The design of the Shank Adapter is critical to safe and successful drilling operations. Accidental shank tail wear can cause significant costs and even the loss of the well itself. In the drilling phase, the most expensive component is the cross drill shank. In addition to the expensive materials, the cost that may be encountered when replacing worn or damaged shank shanks is due to its potentially catastrophic accidents such as oil leakage and shank wear. Will cause more serious problems to the operator.

It is necessary to study the torque and resistance of the shank during drilling operations. For example, forward drilling or tripping produces resistance, while rotation produces torque. The contact between the shank and its tool joint is inevitable. The gravity acting on the shank always pulls the pipe to the lower side of the wellbore, and the axial tension on the shank tends to push the pipe to the upper side of the pipe. According to the weight of the pipe, the axial force along the pipe will first be calculated from the bottom element of the pipe. The weight and torque on the drill bit are balanced for each element. This stepwise calculation also determines the lateral force The direction and size of the shaft will push the shank to the shaft.

Under the action of this lateral force, the rotary tool joint on the shank shank abuts against the inside of the shank shank, gradually removing the steel from the shank shank wall, and forming a crescent-shaped wear on the shank shank, friction between the two contact surfaces The severity depends on the nature of the friction surface and mud.

Compared with the shank, the tool joint coating plays a greater role here. Tungsten carbide coated on the tool joint is a very good protection device for the joint, but if there is rough tungsten carbide, it will wear the shank a lot to reduce the wear.

The shank-friendly joint coating is selected. The type of mud and its additives play an intermediate role in shank wear. The wear of the shank tail caused by water-based mud is twice that of oil-based alternatives. Lubricants can reduce friction and wear severity . Generally speaking, high lateral force and severe shank wear will cause more rotation time between the joint and the shank at a higher speed, which will cause corrosive wear.