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The Cross-Over Sub The Cross-Over Sub
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.
The cross over sub in 4 types of main structure.
|
Sort |
Description |
Upper Connecting Part |
Lower Connecting Part |
Type |
|
1 |
Kell cross-over sub |
Kelly |
Drill pipe sub |
|
|
2 |
Drillpipe cross-over sub |
Drill pipe sub |
Drill pipe sub |
A or B |
|
3 |
Interim cross-over sub |
Drill pipe sub |
Drill collar |
A or B |
|
4 |
Drillcollar crossOver 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 sub |
C |
|
|
|
Drill pipe sub |
Fishing tools |
C |
Type A stand for same diameter :one crossover sub has one size (D)on O.D.,code A.
Type B stands for reduce type:one crossover sub has two sizes (D1,D2) on O.D.,code B.
Type C is left hand thread type:the connection thread is left hand type,code C.
Lifting short sub type: cross over sub has connection on one end used for lifting of drill tool(without structure drawing).
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