SU661484A1 - Well-logging photorecorder - Google Patents

Description

. one

The invention relates to a geophysical measuring technique and can be used for recording information in the study of wells by geophysical methods.

Currently, logging recorders HO 13, HO 15, FR6, etc. are widely used. 1.

These recorders (logging oscilloscopes) are light-beam oscilloscopes and contain a block of galvanometers, illuminators, a system of mirrors, a light-sensitive tape and a tape drive mechanism.

The disadvantages of photo recorders include:

significant registration errors due to the mechanical properties of the measuring system;

low reliability due to the sensitivity of galvanometers to mechanical effects;

significant dynamic errors due to the inertial properties of applied oil-filled galvanometers, etc.

Multichannel logging recorders are known in which measuring information is recorded on a magnetic tape or in another way 2, 3. These recorders are complex measuring systems in which information is presented in a form convenient for processing on a computer.

Acoustic logging devices 4, 5 are known recorders. Acoustic devices eliminate the drawbacks inherent in light logging photo loggers, due to the fact that the measurement and recording of drying signals are not carried out using galvanometers, but by means of an electron beam tube. .

A device 6, selected as a prototype, is known, which contains a cathode-ray tube, a scanning unit, a lens, a light-sensitive tape, a tape-carrying mechanism, sources of recorded signals, an automatic control unit for the operation of an oscilloscope and a photo attachment.

The device has the following disadvantages: it is intended to register only the actual wave patterns and phase correlation diagrams generated from the full acoustic signal; and for the register of continuous and separate analog signals, it is necessary to use a special computing device that converts the measured parameter into a pulse of a certain duration, proportional to the value of the pieTHCTpHpyeMoro parameter; the device does not allow to register a large number of continuous independent, time-varying signals, such as signals proportional to the specific electrical conductivity of mountain porodG diameter, the gamma-active NbstG torus rocks, etc., does not allow Scale-based photosensitive tape tags and depth marks. The aim of the invention is to expand the functionality of the Car Photo Recorder. The goal is achieved by the fact that in a known pattop containing a cathode tube, a scanner, the output of which is connected to the deflection organs of the cathode ray tube, a lens, a photosensitive tape, a tape mechanism, sources of recorded signals, a control unit, the outputs of which are connected to the inputs of the scanner and controls of the tape drive mechanism, additionally inserting a block of separators and a combination block. Source Outputs: The registered signals and one of the outputs of the scanner are connected to the inputs of the comparators unit, the outputs of the comparators unit and the other outputs of the control unit are connected to the inputs of the combination unit via matching circuits. The output of the combining unit and one of the outputs of the control unit are connected to the modulating electrode of the cathode-ray tube. FIG. 1 shows a functional diagram of the proposed device; on. FIG. 2 and 3 are timing diagrams for the operation of the device. The logging photo recorder contains electron beam tube 1, lens 2, light sensor 1 tape 3, tape drive mechanism 4, scanner unit 5, control unit 6, comparator unit 7, combining unit 8, coincidence circuit 9, sources 10 and II of recorded signals. Temporary diagrams show the operation of the device curves 12-24. Depending on the type of task to be solved and the type of measurement information, the logging photo recorder control unit 6 provides: a) simultaneous recording of a large number of independent changing signals (for example, signals proportional to the ndptiXr mountain resistivity FROM various Probes, gamma activity of the rocks, borehole diameter, interval time amplitudes of acoustic waves, etc.); b) registration of signals proportional to the measured acoustic parameters using the variable brightness method; c) registration of signals proportional to the measured acoustic parameters using the variable area method; d) frame-by-frame photography of acoustic wave patterns. When the photo recorder is operating in accordance with clause a, continuous, time-varying or permanent signals are received from the outputs of sources 10 of recorded signals (see Fig. 2a, curves 12-15, corresponding to four registered, m independent parameters). In this case, the control unit 6 generates signals for switching on the tape-proof mechanism 4 for uniformly pulling the light-sensitive tape 3 synchronously with the lifting of the downhole tool, and also switches the scanning unit 5 to the horizontal scanning mode only. In this case, the sawtooth voltage from the scanner unit 5 (Fig. 2a, curve 16) is supplied to the other inputs of the comparators unit. At the moments of coincidence of the voltage level of the input signals with the level of the sawtooth voltage of the sweep unit 5 (Fig. 2a, intersection of curves 12-15 with curve 16), short pulses appear at the output of the comparators unit 7 and through the coincidence circuits 9 and unit 8 the combinations are fed to the modulating electrode of the electron-beam tube 1 (Fig. 2.6). On the screen of the cathode ray tube 1, there will be observed light points located on one straight line in an amount equal to the number of registered parameters (Fig. 2, c). Since the scanning of the beam and the comparison of the recorded signals with the sawtooth voltage are carried out synchronously using the same sawtooth generator of the scanner unit 5, the position of each point on the screen of the electron-beam tube 1 will be determined by the value of the recorded parameter. The image from the screen of the cathode ray tube 1 through the lens 2 is projected onto the photosensitive tape 3, which is moved in front of the lens 2 by means of a tape mechanism 4. Each light with a dot on the screen of the cathode ray tube 1 exhibits a curve on the photosensitive tape reflecting the change in the registered parameter. Since the scanning frequency of the scanning unit 5 can be chosen sufficiently high compared with the speed of movement of the photosensitive tape 3 (e.g. 10-20 kHz), the recorded parameter is displayed on the photosensitive tape as a continuous curve. For convenience, deciphering the logs to distinguish the recorded curves in control block 6, a software block is provided that is a combination of multivibrators with different scaling or constant voltage sources, the outputs of which are connected to the inputs of coincidence circuits 9 (Fig. 3 a, b, c, d) At the moments when there are no signals from the control unit 6 of the circuit 9, the coincidences do not pass the signals coming from the outputs of the comparators unit 7. In this case, the 3 curves recorded on the photosensitive tape will be represented either as a flat line (Fig. 3 d, curve 21), or in the form of points or short strokes (Fig. 3 d, curve 24), or in the form of a combination of short and long lines and intervals between them (Fig. 3 d, curves 22, 23).

When the logging photo recorder is operating, in accordance with points "b or" c from the outputs of sources 11 of signals, the full acoustic signals are sent to the inputs of control unit 6. The tape drive mechanism 4 evenly extends the photosensitive tape 3. The control unit 6 sets in the scan unit 5 a standby horizontal scan mode triggered by pulses corresponding to the start of emission of the acoustic wave and entering the full acoustic signal. The acoustic signal from one of the outputs of the control unit 6 is fed to the modulating electrode of the electron-beam tube 1, which on its screen causes a number of bright points of different brightness, which, being projected onto the photosensitive tape 3, will be recorded as continuous (or intermittent) curves of varying degrees of darkness proportional to the amplitude of the acoustic signal.

In the case of frame-by-frame photographing (item d), acoustic signals (from various probe receivers) from the outputs of the source 11 of the recorded signals are fed to the input of control unit 6, which converts the sweep unit 5 to the horizontal and vertical deflection of the cathode ray tube I and to the modulating electrode a cathode ray tube is periodically given short pulses, during which time on the photosensitive tape 3 during its slow stretch, the full wave pattern has time to be exposed.

Thus, the introduction of an additional block of comparators and a union into the photo recorder allows its functionality to be extended, and minimizes:

register a large number of independent, time-varying redphysical parameters on one photosensitive tape (e.g., 10-20 parameters, depending on the number of comparators),

display on photosensitive flax, those scales of measured geophysical parameters by supplying constant reference signals and depth marks to some inputs of comparators by inputting one of the comparators of a certain shape to the input at the moment of arrival of the signal from the depth sensor (sweeper).

The enhanced logging capabilities of the photo logger make it possible to use it instead of the most commonly used light beam logging oscilloscopes currently used. This gives a certain economic effect due to:

reduction of logging logs;

an increase in their yada snosti and increase in the accuracy of registration of geophysical parameters;

reduction of well survey time as a result of decreasing the inertia of the measuring system of recorders, which allows well surveys to be carried out at elevated recovery rates of the well tool;

reducing the required number of recorders in a logging station in the study of wells with complex multichannel (up to 10–20 channels) instruments, since the currently used light beam logging oscilloscopes allow not more than 4 parameters to be recorded simultaneously on one photosensitive tape.

Claims (2)

1. Zavorotko Yu. M. Technique and Technique-4. USSR author's certificate ka geophysical wells. M., No. 375604, class G 01 V 1/40, 1971. “Nedra, 1974, p. 30-41 .-,. o / f 2 US Patent No. 3488661 class 346-1 - USSR Copyright Certificate 1970, class 54B 1, 290253, cl. G 01 V 1/13, 1969. 2. Authors' certificate of the USSR6. AuthorsRgbe certificate No. 207180, No. 549765, cl. G 01 V 1/28, 1974.CL E 21 B 47/00, G01 V 1/13, 1969. teK-sa. 12 7 ./ -13