Circulating SUB

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.

Parameter of Circulating SUB

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.

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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