Drilling & Completions Flashcards
(12 cards)
1
Q
Why use spiral over slick drill collars?
A
Spirals reduce contact area with wellbore, reducing chances of differential sticking
2
Q
Effect of drill collars on drillstring
A
Prevents buckling
3
Q
MY equation
A
MY = (DLS * CL) / SS
4
Q
At what SF do ellipses touch?
A
1.0
5
Q
3 main statistics used to evaluate rig performance in USA?
A
- 24 hr footage max
- 24 hr on bottom %
- total footage YTD
6
Q
In vertical, what 2 factors keep cuttings from falling back down while pumps are off between connections?
A
Gel concentration and mud vis
7
Q
Hydrostatic formula
A
P = 0.052 x MW x TVD
8
Q
Why is MW important in T&D simulations?
A
Calculates buoyancy
9
Q
Below what inclination is the resultant tortuosity not critical for T&D?
A
30 degrees.
10
Q
Why use liner instead of a long string?
A
More cost-effective than running casing string all the way to surface.
11
Q
A
12
Q
A
