Description

Designed for you, if you are...

• A professional who is directly involved in pressure transient interpretation or dealing with service companies offering well testing for geothermal wells
• A geologist, reservoir engineer, supervisor or manager who is involved in formation evaluation, geothermal potential estimation and general reservoir engineering
• A professional with basic understanding of well testing and interpretation

How we build your confidence

• Numerous examples and exercises to develop your interpretation skills
• Exercises are based on both simulated and real field examples
• Training on test design and prediction runs

The benefits from attending

• Select the appropriate test methodology
• Select the required downhole and surface equipment
• Design the test sequence
• Interpret the test data utilising the newest methodology including deconvolution
• Predict the well performance behaviour

Topics

• Reasons for well testing
• Methodology of well testing
  - Initial perturbation
  - Constant pressure vs. constant rate condition
  - How to deal with wellbore storage
  - Types of well test sequences
• Hardware options - How the well test data is gathered
  - Testing while drilling
  - Testing after completion of drilling
  - Traditional vs. wireline formation testing
  - Surface equipment and safety in well testing operations
• Theory behind interpretation
  - Historical overview from straight line to deconvolution
  - Flow geometries and regimes
  - Unified approach for well test interpretation
• Test design
• Interpretation approach
  - Superposition concept
  - Diagnosing near wellbore conditions, reservoir behaviour and boundaries
  - Deconvolution
  - Dealing with limited reservoirs
  - Predicting the well behaviour

• Reservoir characterisation
  - Determine the temperature, pressure, and permeability of the geothermal reservoir
  - Assess the reservoir's fluid characteristics, including composition and phase (liquid, steam, or a mixture)
• Well performance evaluation
  - Measure the well's capacity to produce geothermal fluids
  - Identify potential issues such as scaling, blockages, or casing integrity problems
• Resource assessment
  - Estimate the sustainable production rate of the well
  - Provide data for reservoir simulation models to predict long-term behaviour

• Flow tests
  - Measure the well's flow rate under different conditions to assess productivity
  - Short-term flow tests and long-term flow tests
• Pressure transient tests
  - Analyse pressure changes over time to infer reservoir properties
  - Constant rate tests, constant pressure tests and interference tests
• Injection tests, either constant rate or constant pressure
  - Involve injecting water or other fluids into the well to evaluate permeability and pressure response
  - Useful for assessing the reservoir's ability to accept re-injected fluids during operation

• Downhole sensors
  - Measure temperature, pressure, and flow rate directly within the wellbore
  - Tools include quartz pressure gauges, thermocouples, and spinner flowmeters
• Surface equipment
  - Includes separators, flow meters, and tanks to handle and measure produced fluids
  - Data acquisition systems to record and analyse test data in real-time
• Geochemical sampling
  - Collect samples of geothermal fluids for chemical analysis
  - Provides information on fluid composition, scaling potential, and reservoir conditions

• Pressure-Temperature (P-T) Analysis
  - Evaluate the P-T profile of the well to determine potential gradient anomalies
  - Identify geothermal gradients and reservoir boundaries
• Flow rate analysis
  - Plot flow rate vs. time to assess well productivity and identify transient behaviours
  - Use analytical models to estimate permeability and skin factor
• Numerical simulation
  - Use reservoir simulation software to integrate well test data and model reservoir behaviour
  - Predict long-term production potential and optimise well and reservoir management

• Complex reservoirs
  - Geothermal reservoirs often have complex fracture networks and variable permeability, complicating analysis
  - Accurate modelling requires high-quality data and sophisticated interpretation techniques
• High temperatures and corrosive fluids
  - Equipment must withstand extreme conditions and potential corrosion
  - Regular maintenance and calibration of instruments are essential for accurate measurements
• Environmental and regulatory compliance
  - Ensure testing procedures comply with environmental regulations and minimise impact
  - Proper handling and disposal of geothermal fluids to prevent contamination