Wells – Submerged well – Riser
Patent
1982-08-24
1984-06-26
Purser, Ernest R.
Wells
Submerged well
Riser
405195, 175 7, 166355, 166368, E21B 1701
Patent
active
044560737
ABSTRACT:
A flexible connection apparatus is disclosed for accommodating relative movement between a compliant offshore structure and the sea floor. The compliant offshore structure supports a fluid-carrying system which conveys fluids between the sea floor and the structure. The fluid-carrying system includes a riser and a helical flowline. The lower end of the riser is connected to the sea floor. The first end of the helical flowline is connected to the upper end of the riser and the second end of the helical flowline is connected to the structure. As the compliant offshore structure is displaced from its vertical equilibrium position due to loading forces induced by wind, waves, and ocean currents, the helical flowline elastically flexes through torsional deflection to accommodate such movement. In a preferred embodiment of the apparatus, a wellhead is connected between the riser and the helical flowline such that the centerline of the helical flowline is substantially vertical. In yet another embodiment of the apparatus, a bending flowline is connected between a wellhead and the structure with its centerline being substantially horizontal to accommodate movement of the structure through bending deflection rather than by torsional deflection.
REFERENCES:
patent: 3461916 (1969-08-01), Ledgerwood
patent: 3482408 (1969-12-01), Manning
patent: 3913668 (1975-10-01), Todd et al.
patent: 4067202 (1978-01-01), Reed
patent: 4125162 (1978-11-01), Groves et al.
Barth James R.
Fowler Joe R.
Hitchcock Wilbur A.
Miller Jack E.
Atkinson Alan J.
DelSignore Mark J.
Exxon Production Research Co.
Purser Ernest R.
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