• Class and Course

    Practical Petroleum Geomechanics with Techlog

    This course covers the fundamentals of geomechanics for wellbore applications. It covers the topic of the origin of stresses in the subsurface and how in situ stresses can be understood from wellbore data. Mechanical properties such as rock strength and elastic properties are introduced and their determination in the laboratory as well as from log data is discussed. The origins of pore pressure and how it is measured and estimated is discussed and shown. The course then proceeds to show how all discussed concepts can be put together to build a Mechanical Earth Model and how this is used to examine critical problems in exploration and field development. Throughout the course the theoretical lectures are accompanied by practical exercises using the latest SLB Techlog Geomechanics modules as well as pen-and-paper exercises. 

    Learning Objectives

    At the end of the course attendees will be able to:

    • Use routinely collected and specialized data to make basic geomechanical calculations for wellbore stability and sand production
    • Build 1D Mechanical Earth models from data in existing wells
    • Perform Wellbore stability predictions and sand production predictions and apply to well planning

    Key Learning Elements

    Fundamental understanding of well-centric petroleum geomechanics.

    • Data requirements for geomechanical studies
    • The use of the 1D Mechanical Earth Model in geomechanical studies
    • Perform 1D Wellbore stability and sand production predictions
    Day 1

    Fundamentals of well-centric geomechanics

    • Value of well-centric geomechanics in the petroleum industry
    • Introduction to geomechanics concepts: The stress tensor, units, principal stresses, strain, resolving stresses on a plane, construct Mohr's Circle and analyze stress, elasticity and elastic properties, effective stress, internal friction, cohesion, modes of rock deformation, unconfined compressive strength, Mohr-Coulomb failure
    • Techlog Introduction and basic exercises: General overview of Techlog, data loading and QC, building a mechanical stratigraphy
    Day 2

    Rock mechanical properties and introduction to the Mechanical Earth model

    • Introduction to experimental rock mechanics, uniaxial and triaxial testing, scratch testing, tensile tests, results analysis
    • Concept and construction of the Mechanical Earth Model, data requiremens and types of input data
    • Techlog exercises on modeling mechanical properties and calibration with core data
    • Techlog basics of Acoustic log processing and QC
    • Introduction to Python in Techlog and how to script locally-calibrated rock property correlations
    Day 3

    1D Stress modeling (overburden, pore pressure and horizontal stresses)

    • Principal earth stresses, regional and local stresses, World Stress Map, Andersonian classification of faults, overburden stress, horizontal stress orientation, borehole breakouts, drilling-induced tensile fractures, image logs, horizontal stress magnitudes, leak-off tests, fracture gradients
    • Origins of pore pressure, methods for measurement, methods for estimation, vertical and horizontal methods, Eaton’s method, real-time approach
    • Techlog exercises on modeling overburden, pore pressure and horizontal stress magnitude
    • Introduction to Techlog image log functionalities and stress direction analysis
    Day 4

    Wellbore stresses and wellbore stability

    • Wellbore geomechanics, state of stress in the wellbore
    • Modes of rock deformation in the wellbore, the effect of well azimuth and inclination, simple calculations
    • An introduction to planning for wellbore stability and real time operations
    • Techlog exercises to perform wellbore stability analysis from existing well trajectory, wellbore stability sensitivity analysis (safe mud weight window versus wellbore orientation), history matching of wellbore stability prediction to wellbore failure observations
    • Introduction to reservoir geomechanics and the effects of pressure depletion on stresses
    • Techlog exercises on horizontal stress estimation in depleted zones
    Day 5

    Completions geomechanics

    • Sand production prediction and sand management, causes of sand failure, experimental evidence, an introduction to screenless completion design for sand prevention
    • Introduction to Hydraulic fracturing, process of hydraulic fracturing, geomechanical factors effecting fracture development and simple calculations
    • Techlog exercise to use 1DMEM for sand production prediction

    Geomechanicists, geologists, geophysicists, drilling engineers, production engineers, completion engineers, and reservoir engineers concerned with well planning.

    Basic understanding of Petroleum exploration and production

    Familiarity with Techlog Base modules 

    Currently there are no scheduled classes for this course.

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