- Beijing World-rise Petroleum Technoloty Co., Ltd
- drill collar, square kelly, hexagonal kelly , drill pipe, sprill drill collar, otcg.
- Address:BEIYUAN, BEIJING, China
- Puyang Zhongtai Petroleum Engineering Technolog...
- pump liner, zirconia liner, oil casing, drill pipe, oil tubing, otcg, sucker rod centralizer,Pump Liners,OCTG,Sucker Rod Centralizer,DRILL ROD.
- Address:huanghe, Puyang, Henan, China
- Tianjin Tong Steel Pipe Co., Ltd
- spiral steel pipe, erw steel pipe, seamless steel pipe, coating steel pipe, otcg(casing, tubing), line pipe, pipe fitting, shaped tube.
- Address:jinghai, Tianjin, Tianjin, China
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