During Drilling operation, major wear and tear wear often take place between drill pipes and casings. Wear Sub is used to avoid such wear between drill pipes and casings. With features, such as compact structure adn easy operation, wear sub can prolong the service life of drill pipe and casing and reduce the vibration and trembling of drilling tools. It can also limit the contact friction between metals.

The wear sub consists of a highly wear rubber sleeve, a metal stiffening liner and a sub body. The rubber sleeve is installed in the middle of sub body and some clearance is given to allow sleeve to rotate freely. The rubber sleeves are made of rubber mixtures with good wear resistance.

During drilling operation, the rubber sleeve and sub body can make a relative rotation. The rubber sleeve OD is larger than drill pipe tool joint OD, therefore the tool joint and drill pipes cannot come in contact with casing. The rubber sleeve on wear sub will first contact casing. When friction between rubber sleeve and casing takes place, wearing can be reduced due to the rubber sleeve wear resistance and softness. Usage of tool joints of drill pipes and drill string tools will also be reduced.

Technical Parameter