Overview

Cross-over sub

Cross-over sub plays an important role in switching and connection of drill stem in oil and gas drilling work.

There are three types for cross-over sub in structure:

Type A: OD of the top end and bottom end are in same size.

Type B: OD of the top end and bottom end are in different size

Type C: Rotation of connection Thread is left-hand thread.

Circulating sub

The circulating sub is connected between wellhead pipe string and ground circulating system. When casing is running or finished running, it is connected to make fluid circulation. 

Float valve sub

Float valve sub is a bit sub in which a float valve is installed. It’s connected at upper part of drill bit, the float valve assembly in sub is near the bit connecting thread and the float valve sub also can be necessary position of drill string.

Pup joint

The pup joint is used to adjust the height of full length tubing or casing strings, it is also used to adjust the depth of downhole tools.

Specifications:

Standard: API 5CT

Size: 2 3/8", 2 7/8", 3 1/2", 4 1/2"

Grade: J55/K55/N80/L80/P110

Length: 2FT/3FT/4FT/5FT/6FT/8FT/10FT/12FT

Safety Joint:

We provide two kinds of safety joint-- AJ type safety joint and H type safety joint.

Specifications - AJ Type Safety Joint

Specifications - H Type Safety Joint