Scaled Experimental Verification of Single-Well Induction Conductivity Measurement Through Nonmagnetic Casing
Scaled Experimental Verification of Single-Well Induction Conductivity Measurement Through Nonmagnetic Casing
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DOI：
10.1109/tim.2013.2238031
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发表时间：
2013-01
影响因子：
5.6
通讯作者：
D. Vasić;V. Bilas;A. Peyton
中科院分区：
文献类型：
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作者：
D. Vasić;V. Bilas;A. Peyton
当导电物体的电导率跨越五到七个数量级时，导电物体的尺寸、完整性或材料特性的电磁感应测量尤其具有挑战性。这种应用是从油井的金属套管内测量周围岩石的电导率。为了确定和重新评价含油气层，需要进行岩石电导率测量。我们提出了第一个实验验证的单井通过套管感应测量的比例实验室模型的钻孔内衬不锈钢或铜套管包围低导电介质。测量的频率范围为2-16 kHz（在实际钻孔的情况下为10-80 Hz）。我们解释了该方法的理论背景，描述了比例模型和实验过程，并讨论了实验结果。测量结果与理论预测一致（相对误差小于15%），钢套管和铜套管的结果（平均相对偏差小于10%）的等效性证实了岩石电导率测量可以根据套管特性（尺寸、电导率和磁导率）的变化进行校正。
The electromagnetic induction measurement of dimensions, integrity, or material properties of conductive objects is especially challenging in the case when the electrical conductivity of these objects spans five to seven orders of magnitude. Such an application is the conductivity measurement of the surrounding rocks from within a metal casing of an oil well. The rock conductivity measurement is required in order to determine and revaluate hydrocarbon-bearing layers. We present the first experimental verification of the single-well through-casing induction measurement on a scaled laboratory model of a borehole lined with a stainless steel or copper casing surrounded with a low-conductive medium. The measurements are in the frequency range of 2–16 kHz (10–80 Hz in case of the actual borehole). We explain the theoretical background of the method, describe the scaled model and experimental procedure, and discuss the experimental results. The measurement results are in agreement with the theoretical predictions (relative error less than 15%), and the equivalence of the results for the steel and copper casings (average relative discrepancy less than 10%) corroborates that the rock conductivity measurement can be corrected for variations in the casing properties (dimensions, electrical conductivity, and magnetic permeability).