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E-388 - Advanced Well Test Analysis

  • Geoscientists and reservoir engineers with experience
  • To provide an extensive and practical knowledge for designing and analyzing complex well tests in an efficient way
Learning Objectives
  • To devise or recommend a well test design
  • To learn about the various well test analysis models
  • To perform a well test interpretation using an up-to-date software package
  • Some practical knowledge of well testing operations and basic interpretation theory are recommended
Ways and means
  • Interactive courses and exercises
  • Hands-on practice using state-of-the-art software
  • Workshop using real field case data

Well testing: objectives and hardware review
  • Purpose of well testing types of tests, well testing equipment, metrology
Basic equations and methods
  • Darcy's law - Superpositions (Time, space), multi-rate testing, boundaries
  • Matching derivative
  • Exercises
Wellbore conditions
  • Constant / Changing Wellbore Storage - Vertical fracture (Finite, Infinite) - Horizontal well
  • Skin(s) factors and families
  • Analysis using software package
Reservoir models
  • IARF: infinite acting radial flow - Double porosity reservoirs - Two-layer reservoir - Radial composite
  • Analysis using software package
Boundary models
  • One sealing fault - Two parallel sealing faults - Two intersecting sealing faults - Leaky Fault
  • Closed system, reservoir limit testing and depletion effects - Constant pressure boundary
  • Analysis using software package
Test design - Practical session
  • Rate history definition - Multi wells models - Time and pressure error
  • Pressure gauge drift & noise
  • Phase segregation - Procedures for Interpretations validations and Results Consistencies - Reporting
Gas wells: theoretical review and applications
  • AOFP, Pseudo Skin, Pseudo Pressures, Gas Material Balance, Pseudo Time or Changing WBS
Numerical simulation of well tests using reservoir simulation programs
  • Fluid flow in porous media and reservoir heterogeneities
  • Numerical simulation of well tests with a grid block model: problems and solutions
  • Advanced interpretation of the simulation results
  • The "objective function". Matching the petrophysical properties of the reservoir model and the well characteristics:
  • The inversion process applied to the evaluation of the reservoir characteristics
  • Introduction to the WELGEM™ Software. Field applications
  • The step forward. Matching the geological properties of the reservoir model:
  • Geostatistical modeling constrained by well tests
  • Introduction to the simulation of well tests with a numerical simulation program
  • Practical inversion of several well tests: test of a channel, test of a model made of several reservoir facies, etc.
  • Presentation of a simultaneous interpretation of several well tests
R&d recent developments
  • Latest R&D developments in the domain of integration of well tests in reservoir modeling