FUNDAMENTALS OF WELL TESTING

Discipline: Reservoir engineering/Production engineering

Level: Basic/Intermediate

Duration: 5 days

Instructor(s): Iván Yemez/ Horacio Stigliano

Purpose

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, build-up 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 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.

Designed

This course is addressed to reservoir/production engineers with basic or intermediate knowledges in well test design, analysis and interpretation.

You will learn

How to:

  • Learn about the basics concepts, objectives, design and execution in Well Testing
  • Know the type of tests and key measurements for Well Testing design and execution
  • Learn about the different methodology and techniques required for the Well Testing interpretation according to well and reservoirs types, fluid flow dynamics, borehole and structural effect
  • Learn about the curve analysis technique and applications for gas, gas and condensate reservoirs.
  • Understand about the non-darcy flow, delivery test and phase distribution
  • Learn about the key well performance parameters and considerations

Content

Fundamentals:

  • Primary reservoir characteristics
  • Basic concepts for test analysis
  • Steady state, semi-steady state, and transient well performance
  • Basic transient flow equation Well testing design and execution

Well testing design and execution

  • Objectives of the test
  • Type of tests
  • Downhole and surface rate measurement
  • Pressure gauge and rate measurement
  • Reservoir fluids sampling

Basic well test interpretation

Methodology

  • Techniques: pressure derivative, type curves matching and specialized plots
  • Early time near wellbore effects: WBS, dimensionless skin factor
  • Radial homogeneous flow: determination of reservoir parameters (K,S).
  • Late time boundary and depletion effects
  • o Single fault
    o Intersecting faults
    o Linear flow (channel sands and parallel faults)
    o Constant pressure boundary
    o Closed reservoirs
  • Heterogeneous reservoir
    o Dual porosity and dual permeability (fissured and layered)
  • o Radial composite
  • Multi-phase flow
  • Hydraulic fracture wells
  • Deviated and horizontal wells

Gas well testing

  • Pseudo-pressure and type curve analysis techniques
  • Well test analysis in gas and gas condensate reservoirs
  • Non-Darcy flow
  • Deliverability tests
  • Phase redistribution

Practical considerations

  • Production index
  • Well inflow performance relationship

Fundamentals of Well Testing

General:

Discipline: Reservoir engineering/Production engineering

Level: Basic/Intermediate

Duration: 5 days

Instructor(s): Iván Yemez/ Horacio Stigliano

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