Matches 1 - 50 out of 195 1 2 3 4 >


Match Document Document Title
9043153 Maximum depth of investigation of measurements in a formation  
The present disclosure relates to a method to determine a volume of clearance surrounding a wellbore. A logging tool is provided. The logging tool may be disposed on a wireline, a drill string, or...
8957683 High frequency dielectric measurement tool  
Disclosed dielectric logging tools and methods employ three or more receive horn antennas positioned between at least two transmit antennas, which can also be horn antennas. The logging tools can...
8952700 Method for minimizing delays while drilling using a magnetic ranging apparatus  
A method and system is provided for minimizing delays in a magnetic ranging method. Delays are minimized by establishing synchronicity between triggering of a three-axis magnetometer and...
8947094 At-bit magnetic ranging and surveying  
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...
8922387 Tapered thread EM gap sub self-aligning means and method  
A generally three-part EM gap sub comprising a first conductive cylinder incorporating a male tapered threaded section, a second conductive cylinder incorporating female tapered threaded section,...
8917094 Method and apparatus for detecting deep conductive pipe  
Downhole tools and techniques acquire information regarding nearby conductors such as pipes, well casing, and conductive formations. At least some method embodiments provide a current flow along a...
8860417 Downhole activation system using magnets and method thereof  
A downhole activation system within a tubular. The system includes an axially movable mover. A first magnet attached to the mover. The first magnet axially movable with the mover. A second magnet...
8847600 Use of autotransformer-like antennas for downhole applications  
An apparatus for estimating a property of an earth formation penetrated by a borehole, apparatus including: a carrier configured to be conveyed through the borehole; a transducer disposed at the...
8829907 Frequency filtering and adjustment of electromagnetically received signals from antennas  
An apparatus for estimating a property of an earth formation penetrated by a borehole, the apparatus having: a carrier configured to be conveyed through the borehole; a transmitter disposed at the...
8829909 Reservoir navigation using magnetic field of DC currents  
A method and apparatus for steering a drilling assembly within a reservoir of an earth formation is disclosed. The drilling assembly is positioned within the reservoir between a conductive upper...
8810247 Electromagnetic orientation system for deep wells  
An electromagnetic method and apparatus for determining the azimuthal orientation of a drill bit instrumentation sub (70), with respect to a borehole bottom drilling assembly (150) includes an...
8756016 Method and system to estimate fracture aperture in horizontal wells  
A method for estimating a fracture aperture in a formation penetrated by a well includes obtaining at least one of a vertical resistivity (Rv) and a horizontal resistivity (Rh) of the formation;...
8749242 System and method for employing alternating regions of magnetic and non-magnetic casing in magnetic ranging applications  
A system and methods for facilitating drilling and/or drilling a well in an orientation with respect to an existing well are provided. Specifically, one method in accordance with present...
8749243 Real time determination of casing location and distance with tilted antenna measurement  
Methods and apparatus for detecting nearby conductors such as pipes, well casing, etc., from within a borehole. A nearby casing string can be detected by transmitting an electromagnetic signal...
8646520 Precision marking of subsurface locations  
A method for performing a downhole operation includes marking at least one location in a wellbore using a magnetized material. The magnetized material may generate a magnetic field stronger than a...
8638103 Electromagnetic logging between borehole and surface  
The present disclosure relates to determining a property, such as resistivity, of an earth formation. A transmitter is disposed in a wellbore penetrating the formation, and a plurality of...
8633702 Apparatus and method for actively balancing impedance of a resistivity measuring tool  
An apparatus for making a resistivity measurement of an underground formation surrounding a borehole is provided. The apparatus includes a conductive tool body, at least one current injector...
8618803 Well location determination apparatus, methods, and systems  
In some embodiments, apparatus and systems, as well as methods, may operate to launch a set of currents into a corresponding set of existing well casings; monitor, in a well under construction,...
8604796 Steerable magnetic dipole antenna for measurement-while-drilling applications  
A steerable or non-steerable, magnetic dipole antenna for Measurement-While-Drilling (MWD) or Logging-While-Drilling (LWD) applications. The antenna elements use a hole arrangement in addition to...
8593140 Formation testing and evaluation using localized injection  
Evaluating a formation by lowering a downhole tool in a wellbore penetrating the formation, injecting a fluid into the formation at an injection zone via the downhole tool, and using a formation...
8567449 Systems and methods for locating and restoring service lines in pipeline rehabilitation  
Embodiments of the present invention include a system for locating and restoring service lines during pipeline restoration. According to some embodiments of the present invention, the system...
8497685 Angular position sensor for a downhole tool  
Aspects of this invention include a downhole tool having an angular position sensor disposed to measure the relative angular position between first and second members disposed to rotate about a...
8490717 Downhole magnetic measurement while rotating and methods of use  
Downhole magnetic measurement devices and methods are provided for estimation of magnetic fields during drilling. In certain embodiments, a triaxial vector magnetometer is provided and affixed to...
8487626 Downhole sensor assembly and method of using same  
A sensor assembly for sensing downhole parameters is provided. The sensor assembly is positionable in a downhole tool deployable into a subterranean formation to form a wellbore. The sensor...
8471563 Steerable magnetic dipole antenna for measurement while drilling applications  
A steerable, magnetic dipole antenna for Measurement-While-Drilling (MWD) or Logging-While-Drilling (LWD) applications. The antenna elements use a hole arrangement in addition to grooves in a...
8471562 Multi-axial antenna and method for use in downhole tools  
Embodiments of a multi-axial antenna system and system for measuring subsurface formations are generally described herein. Other embodiments may be described and claimed. In some embodiments, the...
8473211 Methods of correcting accelerometer and magnetometer measurements  
A method of correcting accelerometer and magnetometer measurements made in a well is provided. The method includes making a series of triaxial measurements with magnetometers and accelerometers in...
8456166 Single-well through casing induction logging tool  
Methods and related systems are described for making electromagnetic measurements of a subterranean rock formation through a conductive casing of a borehole. A number of transmitters/receivers are...
8362781 Method for eliminating borehole eccentricity effect in transversal induction sensor  
An instrument for measuring a property of a subsurface material, the instrument including: a magnetic material surrounding a volume in at least two dimensions; and a receiver adapted for receiving...
8362782 Resonance method for measuring water-oil ratio, conductivity, porosity, permeability and electrokinetic constant in porous formations  
A shear wave is generated at a borehole wall. A static magnetic field is applied with a radial direction and an oscillating magnetic field is applied tangential to the borehole wall. The frequency...
8294468 Method and apparatus for well-bore proximity measurement while drilling  
A rotating, transversely magnetized, magnet on a drill collar induces magnetization in a casing of a preexisting well. A coil rotating synchronously with the magnet produces a current at twice the...
8289024 Method and apparatus for locating well casings from an adjacent wellbore  
A wellbore tool for locating a target wellbore containing a conductive member from a second wellbore and directing the trajectory of the second wellbore relative to the target wellbore includes an...
8278928 Apparatus and method for detection of position of a component in an earth formation  
An apparatus for detecting a position of a component in an earth formation is disclosed. The apparatus includes: a transmitter configured to emit a first magnetic field into the earth formation...
8269501 Methods for magnetic imaging of geological structures  
Methods for imaging geological structures include injecting magnetic materials into the geological structures, placing at least one magnetic probe in a proximity to the geological structures,...
8264229 Electromagnetic geological metrology system  
An electromagnetic geological metrology system comprises: (a) a transmitter arrangement for generating outbound radiation towards a geological formation;(b) a receiver arrangement for receiving...
8180571 Wellbore surveying  
This invention relates to surveying wellbores. In particular this invention provides methods of correcting magnetic surveys for the effects introduced by magnetic mud. The method of the present...
8072347 Method and apparatus for locating faults in wired drill pipe  
A method for determining electrical condition of a wired drill pipe includes inducing an electromagnetic field in at least one joint of wired drill pipe. Voltages induced by electrical current...
8063641 Magnetic ranging and controlled earth borehole drilling  
A method for determining the distance and/or direction of a second earth borehole with respect to a first earth borehole, includes the following steps: providing, in the first borehole, first and...
8026722 Method of magnetizing casing string tubulars for enhanced passive ranging  
A method for magnetizing a wellbore tubular includes magnetizing the tubular at three or more discrete locations on the tubular. In exemplary embodiments the magnetized wellbore tubular includes...
8008919 Method for compensating drill pipe and near-borehole effect on and electronic noise in transient resistivity measurements  
Transient measurements made at two spaced apart receivers responsive to separate activation of two transmitters symmetrically disposed about the two receivers. The transmitters and receivers are...
7990153 Compensated directional resistivity measurements  
A method for making directional resistivity measurements includes sequentially transmitting first and second axial and transverse electromagnetic waves in a borehole and receiving substantially...
7969150 Demagnetizer to eliminate residual magnetization of wellbore wall produced by nuclear magnetic resonance logs  
An apparatus and method is disclosed for measuring a parameter of an earth formation surrounding a wellbore. A Nuclear Magnetic Resonance (NMR) tool and at least one second tool are conveyed in...
7958949 Method and apparatus for three dimensional geosteering  
A technique for drilling a borehole includes obtaining data from a tool in the borehole for a plurality of positions in the borehole that is being drilled to form acquired data indicative of...
7822562 Removing air wave noise from electromagnetic survey data  
Method for removing air wave noise from shallow water controlled source electromagnetic survey data, using only the measured data and conductivity values for sea water (140) and air. The method is...
7816923 Enhanced passive ranging methodology for well twinning  
A method for drilling substantially parallel twin wells includes drilling a first well and deploying a casing string in the first well. A magnetized section of the casing string includes a...
7816922 Magnetization of target well casing string tubulars for enhanced passive ranging  
A method for magnetizing a wellbore tubular is disclosed. The method includes magnetizing a wellbore tubular at three or more discrete locations on the tubular. In exemplary embodiments the...
7812610 Method and apparatus for locating well casings from an adjacent wellbore  
A wellbore tool for locating a target wellbore containing a conductive member from a second wellbore and directing the trajectory of the second wellbore relative to the target wellbore includes an...
7768275 Method and apparatus for characterising a three phase transformer using a single phase power supply  
A method and apparatus for characterizing a three phase transformer (3) using a single phase power supply (1). Pairs of input terminals (H0-H3) of the transformer are sequentially energized for...
7759942 Lightweight, low cost structure for formation conductivity measuring instrument  
A well logging instruments includes an electrically conductive sonde mandrel. At least one electrical sensor is affixed to an exterior of the mandrel. The sensor is configured to be attached to...
7679480 Method for magnetizing casing string tubulars  
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...

Matches 1 - 50 out of 195 1 2 3 4 >