Drilling crossover sub
– **Product Type:** API standard drilling crossover sub, also known as saver sub or drill bit sub.
– **Classification:** Crossover subs are categorized into drill string crossover and tubing crossover.
– **Drill String Crossover Types:**
– Type A
– Type B
– Type C
– **Function:** Crossover subs serve to connect different components of the drill string or tubing, allowing for compatibility between various tools and equipment used in drilling operations.
– **Compliance:** Manufactured in accordance with API standards to ensure quality, reliability, and compatibility with industry requirements.
Specification
| Denotation | Top junction block | Lower junction block | Type |
| Kelly joint | Kelly | Drill pipe joint | A or B |
| Kelly joint | Drill pipe joint | Drill pipe joint | A or B |
| Drill pipe joint | Kelly | Drill collar | A or B |
| Crossover joint | Drill collar | Drill collar | A or B |
| Bit joint | Drill collar | Bit | A or B |
| Swivel joint | Swivel lower joint | Kelly | Type C |
| Fish joint | Kelly | Drill pipe joint | Type C |
| Drill pipe joint | Fishing tool | Type C |
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