Non-magnetic Drill Collar Length Selection

Non-magnetic drill collars get more general use in drilling operations, having a very good performance, other drill can not be replaced. Non-magnetic drill collars located in the lower part of the drill pipe, in the upper part of the drill bit and downhole drill, it is a major component of the BHA. Non-magnetic drill collars are made of low magnetic permeability stainless steel, inside and outside the tube cross section is circular. Well trajectory measuring instrument is non-magnetic drill collar to prevent magnetic interference, which could affect measurement accuracy.

Non-magnetic drill collars not only play a role in the drill collar in drilling horizontal wells, but also has low permeability, it can be used as the downhole magnetic measuring instruments to create a non-magnetic interference working environment.