| Customization: | Available |
|---|---|
| After-sales Service: | 1year |
| Warranty: | 1year |
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CIRCULATING SUB,API 7-1
Circulating sub is connected between wellhead pipe string and ground circulating system.When casing is runnig or finished running, 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,and the later will not be indicated in the operations instructions.
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 
Tianhe Oil Group Huifeng Petroleum Equipment Co., Ltd. is a modernized medium-scale enterprise specialized in production of oil and gas tools. Established in 1973.Main products are mud motor ,drilling jars ,stabilizers ,overshots ,junk subs ,junk baskets ,junk mills ,bucking units ,jar testers ,etc.
Our company has been the class I network supplier and member of council of CNPC--China National Petroleum Corporation; Industrial association member of council of CNPC and SINOPEC_China Petroleum & Chemical Corporation; Assigned supplier of CNOOC; The member of CNPC "ENERGYYAHEAD".
We have API Spec/7-1, 5DP, 5CT, NS-1, ISO9001,HSE ,API Q1 .
All our products exported to many countries in the world and got good reputation from the customers in the world. We are working to be a list company in the near future in China.
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