WES Trainings

Fishing Operations (Drilling and Work-Over Operations)

Course Outline

Day - 1
  • Rock Mechanics 
    • Stress –strain diagrams 
    • Geo-mechanics and structural geology 
    • Mechanics and causes of folding 
    • Mechanics and causes of faulting and fractures 
    • Factors affecting the bore hole stability 
    • Induced factors affecting bore hole stability 
    • Drilling fluid effect on bore hole stability 
    • Shale stabilization   
  • Wellbore Stability 
    • Mechanical conditions 
    • Shale deposition and sedimentary rocks 
    • Clay Chemistry 
    • The Earth’s stresses 
    • Mechanical stress failure 
    • Chemical interactions 
    • Physical interactions 
    • Well site Analysis 
Day - 2
  • What is Stuck Pipe? 
    • Primary cause of downtime 
    • See warning signs and respond 
    • Stuck pipe is almost always preventable 
    • Definition 
    • Causes 
    • Mechanical 
    • Formation problems 
    • Human error—lack of communication 
  • What causes Stuck Pipe? 
    • Human factors 
    • Lack of team work 
    • Lack of communication 
    • Lack of planning 
    • Failure to read warning signs 
    • Failure to follow procedures 
    • Most stuck pipe situations happen at tour change 
    • Use tour change form to record conditions and identify trends 
  • Types of sticking 
    • Formational sticking 
    • Differential sticking 
    • Cause for most stuck pipe situations 
    • Drilling overbalance most common cause 
    • Geopressured formations 
    • Reactive formations 
    • Unconsolidated formations 
    • Mobile formations 
    • Fractured or faulted formations 
    • Mechanical sticking 
    • Key seating 
    • Wellbore geometry 
    • Under-gauge hole 
    • Inadequate hole cleaning 
    • Junk in the hole 
    • Cement problems 
    • Casing problems 
  • Differential sticking 
    • Most common in sandstone and high permeability formations 
    • Why circulate fluids in hole? 
    • Remove cuttings 
    • Seal the wellbore 
    • Control well pressure 
    • Mud formulation 
    • Drilled overbalanced defined 
    • Filter cake defined 
    • Drill string flexing defined 
    • Avoiding differential sticking 
    • Rotate 
    • Circulate 
    • Move drill string up and down 
    • Communicate 
    • Differential sticking definition 
  • Case Histories (workshop) 
Day - 3
  • Warning Signs 
    • Three mechanisms—definitions and causes 
    • Hole pack off or bridge mechanism 
    • Differential mechanism 
    • Geometry mechanism 
    • The hole is talking—definitions and descriptions 
    • Torque changes 
    • String weight changes 
    • Circulation rate changes 
    • Pump pressure changes 
    • Mud properties 
    • Changes at the shakers 
    • Your records indicate changes 
    • Name the mechanism—simulation 
    • Talk to others around the rig 
    • Gather clues 
    • Come up with a diagnosis 
  • Prevention plan 
    • Review three sticking mechanisms—definitions and causes 
    • Differential 
    • Wellbore geometry 
    • Hole pack off/bridging 
  • Have a stuck pipe prevention plan 
    • Team work and communication 
    • Mud must be ready and conditioned properly when it returns to the surface 
    • Chemicals and mixing agents must be on hand to avoid delays 
    • Hydraulics are important 
    • Shaker hand should communicate what’s shaking to the driller 
    • Mud logger examines cuttings communicate with the driller 
  • Case Histories (workshop) 
Day - 4
  • Fishing Operations 
    • Twist Off Cases 
    • Fracture of the drill pipe 
    • Fracture of the threads joining the drill collars or the drill pipe 
    • Overshot 
    • Free point indicator 
    • Reserve twist 
    • Small explosive charge 
    • Addition of jars in the fishing string 
    • Washing over 
    • Plugging the hole 
    • Side tracked hole (dog-leg) 
  • Broken bit cases 
    • Break away of one of the conical cutters & leg down the hole with all the bearing 
    • Using magnet for fishing 
    • Using hollow basket 
    • Using explosive charge for too large pieces of metals 
    • Using another bit 
  • Case Histories (workshop) 
Day - 5
  • Case Histories (workshop) 
  • HSE related issues 
  • General discussion and solving the client problems 
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