Daqing Huayou Petroleum Technology Development Co., Ltd., established on 2005-07-22, Business scope includes petroleum technology development;Downhole Tools,R&D and manufacturing of drilling accessories;Sales:canopy,canvas,Office Supplies,Computers and Auxiliary Equipment,the paper,furniture,auto parts,building materials,hardware tools,Power material,Wire and Cable,steel,valve,Instrumentation,barite powder,Barite,Automation control equipment,Chemical Products(Does not contain dangerous goods and highly toxic substances),Oilfield chemical additives and their raw materials(Does not contain dangerous goods and highly toxic substances);Engineering and Technology Research and Experimental Development;valve,Maintenance of special equipment and accessories for oil drilling;Metal surface treatment and heat treatment;Seals,rubber products,bearing,Mechanical equipment and accessories,Explosion-proof TV equipment,electronic product,Elevator accessories,plastic products,Manufacture and sales of nylon fiber;R&D and manufacturing of valves;mineral products,Processing of sand and gravel products,Sales(Except for projects prohibited and restricted by industrial policies);Research and development of special equipment for environmental protection;metal products(Except rare and precious metals),gas,Liquid separation and purification equipment,Sales and maintenance of pumps and accessories.