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Possible causes: motor stall, motor drive shaft card dead, or bit plugged blocked...
According to the vibration-knocking tool and structure ,is hydraulic and mechanical in terms of its structure....
· Difference of the thread structure (datum mark-All products); · Difference ofhardness test position (NS-1 increase full cross section hardness test-all pr...
The diameter of the drilling device is worn out, and the outside diameter of the inner whorl is expanded larger than the following table, and shall be scrapped...
была образована в 2010 году, Основная продукция компании: утяжеленые бурильные трубы, веду...
“濮阳因石油而建、而兴，得天独厚的技术优势和人才优势，使其石油装备产品在国内外市场都具有较强的竞争力。”中国石...
