The KAPPA foundation pressure transient analysis (FPTA) course has been designed to teach the generic methodology and the practice of pressure transient analysis (PTA) in addition to the mechanics of Saphir NL software which is learnt almost as a by-product. The emphasis is therefore on a visual and conceptual approach to interpretation including only essential mathematics. Full theory, including formulae and derivations are provided, as well as the conceptual explanation of PTA in the accompanying KAPPA dynamic data analysis (DDA) handbook provided to each attendee.

Field examples are used to illustrate each concept. The final afternoon is a workshop, to which participants are encouraged to bring their own data.

By the end of the course the attendee should be capable of performing analyses and developing interpretations typically required of a transient test analyst. In addition, the attendee should have the foundations sufficient for developing further experience in transient analysis.

The foundation pressure transient analysis (FPTA) course is the first week of the two-week dynamic data analysis (DDA) course and can be taken as part of a continuous two-week session or as a single standalone one-week course.

None

The use of Saphir NL, the PTA module of the Ecrin DDA software suite, will be taught as part of this course.

Introduction to Darcy’s law and the equation of state leading to the diffusivity equation, the principle of superposition, infinite-acting radial flow, wellbore storage and skin and pseudo-steady state. A short history of transient analysis; semilog and Horner plots, loglog analysis and the Bourdet pressure derivative, build-up and multirate analyses leading to the essential PTA workflow.

Comparison of gauge pressure and temperature channels.

Differential pressure analysis to determine gauge offsets (gauge quality) and fluid phases. Test design taking into account test objectives and constraints and then integrating gauge limitations and running ‘what if’s?’ Gas tests: real gas law and gas diffusion, the use of pseudo pressures and pseudo time and a consideration of the limitations of classical PTA tools for gas. AOF and IPR.

Pattern recognition and matching for basic well and reservoir models; wellbore storage, skin, homogeneous and double-porosity reservoirs, vertical, fractured and limited entry wells.

The infinite acting reservoir, identifying faulted, channel and closed systems and pressure support. Reserve estimation and precautions.

Introduction to the use of numerical modeling when applied to PTA that will include building a model of irregular shape with multiple wells.

The final afternoon is an opportunity to work with real data provided by attendees or specific cases from the extensive KAPPA example catalogue.