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A method for reversible temperature sensitive control of the flow of fluid in oil and/or gas production, involves a control device or an autonomous valve operating by the Bernoulli principle and includes a moveable disk or body provided within a housing for opening and closing the valve, involving u

A method for reversible temperature sensitive control of the flow of fluid in oil and/or gas production, involves a control device or an autonomous valve operating by the Bernoulli principle and includes a moveable disk or body provided within a housing for opening and closing the valve, involving use of the Curie-effect in order to position the body in a preferred position within the housing at a temperature below a certain, preferred transition or Curie temperature. An apparatus for reversible temperature sensitive control of the flow of fluid in oil and/or gas production including a control device or an autonomous valve operating by the Bernoulli principle and including a moveable disk or body provided within a housing for opening and closing the valve, the body and housing including a ferromagnetic material having a certain, preferred Curie temperature, the temperature being selected in order to position the body in a preferred position in the housing during installation or operation.

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1. A flow control device for controlling the flow of fluid from an oil and/or gas reservoir of a well into a production pipe positioned within the reservoir, the flow control device comprising a movable body provided within a housing, the movable body being arranged to adjust the flow of fluid throu

1. A flow control device for controlling the flow of fluid from an oil and/or gas reservoir of a well into a production pipe positioned within the reservoir, the flow control device comprising a movable body provided within a housing, the movable body being arranged to adjust the flow of fluid through the control device autonomously by utilizing the Bernoulli principle, the housing comprising first ferromagnetic material having a first Curie temperature, the body comprising second ferromagnetic material having a second Curie temperature, and at least one of the first and second ferromagnetic material forming a permanent magnet, with the Curie-effect acting so as to hold the body in a predetermined position within the housing at a temperature below the lower of the first and second Curie temperatures, the predetermined position being either an open position or a closed position, and so as to allow the body to move freely at a temperature above the lower Curie temperature, said lower Curie temperature being selected in order to hold the body in the predetermined position in the housing during installation of a said production pipe comprising the flow control device into the well. 2. The flow control device as claimed in claim 1, wherein the body defines part of a flow path through the control device, wherein changes in velocity and/or composition of the fluid flowing along the flow path cause a flow-through area (A2) between the body and a predetermined part of the housing to reduce or increase as a result of the Bernoulli principle, thereby acting autonomously to adjust the flow of fluid through the control device at a temperature above the lower Curie temperature. 3. The flow control device as claimed in claim 2, wherein the predetermined part of the housing forms a valve seat against which the body bears against when in the closed position. 4. The flow control device as claimed in claim 3, wherein, in the case where the predetermined position is a closed position, at least part of the housing that is on the same side of the body as the valve seat comprises the first ferromagnetic material. 5. The flow control device as claimed in claim 4, wherein the housing that forms or is adjacent to the valve seat comprises the first ferromagnetic material. 6. The flow control device as claimed in claim 3, wherein, in the case where the predetermined position is an open position, at least part of the housing that is on the opposite side of the body to the valve seat comprises the first ferromagnetic material. 7. The flow control device as claimed in claim 1, wherein the first ferromagnetic material forms a permanent magnet. 8. A method of installing a production pipe in a well, the method comprising: providing the production pipe having a flow control device to control the flow of fluid from an oil and/or gas reservoir of the well into the production pipe positioned within the reservoir, the flow control device comprising a movable body provided within a housing and arranged to adjust the flow of fluid through the control device autonomously by utilizing the Bernoulli principle, the housing comprising first ferromagnetic material having a first Curie temperature, the body comprising second ferromagnetic material having a second Curie temperature, and at least one of the first and second ferromagnetic material forming a permanent magnet, and the flow control device to use the Curie-effect to hold the body in a predetermined position within the housing at a temperature below the lower of the first and second Curie temperatures, the predetermined position being either an open position or a closed position, and to allow the body to move freely at a temperature above the lower Curie temperature; andinstalling the production pipe into the well, said lower Curie temperature to hold the body in the predetermined position in the housing during the installation. 9. A method of controlling the flow of fluid from an oil and/or gas reservoir of a well into a production pipe positioned within the reservoir, comprising the steps of: providing the production pipe with a flow control device comprising a movable body provided within a housing, the movable body being arranged to adjust the flow of fluid through the control device autonomously by utilizing the Bernoulli principle, the housing comprising first ferromagnetic material having a first Curie temperature, the body comprising second ferromagnetic material having a second Curie temperature, and at least one of the first and second ferromagnetic material forming a permanent magnet, with the Curie-effect to act so as to hold the body in a predetermined position within the housing at a temperature below the lower of the first and second Curie temperatures, the predetermined position being either an open position or a closed position, and so as to allow the body to move freely at a temperature above the lower Curie temperature;installing the production pipe in the well, said lower Curie temperature to hold the body in the predetermined position in the housing during the installation; andcontrolling the flow of fluid from the oil and/or gas reservoir of the well by the flow control device. 10. The method as claimed in claim 9, wherein the lower Curie temperature is chosen to be between ambient temperature and a temperature of the fluid in the reservoir, or at least one of the constituents thereof. 11. The method as claimed in claim 9, wherein at least one of the first and second ferromagnetic materials comprises ferrimagnetic material. 12. The method as claimed in claim 9, wherein the Curie-effect acts so as to tend to position the body in the predetermined position, even if it does not position the body in the predetermined position due to contrary Bernoulli-related forces acting on the body caused by fluid flow. 13. A method for reversible temperature sensitive control of the flow of fluid in oil and/or gas production, involving a control device or an autonomous valve operating by the Bernoulli principle and comprising a moveable disk or body provided within a housing for opening and closing said valve, the method comprising: the step of involving use of the Curie-effect in order to position said body in a position within said housing at a temperature below a certain, transition temperature or Curie temperature,the step of selecting a ferromagnetic material for the body and the housing which has the Curie temperature, andthe step of selecting a material with a Curie temperature between ambient and well temperature. 14. The method in accordance with claim 13, wherein, in order to have the body in closed position at installation, further comprising the step of selecting a body material that is magnetic at low temperatures and that turns non-magnetic when reaching the temperature of the reservoir. 15. The method in accordance with claim 14, wherein the step of selecting the body material that is magnetic at low temperatures and that turns non-magnetic when reaching the temperature of the reservoir includes selecting a ferromagnetic or permanent magnetic material as valve seat material that the body should bear against. 16. The method in accordance with claim 13, wherein, in order to have the body in open position at installation, further comprising the step of selecting a body material that is magnetic at low temperatures and that turns non-magnetic when reaching the temperature of the reservoir, preferably by selecting a ferromagnetic or permanent magnetic material as housing material to keep the valve open during e.g. installation. 17. An apparatus for reversible temperature sensitive control of the flow of fluid in oil and/or gas production from a well, comprising a control device or an autonomous valve operating by the Bernoulli principle and comprising a moveable disk or body provided within a housing for opening and closing said device or valve, said body and housing comprising a ferromagnetic material having a certain Curie temperature, said temperature being selected in order to hold the body in a position in the housing during installation of a production pipe comprising the device or valve into the well. 18. The apparatus in accordance with claim 17, wherein the material is a material with a Curie temperature between ambient and well temperature. 19. The apparatus in accordance with claim 17, wherein a material selected for a valve seat is a ferromagnetic or permanent magnetic material. 20. The apparatus in accordance with claim 17, wherein the material selected for the housing is a permanent magnetic material. 21. The apparatus in accordance with claim 17, wherein the housing is an integral part of a pipe wall, in the form of a recess in said wall. 22. The apparatus in accordance with claim 17, wherein the housing is a separate housing body arranged or to be arranged in a pipe wall. 23. The apparatus in accordance with claim 17, wherein said body facing the outlet of an aperture or hole in the centre of the recess or housing body and being held in place in the recess or housing body by means of a holder device or arrangement thereby forming a flow path where the fluid enters the valve through the central aperture or inlet flowing towards and along the body and out of the recess or housing. 24. The apparatus in accordance with claim 23, wherein the shape of the body is selected from a group comprising: Conical, frustoconical, hemispherical, disc-shaped and possible variants or combinations thereof.