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Methods and arrangements for production of petroleum products from a subsea well. The methods comprise control of a downhole separator, supplying power fluid to a downhole turbine/pump hydraulic converter, performing pigging of a subsea manifold, providing gas lift and performing three phase downhol

Methods and arrangements for production of petroleum products from a subsea well. The methods comprise control of a downhole separator, supplying power fluid to a downhole turbine/pump hydraulic converter, performing pigging of a subsea manifold, providing gas lift and performing three phase downhole separation. Arrangement for performing the methods are also described.

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The invention claimed is: 1. A method of controlling a downhole separator, for separating hydrocarbons and water, the hydrocarbons leaving the separator flowing through a x-mas tree and a first header in a manifold, the method comprising: using a power fluid to drive a downhole turbine/pump hydraul

The invention claimed is: 1. A method of controlling a downhole separator, for separating hydrocarbons and water, the hydrocarbons leaving the separator flowing through a x-mas tree and a first header in a manifold, the method comprising: using a power fluid to drive a downhole turbine/pump hydraulic converter, operating the pump in the downhole turbine/pump hydraulic converter to pump separated water, feeding the power fluid for the downhole turbine/pump hydraulic converter through a second header in the manifold, an adjustable valve and a x-mas tree to the turbine in the downhole turbine/pump hydraulic converter, and controlling the rate of pumping by the rate of the power fluid based on at least one of measures of water level in the separator, flow-split and at least one of oil and water entrainment of the separated phases. 2. The method of claim 1, characterized in that the rate of pumping of separated water is controlled by a charge pump in communication with the second header. 3. A method of supplying power fluid to a turbine/pump hydraulic converter, the method comprising the steps of: providing a manifold having a first and a second header, providing communication between the first header and a well fluid line in the well bore, providing communication between the second header and the turbine of the downhole turbine/pump hydraulic converter wherein the turbine/pump hydraulic converter is positioned in a downhole location, and supplying power fluid to the turbine through the second header at a pressure higher than a well pressure. 4. The method of claim 3, characterized in that water from the pump in the downhole turbine/pump hydraulic converter is used for injection in a formation. 5. The method of claim 3, wherein surrounding seawater is used as power fluid and is either injected into a reservoir together with separated produced water or returned to the seabed and discharged to the surrounding sea. 6. The method of claim 3, wherein the power fluid is extracted from a formation and is free flowing from an aquifer to the seabed or pumped to the seabed using a downhole electrical operated pump or a second downhole turbine/pump hydraulic converter. 7. The method of claim 3, wherein the power fluid is circulated in a closed loop with pressure increased by use of a seabed located charge pump and that the power fluid is returned to the manifold in a third header. 8. The method of claim 3, characterized in that the power fluid is separated oil pressurized by a charge pump and routed to the downhole turbine in the downhole turbine/pump hydraulic converter and that the power fluid is discharged to the well fluid brought to the manifold at the seabed. 9. A subsea petroleum production arrangement for producing hydrocarbons from a plurality of wells, comprising a manifold having a first and a second header and isolating valves for isolating the first or the second header from the respective wells, at least the first header being in selective fluid communication, via a respective adjustable valve and a respective x-mas tree, with respective hydrocarbon transporting lines in the wells, for transportation of hydrocarbons, at least one of the wells having a downhole separator for separating hydrocarbons and water and a dowrihole turbine/pump hydraulic converter for pumping separated water, characterized in that the second header is in communication with a power fluid supply line, and via a power fluid adjustable valve in further communication with a turbine in the downhole turbine/pump hydraulic converter. 10. The arrangement of claim 9, characterized in that the second header is in communication with a power fluid source on an offshore installation or onshore. 11. The arrangement of claim 9, characterized in that the second header is in communication with a power fluid source of a subterranean well. 12. The arrangement of claim 9, wherein the power fluid is water. 13. The arrangement of claim 9, wherein a subsea charge pump is provided for pressurizing the power fluid before entering the wells. 14. The arrangement of claim 13, characterized in that the second header is in communication with the surrounding seawaters, and that seawater is used as power fluid. 15. The arrangement of claim 12, wherein the discharge side of the turbine in the downhole turbine/pump hydraulic converter is in communication with the discharge side of the pump of the downhole turbine/pump hydraulic converter. 16. The arrangement of claim 15, wherein the discharge side of the turbine and the pump of the downhole turbine/pump hydraulic converter is in communication with an injection zone in a formation being injected with water. 17. The arrangement of claim 9, wherein the discharge side of the pump in the downhole turbine/pump hydraulic converter is in communication with a return line returning the power fluid to the surface or seabed. 18. The arrangement of claim 17, characterized in that the return line is in communication with a third header in communication with the charge pump, to return the power fluid to the inlet side of the charge pump. 19. The arrangement of claim 17, characterized in that the return line is in communication with the surrounding seawaters to discharge the power fluid into the seawaters. 20. The arrangement of claim 10, characterized in that a second pump is provided in the subterranean power fluid source well. 21. The arrangement of claim 20, characterized in that the second pump is an electrically driven pump. 22. The arrangement of claim 20, characterized in that the second pump is driven by a separate power fluid source. 23. The arrangement of claim 13, wherein the second pump is a downhole turbine/pump hydraulic converter, the turbine of the second downhole turbine/pump hydraulic converter being in communication with the discharge side of the charge pump. 24. The arrangement of claim 9, wherein the power fluid comprises hydrocarbons, and wherein the first header is in communication with the second header via the charge pump. 25. The arrangement of claim 24, characterized in that the discharge side of the pump of the downhole turbine/pump hydraulic converter is in communication with the hydrocarbon transporting line. 26. The arrangement of claim 9, wherein isolation valves are provided to isolate the second header from the power fluid lines and open communication between the second header and the hydrocarbon transporting lines, thereby enabling transportation of hydrocarbons in both headers. 27. The arrangement of claim 9, wherein isolation valves are provided to isolate the power fluid lines from the second header, open communication between the first header and the power fluid lines, isolate the hydrocarbon transporting lines from the first header and open communication between the hydrocarbon transporting lines and the second header, to enable hydrocarbon transport in the second header and power fluid transport in the first header or vice versa. 28. An arrangement for controlling a downhole separator, for separating hydrocarbons and water, comprising a manifold having a first and a second header and isolating valves for isolating the first or the second header from the respective wells, at least the first header being in selective fluid communication, via a respective adjustable valve and a respective x-mas tree, with respective hydrocarbon transporting lines in the wells, for transportation of hydrocarbons, at least one of the wells having a downhole separator for separating hydrocarbons and water and a downhole turbine/pump hydraulic converter for pumping separated water, characterized in that the second header is in communication with a power fluid supply, and via a power fluid adjustable valve in further communication with a turbine in the downhole turbine/pump hydraulic converter. 29. The arrangement of claim 28, characterized in that a charge pump is coupled to the second header, for pressurizing the power fluid. 30. The method of claim 3, wherein the power fluid is used to drive a turbine in a turbine/pump hydraulic converter for boosting the pressure of the production fluid or the well fluid. 31. The method of claim 30, characterized in that the power fluid is used to drive a first turbine/pump hydraulic converter for pumping separated seawater and also for driving a second turbine in a turbine/pump converter for boosting the pressure of the production fluid and that the first and second turbines are controlled by dedicated subsea adjustable valves. 32. The method of claim 30, characterized in that the power fluid is used to drive a first turbine in a turbine/pump hydraulic converter for pumping separated seawater and also for driving a second turbine in a turbine/pump converter for boosting the pressure of the production fluid and that the second turbine is controlled by a downhole adjustable valve or fixed restriction. 33. A subsea petroleum production arrangement for producing hydrocarbons from a plurality of wells, comprising a manifold having a first and a second header and isolating valves for isolating the first or the second header from the respective wells, at least the first header being in selective fluid communication, via a respective adjustable valve and a respective x-mas tree, with respective hydrocarbon transporting lines in the wells, for transportation of hydrocarbons, at least one of the wells having a downhole turbine/pump hydraulic converter, characterized in that the second header is in communication with a power fluid supply, and via a power fluid adjustable valve in further communication with a turbine in the downhole turbine/pump hydraulic converter and that the pump of the turbine/pump hydraulic converter is pumping well fluid or production fluid. 34. The arrangement of claim 33, wherein a respective dedicated subsea adjustable valve is provided in the power fluid line for the turbine of the turbine/pump converter pumping well fluid or production fluid and the turbine of the turbine/pump converter pumping separated water. 35. The arrangement of claim 33, wherein a downhole adjustable valve or fixed restriction is provided in the power fluid line for the turbine of the turbine/pump converter pumping well fluid or production fluid. 36. The method of claim 1, wherein the water from the pump in the downhole turbine/pump hydraulic converter is used for injection in the formation. 37. The method of claim 1, wherein surrounding seawater is used as power fluid and is either injected into the reservoir together with the separated produced water or returned to the seabed and discharged to the surrounding sea. 38. The method of claim 1, wherein the power fluid is extracted from a formation and is free flowing from an aquifer to the seabed or pumped to the seabed using a downhole electrical operated pump or a downhole turbine/pump hydraulic converter. 39. The method of claim 1, wherein the power fluid is circulated in a closed loop with pressure increase by use of a seabed located charge pump and wherein the power fluid is returned to the manifold in a third header. 40. The method of claim 1, wherein the power fluid is separated oil pressurized by a charge pump and routed to the downhole turbine in the downhole turbine/pump hydraulic converter and wherein the power fluid is discharged to the well fluid brought to the manifold at the seabed. 41. The arrangement of claim 20, wherein the second pump is a downhole turbine/pump hydraulic converter, the turbine of the second downhole turbine/pump hydraulic converter being in communication with the discharge side of the charge pump. 42. The arrangement of claim 13, wherein the power fluid comprises hydrocarbons and wherein the first header is in communication with the second header via the charge pump. 43. The arrangement of claim 9, wherein a respective dedicated subsea adjustable valve is provided in the power fluid line for the turbine of the turbine/pump converter pumping well fluid or production fluid and wherein the turbine of the turbine/pump converter pumps separated water. 44. The arrangement of claim 26, wherein a respective dedicated subsea adjustable valve is provided in the power fluid line for the turbine of the turbine/pump converter pumping well fluid or production fluid and wherein the turbine of the turbine/pump converter pumps separated water. 45. The arrangement of claim 27, wherein a respective dedicated subsea adjustable valve is provided in the power fluid line for the turbine of the turbine/pump converter pumping well fluid or production fluid and wherein the turbine of the turbine/pump converter pumps separated water. 46. The arrangement of claim 9, wherein a downhole adjustable hole or fixed restriction is provided in the power fluid line for the turbine of the turbine/pump converter pumping well fluid or production fluid. 47. The arrangement of claim 26, wherein a downhole adjustable hole, or fixed restriction is provided in the power fluid line for the turbine of the turbine/pump converter pumping well fluid or production fluid. 48. The arrangement of claim 27, wherein a downhole adjustable hole or fixed restriction is provided in the power fluid line for the turbine of the turbine/pump converter pumping well fluid or production fluid.