Geomechanics

Reservoir Engineering
By OgbonLab

Measure the stress, respect the friction: the well stays open, the frac goes where you send it, and the fault stays asleep.

The earth as a structure carrying load: the stress tensor and the Mohr circle, effective stress, rock strength, pore-pressure prediction, the stress polygon, the Kirsch equations and the mud-weight window, fracturing, fault reactivation, and depletion, calibrated into a full mechanical earth model on the Ogbon-1 well and ending in a Geomechanics Lab.

13 parts 23 sections Free, browser-native
Start reading → First up: Why Geomechanics? The Loaded Earth

Table of contents

Every section is a working session: text, math, code, interactive widgets. Click any title to jump in.

Part 0: Part 0: The Bridge

  1. Why Geomechanics? The Loaded Earth
  2. From Force to Traction to Stress
  3. The Three Pressures
  4. Four Failures That Built a Discipline
  5. The Toolkit Map

Part 1: Part 1: Stress, the Tensor and the Circle

  1. The Stress Tensor
  2. Principal Stresses and Rotation
  3. The Mohr Circle
  4. Three Circles: Mohr in 3D
  5. Effective Stress Moves the Circle
  6. The Vertical Stress from a Density Log

Part 2: Part 2: Strain, Elasticity, and the Poroelastic Rock

  1. Strain and the Small-Strain Tensor
  2. Hooke's Law and the Moduli
  3. Uniaxial Strain and the Resting Earth
  4. Biot and the Effective-Stress Coefficient
  5. Skempton's B and Undrained Response
  6. Injection, Depletion, and the Stress They Leave

Part 3: Part 3: Rock Strength and Failure

  1. Strength in the Lab
  2. The Coulomb Criterion
  3. Byerlee's Law: Friction Without a Rock Name
  4. Tensile Failure and the Griffith Tail
  5. Hoek-Brown and Curved Envelopes
  6. Compaction and the End Cap

Part 4: Part 4: Pore Pressure

Part 5: Part 5: In-Situ Stress, The Polygon

Part 6: Part 6: The Wellbore, Kirsch and the Window

Part 7: Part 7: Fracturing the Rock

Part 8: Part 8: Calibration, The Ogbon-1 Mechanical Earth Model

Part 9: Part 9: Faults and Induced Seismicity

Part 10: Part 10: The Producing Field

Part 11: Part 11: Review and Final Exam

Part 12: Part 12: The Geomechanics Lab

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