Typical Applications for PanSystem® Software

The task of designing, executing, and analyzing a well test depends on operating conditions as well as completion and reservoir type. PanSystem software analyzes a wide range of situations and asset types.

  • Low pressure reservoirs, heavy oil: Wellbore fill-up and leak-off tests, steam injection tests
  • Pumping wells: Acoustically-derived pressures and rates
  • Medium oil reservoirs: Conventional drawdown and build-up tests
  • Gas wells: Conventional analysis using real gas pseudo-pressure, turbulent skin analysis for high-rate wells, and gas well deliverability by empirical (C-and-n) and LIT methods (in depletion scenarios, gas properties are revised as reservoir pressure declines)
  • Volatile oil/condensate reservoirs: Conventional analysis techniques or use of multiphase pseudo-pressure to model phase behavior and its effect on relative permeability (in particular, liquid dropout or gas breakout around wellbore)
  • Hydrothermal wells: Steam production, water injection
  • Gas and water injection wells: Injection and fall-off tests, including multi-region analysis to allow for mobile phase changes and temperature effects
  • Interference tests: Inter-well permeability and ΦCt product from type-curve analysis and/or history matching by simulation
  • Multi-layered reservoirs: Conventional analysis or specialized testing technique (MLT) using selective flowmeter data
  • Varying rate tests: Rates measured on surface or with a downhole flowmeter
  • Permanent downhole (or surface) gauges: Special pressure decline analysis (PDA) section to analyze long-term pressure and rate records for hydrocarbons in place; deconvolution to reveal nature of the reservoir and boundary models otherwise obscured by rate changes and shut-ins
  • Wireline formation tests: Analysis of pre-test, pump-out, mini-DST, and vertical interference tests using dual- and packer-probe analytical models (including special LAS and DPK format data import)

From large scale reservoir characterization to monitoring of individual well performance, PanSystem’s well test analysis provides information for many important operational decisions.

  • Workover: Completion efficiency from skin factor and early time derivative shape; open interval length for stimulation or reperforation; fracture quality
  • Reservoir characterization: Horizontal permeability (from kh); vertical permeability; boundaries and heterogeneities; gas cap/aquifer support; pressure support from a second compartment; layering for reservoir model refinement and field development planning
  • Reserves estimation: Extended production test; long-term flowing pressure record (with permanent downhole gauge); build-up testing for reservoir model refinement and field development planning
  • Production performance prediction: Single well forward prediction with material balance included for field development planning
  • Reservoir pressure decline: for field development planning
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