SU1158748A1 - Self-sustained complex instrument - Google Patents

Description

The invention relates to field geophysics, in particular to instruments for well testing during the testing process. A well-known device for well testing is known, which provides for sequential measurement, conversion into a digital code and recording onto a magnetic carrier of several physical quantities l. Closest to the proposed technical essence. is an autonomous complex device containing a sensor block connected through a channel switch to a software node and through a pulse counter and shift register to a magnetic recorder, a channel number counter connected to a software node and a shift register, a characteristic forming unit connected to a magnetic p A horn and a software node, koryo1 is connected to the magnetic register of RU 2. The interaction of the device's nodes both produces alternate measurements of a part of sensors of physical quantities, the conversion of its values into a sequence ny digital code and recording on magnetic media ny. Measurement time of one parameter measurement cycle duration n is the number of measured parameters Quantization error, with parameter pa for each measured being t. (F. - f) where fu is the final and initial frequency values corresponding to the maximum and zero values of the measured parameters. The dynamic error is -t, where -. the frequency of change of the measured parameter value. The dynamic error is determined by the magnitude of the cycle time T "and does not depend on the value of t ... by increasing t the quantization error is smaller. The total error will be minimal when t p Tc. For the device under consideration, the quantization error is n times larger, minimal, since t, i. The purpose of the invention is to increase the measurement accuracy by increasing the averaging time of each parameter. This goal is achieved by the fact that an autonomous complex device containing a sensor block connected through a channel switch to a software node and through a pulse counter and shift register to a magnetic recorder, a channel number counter associated with a software node and a shift register, a characteristic generation unit, connected to a magnetic recorder and a software node that is connected to a magnetic recorder, equipped with series-connected primary converter, switch, operational counter and three a control driver and a reference frequency generator connected to a divider, frequencies whose outputs are connected to a switch and a software node connected to a control trigger, while the switch is connected to a pulse counter and control trigger. FIG. 1 shows a diagram of the device; in fig. 2 - voltage plots at the outputs of the main units of devices (TC, is the measurement cycle time; tpP, tpT, tpi., Tp p are the recording times for pressure, temperature, viscosity and density, respectively; tj, P,, tf, tj, p - measurement time of pressure, temperature, viscosity and density, respectively), Stand-alone complex device includes primary converter 1, switch 2, operational counter 3, control trigger 4, reference frequency generator 5, frequency divider 6, software node 7, number counter 8 channel, block 9 of formation of a sign, block of 10 sensors, commutation M channel channels, pulse counter 12, shift register 13, magnetic recorder 14. The device operates as follows. Software device 7, which through the frequency divider 6 receives pulses from the reference frequency generator 5, generates a sequence of signals in FIG. 2.1} 2.2; 2.3; 2.4 providing, using the switch, channels for alternately connecting the primary pressure, temperature and viscosity transducers that are part of the sensor block 10 to the input of the pulse counter 12 of FIG. 2, 5), the measurement of the frequency or number of pulses in a packet and the formation with the help of register 13 of sd & ya to which from program node 7 receives shift pulses (Fig. 2, 6) and from channel number 8 counter - channel number codes (Fig. 2, 7), consecutive digital codes (Fig. 2.9; 2.10) physical values proportional to the measurement of physical quantities with corresponding channel number signs. Numeric codes together with a sign of the beginning and end of code groups coming from the device are formed of sign 9 (Fig. 2, 8); register with the magnetic recorder 14. One temporarily during the whole cycle, the Nr 1 signal from the primary I transducer, which measures the 5 gamma isotopic method (Fig. 2, 11), goes through the switch 2 to counter 3 (phi; g. 2, 12), which generates a digital code. At the end of the measurement cycle from the programmed node 7 to the control trigger 4, a signal (Fig. 2, 13) changes the state of the trigger (Fig. 2, 14), which disconnects the primary converter 1 from the counter using the switch 2, it supplies to the counter input 3 pulses of an exemplary frequency (4th. 2, 12) p frequency divider 6. Simultaneously, the model frequency arrives at the counter 12 (Fig. 2, 16). The counter is filled with 3 pulses of the reference frequency until it is reset (Fig. 2, 15). In this case, the switch 2 with the control trigger 4 returns to the initial state. At the same time, the input of the counter I2 in a short time receives a packet of pulses registered by the counter 3 before the beginning of the rewriting of information. Next, a parallel digital code is converted into an interpolation with the help of regi piat 13, it is recorded together with the channel number code and the sign of the beginning and end of code groups in the magnetic recorder 14. In the proposed device, the measurement time duration is provided for the measurement channel) cycle time TC while maintaining alternate polling of primary converters, which allows to obtain the minimum total error. In addition, the possibility of changing the measurement time in the interval allows the subtraction of the transducer frequency in the on-line counter to be performed by selecting the measurement time in such a way that nk. where fjj is the frequency of the primary converter, corresponding to the minimum value of the parameter; p. is an integer; k is the conversion factor of the operational counter.

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Claims (1)

AUTONOMOUS COMPLEX DEVICE containing a sensor unit connected through a channel switch to a software node and through a pulse counter and a shift register to a magnetic recorder, a channel number counter connected to a software node and a shift register, a feature generation unit connected to a magnetic recorder and software node , which is connected to a magnetic recorder, characterized in that, in order to improve accuracy, it is equipped with a series-connected primary converter, switch, operational count sensor and control trigger and a reference frequency generator associated with a frequency divider, the outputs of which are connected to a switch and a software node associated with a control trigger, while the switch is connected to a pulse counter and a control trigger. Φυί.Ι