Importance

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Abstract

A pressure reduction turbine for a hydrocarbon well stream driving a hydraulic pump, and the turbine has two cog wheels mounted laterally to a well stream. A deflector plate is positioned at the well inlet to split and direct the well stream towards the outsides of the cogwheels and to drive them with opposite rotation. The turbine is designed to give a large pressure drop. Ceramics is used in the turbine housing, in the turbine inlet and in the turbine outlet, to withstand erosion wear. A hydraulic pump is supplied with collective torque via the turbine shaft, supported by two journal bearings and is connected to the pump via a dynamic sealing arrangement. Alternatively the torque from the turbine may be transmitted by to the pump without the dynamic seal, via a magnet coupling. In an underwater implementation the turbine with the pump are equipped with an arrangement for connection or disconnection via an underwater tool system, so that the equipment may be pulled and installed from a surface vessel. The hydraulic pump leads hydraulic oil at high pressure out into a piping system where hydraulic energy, possibly from several such power sources, is led to a common hydraulic motor driving an electric generator. In a surface implementation the generator is positioned in a non-explosive environment, for example in an overpressure container.

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First Claim