METHOD FOR CONSTRUCTING HYDROGEOLOGICAL WELLS BY MEANS OF SCREW DRILLING Russian patent published in 2022 - IPC E21B10/43 E21B10/44 E21B43/12 

FIELD: drilling.

SUBSTANCE: invention relates to a method for constructing hydrogeological wells by means of screw drilling. The specified method consists in using a screw projectile, as which a drill bit is used, along the outer case of which carbide cutters and screw edges are located. The drill bit is equipped with an opening sealing cap, which is fixed with a locking pin on its end using an eye on the axis with a rubber seal. Drilling is carried out with hollow equal-bore screws. The cavity of a screw column under the sealing cap is filled from the surface with water at least to the level of ground or pressure water. When the project depth is reached, drilling is stopped, the screw projectile is lifted, and a filter column is immersed into the inner cavity of the screw projectile for the possibility of its installation through the cap opened by the introduced filter column to the required mark, then the screw column is removed from the well, and the annular space is filled with sand and tamponed.

EFFECT: increase in productivity in the construction of hydrogeological wells.

2 cl, 2 dwg