API Certificated Circulating Sub

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 . The circulating sub produced in our company belongs to the former.

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Technical Specification:

The circulation joint is connected between the wellhead string and the ground circulation system, and the circulation joint can be circulated to the drilling fluid when the casing is in or out of the casing. According to the application, it can be divided into a casing one drill pipe circulation joint and a casing one water hose circulation joint. The casing one drill pipe circulation joint is used when the drilling fluid needs to be circulated in the middle of the casing, and the casing one water hose circulation joint is used for Use after the casing is finished.

The circulating joint used in the middle of the casing is provided with a male thread of the casing at one end and a joint of the female thread of the drill pipe at the other end. The circulating joint for the casing is completed, one end is a male thread of the casing, and the other end is a two-way joint which is short-circuited.

Specifications - Circulating Sub Wtth Drill Pipe Thread
Thread/ Model			I・D. (m)	Length (m)
Drill pipe box connect ion	Casing thread	Product Code
NC38	5 BTC	J030701	57	580
	5LTC	J030702
	5STC	J030703
NC38	5 1/2 BTC	J030801	57	580
	5 1/2 LTC	J030802
	5 1/2 STC	J030803
NC50	7 BTC	J031201	71	610
	7 LTC	J031202
	7 STC	J031203
NC50	9 5/8 BTC	J031801	71	610
	9 5/8 LTC	J031802
	9 5/8 STC	J031803
NC50	10 3/4 BTC	J031901	71	610
	10 3/4 STC	J031902
NC50	13 3/8 BTC	J032001	71	650
	13 3/8 STC	J032002

Specifications - Circulating Sub With Hammer union Thread
Thread/ Model			LD. (nm)	Length (■m)
brill pipe Box connection	Casing thread	Producl Code
2“ 502 Union	5 BTC	J040701	50.8	500
2-1502 Union	5 1/2 BTC	J040801	50.8	500
2"1502 Union	7 BTC	J041201	50.8	500
	7LTC	J041202
2"1502 Union	9 5/8 BTC	J041801		500
	9 5/8LTC	J041802
2"1502 Union	10 3/4 BTC	J041901	50.8	560
	10 3/4 STC	J041902
2"1502 Union	13 3/8 BTC	J042001		610
	13 3/8 STC	J042002