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Class Information
Number: 324/376
Name: Electricity: measuring and testing > Of subsurface core sample
Description: Subject matter relating to the analysis by electrical means of core samples which have been removed from the subsurface of the earth.

Sub-classes under this class:

Class Number Class Name Patents
324/377 For magnetic properties 14

Patents under this class:
1 2

Patent Number Title Of Patent Date Issued
8653841 Method and apparatus for monitoring a high-voltage electrical circuit including a discharge circuit Feb. 18, 2014
8598883 Measuring device of the electric properties of solid or liquid geological samples Dec. 3, 2013
8461843 Method and system for measuring resistivity anisotropy of layered rock samples Jun. 11, 2013
8061442 Method to detect formation pore pressure from resistivity measurements ahead of the bit during drilling of a well Nov. 22, 2011
8056623 Surface formation monitoring system and method Nov. 15, 2011
8024960 Method and device for evaluating flow parameters and electric parameters of porous medium Sep. 27, 2011
7844405 Static and ultrasonic methods for measuring compressibility and density of small particles Nov. 30, 2010
7798214 Subsurface formation monitoring system and method Sep. 21, 2010
7642785 Method and device for complex permittivity measurements as a function of frequency Jan. 5, 2010
7472588 Petrophysical fluid flow property determination Jan. 6, 2009
7453266 Electronic humidity chamber for vapor desorption to determine high capillary pressures Nov. 18, 2008
7319332 Method for determining of the formation factor for a subterranean deposit from measurements on drilling waste removed therefrom Jan. 15, 2008
7221165 Method and device for measuring the resistivity anisotropy of layered rock samples May. 22, 2007
6788066 Method and apparatus for measuring resistivity and dielectric in a well core in a measurement while drilling tool Sep. 7, 2004
6380745 Electrical geophysical apparatus for determining the density of porous materials and establishing geo-electric constants of porous material Apr. 30, 2002
6229312 Method and device for fast measurement of the resistivity index of solid samples such as rocks May. 8, 2001
6178807 Method for laboratory measurement of capillary pressure in reservoir rock Jan. 30, 2001
6166546 Method for determining the relative clay content of well core Dec. 26, 2000
6147497 Using electrical impedance tomography to map subsurface hydraulic conductivity Nov. 14, 2000
5923171 Determining a parameter on a component in a composition Jul. 13, 1999
5832409 Automated gas permeameter Nov. 3, 1998
5610524 Device for petrophysical measurement and implementation method Mar. 11, 1997
5503001 Determination of permeability of porous media and thickness of layered porous media Apr. 2, 1996
5493226 Method and apparatus for measuring properties of core samples including heating and pressurizing the core sample and measuring the dynamic and static capillary pressure of water in the core sa Feb. 20, 1996
5341101 Method and apparatus utilizing ionizing and microwave radiation for saturation determination of water, oil and a gas in a core sample Aug. 23, 1994
5239267 Method for improving the accuracy of dip determination using adjustable high pass filters Aug. 24, 1993
5209104 Method for desaturating a porous rock for electrical resistivity measurements May. 11, 1993
5164672 Method for measuring electrical resistivity of a core sample of porous rock during water drainage and imbibition Nov. 17, 1992
5105154 Apparatus for measuring radial resistivities in cylindrical core samples of porous rock Apr. 14, 1992
5095273 Method for determining tensor conductivity components of a transversely isotropic core sample of a subterranean formation Mar. 10, 1992
5093623 Method for determining electrical anisotrophy from radial resistivities in cylindrical core samples of porous rock Mar. 3, 1992
5059907 Method for evaluating the water saturation of subterranean formations from dielectric permittivity measurements Oct. 22, 1991
5010301 Method for determining the swelling clay content of cement mixtures by dielectric measurements Apr. 23, 1991
4996489 Laboratory technique for measuring complex dielectric constant of rock core samples Feb. 26, 1991
4982604 Method and system for testing the dynamic interaction of coring fluid with earth material Jan. 8, 1991
4979393 Process for rapidly determining the solids content in drilling fluids Dec. 25, 1990
4926128 Method for utilizing measured resistivities of porous rock under differing fluid saturations to identify fluid distribution equilibrium May. 15, 1990
4924187 Method for measuring electrical anisotrophy of a core sample from a subterranean formation May. 8, 1990
4907442 Method and system for determining fluid saturations within natural or simulated fractures Mar. 13, 1990
4907448 Apparatus for measuring resistivity of porous rock Mar. 13, 1990
4903207 Method for determining reservoir bulk volume of hydrocarbons from reservoir porosity and distance to oil-water contact level Feb. 20, 1990
4876512 Method for rapidly determining the swelling-clay content in shales and shaly sandstone formations by high-frequency dielectric constant measurements Oct. 24, 1989
4786873 Method for evaluating water saturation in petroleum reservoirs from dielectric permittivity Nov. 22, 1988
4769606 Induced polarization method and apparatus for distinguishing dispersed and laminated clay in earth formations Sep. 6, 1988
4752882 Method for determining the effective water saturation in a low-resistivity hydrocarbon-bearing rock formation based upon rock matrix conductance Jun. 21, 1988
4751646 Method for determining original saturations in a produced field Jun. 14, 1988
4734649 Apparatus for measuring the resistivity of a sample Mar. 29, 1988
4686477 Multiple frequency electric excitation method and identifying complex lithologies of subsurface formations Aug. 11, 1987
4646000 Method and apparatus for measuring soil salinity Feb. 24, 1987
4644283 In-situ method for determining pore size distribution, capillary pressure and permeability Feb. 17, 1987

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