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Circulating Sub

Circulating Sub

Circulating Sub

The circulating sub is connected between wellhead pipe string and ground circulating system. When casing is running or finished running, the circulating sub is connected to make fluid circulation. According to the application, the circulating sub is connected between Kelly and casing or between casing and hose. The former is used for fluid circulation during connecting of casing. The later generally is used after connecting of casing.

Construction
The circulating sub during running casing is equipped with casing pin thread on one end or DP thread and DP box thread or union thread on other end.

Specifications – Circulating sub

Thread/ Model

I.D.(mm)

Length(mm)

Drill pipe box connection

Casing thread

NC38

5 BTC

57

500

5 LTC

5 ST & C

NC38

5 1/2 BTC

57

580

5 1/2 LTC

5 1/2 ST & C

NC50

7 BTC

71

600

7 LTC

7 ST & C

NC50

9 5/8 BTC

71

620

9 5/8 LTC

9 5/8 ST & C

NC50

10 3/4 BTC

71

670

10 3/4 LTC

10 3/4 ST & C

NC50

13 3/8 BTC

71

670

13 3/8 LTC

13 3/8 ST & C

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