PTA/RTA Week 1

  • Modern pressure and rate transient analysis (PTA/RTA).
  • Strong practical emphasis on real data with many real-life examples.
  • Immediate return on investment with attendees able to perform commercial analysis upon completion of the courses.

This course, spread over two weeks, has been designed to teach the generic methodology and the practice of pressure and rate transient analysis (PTA and RTA) in addition to the mechanics of Saphir and Topaze software which is learnt almost as a by-product. Although the emphasis is on a visual and conceptual approach to interpretation including essential mathematics, the full theory, including formulae and derivations, as well as conceptual explanations, are provided in the accompanying KAPPA Dynamic Data Analysis (DDA) handbook provided in electronic format to each attendee.

Field examples are used to illustrate each concept. By the end of the first week the attendee should be capable of performing analyses and developing interpretations.

Course programme: Week 1

Basic theory of diffusion

The basic principles and terminology governing both PTA and RTA. 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 and basic gas testing. When to use PTA or RTA … or both.

PTA methodology and Saphir practical

The evolution of methodology from the most simple straight-line Horner to the current model-on-the-fly Bourdet derivative applied to vertical wells and introducing fundamental concepts such as skin, well-bore storage and infinite acting behaviour. The basic Saphir workflow is introduced including data load, edit, QAQC, synchronization, model selection, classical methods, the derivative and the application to field examples.

Well, reservoir and boundary models

Finite/infinite conductivity fractures, limited entry and slanted/horizontal wells. Homogenous and heterogeneous model behaviour including 2Φ, 2κ composite. Single, intersecting, parallel fault and closed systems. Includes typical errors encountered when diagnosing a boundary effect with an illustration of superposition effects and the influence of production duration on the analysis.

Single well deconvolution

The principle and the use of the complete production and pressure history in transient analysis, the use of the method for seeing deeper into the reservoir coupled with limitations and caveats illustrated by worked examples to help us define, question and verify the reservoir limits.

Basic numerical models

The principle of the linear (single phase) numerical model, how to build a model including defining the well type, composite zones, faults and thickness.

Gas Tests

The IPR AOF options in Saphir and specific gas testing features.

Multiphase flow (Perrine method)

How the multiphase cases can be handled with linear solutions.

Test design

How the test design helps to reach the well test objectives.


All courses are conducted in English unless otherwise notified.
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