SU1406354A1 - Device for measuring well depth - Google Patents

Abstract

The invention relates to a technique for geophysical surveys of wells and improves the reliability of operation of the device. To do this, it is equipped with a code converter (PC) 6, a permanent memory unit 7 (BPP), two pulse front generators 9 14 and an error indication block 5. The inputs of PC 6 are connected to the outputs of a two-decade reversible counter 3, the inputs of which are connected to the encoder 1 encoder pulse quantization depth signals, motion detection unit 2 and 14. When the downhole tool moves, the pulses corresponding to the depth quantization step 1 and the signal from block 2 is fed to the counter 3 and 4 inputs of the same name. A binary-decimal code is generated at the outputs of counter 3, which converts -. from PC 6 to binary to control the address inputs of BPO 7, in which information is recorded over two address ranges. At the output of the FFI 14, pulses are generated, which are fed to the input of the correction register 5 and to the zero setpoint input. 3. The LTP 7 is switched from one address range to another by trigger 13 on a signal from the decimal counter 8, to the input of which signals are received from the sensor 10 corrective labels. Block 15 is used to indicate errors in the marking of the cable. At the same time, signals from the FFI 9 and the output of the element OR 12 are received at its inputs, which are formed when errors occur in the marking of the cable. The time intervals corresponding to the logic zero level at the output of BPP 7 are temporary gates, allowing counter 8 to count the pulses received from sensor 10. If a log is generated at the output of BPP 7. 1, the counter 8 is reset. 3 il. (L O) oo ate 4

Description

The invention relates to geophysical and well testing, in particular to devices for measuring

Boreholes of borehole drilling in logging.

The purpose of the invention is to increase the operation of the device.

Fig, 1 shows a block diagram of the device; in fig. 2 - functional block diagram of the indication of errors; in fig. 3 - time diagrams of signals.

A device for measuring the depth of the borehole contains a sensor 1 for depth quantization pulses and a block 2 for determining the direction of motion, the outputs of which are connected to the corresponding inputs of the two-decade regressive counter 3 and the binary descending reversing counter 4, the mounting inputs of which are connected

.1 to the outputs of the register 5 correction,

the input of which is connected to the additional input of the reversible counter 3, the converter 6 of the code, the block 7 of the permanent memory, the decimal counter

eight

first shaper 9 front

pulses, sensor 10 corrective SWITCH, element 11 AND, element 12 OR, trigger 13, the second shaper 14 phaonta pulses, block 15 error indication. When this sensor 10 is connected

the first input of the decimal counter 8, the second input of which is combined with

The device works as follows.

Before starting logging into the correction register 5 and in the first two correctable decades L1 and D2 of the binary-decimal reversing counter 35 depth, the number Z ,, corresponding to the distance from the measuring point of the downhole tool to the nearest magnetic mark on the cable, a two-decade reversing score30

the input of the first imager 9 front pulses and connected to the output

b.1oka 1 permanent memory, first

which | soda through the converter

The 61 codes are connected to the outputs of the double-40s. Chick 3 is set to zero.

Ngo reversive counter 3. Per- When moving downhole tool

 input of the display unit 15 display error

connected to the output of item 12 OR,

in Agora, the entrance is connected to the output of the front panel of the front 9 imager and the second 45

 element 11 and the output of which

and the first input, respectively, pod; | 1ucheny to the second input element 12

11 | w and the first output of a decimal score

h) | 1ка 8, the second output of which is connected is a binary-decimal code, which

HifeH with the second input of the trigger 13 and the aid of the converter 6 of the code of the preimpulses corresponding to the quantization step of 0.1 m depth from the output of the sensor 1 of the quantization pulses along and the signal from the block 2 determining the direction of motion go to the same inputs of binary-decimal reversible counters 3 and 4.

At the outputs of the counter 3 is formed

0

five

0

The output of the element 15.1 is connected to the first input of the element 15.2, the output of which is connected to the first input of the element ШШ 15.3, the second input of which is connected to the installation input

 the zero of the element is 15.1, and the output is connected to the input of the zero-setting trigger 15.4, the counting input of which is connected to the output of the element. 12 OR, and the output is connected through the matching element

 15.5 NOT and a cutout on the cathode of the signal LED 15.6, the anode of which

connected to the positive bus supply voltage.

FIG. 3 shows voltage diagrams: 16 — interval of temporary gates formed at the output of block 7 of the permanent memory; 17 - pulses from the output of the sensor 10 correction marks; 18 - signal at the second output of decimal counter 8; 19 - impulse at the output of the second driver of the pulse front 14; 20 - impulse at the output of the first shaper 9 of the pulse front; 21 - the signal at the output of the element 15.1 ;. 22 pulses at the output element 15.2.

The device works as follows.

Before starting logging, the correction register 5 and the first two correctable decades L1 and D2 of the binary-decimal reversing counter 5 of the depth record the number Z ,, corresponding to the distance from the measuring point of the downhole tool to the nearest magnetic mark on the cable, and two-decade reversing score5

0

the pulses corresponding to the quantization step over a depth of 0.1 m, from the output of the sensor 1 of the quantization pulses and the signal from the block 2 for determining the direction of motion are fed to the same inputs of binary-decimal reversing counters 3 and 4.

At the outputs of the counter 3 is formed

 the second driver 14) ont, the output of which is connected to the V: IODE register 5 correction.

The error indication block 15 contains df: p1tel for two - element 15.1, the counting input of which is connected to the output from: |: the generator of the front front 9 is immersed (|) in and to the second input of the element 15.2,

is formed in binary to control the address inputs of the persistent memory unit 7, in which information is recorded at two address ranges. In the first range of addresses of block 7 of the constant memory from 0 to 128 log. 1 za11isyvae) 4 on the game interval 0,5,6- 9). In the second bottom shzogge from 128 to

256 logs 1 is recorded in the interval 138, 139, ..., 218.

Before the start of operation, the trigger 13 and the decimal counter 8 are reset. At the same time on the first output of the counter 8 is set a log. 1, and the second and third - the log. A. At the output of the trigger If more than one impulse is received from the sensor of 10 corrective marks on the interval of temporary gates, this will indicate the presence of false impulses. At the same time, on the first and second output of the decimal counter 8 a log.O will be set, and from the third

Paragraph 13 is set to a potential log, 10 O, at which block 7 of the permanent memory generates signals according to information recorded on the first address range.

At the moments of time when the output of the block 7 of the permanent memory forms T h GT

15

level is log.

decimal

counter 8 is reset. Intervals, 16 times,

corresponding to the level of the log. They are a temporary gate, ra: decisive to the decimal counter 8, the counting of pulses 17, coming from the sensor 10 correction marks. The information recorded on the first address range of the block 7 of the permanent memory corresponds to a temporary gate in the depth interval of +0.5 m, and on the second - t 1.0 m before and after the likely appearance of a magnetic mark on the cable. In those cases when there are no errors in the marking of the cable, one pulse 17 from the sensor 10 to the counting input of the counter 8 arrives at the time gate. As a result, the log output is saved on the third output of the counter 8. The first output counter set log. Oh, and at the second output form-d with the level log. 1. As a result, a short pulse 19 is formed at the output of the second shaper 14 along the positive edge of the signal from the second output of the actual counter B. This pulse arrives at the input of the correction register 5 and at the input of the zero-setting of the two-decade reverse counter 3, in doing so, the installation of the counter 3 to zero and the recording of information from the register 5 correction in the two younger decades D1 and D2 of the counter 4.

After the end of the interval of 16 temporary gates, a log level is formed at the output of block 7 of the permanent memory. 1, by the action of which the decimal counter 8 is again reset to the initial state.

output log.1 through element 12 OR will go to the input of the trigger 13. As a result, the output of the trigger 13 will set the level of the log. H, in which the block 7 of the permanent memory reads information on the second address range. As a consequence, the width of the time gate interval is doubled.

If there is no corrective magnetic mark on the cable, pulse 17, the pre-20 from the output of sensor 10 will not arrive in the interval of temporary gates at the input of the decade counter 8. Therefore, the potential output of the log will remain at the first output of the counter 8. H, which is fed 25 to the first input of element 11I. The signal from the output of block 7 of the permanent memory is fed to the input of the first front-side imager 9, at the output of which a short pulse 20 is formed along the trailing edge of the time gate interval. Under the influence of this impulse

20 at the output of element 11 I a single impulse is formed, which through element 12 OR will set the log level to level 13 during trigger 13. 1. As a result, from the output of block 7 of the permanent memory, the information will be read by the second address range. At the same time, the width of the temporary gate, 40, as well as in the previous case, is doubled.

thirty

35

50

Upon receipt from the sensor 10 correction marks of one pulse,

45 corresponding; a potential log will be established at the second output of the counter 8 on the cable, in the subsequent interval of the temporary gates, on the second output of the counter 8; M. Then, the trigger 13 is set to the initial state, in which the block 7 of the permanent memory forms temporary gates, the duration of which will be halved according to the information recorded by

gg to the first range, addresses of the block 7 of the permanent memory.

An error block 15 is provided to indicate errors in the cable markup.

If more than one impulse arrives from the sensor 10 correction marks on the interval of temporary gates, this will indicate the presence of false impulses. At the same time, on the first and second output of the decimal counter 8 a log.O will be set, and from the third

15

20 25

thirty

40

35

Upon receipt from the sensor 10 correction marks of one pulse,

its corrective magnetic label on the cable, in the subsequent interval of temporary gates on the second output of the counter 8 a potential log will be established. M. Then, the trigger 13 is set to the initial state, in which the block 7 of the permanent memory forms temporary gates, the duration of which will be halved according to the information recorded by

the first range, the addresses of the block 7 of the permanent memory.

The error indication block 15 is intended to indicate errors in the cable markup.

five

The pulse 20 from the output of the first driver 9 of the pulse front enters the input of the divider 15.1, impulses 21 are formed at its output. A signal 21 from the output of the divider 15.1 is fed to one input of element 15.2, and the other front - from the driver of the driver 9 therefore, at the output of element 15. pulses 22 are formed, the frequency of which is two times lower than the frequency of the signal 20 from the output of the first circuit of the driver 9 of the pulse front. The pulses from the extrusion of element 15 arrive through the element 15.3 OR to the input of the zero setting of the trigger 15.4, to the counting input of which impulses come from the output of the element 12 OR. These pulses are generated when errors occur in the cable markup. At the output of the trigger 15.4, a level 11 1 (T

all log 1, when in the interval between two pulses, arriving at its input of setting zero, two impulses will follow to its counting input. This will happen when an additional error is detected on the cable on two successive gates. At the same time, the LED 15.6 lights up on the trigger signal 15.4.

Claims (1)

Invention Formula A device for measuring the depth of a well, containing a sensor for quantization impulses in depth and a block for determining the direction of motion, the outputs of which are connected to the same inputs of a two-decade loop versioned counter and a binary-decimal reversing counter, the setup inputs of which are connected to the outputs of the correction register, the input of which is connected to the setup input of a two-decade reversible counter, a decimal counter, an OR element, the first input of which is connected to the third output of the decimal counter, an output connected to the first trigger input, a sensor of correction marks, an AND element, that in order to increase the reliability of the device, it is equipped with a code converter, a permanent memory unit, first and second pulse front drivers, an error indication unit, with the sensor corrective methods OK is connected to the first input of the decimal counter, the second input of which is connected to the input of the first pulse front generator and the output of the block constant the memory, the first inputs of which are connected to the outputs of a two-decade reversible counter through a code converter, while the first input of the error indication block is connected to the output the OR element, the second input is connected to the output of the first pulse front pulse generator and the second input of the AND element, the output of which and the first input are respectively connected to the second the input of the OR element and the first output of the decimal counter, the second output of which is connected to the second trigger input and the input of the second pulse front pulse generator, the output of which is connected to the input of the correction register. R 9 f gATgj prebarry set to zero (Oui. 2 Tl 12 15 FIG. I t f5-i jf / L 0 cdh 15 Fig.Z