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  • 2014 The ZHONGGUOLONG Oil Services S.A was registered in Ecuador.
  • 2014 Longyuan Hengtong Petroleum Technology Co. Ltd., a joint venture company formed by Tong Oil ToolsCompany (China Stock Code 300164) and Beijing YilongHengye, to further expand overseas business.
  • 2013 Dragon Oil Technologies was registered in US and put into successful operation.
  • 2013 Yilong entered into the SiChuan, Northwest Bureau. Tarim Oilfield and Xinjiang Oilfield Market .
  • 2012 Yilong started overseas oilfield services in Kazakhstan and Myanmar, the Middle East, Africa.
  • 2011 Yilong entered into Yanchang, SinopecJianghan, Sinopec Nanyang and Sinopec East China.
  • 2010 Yilong entered into Sinopec Shengli, Jiangsu and PetroChina Changqing.
  • 2009 Yilong entered into Sinopec Northeast.
  • 2008 Yilong entered into Sinopec North China.
  • 2006 Yilong entered into Sinopec Puguang.
  • 2005 Yilong entered into Sinopec Zhongyuan .
  • 2005 Yilong was founded in Beijing.