The method for determining the flow rate

 

(57) Abstract:

The invention relates to the field of research wells and can be used to determine the flow rate of the wells are equipped with deep-well pump. The task of the invention is to simplify the method, the reliability and accuracy of measurement. The method includes a test pumping of fluid by the pump and measuring the static level in the well prior to the operation of the pump. The pumping fluid is produced in the regime, clearly exceeds the flow rate of the well, for 8-10 minutes, simultaneously measure dynamic fluid level. After stopping the pump, measure the recovery time of a static level. The magnitude of the flow rate is determined by the volume of fluid injected between the static and dynamic levels, calculated using the a priori known dimensions of the casing and pumping pipes, related to the recovery time of the static level.

The invention relates to the control of technological parameters of oil wells and can be used in automatic control systems of technological modes of production from marginal wells.

There is a method of determining the flow rate in the well by periodically filling and new devices [Abdullaev, A. A., Nabiev, I. A. automatic telemetering of oil wells. - Baku, 1963, S. 56-52].

The disadvantage of this method is the complexity of its implementation, requiring bulky equipment that contains at least two dimensional alternately filled and emptied containers, weighing device, system calculations, etc. that reduces reliability and increases the measurement error.

The closest in content operations to the claimed method is the determination of the dynamic fluid level in the well, which was adopted as a prototype [and.with. The USSR № 787626, CL E 21 In 47/04, 1980. The method of determining the dynamic liquid level in the well].

The disadvantage of this method is the complexity of its implementation by performing additional operations pumping fluid, measurement of flow rate and static level, which reduces the reliability and accuracy of the measurement.

Task - simplifying way, improving the reliability and accuracy of measurement.

The solution of this problem is achieved in that in the method of determining the flow rate of the wells are equipped with deep-well pump, including test pumping fluid pump and metering static level in the well to which it bore, within 8-10 minutes, simultaneously measure dynamic fluid level, after stopping the pump, measure the recovery time of the static level, and the magnitude of the flow rate determined by the formula:

where D is the inner diameter of the casing;

d - outer diameter of the pumping tube;

HDean- dynamic level of the well fluid;

Harticle- static level of the well fluid;

tin- the recovery time static level.

The proposed method is implemented as follows.

In the annulus is lowered downhole sensor, which is fixed static liquid level. Then include a subsurface pump and within 8-10 minutes siphon off the liquid, after which the pump off and fix the dynamic fluid level. Simultaneously with the disabling of the pump include a time counter, which determines the recovery time static level. Using a priori known dimensions of the casing and pumping pipes calculate the volume of liquid enclosed between the static and dynamic levels. Attributed to the time of filling this volume is the production of the well.

who has deep pump of any type - centrifugal or rod. As the sensor can be used for electric-indicator liquid level. The functions of the fixing fluid levels at the beginning and end of the measurement, timing and calculates the desired flow rate is performed using the microprocessor.

Compared to known methods to determine the rate of the proposed method has the following advantages:

- ease of implementation, due to the use of known devices that do not require special equipment that improves process reliability;

the measurement is made under conditions well in the natural environment that improves the accuracy of measurements;

- does not require special manufacturing operations, all measurements are made by changing modes of standard equipment, which increases the reliability and efficiency measurement.

The method for determining the flow rate of the wells are equipped with deep-well pump, including test pumping fluid pump, metering static liquid level in the well prior to the operation of the pump, characterized in that the pumping well fluid is produced in the regime, clearly exceeds the flow rate of the well, for 8-10 min, static level, and the magnitude of the flow rate is determined by the formula

where D is the inner diameter of the casing;

d - outer diameter of the pumping tube;

- dynamic level of the well fluid;

- static level of the well fluid;

- the recovery time static level.

 

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