Profile: Mudanjiang Petroleum Downhole Tools Co., Ltd. specializes in providing fishing, milling, drilling, overwork & cementing tools and digital flow quality measurement equipments. Our drilling tools include rotary reamer, kelly valve, coring tools, directional bend sub and key seat reamer. Our kelly valve is also known as kelly cock. It is a drill tool necessary to control blowout pressures. Our rotary reamer is used for stabilization purpose and in every reaming operation of abrasive layer. It is used to borehole from 71/2 inch to 26 inch. Our float collar\float shoe is a heat-resisting, sealer and drillable tool. It is used for protection and production casing.