Exercises in Pressure Control During Drilling

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 http://bookboon.com/no (a book that was revised and updated in 2011, mostly on basis of input from readers). Many of the exercises in present book have been solved by students in the corresponding course at the Department of Petroleum Engineering and Applied Geophysics at NTNU of Trondheim, Norway. It would be highly appreciated if you contacted me at pal.skalle@ntnu.no in case there is something unclear in this collection of exercises.

Pål Skalle
Trondheim, September 2011

Preface

1 Formation Pressure
1.1 High pore pressure zone
1.2 High pore pressure zone
1.3 High pore pressure zone
1.4 High pore pressure zone
1.5 Porosity. Overburden. Sonic log
1.6 Porosity. Overburden. Sonic
1.7 Pore pressure detection. General
1.8 Pore Pressure. ROP
1.9 Pore pressure detection. Sonic
1.10 Pore pressure, dc
1.11 Pore pressure detection. dc Overlay curves
1.12 Fracture pressure. LOT
1.13 Fracture pressure. LOT
1.14 Fracture pressure from field data
1.15 Casing setting depth

2 Killing operation
2.1 Avoid kick
2.2 BOP issues
2.3 Prepare for kick. SCR and Shut In Pressure
2.4 Riser margin
2.5 Kick tolerance
2.6 Kill sheet. W&W. Conventional
2.7 Driller’s. Conventional
2.8 Engineer’s method. Conventional. Pressure in 3 situations
2.9 Driller’s. Conventional. Pressure in 6 situations
2.10 Killing. Fracturing. W&W. Conventional
2.11 Killing. Fracturing. W & W. Conventional
2.12 Is conventional killing acceptable?
2.13 Killing operation. Modified for choke line friction
2.14 Conventional vs. modified for high choke line friction
2.15 Kill sheet. Driller’s modified for choke line friction
2.16 Engineer’s. Modified for annular friction. Pressure in situation # 2 and 3
2.17 Modified for choke line friction. Stop in operation
2.18 Modified for more realistic drill string
2.19 Modified for more realistic drill string
2.20 Modified vs. volumetric
2.21 Volumetric
2.22 Volumetric method
2.23 Comparing 3 Killing methods. Modified
2.24 Killing a gas well

3 Gas behaviour
3.1 Gas transport (percolation)
3.2 Gas transport
3.3 Wellbore pressure during 2-phase flow
3.4 Wellbore pressure during 2-phase flow. Task 2008 – 7
3.5 Gas solubility
3.6 Gas solubility

4 Deep water and cementing issues
4.1 Cold water issues
4.2 Shallow Water flow
4.3 SWF
4.4 Deep water issues
4.5 Cementing in general
4.6 Cementing problem (onshore)
4.7 Gas migration during cementing

Solutions - Pressure control

1 Formation pressure
1.1 High pore pressure zone
1.2 High Pore pressure zone
1.3 High pore pressure zone
1.4 High formation pressure zone
1.5 Porosity. Overburden. Sonic log
1.7 Pore pressure detection. General
1.8 Pore Pressure. ROP
1.9 Pore pressure detection. Sonic
1.10 Pore pressure, dc
1.11 Pore pressure detection. dc overlay curve
1.12 Fracture pressure. LOT
1.13 Fracture pressure. LOT
1.14 Fracture pressure from field data
1.15 Casing setting depth in well 34/10-11

2 Conventional and modified p-control
2.1 Avoid kick
2.2 BOP – issues
2.3 SCP and shut in pressure
2.4 Riser margin
2.5 Kick tolerance
2.6 Kill sheet. W & W. Conventional
2.7 Killing. Fracturing. Driller’s. Conventional
2.8 Engineer’s. Conventional. Pressure in 3 situations
2.9 Driller’s. Conventional. Pressure in 6 situations
2.10 Killing. Fracturing. W&W Conventional
2.11 Killing. Fracturing. W & W. Conventional
2.12 Is conventional killing acceptable?
2.13 Killing operations. Modified for choke line friction
2.14 Conventional vs. Modified for high choke line friction
2.15 Kill sheet. Driller’s modified for choke line ular friction
2.16 Engineer’s. Modified for annular friction
2.17 Modified for choke line friction. Stop in operation
2.18 Modified for more realistic drill string
2.19 Modified for more realistic drill string
2.20 Modified vs. volumetric p-control
2.21 Volumetric
2.22 Volumetric
2.23 Comparing 3 Killing methods. Modifie
2.24 Killing a gas well

3 Gas behavior
3.1 Gas transport (percolation)
3.2 Gas transport
3.3 Wellbore pressure during 2-phase flow
3.4 Gas solubility
3.5 Gas solubility

4 Deep water and cementing issues
4.1 Cold water issues
4.2 SWF
4.3 SWF
4.4 Deep water issues
4.5 Cementing in general
4.6 Cementing problem (onshore)
4.7 Gas migration during cementing

Pål Skalle's hjemmeside