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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. And we can design and manufacture special types of subs to satisfy clients' ideas or drawings.
Lift Sub: Enables safe handling of straight OD tubulars such as drill collars, shock tools, and jars by using drill pipe elevators.
Saver Sub: Protects the Kelly thread. Loosening of threads is performed at the bottom of the Saver Sub, reducing wear and tear on the more valuable parts of the drill string.
| Description | Upper Connection | Lower Connection | Type |
|---|---|---|---|
| Kelly cross-over sub | Kelly | Drill pipe | A or B |
| Drill pipe cross-over sub | Drill pipe | Drill pipe | A or B |
| Interim cross-over sub | Drill pipe | Drill collar | A or B |
| Drill collar cross-over sub | Drill collar | Drill collar | A or B |
| Drill bit cross-over sub | Drill collar | Drill bit | A or B |
| Swivel cross-over sub | Swivel lower sub | Kelly | C |
| Fishing cross-over sub | Kelly/Drill pipe | Drill pipe/Fishing tools | C |
Supplying a full line of equipment for O&G, horizontal directional drilling (HDD), and micro-tunnelling. Products include drilling rig components, downhole tools, fishing tools, and well control equipment. Certified by ISO: 9001-2000, ensuring rigorous quality management for global clients.
A: We use high-quality alloys such as 35CrMo, 40Cr, or 4137H to ensure durability and performance under high pressure.
A: Yes, we provide customized manufacturing based on client drawings or specific technical requirements for tool joints like NC26, NC50, or Vam Top.
A: Our products are certified by ISO: 9001-2000 and follow International Petroleum Standards with a rigorous internal quality control system.
A: A Saver Sub is designed to take the wear and tear of frequent connections, protecting the more expensive components like the Kelly or the rotary head.
A: We can produce up to 1000 pieces per month, ensuring timely delivery for large-scale operations.
A: All tools are securely packed in sturdy wooden boxes to prevent damage during sea or air transport.
