The method for determining the flow rate of oil wells

 

The invention relates to the oil industry. The technical result of the invention is to reduce measurement error, reduce the impact on changes in modes of operation of the well and the disturbance of the flow of gas-liquid mixture (SHC), increasing reliability and reducing the cost of implementation of the method. This method enables the production flow bore in the form of SHC sealed in a calibrated measuring container (S) through the inlet line and push it into the flow line through the separating piston (RP) during its reciprocating movement under the pressure of the incoming SHC from opposite sides of the OIA, the fixing position sensors RP and signal transmission to the control unit in its approach to one end of S, counting the number of portions of the liquid phase when multiple continuous cycles and the calculation of volume and mass of her separate water and oil. And before you begin S mounted on eccentric with respect to its axis horizontally mounted tubular axis with the possibility of circular rotation. Shifting the center of gravity S, it is set to the weight sensor fixing the total weight of the measuring container with a piston fixed it value SHC, and transfer Eres ends installed eccentric axis. Before serving SHC in THEIR previously passed through the filter. And measurement activities are carried out without prior separation of the gas in the measuring vessel. The inner surface of THEIR pre-cover composition for preventing deposition of paraffin. In the control unit before you begin pre-make a lot with THEIR RP, its volume and the density of oil and water, as known constants for a given oil field, including the algorithm for calculation of flow rate, separately for oil and water. As RP use elastic ball made of elastic material. For wells with a large flow rate, for example, from 50 to 100 tons or more per day of THEIR choosing U-shaped or toroidal shape. 4 C.p. f-crystals, 2 Il.

The invention relates to the oil industry, and in particular to methods of determining the flow rate of oil wells without prior separation of the gas from the production wells.

There is a method of determining the oil wells of the fluid [1], in which a gas-liquid mixture (SHC) from wells is directed to measuring the calibration vessel in which it is subjected to separation, measured hydrostatic drive timing of the filling of the measuring calibrated capacity upon reaching the gas-liquid mixture of fixed levels, shut off the supply of SHC in the measuring gauge capacity, carry out the reset of the measuring vessel, and the flow of crude oil well fluid in mass units of consumption is determined by the difference between the hydrostatic pressure and the time of filling of the measuring vessel. Thus the difference between the hydrostatic pressures define between their values, fixed upper and lower hydrostatic pressure transducers.

Not begging advantages of this method, note that it is prolonged due to the allocation of gas from SHC. In addition, the gas to separate completely in downhole conditions is not possible.

Also knownA method of measuring the flow rate of oil wells and device for its implementation[2], including the production flow bore in the form of a gas-liquid mixture (SHC) in calibrated measuring vessel, the removal from it of the SHC moved under the action of SHC piston in the flow line at the approach of the piston to one end of the measuring vessel, fixing the position sensor of the piston and the transmission signal computing unit in the form of a microprocessor (controller), counting down the time papapavlou thread i.e. filing SHC on the other end of the measuring vessel through the inlet line and closing of the electromagnetic valves and the processing of measurement results for a given algorithm and the program computing unit, where pre-enter the density of oil and water is pre-known values for this field (prototype).

Its disadvantage, as with analogue, is the long duration of measurements, which is associated with the operation of gas separation, it does not provide sufficient reliability and accuracy because they are not provided pre-treatment products well before feeding it into the measuring container. In addition, the definition of hydrostatic pressure in the production well at a vertical position of the measuring capacitance causes a number of difficulties associated with accurate centering it relative to the vertically installed axis, with the increasing complexity of its construction and the need for the use of complex equipment.

The present invention is to remedy these shortcomings.

The problem is solved by the described method, including the production flow bore in the form of a gas-liquid mixture (SHC) in caliber the calculating of the piston during its reciprocating movement under the pressure of the incoming SHC from opposite sides of the measuring tank, fixing the position sensors of the piston and the signal transmission to the control unit in its approach to one end of the measuring container, counting the number of portions of the liquid phase when multiple continuous cycles and the calculation of volume and mass of her separate water and oil.

What is new is the fact that before you begin measuring capacity mounted on eccentric with respect to its axis horizontally mounted tubular axis, with the possibility of circular rotation, and shifting the center of gravity of the vessel, it is set to the weight sensor, for example, on the load cell for fixing the total weight of the measuring container with a piston fixed it value SHC and transfer it in the form of an electrical signal to the memory control unit, the supply of SHC in measuring the capacity and release it passes through the ends of the installed eccentric axis, and before serving SHC in measuring its capacity pre-filter, and measurement activities are carried out without prior separation of the gas in the measuring vessel, while its inner surface pre-covered with a composition for preventing deposition of paraffin.

Furthermore, the method is also different in that the control unit before n and water as a known constant values for a given oil field, including the algorithm to calculate the flow rate, separately for oil and water, and as the separating piston use elastic ball made of elastic material, and for wells with large flow rate, for example, from 50 to 100 tons or more per day measuring the capacity of choosing a U-shaped or toroidal shape.

Presents drawings explains the essence of the invention, where Fig.1 shows schematically an installation for implementing the method, a General view of Fig.2 is a view of a of Fig.1, in partial section.

System for measuring the flow rate of the oil well comprises a sealed and calibrated measuring container 1 has a cylindrical shape, covered inside the structure to prevent the deposition of paraffin, posted by dividing piston 2 in the form of a ball made of an elastic material. The capacity can be made and other forms, for example, U-shaped or toroidal. At the end portions of the tank outside installed sensors 3 and 4 the piston position. Measuring capacity is mounted on the metal base 5 by means of two bearings 6 and 7 horizontally on the tubular axis 8, the eccentric is installed relative to the vessel axis, and fixed to the ends of the flanges 9 and 10. Axis 8 consists of Durmast has the ability circular rotation, and it is equipped with a weight sensor such as a load cell 12, is electrically connected with the control unit 13 includes a controller 14 (CPU) and a display 15. The plant is equipped with a filter 16 for cleaning wells from mechanical impurities, established on line 17 supply wells in the form of a gas-liquid mixture (SHC) in the flow switch is made in the form of valve 18 to the actuator 19. Line inlet and outlet 20 and 21, which are used interchangeably when alternating the supply of SHC in the measuring tank is mounted with the possibility of message flow line 22 through the control valve 18. Line inlet and outlet 21, respectively hydraulically connected with the tubular eccentric axis. The load cell 12, the actuator 19 of the valve and the sensors 3 and 4 position of the piston is connected by means of an electrical connection 23, 24 and 25, respectively, to the control unit 13.

Installation if necessary, can be equipped with a hygrometer 26 and can be performed in a stationary or mobile version. In the latter case it is mounted on the vehicle chassis typeGAZ-3308and its capacity while performing a U-shaped or toroidal formee.

The method is as follows.

Before working in the memory control unit 13 (see Fig.1) enter the following data: mass measuring capacitance with the piston, its volume as constant values, and the density of oil and water as a known value for a given oil field.

Next, the measuring container 1 by turning the shift from the center of gravity and mounted on the load cell 12, as shown in Fig.2. Production wells in the form of a gas-liquid mixture enters the filter 16 through line 17, cleaned from mechanical impurities in the valve 18, thence through one of the inlet lines 20 or 21 to one end of the measuring vessel through the tubular axis 8, an eccentric mounted about its axis, without prior separation of the gas. Under the action of pressure SHC separating piston 2 begins to move in the forward direction. From that moment on, for example, the sensor 3 when the piston 2 will be in the area, sends a signal to the control unit at the beginning of the countdown. It is moving, at the same time begins to displace previously located there SHC in the flow line 22 through line 21 and valve 18 and the achievement of dividing the first measurement cycle ends, and the load cell 12 sends a signal to the control unit 13, whereby it determines the total mass of the SHC with measuring capacity by a predetermined algorithm (program). At the same time actuates the actuator of the valve and the latter switches the flow of the SHC on another line 21, through which SHC is supplied to the other end of the measuring capacitance, then the cycle repeats. So automatically the valve alternately changing the direction of flow in the continuous mode, is the repeated cycle of measurement of the flow rate of the well. When determining the mass flow of SHC in the memory of the control unit, enter the following mathematical expression:

where MW- mass flow rate of SHC by the average value over several measurement cycles, kg (ton);

Mto- mass measuring capacitance, a constant, kg;

Mt- weight calibrated measuring liquids, recorded at the moment of actuation of the position sensor;

TCthe time of passage of the piston inside the tank from one end to the other, hour (minimum);

TC=T2-T1,

t1, t2- the start and end of a measurement cycle, satiksme the formula:

where Winthe water content in the oil, with the average value in %.

In the absence of the layout of the installation of the hygrometer used in the calculations of the coefficient of windefined by lab results entered into the memory of the controller as the setpoint;

nis the density of the oil, t/m3;

inis water density, t/m3.

To determine the gas flow in the controller memory if necessary, enter the following formula:

Vgthe gas flow rate, m3;

Vto- volume of the measuring vessel, the m3;

VW- the volume of liquid in the measuring vessel, m3,

When a small volume of the measuring vessel, for example 50-60 l, because of the small gas content in the calculation of the flow rate can be neglected.

To reduce the error of measurement of works the inner surface of the measuring vessel cover structure for preventing the deposition of paraffin, and as a separation device using a ball of elastic material. DL is or toroidal shape.

Techno-economic benefit of the proposal is the following: the method allows to reduce the measurement error, to reduce the impact on changing modes of operation of the well and the disturbance of the flow of gas-liquid mixture, to increase the reliability by reducing the number of nodes and elements of the measuring device and to reduce the cost of implementation of the method, which is carried out in a fully automatic mode.

Literature used:

1. RF patent №2183267, 7 E 21 In 47/10, B. I. No. 16, 2002

2. RF patent №2069264, 6 E 21 In 47/10, B. I. No. 32, 1996 (prototype).

3. RF patent №2059067, 6 E 21 In 47/10, B. I. No. 12, 1996

Claims

1. The method for determining the flow rate of oil wells, including production flow bore in the form of a gas-liquid mixture (SHC) sealed in a calibrated measuring container via the inlet line and push it into the discharge line with the separation of the piston during its reciprocating movement under the pressure of the incoming SHC from opposite sides of the measuring vessel, fixing the position sensors separation device and the signal transmission to the control unit in its approach to one end of the measuring container, counting the number and oil, characterized in that before you begin measuring capacity mounted on eccentric with respect to its axis, horizontally mounted tubular axis, with the possibility of circular rotation and shifting the center of gravity of the vessel, it is set to the weight sensor such as a load cell for fixing the total mass of the measuring capacitance with a dividing piston fixed it value SHC, and transfer it in the form of an electrical signal to the memory control unit, the supply of SHC in measuring the capacity and release it passes through the ends of the eccentric installed tubular axis, and before serving SHC in measuring its capacity pre-filter, when this measurement activities are carried out without prior separation of the gas in the measuring vessel.

2. The method according to p. 1, characterized in that the inner surface of the measuring containers pre-cover composition for preventing deposition of paraffin.

3. The method according to p. 1, characterized in that the control unit before you begin pre-make a lot of measuring capacitance with a dividing piston, its volume and the density of oil and water, as known constants for a given oil complex, trichosis the fact that as a dividing piston use elastic ball made of elastic material.

5. The method according to p. 1, characterized in that for wells with large flow rate, for example 50 to 100 tons or more per day, measuring the capacity of choosing a U-shaped or toroidal shape.



 

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