Subsea production system
AssigneeAker Kvaerner Subsea AS
InventorGeir Inge Olsen
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Abstract
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.
Claims48
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.
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.
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.
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.
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.
Dependencies are inferred from the claim text.