SU1573149A1 - Device for checking rotation speed of turbodrill - Google Patents

Abstract

The invention relates to the technology of researching wells during drilling and improves the accuracy of determining the frequency of rotation of a turbo-drill shaft. The order of operation in the device is provided by four triggers 1,2,4 and 19, signal distributor 3, generator 5, two elements 6 and 7, as well as counters 8.9 of the specified minimum interval of averaging. The actual averaging time interval is fixed by registers (P) 10,11. During this time, the number of pulses from the tachometer is recorded in the P 12-14 significant part. The result of dividing these two signals at the output of dividers 20-22 is proportional to the frequency of rotation of the turbo-drill, which is fixed by P 23-25 and through the decoder enters the indicator. To increase the accuracy of measurement and to adjust the revolutions of the turbo-drill with the number of pulses of the tachometer, P 15-18 additional lower zero bits are used. 1 il.

Description

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The invention relates to a process test of wells during drilling and can be used to obtain information useful for predicting the state of the drilling equipment and optimizing the drilling mode.

The aim of the invention is to improve the accuracy of determining the frequency of rotation of the shaft of a turbo-drill.

The drawing shows a functional diagram of a turbodrill speed control device. The main roll - a block for selecting the actual averaging interval contains the first trigger 1 for selecting the first and last mark of the actual averaging interval, the second trigger 2 for allocating the published minimum averaging interval, the distributor for 3 signals (containing two two-input elements - ta And, the third trigger 4 blocking The reading frequency of the number of tags, the Heather 5 reading frequency and sectional pulses, two elements And 6 and 7, as well as two binary binary decimal counters 8 and 9 of the specified minimum averaging interval. The device also includes the registers 10 and 11 of the actual interval of the averaging, augmented register of the number of tags containing registers 12-14 of the significant part, registers 15-18 to - Additional low-order zero bits and fourth trigger of the 19 subtraction end, dividers 20-22, as well as the rotation speed register 23-25 of the turbo-drill.

In the device, the output of a tachometer (not shown) is connected to the first and second inputs of the 3 signal distributor, as well as to the first inputs of registers 12-14 of the significant part, the first output of the 3 signal distributor is connected to the S input of the first trigger 1, and the direct and inverse outputs the second trigger 2 is connected to the third and fourth inputs of the 3 sig nal distributor, the second output of which is connected to the R inputs of the first 1 and third 4 flip-flops. The direct output of the first 1-rigger 1 and the first output of the generator D are connected respectively to the first and second inputs of the first element 6, the output of which is connected to the inputs of counters 8 and 9 of a predetermined minimum averaging interval and registers 10 and 11 of the actual averaging interval eight

and 9 and registers 12-14 of the significant part are connected by c.R-inputs of the second 2 and fourth 19 flip-flops respectively, and the outputs of the registers 10 and 11 of the actual averaging interval are connected with the first inputs of the dividers 20-22. Inverse output of the third 4 and direct output of the fourth 19 triggers, and

also the second output of the generator 5 is connected respectively to the first, second and third inputs of the second element And 7, the output of which is connected to the second inputs of dividers 20-22 and to

5 inputs of registers 15-18 additional low-order zero bits, the output of which is connected to the second inputs of registers 12-14 significant part. The outputs of the dividers 20-22 through registers 23-25

The turbo-drill rotational frequency Q and the decoder are connected to an indicator (not specified).

The essence of the invention is that it automatically implements 7

5 sec is the averaging of the number of revolutions over a certain time interval, taking into account the last incoming tachy pulse. The resulting average speed of a turbo-drill can be used

Q for control purposes, as it reflects the actual process of drilling, and not fluctuations in it. The averaging interval is chosen based on the nature of

well cuts empirically. The need for averaging, rather than getting

instant readings is explained by the fact that each specific readout can be largely random, for example, when the bit is pressed or detached from the bottom, i.e. Each individual value of the number of revolutions may not correspond either to the density of rocks traversed in the well, or to the technical condition of the bit or turbo-drill. Selection of averaging interval

45 is carried out, based on the resolution of the research method, from the well structure, from the lithological characteristics of the rocks, and then the measured average speed is a real reflection of the drilling mode and the technical condition of the rock demolishing tool.

The device works the next time.

In the initial state, all elements of the device are set to the following positions; first trigger 1, counting 8 and 9, registers 10 and 11,

0

15-18, 12-14, 23-25 and dividers 20-22 are set to the zero state. The second 2, third 4, and fourth 19 flip-flops are set to one.

The operation cycle of the device starts with the arrival of the first label in the form of a positive voltage drop from the sensor. Each tag is a signal that the turbo-generator has performed a standard speed of 20. The cycle must end after the minimum standard time interval for averaging (100 s) with the arrival of the black mark taken over the last one. The first label through the distributor of the signals fed to the S-input of the first trigger 1, mouth

pouring it into the unit state, after which the second pulses of the first output of the generator 5 begin to receive second impulses to the counters 8 and 9, the minimum specified

averaging interval, and in registers 10 and 11 of the actual averaging interval. After 100 seconds, counters 8 and 9, built on the basis of binary-decimal counters, produce a pulse of negative voltage drop, which arrives at the R input of the second trigger 2. The second trigger 2 changes its state to zero, which, however, does not leads to a change in the state of the first trigger 1, because, in the absence of a label, the same positive voltage potentials, i.e. registers 10 and 11 continue counting second pulses. With the arrival of the next (taken for the last) label, the R input of the first trigger 1 receives a negative voltage drop, which translates it into the zero state, in which the valve, the first element And 6 stop the flow of second pulses to the registers 10 and 11 of the actual averaging interval . At the same time, the same negative differential at the R input of the third flip-flop 4 changes its state to zero and the read frequency (for example, 100 kHz) from the second generator output 5 through the second element And 7 enters the subtracting input of registers 12-19 of the number of marks and simultaneously to the second inputs of dividers 2.0-22. Receipt reading pulses

with

five

0

5 0 with Q 0, -

49

Tables 20–22 continue until the registers 15–18 and 12–14 are completely subtracted. In this case, the fourth trigger 19 changes its state to zero and locks the second element AND 7. Thus, dividers 20-22 receive the number of pulses equal to the number written in the significant part of the registers 12-14 multiplied by 10, where n - the number of additional minor bits (15-18). The first installation inputs of the dividers 20--22 are supplied with codes corresponding to the values of the actual averaging intervals recorded in registers 10 and 11. The division is carried out as follows. Divisor counters 20 and 21 operate in subtraction mode, so only m pulses are output from the total number of subtractive pulses N, where m

N -, where K is the number transmitted from

TO.

registers 10 and 11 in dividers 20-22. The scheme used four additional low-order bits 15–18 of registers 12–18 of the number of tags. Two of them were used to raise the accuracy to 1% when dividing, and the other two (together with counter 22) - to multiply the number of marks by 20 to get the number of revolutions. From dividers 20-22, the number of pulses, corresponding to the number of revolutions per second, averaged over the actual time interval, goes to the rotation speed register 23-25 of the turbo-drill, from where it is fed through a decoder to the registration or to the control system.

The positive effect of the invention is that due to the increased efficiency, it is possible to influence the drilling mode in a timely manner, and due to the increased accuracy, it is better to estimate the magnitude of this effect. Along with the measurement of other drilling parameters, this makes it possible to automate the drilling mode, which can be both a technical effect from the point of view of optimal drilling, and an economic effect consisting in reducing the time and cost of drilling.

Claims (1)

Invention Formula A turbodrill speed control device containing a tachometer and an indicator, characterized in that, in order to improve the accuracy of determining the rotation speed of the turbodrill shaft, the device is equipped with four triggers, ras, TJLM signals, a generator specified minimum interval of averaging, divider, decoder, as well as registers of the actual interval of averaging, meaningful part, add, the additional lower zero bits and rotation frequency, of the turbo-drill, while the tachometer is connected to the first and second inputs of the signal distributor hajojo and with the first input of the register of the significant part, the first output of the signal distributor is connected to the S input of the first trigger, and the direct and inverse outputs of the second trigger are connected to the third and fourth inputs of the signal distributor, the second output which is connected to the R-inputs of the first and third triggers, the direct output of the first trigger and the first output of the generator are connected to the corresponding 10 The inputs of the first element And whose output is connected to the inputs of the counter of the specified minimum averaging interval and the register of the actual averaging interval, the outputs of the counter of the specified minimum averaging interval and the register of the significant part are connected to the R inputs of the second and fourth triggers, respectively, and the output of the register of the actual averaging interval is with the first input of the divider, the inverse output of the third and the direct output of the fourth trigger 5 5, and the second output of the generator are connected to the corresponding inputs and the second element And, moreover, the output of the second element And is connected to the second input of the divider and to the input Q register additional low-order zero bits, the output of which is connected to the second input of the register of the significant part, and the output of the divider through the register of the rotation frequency of the turbo-drill and 25 the decoder is connected to the indicator.