Method and apparatus for production of subsea hydrocarbons using a floating vessel

• US 4,556,340 A
• Filed: 08/15/1983
• Issued: 12/03/1985
• Est. Priority Date: 08/15/1983
• Status: Expired due to Fees

• Current Assignee: Conoco Incorporated (ConocoPhillips)
• Original Assignee: Conoco Incorporated (ConocoPhillips)
• Inventors: Morton, Arthur W.
• Primary Examiner(s): Taylor, Dennis L.
• Application Number:
  US06/523,315
• Time in Patent Office: 841 Days
• Field of Search: 405/195, 405/203-208, 405/224, 405/225, 405/226, 166/350, 166/359, 166/367, 285/114
• US Class Current: 405/224.2
• CPC Class Codes: E21B 17/015 Non-vertical risers, e.g. articulated or catenary-type
• CPC Class Codes: E21B 33/076 specially adapted for underwater installations

Abstract

Production from a subsea wellhead to a floating production facility may be realized with the use of a substantially neutrally buoyant flexible production riser which includes biasing means for shaping the riser in an oriented broad arc. The broad arc configuration permits the use of wireline well service tools through the riser system.

Claims

1. In a system for the production of hydrocarbon fluids from a subsea well including at least one well head having a riser connection, a moored, floating production vessel located at the surface of the body of water, and at least one flexible production riser extending between said well head riser connection and said vessel, said flexible riser being substantially neutrally buoyant and further including biasing means on said riser for shaping said riser in an oriented, broad arc, said biasing means including a control bundle disposed on one side of said riser bundle, whereby the passage of gravity-motivated wireline well service tools between said vessel and said well is permitted.

2. The improvement as set forth in claim 1 including a plurality of said risers, said risers disposed in an array so that said oriented, broad arc of each riser is oriented radially outwardly of a vertical line extending from said sea flood to said floating vessel, said plurality of risers forming a "Chinese lantern" shape.