Patent ID: 11867014
Assignee: ALTUS INTERVENTION (TECHNOLOGIES) AS
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E

Claim 9:
10. A method for drilling a passage in an object within a petroleum well, the method comprises:
providing a drilling assembly forming a longitudinal center axis; the drilling assembly comprises: a drill bit assembly comprising a drill bit at a free end of the drill bit; a cutting assembly formed by a tubular body having a mouth portion provided with a hole saw assembly, and the cutting assembly being resiliently displaceable to the drill bit assembly along the center axis; a rotatable drive assembly; the drill bit assembly and cutting assembly being fastened to the rotatable drive assembly; a displaceable membrane within the tubular body, the displaceable membrane dividing an interior of the tubular body into a receiving compartment of variable volume and an inner compartment of variable volume, and the displaceable membrane being fastened to one of the rotatable drive assembly and the drill bit assembly;
connecting the drilling assembly to a wireline tractor;
displacing the drilling assembly within the petroleum well by the wireline tractor and positioning the drilling assembly in contact with the object;
engaging the rotatable drive assembly and adding weight on the drill bit assembly such that the spring becomes partly compressed;
making a through hole in the object by the drill bit;
adding further weight on the cutting assembly such that the spring becomes further compressed and cutting out at least one disc from the object; and
displacing the cutting assembly forwardly and relative to the membrane by the biasing force of the compressed spring, thereby evacuating fluid in the inner compartment proximally along the drive shaft and keeping a distance between the membrane and the disc constant by a sub-pressure in the receiving compartment, and thereby the disc follows the membrane in the proximal direction into the receiving compartment.