Bp Corporation North America Inc.

Bp Exploration Operating Company Limited

Adam L Ballard

Kevin Kennelley

Chau Nguyen

Vicki Deck Corso

Graeme Steele

Paul W Gulgowski, Jr

Roy Shilling

Steve Hatton

Ricky Thethi

Tony Oldfield

Robert W Franklin

Walter Greene

Philip D Maule

David A Wilkinson

Norman Dennis McMullen

David E Wilkinson

George J Shoup

Paul W Gulgowski

A free-standing riser system connects a subsea source to a surface structure. The system includes a concentric free-standing riser comprising inner and outer risers defining an annulus there between. A lower end of the riser is fluidly coupled to the subsea source through a lower riser assembly (LRA) and one or more subsea flexible conduits. An upper end of the riser is connected to a buoyancy assembly and the surface structure through an upper riser assembly (URA) and one or more upper flexible conduits, the riser also mechanically connected to a buoyancy assembly that applies upward tension to the riser. The riser may be insulated for flow assurance, either by a flow assurance fluid in the annulus, insulation of the outside of the outer riser, or both. The system may include a hydrate inhibition system and/or a subsea dispersant system. The surface structure may be dynamically positioned.

Marine subsea free-standing riser systems and methods

A method to remove hydrate plugs in a production system by passing a non-hydrate-forming or a hydrate-forming gas, which forms hydrates at a higher pressure than the existing hydrate, through the flow-restricting hydrate.

Method for remediating flow-restricting hydrate deposits in production systems

Growing community of inventors

Katy, TX, United States of America

Adam L Ballard