Akuhata 16th ki Akuhata 17th, i uru a Oilbayer ki te paerewa ahumahi o "Oil Well Cement Performance Requirements" i whakaritea e te National Oil and Gas Standardization Committee Drilling Engineering Sub-Technical Committee i Yichun City, Heilongjiang Province, me te whai waahi ki te whakawhiti i te cimenting e pa ana. hangarau.
Te wa tuku: Sep-10-2018