RU2552083C2 - Centrifugal compression of moist gas or expansion with device of protection against liquid piston and/or spray device - Google Patents

Abstract

FIELD: technological processes.

SUBSTANCE: group of inventions relates to a technology used in compression or expansion of multi-phase fluid medium in a system of fluid medium treatment. The device of multi-phase fluid medium compression according to the first version comprises the first pipeline, a device of protection against a piston, connected with the first pipeline, a centrifugal compressor connected with an outlet of the device of protection against a piston, and a distributing pipeline connected with the compressor. The device according to the second version comprises the first pipeline, a spray device connected to the first pipeline, a compressor connected with the outlet of the spray device, and a distributing pipeline connected with the compressor. The device for multi-phase fluid medium expansion according to the first version comprises the first pipeline, a device of protection against a piston, an expander and a pipeline connected with the expander to transport multi-phase fluid medium to the necessary location. The device according to the second version comprises the first pipeline, a spray device, an expander and a distributing pipeline. The method to compress a multi-phase fluid medium includes stages, when they provide devices of protection against a piston or a spray device, send the flow of multi-phase fluid medium into the device of protection against a piston or the spray device, send the flow leaving the device of protection against a piston or the spray device into the receiving part of the centrifugal compressor, and the multi-phase fluid medium is compressed. The method to compress the multi-phase fluid medium comprises components of fluid and gas, at the same time the method includes stages, when they separate liquid from gas in the body, spray the liquid, repeatedly send the sprayed liquid back into the gas flow and compress the produced mix of the sprayed liquid and gas. The method to expand the compressed multi-phase fluid medium according to the first version includes stages, when they provide a device of protection against a piston or a spray device, send the flow of multi-phase fluid medium into the device of protection against a piston or the spray device, send the flow leaving the device of protection against a piston or the spray device into the receiving part of the expander, and the multi-phase fluid medium is expanded. The method to expand the compressed the multi-phase fluid medium according to the second version comprises components of fluid and gas, at the same time it includes stages, when they separate liquid from gas in the chamber, spray the liquid, repeatedly send the sprayed liquid back into the gas flow and expand the produced mix of the sprayed liquid and gas.

EFFECT: increased capacity of treatment of multi-phase fluid media with increased content of liquid by sending the fluid medium via a device of protection against a piston and/or spray device prior to compression or expansion.

30 cl, 5 dwg

Description

Cross reference to related application

This application claims the benefit of provisional application for US patent 61/264414, filed November 25, 2009, entitled "Centrifugal compression of wet gas or expansion with a protection device from the piston and / or spray device, which in its entirety is hereby incorporated by reference .

BACKGROUND OF THE INVENTION

FIELD OF THE INVENTION

The subject matter of this application relates to a technology used in compressing or expanding a multiphase fluid in a fluid processing system.

Description of the prior art

This section is intended to introduce various aspects of the prior art that may be associated with typical embodiments of the present invention. It is intended that this consideration contribute to the creation of basic principles to facilitate a better understanding of the particular aspects of the present invention. Accordingly, it should be understood that this section should be understood in this light and not necessarily as prior art approaches.

It is generally understood that centrifugal compressors or gas expanders do not process liquid pistons, and thus it is accepted that they can only process a fraction of one percent liquid by volume. Thus, in many applications, expensive liquid separators, dehydration methods, and / or scrubber installations are used to test and remove or separate liquids before using centrifugal compressors or expanders. These devices are often designed for special operating conditions and therefore are limited by the interval of the gas volume fraction ((GOF) (GVF)), which can be supplied at a given speed of the process stream. Even with the indicated expensive and complex processing equipment, if there is an unexpectedly high level of liquids, they can quickly saturate, fill and overfill the liquid separators as soon as their liquid capacity is exceeded, which leads to piston movement (plugging) in the compressor or expansion equipment.

Multiphase pumps can usually be used if it is known that the fluid will typically be below 90% GOF. Centrifugal compressors are often limited in applications of GOF 99.7 or higher, and even this can cause problems in the machine with regard to stability and affect the reliability of seals and bearings. Therefore, for processes outside the specified small interval, current practice is to separate fluids before using a centrifugal compressor, even with the developed restriction with the appropriate method and equipment. The same is true for gas expanders, which are a functionally centrifugal compressor, which, on the contrary, releases energy in one form or another when the process pressure in the expander drops. Separators, scrubbers, and dehydration plants are not only expensive and limited in terms of fluid volume and volumetric flow interval, but they also tend to be cumbersome, providing expensive real estate in places such as offshore platforms, underwater processing or offshore equipment. Indicated in conjunction with sophisticated control systems and additional accessories such as pumps, regulators, level controllers, transmitters and filters, increases the complexity and probability of failure of these systems. An example of a method where the pistons (plugs) can cause severe damage is shown in Figure 1, which shows the maintenance of a typical oil or gas well, where a separator 4 is used to separate the liquid from the gas, so that the centrifugal compressor 21 and the pump 12 can then be used to injection of gas and liquid separately. The gas and liquid are then combined again at 14 in order to be piped together to the processing equipment. If one machine can be used to transport the combined stream, this potentially significantly reduces the overall cost and complexity of the entire system.

Some additional issues related to liquids are not only the stability of the machine, but also the erosion of the impellers and nozzles, clogging and the resulting imbalance if the liquids evaporate or evaporate when compressed in a machine. However, it has been shown that erosion can be reduced or prevented by slowing the fluid velocity at the collision points and reducing droplet size. Clogging can also be reduced or even eliminated by increasing liquid levels above the evaporation point in an effective flushing of the inside of the machine.

The above consideration of the need for technology is intended to be representative rather than exhaustive. A technology that will improve the ability of compressors or expanders to process a multiphase fluid stream with a higher liquid content than current technology will be of great importance.

SUMMARY OF THE INVENTION

The problems noted above in the processing of a multiphase fluid stream are addressed using a liquid piston protection device and / or a spray device to improve mixing upstream of the liquid with the gas, thereby enabling a centrifugal compressor or expander to better handle higher liquid levels. The spray device may be any of the known fluid spray devices or a flow mixing device. This can be used in existing designs to help protect the compressor or expander from process failures with an additional volume of liquid, or as an established single design to help exclude parts of the required equipment, such as a separator or liquid pump.

The device for protection against a liquid piston (plug) slows down the liquid piston and mixes the liquid with gas already in the device with a decrease in a sharp change in density. This provides time to slow the compressor motor, as Torque or load increases with increasing fluid volume or lower GOF. In addition, the spray device helps to transform liquid pistons (plugs) into droplets or fog mixed with gas, with the best assistance of the compressor, to cope with a sharp change in density and load while reducing impact, which gives less erosion. Either the product or both can be used sequentially in the use of a compressor or expander, where there is the possibility of failure of some liquids or liquids.

In the context of this discussion, the term "spray device" means any device or mechanism for splitting a liquid into a haze, fog, or spray of liquid. The term "sprayed", as used here, should be understood as meaning small discrete particles of liquid. Also, the term "piston protection device (plug)" means any device that helps to slow down a sharp change in the density of a fluid with a high level of liquid in the gas stream by mixing a predetermined liquid stream with the gas that flows in front, along with or behind the liquid.

The above quite broadly notes the characteristics and technical advantages of the present invention in order to better understand the detailed description of the invention that follows. Next will be described additional characteristics and advantages of the invention, which form the subject of the claims. Those skilled in the art will recognize that the concept and separate embodiment discussed above can easily be used as the basis for modifying or developing other structures to accomplish the same objectives of the present invention. It should also be understood by experts in the field of technology that such equivalent constructions do not depart from the essence and scope of the invention, as presented in the attached claims.

A brief description of several types of drawings

New features that are considered characteristics of the invention, both for its organization and the way it works together with other objects and advantages will be better understood from the following description when considered in conjunction with the accompanying drawings. However, it should be clearly understood that each of the drawings is presented for purposes of illustration and description only and is not intended to define the scope of the present invention.

The figure 1 presents a diagram of a known system for processing a multiphase fluid.

2 is a diagram of one embodiment of a multiphase fluid processing system according to the invention for compressing a multiphase fluid.

3 is a diagram of another embodiment of a multiphase fluid processing system according to the invention for expanding a multiphase fluid.

4 is a diagram of a combined piston protection device and a spray device.

Figure 5 shows a modified version of the multiphase fluid processing system shown in Figure 2.

It should be noted that the drawings are only examples of several variants of the present invention and therefore are not intended to limit the scope of the present invention. In addition, the drawings are usually not made to scale, but are made for convenience and clarity in showing various aspects of the invention.

DETAILED DESCRIPTION OF THE INVENTION

Reference is now made to typical options and the special language used to describe them. However, it is understood that therefore, no limitation on the scope of the invention is implied. Changes to other modifications of the characteristics of the invention described herein, and additional applications of the principles of the invention, as described herein, which will be available to those skilled in the art having this description, should be considered within the scope of the invention. In addition, before considering and describing particular embodiments of the present invention, it should be understood that the present invention is not limited to the particular method and materials discussed herein, since they may vary to some extent. It should also be clear that the terminology used here is used only to describe particular options and is not intended to be limiting, because The scope of the present invention is determined only by the attached claims and their equivalents.

The figure 1 shows a well-known system for processing multiphase fluid in the working conditions of the wellhead. A fluid, which may contain, for example, water, oil and gas, is sent to a cooling device 1 and then to a separation tank 4 through a control valve 2 and a pipe 3. The water is separated and the pump 6 delivers water to a remote location via a pipe 7. Oil and condensate is collected, and pump 12 delivers oil and condensate to line 15 through lines 11 and 13. Gas flows from separator 4 to compressor 21 via line 20, then it passes through check valve 23 and combines with the oil / condensate stream under reference number 14 . A recycling line 30 is provided that includes a valve 31, a cooling device 32, and a check valve 33.

The principles of the invention are shown in one embodiment, as schematically represented in Figure 2. Multiphase fluid, for example fluid from a wellhead, is routed to the device through line 50, control valve 51, and line 52. A mixture of liquid and gas enters the fluid processing device 55 . The fluid processing device may be a piston (plug) protection device or a known spray device, such as one or more spray nozzles or a flow mixer. It may also be a combination of these elements. An example of a combined piston protection device and a spray device is shown in Figure 4. Liquid accumulates in the inner chamber 107 and gas flows into the outer chamber 108. Partitions 104 are provided on the walls of the inner chamber 107 to provide drastic increases in liquid spill in the gas stream and mix with gas . Thus, a sharp increase in fluid flow is slowed by using part of the gas in the piston protection device to reduce the volume of the fluid. Spray nozzles 105 at the lower end of the fluid chamber grind the fluid and spray it into the gas stream downstream of the narrowed portion 109 of the gas flow path. Spray liquid and gas flows continue to flow through piping 106. A typical piston protection device and spray device are available from Framo Engineering AS. The flow mixer may include anti-swirl vanes or swirl chambers with counter-rotation.

Referring again to FIG. 2, the mixture exiting the fluid processing device 55 flows through conduit 56 to compressor 58. Compressed fluid exits compressor 58 through conduit 60 and 61 to control valve 62 and to distribution pipe 63 that supplies compressed fluid Wednesday to the desired location. Under reference numeral 66, a recycling line for the mixture from compressor 58 is provided, which comprises a valve 67 and a control valve 69.

Figure 3 shows the application of the principles of the invention in an expansion system. Multiphase fluid passes through a multiphase flow meter 82, a control valve 84 and a conduit 85 to a fluid processing device 55 from which the mixture flows through a conduit 91, an expander 93, a conduit 94, a control valve 95, and a distribution conduit 96. The expander 93 may be connected to a generator or compressor 92 or any device that requires an energy source. A bypass line 99, 97, together with a valve 98, is provided to bypass the expander 93. A torque converter 90 may be located between the expander 93 and the generator or compressor 90.

The combination of one or both of a piston protection device (plug) and a spray device with torque control or speed reduction with increased load, fluid level or total fluid density will additionally provide a wider operating range for a centrifugal compressor or expander. Compressor speed control, for example, can be achieved by using a variable speed drive, as shown in Figure 2. Variable speed (VSD) drive 57, such as a motor or other mechanical or electric engine, including (but not limited to) a gas motor , a steam or gas turbine, an expander, a hydraulic turbine, is connected to the compressor 58. The drive mechanism that controls the torque or speed between the drive and the compressor can be electronic, hydraulic or mechanical eskim. Suitable variable speed drive controls may include torque, load, fluid density, GFF, or input power sensors.

Adjusting speed or torque helps make compressors and expanders more stable, thereby increasing reliability and lowering costs in refueling conditions when designing a system with better fluid piston and multiphase flow control. This can be applied in all types of centrifugal compressor and expander applications where fluids are present or potentially present in the method, including wellhead servicing, subsea compressors or expanders, LNG (LNG) expansion, wet gas compressors and other methods above and downstream.

A torque control option is to use a torque converter instead of using a USD drive. Then, conventional fixed speed motors, gas turbines, and associated mechanical drives can be used to drive the compressor.

For the expander, flow control may use a two- or three-phase flow meter 82 with the operation of the inlet valve 84 or intake guide vanes in order to reduce the flow when the GOF falls with an increased liquid level, as shown in Figure 3. Other options are to use a torque converter 90 between gas expander 93 and how it is driven or any other method with measuring the density of a fluid, a multiphase mixture of a stream, output power or torque.

As shown in FIG. 5, the variable speed drive 57 of FIG. 2 may be replaced by a fixed speed drive 102. A torque converter 101 may be located between the fixed speed drive and compressor 58 to allow the speed of compressor 58 to vary.

The present invention is further described in the following embodiments:

Option A

A device for compressing a multiphase fluid, comprising:

a first pipeline for transporting multiphase fluid;

a piston protection device connected to the first pipe;

a centrifugal compressor connected to the outlet of the piston protection device; and

a distribution pipe connected to a compressor for transporting the compressed multiphase fluid to a desired location.

Option B

The device of option A, further comprising a spray device located in the first pipe.

Option C

The device of option B, in which the spray device is a flow mixer, which includes at least two anti-swirl vanes or vortex chambers with counter-rotation.

Option D

The device of any of the options AC, in which the engine for the compressor is an electric or gas motor, gas or steam turbine, expander, hydraulic turbine.

Option E

A device of any of the AD alternatives, further comprising a compressor speed control device based on the generated torque, load, fluid density, multiphase flow or output power measurement.

Option F

The device of option B or C, in which the piston protection device and the spray device are combined in a housing having an inlet and outlet, in which the housing comprises:

a first fluid storage chamber;

a second gas storage chamber;

a plurality of partitions between the first and second chambers to enable the accumulated liquid in the first chamber to spill in the second chamber; and

a plurality of spray nozzles located at the end of the first chamber.

Option G

An apparatus according to embodiment F, wherein the housing tapers from inlet to outlet.

Option H

A device according to any one of embodiments A-G, further comprising a recycling conduit connected at one end to a compressor outlet and at its other end to a first conduit.

Option I

A device according to embodiment H, further comprising a recycling valve in the recycling pipeline.

Option J

A device for expanding a multiphase fluid, comprising:

a first pipeline for transporting multiphase fluid;

a piston protection device connected to the first pipe;

an expander connected to the release of the piston protection device; and

a pipe connected to the expander for transporting the multiphase fluid to the desired location.

Option K

A device of embodiment J, further comprising a spray device connected to the first pipe.

Option L

The device of embodiment K, in which the spray device is a flow mixer, which includes at least two anti-swirl blades or swirl chambers with counter-rotation.

Option M

A device of any of the J-L variants, further comprising a generator or compressor connected to the expander power output shaft.

Option N

A device of embodiment K or L, in which the piston protection device and the spray device are combined in a housing having an inlet and outlet, in which the housing comprises:

a first fluid storage chamber;

a second gas storage chamber;

a plurality of partitions between the first and second chambers to enable the accumulated liquid in the first chamber to spill in the second chamber; and

a plurality of spray nozzles located at the end of the first chamber.

Option O

An apparatus according to embodiment N, wherein the housing tapers from inlet to outlet.

Option P

A device according to any one of the J-O variants, further comprising a bypass line connected at one end to the outlet of the expander and at its other end to the first line.

Option Q

An apparatus according to embodiment P, further comprising a bypass valve in the bypass line.

Option R

A device according to any one of J-Q variants, further comprising a speed control device for the expander or drive equipment based on the generated torque, load, fluid density, multiphase flow measurement, or output power.

Option S

A method of compressing a multiphase fluid, comprising the following steps:

providing a protection device against a piston or spray device;

the direction of flow of the multiphase fluid to the piston protection device or spray device;

the direction of the flow exiting the piston protection device or the spray device to the receiving part of the centrifugal compressor; and

multiphase fluid compression.

Option T

A method of compressing a multiphase fluid containing liquid and gas components, which comprises the following steps:

separation of liquid from gas in the housing;

spraying liquid;

re-directing the sprayed liquid back into the gas stream; and

compression of the resulting mixture of atomized liquid and gas.

Option U

A method for expanding a compressed multiphase fluid, comprising the steps of:

providing a protection device against a piston or spray device;

the direction of flow of the multiphase fluid to the piston protection device or spray device;

the direction of the flow exiting from the piston protection device or the spray device to the receiving part of the expander; and

expansion of multiphase fluid.

Option V

A method of expanding a compressed multiphase fluid containing liquid and gas components, which comprises the following steps:

separation of liquid from gas in the chamber;

spraying liquid;

re-directing the sprayed liquid back into the gas stream; and

expanding the resulting mixture of atomized liquid and gas.

Option W

The method of embodiment S, further comprising the step of directing the multiphase fluid through the flow mixer before compressing it.

Option X

The method of embodiment S, wherein the compressor is a centrifugal compressor.

Option Y

The method of embodiment S, further comprising the step of using an electric or gas motor, gas or steam turbine, expander, hydraulic turbine, or other drive device to provide compressor power.

Option Z

Option T device, further comprising a compressor speed control device based on the generated torque, load, fluid density, multiphase flow or output power measurement.

Option AA

A device for compressing a multiphase fluid, comprising:

a first pipeline for transporting multiphase fluid;

a spray device connected to the first pipe;

a compressor connected to the outlet of the spray device; and

a distribution pipe connected to a compressor for transporting the compressed multiphase fluid to a desired location.

Variant BB

The apparatus of embodiment AA, wherein the dispenser comprises one or more spray nozzles or a flow mixer connected to the first conduit.

SS option

An AA or BB variant device, further comprising an electric or gas motor, a gas or steam turbine, an expander, a hydraulic turbine, or other drive device to provide compressor power.

DD Option

A device according to any one of the AA-SS variants, further comprising a compressor speed control device based on torque, load, fluid density, GOR or input power.

Option EE

A device for expanding a multiphase fluid, comprising:

a first pipeline for transporting multiphase fluid;

a spray device connected to the first pipe;

an expander connected to the outlet of the spray device; and

a distribution pipe connected to the expander for transporting the expanded multiphase fluid to a desired location.

Option FF

A device of an option EE, further comprising a piston protection device connected to the first pipe.

GG Option

An EE or FF variant device, further comprising a speed control device for the expander or drive equipment based on the generated torque, load, fluid density, multiphase flow measurement, GOF or power output.

VN option

A device according to any one of the EE-GG variants, further comprising a generator or compressor connected to the expander power output shaft.

Option II

The device of the HH variant, further comprising a bypass pipe connected at one end to the outlet of the expander and at its other end to the first pipe.

JJ Option

Option II device further comprising a bypass valve in the bypass line.

QC option

A device according to any one of the embodiments EE-JJ, wherein the spray device is a flow mixer or one or more spray nozzles.

Option LL

A device according to any one of the options E, R, Y or DD, in which the control or regulation device of the set parameter consists of a torque sensor, a fluid density sensor, a multiphase flow meter, an input power sensor, a torque converter, a computerized control system, an intake or exhaust control valve, recycle valve, variable speed drive, permanent magnet motor or other similar device.

It should be understood that the foregoing is only a detailed description of the individual variants of the present invention, and that numerous changes, modifications and alternatives to the considered variants can be made in accordance with the consideration without departing from the scope of the invention. To a greater extent, the scope of the invention is defined only by the attached claims and their equivalents.

Claims (30)

1. A device for compressing a multiphase fluid containing:
a first pipeline for transporting multiphase fluid;
a piston protection device connected to the first pipe;
a centrifugal compressor connected to the outlet of the piston protection device; and
a distribution pipe connected to a compressor for transporting the compressed multiphase fluid to a desired location. 2. The device according to claim 1, additionally containing a spray device located in the first pipeline. 3. The device according to claim 2, in which the spray device is a flow mixer, which includes at least two anti-spinning blades or swirl chambers with counter-rotation. 4. The device according to claim 1, additionally containing a variable speed drive connected to the compressor input power shaft. 5. The device according to claim 2, in which the piston protection device and the spray device are combined in a housing having an inlet and outlet, the housing comprising:
a first fluid storage chamber;
a second gas storage chamber;
a plurality of partitions between the first and second chambers to enable the accumulated liquid in the first chamber to spill in the second chamber; and
a plurality of spray nozzles located at the end of the first chamber. 6. The device according to claim 5, in which the housing narrows from the inlet to the outlet. 7. The device according to claim 1, additionally containing a recycling pipeline connected at one end to the outlet of the compressor and at its other end to the first pipeline. 8. The device according to claim 7, further comprising a recycling valve in the recycling pipeline. 9. A device for expanding a multiphase fluid, comprising:
a first pipeline for transporting multiphase fluid;
a piston protection device connected to the first pipe;
an expander connected to the release of the piston protection device; and
a pipe connected to the expander for transporting the multiphase fluid to the desired location. 10. The device according to claim 9, further comprising a spray device connected to the first pipe. 11. The device according to claim 10, in which the spray device is a flow mixer, which includes at least two anti-swirl vanes or swirl chambers with counter-rotation. 12. The device according to claim 9, additionally containing a generator or compressor connected to the output shaft of the expander. 13. The device of claim 10, in which the piston protection device and the spray device are combined in a housing having an inlet and outlet, the housing comprising:
a first fluid chamber;
a second gas storage chamber;
a plurality of partitions between the first and second chambers to enable the accumulated liquid in the first chamber to spill in the second chamber; and
a plurality of spray nozzles located at the end of the first chamber. 14. The device according to item 13, in which the housing narrows from the inlet to the outlet. 15. The device according to claim 9, further comprising a bypass conduit connected at one end to the outlet of the expander and at its other end to the first conduit. 16. The device according to clause 15, further comprising a bypass valve in the bypass pipe. 17. The device according to claim 9, additionally containing a device for controlling the speed of the expander or drive equipment based on the generated torque, load, fluid density, measurement of multiphase flow or output power. 18. A method for compressing a multiphase fluid, comprising the steps of:
provide piston protection devices or a spray device;
directing the multiphase fluid flow to a piston protection device or a spray device;
directing the flow exiting the piston protection device or the spray device to the receiving part of the centrifugal compressor; and
compress the multiphase fluid. 19. A method of compressing a multiphase fluid containing liquid and gas components, which comprises the steps of:
separating liquid from gas in the housing;
spray liquid;
re-direct the sprayed liquid back into the gas stream; and
compress the resulting mixture of atomized liquid and gas. 20. A method for expanding a compressed multiphase fluid, comprising the steps of:
provide a piston protection device or a spray device;
directing the multiphase fluid flow to a piston protection device or a spray device;
directing the flow exiting the piston protection device or the spray device to the receiving part of the expander; and
expand multiphase fluid. 21. A method of expanding a compressed multiphase fluid containing liquid and gas components, which comprises the steps of:
separating the liquid from the gas in the chamber;
spray liquid;
re-direct the sprayed liquid back into the gas stream; and
expand the resulting mixture of atomized liquid and gas. 22. The method according to p, optionally containing phase, in which:
direct the multiphase fluid through a flow mixer before compressing it. 23. The method of claim 18, further comprising the step of:
use an electric or gas motor, a gas or steam turbine, an expander, a hydraulic turbine or other drive device to provide power to the compressor. 24. A device for compressing a multiphase fluid containing:
a first pipeline for transporting multiphase fluid;
a spray device connected to the first pipe;
a compressor connected to the outlet of the spray device; and
a distribution pipe connected to a compressor for transporting the compressed multiphase fluid to a desired location. 25. The device according to paragraph 24, in which the spray device contains one or more spray nozzles or a flow mixer connected to the first pipe. 26. The device according to paragraph 24, further comprising a variable speed drive connected to the compressor input power shaft. 27. The device according A.25, optionally containing a device for controlling the speed of the compressor based on torque, load, density of the fluid, GOF or input power. 28. A device for expanding a multiphase fluid, comprising:
a first pipeline for transporting multiphase fluid;
a spray device connected to the first pipe;
an expander connected to the outlet of the spray device; and
a distribution pipe connected to the expander for transporting the expanded multiphase fluid to a desired location. 29. The device according to p. 28, further comprising a piston protection device connected to the first pipeline. 30. The device according to p. 28, additionally containing a device for controlling the speed of the expander or drive equipment based on the generated torque, load, fluid density, measurement of multiphase flow, GOF or power output.

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