SU751977A1 - Method of measuring well yield - Google Patents

Description

this time, calculate the average arnfmeticheskoe values of the measured value over time A (X |) and its standard deviation of st,.

The obtained value o is compared with the specified value of the standard deviation of the resulting arithmetic average a ,.

If, then the measurement / e of this suzazhiny stops and a signal is given to connect the next one. If, then the measurement duration is increased by one step - D / „, i.e. it is set to / 1 D / o + A / l and the arithmetic average of the measured value (xz) and its standard deviation ( 72Calculate the difference between the average quadrant inclusions of cr.vi/a –a and compare it with a given value of the average quadra ;; tic deviation of the arithmetic average cr ,.

If ./ | UiH-Jl: L. - |, then

- zl- / 2 /

psmerenno not stop, and the system gives the resulting value of the arithmetic mean (xg). If this condition is not fulfilled, then the duration of the measurement increases its ei, ei and one interval, i.e. set equal to .is А / 0 + 2А / Н, calculate the average value of x - ,,, and its standard deviation az in time / s, calculate al. -J / --- z.r is produced with-: go comparison, a ,,.

Ecvin (Ji .. / 2, then imererenne; they grind the system too: it gives out xs values.

If this condition is not fulfilled, the measurement duration is increased by one more interval A /,:, the average value and the standard deviation for the newly specified measurement duration are calculated and compared with their values at the previous step.

The indicated procedure for increasing the duration and intent by the value of DA is the calculation of the characteristics and their comparison with those obtained in the previous step .1.0 is made, while a:,. | / 2, where n is the total number of A / "intervals included in the specified measurement duration, equal to / A, After this, the resulting value Xn is given. The drawing shows the structural scheme of the implementation of the described method.

The device contains a hydraulic switch 1, a flow meter 2, an information transfer unit 3, a block 4 for calculating the total flow rate for a given measurement time, a block 5 for calculating the average flow rate for a given measurement time, output of a reliable average flow rate 6, a block for the time interval generator 7 the unit of formation and duration; the current test 8, the block 9 / calculation of the average square deviation of the current values, flow rate, the block 10 for calculating the standard deviation of the average arithmetic and kKoro consumption value, the block // storing the previous value of the standard deviation and calculating the difference of the adjacent values of the standard quadrature deviations, the control mode control unit 12 , unit of the standard deviation of the difference of the mean arithmetic.

The device works as follows.

Through a hydraulic switch / to the measuring system through the flow meter 2 connect the next well. At the time of I3) the measurement of the signal of the flow meter Xn converted in block 3 is knocked out to block 4 in order to calculate the sum value H1; consumption for a set (minimum) length of time A / O and further to block 5 for calculating the average value. At the same time, a signal proportional to the minimum specified time interval A / o is sent from block 5 to the time interval generator 7 at a time. The signal x iodine to block 9 to calculate the variance and determine the standard deviation of the random variable dr, and then to block 10 for calculating the standard deviation of the arithmetic mean of the random will ..

grades a „.

Sigal o "from block 10 iodine to the block // for zapompnanii and comparison with the task (oy) entering the block // from the preset 13 by analyzing the inequality - 1.

.i /,

If this inequality is satisfied, the value of the arithmetic mean of the measured parameter is valid n from the measurement mode control unit 12 iodate the signal to block 6, which allows receiving the signal Xn from block 5 and to block 1 to disconnect the well from the measuring device and connect the next well.

If, as a result of the comparison, it is found

There are inequalities ---:,. one,

t,

then, by means of the measurement mode control unit 12, a signal 6vioiKy is applied to form the duration of the current test 8 for an increase in the measurement duration by one interval A / ,. Upon expiration of the additional measurement time, the signal from block 7 by means of the JO block gives a signal to the block about the mean square deviation of the average arithmetic value obtained for the two intervals of the current test.

In the // block, a comparison is made of the magnitude of the difference in the mean square deviations of the arithmetic mean av over the intervals D / o and D / o + A4- If the ratio of the obtained value of al.d and the given value of the first measure of the scatter of the final result (Yy less or ravio 1/2 , then a signal is sent to block J2 to allow the output of the signal from block 6 about the calculated value of the arithmetic average. If this condition is not met, block 12 sends a signal to block 8 to increase the measurement time by another interval A /, - The cycle continues until Ioka Satisfy p is ieravenstvo G, J Y2.

After that, the measurements are repaired, the resulting value of the arithmetic average flow rate is issued and a command is sent to connect the next well.

Formula 1 about 3

Zasher's method of well productivity by measuring the average

flow rate for a selectively chosen time, which is characterized by the fact that, in order to increase the measurement accuracy by setting the monitoring time during the measurement, the average flow values are determined

and their standard deviations on discretely increasing; time intervals, compare each successive value with the previous one and complete the measurement to achieve the difference of two adjacent root-mean-square deviations of the given setpoint.

Information taken into account during the examination:

1. USSR author's certificate number 439598, cl. B 21 B 47/10, 1971.

2. USSR author's certificate number 446640, cl. E 21 B 47/10, 1972.

Claims (1)

A method of measuring the productivity of wells by measuring the average value of 5 flow rate for an appropriately selected time, characterized in that, in order to increase the accuracy of the measurement by setting the monitoring time in the measurement process, average flow rates of 10 and their standard deviations at discretely increasing time intervals are determined , compare each subsequent value with the previous one and end the measurement after reaching the difference of two adjacent mean square deviations of 15 preset values.