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Exercises in Pressure Control During Drilling

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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.
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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.

These exercises have been made to fit the content of the book Pressure Control During Oil Well Drilling. 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. 

Pål Skalle

Trondheim, May 2015

  • Preface 
  1. Fluid Properties 
    1. Rheology control 
    2. Rheology control
    3. Flocculation 
    4. Mud contamination 
    5. Flocculation 
    6. Fluid additives 
    7. Fluid additives 
  2. Rheological models 
    1. Bingham/ Power law
    2. Bingham/Power-law 
    3. Bingham / Power-law. Regression 
    4. Effective viscosity 
    5. All models 
    6. All models. Regression 
    7. All models 
  3. Drilling fluid dynamics 
    1. Velocity profile. Continuity equation 
    2. Velocity profile. Momentum flux 
    3. Velocity profile 
    4. Pressure loss vs. rheology I 
    5. Pressure loss vs. rheology II 
    6. Pressure loss. Power-law 
    7. Pressure loss. Turbulent. Energy equation 
    8. Pressure loss vs. flow rate 
    9. Pressure loss. Use field data to evaluate model 
    10. Pressure loss. Effect of rotation 
    11. Pressure loss. Nozzles. OFU 
    12. Swab pressure. Cling factor 
    13. Swab pressure 
  4. Hydraulic program 
    1. Mud pump issues 
    2. Optimal nozzles? Section wise 
    3. Liner selection. Section wise 
    4. Hydraulic program. Section wise (i.e. all liners are treated as if in range I) 
    5. Optimal parameters for BHHP. OFU. Section wise
    6. Liner selection. Complete well 
    7. Liner selection. Complete well 
  5. Well challenges 
    1. Filtration control 
    2. Filtration control 
    3. Cuttings concentration I
    4. Cuttings concentration II 
    5. Density control 
    6. Density control 
    7. ECD. Barite
    8. ECD. Fluid and flow 
    9. Water activity 
    10. Shale stability 
    11. Shale stability 
    12. Wellbore problem 
  6. Supportive Information 
    1. Pump (National 12-P-160) and hydraulic program data 
    2. Pressure loss equations 
    3. Conversion factors and formulas 
  • Solutions to exercises in drilling fluid engineering
  1. Fluid Properties - Solutions 
    1. Rheology control - Solution 
    2. Rheology control - Solution 
    3. Flocculation - Solution 
    4. Mud contamination - Solution 
    5. Flocculation - Solution 
    6. Fluid additives - Solution 
    7. Fluid additives - Solution 
  2. Rheological models - Solution 
    1. Bingham / Power-law - Solution 
    2. Bingham / Power-law - Solution 
    3. Bingham / Power-law. Regression - Solution 
    4. Effective viscosity - Solution 
    5. All models - Solution 
    6. All models. Regression - Solution 
    7. All models - Solution 
  3. Drilling fluid dynamics - Solution 
    1. Velocity profile. Continuity equation - Solution 
    2. Velocity profile. Momentum flux - Solution 
    3. Flow profile - Solution 
    4. Pressure loss vs. rheology I - Solution 
    5. Pressure loss vs. rheology II - Solution 
    6. Pressure loss. Power law - Solution 
    7. Pressure loss. Turbulent flow. Energy equation - Solution 
    8. Pressure loss vs. flow rate - Solution 
    9. Pressure loss. Field data - Solution 
    10. Pressure loss. Effects of rotation - Solution 
    11. Pressure loss. Bit nozzle. OFU - Solution 
    12. Swab pressure. Clinging factor - Solution   
    13. Swab pressure – Solution 
  4. Hydraulic program – Solution 
    1. Mud pump issues – Solution 
    2. Nozzle selection. Section wise – Solution
    3. Liner selection. Section wise – Solution 
    4. Hydraulic program. Section wise – Solution 
    5. Optimal parameters with BHHP. OFU. Section wise –Solution 
    6. Liner selection. Complete well – Solution 
    7. Liner selection. Complete well – Solution
  5. Wellbore challenges – Solutions 
    1. Fluid Properties - solutions 
    2. Filtration control – Solution 
    3. Cuttings concentration I – Solution 
    4. Cuttings concentration II – Solution 
    5. Density control – Solution 
    6. Density control – Solution 
    7. ECD. Barite – Solution 
    8. ECD. Flow rate & fluid consistency – Solution 
    9. Water activity – Solution 
    10. Shale stability – Solution 
    11. Wellbore problems – Solution
    12. Shale stability - Solution 

excellent document ....highly recommended for new grad in Engineering with the desire to get into oil and gas engineering.
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