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    • 9. 发明申请
    • Method and apparatus for borehole wall resisitivity imaging with full circumferential coverage
    • 具有全周期覆盖的井壁电阻成像方法和装置
    • US20100097068A1
    • 2010-04-22
    • US12288171
    • 2008-10-17
    • Gregory B. ItskovichAlexandre N. BespalovFarhat A. ShaikhPeter John Nolan
    • Gregory B. ItskovichAlexandre N. BespalovFarhat A. ShaikhPeter John Nolan
    • G01V3/20
    • G01V3/20
    • A logging tool for performing resistivity measurements on the sidewall of a borehole in an earth formation is provided with a circumferential series of evenly-spaced measurement electrodes providing complete circumferential coverage of resistivity measurements. In one embodiment, the measurement electrodes are carried on a conductive pad circumferentially surrounding an elongate mandrel or tubular. The conductive pad is held at a voltage adapted to focus measurement current into the sidewall of the borehole. Preferably, the pad has dimensions relative to the measurement electrodes and a standoff distance between the measurement electrodes and said borehole wall to effectively focus the measurement current into the borehole wall. In accordance with one aspect of the invention, the measurement electrodes are spaced apart by a distance that is less than the width of each measurement electrode, thereby ensuring full circumferential resolution.
    • 用于在地层中的钻孔的侧壁上执行电阻率测量的测井工具设置有周向系列的均匀间隔的测量电极,其提供电阻率测量的完整的圆周覆盖。 在一个实施例中,测量电极承载在周向围绕细长心轴或管状物的导电垫上。 导电垫被保持在适于将测量电流聚焦到钻孔的侧壁中的电压上。 优选地,垫具有相对于测量电极的尺寸和测量电极与所述钻孔壁之间的间隔距离,以有效地将测量电流聚焦到钻孔壁中。 根据本发明的一个方面,测量电极间隔开小于每个测量电极的宽度的距离,从而确保全周分辨率。