EPR systems for flow assurance and logging

Proppant having non-uniform electrically conductive coatings and methods for making and using same

Downhole gradiometric ranging utilizing transmitters and receivers having magnetic dipoles

Rotational wellbore ranging

Reducing or preventing dissipation of electrical current and associated magnetic signal in a wellbore

Downhole measurement and survey tools with conformable sensors

Hydraulic fracture permeability characterization from electromagnetic measurements

Earth surveying for improved drilling applications

Downhole multi-pipe scale and corrosion detection using conformable sensors

Method to predict local geomagnetic disturbance field and its practical application

Compensated borehole and pipe survey tool with conformable sensors

Compensated deep propagation measurements with differential rotation

Fiber optic based magnetic sensing apparatus, systems, and methods

Apparatus and methods for making azimuthal resistivity measurements

Gain compensated symmetrized and anti-symmetrized angles

Compensated deep measurements using a tilted antenna

Ranging measurements using modulated signals

Well ranging apparatus, methods, and systems

Method of determining CEC and other properties from multi-frequency dielectric measurements

Well completion with single wire guidance system

Pipe and borehole imaging tool with multi-component conformable sensors

Systems and methods for removal of electromagnetic dispersion and attenuation for imaging of proppant in an induced fracture

Ranging measurement apparatus, methods, and systems

Well ranging apparatus, methods, and systems

Method and Apparatus for Magnetic Ranging While Rotating

Low-noise fluxgate magnetometer with increased operating temperature range

Devices and methods for measuring analyte concentration

Magnetic location determination in a wellbore

Calibration resistivity tools in environments with radio-frequency noise

Hydrophobic Paramagnetic Nanoparticles as Intelligent Crude Oil Tracers

Method for monitoring a flood front

Multi-electrode electric field downhole logging tool

Sensors, tools and systems containing a metallic foam and elastomer composite

Devices and methods for detecting chemicals

Time-lapse time-domain reflectometry for tubing and formation monitoring

Deep azimuthal system with multi-pole sensors

Electromagnetic assessment of multiple conductive tubulars

Dual mode balancing in OBM resistivity imaging

Time-frequency domain multiplexing apparatus, methods, and systems

Determining seismic sensor orientation in a wellbore

Systems and methods for performing ranging measurements using third well referencing

Real-time, limited orientation sensor auto-calibration

Use of a fractal antenna in array dielectric logging

Deep formation evaluation systems and methods

System for drilling parallel wells for SAGD applications

Formation imaging with multi-pole antennas

Apparatus and methods to find a position in an underground formation

Systems and methods for look ahead resistivity measurement with offset well information

Method and system of determining characteristics of a formation

Apparatus and method for downhole resistivity measurements

Reducing conductive casing effect in transient cased-hole resistivity logging

Fracture sensing system and method

Electromagnetic logging while drilling tool

Method for making downhole electromagnetic logging while drilling measurements

Mapping and monitoring of hydraulic fractures using vector magnetometers

Gradient-based single well ranging system for SAGD application

Polymer coated nanoparticles

Method and device for measuring a magnetic field

Systems and methods for locating and imaging proppant in an induced fracture

Systems and methods for locating and imaging proppant in an induced fracture

Toroidal link for RPM measurement

Drilling system and electromagnetic telemetry tool with an electrical connector assembly and associated methods

System, method and computer-program product for in-situ calibration of a wellbore resistivity logging tool

Transient electromagnetic tool mounted on reduced conductivity tubular

Method and device for downhole corrosion and erosion monitoring

Methods for producing a log of material properties

System and method to induce an electromagnetic field within the earth

WELL RANGING TOOL AND METHOD

SYSTEM AND METHOD FOR A DOWNHOLE LOGGING TOOL WITH AN ARRAY OF PAIRED RECEIVER ANTENNAS

EM processing using field ratios

Reliable wired-pipe data transmission system

Dual mode balancing in OBM resistivity imaging

System and method to measure or generate currentless electrical field downhole

Detecting Hydrocarbons in a Geological Structure

Induction type broadband 3-component borehole magnetic measuring sensor and borehole electromagnetic tomography method using the same

FLUID EXCLUDER FOR LOGGING IN WATER BASED MUDS

Method for estimating subsurface properties from geophysical survey data using physics-based inversion

Downhole gradiometric ranging for T-intersection and well avoidance utilizing transmitters and receivers having magnetic dipoles

Methods and devices for extra-deep azimuthal resistivity measurements

Systems and methods of robust determination of boundaries

Combination power source for a magnetic ranging system

Apparatus and methods of skin effect correction

Term by term gain calibration of triaxial propagation measurements

Downhole surveying

Method for locating casing downhole using offset XY magnetometers

Look ahead logging system

Methods and systems for obtaining an electrical impedivity and/or resistivity image of a subterranean formation

Downhole seismic sensor with filler fluid and method of using same

Methods and systems for joint seismic and electromagnetic data recording

Systems and methods for downhole electric field measurement

Systems and methods for downhole electromagnetic field measurement

Efficiency of pixel-based inversion algorithms

Enhanced resistivity measurement with at-bit resistivity sensor

Electroacoustic method of conductivity measurement through casing

Use of metamaterial to enhance measurement of dielectric properties

Bucking circuit for annulling a magnetic field

Method of determination of fracture extent

METHOD AND SYSTEM FOR MONITORING SUBSURFACE INJECTION PROCESSES USING A BOREHOLE ELECTROMAGNETIC SOURCE

Feedthrough assembly for well-logging tool

Look-ahead of the bit applications

Estimating adsorbed gas volume from NMR and dielectric logs

Interferometric processing to detect subterranean geological boundaries

Electronic time stamping apparatus as a part of a system for use with an inground transmitter

Induced polarization mapping with borehole to surface electromagnetic transmitter data

Induced polarization logging with borehole to surface electromagnetic transmitter

Basalt fiber composite for antenna in well-logging

Positioning method and tool for determining the position of the tool in a casing downhole

Optical interferometric sensors for measuring electromagnetic fields

WELL MONITORING WITH OPTICAL ELECTROMAGNETIC SENSORS

Passive magnetic ranging for SAGD and relief wells via a linearized trailing window kalman filter

System for tracking a downhole tool assembly using dual above-ground receiver assemblies

Apparatus and methods for well-bore proximity measurement while drilling

Methods and systems for analyzing formation properties when performing subterranean operations

Electromagnetic method for obtaining dip azimuth angle

Systems and methods for ranging while drilling

Open-Hole Logging Instrument And Method For Making Ultra-Deep Magnetic And Resistivity Measurements

Magnetic field sensing tool with magnetic flux concentrating blocks

Apparatus and method for measuring electrical properties of an underground formation

System and method for measuring downhole parameters

Downhole surveying utilizing multiple measurements

Induction logging signals and directional guidance antenna systems

Induction logging signals using complex waveforms and directional guidance antenna systems

Electrolocation apparatus and methods for providing information about one or more subterranean feature

Method and apparatus to detect a conductive body

Method and apparatus for in-situ wellbore measurement and control with inductive connectivity

Method of measuring parameters of a porous medium using nanoparticle injection

At-bit magnetic ranging and surveying

Formation resistivity measurements using multiple controlled modes

Method and apparatus for detecting plunger arrival

METHODS FOR MAGNETIC IMAGING OF GEOLOGICAL STRUCTURES

Apparatus and method for multi-component wellbore electric field Measurements using capacitive sensors

Electronic time stamping apparatus for use with an inground transmitter

Real-time casing detection using tilted and crossed antenna measurement

Borehole to surface electromagnetic transmitter

Resonance method for measuring the electroacoustic constant and permeability of rock formations

LOGGING TOOL

Reliable wired-pipe data transmission system

Well location determination apparatus, methods, and systems

Reservoir navigation using magnetic field of DC currents

Marine Source To Borehole Electromagnetic Mapping Of Sub-Bottom Electrical Resistivity

Downhole surveying utilizing multiple measurements

METHOD AND APPARATUS FOR ESTIMATING VISCOSITY AND DENSITY DOWNHOLE USING A RELAXED VIBRATING ELECTRICALLY CONDUCTIVE ELEMENT

Method and apparatus for directional well logging

Methods of electromagnetic migration imaging of geologic formation

Fluid flow sensor

Method for time lapsed reservoir monitoring using azimuthally sensitive resistivity measurements while drilling

SLOTTED SHIELD FOR LOGGING-WHILE-DRILLING TOOL

Method and apparatus for detecting deep conductive pipe

Method for determining spatial distribution of fluid injected into subsurface rock formations

Real time determination of casing location and distance with tilted antenna measurement

Method for calibrating current and magnetic fields across a drill collar

Systems and methods for well positioning using a transverse rotating magnetic source

Resistivity Measurement Through Metal Casing Using Magnetic Field and Magnetoacoustic Phenomena

Single well reservoir imaging apparatus and methods

Method for timestamping boring tool locations

Method of studying rock mass properties and apparatus for the implementation thereof

Analyzing toolface velocity to detect detrimental vibration during drilling

Method and apparatus for demagnetizing a borehole

Look ahead logging system

Current-to-voltage converters with dynamic feedback

Resonance method for measuring water-oil ratio, conductivity, porosity, permeability and electrokinetic constant in porous formations

Methods for producing a log of material properties

Method and apparatus for locating well casings from an adjacent wellbore

Downhole magnetic measurement while rotating and methods of use

Electromagnetic logging in time domain with use of specific current pulses

Resistivity Measurement Through Metal Casing Using Magnetic Field and Magnetoacoustic Phenomena

Controlled source fracture monitoring

In situ recovery from a hydrocarbon containing formation

Downhole surveying utilizing multiple measurements

Determining formation wettability from dielectric measurements

Electrical power supply arrangement for a downhole measurement assembly

Methods for magnetic imaging of geological structures

Method and apparatus for optimizing magnetic signals and detecting casing and resistivity

Method for establishing a portion of a boring tool path

Method and apparatus of using crossed magnetic fields for measuring conductivity, permeability and porosity

Method and apparatus for optimizing magnetic signals and detecting casing and resistivity

System and method implementing inherently conducting polymers for downhole applications

Method of characterizing hydrocarbon reservoir fractures in situ with artificially enhanced magnetic anisotropy

Downhole sensor assembly

Resistivity measurement through metal casing using magnetic field and magnetoacoustic phenomena

Magnetic ranging while drilling parallel wells

Method and an apparatus for evaluating a geometry of a hydraulic fracture in a rock formation

In situ recovery from a hydrocarbon containing formation

Method and apparatus for locating well casings from an adjacent wellbore

Method and apparatus for rock sample analysis using magnetic susceptibility

Enhanced sonde recognition

Method for determining properties of earth formations using dielectric permittivity measurements

Technique for determining properties of earth formations using dielectric permittivity measurements

Electrical power supply arrangement for a downhole measurement assembly

Method and apparatus for demagnetizing a borehole

Boring technique using locate point measurements for boring tool depth prediction

Boring technique using locate point measurements for boring tool depth prediction

Antenna core material for use in MWD resistivity measurements and NMR measurements

Magnetometers for measurement-while-drilling applications

Determination of borehole geometry inside cased wells with crosswell electromagnetics

In situ thermal processing of a hydrocarbon containing formation using a natural distributed combustor

Evaluation of fracture geometries in rock formations

Borehole-to-surface near-source transient electromagnetic high-precision exploration method

Orientation determination and calibration of electromagnetic resistivity tools

Dynamic diameter measurement device for downhole wireline cables

Dual-mode casing collar locator (CCL) tool, mode selection circuit and method