Patent ID: 8312939
Filing Date: 2012-11-20
Classification: E21B

Abstract:
1. A method for facilitating horizontal drilling through a well casing into a subterranean, the method comprising steps of: positioning in said well casing a shoe defining a passageway extending from an upper opening in said shoe through said shoe to a side opening in said shoe; inserting a rod and casing mill assembly into said well casing and through said passageway in said shoe until a casing mill end of said casing mill assembly substantially abuts said well casing; rotating said rod and casing mill assembly until said casing mill end substantially forms a perforation in said well casing; attaching a housing of an internally rotating nozzle to an end of a hose for facilitating fluid communication between said hose and an interior portion of said housing, said housing defining a gauge ring extending from an end thereof opposite said hose, said gauge ring having an outside diameter larger than an outside diameter of a first section of said housing, said first section of said housing being interposed between said hose and said gauge ring, said gauge ring having an outside diameter larger than an outside diameter of a first section of said housing, said first section of said housing being interposed between said hose and said gauge ring, said internally rotating nozzle including a rotor rotatably mounted within said housing so that said entire rotor is contained within said interior portion of said housing, said rotor including at least two tangential jets recessed within said gauge ring and oriented off-center to generate torque to rotate said rotor, said rotor further defining passageways for providing fluid communication between said interior portion of said housing and said jets; applying force to push said internally rotating nozzle attached to the end of said hose through said passageway and said perforation into said subterranean and to urge said gauge ring against said subterranean formation; and ejecting fluid from said at least two tangential jets into said subterranean formation for impinging upon and eroding said subterranean formation.