SELF-REGULATED DRILLING TOOLS AND RELATED SYSTEMS AND METHODS Russian patent published in 2020 - IPC E21B10/42 E21B10/62 

FIELD: drilling of wells.

SUBSTANCE: group of inventions relates to a drilling tool and a method of drawing in and out of a drill bit of a drilling tool. Drill tool comprises a housing, an actuator arranged at least partially inside the housing and a drilling member assembly. Actuator comprises: first and second fluid chambers; at least one reciprocating element, separating first fluid chamber from second fluid chamber; and connecting element attached to reciprocating element in section of reciprocating element facing second fluid chamber. Connecting element leaves the second fluid chamber. At least one reciprocating element is made with possibility of back-and-forth movement inside and inside the first fluid chamber and the second fluid chamber. Drill element assembly is detachably connected to the axial end of the connecting element extending from the second fluid chamber. At least one reciprocating element comprises: a first reciprocating element, made with possibility of back-and-forth movement inside and inside the first fluid chamber and the second fluid chamber; and second reciprocating element, separated from first reciprocating element by at least some distance along actuator lengthwise length. First reciprocating element has front surface and rear surface. Second reciprocating element is made with possibility of back-and-forth movement backwards and forwards inside the first fluid chamber and the second fluid chamber.

EFFECT: technical result consists in improvement of controllability and service life of bit.

19 cl, 5 dwg