Well Testing

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1. 1

   Why and How Wells Are Tested

   • The Purpose of a Well Test
   • Drill Stem Tests, Production Tests and Extended Well Tests
   • Drawdown, Build-up and Other Transient Tests
   • Roles and Responsibilities at a Well Test
   • From Reservoir to Burner: The Flow Path
2. 2

   Surface Well Test Equipment

   • The Flowhead and the Emergency Shutdown System
   • The Data Header and Choke Manifold
   • Heaters and Hydrate Prevention
   • The Test Separator and Its Meters
   • Tanks, Transfer Pumps, Burners and Flare
3. 3

   Downhole Equipment and Test Design

   • The Drill Stem Test String
   • Downhole Gauges
   • Writing the Test Programme: Objectives and Durations
   • Choosing Rates, Sampling and Sand Limits
   • Building Safety into the Test Design
4. 4

   Running the Test and Making Measurements

   • Rig-up, Pressure Testing and the Sequence of Operations
   • Flow Periods, Clean-up and Data Recording
   • Measuring Oil, Gas and Water Rates
   • Gas-Oil Ratio, Water Cut and BS&W
   • Fluid Sampling for PVT Analysis
   • Sand Monitoring During a Test
5. 5

   Pressure Transient Analysis Concepts

   • Radial Flow and Permeability-Thickness
   • Wellbore Storage and Skin
   • The Log-Log Plot and the Pressure Derivative
   • Flow Regimes and Boundaries on the Derivative
   • The Horner Plot and Semi-Log Analysis
   • Productivity Index and Gas Well Deliverability
6. 6

   Reporting, Hazards and Controls

   • Reporting a Well Test
   • High Pressure Hazards and Controls
   • Hydrogen Sulphide at a Well Test
   • Flaring, Burner Efficiency and the Environment
   • Simultaneous Operations and a Complete Test Case