Method of automatic adjustment of gas well operation mode

FIELD: oil and gas production.

SUBSTANCE: method includes gaslift well operation by adjusting the flow rate of working and produced gas. The withdrawal of produced gas is done by tubing string and additional tubing string. The flow rate of working and produced gas is adjusted by opening and closing of driven shut-off elements in accordance to the control signals. Control signals come from automatic control unit and are generated according to the results of measured values compared with set parameter values. Note that the pressure is measured in the mouth and bottom hole, at the same time the flow rate of produced gas is measured. The flow rate of working and produced gas is adjusted in such a way to provide the specified well operation mode.

EFFECT: increase of well operation efficiency, reduction of level and removal of fluid accumulated in bottom-hole zone, provision of well operation stability.

2 cl, 1 dwg

 

The invention relates to oil and gas industry, in particular to gas-lift method, and can be used to control the mode of operation of the gas wells, the operation of which is complicated by the presence of fluid in the stream of gas.

The known method of cyclic pulsed gas-lift production fluid (RF patent No. 2162139, EV 43/00, publ. 2001.01.20), in which a pulse of compressed gas served in the tube space before reaching the annulus pressure is equal to the sum of hydrostatic pressure and the pressure at the bottom of the liquid column in the annulus. The rise of the liquid in the pipe space carried out by decreasing the gas pressure in the well. The next pulse of compressed gas serves at the termination of the removal of fluid from downhole. The frequency of the compressed gas is determined from the condition of full removal them of a liquid accumulated in the bottom hole. This method improves the efficiency of the extraction fluid. The disadvantage of this method is that the frequency of the compressed gas in the tube space is determined experimentally according to research specific conditions of the well.

The closest analogue (prototype) to the proposed method is the method of controlling the operation of gas-lift wells (RF patent No. 2139416, EV 43/00, publ. 199.10.10). According to the invention regulate gas flow rate, measure the change in annulus pressure, optionally measuring the flow rate of gas separation and measurement of the pressure of the working gas in the annulus and the measurement of the flow rate of gas separation by nomograms determine the pressure and velocity of the upward flow of gas and liquid products from Shoe tubing string. The flow rate of the working gas support of the requirements to ensure the speed of the upward flow of the Shoe tubing string within 1.3 to 2.5 m/s, which is experimentally determined based on previously conducted research. This method provides operational control of the stability of gas-lift wells. The disadvantage of this method is the necessity of constructing nomograms after performing measurements and subsequent manual control of the gas flow.

The task to be solved by the invention, is to develop a method of automatically regulating the mode of operation of the gas wells, the operation of which is complicated by the presence of fluid in the stream of gas.

The technical result, which is aimed by the invention, is to increase the efficiency of the well, reducing and removing accumulated in the bottom-hole formation zone of the liquid, ensuring the stability of the well.

DL the achievement of the technical result in the proposed method, including gas-lift well operation by regulating the flow rate and the produced gas, the selection of the produced gas is performed in the Elevator and additional lift columns. The flow and regulate the produced gas by opening and closing controlled shut-off element in accordance with the control signals from the automatic control unit. The control signals form the results of the comparison of measured values with preset values of the parameters commonly used to measure the pressure at the top and the bottom hole are simultaneously measured at the outlet of the tubing string and the output of the additional tubing string, the flow rate of the produced gas and the measured values of the parameters passed to the automatic control unit. The flow rate and the produced gas adjusted so as to provide a given mode of operation of the well. The working gas used or liquefied gas, or gas, or gas from the Assembly point.

During normal operation of the well selection of the produced gas is performed in two columns: the Elevator and additional tubing. When a given mode of operation of the well, which is determined by the given parameter values, provide only by regulating the flow rate of the produced gas. When the accumulation of fluid in the will of wells and therefore, changing the value of the pressure difference between the mouth and the bottom of the borehole carry out the removal of accumulated fluid by changing the speed and direction of the gas streams. Working gas, which is fed to the space between the tubing string and an additional Elevator column, displacing fluid from the annulus enters the additional lifting column, there is mixed with the liquid and form a gas-liquid mixture. The density of the gas mixture has a lower density than the liquid that has accumulated in the well, causing the liquid level in additional tubing string is increased, which provides removal of fluid from the well. The more the working gas is served in the annulus, the less the density of the gas mixture. However, the unregulated flow of the working gas, the following problems occur:

- when a large flow rate of supplied gas increased hydraulic losses in the additional lift column, increasing downhole pressure and decreases the flow of gas from the reservoir;

- at a small flow rate of the supplied gas is not ensured the removal of the required amount of liquid.

Automatic control mode wells on the proposed method allows to eliminate the mentioned disadvantages and to provide optimal R the bots well (which provides a specified flow rate of the produced gas and the conditions for removal of fluid from the well).

The drawing shows a circuit implementing the method.

The proposed method perform gas-lift well operation, harness which consists of a casing 1, a tubing string 2 and additional tubing string 3. The selection of the produced gas is performed in a tubing string 2 and additional lift column 3 open the shutoff elements 4 and 5, for example, the gate valves installed at the outlet of the tubing string and the output of the additional tubing string, respectively, driven by actuators (not shown). With pressure sensors 6 and 7 installed on the wellhead and downhole accordingly, the gain values of the pressure at the wellhead and downhole and transmit the measured values of the parameters in the automatic control unit 8. Simultaneously with flow meters 9 and 10, mounted at the exit of the tubing string and the output of the additional tubing string, respectively, receive the value of the flow rate of the produced gas, which is passed to the automatic control unit 8. In accordance with the control signals, which form by the automatic control unit 8 and transmitted to the actuators that control the shutoff elements 4 and 5 regulate the flow of gas by closing managed shutoff elements 4 and/or 5, supporting the backside of the economic mode of operation of the well. The accumulation of fluid in the wellbore and reach the value of the pressure difference between the mouth and the bottom of a well in which there is provided a given mode of operation of the well, formed by the automatic control unit 8 control signals for closing the shut-off element 4, the compressor 11 and the opening of the shut-off element 12 is controlled by a drive (not shown) and is installed at the entrance to the Elevator column 2, which regulate the flow of working gas into the space between the Elevator column 2 and additional lift column 3. The working gas used or liquefied gas, or gas, or gas from the Assembly point. The flow of the working gas is performed with the aid of the compressor 11. In the gas feed speed of the upward flow of gas-liquid mixture that provides removal of accumulated in the borehole fluid. After removal of the liquid from the bottom and reach the value of the differential pressure at the wellhead and downhole equal to the specified value, in accordance with a control signal generated in the automatic control unit 8, close the shut-off element 12, shut down the compressor 11, open the shut-off element 4 and perform the selection of the extracted gas lift column 2 and additional lift column 3 also serves the military.

If you have a large amount of fluid in the stream of gas carry out the mode of operation of the well with a constant supply of working gas in one of the lift columns and selection of the produced gas from the other columns. The working gas is fed or additional lifting column, or in the space between the Elevator and additional lift column, depending on the control signal fed from the automatic control unit 8. When this gas flow rate is also adjusted automatically.

The proposed method allows to reduce the flow rate of the working gas due to operational flow of the working gas annulus. Thus, implementation of the proposed method enhances the efficiency of the well by reducing the flow rate of the working gas, removing accumulated in the borehole fluid, and ensures the stability of the borehole due to the automatic control mode.

1. A way to automatically control the mode of operation of the gas wells, including gas-lift well operation by regulating the flow rate and the produced gas, characterized in that the selection of the produced gas is performed in the Elevator and additional tubing to the column and the flow and regulate the produced gas by opening and zipper closures protect the controlled shut-off element in accordance with the control signals, coming from the automatic control unit, formed on the comparison of measured values with preset values of the parameters commonly used to measure the pressure at the top and the bottom hole are simultaneously measured at the outlet of the tubing string and the output of the additional tubing string, the flow rate of the produced gas and the measured values of the parameters passed to the automatic control unit, and then regulate the flow rate and the produced gas is thus to provide a given mode of operation of the well.

2. The method according to claim 2, characterized in that the working gas is used or liquefied gas, or gas, or gas from the Assembly point.



 

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18 cl, 2 dwg, 1 ex

FIELD: oil and gas industry.

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2 cl

FIELD: oil and gas industry.

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3 cl, 1 dwg

FIELD: electric engineering.

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EFFECT: improved heat transfer during cooling of submersible electric motors used in pumps, improved coil wires protection from wearing.

11 cl, 3 dwg

FIELD: mining industry.

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EFFECT: optimized well operation.

2 dwg

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