Profile: Hebei Longway Petroleum Equipment Co., Ltd. specializes in providing petroleum equipment. We design, manufacture, test and maintain oil drilling tools. Smooth drill collar is the most important component of bottom hole assembly. It provides weight on the bit and offers great help to stabilize the drill and keeps it in tension. It is basically the same as that of regular drill collar, except that the outer surface is smooth and there is no spiral, no elevator. Smooth drill collars are a type of drilling equipment used in the oil and gas industry. They are long, cylindrical pieces of equipment with a smooth outer surface and a hollow interior, and are used to add weight to the drill string in order to maintain stability and control while drilling.