???????

2005??3??28???????????????
2006??1?£?????????????????API Spec 7-1??API Spec 5CT?????

2008??4?£????????7000?????????è?????????????????????С?
2008??9?£????4000?????????è???????
2009??5?£?????????????????????

2010??5?£????????????????????????

2010??11?£??????è???????????????????????????????????

2011??2?£??????1????????????????????????????Э?頃

2011??3?£??1??????????????????????????????????????????????????????й???????????顣
2012??8?£???????ISO 14001:2004?????????????OHSAS 18001:2007?????????????????????

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