Dear Sir or Madam, Changsha Changtan Machinery Co., Ltd is one professional manufacturer and leading exporters of Premium-quality drilling rigs and drilling tools in China. All sites are ISO9001 Quality Certified. Due to the excellent quality, competitive price, superior service, our products have b…

Henan Xinxiang No.7 Chemical Co., Ltd is one of the most professional manufacturers of drilling fluids additives in China and has expanded rapidly since established in 1998. With the certifications of ISO 9001: 2008 and ISO 14001: 2004, we have been a leading provider in China, a Grade A network ent…