Key information

Title
System and method for compression of gas
Application number
20181475
Case type
National
Status
16.05.2022 Patent meddelt (B1)
Filed
19.11.2018
Effective date
19.11.2018
Publicly available
20.05.2020
Next annual fee due
30.11.2026
Applicant
STRAEN ENERGY AS (NO)
Owner
STRAEN ENERGY AS (NO)
Inventor
Arild Aarskog (NO)
Agent
HÅMSØ PATENTBYRÅ AS (NO)
Granted
16.05.2022
Patent number
346262
Expiry date
19.11.2038

Abstract and drawing

Disclaimer: This text has been machine-scanned and may contain errors – please refer to "Publications" for legally binding content.
It is described a system (1) for compression of a gas separated from a multiphase fluid in a well stream (8), the multiphase fluid comprising at least liquid and gas, wherein the system (1) comprises: - a first module (2) comprising at least one first separator (10), the first module (2) being configured to receive the multiphase fluid and separate it into a first gas fraction and a fluid fraction comprising liquid and residual gas; - an ejector (62) having a first inlet (620), a second inlet (621) and an outlet (622), wherein the outlet (622) is coupled to the at least one first separator (10); - a second separator (50) coupled to the first module (2) for receiving said fluid fraction and separate it into a liquid fraction and a second gas fraction, the second separator (50) being coupled to the first inlet (621) of the ejector (62) for supplying the second gas fraction to the ejector (62); - a pump (56) having an inlet (560) and an outlet (561), the inlet (560) being coupled to a liquid reservoir (23) and the second separator (50) for supplying liquid to the pump (56), the outlet (561) being coupled to the second inlet (621) of the ejector (62) for supplying a pressurized liquid to the ejector (62), wherein the second gas fraction is entrained with the pressurized liquid in the ejector (62) and supplied to the at least one first separator (10) via the outlet (622) of the ejector; - a compressed gas line (15) coupled to the at least one first separator (10) for extracting compressed gas, wherein the gas in the at least on first separator (10) is compressed by the pressurized liquid.

Publications

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 Date Doc. No. Process Case number In/Out Journal description To/from
 20.05.2022 18-01 Saksbehandling 20181475(346262) UT PT Registreringsbrev Nasjonal Patent (15) (PT20181475)
14.02.2022 17-01 Saksbehandling 20181475 UT PT Meddelelse om patent HÅMSØ PATENTBYRÅ AS
 07.02.2022 16-05 Saksbehandling 20181475 INN P28738NO00_Svar_Patentstyrets_uttalelse HÅMSØ PATENTBYRÅ AS
 07.02.2022 16-04 Saksbehandling 20181475 INN P28738NO00_Norske_krav HÅMSØ PATENTBYRÅ AS
 07.02.2022 16-03 Saksbehandling 20181475 INN P28738NO00_Description_and_claims_Mark-up_copy HÅMSØ PATENTBYRÅ AS
 07.02.2022 16-02 Saksbehandling 20181475 INN P28738NO00_Description_and_claims_Clean HÅMSØ PATENTBYRÅ AS
 07.02.2022 16-01 Saksbehandling 20181475 INN Korrespondanse (Hovedbrev inn) HÅMSØ PATENTBYRÅ AS
 04.02.2022 15-01 Saksbehandling 20181475 UT Realitet patent HÅMSØ PATENTBYRÅ AS
 02.02.2022 14-05 Saksbehandling 20181475 INN P28738NO00_Svar_Patentstyrets_uttalelse HÅMSØ PATENTBYRÅ AS
 02.02.2022 14-04 Saksbehandling 20181475 INN P28738NO00_Description_and_claims_Mark-up_copy HÅMSØ PATENTBYRÅ AS
 02.02.2022 14-03 Saksbehandling 20181475 INN P28738NO00_Description_and_claims_Clean HÅMSØ PATENTBYRÅ AS
 02.02.2022 14-02 Saksbehandling 20181475 INN P28738NO00 Norske krav HÅMSØ PATENTBYRÅ AS
 02.02.2022 14-01 Saksbehandling 20181475 INN Korrespondanse (Hovedbrev inn) HÅMSØ PATENTBYRÅ AS
 17.12.2021 13-04 Saksbehandling 20181475 INN Project Formation Fluid Boostering - Saudi Aramco HÅMSØ PATENTBYRÅ AS
 17.12.2021 13-03 Saksbehandling 20181475 INN Patentstyret (4) (2) HÅMSØ PATENTBYRÅ AS
 17.12.2021 13-02 Saksbehandling 20181475 INN Kopi av CCV dimensjonering saudi-Ongoing rev02 (2) HÅMSØ PATENTBYRÅ AS
 17.12.2021 13-01 Saksbehandling 20181475 INN Korrespondanse (Hovedbrev inn) HÅMSØ PATENTBYRÅ AS
 17.12.2021 12-01 Saksbehandling 20181475 UT Realitet patent HÅMSØ PATENTBYRÅ AS
 25.08.2021 11-04 Saksbehandling 20181475 INN P28738NO00_Svar_Patentstyrets_uttalelse HÅMSØ PATENTBYRÅ AS
 25.08.2021 11-03 Saksbehandling 20181475 INN P28738NO00_Amended_claims_Mark-up_copy HÅMSØ PATENTBYRÅ AS
 25.08.2021 11-02 Saksbehandling 20181475 INN P28738NO00_Amended_claims_Clean HÅMSØ PATENTBYRÅ AS
 25.08.2021 11-01 Saksbehandling 20181475 INN Korrespondanse (Hovedbrev inn) HÅMSØ PATENTBYRÅ AS
 25.05.2021 10-01 Saksbehandling 20181475 UT Realitet patent HÅMSØ PATENTBYRÅ AS
 18.01.2021 09-02 Saksbehandling 20181475 INN P28738NO00_Svar_Patentstyrets_uttalelse_Jan_18_2021 HÅMSØ PATENTBYRÅ AS
 18.01.2021 09-01 Saksbehandling 20181475 INN Korrespondanse (Hovedbrev inn) HÅMSØ PATENTBYRÅ AS
 17.10.2020 08-01 Saksbehandling 20181475 UT Realitet patent HÅMSØ PATENTBYRÅ AS
 06.10.2020 07-01 Saksbehandling 20181475 UT PT Varsel om betaling av første årsavgift (3317) (PT20181475)
14.09.2020 02-01 Endring av søker/innehaver 2020/10803 UT GH Forespørsel HÅMSØ PATENTBYRÅ AS
 31.08.2020 01-01 Endring av søker/innehaver 2020/10803 INN Generell henvendelse HÅMSØ PATENTBYRÅ AS
 24.06.2020 06-04 Saksbehandling 20181475 INN Krav ren HÅMSØ PATENTBYRÅ AS
 24.06.2020 06-03 Saksbehandling 20181475 INN Krav merket HÅMSØ PATENTBYRÅ AS
 24.06.2020 06-02 Saksbehandling 20181475 INN Hovedbrev HÅMSØ PATENTBYRÅ AS
 24.06.2020 06-01 Saksbehandling 20181475 INN Korrespondanse (Hovedbrev inn) HÅMSØ PATENTBYRÅ AS
 26.03.2020 05-01 Saksbehandling 20181475 UT Realitet patent HÅMSØ PATENTBYRÅ AS
 26.11.2019 04-04 Saksbehandling 20181475 INN Krav ren HÅMSØ PATENTBYRÅ AS
 26.11.2019 04-03 Saksbehandling 20181475 INN Hovedbrev HÅMSØ PATENTBYRÅ AS
 26.11.2019 04-02 Saksbehandling 20181475 INN Krav merket HÅMSØ PATENTBYRÅ AS
 26.11.2019 04-01 Saksbehandling 20181475 INN Korrespondanse (Hovedbrev inn) HÅMSØ PATENTBYRÅ AS
 03.06.2019 03-02 Saksbehandling 20181475 UT PT_report 11:15:37
03.06.2019 03-01 Saksbehandling 20181475 UT Realitet patent HÅMSØ PATENTBYRÅ AS
 20.11.2018 02-01 Saksbehandling 20181475 UT Infobrev til oppfinner HÅMSØ PATENTBYRÅ AS
 19.11.2018 01-05 Saksbehandling 20181475 INN Beskrivelse HÅMSØ PATENTBYRÅ AS
 19.11.2018 01-04 Saksbehandling 20181475 INN Patenttegninger HÅMSØ PATENTBYRÅ AS
 19.11.2018 01-03 Saksbehandling 20181475 INN Erklæring Søkers rett til oppfinnelse HÅMSØ PATENTBYRÅ AS
 19.11.2018 01-02 Saksbehandling 20181475 INN Fullmakt HÅMSØ PATENTBYRÅ AS
 19.11.2018 01-01 Saksbehandling 20181475 INN Søknadsskjema Patent HÅMSØ PATENTBYRÅ AS

Description, claims and drawings

Disclaimer: This text has been machine-scanned and may contain errors – please refer to "Publications" for legally binding content. Description
SYSTEM AND METHOD FOR COMPRESSION OF GASThis invention relates to a system for compression of gas separated from a multiphase fluid from a well stream. More particularly, the invention relates to a system wherein a liquid is used as a motive liquid to compress a gas separated from the multiphase fluid. The invention also relates to a method for compression of gas separated from a multiphase fluid from a well stream.Over time, the oil and gas industry has developed, and improved processes related to separation of hydrocarbons. However, compression and treatment of separated gas still has a great potential with regards to reducing complexity, sizes, weights and energy consumption of the separation systems.Patent document GB 2436580 discloses a method and a device for artificially compressing fluids in a hydrocarbon reservoir to make them rise to the surface and to operate at a prerequisite pressure. The object is achieved by using separation and compression units, for example dummy wells. The method further describes that a mixture of liquid and gas are pressurized by means of an ejector, without any further means for pressurizing the separated gas prior to extraction from the system.SU 1611369 A discloses a system including several oil and gas separators, an oil circulation pipe, an ejector, and a pump. The pump is used to re-circulate oil from one of the separators, and the re-circulated oil is used as motive fluid in the ejector to entrain a gas fraction from another one of the separators.NO 340513 B1 discloses a method for increasing the pressure in a fluid/gas multiphase fluid from a well by using a pressurized liquid as motive fluid for entraining gas in an ejector.The invention has for its objective to remedy or to reduce at least one of the drawbacks of the prior art, or at least provide a useful alternative to prior art. It is also an objective of the invention to provide a simplified system for pressure support of a compressed separated gas. It is a further objective of the invention to increase the overall safety related to processing of hydrocarbons. The objectives are achieved through features, which are specified in the description below and in the claims that follow.The invention is defined by the independent patent claims. The dependent claims define advantageous embodiments of the invention.The objectives are obtained by means of a system for compression of a gas separated from a multiphase fluid in a well stream, the multiphase fluid comprising at least liquid and gas, wherein the system comprises:- a first module comprising at least one first separator, the first module being configured to receive the multiphase fluid and separate it into a first gas fraction and a fluid fraction comprising liquid and residual gas;- an ejector having a first inlet, a second inlet and an outlet, wherein the outlet is coupled to the at least one first separator;- a second separator coupled to the first module for receiving said fluid fraction and separate it into a liquid fraction and a second gas fraction, the second separator being coupled to the first inlet of the ejector for supplying the second gas fraction to the ejector;- a pump having an inlet and an outlet, the inlet being coupled to a liquid reservoir for supplying liquid to the pump, the outlet being coupled to the second inlet of the ejector for supplying a pressurized liquid to the ejector, wherein the second gas fraction is entrained with the pressurized liquid in the ejector and supplied to the at least one first separator via the outlet of the ejector, wherein a compressed gas line is coupled to the at least one first separator for directly extracting compressed gas from the system, wherein the gas in the at least on first separator is compressed and pressurized by the pressurized liquid from the pump.The invention solves the abovementioned drawbacks related to the prior art by providing a compact system for separation of a multiphase fluid from a well stream, wherein the separated gas is pressurized by means of pumping a liquid rather than using compressors. The system has the effect that a size and complexity of the separation system may be significantly reduced, as compared to the prior art. This is essential for reducing the weight, footprint and the cost of the system if it is to be installed subsea, on a platform or on a floating vessel. In an embodiment, the pressurized liquid is water. In an embodiment, the multiphase fluid contains at least gas, water and oil. The multiphase fluid may also comprise slugs of either gas or liquid, a slug being an accumulation or large quantity of either gas or liquid in the fluid flow.By means of coupling the pump to the second separator, the liquid fraction can be reused to pressurize the gas. Excess liquid may be diverted to the liquid reservoir. Shortage of liquid from the second separator to the pump may be compensated for by supplying the pump with liquid from the liquid reservoir.In an embodiment of the invention, the system further comprises a third separator arranged in the first module, wherein the separation of the multiphase fluid is carried out in the third separator, the third separator being coupled to the at least one first separator and the second separator, wherein the first gas fraction is supplied to the at least one first separator and the fluid fraction comprising liquid and residual gas is supplied to the second separator.By means of the third separator, the multiphase fluid undergoes a first separation prior to supplying the gas fraction to the at least one first separator. Thus, the at least one first separator can hold more gas as a bulk of the multiphase fluid is separated out beforehand.In an embodiment of the invention, the inlet of the pump is coupled to the at least one first separator for supplying liquid from the at least one first separator to the pump. As the at least one first separator is supplied with a pressurized liquid from the ejector, it will comprise liquid. This liquid is separated from the gas in the at least one first separator. By coupling the at least one first separator to the inlet of the pump, this liquid may be supplied to the pump to be reused. In an embodiment, the inlet of the pump is coupled to an external liquid reservoir in addition to the at least one first separator to supplement the liquid supply to the pump should the liquid from the at least one first separator not be sufficient to operate the pump efficiently.In an embodiment of the invention, the outlet of the pump is coupled to the at least one first separator for selectively supplying the at least one first separator with pressurized liquid either directly or via the ejector. By means of coupling the pump directly to the at least one first separator, the pump may be used to solely pressurise the gas already in the at least one first separator, and not via the ejector. This may for example be preferable if the desired pressure in the at least one first separator is higher than what the ejector can provide.In an embodiment of the invention, the system further comprises a scrubber coupled to the compressed gas line. By means of the scrubber the compressed gas extracted from the first separator may be cleaned for unwanted particles or pollutants before being sent for further use. Cleaning may also be defined as removal or washing. The scrubber may be an absorber, a dry scrubber or a wet scrubber. Functionality of the scrubber is not described in detail as it is considered well known to a person skilled in the art.In an embodiment of the invention, the system further comprises a cooler for cooling a fluid in the system. The system may comprise one or more coolers. The cooler is configured to lower the temperature of a liquid and/or a gas in the system. In one embodiment, the cooler cools the liquid supplied to the pump, thus the effect of direct cooling of the gas from the liquid during compression of the gas is enhanced. The cooler may eliminate the need for a gas cooling system. In one embodiment, the cooler cools the gas supplied to the at least one first separator.In an embodiment of the invention, the first module comprises four first separators. By means of the four first separators the system may alternate between which separators that are receiving fluid, undergoing pressurization of the gas and being drained for liquid, and thus enabling the system to operate continuously, i.e. deliver a substantially constant gas pressure.The objects of the invention is further obtained by means of a method for compression of gas separated from a multiphase fluid from a well stream, the method comprising the steps off:- separation of the multiphase fluid in a first module to obtain a first gas fraction and a liquid fraction containing gas;- separation of the liquid fraction containing gas to obtain a second gas fraction and a liquid fraction;- pumping a liquid to obtain a pressurized liquid;- entraining the second gas fraction with the pressurized liquid by means of an ejector to obtain a mixture of liquid and gas;- supplying said mixture to the first module to compress and pressurize the first gas fraction, and - directly extracting the compressed and pressurized gas from the system in the first separator.In the following is described examples of preferred embodiments illustrated in the accompanying drawings, wherein:Fig. 1 shows schematically a system according to the invention;Fig. 2 shows schematically the system according to a second embodiment of the invention;Fig. 3 shows schematically the system according to a third embodiment of the invention;Fig. 4 shows schematically the system according to a fourth embodiment of the inventionThe figures are depicted in a simplified manner, and details that are not relevant to illustrate what is new with the invention may have been excluded from the figures. The different elements in the figures may necessarily not be shown in the correct scale in relation to each other. Equal reference numbers refer to equal or similar elements. In what follows, the reference numeral 1 indicates a system according to the invention.Figure 1 shows the system 1 comprising a first module 2 provided with a first separator 10. The first separator 10 may be of a conventional type utilizing gravity to separate the fluids. In one embodiment, the first separator 10 may be a vertical cylindrical separator, wherein a diameter of the cylinder is smaller than a height, for example 1 meter in diameter and 5 meter high. In another embodiment, the first separator 10 may be a pipe or a tube.The first module 2 is coupled to the well stream 8 for receiving a multiphase fluid. The multiphase fluid is further supplied to the first separator 10. In another embodiment, as will be described below, the multiphase fluid is first supplied to another separator not shown in figure 1. The multiphase fluid is separated in a first gas fraction and a fluid fraction comprising liquid and residual gas. A fluid extraction line 13 is coupled to a lower portion of the first separator 10 for extraction of the fluid fraction. A compressed gas line 15 is coupled to an upper portion of the first separator 10 for extraction of compressed gas. The fluid extraction line 13 connects the first separator 10 to a second separator 50. In the second separator 50 the fluid fraction is separated in a gas fraction and a liquid fraction. The second separator 50 may be any type of conventional separator, such as a dynamic separator or a static separator. A dynamic separator is a preferred embodiment for separating a fluid fraction comprising considerably larger liquid fraction than gas fraction. The dynamic separator may be of a turbo type or cyclone type, or other known types. A static separator has a less complex design than a dynamic separator and utilizes gravity for separation of the different fluids. For example, a static separator may be a tank wherein the fluids are stored, and thus separated by virtue of the density of each fluid. In one embodiment, the second separator 50 may be a combination of a dynamic and a static separator.Figure 1 further shows the second separator 50 being coupled to a first inlet 620 of an ejector 62 via a gas extraction line 51. A liquid extraction line 52 is coupled to a lower portion of the second separator 50 for extraction of the liquid fraction, for example oil. An outlet 561 of a pump 56 is coupled to a second inlet 621 of the ejector via a pressurized liquid line 60. A liquid recycle line 500 couples the second separator 50 the an inlet 560 of the pump 56. By means of the liquid recycle line 500, a second liquid separated out from the fluid fraction in the second separator may be reused for pumping and pressurization of the gas. This liquid may also be defined as partially produced water. In one embodiment, the produced liquid is water. In one embodiment, the fluid fraction supplied to the second separator 50 is separated into a gas fraction, an oil fraction and a water fraction. The gas fraction is extracted via the gas extraction line 51, the oil fraction is extracted via the liquid extraction line 52 and the water is extracted via the liquid recycle line 500. Excess liquid (produced water) may be diverted to a liquid reservoir 23.The pump 56 may be any type of pump configured to pump liquids, such as a centrifugal pump or a piston pump. The pump 56 may for example be electrically or hydraulically driven.The pumped liquid act as a motive liquid in the ejector 62 for entrainment of gas from the second separator 50. The liquid is pressurized by the pump upstream of the ejector 62. In the ejector 62, the liquid is passed through a nozzle which increases a velocity and decreases a pressure of the liquid, also known as the venturi effect. At an outlet of the nozzle an area of low pressure is generated. The low pressure is less than that of a pressure of the gas in the second separator 50. Thus, the gas is sucked into the ejector 62 via the gas extraction line 51. The gas is entrained with the liquid inside the ejector 62 before a gas and liquid mixture is passed through a diffuser. The diffuser reduces the velocity and increases the pressure of the mixture. A pressurized mixture of gas and liquid is finally discharged via an outlet of the ejector 62.A gas/liquid mixture line 63 couples the outlet 622 of the ejector 62 to the first separator 10. The gas and liquid mixture are separated in a gas fraction and a liquid fraction in the first separator 10, and the liquid increases a pressure of the gas in the first separator 10. The liquid fraction is extracted via the fluid extraction line. In one embodiment, the liquid from the liquid reservoir is water. The liquid in the first separator 10 acts as a direct cooling medium of the gas during pressurization. This eliminates the need for additional gas cooling systems.Figure 2 shows the system 1, wherein the first module 2 comprises a third separator 24. The multiphase fluid is supplied to the third separator 24 and separated into a gas fraction and a fluid fraction comprising liquid and residual gas. The gas fraction is supplied to the first separator 10 via a gas transfer line 240 coupling an upper portion of the third separator 24 and the first separator 10. In this embodiment, the fluid extraction line 13 is coupled to the third separator 24 for extraction of the fluid fraction.Figure 2 further shows that the pump 56 is coupled to the first separator 10 via a direct pressurized liquid line 25. The direct pressurized liquid line 25 enables pumping of liquid directly to the first separator, thus bypassing the ejector 62. This embodiment is preferable for further increasing the pressure in the first separator. For example, gas in the first separator may reach a pressure of 50 bar by means of the ejector. By pumping liquid directly from the pump to the first separator, i.e. by-passing the ejector, the pressure can be increased to 150-200 bar. The system 1 is configured to control the routing of the liquid flow from the pump 56 to the first separator 10 (not shown).Figure 2 also shows that the first separator 10 is coupled to the inlet 560 of the pump 56 via a drain line 231. By means of the drain line 231, liquid from the first separator 10 can be supplied directly to the pump 56. Since the first separator 10 initially is supplied with liquid coming from the liquid reservoir 23, the properties of the liquid may be controlled. Thus, the liquid being extracted from the first separator 10 will not be contaminated and may be supplied to the pump 56 directly for reuse. The drain line 231 is also coupled to the liquid supply line 230 such that excess liquid may be extracted and stored in the reservoir 23. Figure 3 shows the system 1 comprising two coolers 55, 55’ and a gas scrubber 21. One cooler 55 is arranged upstream of the pump 56 and is configured to reduce the temperature of the liquid supplied to the pump 56. The cooled liquid will increase the cooling of the gas in the first separator 10 during pressurization. Another cooler 55’ is arranged along the gas transfer line 240 for cooling of the gas fraction from the third separator 24. The scrubber 21 is connected to the compressed gas line 15 for receiving compressed gas from the first separator 10. The scrubber 21 is configured to remove particles and condensate from the gas. The gas is extracted from the scrubber 21 and sent for export, gas lift or gas injection. Condensate from the cleaning process may be transferred to the second separator 50 via a condensation line 210.Figure 4 shows the system 1 comprising four first separators 10. Each of the four first separators 10 are coupled to gas transfer line 240 for receiving gas from the third separator 24. Each of the four first separators 10 are also coupled to the gas/liquid mixture line 63 for receiving the liquid and gas mixture from the ejector 62. Each of the four first separators 10 are further coupled to the drain line 231 for extracting liquid from the first separators 10.Figure 4 further shows the system 1 comprising two pumps 56, 56’, wherein both pumps 56, 56’ are coupled to the pressurized liquid line 60 for supplying pressurized liquid to the ejector 62. Each pump 56, 56’ is coupled to a direct pressurized liquid line 25, 25’, wherein each of the two direct pressurized liquid line 25, 25’ are coupled to two of the four first separators 10. Thus, one of the pumps 56 may pressurize the gas in a first pair of first separators 10, while the other pump 56’ may pressurize the gas in a second pair of first separators 10.For the purpose of the following description the four first separators 10 will be denoted primary, secondary, tertiary and quaternary. In operation, the first pump 56 pressurizes the gas in the primary separator and the secondary separator, whilst the second pump 56’ pressurizes the gas in the tertiary separator and the quaternary separator. There is a time delay of water filling of the primary separator and the tertiary separator in the sense that the gas in primary separator will reach a predetermined pressure prior to the gas in the tertiary separator. The compressed gas in the primary separator is then extracted via the compressed gas line 15. Once the primary separator is emptied for the gas, the gas in the tertiary separator will be at the predetermined pressure, ready to be extracted. Thus, gas delivery may continue uninterrupted. The second pump 56’ pressurizes the gas in the tertiary and quaternary separators. There is a time delay in the water filling of the secondary separator and the quaternary separator, similar to that of the primary separator and tertiary separator described above. The gas in the quaternary separator will be ready for extraction once the secondary separator is emptied. The process is then repeated to obtain continuous gas extraction.It should be noted that the sequence described above may be different in another embodiment, and the first cylinders may be controlled individually rather than in pairs. For example, a first and a second of the first separators is controlled independently of a third and a fourth of the first separators.It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design many alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. Use of the verb "comprise" and its conjugations does not exclude the presence of elements or steps other than those stated in a claim. The article "a" or "an" preceding an element does not exclude the presence of a plurality of such elements.The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.
Claims
C l a i m s1. A system (1) for compression of a gas separated from a multiphase fluid in a well stream (8), the multiphase fluid comprising at least liquid and gas, wherein the system (1) comprises:- a first module (2) comprising at least one first separator (10), the first module (2) being configured to receive the multiphase fluid and separate it into a first gas fraction and a fluid fraction comprising liquid and residual gas;- an ejector (62) having a first inlet (620), a second inlet (621) and an outlet (622), wherein the outlet (622) is coupled to the at least one first separator (10);- a second separator (50) coupled to the first module (2) for receiving said fluid fraction and separate it into a liquid fraction and a second gas fraction, the second separator (50) being coupled to the first inlet (620) of the ejector (62) for supplying the second gas fraction to the ejector (62);- a pump (56) having an inlet (560) and an outlet (561), the inlet (560) being coupled to a liquid reservoir (23) for supplying liquid to the pump (56), the outlet (561) being coupled to the second inlet (621) of the ejector (62) for supplying a pressurized liquid to the ejector (62), wherein the second gas fraction is entrained with the pressurized liquid in the ejector (62) and supplied to the at least one first separator (10) via the outlet (622) of the ejector, c h a r a c t e r i z e d i n that a compressed gas line (15) is coupled to the at least one first separator (10) for directly extracting compressed gas from the system, wherein the gas in the at least on first separator (10) is compressed and pressurized by the pressurized liquid from the pump (56).2. The system (1) according to claim 1, further comprising a third separator arranged in the first module, wherein the separation of the multiphase fluid is carried out in the third separator, the third separator being coupled to the at least one first separator (10) and the second separator (50), wherein the first gas fraction is supplied to the at least one first separator and the fluid fraction comprising liquid and residual gas is supplied to the second separator (50).3. The system (1) according to claim 2, wherein the inlet of the pump (56) is coupled to the at least one first separator (10) for supplying liquid from the at least one first separator (10) to the pump (56).4. The system (1) according to any of the preceding claims, wherein the outlet of the pump (56) is also coupled directly to the at least one first separator (10) by means of pressurized liquid line (25) bypassing the ejector (62).5. The system (1) according to any of the preceding claims, further comprising a scrubber (21) coupled to the compressed gas line (15).6. The system according to any of the preceding claims, further comprising a cooler (55) for cooling the liquid to the pump (56).7. The system (1) according to any of the preceding claims, wherein the first module comprises four first separators (10).8. A method for compression of gas separated from a multiphase fluid from a well stream (8), the method comprising the steps of:- separation of the multiphase fluid in a first module to obtain a first gas fraction and a liquid fraction containing gas;- separation of the liquid fraction containing gas to obtain a second gas fraction and a liquid fraction; and- pumping a liquid to obtain a pressurized liquid;- entraining the second gas fraction with the pressurized liquid by means of an ejector (62) to obtain a mixture of liquid and gas, c h a r a c t e r i s e d i n that the method further comprises the steps of:- supplying said mixture to the first module to compress and pressurize the first gas fraction, and- directly extracting the compressed and pressurized gas from the system in the first separator.Patentkrav1. System (1) for komprimering av en gass separert fra et flerfasefluid i en brønnstrøm (8), hvor flerfasefluidet omfatter minst væske og gass, hvori systemet (1) omfatter: - en første modul (2) omfattende minst én første separator (10), hvor den første modulen (2) er konfigurert til å motta flerfasefluidet og separere det i en første gassfraksjon og en fluidfraksjon omfattende væske og restgass;- en ejektor (62) med et første innløp (620), et andre innløp (621) og et utløp (622), hvori utløpet (622) er koblet til den minst ene første separatoren (10);- en andre separator (50) koblet til den første modulen (2) for å motta nevnte fluidfraksjon og separere den i en væskefraksjon og en andre gassfraksjon, hvor den andre separatoren (50) er koblet til ejektorens (62) første innløp (620) for å tilføre den andre gassfraksjonen til ejektoren (62);- en pumpe (56) med et innløp (560) og et utløp (561), hvor innløpet (560) er koblet til et væskereservoar (23) for å tilføre væske til pumpen (56), utløpet (561) er koblet til ejektorens (62) andre innløp (621) for å tilføre en trykksatt væske til ejektoren (62), hvori den andre gassfraksjonen rives med den trykksatte væsken i ejektoren (62) og tilføres den minst ene første separator (10) via ejektorens utløp (622), k a r a k -t e r i s e r t v e d at en ledning (15) for komprimert gass er koblet til den minst ene første separatoren (10) for direkte ekstrahering av komprimert gass fra systemet, hvori gassen i den minste på første separatoren (10) komprimeres og trykksettes av den trykksatte væsken fra pumpen (56).2. System (1) ifølge krav 1, videre omfattende en tredje separator anordnet i den første modulen, hvori separeringen av flerfasefluidet utføres i den tredje separatoren, idet den tredje separatoren er koblet til den minst ene første separatoren (10) og den andre separatoren (50), hvori den første gassfraksjonen tilføres den minst ene første separatoren, og fluidfraksjonen omfattende væske og restgass tilføres den andre separatoren (50).3. System (1) ifølge krav 2, hvori pumpens (56) innløp er koblet til den minst ene første separatoren (10) for å tilføre væske fra den minst ene første separatoren (10) til pumpen (56).4. System (1) ifølge hvilket som helst av de foregående kravene, hvori pumpens (56) utløp også er koblet direkte til den minst ene første separatoren (10) ved hjelp av trykksatt væskeledning (25) som går utenom ejektoren (62).5. System (1) ifølge hvilket som helst av de foregående kravene, videre omfattende en væskeutskiller (21) koblet til ledningen (15) for komprimert gass.6. System ifølge hvilket som helst av de foregående kravene, videre omfattende en kjøler (55) for kjøling av væsken til pumpen (56).7. System (1) ifølge hvilket som helst av de foregående kravene, hvori den første modulen omfatter fire første separatorer (10).8. Fremgangsmåte for komprimering av gass separert fra et flerfasefluid fra en brønnstrøm (8), hvor fremgangsmåten omfatter trinnene:- separering av flerfasefluidet i en første modul for å oppnå en første gassfraksjon og en væskefraksjon inneholdende gass;- separering av væskefraksjonen inneholdende gass for å oppnå en andre gassfraksjon og en væskefraksjon;- pumping av en væske for å oppnå en trykksatt væske; og- medriving av den andre gassfraksjonen med den trykksatte væsken ved hjelp av en ejektor (62) for å oppnå en blanding av væske og gass, k a r a k t e r i s e r t v e d at fremgangsmåten videre omfatter stegene:- forsyning av nevnte blanding til den første modulen for å komprimere og trykksette den første gassfraksjonen, og- direkte ekstrahering av den komprimerte og trykksatte gassen fra systemet i den første separatoren.
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IPC classesB01D 17/00B01D 17/02B01D 17/04E21B 43/00E21B 43/34CPC classesB01D 17/00B01D 17/02B01D 17/0208B01D 17/0217B01D 17/04E21B 43/00E21B 43/34

Citations

SU 1611369 A (A)NO 340513 B1 (B1)RU 2297520 C2 (C2)RU 2422630 C1 (C1)WO 0075510 A2 ( A2)

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STRAEN ENERGY AS
Fabrikkveien 10 4033 STAVANGER NO (STAVANGER Municipality, Rogaland county)Org. number: 819829322Inventors
Arild Aarskog
Rosenberggata 68 4007 STAVANGER NO (STAVANGER Municipality, Rogaland county)

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HÅMSØ PATENTBYRÅ AS
HÅMSØ PATENTBYRÅ AS

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