what is WOB
weight on bit
what is ROP
rate of penetration
what is LCM
loss circulation materials, put in mud for use in fractured layers to prevent mud leakage
what is casing shoe
the depth at which the casing is set
why extend the casing to the surface?
- we do not want any changes in volume which results in turbulent flow.
- We need to have access to annulus at any time for well control issues
about how much does a drilling string weight?
20 lb / ft
200,000 lbs total
@ 10,000 ft
what is the main purpose of a drilling rig
Drilling rig= support the weight of all drill string, casing etc
why deviate wells horizontally
- more efficient access to target zones
- drill around salt domes
- relief wells
- produce unconventional reservoirs where the contact area is the thickness of the layer and the permability is low
what are the 3 drilling technologies discussed during the offshore drilling lecture
- Percussion drilling (vertical strikes)
- Rotary drilling
- Special techniques (explosive, flame jet, etc.)
“Rotary drilling is discussed as the most common one”
name the different types of drilling rigs
why are their more varieties of off shore rigs versus land
more difficult drilling conditions
what is bathymetry
Bathymetry: the measurement of depth of water in oceans, seas, or lakes.
name 3 types of seabed surveys
bathmetry
coring
geophysical surveys
what is a jackknife rig
what is a jacking up rig
what is a portable mast rig
what are barge rigs
what are self-contained platform drilling rigs
what is a tender platform rig
what is a submersible rig
what is a cantilever rig
cantilever”: one kind of jack-up platform, in which the mast can move to drill on top of the platform
what is a jack up rig
what is a semi-submersible drilling rig
what is a drilling ship rig
