METHOD OF WELLS DRILLING Russian patent published in 2018 - IPC E21B7/00 E21B4/02 

FIELD: mining.

SUBSTANCE: invention relates to the field of mining, namely, to the wells drilling methods with core sampling. Wells drilling method involves lowering into the downhole of the downhole hydraulic motor consisting of stator and rotor forming working chamber, core tube with core receiver, and the washing liquid supply. During the downhole hydraulic motor formation, attaching the semi-cylindrical blades with arc-shaped partitions to the stator, longitudinally dividing the working chamber into internal and external cavities, communicating to each other, connecting the core tube to the stator, and the core receiver is to the rotor. During drilling, the washing liquid supply is carried out along the rotor multistage central channel and at each stage the washing liquid flows through dividers and coupled to them side channels are directed to the semi-cylindrical blades inner surfaces middle sections with the rounded turn relative to the arc-shaped partition. Rotating the stator around the rotor. After that, from the working chamber outer cavity part of the washing liquid is discharged into the annular space through thee stator multi-level openings in direction opposite to its rotation, washing liquid remaining part from the working chamber internal cavity is directed to the well bottom.

EFFECT: enabling reduction in consumption of the supplied to the well washing liquid and the core structural integrity taken from the parent rock.

1 cl, 2 dwg