ADNOC Petroleum Institute Quantitative Risk Assessment in Petroleum Engineering

1. Overall Flowchart Set Subsea Template 1 Run Upper Completion without Gas Lift Drill Well Install Lower Completion/ Screens Wash and 1.1 Run, Land and Lock Completion String Without GL Scrape Run Run X-mas Tree Pull XMT Bore GLV Pull X-mas Protector and No Installed Yes Fail to pull? Yes Tree and Re- Wash Tree and Pick Up and Run Initially? run BOP BHA and Tbg to DHSV's Case B No Case A Initial Middle Run Upper Check Weather Winter Yes Bad Weather? Yes Wait (Winter) Obtain Rig Completion Completion PU&MU DHSV's DHSV or 1 3 Slot, Perforation, 7 Change to without and Test Control Control Line Yes Gas Lift Re-entry GP and Backup DHSV Installation No Lines Failure? Clean Up No and Prepare Secure Well, Initial Upper No Bad Weather? Yes Wait (Summer) Production 4 Pull Upper 8 Completion 2 POOH and without Gas Completion with Gas Lift Lift Run Tbg below Drop Fish Object. Yes Tubing Hanger Something? Re-run Yes Run, Land & Completion Re-entry Lock Compl. Clean Up No 1.1 Middle String and Prepare Produce Well 5 Compl., Perf, 9 Production without GL No GP and with Gas Installation Lift Sting into Lower Completion Shear PBR, 1.1.1 Re-entry Inflow Test DHSV's POOH, Fix Produce Well Obtain Rig PBR and GLV Upper Yes DHSV's Failure? and Re-run 6 Completion 3 Land TH Slot, Necessary? Completion Re-entry with Gas Lift Yes No Pressure Test Pressure Test Clean Up Insufficient Reestablish String & Set RU WL, Gas Rate? Bad Test? String & Set and Prepare Flow from Yes Run Plug in Production Disconnect 9 Production 10 Gas Zone, Production Inflow Test THRT, Nipple Packer No with Gas CU and Packer LS Failure? Yes Lift Prep. Prod. Landing String Re-run Work Over Riser No POOH and No Completion Bad Test? Yes Yes Recomplete String Leakage Produce Well Produce Well Produce Well Retrieve XMT Well Isolation Sleeve on WL No POOH, Previous Remove Plug and Bad Set New Annulus Test Yes Pressure Test Annulus Yes Overall Production Failed? Annulus Test? Flowchart Packer No No Run Upper Completion 1 without Gas Lift Sensitivity Simulations Sensitivity Simulations Case B Total Cost Probability (-) Case A Sensitivity 0.14 0.12 0.10 Sensitivity Coefficients for Top Ten Risks 0.08 Tornado Diagram Rank Activity Risk Sensitivity Coefficient 0.06 1 8.1.1 (6.1) Control line failure after landing (before locking) TH? G222 0.5559 0.04 2 2 Bad Test of TH plug (w/o GL)? G144 0.4670 3 4 Necessary to M&R PP? G234 0.3262 0.02 4 3 BOP System Failure? G195 0.1953 5 9 Gas Zone Not Producing? G254 0.1945 33.2 29.2 30.9 31.5 33.8 29.8 30.3 32.1 32.6 34.3 34.9 6 6.1 GLV CL Failure after RIH to DHSV? G316 0.1886 0.00 7 2 & 9 Bad Pressure Test of Tree Cap (w/o GL)? G156 & G277 0.1780 8 7.2 (5) Bad Test of Seals after Locating PBR? G68 0.1244 9 3 WOR/STT/SSTT System Failure? G203 0.1179 MNOK 10 5(7.2)&9 Bad Landing String Test G42 & G339 0.1149 0.00 0.10 0.20 0.30 0.40 0.50 0.60 • 100 % probability for re-entry in Case A. • 12 % probability for insufficient gas lift rate in Case B. Well Completion Simulation ADNOC Petroleum Institute Quantitative Risk Assessment in Petroleum Engineering • Vision/Mission: • Internationally recognized and accredited graduate petroleum engineers for reservoir, • well engineering, production and operations • Focused programs for continuing education and training • Industry based (part- and full-time) graduate studies • Focused (client driven) technology development and consulting profile • Areas of Expertise: • Specialist and generalist expertise in • Reservoir, drilling, completions, production • Wide international experience • Screening options for improved drilling & • production • Detailed technical evaluations for improved oil • recovery • Specialized lab facilities • Quantitative risk-based economic assessment Quantitative Risk Assessment Process Process Flowcharts Risk Register Data Gathering QRA Model Spreadsheets • Example cases • Extremely long ERD wells • Complex multilateral and intelligent wells • High temperature, high pressure reservoirs • Water management and injection wells • Field development and re-development options • Infill drilling, sidetracking, slender well design and drilling • WAG processes • Underbalanced Drilling • Water-based fluid/production chemistry • Fluid monitoring, sampling and analysis • Artificial lift Results and Sensitivity Economic Modelling ML Sidetrack Vendor Screening Ultra-long ERD 16” Hole Evaluation - Risk Cost