Patent ID: 6915853

Claim:
A tool for perforation of a longitudinal wall section of a pipe ( 26 ) in a production zone of a hydrocarbon-producing well and loosening/perforating externally located sedimentary rock ( 80 ), wherein a tool ( 10 ) is used, which is arranged to be lowered into the well and hauled up there from, said tool ( 10 ) comprising an elongated tool housing ( 10 a ) of sleeve-shaped/tubular configuration along the major part of its length, wherein is enclosed at least one drilling means ( 28 ) and at least one jetting means ( 42 ) and a supporting holding-up means ( 32 ), the tool housing ( 10 a ) being formed with a radial transverse opening for each means ( 28 , 42 , 32 ), and where to the said drilling means ( 28 ) is arranged a driving motor ( 30 ) for the supply of rotary energy required during drilling, and a driven, controlled moving mechanism ( 56 , 58 , 60 , 76 , 78 ) for moving the drilling means ( 28 ) between an inactive stand-by position within the outer mantle surface of the tool housing ( 10 a ), and an active drilling position, in which it is arranged, by activation of the driving motor ( 30 ), to drill its way through an adjacent pipe wall ( 26 ), and said jetting means ( 42 ) has the form of an elastically flexible jetting hose with an outer propulsion head in the form of a nozzle head ( 42 a ) with pressure liquid supply, said jetting hose ( 42 ) having a feeding device ( 96 ) and guides/control means ( 82 , 102 ) arranged thereto, for moving the jetting hose ( 42 ) and transferring same from an inactive stand-by position within the outer wall of the tool housing ( 10 a ) into a moving position, in which it is moved radially outwards from the tool housing ( 10 a ), first through a hole ( 40 ) of the pipe wall ( 26 ) that the drilling means ( 28 ) has drilled, and then into the sediment ( 80 ) surrounding the pipe ( 26 ), characterized in that the drilling means ( 28 ) has a coaxial shaft ( 28 a ), which opposite the drilling means 28 , which is positioned at a radially outer end, is connected to a link arm system ( 56 , 58 , 60 ) driven by an axially reciprocating piston device ( 76 , 78 ) in order to provide—by the axially reciprocating displacing motion of a piston ( 76 ) in a cylinder ( 78 ) which is formed in the tool housing ( 10 a ) and has a longitudinal axis that coincides with the axis of the tool housing—a controlled transfer of the drilling means ( 28 ) between its active position and its inactive position and vice versa.