SU1452948A1 - Self-sufficient digital logging instrument - Google Patents

Abstract

The invention relates to geophysics, in particular to tools for well logging while drilling. The purpose of the invention is to improve the measurement accuracy, the reliability of the recorded information and the expansion of the dynamic range of the device. To do this, keys 8 and 9, an exemplary resistor 10, an element OR 18, a switch 21 groups of codes and a shaper 22 of the loop marks are entered into the device. The device also contains a measuring probe with measuring (M, N) and current (A. A, AZ, ACh) electrodes, input transformer 1, switches 2 and 3, current stabilizer 4, control unit (B) 5. Power supply 6 switch-on sensor 7, pulse distributor 11, summing amplifier 12, zero-organ 13, analog-to-digital converter (ADC) 14, pulse shaper 15, element 16, element 17, 19 B stepper motor control, multi-channel key B 20, pagovogo engine 23, magnetic recorder 24. In measurements, consisting of six consecutive and measurements, four measurements are assigned to a geo measurement (} of 1ptic parameters, and two measurements of model resistivity and a measurement with a shorted output of the reader of the beginning of the measurement cycle is formed and recorded at the first measurement. nine tracks of a small carrier. If the output code from the LCP is less than the maximum nine-bit, the first nine bits of the output of the ADC are searched, starting with the fourth, and on the tenth track of the magnetic carrier is marked a scale. 1 il. S (L 4 cl to; about 00

Description

This invention relates to field geophysics, in particular to tools for well logging while drilling.

The aim of the invention is to improve the accuracy of measurements, the reliability of the recorded information and the expansion of the dynamic range of the instrument.

The drawing shows the block diagram of the device.

The device contains a probe with measuring M, N and current A, A, A, A electrodes, 10 input transformer 1, two switches 2 and 3, current stabilizer 4, control unit 5, power supply unit 6, switch 7, two keys 8 and 9, exemplary resistor 10, pulse distributor 11, summing, r amplifier 12, null organ 13, analog-to-digital converter 14, pulse shaper 15, first element OR 16, element 17, second element OR 18, control unit 19 stepper motor, multichannel key block 20, switch 21 20 group of codes, formulator 22 tags la, stepper motor 23 and magnetic recorder 24.

The measuring electrode is connected to the primary winding of the input transformer 1, the secondary winding of which is connected to the inputs of switch 2. The current electrodes are connected to the input of switch 3, and the common current electrode is connected to the first output of current stabilizer 4, the second output of which is connected the input of the switch 3, and the input 30 with the first input of the control unit 5, which is connected in series with the power supply unit 6 and the activation sensor 7. Through the switch 8, the second output of the current stabilizer 4 is connected to the output of the switch 9, one of the terminals of the reference resistor 10 and the third input of the summing amplifier 12. One of the inputs of the switch 9 is connected to the sixth output of the pulse distributor. The first input key 9 and the second output of the reference resistor 10 are connected to a common bus. The control inputs of switches 2 and 3 are connected to the first four outputs of the distributor 1 1 pulses, the fifth and sixth outputs of which are connected respectively to the second inputs of keys 8 and 9. The output of switch 2 is connected to the second input of the summing amplifier 12, the output which through a null-organ 13 is connected to an analog-to-digital converter 14, the analog output of which is connected to the first input of a summing amplifier 12.50

The first input of the control unit 5 is connected to the input of the reference voltage of the analog-digital converter 14, and through the pulse shaper with its clock input. The second output of the control unit 5 is connected to the installation input of the distributor 55 1 1 pulses and to the first input of the element OR 16, the output of which is connected to

the start input of the analog-digital converter 14. The third output of the control unit 5 is designed to supply voltage to the measuring part of the device. The second input element OR 16 is connected to the first input element AND 17, the second input of which is connected to the first output of the distributor II pulses, and the output - to the input of the control unit 5. The tenth, eleventh and twelfth bits of the analog-digital converter 14 are connected respectively to the first, second and third inputs of the element OR 18. The output of the end of the formation of the analog-digital converter 14 is connected to the control input of the distributor 11 pulses, the input of the stepper motor control unit 19 and the control input of the multichannel key block 20. The outputs of the first nine digital bits of the analog-digital converter are connected to the first group of inputs of the switch 21 code groups, and the digital bits from the fourth to the twelfth - with its second group of inputs. The output of the OR element 18 is connected to the control input of the switch of code groups 21 and the first input of the multi-channel key block 20, the second input of which is connected to the output of the switch 21 of code groups, and its third input is connected to the second output of the control block 5 via the driver 22 . The output of the stepper motor control unit 19 is connected to the primary input of the element I 16 and through the pinch motor 23 to the input of the magnetic recorder 24, the second input of which is connected to the output of the multichannel key block 20.

The device works as follows.

After the device is lowered into the well together with the drilling tool with the start of circulation of the flushing fluid through the pipes, the switch-on sensor 7 switches on the power supply unit 6, which is connected to the control unit 5 and through it to the measuring circuit. A sinusoidal voltage, for example, a frequency of 500 Hz, from the first output of the control unit is fed to the input of the current stabilizer 4 and to the input voltage of the analog-digital converter 14, and the input of the analog-digital clock clock pulses are shifted by 90 ° relative to the reference voltage. According to the signal from the second output of the control unit, the distributor AND pulses are set to the first state corresponding to the measurement of the first parameter, the analog-digital converter 14 is started simultaneously via the first element OR 16 and through the driver 22 of the loop label and the multi-channel key block 20 on the 12th track of the magnetic the carrier is marked with a loop. After the time interval required

A / D converter 14 converts the analog signal from the output of the first switch 6 to the corresponding parallel binary code; a binary code appears on the digital outputs from the first to the twelfth bit corresponding to the value of the first parameter. Moreover, the code value is larger than the maximum nine-bit code, i.e. 511, then at the higher bits: tenth, eleventh, and twelfth, at least one unit is present, and the OR 18 element opens the switch of 21 code groups for passing the 20th to the 12th and 14th bits of the analog-digital converter 14 to the inputs of the multi-channel key block records the scale label on the eleventh magnetic track. If the code at the output of the analog-to-digital converter 14 is less than the maximum nine-bit, the switch 21 of the code groups passes the code from the bits of the analog to digital converter 14 from the first to the ninth to the inputs of the multi-channel key block 20 and does not record the scale mark. At the same time, at the output of the conversion end of the analog-to-digital converter 14, a pulse appears that opens the inputs of the multi-channel key block 20 for the selected ten-bit code group. The selected group of codes is recorded on the first nine tracks of the magnetic carrier, and on the tenth pulse of the end of the transformation. The impulse of the conversion end converts the pulse distributor 11 to the next state and starts the control unit 19 of the stepped motor. Upon completion of the pulse at the output of the scap motor control unit 19, the scap motor 23 produces a single offset of the magnetic carrier in the magnetic recorder 24 and starts the analog-to-digital converter 14 through the first element OR 16 and starts measuring the second parameter.

When switching the distributor 11 pulses. In the fifth position, the first switch 8 is opened and the output of the current stabilizer 4 is connected to the exemplary resistor 10, the voltage drop on which is measured by the analog-digital converter 14 and recorded on a magnetic carrier. When the distributor 11 pulses are switched to the generous position, the second key 9 is opened and the third input of the summing amplifier 12 is connected to the common device bus, zero is measured and recorded in a magnetic recorder. From the simple position, the distributor 11 of pulses switches to the first one and, according to the signal from the output of the control unit 19, the scap motor via the element 17 sends the signal to the control unit 5 to disconnect the power from the meter

ten

20

25

15

thirty

3f

40

45

50

five

Noah part of the device. After a certain time interval (for example, 16, 32 or 64 s), the control unit 5 again switches off the power to the measuring part of the instrument and a new measurement cycle begins.

Improving accuracy is achieved by calibrating the instrument in each cycle additionally, for which it is sequentially measured and recorded on a magnetic carrier when the input signal is fed to the value of the output signal from zero, and then from the reference resistance, and when reading information from magnetic This additional information carrier eliminates the error associated with zero care and a change in the conversion rate of an autonomous logging tool. For this, two keys and an exemplary resistance are introduced into the device.

The widening of the dynamic range with a decrease in the number and cycles of measurement and the limited number of tracks used for parallel recording (10) is due to the use of an analog-digital converter with the necessary dynamic range (12 bits). Moreover, when the output code of the analog-to-digital converter (ADC) is less than the number 511, i.e. the maximum nine-bit code, nine lower-order ADC bits (i.e., first to ninth bit) are recorded onto magnetic media, and if more, then the nine highest-order ADC bits (fourth to twelfth bit) are recorded and a scale mark is placed on one of the tracks of the magnetic carrier. For this purpose, the second OR element and the switch of code groups are introduced into the scheme. Selection of numbers of recorded bits, i.e. Scale selection occurs automatically during one set of an internal ADC counter when measuring each parameter. Thus, the time of active operation of the device is reduced.

Improving the reliability of the recorded information is achieved by recording the label "Measurement is performed during each measurement, and label" Start of the cycle - when measuring the first parameter. When recording, a separate track on magnetic media is recorded for recording the start of a loop. To form the “Start of the cycle” label, the “Start of the cycle.”

Claims (1)

Invention Formula A standalone digital logging device containing a probe with measuring and current electrodes, measuring electrodes are connected to the primary winding of an input transformer, the secondary winding of which is connected to the first switch. foKOBbie electrodes are connected to the inputs of the second switch, and the common electrode to the first output of the current stabilizer, the second f) ofi whose output is connected to the input of the second j) oro switch, and the input to the first output of the control unit, the control inputs of the first and the second switch of the connector with the first four outputs of the pulse distributor, the output of the first switch is connected to the first input of the summing amplifier, the output of which is connected to an analog-digital converter, the analog output of which is connected to second entrance from As the amplifier is muting, the first output of the control unit is connected to the input of the reference voltage of the analog-digital converter directly and through the pulse shaper - to its input of clock pulses, and the second output of the control unit is connected to the installation input of the pulse distributor and with the first input of the OR element, the output of which is connected to the start input of the analog-digital converter, the second input of the OR element is combined with the first input of the AND element and connected to the output of the stepper motor control unit, the second input The AND terminal is connected to the first output of the pulse distributor, and the output is connected to the first input of the control unit, the switch-on sensor is connected to the second input of the control unit through the power supply unit, the output of the analog-digital converter is connected to the control input of the distributor, control | stepper motor and control input - 1 house of multichannel key device, output of control unit Q 0 Q five connected via a stepper motor to a first input of a magnetic recorder, the second input of which is connected to the output of a multichannel key block, characterized in that, in order to improve measurement accuracy, reliability of the recorded information and expand the dynamic range of the device, two keys are inserted in it, the second OR element, the switch of code groups, the loop label generator, the fifth output of the pulse distributor connected to the first input of the first key, the second input of which is connected to the output ohm current stabilizer, the sixth output of the pulse distributor is connected to the first input of the second switch, the second input of which is combined with one of the terminals of the reference resistor and connected to the zero potential bus, another output of the reference resistor is combined with the outputs of the switches and connected to the third input of the summing amplifier, the second output the control unit is connected to the first input of the multichannel key block through the shaper of the loop label; the outputs of the first nine bits of the analog-digital converter are connected according to The switch inputs of the code group, to the other inputs of which are connected the outputs of the fourth to the twelfth bits of the analog-digital converter, the outputs of the twelfth, eleventh and ten bits of which are connected to the inputs of the element OR whose output is connected to the control input of the switch groups codes and to the second input of the multi-channel key block, the third input of which is connected to the output of the switch of code groups.