Pegasus West Development Environmental Statement
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Pegasus West Development Environmental Statement [This page is intentionally left blank] [This page is intentionally left blank] Pegasus West Development ES Standard Information Sheet INFORMATION SHEET Project Name: Pegasus West Development Development Location: Blocks 43/13b, 43/14, 43/15, 44/11 and 44/12 Licence No.: P1724, P1727 and P2128 Project Reference No.: D/4227/2018 Type of Project: Tie-back Development Undertaker: Spirit Energy Resources Limited Spirit Energy Resources Limited 55% Licencees/Owners: Third Energy Offshore Limited 45% The Pegasus field will be developed via tie-back of the Pegasus West well 43/13b-7 to the existing Neptune Energy-operated Cygnus gas development. The proposed development comprises: The completion for production of the Pegasus West 43/13b-7 well; The installation of an uninsulated 10” nominal bore carbon steel production pipeline, and a 180 mm outer diameter (OD) electro-hydraulic-chemical umbilical, Short Description: each approximately 56.8 km in length, to the existing Cygnus development; The installation of subsea production infrastructure including a Xmas tree and wellhead protection structure (WPS) at Pegasus West and a subsea isolation valve (SSIV) at Cygnus; Modifications to the Cygnus topside facilities; and Processing of Pegasus West hydrocarbons at Cygnus with onward export to Bacton gas terminal. Cygnus topside modifications Q2 2020 – Q4 2021 Well re-entry and completion Q2 2021 Key Dates: Subsea infrastructure installation Q3 2021 Offshore testing and commissioning Q3-Q4 2021 First Gas Q4 2021 – Q4 2023 The significance of the impacts of all planned activities, following the application of control and mitigation measures, was considered low, with the exception of those associated with the permanent physical presence of installed seabed infrastructure and seabed disturbance, the impacts of which are considered medium and ‘as low as reasonably practicable’. Significant Environmental The significance of the risk associated with an unplanned (accidental) large Impacts Identified: hydrocarbon release, again following control and mitigation, is considered medium and ‘as low as reasonably practicable’. Generally, the impacts identified are considered localised and short term with low potential for long term or transboundary and cumulative impacts. The proposed Pegasus West Development does not contradict any marine planning objectives or marine planning oil and gas policies. Statement Prepared By: Genesis Oil and Gas Consultants Ltd. and Spirit Energy Company: Job Title Relevant Qualifications/Experience Spirit Energy Production Senior Environmental Advisor 25 years in industry UK Limited Genesis Oil and Gas 16 years’ of experience in Consultant Environmental Engineer Consultants Ltd environmental/oil and gas Pegasus West Development ES i [This page is intentionally left blank] Pegasus West Development ES ii Table of Contents TABLE OF CONTENTS INFORMATION SHEET………………………………………………………………………………………………..i TABLE OF CONTENTS………………………………………………………………………………………………iii NON-TECHNICAL SUMMARY……………………………………………………………………………………...vii ACRONYMS AND ABBREVIATIONS ....................................................................................................... .xvii GLOSSARY .................................................................................................................................................. xxi 1. INTRODUCTION ............................................................................................................................. 1-1 1.1 Overview of the Pegasus West Development ................................................................................. 1-2 1.2 Purpose of the Environmental Statement ........................................................................................ 1-2 1.3 Scope of the Environmental Statement ........................................................................................... 1-2 1.4 Document Layout ............................................................................................................................. 1-4 1.5 Regulatory Context .......................................................................................................................... 1-5 1.6 Spirit Energy Management System ................................................................................................. 1-9 1.7 Areas of Uncertainty ...................................................................................................................... 1-10 1.8 Consultation Process ..................................................................................................................... 1-10 2. PROJECT DESCRIPTION .............................................................................................................. 2-1 2.1 Nature of the Reservoir.................................................................................................................... 2-1 2.2 Option Selection .............................................................................................................................. 2-2 2.3 Schedule of Activities ....................................................................................................................... 2-4 2.4 Well Completion ............................................................................................................................... 2-5 2.5 Subsea Infrastructure Installation .................................................................................................... 2-7 2.6 Cygnus Overview and Topside Modifications................................................................................ 2-11 2.7 Production Phase .......................................................................................................................... 2-13 2.8 Key Permits and Consents ............................................................................................................ 2-17 2.9 Decommissioning .......................................................................................................................... 2-19 2.10 Summary of Principal Planned Activities and Aspects .................................................................. 2-19 3. ENVIRONMENTAL BASELINE ...................................................................................................... 3-1 3.1 Introduction ...................................................................................................................................... 3-1 3.2 Physical Environment ...................................................................................................................... 3-2 3.3 Marine Flora and Fauna ................................................................................................................ 3-17 3.4 Habitats and Species of Conservation Concern ............................................................................ 3-38 3.5 Socio-Economic Baseline .............................................................................................................. 3-43 4. ENVIRONMENTAL IMPACT ASSESSMENT METHOD ................................................................ 4-1 4.1 Overview .......................................................................................................................................... 4-1 4.2 Definitions ........................................................................................................................................ 4-1 4.3 Significance of Planned Activity Impacts ......................................................................................... 4-1 4.4 Risk of Impacts from Unplanned Events ......................................................................................... 4-3 Pegasus West Development ES iii Table of Contents 4.5 Assessing Project Impacts and Risks .............................................................................................. 4-5 5. PHYSICAL PRESENCE .................................................................................................................. 5-1 5.1 Sources ............................................................................................................................................ 5-1 5.2 Impacts and Receptors .................................................................................................................... 5-1 5.3 Control and Mitigation Measures ..................................................................................................... 5-5 5.4 Conclusion ....................................................................................................................................... 5-6 6. ENERGY USE AND ATMOSPHERIC EMISSIONS ....................................................................... 6-1 6.1 Sources ............................................................................................................................................ 6-1 6.2 Impacts and Receptors .................................................................................................................... 6-2 6.3 Control and Mitigation Measures ..................................................................................................... 6-3 6.4 Conclusion ....................................................................................................................................... 6-4 7. UNDERWATER SOUND ................................................................................................................