Crossover Subs
- PRODUCT DETAIL
Cross-over
sub acts for conversion and connection of drill stem component in petroleum,
natural gas and geology drilling work. It is used mainly for connecting of
upper drill tools and lower drill tools during drilling operations. These
crossovers can be divided into two groups: Straight OD Crossover Sub and
Reduced Section Crossover Sub.
Straight OD Sub
Straight
OD sub is used to connect drill stem members that have a similar outside
diameter. The drill bit, downhole tools, heavy weight drill pipe and drill pipe
can be crossed over using a straight OD sub.
Reduced Section Sub
Reduced
Section Sub is used to connect drill stem parts that have different diameters.
This sub can be used to crossover large OD drilling tools or a tapered drill
collar string.
Main Technical Parameters
|
Sort |
Description |
Upper Connection Part |
Lower Connection Part |
Type |
|
1 |
Kelly cross-over sub |
Kelly |
Drill pipe |
A or B |
|
2 |
Drill pipe cross-over sub |
Drill pipe |
Drill pipe |
A or B |
|
3 |
Interim cross-over sub |
Drill pipe |
Drill collar |
A or B |
|
4 |
Drill collar cross-over sub |
Drill collar |
Drill collar |
A or B |
|
5 |
Drill bit cross-over sub |
Drill collar |
Drill bit |
A or B |
|
6 |
Swivel cross-over sub |
Swivel lower sub |
Kelly |
C |
|
7 |
Fishing cross-over sub |
Kelly |
Drill pipe |
C |
|
Drill pipe |
Fishing tools |
C |
