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This course will stress the practical application of modern techniques in well test analysis, with a special emphasis on the pressure derivative. Various pressure analysis techniques will be used to analyze flow tests, buildup tests with or without phase redistribution, multi-rate tests, interference tests, and pulse tests. Interpretation of pressure tests under multiphase flow conditions, hydraulically fractured wells, naturally fractured reservoirs, slanted wells, and horizontal wells will be discussed in great detail. Participants will be introduced to the TDS technique, which is an alternative option to type-curve matching technique, convolution, and regression analysis. The manual includes step-by-step procedures to interpret pressure transient tests, such that participants will be able to immediately apply the knowledge and skills gained to their job assignments upon course completion. Concepts will be illustrated by several daily Excel-based exercises and workshops.
Application of Pressure and Derivative to Drawdown and Buildup Tests
On the first day, participants will learn how to understand the theory, applications, and practical limitations of conventional pressure analysis techniques. Acquiring the skill to use the pressure derivative by recognizing unique finger prints of various flow regimes will also be covered.Day 2
Hydraulically Fractured Wells and Gas Well Testing
How a post-frac pressure test may well be the most important and only effective tool to assess, both qualitatively and quantitatively, the stimulation treatment will be covered. Participants will be given simple equations, based on the pressure derivative, for calculating permeability, skin factor, fracture length, fracture conductivity, and fracture inclination angle.Day 3
Naturally Fractured Reservoirs and Carbonates
The fact that carbonate reservoirs produce a major portion of the world’s oil and gas will be the main focus on this day. Participants will also learn that they hold more than half of the world’s largest crude oil and natural gas reserves. Yet, accurately predicting amounts and types of porosity and, therefore, original oil-in-place and reserves, is still a major challenge in carbonate reservoirs. Attendees will learn how to characterize the four different types of NFR, how to use unique finger prints of the pressure derivative to delineate the fracture system intensity and extent, as well as how to quantify reservoir pore volume.Day 4
Multiphase Flow, Multirate Tests, and Partially Perforated Wells
On this day, participants will learn how fluid properties change with pressure and how they are used to calculate effective permeability to oil, gas, and water. How to use the TDS technique to analyze pressure buildup tests preceded by variable rate will also be covered. Determining vertical permeability will be one of the most important objectives of this day’s presentations. Detailed discussion of spherical flow and MDT will be presented.Day 5
Slanted and Horizontal Wells
Participants will become familiar with several methods to analyze pressure drawdown and buildup tests in horizontal wells, including pressure-based conventional techniques, and techniques that are strictly based on the pressure derivative. This is the only course where attendees will learn how to analyze the elliptical flow regime using the pressure derivative.
Petroleum Engineers who want to understand well testing principles and want to apply advanced modern interpretation techniques to analyze pressure transient tests.
A basic understanding of fluid flow equations and a familiarity with fundamental concepts of reservoir engineering and subsurface production.
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