SU1520464A1 - Device for recording logging diagrams - Google Patents

Abstract

The invention relates to oilfield geophysics and is intended to process signals from downhole pressure transducers, temperature, fluid flow, electrical logging and output them to an analog recorder. The purpose of the invention is to improve the recording accuracy by eliminating false drifts due to signal fluctuations from downhole transducers. This is achieved in that a device containing a clock pulse recorder, a transmission circuit, a counter, a memory device, a digital-to-analog converter, an amplifier, an additional transmission circuit and a pulse counter, as well as a trigger are introduced. The number of bits of the additional counter is two times less than that of the main one, which ensures the accuracy of fixation of drifts. 2 Il.

Description

The invention relates to oilfield geophysics and is intended for processing signals from downhole pressure transducers, temperature, fluid flow, electrical logging and transferring them to an analog recorder.

The purpose of the invention is to improve the recording accuracy by eliminating false recording drifts due to signal fluctuations from well transducers.

FIG. 1 shows a block diagram of a device j in FIG. 2 — an example of registration on logging paper.

The device contains 1 clock pulse generator, 2 pass circuit, 3 pulse counter, memory 4, digital-to-analog converter 5, amplifier b, additional transmission circuit 7, additional pulse counter 8, trigger 9, driver 10, pulse frequency divider 11 ,, single-vibrator 12 recording and one-shot 13 installation zero.

The output of the generator 1. clock pulses are connected to the first input of the circuit 2, the transmission and to the first input of the additional transmission circuit 7, the output of the transmission circuit 2 is connected to the counting input of the counter 3, which inputs are connected to the inputs of the memory 4, the memory memories

of the connecting device are connected to the digital inputs of the digital-to-analog converter 5, and the high-order output is connected with the counting input of the trigger 9, the analog outputs of the digital-analogue converter 5 are connected to the inputs of the amplifier 6, the output of the amplifier is connected to the input of the recorder, the output of the additional transmission circuit 7 is connected to the counting the input of the additional counter 8 pulses, the output of the higher bit of the counter is connected to its own control input and to the second input of the transmission circuit 2, the inverse output of the trigger 9 is connected to the third input the transmission circuit 2, and the direct one with the second input of the additional transmission circuit 7, the input of the driver 10 by the communication line is connected to the well transducer, and the output is connected to the input of the pulse frequency divider 11, the output of which is connected to the input of the single-recording 12 of the single-vibration output is connected to the control input of the memory device 4 and the input of the one-stage zero setting 13, the output of which is connected to the installation inputs of the zero counters 3 and 8 pulses

The device works as follows

The clock pulses from the generator 1 through the open transmission circuit 2 arrive at the counting input of the pulse counter 3, in which information is accumulated. The number recorded in the counter in binary code, when the control memory input signal is received by the memory device, is recorded in the memory device and from its outputs goes to the digital inputs of the digital-to-analog converter 5, which converts the digital signal to analog. From the outputs of the digital-to-analog converter, an analog signal is fed to the inputs of the amplifier bis output of the amplifier to the recorder, after recording the information in the memory device to the control inputs of the counters 3 and B pulses a signal is set to zero. Then the conversion cycle is repeated.

In the case when the level of a logical unit is recorded in the highest bit of the storage device, the trigger 9 goes to the state N + 1. at the same time the 2 transmission

0

five

0

five

0

five

0

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will be closed, and an additional transmission circuit 7 will open, and the clock pulses from the generator will be fed to the input of an additional counter 8 pulses, the number of bits of which is two times less than that of the main one. As soon as the output of the high-order counter 8 is turned on the level of a logical unit, the counter is blocked and opens the transmission circuit 2. The main counter starts working. Thus, from the number to be recorded in the main counter, the number recorded in the additional counter is subtracted, due to which the recording is automatically taken down (Fig. 2). This order of operation continues until the level of the logical unit is recorded again in the higher order, then the trigger returns to the initial state and disables the additional counter V. The record will be demolished, etc.

The Pulses Record and Set Zero are organized as follows. Pulses are transmitted from the downhole converter via the communication line to the driver 10, the tracking period of which is proportional to the parameter being measured. Through the pulse frequency divider 11, which serves to set the recording scale, the pulses go to the single-shot input, which is produced by the Write pulse. By dropping this pulse, a one-shot is started, to generate a pulse.

Claims (1)

Invention Formula A device for recording logs containing a clock pulse generator, a transmission circuit, a pulse counter, a memory device, a digital-to-analog converter, an amplifier whose output is connected to the recorder, a driver whose input is connected to the downhole converter, downhole pulse frequency divider, single-oscillator the recording, the input of which is connected to the pulse frequency divider, and the output - with the control input of the memory device and the installation one-shot output Street, whose output soednnen with mustache pulse counter, due to the fact that the recording accuracy is due to the elimination of false recording drifts due to the signal fluctuations of the downhole transducers, it contains an additional transmission pattern and a pulse counter that is two times smaller than the main discharge trigger. In this case, the first input of the additional transmission circuit is connected. with the generator output, and the output with the counting input of the additional counter, the output of which is connected to its own control input and the second input of the transmission circuit; the counting input of the trigger is connected to the output of the higher bit of the memory device; the forward output of the trigger is connected to the second input of the additional circuit transmission, and inverse output - with the third input of the transmission circuit “ . 7 ten  I and 1