BHA Components Junk Sub – contains a narrow trough which exists in the sub to collect small pieces of metal. Shock Sub – dampens the drill bit vibration. Sacrificially prolongs the life of the drill string, bit and rig. They are not stiff when compared to drill collars. They tend to be limited to straight … Continue reading BHA Components
Stabilizing Tools Essentially they centre the BHA in the hole. The basic types are rotating and non- rotating. In soft rock it can gauge the hole. The rotating type has blades that are spiraled around the body. The blades can be integral, namely molded onto the body, welded to the body or fastened to the … Continue reading Stabilizing Tools
Bottom Hole Assembly (BHA) Configuration There are three (3) types of bottom hole configurations; TYPE I - standard, simple configuration, drill collars and drill pipe only. Neutral point lies within the drill collars. TYPE II – uses the heavy weight drill pipe as a transition between the drill collars and the drill pipe. Weight on … Continue reading Bottom Hole Assembly (BHA) Configuration