RU2513891C1 - Oil well gauging device - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: device consists of a vertical cylindrical vessel, input and output liquid lines made in the form of siphon pipe, a gas line, gas-phase pressure and temperature gauges, a computing element. Volume displacement metre and a stop valve are installed in the common line, one by another, before the line entry into the collecting reservoir, at that the gas line and the output liquid line connected by downward siphon pipe are communicated with hydraulic lock. Pressure and temperature gauges are installed in the gas line; the stop valve, the volume displacement metre and the computing element are interconnected through a pulse distributer for measurement of the working medium. The stop valve is a bypass valve of step-by-step action with magnetic locking, discharge and control of positions - open and closed.

EFFECT: improving accuracy and quality of well gauging.

2 cl, 1 dwg

Description

The invention relates to the oil industry and can be used to measure the flow rate of wells.

A device for measuring the flow rate of wells (AS USSR No. 577290, class ЕВВ 47/00, 10/25/1977), containing a gas separator with a float associated with the valve on the gas line, hydraulically connected to the gas and liquid lines, counter fluid, a spring-loaded valve with a stem, equipped with locking elements that are installed with the possibility of interaction with the stem of the diaphragm valve.

A disadvantage of the known device is the unreliability of its operation.

A device for measuring the flow rate of wells (AS USSR No. 1530765, class ЕВВ 47/10, 12/23/1989), containing a gas separator with a float associated with a valve on the gas line, a liquid meter pneumatically connected to the gas line, and a membrane valve hydraulically connected to the common line with a stem, configured to be installed in two extreme fixed positions, the device is additionally equipped with a valve installed on the gas line parallel to the damper, configured to be installed in two extreme fixed applications by a membrane valve with a stem and a throttle, and the supmembrane cavity is connected to the gas line after it and the throttle.

A disadvantage of the known device is the unreliability of its operation, due to the presence of a membrane at the valve, which has a significantly limited resource and mechanical strength. Another disadvantage is the presence of impulse tubes through which the diaphragm valve controls the pressure drop between the separator and the common manifold. The impulse tubes are constantly filled with condensate, and at negative temperatures, the condensate in the impulse tubes freezes and the device fails.

In addition, the design of the locking elements is made using ball retainers, which suggest the presence of sliding friction, which causes wear of the rubbing surfaces and the failure of the device itself for measuring the flow rate of wells. Moreover, the locking elements are installed in the normal pressure range, and the valve stem is located in the operating pressure range, which involves the use of stuffing box devices, which also have a very limited resource and which also requires significant operating costs.

The presence of a large number of rubbing parts in the design of their clamps ultimately leads to increased wear, which affects the change in the characteristics of the valve fixation and the valve stops working in fixed extreme positions, begins to remain in an intermediate position, in a half-open (half-closed) position, which leads to distortion of the results of measuring the flow rate of wells.

A device for measuring the flow rate of wells (RF patent No. 2199662, ЕВВ 47/10, 02/27/2003), containing a gas separator with a float associated with a valve on the gas line, hydraulically connected to the gas and liquid lines, a liquid meter, a spring-loaded valve with a rod equipped with locking elements installed with the possibility of interaction with the rod, valve seat, throttle, the rod is equipped with a washer of magnetic material located between the ring magnets installed in the magnetic circuits, rigidly attached to the housing Apana, interacting with the washer when moving the rod, and the throttle is installed in the passage section of the valve seat and is rigidly connected to the latter.

A disadvantage of the known device is the error in the issuance of information on the flow of fluid after closing the shut-off valve.

A device for measuring the flow rate of oil wells (AS USSR No. 1553661, ЕВВ 47/10, 03/30/1990), containing a vertical cylindrical separator with a jet ski, two pressure sensors, one of them measures the pressure of the liquid phase, installed at different gas levels a line with a valve with an electromagnetic actuator, inlet and outlet liquid lines, a microprocessor and a control unit, soothing grids, pressure and temperature sensors that measure the parameters of the gas phase, and the outlet liquid line is made in the form of a siphon. The known device has a complex and unreliable design:

- valve with electromagnetic actuator and control;

- pressure and level sensors operating in a liquid medium, subject to the probability of failure due to their fouling with a layer of paraffin. A device for implementing a method for measuring the flow rate of associated gas in the production of oil wells in group metering units (AS USSR No. 276851, E21 B 47/10, 07/22/1970), including the supply of gas and oil flow into the separation ladder in the form of a cylindrical vertical tank and the accumulation of the liquid phase in it, its displacement by the pressure of the gas phase by shutting off the shutoff valve on the gas line and determining the gas flow rate by measuring the time of displacement of a given volume of the liquid phase, containing a vertical cylindrical container, sensors it and the upper levels, temperature and pressure sensors of the gas phase, a gas line, a calculating-decisive unit, an electronic clock, a shut-off valve, a liquid inlet and outlet, in the form of a siphon, a line.

The known device has disadvantages in that its design includes liquid level sensors, confirmed by the risk of failure due to their overgrowth with a layer of paraffin, and is devoid of instruments that continuously measure the flow rate of the liquid and gas phases and allow for the production of wells to be taken into account in a given section time with high accuracy, direct way.

A device for measuring the flow rate of gas and liquid of oil wells (RF patent No. 2426877, E21B 47/10, 08/20/2011) containing a vertical cylindrical tank, inlet and outlet, in the form of a siphon, liquid lines, gas line, gas pressure and temperature sensors phases, calculating and decisive unit with an electronic clock, hydraulic lock communicating with the collector common line, volumetric liquid meter, shut-off valve made by self-acting, bypass, two-phase, discrete with magnetic fixation of its extreme positions Nij mounted as a counter to the common line after it before flowing it into a collection manifold, the gas outlet and liquid descending branch of the siphon line communicated with a lock, wherein the pressure and temperature sensors installed on the gas line.

A disadvantage of the known device is the lack of reliability and accuracy of the measurement results of the flow rate of wells, due to the issuance of information on fluid flow after closing the shutoff valve.

The specified disadvantage of the known device is manifested in various types of flow meters.

For example:

Inertia turbine meters (flow meters) continue to provide information on fluid flow after closing the flow control valve.

Coriolis flowmeters due to zero drift when the valve is closed (in the absence of fluid flow) provide information about the flow.

Ultrasonic, vortex, vortex-acoustic flowmeters in the absence of flow are very sensitive to vibration, hydraulic noises and with hydraulic and acoustic noises starts to give information about the flow in the absence of flow.

This device is closest to the invention in technical essence, achieved technical results and is taken as a prototype.

The objective of the invention is to simplify the design and increase the reliability of operation.

The technical result is to increase the accuracy of measuring the flow rate of the well due to the inclusion in the device of a pulse distribution unit for determining the measured working medium (gas or liquid) and a shut-off valve made by discrete bypass with magnetic fixation, unloading and position control.

The problem is solved and the technical result is achieved by the fact that in the device for measuring the flow rate of wells, containing a vertical cylindrical tank, inlet and outlet in the form of a siphon, liquid lines, gas line, pressure and temperature sensors, gas-counting unit, hydraulic lock, a common line that communicates with the collector collector, a volumetric liquid meter, a shut-off valve installed, like the meter, on the common line after it before it flows into the collector, and at the same time gas and outlet the fluid line is connected with a hydraulic lock to the descending branch of the siphon; moreover, the pressure and temperature sensors are installed on the gas line according to the invention, the shut-off valve, the volumetric liquid meter and the counting-decisive unit are interconnected via a pulse distribution unit for determining the medium to be measured, the valve is made bypass discrete action with magnetic fixation, unloading and position control: “Open” or “Closed”.

In addition, in the device for measuring the flow rate of wells, according to the invention, the measured working medium may be gas or liquid,

The technical essence of the invention is illustrated in the drawing.

The device contains a cylindrical vertical tank 1, input 2 and output 3 liquid lines, the output line 3 is made in the form of a siphon, a vertically descending branch 4 of which is connected with a hydraulic lock 5, its left entrance 6. A gas line 8 is vertically connected to the right input 7, on which are equipped with pressure sensors 9 and temperature 10. The output 11 of the lock 5 is connected to the collecting manifold 12 by a common line 13, on which a volumetric liquid counter 14, for example, a vortex type, is installed sequentially towards the collecting manifold 12 a, shut-off valve 15, made bypass discrete action with magnetic lock, unloading and position control: “Open” or “Closed”. The device also includes a counting-decisive block 16. The volumetric counter 14, a shut-off valve 15 and a counting-decisive block 16 are interconnected through a pulse distribution block 17 for determining the measured working medium (gas or liquid).

The device operates as follows: the gas-liquid mixture from the oil well enters through the inlet liquid line 2 into the tank 1, where it is naturally separated into the gas and liquid phases, the latter is accumulated in the tank 1 to level H, and the gas through the gas line 8 through the hydraulic lock 5 enters the common line 13 and then dumps it into the collecting manifold 12 through the counter 14 and the open shut-off valve 15. The pressure of the gas phase in the tank 1 drops to P _min and the valve 15 closes. The accumulation of the gas phase. Its pressure rises to P _max . Valve 15 opens. Thus, the pressure is maintained in the range of P _min -P _max necessary to displace the liquid phase accumulated in the tank 1. The liquid phase is poured from the output liquid line 3 along the descending branch 4 into the hydraulic lock 5, it locks the passage of the gas phase and rises along the gas line 8 to the level and is discharged through the outlet 11 through the general line 13 to the collection manifold 12 through the open valve 15. When the liquid passes instead of a gas valve 15, as a throttle, which limits the flow of gas or liquid phases through lines 2, 3, 8, 13, a hydraulic lock 5 and a counter 14, an upward pressure jump occurs, noted by the sensor 9, since the hydraulic resistance sharply increases valve 15 to the flow of the liquid phase, obviously larger in comparison with the resistance to gas flow. This marks the moment of the beginning of the displacement from the tank 1 of the liquid phase. The counter 14 measures and takes into account the flow rate of the liquid phase. When displacing the level of the liquid phase in the tank 1 falls to the mark h, also drops the level of the liquid phase in the gas line 8 to the mark h. Due to the siphon effect of the output liquid line 3, the liquid phase is displaced from the lock 5 and the descending branch 4 into the tank 1, and from the common line 13 into the collecting manifold 12. The passage of the gas phase to the liquid instead of the liquid opens and it is discharged into the collecting manifold 12 through an open valve 15. In this case, a downward pressure jump occurs, noted by the sensor 9 as the moment of the end of the displacement of the liquid phase from the tank 1. After this begins the accumulation in the tank 1 of the liquid phase. The levels of the liquid phase at the marks H and h determine the constant volume V _{0 of the} measurement, created by a special configuration of the mutual arrangement of the lines: output liquid 3, gas 8, total 13 and hydraulic lock 5.

The time of the displacement process and the time of the accumulation process, as the time between the processes of displacement, are measured by block 16 from the jumps in the pressure of the gas phase in the gas line 8, marked pressure sensors 9.

By the connection of the shut-off valve 15 with the volume counter 14 in the closed position of the valve 15, any readings of the counter 14 going to the counting-blocking unit 16 are blocked, since the volumetric counter 14, the shut-off valve 15 and the counting-solving block 16 are interconnected via a pulse distribution block 17 determination of the measured working medium (gas or liquid), receiving signals from a shut-off valve 15, made bypass discrete action with magnetic fixation, unloading and position control: “Open” or “Closed”, which ensures the fact a static measurement by the volumetric counter 14 of the fluid flow rate only if available, which increases the accuracy of measuring the flow rate of wells.

The use of the invention will improve the accuracy and quality of measuring the flow rate of wells, to create for this a simple and reliable device that does not require large economic costs for its creation and use, ensuring stable measurement of the flow rate of the well.

Claims (2)

1. A device for measuring the flow rate of wells, containing a vertical cylindrical tank, inlet and outlet in the form of a siphon, liquid lines, a gas line, gas pressure and temperature sensors, a counting and decisive unit, a hydraulic lock that communicates with the collector a common line, volumetric a liquid meter, a shut-off valve installed, like the meter, on the common line after it before it flows into the collection manifold, while the gas and liquid outlet downstream branch of the siphon line are connected with a hydraulic lock moreover, the pressure and temperature sensors are installed on the gas line, characterized in that the shut-off valve, volumetric liquid meter and calculating-decisive unit are interconnected via a pulse distribution unit for determining the measured working medium, and the shut-off valve is made bypass discrete action with magnetic fixation , by unloading and control of the situation: “Open” or “Closed”. 2. A device for measuring the flow rate of wells according to claim 1, characterized in that the measured working medium is gas or liquid.

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