Exercises in Pressure Control During Drilling

Description

This is the exercise book accompanying Pressure Control During Drilling

Porous sedimentary formations penetrated by the rock bit contain fluids such as oil, gas or salt water. If the hydrostatic pressure of the drilling fluid drops below the formation pore pressure, pore fluid will enter the well and “kick” the mud out of the well. To control the pressure while drilling you need to understand the behavior of gas. This book aims at explaining the physics and the engineering approaches behind pressures in the sediments, detection of unstable wellbores, equipments necessary to close and kill the well, killing methods and offshore challenges.

Preface

These exercises have been made to fit the content of the book Pressure Control During Oil Well Drilling (http://bookboon.com/no). In present exercise book all the exercises have been solved by students in the corresponding course at the Department of Petroleum Engineering and Applied Geophysics at NTNU of Trondheim, Norway, and revised in 2015. If still any unclear formulations occur, it would be appreciated if the readers contacted me at pal.skalle@ntnu.no along with comments to this collection of exercises.

Pål Skalle

Trondheim, May 2015

Content

1. Formation Pressure
   1. High pore pressure zone
   2. Sedimentary formation pressure
   3. Porosity. Overburden. Sonic log
   4. Porosity. Overburden. Sonic
   5. Pore pressure detection
   6. Pore pressure, dc
   7. Pore pressure detection. dc Overlay curves
   8. Fracture pressure. Poisson’s ratio.
   9. Fracture pressure. LOT
   10. Fracture pressure from field data
2. Killing operation
   1. Preparing for kick
   2. Safety margin
   3. Conventional. Drillers
   4. Kill sheet. W&W. Conventional. Fracturing
   5. Engineer’s method. Conventional. Pressure in 3 points of time
   6. Driller’s. Conventional. Pressure in 6 points of time
   7. Killing. Fracturing. W & W. Conventional
   8. Killing. Fracturing. W & W. Conventional II
   9. Is conventional killing acceptable?
   10. Killing operation. Modified due to high choke line friction
   11. Driller’s. Modified due to high choke line friction II
   12. Engineer’s. Modified. Pressure at time # 2 and 3
   13. Modified. Stop in operation
   14. Modified. More realistic drill string
   15. Modified. More realistic drill string II
   16. Modified and volumetric
   17. Volumetric method
   18. Comparing 3 Killing methods. Annular friction included
3. Gas behavior
   1. Gas transport percolation
   2. Wellbore pressure during 2-phase flow
   3. Wellbore pressure during 2-phase flow II
   4. Real gas behavior
   5. Gas solubility
   6. Gas solubility
4. Deep water and cementing issues
   1. Cold water issues
   2. Deep water shallow formations
   3. Cementing best practice
   4. Cementing in general
5. Additional information