stuck pipe

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Main causes of NPT

• stuck pipe
• lost circulation
• well control
• tool failures
• rig downtime
• wellbore instability
• sloughing shales
• kick
• flows
• WOW

• stuck pipe
• lost circulation
• well control
• tool failures
• rig downtime
• wellbore instability
• sloughing shales
• kick
• flows
• WOW

Causes related to pore pressure and wellbore
instability represent 41 of the total (Dodson,
2004)
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In 2005 NPT due to pore pressure and wellbore
instability represented 44
Hans Borge Hans Martin Helset Olav-MagnarNes
SINTEF Petroleum Research
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Petris DrillNET Wellbore Stability
Enter Planned Trajectory
Obtain Stability Chart
Enter Rock Properties
Enter Formation Pressures
Obtain Safe Mud Weight Range
Run Sensitivity Analysis
Obtain Mud Weight Window
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And Petris DrillNET Pore Pressure Prediction
Use the model that better fits your case
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They will help lower Drilling NPT
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Estimate of NPT costs for all industry wells

• Report from
• AMOCO 600 Million to 1 Billion per Year
• ARCO 17 of Total Cost of Wells
• MOBIL Min. 10 of Total Cost of Wells
• Western-Atlas 6.4 Billion per Year
• HAL Shell 8 Billion/1996 or 30 of Total
  Cost of Wells
• Salomon Bros 15 of Total Drilling Cost in 1996
• API Survey High Mud Losses in 19-24 of all
  Hole Sections
• GRI OGS 500-750 Million/year for Unstable
  Shales
• SHELL 500 Million/year in Unstable Shales
• BP (DeepStar) 167.6 Million/1985-97 SWF (123
  deepwater wells)

1998 Review (1985-1997 Data)
Ron Sweatman HAL RPSEA Forum at USC Nov. 2006
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Impact of optimized well planning
The application of formal project management
techniques to wells has increased significantly
within the last decade as people have realized
the performance benefits they offer. Clay and
Hatch1 summed up the situation well when they
identified that 70 of the deficiencies in their
earlier well delivery process lay in the lack of
project definition and planning rather than poor
performance.
S. Sawaryn, D. Dressler, K. Been, T.
Bailey Deploying Common Process Across global
Wells Teams SPE 95442 SPE Annual technical
Conference and Exhibition October 2005, Dallas,
Texas
1 Clay, T., Hatch, A. A New Well Design And
Construction Process. SPE57561 SPE/IADC Middle
East Drilling Technology Conference November
1999, Abu Dhabi
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Petris DrillNET The integrated suite of drilling
engineering applications is the perfect solution
for your well planning needs
Design Trajectories
Optimize Hydraulics
Select the right Casing
Simulate Cementing Jobs
Minimize Casing Wear
Run Sensitivity Analysis for Torque Drag
Simulate DrillString Run