DOWNHOLE ROTOR DRILLING ASSEMBLY WITH ELEMENTS CONTACTING ROCKS AND WITH CONTROL SYSTEM Russian patent published in 2015 - IPC E21B7/08 

FIELD: oil and gas industry.

SUBSTANCE: invention refers to the field of controlled drilling of oil and gas wells. The controlled drilling assembly includes control system placed inside a cylindrical body connected to the drilling bit having radially retractable pistons. The fluid activating the piston flows from the body through the fluid dosing unit, which directs the fluid to the fluid channels in the drilling bit, which lead to the respective pistons. The control system controls the fluid dosing unit in order to ensure selective passing of the fluid though the fluid channels to pistons and to let it out through the outlet in each fluid channel. Selective passing of the fluid forces pistons in the drilling bit to retract in the direction opposite to the desired deviation of the well bore, thus deviating the drilling bit from the axial line of the well bore. The fluid dosing unit is capable to stabilise total area of the flow, to control total area of the flow and change total area of the flow inside the drilling bit by moving the upper element inside the fluid dosing unit.

EFFECT: control system and drilling bit are connected in a special way to facilitate separation in order to change configuration and size of the control section and cutting design of the drilling bit simultaneously.

42 cl, 45 dwg