Separation and capture of liquids of a multiphase flow

1. An assembly for separation of a multiphase flow, comprising:

at least one compact cyclone based separation unit, chosen from an in-line deliquidiser and an in-line phase splitter, where said compact cyclone based separation unit is arranged to receive multiphase flow via an inlet for separation thereof to a gas flow and a mainly liquid containing flow;

a gas outlet arranged to receive the gas flow from the compact cyclone based separation unit and any additional gas flows;

at least one conduit separator, arranged to receive the mainly liquid containing flow from compact cyclone based separation unit and any additional liquid containing flows, having an outlet for liquid from the at least one conduit separator in a low-lying part thereof; and

at least one or more of an additional conduit separator with declining slope/incline seen along the direction of flow and arranged downstream and at a lower level than the at least one conduit separator, in order to obtain additional separation effect.

2. The assembly according to claim 1 , wherein the at least one compact cyclone based separation unit is an in-line deliquidiser.

3. The assembly according to claim 2 , further comprising a pump or control valve arranged in said outlet for liquid, said pump or control valve is controlled by a level of said liquid in the at least one conduit separator.

4. The assembly according to claim 2 , further comprising a phase splitter arranged up-stream of the deliquidiser to receive the multiphase flow for coarse separation thereof to a mainly gas containing flow that is supplied/delivered via an outlet for mainly gas from said phase splitter to the deliquidiser and a mainly gas containing flow that is supplied/delivered to the at least one conduit separator.

5. The assembly according to claim 1 , the at least one conduit separator having a length and wherein the at least one conduit separator has a declining slope/incline along the direction of flow throughout at least part of the length.

6. An assembly for separation of a multiphase flow, comprising:

at least one compact cyclone based separation unit in the form of an in-line deliquidiser, where said compact cyclone based separation unit is arranged to receive multiphase flow via an inlet for separation thereof to a gas flow and a mainly liquid containing flow;

a gas outlet arranged to receive the gas flow from the compact cyclone based separation unit and any additional gas flows;

at least one conduit separator, arranged to receive the mainly liquid containing flow from the compact cyclone based separation unit and any additional liquid containing flows, having an outlet for liquid from the at least one conduit separator in a low-lying part thereof; and

a phase splitter arranged up-stream of the deliquidiser to receive the multiphase flow for coarse separation thereof to a mainly gas containing flow that is supplied/delivered to the deliquidiser and a mainly gas containing flow that is supplied/delivered via an outlet for mainly gas from said splitter to the at least one conduit separator;

wherein a third conduit separator is arranged between said outlet for mainly gas from the phase splitter and the deliquidiser so that gas is supplied/delivered from the third conduit separator to the deliquidiser and liquid is delivered from the third conduit separator to the at least one conduit separator.

7. The assembly according to claim 6 , wherein the at least one compact cyclone based separation unit is an in-line deliquidiser.

8. The assembly according to claim 7 , further comprising a pump or control valve arranged in said outlet for liquid, said pump or control valve is controlled by a level of said liquid in the at least one conduit separator.

9. The assembly according to claim 6 , the at least one conduit separator having a length and wherein the at least one conduit separator has a declining slope/incline along the direction of flow throughout at least part of the length.

10. An assembly for separation of a multiphase flow, comprising:

at least one compact cyclone based separation unit, chosen from an in-line deliquidiser and an in-line phase splitter, where said compact cyclone based separation unit is arranged to receive multiphase flow via an inlet for separation thereof to a gas flow and a mainly liquid containing flow;

a gas outlet arranged to receive the gas flow from the compact cyclone based separation unit and any additional gas flows;

at least one conduit separator, arranged to receive the mainly liquid containing flow from the compact cyclone based separation unit and any additional liquid containing flows, having an outlet for liquid from the at least one conduit separator in a low-lying part thereof; and

an ejector arranged in connection to said at least one conduit separator to guide liquid from said deliquidiser into said at least one conduit separator.

11. The assembly according to claim 10 , wherein the at least one compact cyclone based separation unit is an in-line deliquidiser.

12. The assembly according to claim 11 , further comprising a pump or control valve arranged in said outlet for liquid, said pump or control valve is controlled by a level of said liquid in the at least one conduit separator.

13. The assembly according to claim 11 , further comprising a phase splitter arranged up-stream of the deliquidiser to receive the multiphase flow for coarse separation thereof to a mainly gas containing flow that is supplied/delivered via an outlet for mainly gas from said phase splitter to the deliquidiser and a mainly gas containing flow that is supplied/delivered to the at least one conduit separator.

14. The assembly according to claim 10 , the at least one conduit separator having a length and wherein the at least one conduit separator has a declining slope/incline along the direction of flow throughout at least part of the length.

15. An assembly for separation of a multiphase flow, comprising:

an inlet at least one compact cyclone based separation unit, chosen from an in-line deliquidiser and an in-line phase splitter, where said compact cyclone based separation unit is arranged to receive multiphase flow via the inlet for separation thereof to a gas flow and a mainly liquid containing flow;

a gas outlet arranged to receive the gas flow from the compact cyclone based separation unit and any additional gas flows;

at least one conduit separator, arranged to receive the mainly liquid containing flow from the compact cyclone based separation unit and any additional liquid containing flows, having an outlet for liquid from the at least one conduit separator in a low-lying part thereof; and

at least one HIPPS/SIPPS valve for overpressure protection arranged in the inlet of the assembly.

16. The assembly according to claim 15 , wherein the at least one compact cyclone based separation unit is an in-line deliquidiser.

17. The assembly according to claim 16 , further comprising a pump or control valve arranged in said outlet for liquid, said pump or control valve is controlled by a level of said liquid in the at least one conduit separator.

18. The assembly according to claim 16 , further comprising a phase splitter arranged up-stream of the deliquidiser to receive the multiphase flow for coarse separation thereof to a mainly gas containing flow that is supplied/delivered via an outlet for mainly gas from said phase splitter to the deliquidiser and a mainly gas containing flow that is supplied/delivered to the at least one conduit separator.

19. The assembly according to claim 15 , the at least one conduit separator having a length and wherein the at least one conduit separator has a declining slope/incline along the direction of flow throughout at least part of the length.

20. An assembly for separation of a multiphase flow, comprising:

at least one compact cyclone based separation unit, chosen from an in-line deliquidiser and an in-line phase splitter, where said compact cyclone based separation unit is arranged to receive multiphase flow via an inlet for separation thereof to a gas flow and a mainly liquid containing flow;

a gas outlet arranged to receive the gas flow from the compact cyclone based separation unit and any additional gas flows;

at least one conduit separator, arranged to receive the mainly liquid containing flow from the compact cyclone based separation unit and any additional liquid containing flows, having an outlet for liquid from the at least one conduit separator in a low-lying part thereof; and

at least one in-line desander arranged in connection to the at least one conduit separator.

21. The assembly according to claim 20 , wherein the at least one compact cyclone based separation unit is an in-line deliquidiser.

22. The assembly according to claim 21 , further comprising a pump or control valve arranged in said outlet for liquid, said pump or control valve is controlled by a level of said liquid in the at least one conduit separator.

23. The assembly according to claim 21 , further comprising a phase splitter arranged up-stream of the deliquidiser to receive the multiphase flow for coarse separation thereof to a mainly gas containing flow that is supplied/delivered via an outlet for mainly gas from said phase splitter to the deliquidiser and a mainly gas containing flow that is supplied/delivered to the at least one conduit separator.

24. The assembly according to claim 20 , the at least one conduit separator having a length and wherein the at least one conduit separator has a declining slope/incline along the direction of flow throughout at least part of the length.

25. An assembly for separation of a multiphase flow, comprising:

at least one compact cyclone based separation unit, chosen from an in-line deliquidiser and an in-line phase splitter, where said compact cyclone based separation unit is arranged to receive multiphase flow via an inlet for separation thereof to a gas flow and a mainly liquid containing flow;

a gas outlet arranged to receive the gas flow from the compact cyclone based separation unit and any additional gas flows;

at least one conduit separator, arranged to receive the mainly liquid containing flow from the compact cyclone based separation unit and any additional liquid containing flows, having an outlet for liquid from the at least one conduit separator in a low-lying part thereof; and

at least one in-line degasser arranged downstream the at least one conduit separator or in connection to the possible additional conduit separator, with supply/delivery of separated gas to the gas outlet from the assembly.

26. The assembly according to claim 25 , wherein the at least one compact cyclone based separation unit is an in-line deliquidiser.

27. The assembly according to claim 26 , further comprising a pump or control valve arranged in said outlet for liquid, said pump or control valve is controlled by a level of said liquid in the at least one conduit separator.

28. The assembly according to claim 26 , further comprising a phase splitter arranged up-stream of the deliquidiser to receive the multiphase flow for coarse separation thereof to a mainly gas containing flow that is supplied/delivered via an outlet for mainly gas from said phase splitter to the deliquidiser and a mainly gas containing flow that is supplied/delivered to the at least one conduit separator.

29. The assembly according to claim 25 , the at least one conduit separator having a length and wherein the at least one conduit separator has a declining slope/incline along the direction of flow throughout at least part of the length.