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Nodal Analysis (Petroleum Experts IPM Software)

Rajan Chokshi, PhD

INSTRUCTOR: Rajan N. Chokshi, PhD
DISCIPLINE: Engineering
COURSE LENGTH: 5 Days (Classroom) / 10 Half-Day Sessions (Live Online)
CEUS: 4.0
AVAILABILITY: Public, In-House, & Live Online

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WHO SHOULD ATTEND: Production, reservoir, completion, drilling and facilities engineers, analysts, operators, and anyone interested in learning about the application of NODAL analysis on well-design and operational decisions on profitability.

COURSE DESCRIPTION: Dynamics of the oil and gas production wells require that decisions related to oil and gas producing installations be made after a thorough analysis of many inputs and many more production scenarios. NODAL™ analysis, also referred to as the production system analysis, is an important technique that offers a toolset to determine the optimum combination of wellbore and surface system parameters under varying production conditions.

This five-days long course aims to provide an essential discussion of NODAL analysis for naturally flowing oil and gas wells and artificially lifted wells. Using a combination of lectures and classroom exercises, we introduce participants to the theories underlying this vital technique. Once students understand the building blocks, combinatorial scenarios are introduced and solved to help students understand the interaction of various system parameters.

Petroleum Experts IPM software is used to demonstrate effective use of NODAL analysis. Clients need to provide access to Petroleum Experts Prosper and GAP software package(s) and their datasets, and a workshop is conducted to provide hands-on exposure to how NODAL analysis is performed in Petroleum Experts software package and what workflow engineers can use to get maximum benefits. This requires three days of consulting work and a license for the client’s software at least one month prior to the class.

LEARNING OUTCOMES:

  • Learn the fundamentals of oil & gas production, like
    • Black oil characteristics and PVT properties importance,
    • Multi-phase fluid flow behavior and patterns, multi-phase fluid flow correlations and unified mechanistic models,
    • Reservoir behavior or the inflow performance relationship (IPR),
    • Vertical lift performance (VLP), pressure-gradient curves
  • Combine above concepts leading to the NODAL analysis concepts like:
    • Selection of optimum completion.
    • When will a gas or oil well not flow naturally?
  • Apply NODAL analysis for artificial lift scenarios

COURSE CONTENT:

  • Pre-test
  • Production Basics
    • The objectives, and the main challenges to achieve these objectives.
    • Why design in a piece-meal fashion, not the most effective approach?
  • NODAL Analysis or Systems Analysis
    • What is it?
    • What do we need to perform NODAL analysis?
  • Single & Multi-Phase Flow Basics
    • Why Multiphase Flow?
    • Flow structures/patterns
    • Flow Correlations Categories
    • Mechanistic Model
  • PVT Basics
    • Black oil model or compositional??
    • Review of black oil models
    • Example calculations
  • Inflow Performance Relationship
    • Basic Concepts
    • The Productivity Index Model
    • IPR Relationships (Class Problems)
      • Vogel’s IPR Correlation
      • Fetkovich’s Method
  • Flow through Restrictions
      • Critical Flow Correlations
      • General Calculation Models Well Performance
    • Inflow Performance
    • Outflow Performance
    • System Equilibrium at mid-perf depth, wellhead
    • Parameters influencing inflow and outflow performance
    • Design Examples considering multiple combinations of parameters
  • NODAL ANALYSIS OF CONTINUOUS FLOW GAS LIFTED WELLS
    • Basics of Continuous Flow Gas Lift Design (Class Problems)
    • The Effects of Operational Parameters
    • Nodal Analysis of System Performance
      • Constant Wellhead Pressure Cases (Class Problems)
        • Injection Pressure Given
        • The Equilibrium Curve Method
      • Variable Wellhead Pressure Cases (Class Problems)
        • Solution at the Well Bottom
        • Solution at the Wellhead
      • System Stability
      • Conclusions
  • NODAL ANALYSIS OF SUCKER-ROD PUMPED WELLS
    • Introduction
    • Matching Pumping Rate to Well Inflow
      • NODAL Analysis Basics
      • System Performance Curves
      • Use of System Performance Curves
    • CASE STUDY: Comparison of Energy Efficiency between ESP and Rod Pumping Installations Software based NODAL Analysis
  • NODAL ANALYSIS OF ESP INSTALLATIONS
    • Operational Basics of ESP Systems
    • Basic Installation Design
      • TDH Calculations (Class Problem)
      • Selection of the Pump and Motor
    • NODAL Analysis
      • Using the Q – H Coordinate System (Class Problems)
        • Single Phase Cases
        • Multiphase Cases
      • Simulating the Behavior of the ESP-Well System
    • Power Efficiency of ESP Installations
      • Power Flow in the System
      • Energy Losses in ESP Components
      • System Efficiency
    • CASE STUDY: The Effect of Surface Chokes on ESP System Efficiency
  • Post-test

 

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