COLLAPSIBLE BIT Russian patent published in 2021 - IPC E21B10/32 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the oil and gas industry, namely to a drilling rock-breaking tool. The collapsible bit contains a body with a thread, a central channel and grooves in which movable blades with rock-destroying elements are installed, a plunger interacting with the blades and bringing them into working position, a tip with a hydraulic hole. The plunger in the upper part is provided with a thread for connection to the drill string. The plunger is made polyhedral in compliance with the polyhedral hole of the housing. The body is equipped with clips that restrict the movement of the movable blades outward due to the shanks made at the ends of the movable blades. The shanks move in the reciprocal grooves of the housing slots. In the upper part, the bit is equipped with a sleeve that restricts the stroke of the plunger and forms a hydraulic chamber with the plunger, communicated by the radial hole of the plunger with the central channel. The tip is equipped with blades and hydraulic monitoring holes between the blades with at least the number of blades, the working parts of the movable blades and the tip blades are made with a bend of the outer surface. In this case, the bit is equipped with at least three movable blades.

EFFECT: increase in the reliability and durability of the drill bit for solid face drilling of extended size wells of the required calibrated diameter of the wellbore and stable in length, as well as the elimination of emergency situations when extracting the bit.

1 cl, 3 dwg