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Device for thermal effect on oil beds. RU patent 2247831.

IPC classes for russian patent Device for thermal effect on oil beds. RU patent 2247831. (RU 2247831):

E21B43/24 - using heat, e.g. steam injection (heating, cooling or insulating wells E21B0036000000)

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FIELD: oil industry.

SUBSTANCE: device has compressor machine and serially placed behind it screw pump, connected via pipeline to force well. Product well is connected to separator and collector, which is connected by water feed pipeline to compressor machine and pump. Gas space of separator is connected to input of compressor machine by gas feed pipeline.

EFFECT: higher efficiency.

3 cl, 2 dwg

The invention relates to the oil industry and is aimed at the development of unconventional oil, in particular to the development of bitumen deposits by injecting into the formation of multicomponent medium from the liquid, gas and air.

Known installation for thermal treatment of oil reservoirs (type “OECS”), containing a compressor unit for compressing and feeding the gas into the reservoir, connected to the injection wells pipeline gas supply; a pump unit for pumping water into the reservoir, connected to the injection wells pipeline water supply (see Overview, a series of “Equipment and technology of oil production and development of oil fields”, issue 2, M, 1988, p.26, Fig.10).

A disadvantage of the known installation is low efficiency due to the high metal consumption, complexity and bulkiness of the design, as well as heat loss of the compressed gas.

These drawbacks are eliminated in the other, is known from the patent of the Russian Federation No. 1662156, E 21 In 43/24, priority 11.08.88,, installation for thermal treatment of oil reservoirs containing a compressor unit connected to the injection wells, and communicated between a separator and sump water reservoir connected to the p well. Suction line of the compressor unit with pipeline gas supply is connected to the separator, and the cavity of the compression piped water supply was installed on the pump connected to the sump reservoir water.

In the compressor receives air from the atmosphere and produced water and gas from the sump and separator. Formed vodorazdelnaya mixture is compressed and heated by the heat of compression is supplied to the injection well.

A simpler design setting allows the maximum use of the heat capacity of the compressor, which increases the efficiency of its operation, and disposal of produced water protects the environment from petroleum products production.

This solution is the closest to the proposed set of features and made for the prototype.

Known installation is not effective enough, because the amount of liquid that can be submitted to the compressor during the compression process, is limited and not enough for intensification of oil recovery. The maximum amount that can pass, for example, the most reliable in this respect, the screw compressor is not more than 5% of the liquid volume of compressible air-gas environment. Exceeding this limit leads to a surge and the destruction of the compressor unit.

Thus, limiting the volume ratio of gas and liquid reduces technological capabilities impact on the reservoir, does not allow the maximum use of the capacity of the plant, it is not possible to dispose of produced water in full and to protect the environment from pollution.

The task of the invention is to increase efficiency by expanding the technological capabilities impact on the reservoir due to the expansion of the range of ratios of volumes of liquid and gas. Multiply fed into the reservoir fluid makes it possible to dispose the maximum amount of produced water, using it for the preparation of multicomponent environment and pumping it all into injection wells.

The problem is solved in that in the known installation for thermal treatment of oil reservoirs containing coupled with injection wells compressor unit that connects the feeder pipelines gas and liquid from the separator and sump connected with the mining well, according to the invention on the piping connecting the compressor unit and the injection well, installed a multiphase screw pump, connects the supply line of the liquid from the sump.

It is advisable to multiphase screw pump was performed in a two-line, and each coil side of the pump connected to the sump through a separate supply line fluid.

It is also advisable that the compressor was performed two-stage screw and the pipe feeding the liquid from the settling tank is fed to a first stage compressor.

Thanks to the inclusion in the discharge line of the multiphase booster screw pump capable of pumping environment with any ratio of liquid and gas, allows complete utilization of the produced water and protect the environment from pollution by-products of oil extraction.

A two-line running of the pump, i.e. with two pairs of screws with opposite screw threaded, provides unloading of the rotor from the axial forces, which increases the reliability of the installation. The input fluid directly into the working area of the screws contributes to the increase of the pressure in the cavity and thereby provides the most economical process of compressing the gas-liquid mixture.

Using speed screw compressor allows you to inject fluid into the working cavity, which improves the workflow of the compressor due to the proximity of the compression process to isothermal and makes it possible to dispose the heat of compression and to increase the efficiency of the installation.

Figure 1 presents the scheme of pump-compressor unit.

Figure 2 - block unit compressor and pump.

The system includes a compressor unit 1 and sequentially located behind it multiphase screw pump 2 mounted on the pipe 3 connecting it to the discharge hole 4. Production well 5 is in communication with the separator 6 and the sump 7. The gas space of the separator is connected by a pipe 8 gas supply to the input of the compressor unit. The tank 7 in the bottom part connected by a pipe 9 feed water through the feed pump 10 to the compressor unit 1 and through the additional pipe 11 to the pump 2.

Compressor unit 1 (figure 2) performed two-stage and consists of a series set screw compressors 12, 13 - 1-St and 2-nd stages. Each stage is equipped with nozzles 14, 16 of the inlet and the nozzles 15, 17 exit.

The output of compressor 12 is connected by a pipe 18 with the inlet of the compressor 13. On the screw part of the compressor housing 12 made additional pipe 19 for supplying water.

Multiphase screw pump 2 has a two-line and contains two pairs of screws 20, 21 with the opposite cutting.

The entrance to the pump through pipe 22 made on the side of the screws, and the output is in the Central part through pipe 23. In addition, each of the helical part of the body is placed nozzles 24, 25 inlet fluid.

Pipeline 3 the pump inlet 2 communicates with the outlet of the compressor 13.

The device operates as follows.

In the compressor unit 1 receives air from the atmosphere and the gas through the pipeline 8, separated in the separator 6 of the products of the production well 5. At the same time the pipe 9 through the feed pump 10 from the tank 7 into the pump 2 and the compressor is injected produced water. As a result, the output of the pump 2 is formed is heated by the heat of compression of the gas mixture, which is supplied under pressure to the injection well 4.

Pre-compression gas-air mixture is carried out in two stages screw compressors 12 and 13. Part of the produced water enters directly into the screw compressor 12 through the pipe 19. The remaining amount of liquid enters the screws 20, 21 of the pump 2 through the nozzles 24 and 25. Pump 2 digimet vodorazdelny mixture flowing through a pipeline 3 from the compressor unit to the input of the pump through the pipe 22, and pump through the outlet nozzle 23 to the injection well.

Thus, the proposed solution allows to increase the reliability and efficiency of operation, to expand its technological capabilities.

In addition, the combination of a series set screw compressors and screw booster pump provides maximum pressure of the injected medium in a more simple and reliable installation in comparison with the known technical solutions, which are used, for example, multi-stage centrifugal compressors and booster piston. If you pre-compression screw compressors are the most preferable in the pressure range of 15-20 ATM, then expanded in screw pumps can provide the working medium pressure up to 100-150 ATM that meets the requirements for injection into the reservoir.

1. Installation for thermal treatment of oil reservoirs containing coupled with injection wells compressor unit that connects the feeder pipelines gas and liquid from the separator and sump connected with mining borehole, characterized in that the pipe connecting the compressor unit and the injection well, installed a multiphase screw pump, connects the supply line of the liquid from the sump.

2. Installation for thermal treatment of oil reservoirs according to claim 1, characterized in that the multiphase screw pump has a two-line, with each coil side of the pump connected to the sump through a separate supply line fluid.

3. Installation for thermal treatment of oil reservoirs according to claim 1, characterized in that the compressor unit is screw two-stage, and the pipe feeding the liquid from the settling tank is fed to a first stage compressor.