173334 ⎘
Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation specially adapted for well-logging operating with propagation of electric current using dc
Apparatus and method for measuring thickness of tubings in downhole applications
#2Resistivity imaging system with compensator for parasitic impedances between electrodes and their conductive substrates
#3Methods and systems of determining parameters characterizing porous media from data gathered by a plurality of different tools
#4Methods and systems for determining formation properties and pipe properties using ranging measurements
#5Eddy-current responses in nested pipes
#6Ranging and resistivity evaluation using current signals
#7RANGING TO AN ELECTROMAGNETIC TARGET WITHOUT TIMING
#8Method and apparatus for monitoring an underground object
#9Time-lapse time-domain reflectometry for tubing and formation monitoring
#10System and method to improve accuracy of galvanic tool measurements
#11Accounting for bending effect in deep azimuthal resistivity measurements using inversion
#12Misalignment compensation for deep reading azimuthal propagation resistivity
#13Electrolocation apparatus and methods for providing information about one or more subterranean feature
#14Apparatus and methods for providing information about one or more subterranean feature
#15Directional resistivity measurement for well placement and formation evaluation
#16METHOD FOR DETERMINATION OF THE OIL FORMATION WATER-FLOODING AREA PATTERN AND SIZE IN THE WELLBORE ZONE
#17Electrolocation apparatus and methods for mapping from a subterranean well
#18Method and apparatus for determining formation resistivity ahead of the bit and azimuthal at the bit
#19Thermodynamic housing for a geophysical data acquisition system and method of use
#20Subsurface data transfer using well fluids