Patent ID: 6533045
Filing Date: 2003-03-18
Classification: E21B

Abstract:
A portable drilling rig comprising:a mast constructed of a single I-beam, said mast pivotally secured to a frame so the mast can be pivoted between a horizontal position relative to the frame and a vertical position relative to the frame, said frame removably attached to a truck bed, a swivel movably secured to said mast so that the swivel moves parallel to said mast, a pair of chain drives functionally attached to said swivel, one of the pair of chain drives provided on either side of the I-beam, each of the pair of chain drives extending the length of the I-beam, a drive motor engaging each said chain drive as a means of moving the chain drive and said swivel relative to the mast, said swivel pivotally attached to said mast so said swivel can be pivoted out of parallel alignment with the mast and back into parallel alignment with the mast, a drive shaft extending through said swivel, a lower end of said drive shaft provided with threads for removably engaging threads on segments of pipe that collectively form a pipe drill string, and means for rotating said drive shaft provided on the top of said swivel in order to rotate the attached pipe drill string and a drill bit that is attached at a lower end of the pipe drill string, an inlet opening provided on the side of the swivel for admitting fluid to the interior of the swivel, and sides of said drive shaft being provided with inlet holes extending therethrough to allow fluid to enter the drive shaft from the interior of the swivel.