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PRODUCTION ANALYSIS AND FORECAST Dr Mai Cao Lan, HCMUT August, 2017 Outline  An Overview of Petroleum Production System (PPS) and the Nodal Analysis Method for PPS  Analysis of Reservoir Performance  Analysis of Wellbore Performance  Analysis of Choke & Flowline Performance  Analysis of Petroleum Production System 8/21/2017 Dr Mai Cao Lân, Faculty of Geology & Petroleum Engineering, HCMUT, Vietnam Text Books  Michael J Economides et al (1994) Petroleum Production Systems Petroleum Engineering Series Prentice Hall  H Beggs (2003) Production Optimization using Nodal Analysis OCGI & Petroskills Publications  Mukherjee & Brill (1999) Multiphase Flow in Wells Society of Petroleum Engineers 8/21/2017 Dr Mai Cao Lân, Faculty of Geology & Petroleum Engineering, HCMUT, Vietnam OVERVIEW OF PETROLEUM PRODUCTION SYSTEM & NODAL ANALYSIS METHOD 8/21/2017 Dr Mai Cao Lân, Faculty of Geology & Petroleum Engineering, HCMUT, Vietnam Petroleum Production System Gas Sales Flowing Wellhead Pressure Horizontal Flowline Separator Stock Tank Vertical or Inclined Tubing Intake 8/21/2017 Flow Through Porus Media P, K, IPR Dr Mai Cao Lân, Faculty of Geology & Petroleum Engineering, HCMUT, Vietnam System Analysis for Petroleum Production Systems • Analyze the performance of the system taking into account ALL of its components • Figure out potential problems associated with the production system • Analyze the behavior of the system in response to any changes of a component 8/21/2017 Dr Mai Cao Lân, Faculty of Geology & Petroleum Engineering, HCMUT, Vietnam NODAL Analysis (NA) Method • NODAL Analysis belongs to System Analysis Methods applied in Petro Eng • The method allows production engineers to analyze the performance of a petroleum production system • The method help production engineers to select optimal system parameters 8/21/2017 Dr Mai Cao Lân, Faculty of Geology & Petroleum Engineering, HCMUT, Vietnam Fundamentals of the NA Method • Always consider a component in the relationships with the others • Pressure and Pressure Losses across different components of the system are of primary interests • The performance of a system can be analyzed via one or more NODEs 8/21/2017 Dr Mai Cao Lân, Faculty of Geology & Petroleum Engineering, HCMUT, Vietnam Possible Pressure Losses Gas Sales P8 Pwh P6 Psep P5 PDSV Separator Stock Tank P4 PUSV P1 = (Pr - Pwfs) P2 = (Pwfs - Pwf) P3 = (P UR - P DR) P4 = (P USV - P DSV) P5 = (Pwh - P DSC) P6 = (P DSC - Psep) P7 = (Pwf - Pwh) P8 = (Pwh - Psep) P7 PDR P3 = Loss in Porus Medium = Loss across Completion = Loss across Restriction = Loss across Safety Valve = Loss across Surface Choke = Loss in Flowline = Total Loss in Tubing = Total Loss in Flowline PUR Pwf P2 Pwfs Pr P1 8/21/2017 Dr Mai Cao Lân, Faculty of Geology & Petroleum Engineering, HCMUT, Vietnam Locations of Various Nodes 1A 1B 8/21/2017 Node Location 1A 1B Separator Surface Choke Wellhead Safety Valve Restriction Pwf Pwfs Pr Gas Sales Stock Tank Remarks Functional Functional Functional Dr Mai Cao Lân, Faculty of Geology & Petroleum Engineering, HCMUT, Vietnam 10