RU2276253C1 - Method for gas-and-liquid mixture lifting from well - Google Patents

Abstract

FIELD: oil production industry, particularly to produce light oil.

SUBSTANCE: method for creating continuous gas-liquid flow, depressing thereof and delivering the flow to ground surface involves passing gas-liquid flow through well filter; directing the flow to turbine installed at lower end of production string and rotating the turbine due to gas-liquid mixture inflow, which provides oil reservoir energy; forming rotational moment in drive of separator, where gas-liquid mixture is separated into gas and liquid and directed along gas ascending line defined by channel connecting casing pipe and flow string; passing liquid via channel defined by flow string interior; separating gas and liquid ascending lines with packer; creating pressure at well head, which depressed liquid flow by means of ejector connected to liquid ascending line and supplied from gas ascending line to provide additional gas emission from ascending liquid flow; regulating gas pressure with bypass line and valves.

EFFECT: provision of continuous gas-liquid flow and depression thereof along with gas-liquid flow delivery to ground surface.

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Description

The invention relates to the oil industry and can be used in the extraction of light oils.

A known method of oil production and a device for its implementation (RF patent 2093243, E 21 In 43/00, 2002.07.10). The inventive drill a well. Equip it with casing and pump pipes with wellhead fittings and a plunger deep pump, with a drive made in the form of a hydraulic cylinder. The inlet nozzles of the hydraulic cylinder are connected by valves with the internal volume of the pump pipe, and the outlet ones are connected with the annulus. The housing of the hydraulic cylinder has the ability to rotate around the axis and is connected to the valve of the upper partition of the lock chamber. The hydraulic cylinder is supplied with a command device. They create an environment inside the pipes that ensures the rise of oil. The creation of the environment is carried out by the formation of two partitions with valves of the lock chamber. Valves control the control unit. A lock chamber is formed at the bottom of the pump pipe. A perforated partition with a valve between the pump and the pump pipe is the upper partition of the lock chamber. The pump pipe above the upper partition is filled with water to the level of the flow pipe of the wellhead fittings. In this case, the pump plunger ensures the replacement of water with oil in the lock chamber due to the pressure difference in the pump pipe in the annulus. The rise of oil from the upper partition is provided by the difference in the densities of water and oil. The disadvantage of this method is the impossibility of its use for lifting light oils from great depths.

A known method of lifting a gas-liquid mixture of wells and a pumping unit for its implementation, adopted as a prototype (RF patent No. 2099508, E 21 B 43/00, 1997.12.20). A method of raising a gas-liquid mixture is to create a continuous flow of well products through a downhole pumping device both during the upward and downward plunger strokes, according to the invention, a two-chamber deep-well pumping device with two plungers is installed in a lifting column of tubing in accordance with the invention, separated from each other by a dividing wall, with the help of which, with their reciprocating movement, rarefied spaces are created in the chambers, contributing to the additional gas from the incoming borehole production, during upward movement, forming a rarefied space under the upper plunger, and in the hollow rod connecting the upper chamber and the lower subplunger space, and the gas-liquid mixture is squeezed from the lower chamber through the nozzle of the ejector device located in the lower hollow rod , at a given speed, forming a rarefied space in the hollow stem, which is enhanced by the suction effect of the upper plunger, which is accompanied by the opening of the lower discharge valve, are additional m by degassing the liquid in the sub-plunger space of the lower plunger and increasing the flow of the gas-liquid mixture through the hollow stem, a sharp increase in its volume, accompanied by an increase in pressure and opening of the discharge valve on the upper stem and the creation of a gas-lift effect, which is amplified during the plungers as a result of the passage of gas-liquid through the hollow stem the mixture located in the subplunger space of the lower plunger, and additional gas evolution from the liquid entering the lower chamber formed above with a plunger, which, with a sufficient gas content of the liquid, forms a continuous flow through the deep-pumping device, dramatically increasing its productivity. The method is also characterized by the fact that an evaporator-ejector controller is installed at specified depths in the liner, by which a sharp expansion of its cross section and turbulization of the liquid stream intensify the gas evolution at the entrance to the ejector, and then divide it into two gas-liquid flows with a larger and lower gas content, a stream of liquid with high gas content is passed through the central nozzle of the ejector into the evaporation chamber, in which additional degassing is carried out, from where the lighter components through the upper part of the separation chamber they are sent to the suction chamber, which are then sucked into the injection pipe, in which a vacuum is created by a second fluid stream, where the heavier components of the degassed liquid from the separation chamber also enter through its lower openings, where they are mixed with new portions in the receiving chamber of the ejector the fluid coming from the liner, turbulizing it, contributes to the additional gas evolution, which, passing through the ejector nozzle, picks up the gas-liquid mixture, flowing from the separation chamber to the suction chamber. The installation for lifting a gas-liquid mixture consists of a downhole pump device and an evaporative ejector controller, according to the invention, a downhole pump device is installed at predetermined depths in the pipe lifting string, which includes two chambers formed between two plungers by separating their travel interval from each other by a partition communicating between themselves and lifting columns located above and below the device, hollow rods with holes with check valves connected to each other by a thrust coupling, Amkova device with a rod seal, and the lower part of the lower rod performs the role of the ejector body, inside which is placed its guide nozzle, and the evaporation-ejector controller, including the body, a central pipe with side tubular windows, an evaporation chamber with upper and lower holes, a separation chamber , a suction chamber with holes, a receiving chamber, nozzles and an injection tube. The disadvantage of this method is the impossibility of its use for lifting light oils from great depths.

The technical result of the method is the ability to produce light oils from great depths.

The technical result is achieved by the fact that in the method of raising a gas-liquid mixture of wells, which consists in creating a continuous flow of a gas-liquid mixture and diluting it with the delivery of a gas-liquid mixture to the surface, according to the invention, the flow of the gas-liquid mixture after passing through the well filter is directed to a pump-compressor installed at the lower end pipe the turbine and create the possibility of its rotation due to the influx of gas-liquid mixture - reservoir energy of the oil reservoir, form a torque through one on the separator, where the gas-liquid mixture is separated into gas and liquid and directed along the gas lift line formed by the channel between the casing and the tubing, and the liquid is directed through the channel formed by the interior of the tubing, the gas and liquid lift lines separated from each other by a packer, and at the wellhead create such a rarefaction of the fluid flow included in the fluid lift line and fed by an ejector from the gas lift line, which causes additional gas evolution of the rising liquid, the gas pressure is controlled with a bypass line and valves.

The application of the proposed method in comparison with the prototype allows for the production of light oils from great depths.

When producing light oils, one of the main problems is the difficulty of raising a gas-liquid mixture from depth due to gas evolution directly during the lifting of a gas-liquid mixture, which significantly reduces the productivity of oil production wells and makes it impossible to use mechanized methods of oil production. Due to the separation of gas and oil directly at the bottom and installation of an ejector at the wellhead fed from the gas lift line and creating a vacuum, it becomes possible to lift light oil from great depths.

The method of lifting gas-liquid wells is illustrated in the drawing, where

1 - ejector included in the line of fluid production;

2 - bypass line;

3 - tubing;

4 - casing;

5 - separator;

6 - drive;

7 - turbine;

8 - oil reservoir;

9 - gas lift line;

10 - line lifting fluid;

11 - packer;

12 - downhole filter;

13 - tank;

14 - valve line gas lift;

15 - tank valve.

The method of lifting a gas-liquid mixture of wells is carried out in the following way. A continuous stream of gas-liquid mixture is created from the oil manifold 8. The gas-liquid mixture coming from the oil manifold 8 through the well filter 12 enters a turbine 7 mounted on a tubing 3 connected through a drive 6 to a separator 5. The turbine 7 rotates due to the inflow gas-liquid mixture, that is, due to the reservoir energy of the oil reservoir 8 and is designed to create torque on the separator 5. Next, the gas-liquid mixture is separated by the separator 5 directly in the well into gas and liquid depth at the depth of the oil reservoir 8. Gas is routed along the gas lift line 9 formed by the channel between the casing 4 and the tubing 3. The oil is routed along the fluid elevation line 10 formed by the interior of the tubing 3. At the wellhead an ejector 1 included in the liquid lifting line 10, fed from the gas lifting line 9. The gas flow from the gas lift line 9, passing through the nozzle of the ejector 5, forms a rarefied space at the wellhead. Thus, due to the creation of rarefaction at the wellhead, an intensive flow of fluid from the fluid rise line 10 to the reservoir 13 is caused. In addition, the rise of fluid due to the rarefaction causes additional gas evolution from the fluid to be lifted, which causes a more intense rise of oil from great depths. To control the process of gas supply and liquid lifting, valves 14 are installed on the gas lifting line 9 for adjusting the pressure in the bypass line 2. A valve 15 is installed on the tank 13 for oil drainage.

The application of the proposed method of lifting a gas-liquid mixture of wells provides the following advantages:

- the possibility of producing light oils from great depths;

- increased productivity for lifting light oil;

- reduction of energy costs for the extraction of light oils.

Claims (1)

A method of raising a gas-liquid mixture of wells, which consists in creating a continuous flow of a gas-liquid mixture and diluting it with the delivery of a gas-liquid mixture to the surface, characterized in that the gas-liquid mixture flow after passing through the well filter is directed to a turbine installed on the lower end of the tubing and makes it possible rotation due to the influx of gas-liquid mixture - reservoir energy of the oil reservoir, form a torque through the drive on the separator, where the gas-liquid mixture is once pour on gas and liquid and sent along the gas line formed by the channel between the casing and the tubing, and the liquid is directed through the channel formed by the interior of the tubing, and the gas and liquid lines are separated by a packer, and at the wellhead create such a rarefaction of the fluid flow included in the liquid lift line and fed by an ejector from the gas lift line, which causes additional gas evolution from the rising liquid, and the gas pressure controlled bypass line and valves.