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A gas turbine engine fan blade (26) comprises a root portion (40) and an aerofoil portion (42). The aerofoil portion (42) has a leading edge (44), a trailing edge (46), a concave metal wall portion (50) extending from the leading edge (44) to the trailing edge (46) and a convex metal wall portion (5

A gas turbine engine fan blade (26) comprises a root portion (40) and an aerofoil portion (42). The aerofoil portion (42) has a leading edge (44), a trailing edge (46), a concave metal wall portion (50) extending from the leading edge (44) to the trailing edge (46) and a convex metal wall portion (52) extending from the leading edge (44) to the trailing edge (46). The aerofoil portion (42) has a hollow interior (54) and the interior (54) of the aerofoil portion (42) is at least partially filled with a vibration damping material (56). The vibration damping material (56) comprises a material having viscoelasticity for example one formed by mixing an amine terminated polymer and bisphenol a-epichlorohydrin epoxy resin.

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A gas turbine engine fan blade (26) comprises a root portion (40) and an aerofoil portion (42). The aerofoil portion (42) has a leading edge (44), a trailing edge (46), a concave metal wall portion (50) extending from the leading edge (44) to the trailing edge (46) and a convex metal wall portion (5

A gas turbine engine fan blade (26) comprises a root portion (40) and an aerofoil portion (42). The aerofoil portion (42) has a leading edge (44), a trailing edge (46), a concave metal wall portion (50) extending from the leading edge (44) to the trailing edge (46) and a convex metal wall portion (52) extending from the leading edge (44) to the trailing edge (46). The aerofoil portion (42) has a hollow interior (54) and the interior (54) of the aerofoil portion (42) is at least partially filled with a vibration damping material (56). The vibration damping material (56) comprises a material having viscoelasticity for example one formed by mixing an amine terminated polymer and bisphenol a-epichlorohydrin epoxy resin. in direct communication with an annulus between the string of casing and the outer surface of the conduit. 7. The well of claim 1 wherein the gas separator is below and spaced away from the submersible pump assembly. 8. A well, comprising: a string of casing extending into a well: a packer sealingly engaging the casing; a conduit extending into the well, the conduit having a lower portion sealingly engaging the packer, the conduit having an opening in its lower portion for receiving well fluid from below the packer; a gas separator located in the conduit for separating gas from the well fluid, the separator having a gas outlet above the packer; a submersible pump assembly, which comprises a pump and an electric motor, the pump assembly being lowered into the conduit and landing above the gas separator, the pump having an inlet and an outlet; a pump seal located around the circumference of the pump between the pump inlet and the pump outlet, which seals the pump to the conduit; and a flow control valve located in the conduit below the pump assembly that allows the well fluid from below the packer to flow toward the pump, while preventing downward flow. 9. The well of claim 8, further comprising a circulation valve located in the conduit above the flow control valve, the circulation valve having a port that allows flow of a circulation fluid between the conduit and an annulus surrounding the conduit while in its circulation position, to enable circulation through the annulus. 10. A well, comprising: a string of casing extending into a well; a packer sealingly engaging the casing; a conduit extending into the well, the conduit having a lower portion sealingly engaging the packer, the conduit having an opening in its lower portion for receiving well fluid from below the packer; a gas separator located in the conduit for separating gas from the well fluid, the separator having a gas outlet above the packer; a submersible pump assembly, which comprises a pump and an electric motor, the pump assembly being lowered into the conduit and landing above the gas separator, the pump having an inlet and an outlet; a pump seal located around the circumference of the pump between the pump inlet and the pump outlet, which seals the pump to the conduit; and a safety valve which is selectively operated with hydraulic pressure and located in the conduit for preventing flow of well fluid toward the pump. 11. A well, comprising: a string of casing extending into a well; a packer sealingly engaging the casing; a conduit extending into the well, the conduit having a lower portion sealingly engaging the packer, the conduit having an opening in its lower portion for receiving well fluid from below the packer; a gas separator located in the conduit for separating gas from the well fluid, the separator having a gas outlet above the packer; a submersible pump assembly, which comprises a pump and an electric motor, the pump assembly being lowered into the conduit and landing above the gas separator, the pump having an inlet and an outlet; a pump seal located around the circumference of the pump between the pump inlet and the pump outlet, which seals the pump to the conduit; and wherein the pump is located above the motor; the pump seal defines a chamber located in the conduit below the pump seal and above the gas separator; and further providing that the chamber has a vent located in the pump seal for bleeding off remaining gas collected in the chamber, the vent fluidly connecting the chamber to the inside of the conduit above the pump seal. 12. A well, comprising: a string of casing extending into a well; a packer sealingly engaging the casing; a conduit extending into the well, the conduit having a lower portion sealingly engaging the packer, the conduit having an opening in its lower portion for receiving well fluid from below the packer; a gas separator located in the conduit for separating gas from the well f luid, the separator having a gas outlet above the packer; a submersible pump assembly, which comprises a pump and an electric motor, the pump assembly being lowered into the conduit and landing above the gas separator, the pump having an inlet and an outlet; a pump seal located around the circumference of the pump between the pump inlet and the pump outlet, which seals the pump to the conduit; wherein: the pump is located above the motor; the pump seal defines a chamber located in the conduit below the pump seal and above the gas separator; and further providing that: the pump is suspended in the conduit by a string of tubing; and the chamber has a vent located in the pump seal for bleeding off remaining gas collected in the chamber, so that the chamber is in fluid communication with the inside of the tubing. 13. A well, comprising: a string of casing extending into a well; a packer sealingly engaging the casing; a conduit extending into the well, the conduit having a lower portion sealingly engaging the packer, the conduit having an opening in its lower portion for receiving well fluid from below the packer, an area surrounding the conduit and inside of the string of casing defining an annulus; a gas separator located in the conduit for separating gas from the well fluid, the separator having a gas outlet above the packer; a submersible pump assembly which comprises a pump and an electric motor, the pump assembly being lowered into the conduit and landing above the gas separator, the pump having an inlet and an outlet; and a flow control valve located in the conduit below the pump assembly that allows the well fluid from below the packer to flow toward the pump, while preventing downward flow; and a circulation valve located in the conduit above the flow control valve, the circulation valve having a part that allows flow of a circulation fluid between the conduit and the annulus while in its circulation position, to enable circulation through the annulus. 14. The well of claim 13, wherein the lower portion of the conduit has a lesser diameter than an upper portion, the gas separator being located in the lower portion and the pump assembly being located in the upper portion. 15. A well, comprising: a string of casing extending into a well; a packer sealingly engaging the casing; a conduit extending into the well, the conduit having a lower portion sealingly engaging the packer, the conduit having an opening in its lower portion for receiving well fluid from below the packer, an area surrounding the conduit and inside of the string of casing defining an annulus; a gas separator located in the conduit for separating gas from the well fluid, the separator having a gas outlet above the packer that leads to the annulus; a pump having an inlet and an outlet, the pump being suspended by tubing and lowered into the conduit above the gas separator; and a pump seal located around the circumference of the pump between the pump inlet and outlet, which seals the pump to the conduit, the pump seal defining a chamber inside the conduit between the gas separator and the pump seal, the chamber having a vent that allows gas remaining in the well fluid after separation to exit the chamber. 16. The well of claim 15, wherein the vent allowing gas to exit the chamber comprises a passageway in the conduit with one end opening into the chamber, and another end opening into the annulus. 17. The well of claim 15, wherein the vent allowing gas to exit the chamber comprises a passageway running through the pump seal from a lower surface of the pump seal to an upper surface of the pump seal. 18. The well of claim 15, wherein the vent comprises a passageway through the pump seal and a collection tube leading from the passageway to the tubing. 19. The well of claim 15, wherein the lower portion of the conduit has a lesser diameter than an upper portion, the gas separator being located in the lower portion and the pump asse