• Categories of stuck pipe
• The Mechanisms
• Clay Chemistry
• Shale Problems
• Symptoms of shale problems
  • Soft cuttings
  • Clay balls in the flowline
  • Bit and stabiliser balling
  • Tight hole tripping and problems logging
  • Problems increase with time
• Mud Types: use of inhibitors
• Flow rates: Optimum field values
• Pressures
• Effects of hole angle
• Warning signs of inadequate hole cleaning
• Shaker evidence
• Packing off by drill cuttings
• Freeing stuckpipe by drilled cuttings
• Assessment exercise
• ECD
• Control of ECD
• Key seating
• Cement blocks
• Green cement
• Junk
• Ledges and doglegs
• Mobile Formations
• Creep mechanism
• Collapsed casing
• Casing design method across salt sections: uniform and non-uniform loading
• Casing selection across salt sections
• Effects of placement of production packer
• Undergauge hole
• Assessment exercise

Wellbore Stability

• Earth stresses
• Current theories of hole fracture
• Tensile failure mechanism
• Hole collapse mechanism
• Effects of hole angle on wellbore stability
• Effects of azimuth on horizontal well placement
• Safe mud weights envelope
• Detailed Exercise

Differential Sticking

• Differential sticking mechanisms
• Porosity & permeability effects
• Factors affecting differential sticking
• Freeing differentially stuck pipe
• Pipe freeing agents
• Reduction of mud hydrostatic pressure
• Dealing with kicks while freeing stuck pipe
• The U-tube method
• Exercises

Decision Trees

• First actions – Primary freeing methods
• When stuck by solids or pack off
• When stuck differentially
• When stuck other than solids or differential

Back Off Operations

• Determining free point
• Stuck Pipe Forces: Calculations
• Drillstring forces theory
• Max allowable load
• Maximum allowable torque
• Combined loading
• Free point calculations
• Back-off operations
• Assessment exercise

Jars And Accelerators – How They Work

• Mechanical Jars
• Hydraulic jars
• Hydro-mechanical jars
• Fishing jars
• Accelerators
• Jar forces
• Jar envelopes
• Cocking
• Firing
• Placement
• Fishing Economics
• Exercise

Fishing Equipment & Operations

• Review of fish tools
• Milling tools and assembly
• Hole cleaning and swarf removal
• Window milling
• Milling junk
• Standard fishing tools

Review

• Test (1 ½ hrs)