SU330245A1 - METHOD OF WAVE DIELECTRIC CARRING - Google Patents

Description

FIELD OF THE INVENTION The invention relates to the field of numerical-theophysical well testing methods. A known dielectric logging method in which the determination of the dielectric constant s of rocks is carried out by measuring the phase difference of a high frequency (of the order of tens of megahertz) of an electromagnetic field at two points that are some distance from the generating dipole. To take into account and exclude the influence of the resistivity of rocks on the results of determination 8, methods have been proposed in which, along with AF, other characteristics of the high-frequency field are recorded. So is known a method of dielectric electromagnetic logging, where, together with AF, the ratio AI ,, ... is not found, the amplitudes of the signals -.- (often the same two points mean h. Allows the joint measurement of AF and, after processing, determine the value of rocks, free from no specific resistivity. However, this method has serious limitations. With low and medium reservoir thickness and a significant difference in the reservoir and host rocks, there is a strong distortion of the curve due to the influence of reflections from the reservoir boundaries. The accuracy of determining s, and in a number of cases, it is impossible to jointly interpret the AF curves. Also known is a method of high-frequency electromagnetic logging, in which joint measurements of the phase difference AF and I / I g are taken, - / g ZJ are the amplitudes of the secondary field (differential amplitudes of the high-frequency field. Processing the results of the measurements of AF and hz, hz makes it possible to make a separate determination of the range. Both of the measured values, Af and / Zz -th, are not subject to the distorting effect of reflections. However, this method has another serious drawback: one of the measured parameters, 1 / g g, -A g ,, 1, is significantly susceptible to the distorting effect of the drilling fluid, which also reduces the accuracy of the determination. The purpose of the invention is to eliminate the drawbacks of the known methods.

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Fig 5 hz, h, J. The abscissing lines LF and, 1 ca of this point characterizes the decline of the rock, and the ordiata is the value of p. The determination of e and p from the measurement results of the two parameters of the high-frequency field can also be performed using digital or analog computing devices, which previously entered data on the correspondence of certain combinations of LSR and 1 / g, - / I .J to certain values of M'- and R.

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20 30 0 50 60 70 S06 (Rig.2 G Subject of the Invention) Wave dielectric logging method, which implies that a high-frequency electromagnetic field is excited in the well with a frequency of the order of tens of megahertz and the phase difference of the field at its two points is measured, characterized by that, in order to improve the accuracy of determining the electrical properties of rocks, the ratio of the effective amplitude to the amplitude of the field at one point is additionally measured and the dielectric constant and resistance values of the mountain rocks.

Composed by E. E. Terekhova Telred E. Borisova

Editor I. Orlova Order 1451Gaz. No. 286 TSNIIPI Committee on Inventions and

7

2.050; 50-70

KapipeiKTop N. Kovalenko Circulation .448Subscription of discoveries under the Council of the USSR Miiistrov