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Pressure Control During Oil Well Drilling

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Language:  English
Porous sedimentary formations penetrated by the rock bit contain fluids such as oil, gas or salt water.
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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.

  1. Introduction
    1. Scope of this book
    2. The drilling process
    3. Geological sediments
    4. About Pressure Control in sedimentary rocks
    5. Principle of barriers and safety aspects
  2. Pressure in the sediments
    1. Predictive models
    2. Quantifying formation pressure
    3. Fracture pressure
  3. Well Control Equipment
    1. BOP stack and associated equipment
    2. Remote control of the BOP
    3. Volumetric unstable well (kicking well)
    4. Closing procedure during drilling operations
    5. Well integrity during drilling operations
  4. Standard killing methods
    1. Surface and bottom pressure of a shut-in well
    2. Hydraulic friction during killing
    3. Killing by means of Driller’s Method
    4. Engineer’s Method
    5. Killing when unable to circulate from bottom
    6. Pressure control during Underbalanced Drilling
    7. Killing operations
  5. Modification of the standard killing method
    1. Modification due to narrow pressure window
    2. Killing with irregular drill string geometry
    3. Wellbore strengthening
  6. More realistic gas behavior
    1. Transport of gas
    2. Wellbore pressure during two phase flow
    3. Gas solubility
  7. Special offshore safety issues
    1. Low sea temperature
    2. Other deep water problems
    3. Shallow sands below deep sea water
  8. Gas migration through cement
    1. The cement slurry
    2. Cementing operations
    3. Gas migration
About the Author

Pål Skalle

Pål has worked as a professor with students for more than 40 years. His favorite activity has been to be their guide, supervisor and co-author.  

He is especially eager to develop new, useful knowledge, and to make it known for a broader audience. For this purpose, he has written and co-authored more than 100 technical papers, and has acted as editor of the SPE Journal of Drilling & Completion. In 2008 he achieved the prestigious SPE award “A Peer Apart” for evaluating more than 100 SPE peer review journal papers.  

One issue Pål is proud of is the authoring of a guide of how to build up a master thesis in a logical and focused manner. This guide he wrote for master students in Petroleum engineering at University of Eduardo Mondlane in Maputo, Mozambique. 

It should also be mentioned that Pål is eager to bring good and even crazy ideas out into the real world. For this purpose, he was the co-founder of four different privately-owned production companies. 

His topics of interest includes: 

·         Drilling and cement slurry technology

·         Wellbore safety and stability

·         Down hole operational errors and failures