PERCUSSION-ROTARY FACILITY (VERSIONS) Russian patent published in 2009 - IPC E21B4/20 E21B7/24 

FIELD: oil and gas production.

SUBSTANCE: group of inventions refers to drilling, particularly to versions of percussion-rotary facility for implementing it for well drilling. The percussion-rotary facility consists of a case designed to be assembled on a support element, and of a volume engine with a stator a rotor; during operation the rotor oscillates and travels in cross direction inside the stator; further, the facility consists of a valve including the first oscillating valve element and the second immobile valve element. Each valve element creates a valve opening and has the main lengthwise axis; the first valve element is connected to the rotor and is designed to travel relative to the second valve element. During operation the valve elements interact, together creating variable flow section through the valve. According to the first version at least one of openings of the valve elements is set off relative to the corresponding main lengthwise axis. According to the second version at least one of the valve elements is set off from the corresponding main lengthwise axis.

EFFECT: facilitating increased pulsation of pressure for specified pressure drop via percussion-rotary facility.

28 cl, 6 dwg