The circulating sub is a specialized tool for circulating drilling fluid when running in casing on the way or finishing running casing in hole. According to actual needs, there are circulating sub with casing thread and circulating sub with union thread.
Technical parameters and specifications
Type | I.D. (mm) | Thread connection | Type | I.D. (mm) | Thread connection | ||
box thread | Casing thread | box thread | Casing thread | ||||
XHJT88.9×139.7 | 57 | NC26 | 5 1/2 | XHJT114.3×244.5 | 71 | NC50 | 9 5/8 |
XHJT114.3×139.7 | 71 | NC50 | 5 1/2 | XHJT114.3×273.0 | 71 | NC50 | 10 3/4 |
XHJT114.3×177.8 | 71 | NC50 | 7 | XHJT114.3×339.7 | 71 | NC50 | 13 3/8 |
XHJT114.3×193.7 | 71 | NC50 | 7 5/8 | XHJT114.3×508 | 71 | NC50 | 20 |
XHJT114.3×219.1 | 71 | NC50 | 8 5/8 | ||||
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