Patent ID: 6199630
Filing Date: 2001-03-13
Classification: E21B

Abstract:
An apparatus for rotating a tubing string within an oil well, the apparatus comprising:(i) an outer housing having an upper end, a lower end and a generally hollow interior, said lower end having means for attaching said outer housing to the casing bowl of an oil well;(ii) a drive assembly generally disposed within the interior of said outer housing, said drive assembly including a generally hollow rotating gear mandrel and a drive gear; and,(iii) a tubing string hanger disposed within said generally hollow interior of said outer housing, said tubing string hanger having a lower end with means for attaching to and supporting a tubing string, said tubing string hanger further having means to operatively engage said tubing string hanger and said rotating gear mandrel such that rotation of said rotating gear mandrel causes rotation of said tubing string hanger, said means to operatively engage said rotating gear mandrel allowing said tubing string hanger, and a tubing string attached thereto, to be withdrawn from the oil well and through said outer housing without withdrawal of said rotating gear mandrel and said drive gear.