Drill with casing
Drill with casing
(OP)
Can anyone please share some insights on drill with casing? or recommend anything I can read to understand the process?
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RE: Drill with casing
RE: Drill with casing
RE: Drill with casing
RE: Drill with casing
1. the casing with used with a drillable casing drill bit (sort of like a reamer shoe on steroids). Good for vertical holes. The drillable casing drill bit is lot more expensive than you'd think...
2. A system where a BHA is latched into the bottom of the casing while you are drilling and retrieved when you ar ready to set and cement your casing. This means you can have full L/MWD tools and I think you can even go directional drilling... although maximum dog legs might be less than with conventional drilling.
The main advantages are where you are drilling problem zones with lost circulation formations- the casing drilling can often allow you to get through the problem zone (Tesco claim that the cuttings are 'smeared' over the borehole wall due to the small casing/ hole annulus and this smearing of cuttings acts to stabilise the bore hole wall.... ) without loosing a casing size.
There's less application in terms of speeding up the drilling process- unless you are on a very expensive (ie deep water) rig, the cost of the Tesco gear outweighs the cost savings in terms of reduced well construction time- or at least it did the last time looked at Casing Drilling for one of my wells.
RE: Drill with casing
Thanks for your file. But the 2nd one is blank?
RE: Drill with casing