SU769470A1 - Device for depth-wise matching of measurement points at well-logging - Google Patents

Description

one

The invention relates to geophysical equipment for recording and pre-processing information in digital form during well logging.

It is known a device for recording depths during well logging, which solves the problem of correcting the recorded depths by the marks on the cable. The device contains a reversible counter, a motion direction sensor, a white block, a correction unit, and a mark sensor 1. However, using this device, it is impossible to quantify the correction that contains information, for example, about the change in cable tension 15 and the cable slipping relative to the block. balance.

It is also known a device that allows the initial information to be combined in depth using a memory block and registering it onto a carrier already in a combined form. The device contains preamplifiers connected via electronic switches and a channel switch with an analog-code converter, a magnetic digital 25 recorder and a depth scrambler, the cube of memory being connected between the analog-code converter and the magnetic digital recorder; control - 33

An analog-code converter output and a software block whose output is connected to the output of channel switch 2. However, this device does not allow sufficiently good coordination of the recorded information with the recording points in depth.

The aim of the invention is to improve the accuracy of combining measurement points (registration) with depth.

The goal is achieved by the introduction of four AND circuits, two triggers, a computing unit, the first and second counters, whose inputs are connected respectively to the outputs of the first and fourth And circuits, the output of the first counter is connected to one of the inputs of the computing unit, the output of the second is with one of the inputs of the second flip-flop, the output of which is connected to the first input of the fourth AND circuit, and the second input of this flip-flop is connected via the OR circuit to the output of the device for marking cable depth marks and quantization step pulses in depth, They are also connected to both inputs of the third circuit AND, the output of which through the inverter is connected to one input of the second circuit. And the second input is connected to the output of the device marking the depths of the cable, and the output of this circuit is connected to the first input of the nervous trngger, the second input of which is connected to the output of the device issuing pulses of the quantization step in depth, the output of which is connected to the first input of the first circuit AND, while the other two inputs of the computing unit are connected respectively to the outputs of the devices issuing the current speed values and tension the cable, and the output of the computing unit is connected to one of the inputs of the depth counter, the output of which is connected to the memory cube. Using the input elements, it is possible to isolate the mismatch between the cable depth marks and the depth pulses corresponding to the quantizing stage, and to perform measurement and recording cycles regardless of the state of the information transmission system, as well as to correct the depth values for cable slippage relative to the roller and its stretching. . The drawing shows a diagram of the proposed device. The device contains counter 1, working synchronously with the switch of the transmitting side and determining the address of the information channel, valve assembly 2, logic circuits 3 and 4 (4 is the entered circuit), the second trigger entered 5, one of its own, connected to the previous logic schemes and valve assembly; the introduced logic 6 OR, the counter 7 entered into the scheme for determining the registration and measurement cycle and connected by an output to the input of the second trigger; analog-code converter 8, in (() memory register 9, memory cube 10, address register 11; the first trigger input 12 connected by its inputs to the output of the quantization step pulse issuing device and through the second input logic I-to the output of the cable depth tag issuing device; the second entered logic And 13; inverter 14; the third entered logic And 15; connected by inputs to devices for issuing cable depth marks and quantizing step pulses in depth; the first entered logic AND 16; The first counter 17, introduced to determine the magnitude of the mismatch of the quantization pulses in depth with the depth marks of the cable and the output connected to one of the inputs of the computing unit. In addition, the device includes an inputted computing unit 18, a depth counter 19, one input connected to the output of a device for outputting quantization pulses in depth, and the second to the computing unit; valve assemblies 20 and 21; logic circuit 22 And, terminals 23-28 connecting the outputs of devices of the telemetering system, respectively: transmitting geophysical information, mapping, sync pulses, issuing cable depth marks, issuing depth quantization pulses, current cable speed values, current cable tension value; terminal 29 connecting the address setting device (remote control) and the registering device 30. The device operates as follows. In the initial state, registers 9 and 11, counters 7 and 17 are in the zero state; the triggers 5 and 12 are in the zero or prohibitory state for the And 3, 4, 16, and 22 coincidence circuits and the valve assemblies 2, 20, and 21. Counter 1 continuously and cyclically monitors the state of the transmitter of the transmitting side switch, since sync pulses of the telemetering system. The measurement (registration) process starts from the moment of the arrival of the pulse of the quantization step in depth and ends after registration of the information of all channels of the telemetric system. The arrival of the depth quantization pulse in the general case can occur while counter 1 is in any of the intermediate states and ends when the counter returns to the same state. The impulse of the quit-time step, passed through the scheme OR 6, translates trigger 5 into a single state. As a result, coincidence circuit 3 permits the passage of information to converter 8, coincidence circuit 4 permits the passage of clock pulses to counter 7 and the analog-code converter control input 8. Valve assembly 2 permits passage of counter 1 state codes, channel addresses, and therefore and information codes, to the address register 11. The information supplied to the converter analog-code 8 is converted and supplied to register 9, from where it is transferred to the memory block in accordance with the address code in register 11 Counter 7 counts the clock pulses and, having calculated to a value equal to the number of channels of the tele system, returns to the zero state, acts on the second input of the trigger 5, which in turn returns to the zero state. As a result, the coincidence circuits 3 and 4 and the valve assembly 2 go into the prohibit state, and the registration and conversion cycle ends there until the next pulse of the quantization step. The pulses corresponding to the quantization depth step simultaneously arrive also at a depth counter 19 and trigger 12. With the arrival of these pulses on trigger 12, the latter remains in the dead state for the coincidence circuit 22 and the resolution for the coincidence circuit 16. When trigger 5 returns to its original state the resolution, which is permissive for the coincidence circuit, the assemblies 20 and 21, through the circuit 22, receive the permission to transmit the next value

the depth at the address specified by the registrar console or in some other way (terminal 29).

Thus, the measurement cycle is accompanied by its depth value and all this information is in the memory block 10, from where it is already being sent to the recorder 30.

The momentum of arrival of the pulse corresponding to the depth mark on the cable, in the general case, does not coincide with the pulses of the quantization step and precedes any of them.

After the circuit OR 6, this pulse, if the measurement cycle has already ended (if the pulse coincides with the measurement cycle and the last cycle is not violated), an "extraordinary start of the circuit for measurement (registration) occurs, because trigger 5 is brought to the enable state. This measurement cycle cannot be violated even in the case of the arrival of the next quantization pulse by. the depth. The measurement cycle will occur as described. At the same time, the depth mark impulse arrives at the trigger 12, which enters the resolution state, and the sync pulses through the coincidence circuit 16 begin to flow to the counter 17 to determine the value of the mismatch of the depth mark pulses with the quantizing pulse. The counting will occur before the moment of arrival of the quantization step pulse, immediately following the depth mark pulse. Upon the arrival of this pulse, the trigger 12 returns to the initial (prohibiting) state and the pulses through the AND circuit 16 on the receiver 17 stop to flow. The content of the counter 17 enters the computing unit 18, where the current values of the speed of the cable and its tension are received via terminals 27 and 28. In the computing unit 18, the correction value is calculated taking into account the speed (slippage) and tension (elastic tension or elongation), and the value of the depth counter 19 is corrected by the calculated value. The impulse of the quantization step, which determined the counting end of the counter 17, determined the next measurement cycle i.e., when trigger 5 for AND circuit 22 is in the prohibit state. Therefore, as soon as the measurement cycle finishes and the trigger 5 enters the registration prohibition state and, accordingly, the resolution state for AND 22, the corrected value of the loop from the counter 19 through the assembly 20 with the corresponding address value is received through the assembly 21 to the registers 9 and 11, respectively, then through the memory block 10 a registrar 30. The described process of correction takes place every time during the impulse of the depth mark pulse, taking into account the cable tension and its speed. With the help of hems 13–15, the indefinite stay of trigger 12 in the event of a coincidence

in the time of the pulses of the depth mark and the pulses of the quantization step. In this case, no synchronization pulses will arrive at the counter 17, i.e. the mismatch between these pulses is equal to “O.

Since an estimate of the mismatch that may occur between the depth marks and the depth pulses corresponding to the depth quantization step occurs

at a distance of one quantization step, the circuit allows almost completely matching the measurement points (registration) with the depth. The error of the error can not be greater than the path traveled by the device during the measurement cycle (registration, but this value is many times smaller than the quantization step. In addition, the correction of the depth values is the origin, taking into account the cable slippage and its tension.

Thus, the matching device will improve the accuracy of matching when registering depth values with the corresponding values of geophysical information, which improves the quality of the final

results of data, and this in turn leads to increased efficiency of geophysical research.

Claims (2)

Invention Formula A device for matching depth measurement points during well logging, connected to a telemetering system for issuing geophysical and service information and containing a memory cube with control and program blocks connected between the analog-code converter and the recorder, a depth counter connected to the recorder, that, in order to improve the accuracy of matching, four And schemes, two triggers, a computing unit, the first and second counters, whose inputs are connected respectively to the outputs, are introduced into it ervoy and fourth AND gates, the first counter output is connected to one input of the computing unit, the second output - to one of the inputs of the second flip-flop, whose output is connected to the nerve enters the fourth AND gate and the second input of this flip-flop through an OR gate connected to the output of the device marking the depth of the cable and the quantizing step pulses in depth, which are also connected to both inputs of the third AND circuit, the output of which through the inverter is connected to one input of the second circuit And, the second of its input is connected to the output of the device marking the depth of the cable, and the output of this circuit is connected to the first input of the first trigger, the second input of which is connected to the output of the pulse quantizing output device in depth, its output is connected to the first input of the first circuit AND, while the other two inputs of the computing unit are connected respectively to the outputs of the output devices of the current speed and cable tension, and the output of the computing unit is connected to one of the inputs depth counter, the output of which is connected to the memory cube. 2. Device but p. 1, characterized in that, in order to synchronize the operation of the device with the irregular and utilized equipment of the telesystem, the second inputs of the second and fourth circuits And are connected to the output sync pulse devices telesystems. Sources of information taken into account in the examination 1. USSR Author's Certificate No. 392233, cl. E 21B 47/00, G9b7. 2. USSR author's certificate LL 441542, cl. G 01V 3/18, 1971 (prototype).