•As the formation pressure increases, the density of the drilling fluid is increased to balance or slightly overbalance the well and keep it in control
•Pressure exerted by the drilling fluid while static is called hydrostatic pressure
•Drilling fluids are typically weighted up with heavy material such as barite, calcium carbonate, hematite and in extreme situations galena
•The well is considered under control when no formation fluids or gasses are allowed into the well bore
–In some situations small amounts of background gas are allowed into the well bore the well bore may be considered in control if the flow is controllable •Hydrostatic pressure is also used to control unstable wellbores
–Formations may be tectonically stressed especially in deviated wells
–Drilling fluid density can be increased to balance the tectonic stress and help provide a stable wellbore
•Density of drilling fluid ranges from air (0 psi/ft) to 20 lb/gal (2400 kg/m3)
•Pressure exerted by the drilling fluid while static is called hydrostatic pressure
•Drilling fluids are typically weighted up with heavy material such as barite, calcium carbonate, hematite and in extreme situations galena•The well is considered under control when no formation fluids or gasses are allowed into the well bore
–In some situations small amounts of background gas are allowed into the well bore the well bore may be considered in control if the flow is controllable •Hydrostatic pressure is also used to control unstable wellbores
–Formations may be tectonically stressed especially in deviated wells
–Drilling fluid density can be increased to balance the tectonic stress and help provide a stable wellbore
•Density of drilling fluid ranges from air (0 psi/ft) to 20 lb/gal (2400 kg/m3)
No comments:
Post a Comment