SU462019A1 - Borehole inclinometer - Google Patents

Description

(54) BOTTOM INCLINOMETER

the dulled voltage required to power the sensors of magnitude 1.

The high-voltage connecting filter 21 of the ground device (see Fig. 2) is necessary for removing the voltage of the carrier frequencies from the depth device from the current lead 13. Amplifier 22 with automatic gain control provides the output with an almost unchanged amplitude voltage when the input signal changes within large limits by changing the length of the communication line (current lead).

The discriminator 23 demodulates and separates the parcels. In the imaging unit 24 and 25, the information parcels and the synphation parcels are brought to the required size and shape. Griggers counter 26, through a diode decoder 27, controls the channel switches 2S of the device.

Converter 29 is required to convert the duration of the measurement parcels into voltage pulses of a corresponding amplitude. Integrators 30 and 31 provide memorization of the amplitude of channel impulses. The gauges 32 use analog gauges for measuring the measured parameters and recorders.

The device works as follows. Sensors 1 convert the physical quantity — the angles of curvature, the position of the diverter, and the azimuth — into proportional changes in the phase of the envelope of the output voltage of the sensors. By synchronous detection, the voltage corresponding to the aforementioned signal envelope from the sensors is extracted. The voltages from the detectors 2 are fed to the channel inputs of the temporary switch 3. One of the inputs of the switch also supplies the voltage from the filter 16 with a reference phase, which is necessary to form O and 100% calibration packages in the signal structure.

The switch alternately connects the voltages present at its inputs to the input of the null organ 5 for the duration of the measurement. The zero-body produces a pulse that coincides in time with the moment of zero-crossing from negative to positive polarity of the measured voltage, thus ensuring the dependence of the time position of the output pulse on the phase of the measured voltage.

Trigger 6 is triggered from the corresponding trigger of counter 4. The moment of trigger triggering 6 determines the instant of the formation of the measurement burst, and its reset is effected by a pulse from the output of the null organ. Thus, the duration of the measurement burst is determined by the time interval between the arrival at trigger 6 of a trigger pulse and a reset pulse. By appropriate synchronization of the counter 4, the trigger pulse of the trigger 6 is shifted in time by the time required to form at the beginning of the measurement parcel a constant interval of the stand.

At the output of the logic circuit (assembly) 12, an overhead parsing sync is generated, which is needed for channel separation in the ground device. Measuring and synphating parcels control the keys 7 and 10, which connect the output voltage of the carrier frequencies (information and synphasis) of the generators 8 and 11 to the input of the group amplifier 9. The carrier frequencies are selected based on the maximum noise immunity of the transmission over the communication line. After an increase in 5 amplifier 9, the transmission of carrier frequencies through the connecting filter 14 of the upper frequencies enters the current lead of the electric drill.

From the capacitive divider of the filter 14, the voltage of the electric drill 0 frequency is removed and used for subsequent stabilization and rectification in the power supply unit 15 of the depth device. The same voltage is applied to the filter 16 of the reference voltage. The voltage from the output of this filter is used to synchronize the device as a whole by supplying it to a counter 4 and a sensor power supply unit, including a phase splitter 17, modulators 18, a generator 19, and amplifiers 20. At the output of amplifiers 20 of the power supply unit 0 of sensors, two voltages are generated oscillator frequency 19, amplitude modulated voltages of the electric drill power frequency, varying according to the sine and cosine laws, respectively.

5 On the day surface, incoming information and synphating carrier frequencies sent by the current lead 13 are separated by means of a connecting filter 21 from the power supply frequency voltage of the electric drill, and 0 is fed to the input of the band amplifier 22 of the receiving device with automatic gain control. After demodulation and separation on the basis of polarity in the discriminator 23, the information parcels of direct current and the synphation parcel from the output of the formers 24 and 25 are sent to the PWM-AIM-29 converter and the trigger counter 26 for its synchronization and syncing.

0 The trigger counter 26 through the decoder 27 performs sequential control of channel keys 28 in time.

The voltage from the outputs of these keys with an amplitude proportional to the voltage value 5 at the output of the PWM-AIM-29 converter is fed to channel integrators 30 and 31, to the outputs of which measuring elements 32 are connected. For balanced measurement, elements 32 are connected between 0 corresponding channel outputs the integrators 31 and the output of the integrator 30 of the service channel through which the package is transmitted, corresponding to the zero value of the measured parameters. The latter circumstance makes it possible to exclude

errors arising from the deformation of the measurement parcels during transmission over the communication channel.

Subject invention

A downhole inclinometer including a jog switch and sensors with phase shifters, characterized in that, in order to improve the accuracy of measurements of the azimuth angle, the phase shifters are connected to two modulators, each of which is connected to a filling frequency generator and a phase splitter, and the outputs of the sensors are connected to a stepper switch through synchronous detectors.

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