Aug 16 mpaka Aug 17, Oilbayer adatenga nawo gawo pamakampani a "Oil Well Cement Performance Requirements" omwe adakonzedwa ndi National Oil and Gas Standardization Committee Drilling Engineering Sub-Technical Committee ku Yichun City, Province la Heilongjiang, ndipo adatenga nawo gawo posinthanitsa ndi simenti yofananira. luso.
Nthawi yotumiza: Sep-10-2018