SU148158A1 - Device for simultaneous recording of several CS parameters and PS curve on a single-core cable - Google Patents

Description

DEVICE FOR SIMULTANEOUS WRITING OF SEVERAL COP AND CURVE PS PARAMETERS ON A SINGLE-CABLE CABLE to the Committee on Inventions and Discoveries at the Council of Ministers of the USSR

Published in the “Bulletin of inventions .V 12 for 1962

Devices are known for simultaneous recording of several parameters of a C.C. and a PS curve on a single conductor cable, consisting of a well bore and ground equipment.

The described device differs from the known ones in that information is transmitted via cable using pairs of opposite-polarity pulses, the time between which is determined by the magnitude of the difference (potentials taken from the measuring electrodes.

The system also uses storage capacitors discharged to the load through pulsed thyratrons. Such an embodiment of the device eliminates the influence of cable parameters on the measured values and requires a low power supply.

FIG. 1 shows a wellbore pattern; in fig. 2 is a diagram of a ground panel of a multichannel electric logging tool on a single core cable; in fig. 3 is a diagram of a mechanical switch converter; in fig. 4 - channel converter.

The power of the well projectile is supplied from the generator / with a frequency of 400 Hz. The current passes through the primary winding of the input transformer Tpi (see Fig. 2), capacitor С2о and then along the CLC through the winding of the power (Trp2 transformer of the wellbore (see Fig. 1) and motor winding M, capacitor Ce and current electrode A. The potential difference from the electrodes. "-L), 2 .." is fed to the inputs of the amplifiers Y.

At the output of the amplifiers, constant voltages are obtained, which are proportional to the potential differences at the corresponding measurement electrodes Mi, z - n - 1.2p.

The outputs of the amplifiers are connected to the contacts of the mechanical switch-converter 2.

Said June 26, 1961 for X 736210/22

No. 148158

A switch rotated by a synchronous motor M for very short periods of time (on the order of 100 microseconds) alternately connects the outputs of the amplifiers to the cathode repeater (the left half of the JJ thyratron in Fig. 1). At the input of the cathode repeater, a sequence of pulses is observed with amplitudes that are proportional to potential differences at the corresponding measuring electrodes, i.e., are modulated in amplitude.

The cathode repeater serves to "match the high output of the amplifiers (on the order of 1 mg) with the low-impedance input of the converter (5-10 clods).

The transducer (the rights of aylovyna thyratron Lg) converts pulses modeled in amplitude into pulses modeled in duration.

The duration of the input pulse does not affect the duration of the output pulse, since the leading edge of the input pulse only charges the capacitor C3, does not change the grid potential of the lamp, and only the back edge of the pulse closes the lamp for the duration of the discharge of the capacitor C3 through resistors and on a tiratron L2 turns over the phase of the impulse and increases the steepness of its rear front. The pulses are differentiated and fed to the thyratron circuit. The leading edge of the pulse ignites the Lz thyratron. In this case, the capacitance of the storage capacitor Cg is discharged through the thyratron and the load resistance Cc (negative pulse). In this case, the JJ4 thyratron does not ignite, since the negative I1M1 pulse on its grid has an amplitude and duration greater than the pulse on its cathode.

The back front of the impulse from the anode of the thyratron Lg ignites the thyratron L and the capacitance of the accumulating capacitor Cd is discharged through the thyratron and the resistance "load c (positive pulse). Charger capacitors Cz and Cd through the resistances Rj and RB.

In this way, at the exit of the wellbore there is a sequence of pairs of times the impulse; the time between the pulses of each pair is determined by the logarithmic law by the potential difference at the corresponding electrodes /W.2...ri and N, 2 ... n. To prevent the supply voltage from falling on the cathode of the thyratron between the output (load resistance c) and the CCV is on resonance filter tuned to 400 Hz.

The impulses at the entrance of the ground panel are transformed by a Tpi transformer. The inductance of the transformer is sufficiently small so that the current supply to the wellbore does not cause a significant voltage drop across the primary winding of the transformer. The secondary winding of the transformer -turns the pulses in phase.

The cascade on the thyratron L is a crossed stage, which overturns in the direction of unlocking the left half of the lamp only by a positive impulse, and in the direction of locking the left half of the lamella by only a negative impulse. Thus, the output of this lamp will be pulses modulated in duration, similar to the anode of the thyratron L of the borehole projectile. These pulses are transmitted to channel converters 5 (see diagram of FIG. 4).

The first lamp of the L converter works as a switch. She / skips the informational impulse only if a commuting impulse is also applied to the circuit.

On the ground panel there is a generator of 4 switching pulses, which is an annular counting cell, which gives switching pulses to the coincidence circuit of the corresponding channel in the required time interval, and is triggered by the falling edge of the pulse in the previous channel.

To shift the phase of the commutating switch there is a button K (-CM. Fig. 2).

In the converter of each channel, the pulses after the coincidence circuit are amplified by the current by the cathode repeater of the thyratron L and converted into a direct current proportional to the average pulse duration for the given channel over a certain period of time.

The VNIIgeofizika Institute notes the usefulness of the described device for simultaneous recording of several CS parameters and the PS curve on a single-core cable.

1. A device for simultaneous recording of several CS parameters and a PS curve on a single conductor cable, consisting of a borehole projectile and ground equipment, characterized in that, in order to eliminate the influence of the cable parameters on the measured values, information is transmitted over the cable assistance of pairs of opposite-polarity pulses, the time between which is determined by the magnitude of the potential difference taken from the measuring electrodes.

2. According to claim 1, characterized in that, for the purpose of consuming low power supply, it uses storage capacitors discharged to the load through pulsed thyratrons.

No. 14815S

Subject invention

On page 3 in line 3 below should read: 2 The device according to claim 1,

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