The principles of a method of isoperimetric high-frequency induction logging (IHtL) are described. Substantiation is provided for a procedure which uses an annular intpedance simulator to check the metrological characteristics of lHIL equipment. The design of the simulator and the sequence of operations performed in using it are described, in addition to a method for testing the simulator. Values are given for the errors of the simulator's parameters.Geophysical studies performed in wells (WGSs) are an essential element of prospecting for oil and gas deposits, making it possible to determine the resistivity of rocks. Such studies are performed with the use of electric and electromagnetic fields that are excited inside the well. In recent years, traditional electrical methods have gradually been replaced by high-frequency electromagnetic methods. In particular, in Western Siberia wide use is now being made of isoperimetric high-frequency induction logging (IHIL).We will first examine the main features of this method. A generator coil is placed inside the well and positioned coaxially with the latter. The coil excites a high-frequency electromagnetic field in the surrounding rocks. Two measurement coils are located on one axis of the generator coil. The set of three coils is called a probe. In a nonconducting medium, the emfs induced in the measurement coils are cophasal. In a conducting medium, the amplitude and phase of the field change due to the induced currents. This creates a potential difference Aq0 between the emfs induced in the measurement coils, and that potential difference is unambiguously related to the resistivity of the surrounding rocks.An IHIL system employs a set of three-coil probes operating at different frequencies with different distances between the coils. The distance between the outermost coils of the probe ranges from 0.5 to 2 m and the working frequencies range from 875 kHz to 14 MHz. The range of resistivity measurement is from 1 to 200 f2-m. Here, the range Aq~ is from 1 to 41 ~
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