Aug 16th a Aug 17th, Oilbayer i komo i loko o ka 'oihana maʻamau o "Oil Well Cement Performance Requirements" i hoʻonohonoho 'ia e ka National Oil and Gas Standardization Committee Drilling Engineering Sub-Technical Committee ma Yichun City, Heilongjiang Province, a komo i ka hoʻololi 'ana i ka cementing pili. ʻenehana.
Ka manawa hoʻouna: Sep-10-2018