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Class 324/362 - To measure induced polarization


Subclass of Class 324 - Electricity: measuring and testing
Definition: Subject matter adapted to determine the polarization effects
No. of patents: 22
Last issue date: 03/20/2012


NumberTitleIssue Date
8138763Method for quantitative separation of electromagnetic induction and induced polarization effects
The invention relates to the field of electrical exploration and to the methods of determination of subterranean formations properties by means of electric parameters of subterranean formations measuring and separating of the parameters measured. The invention can b...
03/20/2012
7239154Soil penetrating electrode with conical taper
This disclosure describes a Soil Penetrating Electrode with Conical Taper for use with instrumentation for measurement of the electrical properties of soil in situ. The Electrode shape and configuration solves problems of stable and reliable contact with the soil, r...
07/03/2007
7104147System and method for measuring electric current in a pipeline
A system and method for measuring a voltage differential in a current-carrying pipe using a propulsion vehicle. The system may be adapted for use with a pipeline pig or other propulsion device, which is configured to determine the electric current in a pipeline with...
09/12/2006
6674286Methods and apparatus for measuring electrical properties of a ground using a graphite electrode
Methods and apparatuses for measuring an electrical property of the ground. The apparatus includes a graphite electrode. The graphite electrode includes a graphite body and a first and second opening. The first opening extends longitudinally throughout th...
01/06/2004
6404203Methods and apparatus for measuring electrical properties of a ground using an electrode configurable as a transmitter or receiver
An apparatus for measuring induced polarization of the ground. The apparatus includes a polarizable contact member configured to transmit a current to the ground. An electrode includes a first conductor and a second conductor. The first conductor is coupl...
06/11/2002
6008645Prediction of permeability from capillary pressure curves derived from nuclear magnetic resonance pore size distributions
Capillary pressure curves can be derived from nuclear magnetic resonance (NMR) pore size distributions. These derived capillary pressure curves can be used to derive the displacement pressure, the fractional bulk volume of mercury at infinite pressure and...
12/28/1999
4875015Multi-array borehole resistivity and induced polarization method with mathematical inversion of redundant data
Multiple arrays of electric or magnetic transmitters and receivers are used in a borehole geophysical procedure to obtain a multiplicity of redundant data suitable for processing into a resistivity or induced polarization model of a subsurface region of t...
10/17/1989
4812766Telluric noise cancellation in induced polarization prospecting
An improved method and apparatus for detecting telluric noise information while performing induced polarization prospecting. Telluric noise electrodes are positioned on an equipotential line lying about an input current electrode forming part of a convent...
03/14/1989
4769606Induced polarization method and apparatus for distinguishing dispersed and laminated clay in earth formations
Logging means and methods are disclosed for distinguishing between dispersed and laminated clay in earth formations. A wireline apparatus is employed consisting of a multifrequency induced polarization logging tool operating at extremely low frequencies, ...
09/06/1988
4743854In-situ induced polarization method for determining formation permeability
An in-situ method of determining the pore size distribution, capillary pressure curve, and permeability of a formation using induced polarization logging measurements. The induced polarization (IP) voltage decay curve is measured opposite the formation of...
05/10/1988
4730162Time-domain induced polarization logging method and apparatus with gated amplification level
The stimulus signal for an induced polarization logging system is presented to the formation intermittently, alternately being applied and removed as a square wave of alternating polarity, and the response signal amplification level is time gated with the...
03/08/1988
4644283In-situ method for determining pore size distribution, capillary pressure and permeability
An in-situ method of determining the pore size distribution, capillary pressure curve, and permeability of a formation using induced polarization logging measurements. The induced polarization (IP) voltage decay curve is measured opposite the formation of...
02/17/1987
4642570Method and apparatus for complex resistivity measurements with elimination of electromagnetic coupling effects
An apparatus includes a logging tool having electrodes for introducing a current into a downhole formation and for detecting a voltage produced in the formation by the current. The current is provided by a transmitter circuit, and the voltage is received ...
02/10/1987
4608954Input circuit for an electronic vehicle speed control unit
An improved input circuit for an electronic vehicle speed control unit is disclosed. An ignition current sensor coil is adapted to have a voltage differential signal induced therein each time an ignition pulse is generated by the vehicle engine. Electrica...
09/02/1986
4467642Method for identifying complex lithologies in a subsurface formation
A method of logging a subsurface formation surrounding a borehole includes the recording of an induced polarization log, the recording of a nuclear log of delayed gamma-rays from the activation of aluminum in the formation, and the recording of a nuclear ...
08/28/1984
4359687Method and apparatus for determining shaliness and oil saturations in earth formations using induced polarization in the frequency domain
An apparatus is disclosed for borehole measurements of the induced polarization of earth formations. The apparatus consists of an induced polarization logger capable of measuring both in-phase and quadrature conductivities in the frequency domain. A metho...
11/16/1982
4339720Telluric noise cancellation in induced polarization prospecting
Apparatus and method for generating a record of telluric noise which is substantially free of induced polarization signals and is suitable for removal of noise components from induced polarization signal records. The apparatus includes a single pair of te...
07/13/1982
4114086Inductive source method of induced polarization prospecting
A method of geophysically prospecting a polarizable medium by measuring induced polarization effects wherein the medium is inductively polarized by a time varying current in an induction coil that varies with respect to time unidirectionally to maintain a...
09/12/1978
4041372Apparatus for multi-channel induced polarization surveying
A method of induced polarization geophysical surveying which derives meaningful parameters relative to the subsurface strata in both time domain and frequency domain for comparison and/or deductive data compilation and graphic depiction. The system includ...
08/09/1977
3984759Apparatus for use in an induced polarization system for measuring the deformation of a periodic signal concealed in noise
An apparatus for measuring the deformation parameters of a periodic signal concealed in noise. The signal is transmitted by a transmitter controlled by a stable clock and received by a receiver also controlled by a stable clock of the same frequency as th...
10/05/1976
3984749Process and arrangement for the operation of rechargeable zinc electrodes
A process for the operation of rechargeable zinc electrodes in galvanic cells with the aid of a residual discharge, which comprises subjecting the rechargeable zinc electrode in a cell after a normal discharge to a residual discharge by connecting with at...
10/05/1976
3967190Method using induced polarization for ore discrimination in disseminated earth deposits
A method for establishing data related to the complex resistivity of selected subsurface earth deposits whereby increased discrimination and identification of ore deposits is established. The method utilizes induced polarization in the earth with establis...
06/29/1976
 
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