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Standard
Divert Dart - SDD
|
Standard
Diverter Dart Overview
- The
SDD is the Dart of choice for most drilling applications.
When
pumped into place, the SDD holds the ports open and blocks off
the through-bore to the BHA below. When the pumps are off, the
ports of the valve remain open.
With
the versatility of offering multiple applications, the SDD is
also a time saver for tripping dry to surface and or jetting BOP's
| SDD
Primary Applications |
|
- Spotting
LCM
- Hole
Cleaning
- Dry
Tripping
- BOP/Wellhead
Jetting
- Differential
Sticking
- Fluid/Mud
Displacement
- Pack-Offs
- Pipe
Filling
|
|
|
|
| Flow
control |
Pumps
on
|
Pumps
off
|
| Flow
to annulus |
Yes
|
Yes
|
| Flow
from annulus |
No
|
Yes
|
| Flow
to bit |
No
|
No
|
| Flow
from bit |
No
|
No
|
©
Copyright Churchill Drilling Tools 2011 |
| SDD
Data Sheet |
|
| Function
|
Opening |
| Length |
12" |
| Opening
shear resistance |
20,000
psi |
| Closing
shear yield |
2,000
psi |
| Rec'd
Opening Speed |
250gpm/6bpm |
| Maximum
Opening Speed |
350gpm/8bpm |
| Max.
Freefall Angle (@ zero gpm) |
55° |
| Bypass
TFA Ratio |
100% |
| No.
of Cycles |
5* |
*When Standard 100" Catcher Deployed |
|
Case
History:
Cure losses, hole clean then trip out of hole dry
Onshore Italy 2010 ENI set about an ambitious
pair of wells - Monte Alpi & Monte Enoc – with valves used in both
the extended 12-1/4” and 8-1/2” sections. primarily as a loss-curing contingency.
Great value was provided additionally when tripping out of hole. On each
run the Standard Diverter Dart was used to condition the hole as well
as giving a faster dry-tripping exit. With loss intervals also cured the
darts delivered both specified performance and enhanced operating efficiencies.
Conclusion: SDD delivers LCM spotting and Hole Cleaning performance
with added savings from the inherent dry-tripping mode. |
