Download - Drilling Problems
PowerPoint Presentation
FishSomething breaks in or fall down the well during drillingFising tool is used to retrieve the fish
SpearD < D pipe
OvershootD > D pipe
Washover Pipe
Tapered Mill Reamer
Junk MillWireline Spear
Pipe StickingDifferential Sticking
Mechanical StickingCaused by :- Drilled CuttingsCaused by :- Formation Pressure > Hydrostatic Pressure
- Borehole instability- Keyseating
Mechanical Sticking
Sloughing ShaleSoft shale adsorbs water from the drilling mud expands out falls to the bottom of the well
Loss of CirculationLost circulation : uncontrolled flow of whole mud into formation thief zone
Formation DamageThe permeability of the reservoir rock is reduced as a result of foreign-fluid invasion
Corrosive GassesCorrosive gasses : CO2, H2S hydrogen sulfide embrittlement
Abnormal High PressureFluid pressure in formation > hydrostatic pressure cause blowout or kick