SU723107A1 - Acoustic probe signal imitator - Google Patents

Description

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The invention relates to geophysical - CIM well surveys and can be used when removing the metropogical characteristics of acoustic logging equipment.

A device for testing the performance of acoustic logging equipment is known, which contains a counting pulse generator with quartz stabilization l in the time interval shaper.

However, in this device there is no generator of radio pulses, imitating the acoustic acoustics, baths.

An acoustic probe signal simulator is also known, which contains a crystal oscillator, a synchronization circuit with a channel trigger, an interval time trigger, a generator of radio pulses with variable amplitude and a filling signal frequency, switching devices, and a time interval generator 2.

However, the applied circuit of the interval time generator provides a limited number of intervals, the frequency of the radio signal is fixed and does not allow checking the frequency characteristics of the elements of ground equipment, the use of separate switching devices for the interval times of the first and second channels complicates the device.

The aim of the invention is to increase the metrological characteristics of the signal simulator while simplifying its design.

The goal is achieved by the fact that the shaper of time intervals has generators of counting pulses of the first and second channels, a blocking pulse generator, a counter-deflector, AND and OR logic circuits. which through successively

The dinenerator pulse generator: locks and the first switch are connected to one input of the circuit AND, and through the connected counter-decoder and the second switch connected to the second input of the circuit.

FIG. 1 shows a block-h; hem of the proposed device; in fig. 2 output voltage profiles are some ;;; schematic elements.

The signal simulator contains the circuit 1 synchronizing operation of the entire device. It produces pulses equivalent to the firing pulses of the radiators of the downhole probe, the following

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with a period of 4010 si associated with the frequency of the industrial network. A trigger of 2 channels produces pulses of separate formation of interval times, it allows alternate operation of generators of counting pulses of the first and second channels. The trigger of 3 interval times produces the next interval times of the nerve and second channels. Quartz generator 4 generates pulses of different frequencies and synchronizes generators 5 and 6 of the counting pulses, respectively, of the first and second channels.

The signal simulator has the logic circuit OR 7, the generator 8 of the blocking pulses, the first switching device 9, the counter-decoder 10, the second switching device 11, the logic circuit 12, the generator of the radio pulses 13. The key 14 allows the generator of radio pulses to be transferred from the resorption of shock excitation to the mode of continuous oscillations.

Plot 15 is a synchronizing pulse, which is equivalent to the pulses produced by the radiators of the downhole probe. These pulses translate the trigger of the interval times into a single state,

front edge of interval times. Plots 16 and 17 - output pulses from the first and second shoulder of the trigger 2, 18 - output impulses of the trigger 8 interval times 19 output pulses of the radio pulse generator.

The signal simulator works as follows.

Synchronization scheme 1 together with 2 channel trigger provides device synchronization and channel separation, i.e., provides separate

wave pictures of the first and second channels. Their output pulses are shown in FIG. 2 (plots 15, 16, 17). The synchronization pulse trigger 3 nnTepBajUD times translates into a single state, which forms the leading edge of interval times t and G A trigger of 2 channels enables operation of either generator 5 or generator 6. In this case, either the interval time 1G or T, 2 is calculated.

After the logic circuit OR 7, the corresponding counting pulses are fed to the generator 8 of the blocking pulses and to the counter-decoder 10. The switching device 9 selects the required blocking time, after which the permitting potential is fed to the first input of the logic circuit 12. From this point in time, after a certain number of pulses arriving at the counter-decoder 10, determined by the position of the switching device 11, the resolving potential will also arrive at the second input of the circuit 12. At the output of circuit 12, a pulse is generated which returns trigger 3 to the initial state, and time T and T are generated in this way.

Example. Generator 5 produces pulses with a period of 810 seconds, generator 6 - 10–10 s, t. Ё, - 8O; 10 s t -lOO-lO c, and (fs dg-sG, 20-10 s) If you apply the counter-decoder for 1O , for example, Integrated circuits Е t K155IE2 is compatible with K155ID1, and as a switching device a conventional mechanical switch for 10 positions, it is possible to set the time from 80.10 s. At the same time, the operating voltage varies from 20-16 to 20O10 s.

In order to expand the range of variation and Vf, a blocking generator is introduced for the required time using the 8 blocking pulse generator. For example, if the first channel introduces blocking 800-10, and the second channel YuOO-Yu, the times will increase by the corresponding blocking time, and C the time will be 2OOr1O s.

The generator 13 radio pulses contains the generator of sinusoidal oscillations, for example, performed

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according to the capacitive three-point scheme, and a one-shot that unlocks the three-point for the time of its pulse. In this case, at the output of the generator 13, a radio pulse with a rectangular envelope appears. The one-shot trigger is triggered by the back trigger of trigger 3. In order to place the generator in continuous mode, it is necessary to block the one-shot, excluding its triggering. Ta- This mode is required for bench testing of ground equipment, when from to. The amplitude and frequency of the radio pulse is controlled by the power of the typical factory equipment of the system. This makes it easier to select a typical instrument, since it is difficult to find typical meters that determine the frequency of the filling signal of a radio pulse. To change the three-point frequency, you can change the oscillation circuit parameters using switch.

The proposed device, which has high metrological characteristics, can be performed on typical interval elements and is easily embedded directly into ground equipment. In addition, to test ground equipment during logging, it is not necessary to lift the probe from the well. The required control and verification of ground-based equipment can be carried out; at any moment directly in the logging process. Moreover, the test can be fully automatic. Formula of the invention

An acoustic probe signal simulator containing a crystal oscillator, a synchronization circuit with a channel trigger, a trigger for interval times, a generator of radio pulses with variable amplitude and frequency of the filling signal, switching devices, and a time generator that distinguishes between to improve its metrological characteristics, the shaper of time intervals has a generator of counting pulses of the first and second channels, a blocking pulse generator, a counter-decoder, logic circuits and OR, while the crystal oscillator through the generators of the counting pulses of the first and second channels is connected to the inputs of the OR circuit, the output of which is connected via a serially connected generator and blocking pulses and the first switch is connected to one input of the AND circuit, and connected through the serially connected counter-deflector to the second input of the scheme I.

Sources of information taken into account in the examination

1. Elokach DV and others. Calibrator time intervals for acoustic logging equipment. Sat Geophysical instrumentation, vol. 49, 1972, p. 7784.

2. Bukhalo O. P., et al. Simulator of a three-element acoustic probe. Sat Geophysical instrumentation, vol. 6O, 1-977, p. 164-169.

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Claims (1)

SUMMARY OF THE INVENTION 35 An acoustic probe signal simulator containing a crystal oscillator, a synchronization circuit with a channel trigger, an interval time trigger, a radio pulse generator with a variable amplitude and frequency of a filling signal, switching devices, and a time shaper, differing in that that, in order to increase its metrological characteristics, the time interval shaper has counting pulse generators of the first and second channels, a blocking pulse generator, a decryption counter a torus, AND and OR logic circuits, while the crystal oscillator is connected to the inputs of the OR circuit through the counting pulse generators of the first and second channels, the output of which is connected through a series-connected blocking pulse generator and the first switch to one input of the AND circuit, and through the series-connected counter the decoder and the second switch is connected to the second input of the circuit I.