| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 166660500 | Magnetic | 24 |
| 20080264624 | Downhole Sensor Assembly - In one aspect of the invention, a sensor assembly for incorporation into a downhole tool string comprises at least one sensor adapted to detect changes in magnetic flux proximate a first portion of the downhole tool string. A second portion of the downhole tool string comprises a characteristic that interferes with a magnetic reading of the at least one sensor. At least one magnetic focusing array is disposed on an outer diameter of the tool string, and the at least one magnetic focusing array reduces an effect on the sensor of the interfering characteristic of the second portion. | 10-30-2008 |
| 20090211748 | Device for Conducting Cementing Operations and Inflow Regulation - The present invention relates to a cementing or inflow regulation valve for conducting cementing operations or inflow regulation in a wellbore comprising a casing or tubing ( | 08-27-2009 |
| 20100186945 | MAGNET FIXING DEVICE IN A CLEANING TOOL - A magnet fixing device in a cleaning tool ( | 07-29-2010 |
| 20100243232 | Magnetic Slip Retention for Downhole Tool - A downhole tool, such as a packer or liner hanger, has a mandrel on which slips are disposed for engaging a surrounding tubular downhole. When the tool is being run in or out of the hole, at least one magnetic component magnetically retains the slip adjacent the mandrel so the slip can be held away from the surrounding tubular. When the tool is set downhole, the initial magnetic retention can be broken, and the slips can be moved away from the mandrel to engage the surface of the surrounding tubular. | 09-30-2010 |
| 20110088890 | MULTIPLE MAGNETIC SENSOR RANGING METHOD AND SYSTEM - A system and methods for drilling a well in an orientation with respect to an existing well are provided. Specifically, one method in accordance with present embodiments includes producing a magnetic field with a magnetic field source positioned in the first well, producing a first output from a first magnetic field sensor subsystem for sensing directional magnetic field components, and producing a second output from a second magnetic field sensor subsystem for sensing directional magnetic field components. The first and second magnetic field sensor subsystems are positioned a distance apart from one another within the second well. Further, the first and second outputs are responsive to the magnetic field produced by the magnetic field source. | 04-21-2011 |
| 20110139434 | Method and Apparatus for Demagnetizing a Borehole - A demagnetizing sub having an electromagnet or a rotating magnet is used for demagnetizing magnetized material in a wellbore. By gradually reducing the magnetic field, the magnetized material within the borehole is demagnetized. | 06-16-2011 |
| 20110284203 | Downhole Magnetic Retrieval Devices with Fixed Magnetic Arrays - A magnetic retrieval tool used for collecting metallic debris and material from within a wellbore or other surrounding downhole tubular. The tool includes a tool mandrel with one or more pockets formed in its outer radial surface. A removable insert resides within each pocket. Each of the inserts retains a plurality of individual magnets in a fixed array or matrix surrounding the mandrel. | 11-24-2011 |
| 20120043070 | Magnetic Slip Retention for Downhole Tool - A downhole tool, such as a packer or liner hanger, has a mandrel on which slips are disposed for engaging a surrounding tubular downhole. When the tool is being run in or out of the hole, at least one magnetic component magnetically retains the slip adjacent the mandrel so the slip can be held away from the surrounding tubular. When the tool is set downhole, the initial magnetic retention can be broken, and the slips can be moved away from the mandrel to engage the surface of the surrounding tubular. | 02-23-2012 |
| 20120125597 | ECCENTRIC SAFETY VALVE - A safety valve for use in a subterranean well can include a housing assembly having a flow passage extending longitudinally through the housing assembly. An outer diameter of the housing assembly is eccentric relative to the flow passage. A well tool can include a magnetic coupling between magnet devices. One magnet device includes a series of magnets which are unequally spaced circumferentially about the other magnet device. Another safety valve can include a longitudinally extending flow passage, a closure device which selectively permits and prevents flow through the flow passage, and an outer diameter which is eccentric relative to the flow passage. | 05-24-2012 |
| 20120168146 | HIGH PRESSURE HIGH TEMPERATURE (HPHT) WELL TOOL CONTROL SYSTEM AND METHOD - Methods and apparatus are disclosed. The problems of damage and failure of solenoid valves in high pressure high temperature environments and the problem of difficult repair of solenoid valves are addressed through reduction of the possibility of damage to the ball seat and/or seals and through a modular design to increase the ease of repair and adjustment in the event repair is needed. | 07-05-2012 |
| 20120234530 | Remote Subterranean Tool Activation System - An actuation tool uses a lock that when released allows a moving magnet to move into position to repel another magnet. The repelling force on the second magnet moves it away from a locking position on a stored potential energy system where the release of the potential energy creates kinetic energy to drive an actuation assembly to set the tool. In a preferred application the tool can be a liner hanger. The release device can be a selectively energized electromagnet or a solenoid that shifts at least one magnet into alignment with at least one second magnet so as to defeat the second magnet from effectively storing the potential energy that can set the tool when the lock is defeated. | 09-20-2012 |
| 20120273187 | Detecting a Reamer Position through a Magnet Field Sensor - In one aspect of the present invention, a tool string component comprises at least one end that attaches to an adjacent component in a through bore. The invention also comprises a laterally extending member disposed along a length of the tool string component. A magnetic mechanism is configured to sense an extension depth of the laterally extending member. | 11-01-2012 |
| 20130000884 | DOWNHOLE TOOL AND METHOD - A cleaning tool ( | 01-03-2013 |
| 20130020066 | APPARATUS AND METHOD FOR TREATING A SUBTERRANEAN FORMATION USING DIVERSION - Apparatus and method comprising a plurality of particles which are magnetically attracted to one another in response to exposure to a magnetic field, and which maintain attraction to one another after removal of the magnetic field, the attraction being disabled when the particles are demagnetized, whereby the particles operate to alter the rheological properties of a fluid in which the particles are mixed when the attraction is enabled or disabled is disclosed. | 01-24-2013 |
| 20130333872 | Magnetic Field Downhole Tool Attachment - A magnetic attachment mechanism for use with a downhole tool comprises a plurality of permanent magnets each having a magnetic field, a demagnetizer configured to at least partially cancel one or more magnetic fields in an activated state, an actuator configured to transition the demagnetizer between the activated state and a deactivated state or the deactivated state and the activated state, and at least one downhole tool coupled to the plurality of permanent magnets. | 12-19-2013 |
| 20140020887 | ECCENTRIC SAFETY VALVE - A safety valve for use in a subterranean well can include a housing assembly having a flow passage extending longitudinally through the housing assembly. An outer diameter of the housing assembly is eccentric relative to the flow passage. A well tool can include a magnetic coupling between magnet devices. One magnet device includes a series of magnets which are unequally spaced circumferentially about the other magnet device. Another safety valve can include a longitudinally extending flow passage, a closure device which selectively permits and prevents flow through the flow passage, and an outer diameter which is eccentric relative to the flow passage. | 01-23-2014 |
| 20140060803 | Magnetic Key for Operating a Multi-Position Downhole Tool - A downhole tool for use in a wellbore tubular string comprises a housing having a bore therethrough forming part of a fluid flowpath through the wellbore tubular string, a sliding member operable to slide with respect to the housing, a plurality of magnetic pins, and a corresponding plurality of springs. A sliding line is formed by interfacing surfaces of the sliding member and the housing, and the plurality of pins comprise a locked position and an unlocked position whereby in the locked position at least one pin spans the sliding line to prevent the sliding member from sliding with respect to the housing and in the unlocked position no pins span the sliding line. The plurality of springs biases the pins towards the locked position. | 03-06-2014 |
| 20140151019 | Magnetic Key for Operating a Multi-Position Downhole Tool - A downhole tool for use in a wellbore tubular string comprises a housing having a bore therethrough forming part of a fluid flowpath through the wellbore tubular string, a sliding member operable to slide with respect to the housing, a plurality of magnetic pins, and a corresponding plurality of springs. A sliding line is formed by interfacing surfaces of the sliding member and the housing, and the plurality of pins comprise a locked position and an unlocked position whereby in the locked position at least one pin spans the sliding line to prevent the sliding member from sliding with respect to the housing and in the unlocked position no pins span the sliding line. The plurality of springs biases the pins towards the locked position. | 06-05-2014 |
| 20140251592 | ROTATING MAGNETIC FIELD DOWNHOLE POWER GENERATION DEVICE - The present disclosure relates to a downhole rotating magnetic field generator, wherein a stator assembly is formed by fixedly connecting a guiding stator, windings, and a body together, and a rotor assembly is formed by mounting a turbine rotor and a permanent magnet together. Between the stator assembly and the rotor assembly, sliding bearings are arranged and small mud passages are formed. There is no metal isolation between the rotor and the stator for cutting through the magnetic lines of force, so that the eddy current loss is relatively small. Meanwhile, with mud flowing through the passages as lubricant, overheating of the generator can be prevented and high power output can be ensured. | 09-11-2014 |
| 20140374085 | Apparatus and Methods for Testing Inductively Coupled Downhole Systems - Apparatus and methods for testing inductively coupled downhole systems are described. An example inductive coupler assembly for use in a wellbore includes an inductive coupler fixed to a completion in the wellbore, a drill pipe, a portion of which is to be located adjacent to the inductive coupler, and a sleeve surrounding the portion of the drill pipe to reduce a reluctance of a magnetic circuit including the inductive coupler. | 12-25-2014 |
| 20150034294 | Submersible Electrical Machine and Method - A submersible electrical machine includes a first magnetic package spaced axially from a second magnetic package, a first stator displaced axially from the first magnetic package by a first air gap, a second stator displaced axially from the second magnetic package by a second air gap. The electrical machine can be operated as a generator or as a motor. When operating as a generator, a turbine can rotate the magnetic packages relative to the stators in response to fluid flowing axially across the electrical machine. | 02-05-2015 |
| 20150047824 | Multi-stage Locking System for Selective Release of a Potential Energy Force to Set a Subterranean Tool - An actuation tool uses a lock that when released allows a moving magnet to move into position to repel another magnet. Alternatively a magnetic field can be triggered in a stationary magnet such as one delivered on wireline, for example, to accomplish tool actuation. The repelling force on the second magnet moves it away from a locking position to allow another lock to retract and release the stored potential energy, where the release of the potential energy creates kinetic energy to drive an actuation assembly to set the tool. In a preferred application the tool can be a liner hanger. The release device can be a selectively energized electromagnet or a solenoid that shifts at least one magnet into alignment with at least one second magnet so as to defeat the second magnet from effectively supporting dogs that retain the potential energy whose movement can set the tool. | 02-19-2015 |
| 20150122480 | MAGNETIC RETRIEVAL APPARATUS - A downhole retrieval tool includes a mandrel; an inner sleeve disposed around the mandrel; a plurality of magnets coupled to the inner sleeve; and an outer sleeve disposed around the plurality of magnets, wherein the inner sleeve and the plurality of magnets are rotatable relative to the mandrel. In another aspect, an assembly tool for handling a magnet includes an anchor; a conveyance movable relative to the anchor; and a magnet holder coupled to the conveyance, wherein the magnet holder includes an arm for retaining the magnet. | 05-07-2015 |
| 20160168957 | Magnetic Field Disruption For In-Well Power Conversion | 06-16-2016 |
