Vertical pressure profiles obtained from wireline multiple pressure testers have become an important tool for improved determination of reservoir pressure and fluid distributions. Procedures and techniques for data acquisition to better ensure the quality of both strain and quartz gauge pressure data for vertical profiles are presented. Tool calibration checks, wellsite monitoring and consistency checks, techniques for normalizing pressure surveys within the same well or different wells, and sampling strategies are given. Examples are used to illustrate these procedures and techniques.
In addition, field examples of vertical pressure profile plots and interpretation of these plots are used to illustrate applications for:
Defining fluid contacts and identifying oil reservoirs in fresh water environments.
Defining multiple fluid contacts throughout an apparently continuous oil section.
Identifying multiple pressure regimes in a supernormal pressure environment.
Identifying zones of differential reservoir depletion as a result of low permeability or an impermeable barrier.
Estimating fluid properties at reservoir conditions.