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Class Information
Number: 324/324
Name: Electricity: measuring and testing > Of geophysical surface or subsurface in situ > Including borehole fluid investigation
Description: Subject matter relating to the determination of an electrical property of the fluid in a well, borehole, or other opening in the earth.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7482811 |
Magneto-optical method and apparatus for determining properties of reservoir fluids |
Jan. 27, 2009 |
| 7453265 |
Device for monitoring of oil-water interface |
Nov. 18, 2008 |
| 7420373 |
Magnetic head for conductivity imaging for use in boreholes |
Sep. 2, 2008 |
| 7327146 |
Probe for measuring the electromagnetic properties of a down-hole material |
Feb. 5, 2008 |
| 7243718 |
Methods for locating formation fractures and monitoring well completion using streaming potential transients information |
Jul. 17, 2007 |
| 7235970 |
Antenna core material for use in MWD resistivity measurements and NMR measurements |
Jun. 26, 2007 |
| 7091722 |
Method and apparatus for measuring mud resistivity |
Aug. 15, 2006 |
| 7002363 |
Method and system for compensating thermally induced motion of probe cards |
Feb. 21, 2006 |
| 6956381 |
Flexible probe for measuring moisture content in soil |
Oct. 18, 2005 |
| 6911822 |
Methods and devices for analysis of sealed containers |
Jun. 28, 2005 |
| 6905241 |
Determination of virgin formation temperature |
Jun. 14, 2005 |
| 6894478 |
Fault indicator with automatically configured trip settings |
May. 17, 2005 |
| 6888341 |
Dual voltage circuit tester |
May. 3, 2005 |
| 6831462 |
Floor cover and MR system |
Dec. 14, 2004 |
| 6803756 |
Wafer probe station |
Oct. 12, 2004 |
| 6801039 |
Apparatus and method for measuring mud resistivity using a defocused electrode system |
Oct. 5, 2004 |
| 6769805 |
Method of using a heater with a fiber optic string in a wellbore |
Aug. 3, 2004 |
| 6707289 |
Method and apparatus for automatic registration for a board |
Mar. 16, 2004 |
| 6441618 |
Method and apparatus for monitoring the advance of seawater into fresh water aquifers near coastal cities |
Aug. 27, 2002 |
| 6369575 |
Methods and apparatuses for measuring the resistivity of drilling mud in a borehole |
Apr. 9, 2002 |
| 6263729 |
Method of determining the hydrocarbon flow rate in a multi-phase fluid flowing in an oil well |
Jul. 24, 2001 |
| 6046593 |
Method/apparatus for measuring mud resistivity using a focused-electrode system |
Apr. 4, 2000 |
| 6002257 |
Method and apparatus for well bore hole-finding with simultaneous borehole or formation sensing |
Dec. 14, 1999 |
| 5963037 |
Method for generating a flow profile of a wellbore using resistivity logs |
Oct. 5, 1999 |
| 5926024 |
System and method for measuring fluid properties by forming a coaxial transmission line in a cased well |
Jul. 20, 1999 |
| 5677631 |
Coaxial two port waveguide flowline sensor |
Oct. 14, 1997 |
| 5661237 |
Method and apparatus for locally measuring flow parameters of a multiphase fluid |
Aug. 26, 1997 |
| 5659135 |
Method for modeling a stratified and fractured geologic environment |
Aug. 19, 1997 |
| 5656767 |
Automatic determination of moisture content and lubricant type |
Aug. 12, 1997 |
| 5644076 |
Wireline formation tester supercharge correction method |
Jul. 1, 1997 |
| 5625348 |
Method and apparatus for detecting local precursor seismic activity |
Apr. 29, 1997 |
| 5625138 |
Earthquake early warning system |
Apr. 29, 1997 |
| 5574371 |
Method and apparatus for measuring mud resistivity in a wellbore including a probe having a bottom electrode for propagating a current from and to the bottom electrode in a direction approxima |
Nov. 12, 1996 |
| 5561245 |
Method for determining flow regime in multiphase fluid flow in a wellbore |
Oct. 1, 1996 |
| 5453693 |
Logging system for measuring dielectric properties of fluids in a cased well using multiple mini-wave guides |
Sep. 26, 1995 |
| 5428848 |
Flush regulator |
Jul. 4, 1995 |
| 5408862 |
Earthquake early warning system |
Apr. 25, 1995 |
| 5405479 |
Automatic valve insertion method |
Apr. 11, 1995 |
| 5383122 |
Method for analyzing pressure buildup in low pumping rate wells |
Jan. 17, 1995 |
| 5341100 |
Electromagnetic wave method and apparatus for downhole measurement of fluid conductivity and hydrocarbon volume during formation testing |
Aug. 23, 1994 |
| 4975645 |
Impedance cross correlation logging tool for two phase flow measurement |
Dec. 4, 1990 |
| 4962665 |
Sampling resistivity of formation fluids in a well bore |
Oct. 16, 1990 |
| 4733232 |
Method and apparatus for borehole fluid influx detection |
Mar. 22, 1988 |
| 4733233 |
Method and apparatus for borehole fluid influx detection |
Mar. 22, 1988 |
| 4724434 |
Method and apparatus using casing for combined transmission of data up a well and fluid flow in a geological formation in the well |
Feb. 9, 1988 |
| 4536713 |
Electrical resistivity measurement of a flowing drilling fluid using eddy currents generated therein |
Aug. 20, 1985 |
| 4502121 |
Machine method for determining the presence and location of hydrocarbon deposits within a subsurface earth formation |
Feb. 26, 1985 |
| 4314338 |
Method of generating subsurface characteristic models |
Feb. 2, 1982 |
| 4253063 |
Impedance measuring method of and apparatus for detecting escaping leach solution |
Feb. 24, 1981 |
| 4233839 |
Apparatus and method for determining characteristics of subsurface formations |
Nov. 18, 1980 |
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