RU2057922C1 - Set for measuring productivity of wells - Google Patents

Abstract

FIELD: oil production. SUBSTANCE: set for measuring productivity of wells includes two identical measuring vessels intercommunicating with the aid of pipe-lines located in their upper and lower parts. Vessels are equipped with differential manometers to measure levels of liquid and hydrostatic pressure of liquid column. Set provides for simultaneous measurement of quantities of liquid and gas and water content. EFFECT: increased reliability and precision of measurements. 1 dwg

Description

 The invention relates to the oil refining industry and can be used to measure the volume of liquid, free gas and water cut of well products in the study of wells. The volumes of oil, gas and water extracted from the reservoir are the main indicators of the operation of oil refining wells.

Known meter installation type flow meter DPN containing a measuring tank, a switching valve, electromagnets, a micro switch and a secondary device for recording flow rate (flow) of a liquid [1]
The disadvantage of this technical tool is the low reliability of the installation due to the complex design, the presence of an electromechanical switching valve, triggered by the limit level sensors of the command control system of the switching valve.

The closest technical solution to the invention is a device for measuring the production of oil wells, containing a cylindrical container, inside which there is a separation chamber with a separating head and a receiving pipe and a measuring chamber with a separating head and a receiving pipe and a measuring camera with a hydrostatic pressure sensor and a slit flow meter, and between the separation and measuring chambers an additional chamber is placed, which is connected to the measuring chamber by means of a siphon pipe [2]
The disadvantage of this device is its low accuracy and narrow functionality. A large error arises due to technological outages during the processing of the slit, a small amount of hydrostatic pressure and periodic pumping of liquid by blocking the gas outlet from the tank. In addition, this design of the device has a large inertia in gas and does not allow to measure the amount of gas and water in the production of wells.

 The purpose of the technical solution is to expand the functionality and ensure the measurement of the amount of oil, water and gas, increase the reliability and accuracy of measurement.

 This goal is achieved in that the measuring capacity is made in the form of two identical measuring cylinders, communicated in the upper and lower parts of the pipelines and equipped with sensors of the upper and lower levels, and the separation tank is made in the form of a separate unit, one output of which is communicated with a pipeline connecting the measuring cylinders in the upper part, and the other through a flow switch with a pipeline connecting the measuring cylinders in the lower part.

 The implementation of the measuring tank in the form of identical cylinders, communicated in the upper and lower parts with pipelines, allows free flow of gas.

 The supply of measuring cylinders with sensors of the upper and lower levels, which are used as diaphragm differential pressure gauges, increases the reliability of the installation and the accuracy of the measurement.

 The drawing shows the proposed installation.

 The installation contains two identical measuring vessels 1 and 2, the upper parts of which are connected between each other by a pipeline 3, and the lower parts by pipelines 4 and 5 with a flow switch 6 connected to the output highway 7, with the input highway 8 through the jumper 9 with the valve 10 and with the lower part of the separator 11 through the jumper 12 with the valve 13. In the pipeline in front of the flow switch is a temperature sensor 14 of the medium to be measured, and a pressure gauge 28 is installed on the pipe 3. The separator 11 is connected to the pipe 3 through the valve 16 and the input master Alley 8 through the valve 17, and is also equipped with a level regulator 15.

 The sensors of the upper level 18 and 19 and the lower level of 20 and 21 are installed on the measuring tanks 1 and 2. The hydrostatic pressure transducers (Sapphire-22DG) are used as level sensors, therefore the upper and lower sensors for each measuring tank are connected by equalizing tubes 22 and 23 s condensate collectors 24 and 25 and valves 26 and 27.

 Installation works as follows.

 The installation is connected to the measurement by opening the valves 13, 16 and 17. In this case, the production of the well through the input line 8 through the open valve 17 enters the separator 11, from where the liquid through the valve 13 and through the pipe 12 and the flow switch 6 enters one of the measuring tanks, as shown in the figure, into the measuring tank 2. At this time, gas from the separator 11 through the valve 16 and the pipe 3 enters the measuring tank 1, which through the pipe 4 and the flow switch 6 is connected to the output line 7.

As it fills, the liquid level in the measuring tank 2 rises, and when the set lower level is reached, the lower level sensor 21 provides an appropriate output signal, and when the set upper level of the liquid is reached, the upper level sensor 23 provides an appropriate output signal (defined current value). According to the signal of the upper level sensor, when the liquid reaches the upper set level, a command is given to turn on the drive, the switch plug rotates by 90 ^° , and the liquid begins to flow into the measuring tank 1, and the liquid from the measuring tank 2 is displaced by the free gas located in the measuring tank 1 and entering from the separator 11.

 The process of alternately filling and emptying the measuring vessels is repeated as many times as necessary.

 When the set upper liquid level is reached, the lower sensor in the same measuring capacitance generates a signal corresponding to the hydrostatic pressure of the liquid column with a height equal to the distance between the upper and lower liquid levels.

 With each filling and emptying of the measuring tanks, the time of liquid level change from lower to upper and from upper to lower levels is measured. The time is measured by the microprocessor controller using the signals of the lower and upper level sensors.

где V вместимость измерительной емкости между постоянно установленными нижним и верхним уровнями жидкости, м³;
τ_ж время заполнения объема V, сут.According to the measurement results, the microprocessor controller according to a given program and the following algorithm calculates the quantitative parameters of the flow components:
1) the flow rate (m ³ / day.) Of liquid Q _W is determined by the formula
Q _w =

where V is the capacity of the measuring capacitance between the permanently installed lower and upper liquid levels, m ³ ;
τ _{W the} time of filling the volume V, days.

-1 где Г_ф газовый фактор жидкости;
τ_г время опорожнения измерительной емкости вместимостью V, сут. при нормальных условиях газовый фактор Г $\genfrac{}{}{0ex}{}{\text{н}}{\text{ф}}$ определяется
Г $\genfrac{}{}{0ex}{}{\text{н}}{\text{ф}}$ Г_ф•

где Р_р абсолютное давление газа в условиях измерения, Па;
Т_р температура газа, К;
К коэффициент сжимаемости газа;
3) расход газа Q_г определяется по формуле
Q_г Q_ж ·Г_ф;
4) обводненность нефти W определяется по формуле
W

об.доля где ρ_см плотность смеси нефти и воды, кг/м³;
ρ_в плотность воды, кг/м³;
ρ_н плотность нефти, кг/м³.2) the gas factor, as the ratio of gas flow to liquid flow under operating conditions, i.e., at R _p and T _p , is determined by the formula
R _f

-1 where G _{f the} gas factor of the liquid;
τ _{g the} time of emptying the measuring capacity with a capacity of V, days under normal conditions, gas factor G $\genfrac{}{}{0ex}{}{\text{n}}{\text{f}}$ determined by
G $\genfrac{}{}{0ex}{}{\text{n}}{\text{f}}$ G _f •

where P _{p the} absolute gas pressure in the measurement conditions, Pa;
T _p gas temperature, K;
K gas compressibility factor;
3) gas consumption Q _g is determined by the formula
Q _g Q _w · G _f ;
4) the water cut of oil W is determined by the formula
W

about. share where ρ _{cm the} density of the mixture of oil and water, kg / m ³ ;
ρ _{in the} density of water, kg / m ³ ;
ρ _{n the} density of oil, kg / m ³ .

где ΔР гидростатическое давление столба жидкости высотой Н, МПа;
Н расстояние между верхним и нижним уровнем, м;
g ускорение свободного падения, м/с².The density of the mixture ρ _cm is determined by the formula
ρ _cm

where ΔР hydrostatic pressure of a liquid column with a height of N, MPa;
N distance between the upper and lower levels, m;
g acceleration of gravity, m / s ² .

During the operation of the installation, the parameters τ _W , τ _g and ΔP are automatically measured. The remaining parameters are constant and are entered into the program for calculating and processing the measurement results in advance and are periodically adjusted if necessary.

 The proposed design implementation of the measuring installation provides a consistent communication of the measuring tanks with the inlet and outlet pipelines when the liquid reaches the established upper level in the measuring tanks, gas flows from one measuring tank to another when the liquid is displaced and the incoming gas leaves the liquid, while determining the amount of liquid, gas and water content by ensuring registration of filling time, emptying time and hydrostatic pressure I have liquids in measuring tanks.

 Diaphragm differential pressure gauges were used as liquid level sensors, and the lower level sensor also serves to measure the hydrostatic pressure of the liquid between the lower and upper levels in the measuring tanks.

 Such a measuring installation is equipped with a microprocessor controller, which provides the reception of signals from level sensors, pressure, thermometers, control of the flow switch, counting the time for filling and emptying the measuring tanks, calculating the number of flow components according to a certain algorithm and the operation of the installation according to a given program.

 The proposed installation of a more technologically advanced design has smaller overall dimensions and wide functionality: at the same time, the amount of liquid, gas, and water content in the well production are measured with sufficient accuracy in continuous mode. The measurement is carried out with a small amount of free gas without using a pump to free the measuring tanks from the liquid.

Claims (1)

 INSTALLATION FOR MEASURING WELL PRODUCTS, comprising a separation tank and a measuring tank with a hydrostatic pressure sensor, characterized in that the measuring tank is made in the form of two identical measuring cylinders communicated in the upper and lower parts by pipelines and equipped with sensors for upper and lower liquid levels, and a separation tank made in the form of a separate unit, one output of which is connected to the pipeline connecting the measuring cylinders in the upper part, and the other through a switch flow to a conduit connecting the measuring vessel at the bottom.

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