1. WOC2: Underground Storage (UGS) IGU: 2006 – 2009 TWP Preparation Study Group Topic Strat. Guid. Possible interaction with: SG 2.1UGS Database2 SG 2.2UGS technology improvements2 SG 2.3Intelligent UGS (iUGS)2

2. STUDY TOPICS DESCRIPTION SG 2.1.: UGS Database  Continuity in database development  Enlarging database, eg: »eruption events »emergency events »remediation »split between oil and gas fields »incorporation of pipeline systems related to UGS »national trends of UGS industry

3. SG 2.2.: UGS Technology Improvements  Horizontal drilling and long-term stability of wells  Formation Damage mechanisms and the most serious problems in the various regions of the world, the remediation practices  Well Bore Integrity -what tools are used for determination. New Technologies in downhole logging, mechanical integrity testing  Cement bonding and how it relates specifically to gas storage wells. Cement deterioration and determination  Investment savings – alternative cushion gases etc.

4. SG 2.3.: Intelligent UGS  Automation in dataflow from Scada to reservoir engineering and continuos analyses and process evaluation  ICT, reservoir management and technology  Data mining and artificial intelligence  Coupled simulation, technology/reservoir  Optimization, monitoring, operation safety  Cost savings

5. Topic Summary IGU: 2006 – 2009 TWP Preparation Group Study Group 1 Study Group 2 Study Group 3 WOC1Conventional resourcesUnconventional resources WOC2UGS databaseUGS technology improvements Intelligent UGS WOC3Regulation & safetyNew technologiesContribution to SD WOC4Asset managementLeakage reduction3rd party damage WOC5IndustrialDomestic & commercialTransport (NGV) Gas utilisation efficiency indicators PGCAGuidelines of SDGHG reduction case studies PGCBSupply & demand Price formation and trends Natural gas industry outlook to 2030 Regulation & future industry structure PGCCSW AsiaSouth AmericaEastern Europe PGCDLNG Quality & inter- changeability LNG contracting flexibilityRemote & offshore LNG facilities TF R&DRole and structure of R&D within the gas industry /IGRC TF GMI * Best practices summary from relevant committees to be analysed

6. Action Plan / TWP Milestones IGU: 2006 – 2009 TWP Preparation DateActionResponsible 22/3/061 page (max.) on terms of reference of selected Study Groups (purpose + scope) WOC/PGC/TF Chairs 31/3/06Consistency check and fine-tuningCC Chair 15/4/06Adjustment of Strategic Guidelines (as from committee feed-backs) CC Chair 30/4/06First draft of TWP*CC Chair 15/5/06Submission of individual presentations for WGC2006, Amsterdam WOC/PGC/TF Chairs 30/5/06Final preparation of full presentation of TWP for WGC2006 All CC * Will be attached to Secretariat’s formal request to Charter/Associate members for WOC/PGC participants