Well Drilling Engineering Overview of Rotary Drilling Dr DO QUANG KHANH Contents       Introduction Drilling Team Steps to Drill a Well Drilling Rigs Offshore Drilling Drilling Cost Analysis (Drilling Economics) Introduction: The life of an oil or gas field can be sub-divided into the following phases: • Exploration • Appraisal • Development • Maintenance • Abandonment Fig: Role of drilling in field development Personnel involved in drilling a well Fig 1.3 - Typical drilling rig organization Fig 1.4 The rotary drilling process Steps to Drill A Gas/Oil Well Complete or obtain seismic, log, scouting information or other data Lease the land or obtain concession Calculate reserves or estimate from best data available If reserve estimates show payout, proceed with well Obtain permits from conservation/ national authority Steps to Drill a Well - cont’d Prepare drilling and completion program Ask for bids on footage, day work, or combination from selected drilling contractors based on drilling program If necessary, modify program to fit selected contractor equipment Steps to Drill a Well - cont’d Construct road, location/platforms and other marine equipment necessary for access to site 10 Gather all personnel concerned for meeting prior to commencing drilling (pre-spud meeting) 11 If necessary, further modify program 12 Drill well Steps to Drill a Well - cont’d 13 Move off contractor if workover unit is to complete the well 14 Complete well 15 Install surface facilities 16 Analysis of operations with concerned personnel Drilling Operations Field Engineers, Drilling Foremen A B C D Well planning prior to SPUD Monitor drilling operations After drilling, review drilling results and recommend future improvements - prepare report General duties What are the well requirements? Objectives, safety, cost Making a Connection Making a Trip Making a mouse hole connection Moving Kelly to Single in Mousehole Stabbing the Pipe Single Added Ready to Drill Making a mouse hole connection - cont’d Making a trip Put Kelly in Rathole Why trip? Use Elevators for tripping Tripping one stand at a time 60-90 ft Making a trip - cont’d Fig 1.5 Classification of rotary drilling rigs Noble Drilling’s Cecil Forbes A Jack-Up Rig Sonat’s George Washington A SemiSubmersible Rig Zapata’s Trader A Drillship Deep Water Development Options SUBSEA COMPLET IONS FIXED PLATFO RMS COMPLI ANT TOWER S FLOATIN G PRODUC TION TENSIO N LEG PLATFO RMS