PTTEP Operations Overview

Project information 1/5 2021 Key Activities 12 • Ensure gas deliverability level at DCQ*** • Drill development wells • Prepare for decommissioning activities Project Status* Phase PTTEP'S Share Partners (as of April 2021) 6M2021 Average Sales Volume ** Gas (MMSCFD) Liquid (KBPD) Thailand and JDA 1 Arthit OP Production 80% Chevron MOECO 16% 243 4% 2 B6/27 OP Production 100% Chevron 51.66% MOECO 16.71% 3 B8/32 & 9A JV Production 25.001% 48 15 KrisEnergy 4.63% Palang Sophon 2% 4 Bongkot OP Production 66.6667% TOTAL 33.3333% 919 22 • K • Ensure deliverability of production volumes as nominated from the buyer • Drill development wells • Drill development wells • Maintain production level as planned Carry out wells plug and abandonment, and prepare for non-transferred wellhead platforms decommissioning Prepare for decommissioning activities • Ensure gas deliverability level at DCQ*** • Drill development wells Topside reuse • Ensure gas deliverability level at DCQ*** • Deliver production volumes as nominated from the buyer and oil production as planned Prepare for decommissioning activities • Maintain production plateau Explore for additional field potential i.e. new drilling well and EOR/IOR • Prepare for decommissioning activities • Maintain production plateau Contract 3 (Formerly JV Chevron 5 Production 5% Unocal III) MOECO 71.25% 23.75% 501 27 27 • Contract 4 (Formerly JV 6 Production 60% Pailin) Chevron MOECO 35% 395 16 5% • 7 E5 JV Production 20% ExxonMobil Chevron 80% 8 51% JV 8 G4/43 Production 21.375% MOECO 21.25% 1 3 JV 9 G4/48 Production 5% Palang Sophon Chevron MOECO 6.375% 71.25% 2 0.2 23.75% 10 L53/43 & L54/43 OP Production 100% 11 PTTEP1 OP Production 100% 12 S1 OP Production 100% 13 Sinphuhorm OP Production 55% Apico**** ExxonMobil ** Status: OP = PTTEP operatorship / JOC = PTTEP joint operatorship / JV = PTTEP as Joint Venture Partner Sales volume stated at 100% basis. *** DCQ Daily Contractual Quantity **** PTTEP holds indirectly and directly 80.48% participating interest in Sinphuhorm Project. APICO also holds 100% participating interest in Block L15/43 and Block L27/43. 1 • 0.2 • . Explore for additional field potential i.e. new drilling well and EOR/IOR Prepare for decommissioning activities 8 Crude:28 KBPD LPG: 190 MTon/Day 35% 10% 97 0.3 • Maximize crude production by fully implemented the business plan and work activities as planned • 10 years strategy roadmap is being submitted to the management committee to ensure all focused strategic areas will be set up in the long term until end of concession in year 2031 • Ensure gas deliverability ⚫ Drill development well Sinphuhorm new Gas Sales Agreement is under Government's consideration and approval process 37

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