Products & services / Buoyancy & SURF

Matrix LGS® Riser Buoyancy System

Keep drilling when others stop

Matrix LGS® (Longitudinal Groove System) has been designed to reduce VIV and drag to allow rigs to keep drilling when they would normally have to stop. Based on simulated eddy profiles for the Gulf of Mexico, this can translate into an annual increase of 20% more uptime during eddy current events which equates to hundreds of hours, potentially saving around $15 million in lost time per annum.

Matrix LGS® delivers a significant increase in rig capability at a small capital cost and will give those who adopt this new technology a clear advantage over competitors who don't. Matrix's engineers are ready to carry out detailed riser VIV analysis to estimate just how much your operation would benefit from using Matrix LGS®.

LGS is a registered trademark of AMOG Technologies Pty Ltd


  • Significantly reduces VIV and drag when compared with conventionally floated risers
  • 20%-30% increase in raw operable current speeds (in regions of the world investigated), including crabbing advantages
  • Estimated 20% more uptime during eddy current events
  • VIV fatigue damage rates five to ten times lower
  • Comparable buoyancy and manufacturing costs to conventional modules
  • Easily stacked both vertically and horizontally
  • Inherent anti-roll stability on moving decks
  • Can be used with existing riser handling and storage equipment

Introducing Matrix LGS riser buoyancy systems


Paper (2019): Field trial of vortex-induced vibration suppression technology for drilling riser buoyancy. 

OMAE2019-96426. 9 - 14 June 2019, Glasgow, Scotland.

Editorial (2019): VIV Suppression

UT3 Issue 4 - feature article

Paper (2018): Mitigation of pipeline free span fatigue due to vortex induced vibration using longitudinally grooved suppression. 

OMAE2018-77716. 17 – 22 June 2018, Madrid, Spain.

Paper (2017): LGS technology for Drilling Risers: Reducing Costs by Increasing Operability while Improving Safety. 

Australasian Oil & Gas Exhibition & Conference (AOG). 22 – 24 February 2017, Perth, Australia.

Paper (2017): Drilling riser case studies comparing the drag performance of LGS technology to conventional buoyancy units and fairing. 

OMAE 2017-62219. 25 - 30 June 2017, Trondheim, Norway.

Paper (2016): Drag reduction and VIV suppression behaviour of LGS technology integral to drilling riser buoyancy units. 

OMAE 2016-54689. 19 - 24 June 2016, Busan, South Korea.