Pansystem-2011-download

PanSystem® software has been the industry’s leading well-test analysis program for more than 20 years. It is a robust yet easy-to-use software tool that provides multiple options for models and analysis. These options include industry standards as well as user-defned models for additional fexibility. Ultimately, the PanSystem application provides a way to simplify complex transient well testing through detailed analysis, simulation and reporting. PanSystem software is dedicated to transient well testing, a key technical function in the oil and gas industry. A pressure transient well test has the unique capability to obtain information from within the reservoir surrounding the well and, with appropriate testing and analysis techniques, can provide a wealth of data: • Permeability of the reservoir-at-large and, in some cases, the near- wellbore region • Completion effciency, effective open interval size (over the life of the well) • Reservoir structure (boundaries, heterogeneities) • Reservoir pressure • Nature of any pressure support • Drainage area, connected pore volume, and initial hydrocarbons in place • Vertical permeability, vertical communication in layered systems • Well performance (over the life of the well) • Communication between wells • Deliverability and production forecasts Typical applications © 2010-2011 Weatherford. All rights reserved. PanSystem® Well-Test Analysis Software 3 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 fll-up and leak-off tests, steam-injection tests • Pumping wells: Acoustically derived pressures and rates • Medium oil reservoirs: Conventional drawdown and buildup 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 falloff tests, including multiregion analysis to enable mobile phase changes and temperature effects • Interference tests: Inter-well permeability and ΦCt product from type-curve analysis and/or history matching by simulation • Multilayered reservoirs: Conventional analysis or specialized testing technique (MLT) using selective fowmeter data • Varying rate tests: Rates measured on surface or with a downhole fowmeter • 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 effciency 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 refnement and feld-development planning • Reserves estimation: Extended production test; long- term fowing pressure record (with permanent downhole gauge); buildup testing for reservoir model refnement and feld-development planning • Production performance prediction: Single well forward prediction with material balance included for feld-development planning • Reservoir pressure decline: for feld-developmen