Riser with retrievable internal services
First Claim
1. A system for raising production fluid from a source on the seabed, comprising:
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a riser having an internal passageway for conveying said production fluid and having a first, lower, end for connection to or a top end support for supporting the riser at its second end at or in the vicinity of the sea surface; and
an operating device mounted inside the riser for displacement within the riser between a first, operating, position in the riser remote from its second end, and a second, access, position, at the second end of the riser, so that the device is accessible for replacement or repair, the operating device being a pump or a gas injector.
1 Assignment
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Accused Products
Abstract
Systems are described for raising production fluid from a source (1) on the seabed comprising a riser (4) having a first, lower, end for connection or connected to the source; a top end support for supporting the riser at or in the vicinity of the sea surface; and an operating device (11) mounted inside the riser (4) for displacement within the riser so that the pump is accessible to an operator for replacement or repair. The operating device (11) may be displaced on a pipe (12) which extends within the riser (4) and to a lower end of which the device (11) is attached. The device (11) may be inter alia an electric pump, a hydraulic pump, a gas injector, a heater or a cleaning device.
79 Citations
43 Claims
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1. A system for raising production fluid from a source on the seabed, comprising:
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a riser having an internal passageway for conveying said production fluid and having a first, lower, end for connection to or a top end support for supporting the riser at its second end at or in the vicinity of the sea surface; and
an operating device mounted inside the riser for displacement within the riser between a first, operating, position in the riser remote from its second end, and a second, access, position, at the second end of the riser, so that the device is accessible for replacement or repair, the operating device being a pump or a gas injector. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
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36. A method of installing an operating device in a riser connecting a source of production fluid on the seabed to a top end support supporting the riser at or in the vicinity of the sea surface, the operating device being a pump or a gas injector, the method comprising:
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(a) introducing the device into the riser at the upper end thereof; and
(b) driving the device downwardly into the riser to a desired operating position in the riser remote from its end at the top end support. - View Dependent Claims (37, 38, 39, 40, 41, 42, 43)
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Specification