Development and Application of Auger Releasing Tool While Drilling for Directional Drilling in Coal Mine

In the process of directional drilling in coal mine, when drilling in the broken formation, because of the instability and collapse of the hole wall, a large number of slag in the hole will cause sticking accidents. Considering the characteristics of drilling technology, supporting pipe characteristics, formation and applicability of hole slag returning situation and other factors, we develop a new type of drilling screw releasing tool, the tool has the advantages of simple structure, convenient installation and can repeatedly break large particles of drilling waste slag in hole and discharge the slag out of the hole by spiral groove auxiliary effect; it shows that the tool can effectively solve the slag sticking problem of hole collapse section and achieves good results by the field application.