal axis of the bottom hole assembly and free to rotate with respect to the downhole tool about the longitudinal axis and a tri-axial magnetic field sensor deployed in the sensor sub.Type: GrantFiled: July 5, 2012Date of Patent: February 3, 2015Assignee: Schlumber Technology CorporationInventors: Graham A. McElhinney, Leon Ceh, Kenneth Stenerson, Euan Forbes
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Publication number: 20130069655Abstract: A bottom hole assembly configured for a subterranean drilling operation having a drill bit; a downhole tool deployed above the drill bit, at least a portion of the downhole tool free to rotate with respect to the drill bit about a longitudinal axis of the bottom hole assembly a sensor sub deployed axially between the drill bit and the downhole tool, the sensor sub configured to rotate with the drill bit about the longitudinal axis of the bottom hole assembly and free to rotate with respect to the downhole tool about the longitudinal axis and a tri-axial magnetic field sensor deployed in the sensor sub.Type: ApplicationFiled: July 5, 2012Publication date: March 21, 2013Inventors: Graham A. McElhinney, Leon Ceh, Kenneth Stenerson, Euan Forbes
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Publication number: 20130002257Abstract: Methods for improving wellbore survey accuracy and placement are disclosed. The Earth's magnetic field may be measured at a magnetically clean surface location and correlated with a non-magnetic reference direction to obtain a direction of the Earth's field (e.g., a magnetic declination or a magnetic inclination). The direction of the Earth's magnetic field may in turn be processed in combination with magnetic measurements made in a subterranean borehole to obtain one or more survey parameters.Type: ApplicationFiled: June 20, 2012Publication date: January 3, 2013Inventors: Graham A. McElhinney, Leon Ceh, Euan Forbes, Kenneth Stenerson
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Patent number: 7712519Abstract: A method and apparatus for imparting a transverse magnetization to a wellbore tubular is disclosed. In certain exemplary embodiments, tubulars are magnetized to include at least one flux reversal (e.g., at the center of the tubular) at which the direction of the transverse field changes (i.e., from pointing radially inward to pointing radially outward). A plurality of such magnetized wellbore tubulars may be coupled together and lowered into a target well to form a magnetized section of a casing string. Exemplary embodiments of the invention may be utilized to impart a strong, highly uniform magnetic field about a string of wellbore tubulars, thereby providing for improved passive ranging and wellbore twinning.Type: GrantFiled: August 25, 2006Date of Patent: May 11, 2010Assignee: Smith International, Inc.Inventors: Graham McElhinney, Leon Ceh
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Patent number: 7679480Abstract: A method for magnetizing a wellbore tubular includes a positioning a wellbore tubular substantially coaxially in a plurality of longitudinally spaced magnetizing coils deployed on a frame. The coils are selectively connected and disconnected from electrical power such that a circumferential electrical current flows in each of the coils to impart a predetermined magnetic field pattern to the tubular. Exemplary embodiments of this invention provide for semi-automated control of tubular magnetization and thereby enable a repeatable magnetic pattern to be imparted to each of a large number of wellbore tubulars.Type: GrantFiled: April 13, 2009Date of Patent: March 16, 2010Assignee: Smith International, Inc.Inventors: Kenneth Stenerson, Leon Ceh, Graham A. McElhinney
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Patent number: 7679481Abstract: A stack of magnetized casing tubulars includes a plurality of magnetized wellbore tubulars each of which includes a plurality of north and south magnetic poles imparted to a corresponding plurality of longitudinal positions along the tubulars. The plurality of wellbore tubulars are arranged into a stack having at least two rows and at least two columns, the wellbore tubulars are stacked side by side and atop one another such that the magnetic poles on one tubular are radially aligned with magnetic poles of an opposite polarity on adjacent tubulars. Such a configuration advantageously substantially eliminates weakening of the imparted magnetic field due to interaction of the magnetic poles on adjacent tubulars.Type: GrantFiled: April 13, 2009Date of Patent: March 16, 2010Assignee: Smith International, Inc.Inventors: Kenneth Stenerson, Leon Ceh, Graham A. McElhinney
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Publication number: 20090195340Abstract: A method for magnetizing a wellbore tubular includes a positioning a wellbore tubular substantially coaxially in a plurality of longitudinally spaced magnetizing coils deployed on a frame. The coils are selectively connected and disconnected from electrical power such that a circumferential electrical current flows in each of the coils to impart a predetermined magnetic field pattern to the tubular. Exemplary embodiments of this invention provide for semi-automated control of tubular magnetization and thereby enable a repeatable magnetic pattern to be imparted to each of a large number of wellbore tubulars.Type: ApplicationFiled: April 13, 2009Publication date: August 6, 2009Applicant: SMITH INTERNATIONAL, INC.Inventors: Kenneth Stenerson, Leon Ceh, Graham A. McElhinney
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Publication number: 20090195339Abstract: A stack of magnetized casing tubulars includes a plurality of magnetized wellbore tubulars each of which includes a plurality of north and south magnetic poles imparted to a corresponding plurality of longitudinal positions along the tubulars. The plurality of wellbore tubulars are arranged into a stack having at least two rows and at least two columns, the wellbore tubulars are stacked side by side and atop one another such that the magnetic poles on one tubular are radially aligned with magnetic poles of an opposite polarity on adjacent tubulars. Such a configuration advantageously substantially eliminates weakening of the imparted magnetic field due to interaction of the magnetic poles on adjacent tubulars.Type: ApplicationFiled: April 13, 2009Publication date: August 6, 2009Applicant: SMITH INTERNATIONAL, INC.Inventors: Kenneth Stenerson, Leon Ceh, Graham McElhinney
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Publication number: 20090173504Abstract: A method and apparatus for imparting a transverse magnetization to a wellbore tubular is disclosed. In certain exemplary embodiments, tubulars are magnetized to include at least one flux reversal (e.g., at the center of the tubular) at which the direction of the transverse field changes (i.e., from pointing radially inward to pointing radially outward). A plurality of such magnetized wellbore tubulars may be coupled together and lowered into a target well to form a magnetized section of a casing string. Exemplary embodiments of the invention may be utilized to impart a strong, highly uniform magnetic field about a string of wellbore tubulars, thereby providing for improved passive ranging and wellbore twinning.Type: ApplicationFiled: August 25, 2006Publication date: July 9, 2009Applicant: PathFinder Energy Services, Inc.Inventors: Graham McElhinney, Leon Ceh
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Patent number: 7538650Abstract: An apparatus for magnetizing a wellbore tubular includes a plurality of co-axial magnetizing coils deployed on a frame. The coils are typically deployed about a track on which the tubular may be traversed. Exemplary embodiments may further include a magnetic field sensor disposed to measure the imparted magnetic field along the length of the tubular as it is removed from the track after magnetization. Exemplary embodiments of this invention provide for semi-automated control of tubular magnetization and thereby enable a repeatable magnetic pattern to be imparted to each of a large number of wellbore tubulars.Type: GrantFiled: July 17, 2006Date of Patent: May 26, 2009Assignee: Smith International, Inc.Inventors: Kenneth Stenerson, Leon Ceh, Graham McElhinney
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Publication number: 20080012672Abstract: An apparatus for magnetizing a wellbore tubular includes a plurality of co-axial magnetizing coils deployed on a frame. The coils are typically deployed about a track on which the tubular may be traversed. Exemplary embodiments may further include a magnetic field sensor disposed to measure the imparted magnetic field along the length of the tubular as it is removed from the track after magnetization. Exemplary embodiments of this invention provide for semi-automated control of tubular magnetization and thereby enable a repeatable magnetic pattern to be imparted to each of a large number of wellbore tubulars.Type: ApplicationFiled: July 17, 2006Publication date: January 17, 2008Applicant: PathFinder Energy Services, Inc.Inventors: Kenneth Stenerson, Leon Ceh, Graham McElhinney