Device for measuring the flow rate of oil wells

 

The invention relates to the oil industry, namely the means to automatically measure the mass flow of fluids produced from oil wells, its volume flow, density, moisture content and flow of free gas. The technical result of the invention is to improve the measurement accuracy and reliability by simplifying the design, reducing metal and reducing the time. The installation includes a sealed cylindrical container placed inside of the separating piston, the position sensors of the piston mounted on the end of its parts, switches flow, the inlet and outlet lines, the control unit and the connecting pipes. Moreover, the capacity installed on horizontal tubular axis, installed eccentric relative to the Central axis, rigidly attached to the flanges of the container and mounted on ball-bearings, and provided with a weight sensor, electrically connected with the control unit. Line intake and output well in communication with the tubular installed eccentric axis, communicated with the cavity of the vessel. However, the installation is equipped with a filter for purifying wells from mechanical impurities, the mouth of the drive, connected electrically to the control unit, for automatic alternate feed production well in a container. The inner vessel wall coated with the composition for preventing deposition of paraffin. Line intake and production wells in the tank is mounted with the possibility of message flow line through the control valve. The separating piston is made in the form of an elastic ball. 2 C.p. f-crystals, 2 Il.

The invention relates to the oil industry, namely the means to automatically measure the mass flow of fluids produced from oil wells, its volume flow, density, moisture content and flow of free gas.

A device for measuring the production wells [1], containing a sealed cylindrical container provided with inlet and outlet pipelines wells for gas and liquid respectively, having managed the locking elements, the power Converter into an electric signal, and a computing unit, hydraulic and electrical control systems.

It is also known a device for measuring the production wells [2], containing Gaza and liquid, having managed off bodies, the power Converter into an electrical signal with the piston and connected computing unit, hydraulic and electrical control systems. When this sealed cylindrical container made with centering support located along its vertical axis, and mounted concentric cylindrical her guide.

A common disadvantage of the known devices is the complexity of the structural design and great intensity. In addition, they must strictly observe the symmetry in relation to the center of gravity. Violation of the symmetry leads to imbalance measuring mass (converters force into an electrical signal) and therefore to the appearance of additional uncontrolled errors, which reduces the accuracy of measurement of liquid mass.

These drawbacks are partially eliminated in the device for measuring flow rate [3], which is the technical nature more close to the offer and may be taken as a prototype.

It includes a sealed cylindrical container placed inside of the separating piston, the position sensors of the piston mounted on the end of it >p>The disadvantage of the prototype is also the complexity of the design, great intensity, and unnecessarily costly, time-consuming to determine flow rate associated with the determination of the gas flow.

The present invention is to provide a setting for measuring the flow rate of oil wells with high accuracy, low metal content, simple design and does not require time-consuming when determining well yield.

The problem is solved by the described installation, comprising a sealed cylindrical container placed inside of the separating piston, the position sensors of the piston mounted on the end of its parts, switches flow, the inlet and outlet lines, a control unit and connecting lines.

What is new is that the tank is installed on the horizontal tubular axis, installed eccentric relative to the Central axis, rigidly attached to the flanges of the tank, and mounted on ball bearings, with line intake and output well in communication with the tubular installed eccentric axis, communicated with the cavity of the vessel, and provided with a weight sensor, for example, a load cell, elektroehniceskij impurities, mounted on the supply line of production wells in the flow switch is made in the form of a valve actuator connected electrically to the control unit, for automatic alternate feed production well in a container.

New is also that the inside of the vessel wall coated with the composition for preventing deposition of paraffin, and the lines of intake and production wells in the tank is mounted with the possibility of message flow line through the control valve, thus separating piston is made in the form of an elastic ball.

Drafts poyasnyaet the essence of the invention, where Fig.1 schematically shows a device for the measurement of flow rate of oil wells; Fig.2 is a view of a of Fig.1, a partial cut.

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 the sensors 6 and 7 horizontally on the tubular axis 8, eccentric is installed relative to the vessel axis, and fixed to the ends of the flanges 9 and 10. Axis 8 consists of two parts mounted on the ends of the flanges 9 and 10 and mounted on the bearings 11 of the supports 6 and 7. Thus, the capacity has the ability circular rotation, and it is equipped with a weight sensor, for example, 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, may be the chassis of a car “GAZ-3308”, and its capacity while performing a U-shaped or toroidal shape. This vessel form is convenient in transportation and in the measurement of the flow rate from 50 to 100 tons per day or more.

The device operates as follows.

Before working in the memory control unit 13 (see Fig.1) enter the following data: weight of the measuring container, 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 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, if the piston 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 vykdanciu 4, the latter sends a signal to the control unit at the end of the countdown. Thus, 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 vessel, and 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);

Mtoweight measuring capacity with separating piston, 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 capacity from the outset and end of a measurement cycle, recorded by the controller.

To determine the volumetric flow rate of fluid in the computing unit enter the following formula:

where winthe water content in oil, daily value, %.

In the absence of linkage installation hygrometer, in the calculations used 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:

where 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.

Technical appraisal and economic benefits of the proposal are as follows:

Installation is not metallosita, that provides improved reliability of its operation and the reduction in time, reducing the cost of implementation and measurement of works. The number of wells connected to the unit can be from 1 to 14. Submission of SHC in the measuring container via an eccentric mounted axis provides a more accurate measurement.

Preliminary field tests of the installation have shown positive results.

Sources of information

1. A. C. the USSR №1652521, M CL E 21 In 47/00, 1991

2. Patent R. F. No. 2059067, M. CL. E 21 In 47/10, 1996

3. Patent R. F. No. 2069264, M CL 6 E 21 In 47/10, B. I. No. 32, 96, (prototype).

Claims

1. Device for measuring the flow rate of oil wells, comprising a sealed cylindrical container placed inside the dividing piston position sensors piston mounted on the end of its parts, switches flow, the inlet and outlet lines, a control unit, flow line and connecting lines, characterized in that capacity mounted on horizontal tubular axis, installed eccentric relative to the Central axis, rigidly attached to the flanges of the container and mounted on ball bearings, with line release and the inlet and provided with a weight sensor, electrically connected with the control unit, the installation is equipped with a filter for purifying wells from mechanical impurities installed on the supply line of production wells in the flow switch is made in the form of a valve actuator connected electrically to the control unit, for automatic alternate supply wells in the tank, and the line release and intake wells in the tank is mounted with the possibility of message flow line through the valve.

2. Installation under item 1, characterized in that the inner vessel wall coated with the composition for preventing deposition of paraffin.

3. Installation under item 1, characterized in that its separating piston is made in the form of an elastic ball.



 

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