SU492834A1 - Acoustic logging equipment - Google Patents

Description

This method of compensation practically does not allow to obtain a multiple value in delay terms (for example, set with not 50 microseconds but 49 or 51, etc., due to imperfections of existing recorders - the main scale does not match and control). very time consuming. The purpose of the invention is to improve the accuracy of measurements by eliminating these drawbacks. This is achieved by connecting an intermediate multivibrator, a compensation trigger, an interlock generator, and a selector, by input, to a computer trigger between the synchronization block and the pulse shaping unit to be measured. Interconnections of the intermediate multivibrator and selec: torus, the inputs of which are connected to the quarto-Gyz generator, and the output of the intermediate multivibrator are connected to the input of the rotirovanie generator, which forms the I) Pulis of interlock of controlled duration. FIG. 1 shows a block diagram of the proposed device; in fig. 2 - voltage diagrams for the section of the LE circuit elements. ; The equipment consists of a wadaklvie generator 1, developed by its rectangular vmpu essy with the frequency of the maximum voltage (network); tgzhggerov dividers 2 and 3; gene ft g -. TRROV starting pulses 4 5; Multivibrator delay 6; multivibrator with viscous 7; eBTCd HepaToi 8 shift pulses stabilized with quartz; HMftyftbcee emission timing schemes 9; filter 1O; intermediary multiplier 11; multimedia computer 1; satsiv 12; of the vibrator 13 mules; measuring t {"gage 14; preo6 | the time user is a constant pressure {15 15; fiction lock 16; selectors 17 and 16 follow up fron 19; 20 allocation, having formed the first arrivals of the recorded signals associated with the downhole charge through the wireline cable. When the toggle switch T is switched to the second position, the device operates in the Calibration mode, in which instead of the recorded signals pulses are sent, often followed by the Quarter Block-hr stabilized, and the temporal parameters of T, Tf, AT are recorded during acoustic logging. The tie-in multivibrator 7 is triggered by the falling edge of the rectangular pulses 2 generated by the multivibrator of delay 6 (see Fig. 2) and is tilted by the angular momentum of the radiation emitted and normalized in cascades 9, 1O. The falling edge of the multivibrator of the anchor 7 j starts cascades 11, 13, - and 19 (see Fig. 2, d, i, k,). Block 8 as a whole generates pulses with a steep leading edge, the frequency of which is stabilized by quartz (see Fig. 2, c). The intermediate multivibrator 11 (sy. Fig. 2, e) is tilted by one of the pulses stabilized in quartz frequency. As a result, the leading edge of the pulse of this multivibrator will be synchronized with one of the first pulses from a continuous pulse series of a quartz oscillator. The pulse duration of this multivibrator is chosen as the minimum and is mainly determined by the frequency of the quartz oscillator; r 50 kHz. Multivibrator produces pulses with a duration of nocm. - (%; "- | th microsecond). t.nocm, selectable to limit, ah4 & 50 microseconds. In the self-oscillator mode, the multivibrator produces pulses with a duration of 3OO-4OO microseconds. The blocking fantastron 16, triggered by the falling edge of impulses from the intermediate multivibrator 11, alternately, for each launching of the trigger, the impulses with durations of “1P1 1AN4L, 1 They t, R, t - 2 tnep and ts at“ “P -jtnep ( see fig. The coefficients n I are selected depending on the diameter, the well and the section under study. The fantastron has a stepped control knob for several positions with different coefficients n ,, and n. During the operation of the lock on the lock 16, the selector 17 is closed. The output pulse at the selector output end of the action of the pulse fadron overturns the compensation multivibrator 12 (see Fig. 2, g), which is triggered by the falling edge of the pulse produced by the intermediate multivibrator 11. Thus, the compensation multivibrator 12 produces alternately pulses with a duration of t -fiftnopi and tj-natnep. (see figure 2, g). The multivibrator measuring 13 is tilted by pulses corresponding to the first entries of the recorded signals, separated and formed by the cascades 20, 18 and 19. Measuring trigger 14 produces two pulses (see Fig. 2, k) for each cycle, the durations of which are T ( -n "tnpp. and Tsmp. Taizm. Proportional to the duration of the impulses Tfmp and x differences (- converter 15 produces quasi-constant voltages and is fed to the inputs; recorder. The compensation value for dT is (fla-n,) tnep., since ddt ta „p-t„ „p“ ta schl - .- (pa - l, jt mr. At the base of the probe S 0.5 m and the frequency of the quartz 5O KHZ for low-speed intervals usually rtg-Uj 5, for high-speed | Nychn-n 2; -n, - 1. PREDEMET and 3 ABOUT AND Acoustic logging equipment, containing a synchronization unit for operation in a pulsed mode, blocks for extracting and shaping the moment of the pulse and the first and the first arrivals of signals, the block forms the duration of the impulse and, according to the measurement, the scheme of binding the indicated blocks to the pulses of the angular momentum, a quartz oscillator p and registration blocks: temporal and amplitude parametres of different types of waves with time converters — pos1-o $ voltage, which, in order to improve the measurement accuracy, the synchronization unit by the formation unit 4VII of the duration of the pulse to be measured, "includes an intermediate multivibrator, a compensation trigger, a generator and a selector, the inputs Tfffiirrepa of compensation are connected to the outputs of the intermediate multivibrator and selector, the inputs are connected to a quartz oscillator, and the output n The multivibrator is connected to the input of a blocking generator, which forms a blocking pulse of a controlled duration.

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