Patent ID: 6202761
Filing Date: 2001-03-20
Classification: E21B

Abstract:
A method for forming a lateral bore hole away from a casing lined original well bore, said method comprising:inserting a window turning shoe with a window milling assembly into the original well bore at a first predetermined directional orientation;milling a window in the casing using said window mill;removing said window milling assembly from the original well bore leaving said window turning shoe in place in the well bore;inserting a guide tool and a mechanical curve drilling assembly into said window turning shoe;latching said guide tool with a second predetermined directional orientation into said window turning shoe;drilling a curved hole away from the original well bore using said curve drilling assembly;removing said guide tool and said curve drilling assembly from said window turning shoe;inserting a conventional drilling apparatus into said original well bore, past said window turning shoe and through said curved hole;drilling a lateral bore hole away from said original well bore using said conventional drilling apparatus.