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

Dimensionless parameters

  • 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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