SU303612A1 - DEVICE FOR DIELECTRIC INDUCTIVE CARRING - Google Patents

Description

The invention of devices for geological and geophysical exploration sk;

According to the main author. ev Nil 2il 2387 is known for measuring the conductance of a network and the dielectric value of a network of rocks intersected by a well, by measuring the phase difference of a high-frequency field.

This device contains a generator, a probe with a generator and a triem coil and a lot. The receiving part is a two-chambered system, equipped with two separated and -framed, amplifying channels and a phase-measuring unit at the output.

With measurements of L f in the well, the sitals on the inlet of the Receiver have a large dynamic range, i.e., their amplitude varies over a wide range. These changes are associated with different attenuation values of the signal, depending on the resistivity of the rocks in the borehole section, the specific resistance of the drilling mud, the borehole diameter, and the distance between the generator and receiver coils.

Phase measurements are complicated in cases where one or both signals are less than 1 magnitude necessary for the operation of the MIR devices, which support constant amnliduty and voltage waveforms.

and the input phase-measuring unit. As a result, iBo are the iB measurements errors.

The purpose of the invention is to improve the measurement accuracy by eliminating the sensibility most abnormally when measuring the difference in phase) in the case of small signal amplitudes.

Sign .min) 1. The minimum signal level at the input, during which the normal operation of amplifiers-formers is ensured, the device can be programmed so that when a signal arrives, the value of which is lower than the specified one, the corresponding section in the diagram is highlighted, signal supplied to the recorder.

To this end, in the proposed ycrpoiiCTBO, a block of automatic transmission of information channel 1 is introduced, which is programmed to switch off the measuring part of the circuit. At those moments when the measured signals at the device input are less than a given level at least in one of the channels, and Signal.m of the specified level or close to it.

Pa figs. 1 shows a block diagram of the proposed device; in fig. 2 - a variant of the block diagram of the automatic shutdown of the information channel. The device contains a generator /, is a magnetic field. Generator) loaded on the generator frame 2 of the probe, located coaxially.

At the input of the device a little bit. The measuring coils 3 are connected. The phase separation between the emf is measured from one meter to one another. Then do not connect the power supply to the High Frequency inputs. High-frequency amplifiers are connected with: 1 mixer 5, to JiOTOrim and a common key: heterode and 6. A mixed-fiber switch is connected with a) amplifier circuit 7, the outputs of which are connected to the inputs of the phase-measuring block §. Blak 9 automatic disconnection of the Kaial and transmission information is connected to the amplifier of the multiplier 7, with the output of the phase-measuring unit 8 and the 10 non-transmit signal line to the turn. XNOST, connected to the recording device p.

The electronic circuit of the .9 block may be different from one another, but in all cases it must be unresolved, depending on the size of the input and output device (see Fig. 2).

Block 9 contains electronic relays assembled on LaaPs 2 and 1.3. At the first price, electromagnet relays 14 and / 5 are included. By selecting and L / Kxi, ir, yz is set such ;; working point, at which n-initial anode 1 current will be higher than the switching current of the relay; ipH f / ,, xj smaller, which will have lecTO on the normal operation of the forming y.cTpoiicTua . The y-ray block is provided by the AGC system, which also consists of amplifiers-formers 7, therefore, relay 14 and 15. should be normally closed. In a way, in small signals, when more current is triggered through the relay, the measuring day is opened in one or both channels. When the signals are reached / input within the probe of a given level, the current through the lamps 12 and 13 is reduced under the effect of the negative level of the AGC system. At the same time, the current through the relays 14 and 15 becomes less than the release current of the relay, and the contacts B are measuring.

The device works as follows. The generator is threaded by the generator paaiKy 2 probe current in the CO: Coy frequency. In nrnemno.M device EFS, induced in the measuring coils) of the probe and nmelyushne p and cfj. amplifiers of high frequency 4 are assembled: they are transformed into oscillations of often 1, re-amplified and formed by amplifiers of a forcing 7. With an amplifier formi-amplifiers 7 on a phase 13-merge 1

B. S S Costu 1 comes with the same, but with amplitude AND form, and in unit 9 weir: is ush, voltage is not. At low values of the signals at the input of amplifiers 7. Disconnects the output of the phase compensation unit 8 from the transmission line 10,

but which is the measured voltage on the surface to the recording ycTpoiiCTBV 11.

P r d d e m e and 3 o b e te n n

1. Device for dielectric indukt1; vneshnaya logging but auth. St. No. 212387, characterized in that, in order to turn off the error of the phase difference of the electromagnettool due to the small amplitude of the measured signals, the oio contains a block of automatic disconnection of information transfer to the vertex, destructive1 | Measurement Value 1With a signal drop n;

vkhrde device below a given level.

2. Device but also. 1, characterized in that the ancillary codes of the block of the automatic disconnection of the channel and the transmission of information are connected to the output of the phase measuring

block and the signal transmission line to the surface, and the control part of the amplifiers.

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To line 1O

to block 8

FIG. 2

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