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Workover fishing tool
CIRCULATING SUB
- Type:Workover fishing tool
- CAS No:
- Qty in 20' FCL:
- Min. Order:
- Packaging:
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Thread/Model
I.D.(mm)
Length(mm)
Drill pipe box connection
Casing threag
NC38
5 BTC
57
500
5 LTC
5 ST & C
NC38
5 1/2 BTC
57
580
5 1/2 LTC
5 1/2ST& C
NC50
7BTC
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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The circulating sub is connected between wellhead pipe string and ground circulating system. When casing is running or finished sunning ,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.
