ENVIRONMENTAL STATEMENT BARDOLINO DEVELOPMENT

Bardolino Development Environmental Statement
Table 3.1: Overview of the Bardolino Development concept selection
Concept Concept Description Technical Evaluation Environmental Evaluation
1. Remote subsea
development with 3.5 km
tie-back to Howe Drill
Centre.
Note -Since the initial
development option
study, the proposed well
location was moved to a
position 2 km from the
Howe PTS. This was to
ensure that the field are
did not extend into the
adjacent Howe block and
to avoid the need for a
subsea pipeline crossing
over the Langeled
pipeline.
2. Subsea development
with deviated well drilled
from Howe Drill Centre.
• Single well drilled from mobile drilling
unit (92 days)
• Production manifold and pipeline
installation from Bardolino well to
Howe
• Production route through Howe to
existing Nelson Platform
• Modifications to Nelson
• Single well drilled from mobile drilling
unit (110 days), longer top hole
section and more cuttings
• No new pipeline installation, or
production manifold installation
• Production route through Howe to
existing Nelson Platform
• Modifications to Nelson
• Tried and tested methodology
• A combination of longer reach
drilling with high temperature
reservoir would give higher
risks during the execution
phase. The project risk would
be less attractive to Shell with
this concept.
• Key Strengths: Shorter drilling time therefore lower
emissions to air and sea. Shorter well bore therefore
lower volumes of generated cuttings and chemical use
and discharge.
• Key weaknesses: Pipeline installation required with
associated vessel use, increased seabed footprint and
chemical use and discharge.
• Key Strengths: No pipeline installation required,
smaller amount of seabed disturbance.
• Key Weaknesses: Longer drilling time, more emissions
to air and sea. Longer top hole section generating
greater volume of cuttings and requiring more use and
discharge of chemicals.
April 2008 Page 3-3