SU1193270A1 - Self-supporting downhole instrument for geophysical and yield studies - Google Patents

Abstract

AUTONOMOUS WELLING DEVICE FOR INDUSTRIAL GEOPHYSICAL RESEARCH, containing deviation angle, azimuth and time sensors connected through a channel switch with a signal converter, a generator connected via a control unit to a memory unit and a channel switch, and a power supply unit characterized by , in order to increase operational reliability and enhance functionality, it is equipped with a motor shaft rotation frequency sensor, pulse counter, frequency divider, second switch, three a selector, two AND elements and an OR element, the output of the motor shaft speed sensor output is connected to the first pulse counter input, the output of the pulse counter is connected to the second input of the first And element, the output of the signal converter is connected to the second input of the second And element, the first output the control unit is connected to the second input of the pulse counter, and its second output is connected to the input of the selection trigger, the first output of the selection trigger is connected to the first input of the first element I, its second output is connected to the first input of the second elas ® And the outputs of the first and second elements of And are connected respectively to the first and second inputs of the OR element, and its output to the second input of the memory unit, the second output of the master oscillator is connected via a frequency divider and the second switch to the second input of the control unit.

Description

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The invention relates to a drilling technique, in particular, to autonomous devices for measuring and recording downhole parameters, and can be used to measure and record the frequency of rotation of a downhole motor shaft.

The purpose of the invention is to increase reliability and enhance functionality.

FIG. 1 shows a functional diagram of the proposed autonomous field geophysical instrument for recording four parameters: deviation angle from the vertical, azimuth, time and frequency of rotation of the downhole motor shaft; in fig. 2 is a timing diagram illustrating the operation of the device.

The self-contained device consists of a hermetic housing 1, a downhole motor speed sensor 2, a deflection angle sensor 3, sensors azimuth 4 and time 5. In addition, the device contains a 6-channel switch and a power supply unit 18. Converter 7 converts analog signals coming from sensors 3-5 into digital codes. From the output of the converter 7, the transformed information is fed to the second input of the second element I 15. At the same time, from another output of the control unit 9, the first input of the selection trigger 13 receives a signal that flips it to the opposite state, and a single signal appears at the inverse output which arrives at the first input of the second element AND 15 and permits the passage of the signal received at the second input of the second element AND 15. From the output of the element AND 15, the signal goes to the second input of the element OR 17, from the output of which enters the information input of the memory block 10.

In the registration mode of the downhole motor shaft rotation frequency during the duration of the fixed time interval selected by the additional switch 12, obtained by dividing the reference frequency of the master oscillator 8 from the divider 11, counting pulses are received from the downhole motor shaft speed sensor .2. information about the frequency of rotation of the shaft. The permission for the operation of the counter 14 pulses comes from one of the outputs of the control unit 9 to the second input of the 14-pulse counter, at the same time from another output of the control unit 9 to the first input of the selection trigger 13 a signal arrives and throws it into the unit state. The signal from the output of the pulse counter 14 is fed to the second input of the first element I 16. From the direct output of the selection trigger 13 to the first input of the first element 16, a single signal arrives, thereby permitting the passage of the signal received to the second input of the first element 16. From the output of the first element AND 16, the signal arrives at the first input of the element OR 17, from the output of which it enters the information input of the memory block 10.

Recording of the received information is performed according to the signal received from one of the outputs of the control unit 9 to the control input of the memory unit 10, at the end of a fixed time interval. When the recording from one of the outputs of the control unit 9 is completed, a signal arrives at the second input of the pulse counter 14, which resets it to its original state, thus preparing it for counting a new burst of pulses. At the same time, a signal is received from the other output of the control unit 9 in the input b; 1ka 10 of the memory, thus preparing a memory block for recording the scooping information.

 Thus, the recording of signals coming from the downhole motor shaft speed sensor in the memory unit 10, which is performed continuously, and those coming from the deviation angle sensors from the vertical 3, azimuth 4 and time 5 are discrete.

After the memory block 10 is filled with information from one of the outputs of the control block 9, a signal prohibiting its operation is sent to the input of the master oscillator 8, which synchronizes the operation of the entire autonomous device. At the same time, from another output of the control unit 9, the inhibit signal also arrives at the second input of the pulse counter 14. Thus, the operation of the entire autonomous, downhole device is prohibited and in memory unit 10 all information is stored until the device is removed from the bottom.

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Claims (1)

A stand-alone downhole tool for field and geophysical surveys, which contains sensors of the angle of deviation from the vertical, azimuth and time, connected via a channel commutator to a signal converter, a master oscillator connected through a control unit to a memory unit and a channel commutator, and a power supply unit, characterized in that, with In order to increase operational reliability and expand functional capabilities, it is equipped with a motor shaft speed sensor, pulse counter, frequency divider, second switch, trigger m of choice, two AND elements and an OR element, wherein the output of the engine shaft speed sensor is connected to the first input of the pulse counter, the pulse counter output is connected to the second input of the first AND element, the output of the signal converter is connected to the second input of the second AND element, the first block output control is connected with the second input of the pulse counter, and its second output is with the input of the selection trigger, the first output of the selection trigger is connected to the first input of the first element And, its second output is connected to the first input of the second element And, the output The first and second AND elements are connected respectively to the first and second inputs of the ILI element, and its output is connected to the second input of the memory block, the second output of the master oscillator is connected via a frequency divider and the second switch to the second input of the unit UP; equalization.