<p>Various embodiments include apparatus and methods to make resistivity measurements in a borehole using tool having an array of electrodes operable to provide focused currents and measure corresponding voltages to determine resistivity. Tools can be configured with a main electrode having a number of spaced apart electrodes within the main electrode such that the spaced apart electrodes are arranged azimuthally with respect to an axis of the tool. Generation of current from the spaced apart electrodes and control of current from additional electrodes on each side of the main electrode can provide for focused measurements. Additional apparatus, systems, and methods are disclosed.</p>
申请公布号
WO2013103337(A1)
申请公布日期
2013.07.11
申请号
WO2012US20082
申请日期
2012.01.03
申请人
HALLIBURTON ENERGY SERVICES, INC.;SHANJUN, LI;BITTAR, MICHAEL S.