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    • 5. 发明授权
    • High-resolution high-speed NMR well logging device
    • US07012426B2
    • 2006-03-14
    • US10765611
    • 2004-01-27
    • Carl M. EdwardsDaniel T. Georgi
    • Carl M. EdwardsDaniel T. Georgi
    • G01V3/00
    • G01V3/32G01N24/081G01R33/383Y02A90/344
    • Wireline NMR well logging measurements suffer from disadvantages of poor vertical resolution, logging speeds less than 20 ft/min, and power consumption in excess of 200 W. In spite of these disadvantages, NMR well logging is used because it is capable of providing estimates for a number of petrophysical parameters that are difficult to obtain from other wireline data. These include estimates of the bulk volume irreducible (BVI) of fluids in the formation. The present invention targets BVI and clay bound water (CBW) measurements. Logging speeds of up to 60 ft/min are attainable with little or no loss of resolution. In one preferred embodiment, the tool has four sensors circumferentially distributed around the logging tool and in contact with the borehole wall. A horseshoe like magnet is used to generate the static magnetic field. The magnet poles are designed such that the magnetic field is uniform perpendicular tool motion, as well as provide a sufficiently large extent of the static field to provide polarization for bound water in rock formations. The RF portion of the sensor is comprised of at least one coil configured for transmission of an RF magnetic field into rock formations and at least two coils configured to separately receive the NMR signal from the formation. In another embodiment a coil is wound around the pole pieces or the iron yoke for the purpose of field shifting to enable acquisition of phase-alternated measurements.
    • 8. 发明授权
    • High-resolution high-speed NMR well logging device
    • 高分辨率高速NMR测井装置
    • US06720765B2
    • 2004-04-13
    • US09870287
    • 2001-05-30
    • Carl M. EdwardsDaniel T. Georgi
    • Carl M. EdwardsDaniel T. Georgi
    • G01V300
    • G01V3/32G01N24/081G01R33/383Y02A90/344
    • Wireline NMR well logging measurements suffer from disadvantages of poor vertical resolution, logging speeds less than 20 ft/min, and power consumption in excess of 200 W. In spite of these disadvantages, NMR well logging is used because it is capable of providing estimates for a number of petrophysical parameters that are difficult to obtain from other wireline data. These include estimates of the bulk volume irreducible (BVI) of fluids in the formation. The present invention targets BVI and clay bound water (CBW) measurements. Logging speeds of up to 60 ft/min are attainable with little or no loss of resolution. In one preferred embodiment, the tool has four sensors circumferentially distributed around the logging tool and in contact with the borehole wall. A horseshoe like magnet is used to generate the static magnetic field. The magnet poles are designed such that the magnetic field is uniform perpendicular tool motion, as well as provide a sufficiently large extent of the static field to provide polarization for bound water in rock formations. The RF portion of the sensor is comprised of at least one coil configured for transmission of an RF magnetic field into rock formations and at least two coils configured to separately receive the NMR signal from the formation. In another embodiment a coil is wound around the pole pieces or the iron yoke for the purpose of field shifting to enable acquisition of phase-alternated measurements.
    • 有线NMR测井测量具有不良的垂直分辨率,测井速度小于20英尺/分钟,功耗超过200W的缺点。尽管存在这些缺点,但是使用NMR测井是因为它能够为 一些难以从其他有线数据获得的岩石物理参数。 这些包括地层中流体的体积不可约(BVI)的估计。 本发明针对BVI和粘土结合水(CBW)测量。 记录速度高达60英尺/分,可以很少或没有损失分辨率。 在一个优选实施例中,该工具具有围绕测井工具周向分布且与钻孔壁接触的四个传感器。 使用马蹄形磁铁来产生静磁场。 磁极被设计成使得磁场是均匀的垂直的工具运动,并且提供足够大的静态场的范围以为岩层中的结合水提供极化。 传感器的RF部分包括至少一个线圈,其被配置为将RF磁场传输到岩层中,并且至少两个线圈被配置成从地层分别接收NMR信号。 在另一个实施例中,线圈缠绕在极片或铁轭上,用于场移位以使得能够获取相位交替测量。