SU191007A1 - - Google Patents

Description

The known method for measuring dielectric permeability and specific conductivity of rocks under the conditions of their natural occurrence is based on the measurement of electromagnetic parameters i.p. at some) M) m distance from the radiator. As a last resort, an electric or magneto dipole is used. This method has a great deal of inaccuracy due to the fact that the signal amilitude at the measuring point strongly depends on the conductivity, and its phase in a number of cases changes by an amount greater than 360 °. Therefore, it is his MOJKHO to apply only to sufficiently small conductivity values of the studied medium.

The proposed method differs from the known one in that it excites an electromagnetic field with electric and magnetic diols supplied from a single generator, and measures the phase difference and the ratio of the moduli of the electric and magnetic field strength vectors and determines the dielectric constant and the specific conductivity of the mountain rocks.

This makes it possible to increase the measurement accuracy, expand the working area, and significantly increase the capabilities of the non-geophysical research of oil and gas wells.

The proposed method consists in the following;

Two radiators in the form of magnetic and electric diiols, powered by a single generator, are labeled at one point so that their smallpox coincides.

Two receiving antennas, also in the form of magnetic and electric dipoles, are located at a certain specific distance from the emitters so that the axes of the receiving and emitters coincide.

Since there is a rabbiul electric field on the axis of the radiating magnetic field, and an electric field on the axis of the radiating field. 1 ravia bullet iapr zhestyust magitiy floor,

then in the receiving magnetic dinol emf Will be determined only by the value I., -

(L, / (.1 Yaz), (here H-2 is the intensity of the magnetic yol), and the emf, in the receiving electric dipole, is only the value of E., -

(3 D a-Ea) (here, fa is the intensity of the electric yol).

The emf acting in each of the receiving antennas is amplified by an appropriate amplifier and then fed to a device dividing one value by another.

Simultaneously from the output of the amplifiers, signals are added to the meter for measuring the phase difference of one type or another. The signal is proportional to the modulus of the intensity vector

electric and magnetic fields (2) and (N.), and, therefore, the proportional value -, where with - angular frequency

,

floor; e is the dielectric constant; Y is the conductivity, and the signal proportional to the phase difference of 6 arctg is between the electric and magnetized intensity,

E. and I, are transmitted to ground equipment for registration.

Subject invention

The method of measuring the dielectric and conductivity of mining

rocks based on measuring the parameters of an electromagnetic field at some distance from the radiator, characterized in that, in order to increase the accuracy of measurement and expansion of the operating range, the electromagnetic field in the test medium is excited by an electric and magnetic dipole fed from one generator, and measured the phase difference and the ratio of the moduli of the electric and magnetic intensity vectors

fields and determine the dielectric constant and conductivity of rocks by them.