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US5543715A Method and apparatus for measuring formation resistivity through casing using single-conductor electrical logging cable 失效
标题翻译：使用单导体测井电缆测量套管测量地层电阻率的方法和装置
公开(公告)号：US5543715A
公开(公告)日：1996-08-06
申请号：US528358
申请日：1995-09-14
申请人： Bension Singer , Hans M. Maurer , Kurt M. Strack , Otto N. Fanini
发明人： Bension Singer , Hans M. Maurer , Kurt M. Strack , Otto N. Fanini
IPC分类号： G01V3/20 , G01V3/24
CPC分类号： G01V3/24
摘要： A method of determining resistivity of an earth formation penetrated by a wellbore having conductive casing. The preferred embodiment includes inserting a sonde into the wellbore, the sonde having a plurality of electrodes at axially spaced apart locations adapted to electrically contact the casing, applying electrical current between a first and a second one of the electrodes and measuring the current, measuring a first voltage between a first pair of electrodes axially disposed between the first and second electrodes and measuring a second voltage between a second pair of electrodes also axially disposed between the first and second electrodes and disposed externally to the first pair to determine casing resistance in between the pairs of electrodes. A second difference between the first and second voltages is also measured. Current is applied between other electrodes axially disposed to exclude a third pair of electrodes therebetween, and a third voltage is measured between the third pair to determine characteristic impedance. Current is applied between the first electrode and a surface return electrode, a fourth voltage is measured between the first pair of electrodes, a fifth voltage is measured between the second pair of electrodes, an additional second difference of voltages between the fourth voltage and the fifth voltage is measured, and formation resistivity is determined by combining the first voltage, the second voltage, the third voltage, the fourth voltage, the fifth voltage, the current measurements, the second difference and the additional second difference of the voltages.
摘要翻译：一种确定由具有导电套管的井身穿透的地层的电阻率的方法。优选的实施例包括将探头插入井筒中，探头具有多个电极，其轴向间隔开的位置适于电接触壳体，在第一和第二电极之间施加电流并测量电流，轴向设置在第一和第二电极之间的第一对电极之间的第一电压并且测量第二对电极之间的第二电压，其也轴向地设置在第一和第二电极之间并且设置在第一对电极的外部，以确定第二对电极之间的套管电阻电极对。还测量第一和第二电压之间的第二个差异。电流被施加在轴向设置以排除其间的第三对电极的其他电极之间，并且在第三对之间测量第三电压以确定特性阻抗。在第一电极和表面返回电极之间施加电流，在第一对电极之间测量第四电压，在第二对电极之间测量第五电压，在第四电压和第五电极之间测量额外的第二电压差测量电压，并且通过组合第一电压，第二电压，第三电压，第四电压，第五电压，电流测量值，第二差值和附加的第二差值来确定地层电阻率。

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