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Rock Mechanics Fundamentals

Competency Statement:

Apply rock mechanics fundamentals to discribe well, reservoir and production behavior.

Learning Objective:

Upon completing this Learning Module assignment, the participant should be able to
  • define the following rock mechanical properties under various conditions of confining pressure, describe how these properties influence wellbore stability, directional drilling considerations, well completion design and other aspects of reservoir development, and know how they are measured in the laboratory:
    • Brinell hardness
    • Tensile strength
    • Normal/shear stress relationships and failure mechanisms (Mohr circles)
    • Young’s modulus
    • Poisson’s ratio
    • Compressive strength
    • Shear strength

Assignment Instruction:

Rock mechanics is a basic element of reservoir description, well design and production optimization. Knowledge of rock mechanical properties is critical to successful reservoir management.

In this assignment, you will define rock mechanical properties based on an analysis of core samples from Well 2A5-NE. You will:

  (1) select core samples for measuring rock mechanical properties
  (2) estimate the overburden and pore pressuress at reservoir depth
  (3) determine rock mechanical properties under reservoir conditions
  (4) calculate rock compressive strength, Young's Modulus and Poisson's ratio,
  (5) Use a Mohr diagram to interpret the reservoir's shear stress rate