Patent ID: 11913284
Assignee: ALTUS INTERVENTION (TECHNOLOGIES) AS
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E

Claim 5:
6. A method for removing an obstacle in a well tube, the method comprises:
positioning a drilling assembly free end portion on a surface of the obstacle, the drilling assembly forming a longitudinal center axis, the drilling assembly comprising a cutting assembly comprising a hollow support body, said hollow support body comprising a frustoconical portion forming a tapered drilling assembly free end portion, and a drill bit comprising a tip and helical flutes; the drill bit and the cutting assembly being fastened to a rotatable spline drive assembly, and a house forming an internal wall, and a spline shaft with a support that extends from the spline shaft and slidably abuts the internal wall; the cutting assembly being resiliently displaceable to the drill bit along the center axis such that in a first position the drill bit is surrounded by the cutting assembly, and in a second position a free end portion of the drill bit projects beyond the cutting assembly along the center axis; the cutting assembly comprises tapered endmill, said tapered endmill comprises a central cylindrical through hole formed with an internal diameter adapted to the outer surface of the drill bit, the drill bit tip is surrounded by the cylindrical through hole in the first position;
positioning the tapered endmill on the surface of the obstacle, said tapered endmill being resiliently displaceable along a center axis to the drill bit, such that the tapered endmill rests on the surface by a force created by a resilient member;
drilling a hole in the obstacle by the drill bit, said drill bit creates flutes of swarf;
cutting the flutes of swarf with the tapered endmill into particles which are less than the flutes of swarf; and
drilling through the obstacle, and thereafter increasing weight on the tapered endmill to cut through the obstacle with the tapered endmill.