Cross-Over Subs Downhole Tools Cross Over Subs Oilfield Drilling Tools Equipment
Description
Cross-over sub acts for conversion and connection and is the basic component in downhole work. It is divided into drill string cross-over sub and tubing Cross-over sub. Drill string Cross-over sub is divided into type A, type B and type C.
Specification
Denotation |
Top Junction Block |
Lower Junction Block |
Type |
Kelly sub |
Kelly |
Drill pipe sub |
Type A or B |
Drill pipe sub |
Drill pipe sub |
Drill pipe sub |
Type A or B |
Crossover sub |
Kelly |
Drill collar |
Type A or B |
Drill collar sub |
Drill collar |
Drill collar |
Type A or B |
Bit sub |
Drill collar |
Bit |
Type A or B |
Swivel sub |
Swivel lower sub |
Kelly |
Type C |
Fish sub |
Kelly |
Drill pipe sub |
Type C |
Drill pipe sub |
Fishing tool |
Type C |
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