Well Test Analysis Workshop

Duration: 4 days

Course Objective: The objective of the Well Test Analysis Workshop is to provide a comprehensive theoretical and practical knowledge of well test analysis techniques. Emphasis will be placed on the practical aspects of well testing and numerous class examples will be offered; a scientific hand calculator will be required. Further, the use of the analysis results as a reservoir management tool to make decisions related to reservoir development and well completion will be illustrated through actual case studies throughout the workshop. Recent developments in testing of Multi-stage Frac of Horizontal Wells (MFHW’s) and Mini fracing (DFIT) are now included. Also, to offer hands-on experience, attendees are encouraged to bring interesting well test data for analysis and discussion in the class, using commercial software. A detailed course hand-out, which is an excellent reference, will be provided.

Audience: This course is aimed at reservoir, petroleum, and exploitation engineers/technologists. Other discipline staff such as geophysicists and geologists who are involved in the field development and exploitation will also benefit from this course.

Course Content:

  • Review of the flow equations
    • Equation of state, Darcy and continuity equation
    • Common flow geometry
  • Dimensionless parameters
    • Definitions and Type Curve use/applications
    • Infinite, Pseudo-steady state and steady state
  • Solution of the diffusivity equation
    • (class problem)
  • Build-up test analysis
    • Principle of Superposition
    • Horner Plot; average reservoir pressure (MBH) method (class problem)
    • Reservoir boundaries and channel analysis
  • Wellbore skin factor and partial penetration
    • (class problem)
  • Wellbore storage
    • use of type curves
    • (class problem)
  • Draw-down testing
    • Application and test analysis and equivalent time
    • Reservoir Limit Testing (case study - fractured basement)
    • Deconvolution techniques
  • Hydraulically fractured wells
    • Fracture characterization (frac. Half-length, conductivity and orientation)
    • Use of type curve techniques and fourth-root time plot to evaluate frac. Efficiency
    • Mini Fracs; benefits and test interpretations (DFIT) – case studies
  • Practical well testing. How to get the most out of well testing
    • Prior to testing - (Well test objectives, types of tests, test design)
    • During the test - (monitoring, optimizing test design)
    • After the test - operational problems, data quality (pressure, production and fluids) - numerous case studies
  • Well test interpretations
    • Flow regime diagnoses using the pressure derivative
    • Conventional analysis
    • History matching of pressure data and selection of reservoir models
    • Case studies
  • Demonstration of pressure recorders
    • Lonkar Services
  • AER well test requirements
    • Guide 40 and electronic submission to AER
  • Gas well testing
    • P, P2 and Pseudo pressure-time methods
    • Gas deliverability testing: single point - Multipoint test (class problem)
    • Simplified and L.I.T. techniques
    • Unconventional gas testing (CBM, shale gas)
    • Rate Transient Analysis (RTA) techniques including; flowing material balance, Blasingame Type Curves, Agrawal normalized rate
    • Gas condensate test analysis
  • Water injectivity tests
    • Step rate and Fall-off tests (case study)
    • Hall Plot (class problem)
  • Naturally fractured reservoirs
    • Characterization of the reservoir using:
    • Pollard and Pirson Method (class study)
    • Warren and Root Method (class study)
    • Bourdet & Kniazeff method
  • Well test planning design
    • Test equipment
    • Flow/Buildup test design (class study)
    • Isochronal test design (class problem)
    • Reservoir limit test (case study)
    • Horizontal well test (case study)
  • Optimization of Multi-stage Fracing of Horizontal Wells (MFHW); including:
    • Hz well spacing
    • Frac size and the number of frac stages
    • Taking advantage of sweet spots – quantifying benefits
    • Case studies
  • Drill Stem Test (DST)
    • Test operation and interpretations of BHP profiles
    • Analysis of DST’s
    • Case studies
  • Review/analyze well tests provided by attendees including using commercial software.
  • Closing comments and a question period

 

Instructor: Saad Ibrahim, P.Eng.

 

     

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