the hydrographic society in scotland · the hydrographic society in scotland pipe lay operations...

The Hydrographic Society In Scotland

Sophie Salway

Geo Information Analyst

Shell Geomatics, Europe

Development Projects

Goldeneye Case Study


GOLDENEYE

ST. FERGUS

• Gas Condensate Field

• Located in Outer Moray Firth, 100km NE of St Fergus Gas Terminals

• Low safety risks due to normally unmanned operations offshore

• Total lifetime production expected to be in excess of 500 Billion scf Gas and 17 Million barrels Condensate over a 10 Year period

• Greatest water depth (120 metres) in which a Jack-Up rig will be used for production well drilling

Goldeneye Case Study


Project Timeline

Activity / Year 1 2 3 4 5 6 7 8 9 10 11

Exploration Seismic Acquisition

Interpretation

Exploration Drilling

Appraisal

Final Investment Decision

Concept Select

Route Survey + Site Investigation

Front End +Detailed Design

Offshore Construction

Development Drilling

Production Start Up


• Geology and reservoir characteristics

• Restrictions (Legal, Environmental, Physical)

• Proximity to infrastructure

• Location of markets

• Technology

• Prevailing MetoceanConditions

Concept Select


Construction Operations

• Pipe Lay – Shore Pull – Near shore / Offshore Operations

• Trenching

• Backfilling

• Platform Installation

• Tie-In and Pre-Commissioning Works

• Rock dumping – Crossings and Pipeline Protection

• Drilling Phase


Pre Installation Survey

• Ensures route / site is free of obstructions

• Side Scan Sonar and MBES

• ROV centre line / site visual survey

• Digital Terrain Model

• Route Topography Analysis

• Array visibility Analysis


Pipe Lay Operations Support

• Semi submersible pipe lay barge

• Deep and shallow water capability

• Dedicated pipe lay ramp

• Dual lay and piggyback lay

• Large diameter pipe lay capability

• Lay rate up to 7km/day

• Semi automatic welding system

• Self propelled vessel

• 12 point mooring system


Survey Support for Construction Operations

• Pre-Award Survey Input

• Pre-Construction Survey Activities

• Landfall Preparation and Plant Construction

• Pipe lay Barge Navigation

• Tug Management

• Shore Pull

• Pipeline crossing

• Pipe lay down

• Trenching and Backfill for service line

• Heavy lift vessel positioning

• Acoustic positioning USBL or LBL of structures

• EDM (Total Station) positioning of structures


Shore Pipeline Pull


Pipeline Routing


Trenching and Backfill


Platform Installation


Pipeline Tie Ins and Rock dump Operations


As Built Records


Decommissioning• Infrastructure Assessments

• Debris Surveys

• Identify dropped objects

• Pipeline depth of cover

• Well positions for P&A

• Rig move planning for P&A

• Environmental surveys


Summary

• Pipe Lay – Shore Pull – Near shore / Offshore Operations

• Trenching

• Backfilling

• Platform Installation

• Tie-In and Pre-Commissioning Works

• Rock dumping - Crossings and Pipeline Protection

• Drilling Phase

• Decommissioning


Questions?

the hydrographic society in scotland · the hydrographic society in scotland pipe lay operations...

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