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ICTD International Centre for Training and Development

Advanced Well Test Analysis

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Description

This five-day 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.

Course Objectives

Upon successful completion of this course, the delegates will be able to:

  • Familiarize 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
  • Learn how fluid properties change with pressure and how they are used to calculate effective permeability to oil, gas, and water
  • 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
  • Learn how to understand the theory, applications, and practical limitations of conventional pressure analysis techniques

Course Outline

Day 1

APPLICATION OF PRESSURE AND DERIVATIVE TO DRAWDOWN AND BUILDUP TESTS

  • Review of fundamental concepts of well testing and measurement techniques (Video Presentation)
  • Pressure-based analysis of flow and buildup tests
  • Derivative-based analysis of flow and buildup tests, TDS technique
  • Determining Average reservoir pressure
  • Drainage area and pore volume of bounded systems, oil in place

Day 2

NATURALLY FRACTURED RESERVOIRS AND CARBONATES

  • Evaluation of carbonate reservoirs (Video)
  • Indicators and types of NFR
  • Pseudo-steady state and unsteady state matrix flow models
  • Storativity and Porosity Partitioning coefficient
  • Fracture porosity from well logs and well test analysis
  • Interpretation of interference and pulse tests, pressure derivative

Day 3

HYDRAULICALLY FRACTURED WELLS AND GAS WELL TESTING

  • Practical aspects of fracturing and acidizing (Video)
  • Uniform-flux and infinite-conductivity models of hydraulic fractures
  • Finite-conductivity: linear, bilinear, and elliptical flow
  • Geometry of inclined hydraulic fractures

Day 4

SLANTED AND HORIZONTAL WELLS

  • Effect of slant on pressure-response
  • Determining angle of inclination of slanted well and partial penetration/perforation skin
  • Overview of horizontal well completions and performance (Video)
  • Flow regimes and analytical solutions
  • Applications of pressure derivative to calculate directional permeability values
  • Pressure analysis of hydraulically fractured horizontal wells

Day 5

MULTIPHASE FLOW, MULTIRATE TESTS, AND PARTIALLY PERFORATED WELLS

  • Role of fluid properties, Perrine Permeability
  • Dynamic Reservoir Testing (Video)
  • Conventional and modern interpretation of multi-rate tests
  • Applications of TDS, convolution and deconvolution techniques
  • Partially completed/penetrated/perforated wells
  • Vertical permeability from spherical flow, MDT

Course Methodology

A variety of methodologies will be used during the course that includes:

  • (30%) Based on Case Studies
  • (30%) Techniques
  • (30%) Role Play
  • (10%) Concepts
  • Pre-test and Post-test
  • Variety of Learning Methods
  • Lectures
  • Case Studies and Self Questionaires
  • Group Work
  • Discussion
  • Presentation

Who should attend

This course is intended for all Petroleum Engineers who want to understand well testing principles and want to apply advanced modern interpretation techniques to analyze pressure transient tests as well as for engineers, geologists, and technologists who do not work with pressure transient evaluation techniques on a day-to-day basis, but want to improve their understanding of this important technology.

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