Tianhe Petroleum Machinery Joint-Stock Co., Ltd was established in 1973 a leading manufacturer and supplier of petroleum machinery equipment and tools. In China . having three subsidiary namely . Huifeng Petroleum drilling tools Co., Ltd xianan Changqing Petroelum Machinery Co., Ltd and Beijing Tianshijiaye Energy Technology Co.,Ltd. The main products include: Drill Collar,HW Drill Pipe,Hydraulic Bucking Units ,Stabilizer,Shock Absorbers,Jar,Fishing Tools,Cemening Tools,Workover Tools,Milling Tools etc. by 2008 we have extended our market to several countries including USA, Russia ,India , Middle east, North America with sales of 200 million yearly .in the meanwhile , Tianhe has been granted the member of council of CNPC .officially become a reputable supplier for CNPC ,ETC . Tianhe Petroleum machinery Co., Ltd has established a complete quality control system, already passed the certification of ISO9001:2000 and got the monogram use authority of API Spec7 overseas major co-partner include “National Oilwell Varco ” “SMITH ” “HALLIBURTON” etc . technical procedure is in accordance with NS-1 Standard ,API standard . production managment adhere to” 6S” system .strict testing procedure covers material testing ,half-finished product testing as well as finished production testing guarantee quality.