Guidelines for the conduct of offshore drilling hazard ...

1 Guidelines for the conduct of offshore drilling hazard site surveysRepor t No. 373-18 -1 April 2011 international association of Oil & Gas ProducersPublicationsGlobal experienceThe international association of Oil & Gas Producers has access to a wealth of technical knowledge and experience with its members operating around the world in many different terrains. We collate and distil this valuable knowledge for the industry to use as Guidelines for good practice by individual high quality database and guidelinesOur overall aim is to ensure a consistent approach to training, management and best practice throughout the oil and gas exploration and production industry recognises the need to develop con-sistent databases and records in certain fields.

2 The OGP s members are encouraged to use the Guidelines as a starting point for their operations or to supplement their own policies and regulations which may apply recognised source of industry informationMany of our Guidelines have been recognised and used by international authorities and safety and environmental bodies. Requests come from governments and non-government organisations around the world as well as from non-member every effort has been made to ensure the accuracy of the information contained in this publi-cation, neither the OGP nor any of its members past present or future warrants its accuracy or will, regardless of its or their negligence, assume liability for any foreseeable or unforeseeable use made thereof, which liability is hereby excluded.

3 Consequently, such use is at the recipient s own risk on the basis that any use by the recipient constitutes agreement to the terms of this disclaimer. The recipient is obliged to inform any subsequent recipient of such document may provide guidance supplemental to the requirements of local legislation. Nothing herein, however, is intended to replace, amend, supersede or otherwise depart from such requirements. In the event of any conflict or contradiction between the provisions of this document and local legisla-tion, applicable laws shall noticeThe contents of these pages are The international association of Oil and Gas Producers.

4 Permission is given to reproduce this report in whole or in part provided (i) that the copyright of OGP and (ii) the source are acknowledged. All other rights are reserved. Any other use requires the prior written permis-sion of the Terms and Conditions shall be governed by and construed in accordance with the laws of Eng-land and Wales. Disputes arising here from shall be exclusively subject to the jurisdiction of the courts of England and note 18 1 Guidelines for the conduct of offshore drilling hazard site surveysRevision historyVersionDateAmendments1A p r i l 2 011 Initial publicationAcknowledgementsThis guidline was produced by The international association for Oil & Gas Producers Geomatics Committee4 international association of Oil & Gas Producers OGPT able of contents1 Introduction 12 Objectives of site surveys General.

5 Physical Environment .. Planning fundamentals.. Scope .. Operations type .. 43 site survey process Desk study and project planning .. Data acquisition .. Data processing, interpretation and integration .. Reporting .. 54 Desk studies and project planning Use of existing geoscience data .. Pre-existing and proposed operations .. Wrecks, submarine cables, sites of special interest .. 65 Data requirements General.. Area of study .. Total Depth of Study .. Use of a pre-existing site survey .

6 Acquisition of a new site survey .. Use of exploration 3D seismic data on a standalone basis .. Enhancing the value of an exploration 3D seismic dataset .. Use of exploration 3D seismic data in a development scenario .. 176 Geohazards analysis and reporting Purpose of the report .. Scope of reporting .. Identifying sources of risk .. Consideration by rig type .. Deliverables .. 20 Glossary 21 Appendix 1 hazard impact tables 27 TablesTable 1: conditions to be addressed by a marine site survey .

7 2 Table 2: pre-existing data validity guidance .. 9 Table 3: Main line spacing guidance.. 14 FiguresFigure 1 .. 3 Figure 2 .. 71 Guidelines for the conduct of offshore drilling hazard site surveys OGP1 IntroductionThis document provides guidance for the conduct of offshore drilling hazard site surveys (hereafter referred to as site Surveys). The Guidelines address the conduct of geophysical and hydrographic site surveys of proposed offshore well locations and the use of exploration 3D seismic data to enhance, or to replace, acquisition of a site document does not set out to provide guidance on geotechnical engineering requirements for design of anchoring systems, the analysis of jack-up rig foundation or platform foundation design, neither does it address detailed guidance on environmental survey requirements.

8 Such works require expert guidance and involvement of geotechnical or structural engineers or environmental scientists who are conversant in the application of appropriate industry codes for these document replaces the former UKOOA Guidelines for conduct of mobile drilling rig site surveys, version , and Guidelines for conduct of mobile drilling rig site investigations in deep-water, version 1, previously published under the auspices of the former UK offshore Operators association (UKOOA), now Oil & Gas Guidelines describe oilfield good practice in this subject area in support of meeting country specific regulatory requirements.

9 While the document sets out oilfield good practice, it is impossible for the document to address all the varying regulatory requirements that are in place in different countries around the should make themselves aware of the local regulatory requirements that apply to marine site surveys. It is recommended that operators compare local requirements to these Guidelines and where there are differences apply the higher of the two sets of document explains the requirements that different types of offshore drilling units have on a site survey . The document also emphasises the differing site survey requirements of shelf and deep-water techniques described in this document can also be applied to other types of seabed surveys, such as pipeline or cable route surveys, etc.

10 While this document does not set out to directly address planning and delivery of such projects, it will be recognised that the same general thought processes and practices will be applicable to such companion OGP document Guideline for the conduct of drilling hazard site surveys techni-cal notes (hereafter The Technical Notes ), Report No 373-18-2, will be published in 2011 and will provide supporting technical information and background theory on the various phases of a site survey project outlined in this association of Oil & Gas Producers OGP2 Objectives of site GeneralSite surveys are performed to minimise the risk of harm to personnel and equipment, and to protect the natural environment.