API Certificated Circulating Sub (drilling circulating sub)
Description:
The Well drilling Circulating Sub is used to circulating drilling fluid while running casing or finishing of the casing running to do the mud circulation from the rotary hose directly to the casing of the downhole.
Use:
1. The top of circulation head connects to the kelly, the bottom connects to the casing. It is used to circulate the cement slurry before cementing. Sometimes the cementing head can be replaced by lifting circulation head.
2. The top of circulation head connects to the hoses, the bottom connects to the casing.
3. Its upper end is drill pipe box or union, the nether end is casing pin. It is a crossover(X/O) with hollow inside.
4. Main body are made from AISI4145H alloy steel. There are circulating head with casing thread and circulating head with union thread(all size).
| Connection Type |
I.D.(mm) |
Overall Length(mm) |
| Male Connection |
Casing Connection |
| NC38 |
5" BTC |
57 |
500 |
| 5" LTC |
| 5" STC |
| NC38 |
5 1/2" BTC |
57 |
580 |
| 5 1/2" LTC |
| 5 1/2" STC |
| NC50 |
7" BTC |
71 |
600 |
| 7" LTC |
| 7" STC |
| NC50 |
9 5/8" BTC |
71 |
620 |
| 9 5/8" LTC |
| 9 5/8" STC |
| NC50 |
10 3/4" BTC |
71 |
670 |
| 10 3/4" LTC |
| 10 3/4" STC |
| NC50 |
13 3/8" BTC |
71 |
670 |
Main products:
1. Pumping unit
2. Tubing pump/sucker rod pump and accessories
3. Float collar and float shoe
4. Casing centralizer
5. Cementing plug
6. Cementing head
7. Stage Collar
8. Casing/ Tubing coupling
9. Drill pipe
10. Sucker rod
Audited Supplier 
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