Method and device for measuring the flow rate of oil

 

The invention relates to the field of oil and can be used to measure the flow rate of oil production wells. The method comprises feeding the gas-oil-water mixture into the measuring vessel, the division into gas and water-oil mixture (GNH), which is an emulsion, the measurement of the flow rate of the ANS on the fill rate of the calibrated part of this capacity and drain ANS with intervals determined by the flow rate of products specific well, the calculation of the amount of water and the fraction of oil in the liquid phase of these products on the measured density value of the ANS and known values of density of the reservoir water and degassed oil, and the subsequent calculation of the flow rate of oil. In addition to the calibrated section of the measuring vessel with a given periodicity fill ANS sucks the camera, stand in it a certain amount of time, then measure the density of a stand of ANS with the subsequent emptying of this camera. The exposure time determined by controlling the degree of destruction of the emulsion according to the intensity change of the output signal of the inverter density. The decline in the settling chamber in the process of destruction of the emulsion and separation from her gas to compensate, adding to it fresh emulsija the inlet pipe, measuring tank having in the upper part of the cavity separating element and equipped for level measurement or mass ANS one or more converters, hydrostatic pressure, outlet piping, fitted with a switch valve, and piping for successive removal from the measuring tank in the outlet piping of liquid and gas. Additionally, the device is equipped settling chamber made in the form of a vertical cylinder and equipped for measuring the density of the one or more transducers hydrostatic pressure, communicating with the measuring tank through the top and bottom, equipped with shutoff valves, pipelines. The invention improves the accuracy of measurement of flow rates in wells, the products of which forms a stable emulsion. 2 N. p. F.-ly, 1 Il.

The invention relates to the field of oil and can be used for measuring the quantity (flow rate) of oil in the liquid phase (water-oil mixture) production oil wells.

The known method and device [1] to measure the flow rate of oil through the filling of the measuring vessel of water-oil mixture from the bottom to the specified specified the water-oil mixture, determine the mass of “net” and the volume of the mixture, determine the rate of water-oil mixture in the speed of loading of the specified portions of the measurement by moisture percentage content of water, determine the percentage of oil in the mixture and to determine the rate of oil.

The disadvantage of this method is the complexity of the device for its implementation, low reliability and a large measurement error due to the presence of a large number of articulated pipes connecting the measuring tank, mounted on the scale, with the rest of the process equipment, low functional load of the individual elements of the device, resulting in a hardware redundancy and, consequently, the high cost of this device.

The closest to the technical nature of the claimed invention is a method of measuring the flow rate of oil that is implemented in the device [2], containing a vertical measuring capacity, calibrated part which is equipped with upper and lower level sensors, which are used converters hydrostatic pressure of the liquid column.

The known method is to periodically fill the calibrated section of the measuring escorena the density of water-oil mixture and the density of water and degassed oil, specific laboratory method of determining the share of oil in the mixture and flow rate of oil.

A disadvantage of the known method and device for measuring the flow rate of oil is limited scope - the inability to apply for wells with foamy carbonated oil, water-oil mixture which is a persistent, slowly collapsing emulsion.

Since the known method and apparatus involve the measurement of the flow rate of water-oil mixture, its density and, accordingly, the flow rate of oil in real time, the dynamics (i.e., the frequency of cycles and the speed of filling and emptying water-oil mixture measuring capacity) is the actual speed (magnitude) submission of product specific wells.

Therefore, when working on the wells with foamy oil the process of measuring the density of water-oil mixture in a known manner not give reliable results (emulsion does not have time to break down), resulting in a large measurement error of the flow rate of oil.

This objective is achieved in that in the measurement of the flow rate of oil through the feed gas-water-oil mixture in the measuring tank, the separation of gas and water-oil mixture, measurements of water-oil determined by the flow rate of products specific well, calculate the amount of water and the fraction of oil in the liquid phase of these products on the measured density value of water-oil mixture and the density of formation water and degassed oil, specific laboratory method and subsequent calculation of the flow rate of oil as the product of its share in water-oil mixture and flow rate of the mixture, according to the proposed method, in addition to the calibrated section of the measuring vessel, a water-oil mixture, which is the emulsion, at specified intervals fill the settling chamber, soak in it for some amount of time, while the exposure time determine, controlling the degree of destruction of the emulsion according to the intensity change of the output signal of the inverter density, then measure the density of distilled water-oil mixture with the subsequent emptying of the camera, and the reduction in the settling chamber in the process of destruction of the emulsion and separation from her gas, compensate, adding to it fresh emulsion when filling the calibrated section of the measuring vessel in the process of measuring the flow rate of water-oil mixture.

This objective is achieved in that the device for measuring the flow rate of oil, containing the inlet pipe, measuring eudafano one or more transducers hydrostatic column of fluid level measurement or weight of water-oil mixture, outlet piping, fitted with a switch valve and piping for successive removal of the measuring capacitance in the output pipeline gas and liquid according to the proposed device is additionally equipped settling chamber made in the form of a vertical cylinder and equipped with one or more transducers hydrostatic pressure of the liquid column density measurements, communicating with the measuring capacity with top and bottom equipped with stop valves pipeline.

A comparison of the proposed solutions to the prototype did not allow to identify in them the features distinguishing the claimed solution to the prototype that allows to conclude that the criterion of “substantial differences”.

Comparative analysis of the proposed solutions with the prototype shows that the inventive method and device for measuring flow rate of oil differ that eliminates the dependence of the accuracy of the density measurement of water-oil mixture and, accordingly, the flow of crude from its physical properties, in particular properties to form a stable emulsion when mixed with water and gas.

The possibility to control the degree of readiness of water-oil mixture for ismartono, flow rate not only foaming of the oil, but also ordinary oil with high gas factor.

Thus, the inventive method and device for measuring flow rate of oil meet the criterion of “novelty.”

The drawing shows a diagram of one embodiment of implementation of the inventive device for measuring the flow rate of oil.

In a device for implementing the inventive method of measuring the flow rate of oil enters the inlet pipe (1), the measuring vessel (2) having in its upper part of the separating element and is equipped with a Converter (3) hydrostatic pressure of the liquid column.

The upper part of the measuring capacitance is connected to a settling chamber (6) with gaseosas (5), which is horizontally positioned pipe, containing in its cavity package kapitbisig plates. Settling the camera is equipped with a Converter (7) hydrostatic pressure of the liquid column.

The structure of the device also includes pipelines (4) and (8) for removal of water-oil mixture from the measuring tank and a settling chamber pipe (10) for removal of gas, pass (9) and three (11) valves and outlet piping (12).

The method is as follows.

Gas-water-oil is separated into a liquid (water-oil mixture) and the gas phase.

The gas, after passing gatsushita (5), goes through a three-way valve (11) to the output pipe (12).

Water-oil mixture, separating from the gas gets to the bottom of the measuring vessel (2) and fills it.

When this water-oil mixture can't get either in the settling chamber (6), nor in the output pipe (12), as a passing valve (9) is closed, and a stop valve three-way valve (11) is located so that the outlet line is connected to the pipeline (10) and the pipe (4) is cut off from him.

After reaching the level of water-oil mixture sensitive element of the transducer (3) hydrostatic column of fluid in proportion to a further increase in the level begins to change the value of the output signal of this Converter.

When the level of the edges of gaseosas (5) water-oil mixture begins to flow in the settling chamber (6).

A sign of the start of the overflow (fill chamber 6) is to stabilize the value (this value is registered by the controller managing the process of measurement of the output signal of the Converter (3) and start changing the value of the output signal of the Converter (7).

Terminator fill the settling chamber is to synchronize changes (increased the sue stop valve three-way valve is switched to the position, when the pipe (10) is cut off and the pipe (4) connected with the outlet line.

When the gas accumulating in the upper part of the measuring capacitance, starts to push the water-oil mixture from the measuring vessel to the output pipeline, the level starts to decrease, the value of the output signal converters (3) and (7) simultaneously reduced.

After the fall of the level in the measuring vessel below the edge of gaseosas the value of the output signal of the Converter (7) is stabilized (controller registers this value and calculates the relative weight of the emulsion), and the value of the output signal of the Converter (3) continues to decline.

Upon reaching the output signal of the Converter (3) lower setpoint (it is determined and recorded in the memory controller in the calibration of the measuring capacitance) stop valve three-way valve to re-establish in the position in which the pipe (10) connected to the output pipeline, and the pipeline (4) is cut off from him, and again begins the cycle of loading of water-oil mixture in the measuring tank.

In the process of re-loading, after reaching the value of the output signal of the Converter (3) a certain value, the charge is as the upper setpoint, multiply this value by the conversion factor (the ratio of the mass), determined during calibration of the measuring vessel, and then by registering the speed of filling and emptying the calibrated section of the measuring capacitance between the lower and upper setpoints continue the process of measuring the flow rate of water-oil mixture and gas.

In the process of sludge water-oil mixture in the settling chamber, with the gradual destruction of the emulsion and separation of coagulated it gas, the increase in the value of its density, which is manifested by a monotonically changing value of the output signal of the Converter (7).

The increase in density is accompanied by a decrease in the level of water-oil mixture in the settling chamber, partially recovered by the liquid flowing from kapitbisig plates desiccant gas.

However, in order to be sure, that sucks Luggage full, periodically (or when each cycle of loading), the process of measuring the flow rate of water-oil mixture, the level in the measuring vessel is brought to the same value, at which the initial fill of the settling chamber.

The dwell time of water-oil mixture in the settling chamber (for specific oil) determine empirically, it predisposizione Converter (7) the controller calculates the relative density of water-oil mixture, water cut and flow rate of oil as described above.

At the end of this procedure, the controller until the onset of the next cycle draining of water-oil mixture from the measuring tank, opens the lock valve (9) and settling chamber is emptied together with her.

Then the cycle repeats.

The invention is illustrated in the results of measurements of flow rate of oil, the inventive method and device, at well # 6743 Bush No. 217 DANG OAO Yuganskneftegaz, YUKOS " oil company.

Density values of the emulsion was changed in the range of 0.57-0.64 in t/m3.

The density of distilled water-oil mixtures ranged 0,819-0,838 t/m3.

The exposure time of the emulsion in the settling chamber, after which stabilized the density of water-oil mixtures ranged 53,28-56,98 minutes.

Thus, the above example shows that when measuring the flow rate of foamy oil this well by the claimed method and device measurement accuracy improved by more than 20%.

Sources of information

1. RF patent №2059067.

2. Inventor's certificate SU # 1553661 A1 from 20.04.88,

Claims

1. A method of measuring the flow rate of oil, including filing gazoochistnoe mixture in smti fill the calibrated part of this capacity and discharge of oil-water mixture at intervals determined by the flow rate of products specific well, the calculation of the amount of water and the fraction of oil in the liquid phase of these products on the measured density value of oil-water mixture and the density of formation water and degassed oil, specific laboratory method, and the subsequent calculation of the flow rate of oil as the product of its share in the oil-water mixture and flow rate of the mixture, characterized in that, in addition to the calibrated section of the measuring tank, oil-water mixture constituting the emulsion, at specified intervals fill the settling chamber, soak in it for some amount of time, while the exposure time determine, controlling the degree of destruction of the emulsion according to the intensity change of the output signal of the inverter density, then measure the density of distilled water and oil mixture with the subsequent emptying of the camera, and the reduction in the settling chamber in the process of destruction of the emulsion and separation from her gas to compensate, adding to it fresh emulsion when filling the calibrated part of the measuring capacitance in the measurement process flow of oil-water mixture.

2. Device for measuring the flow rate of oil, containing the inlet pipe, the element and provided with one or more transducers hydrostatic column of fluid level measurement or weight of oil-water mixture, outlet piping, fitted with a switch valve, and piping for successive removal from the measuring tank in the outlet piping of gas and liquid, characterized in that it additionally arranged sucky camera, made in the form of a vertical cylinder and equipped with one or more transducers hydrostatic pressure of the liquid column density measurements, communicating with the measuring tank through the top and bottom, equipped with shutoff valves, pipelines.

 

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