초록 ▼

A method of producing an annular nonuniform groove (106) in the bore wall (104) of a casing (100) and a casing produced thereby is disclosed. The method includes the steps of forming a first portion (164), forming a second portion (172), and forming a third portion of an annular nonuniform groove. T

A method of producing an annular nonuniform groove (106) in the bore wall (104) of a casing (100) and a casing produced thereby is disclosed. The method includes the steps of forming a first portion (164), forming a second portion (172), and forming a third portion of an annular nonuniform groove. The first portion is formed by a first milling tool (168). The first portion defines a starting point (108) as the radial furthest point on the radially outer surface of the first portion. The first portion also defines a first intermediate point (166) as the radially closest point on the radial outer surface of the first portion. The second portion (172) is formed by a second milling tool (174, 180). The second portion is defined along the annular radial outer side wall from the first intermediate point to a second intermediate point (178). The second intermediate point (178) is defined as the radial closest point on the annular radially outer side wall of the second portion. The third portion (196) is formed by a third milling tool (194). The third portion (196) extends along the annular radial outer side wall of the annular nonuniform groove from the second intermediate point (178) to an ending point (110).

대표청구항 ▼

[ That which I claim:] [1.] A method of forming a circumferentially extending nonuniform groove in an annular wall of a bore in a casing, said bore having a longitudinal axis, said nonuniform groove having, with respect to said longitudinal axis, an annular radial outer side wall, an annular axial u

[ That which I claim:] [1.] A method of forming a circumferentially extending nonuniform groove in an annular wall of a bore in a casing, said bore having a longitudinal axis, said nonuniform groove having, with respect to said longitudinal axis, an annular radial outer side wall, an annular axial upper side wall, and an annular axial lower side wall, said method comprising the steps of:contacting said annular wall with a first milling tool having a longitudinal axis;rotating said first milling tool about the longitudinal axis of said first milling tool;asserting said first milling tool radially into said bore wall to form a first portion of said annular nonuniform groove, said first portion defining a starting point as the radially furthest point on the radial outer surface of said first portion and defining a first intermediate point as the radially closest point of the radial outer surface of said first portion;contacting a second milling tool having a longitudinal axis to said bore wall at a point immediately adjacent said first intermediate point;rotating said second milling tool about said longitudinal axis of said second milling tool;asserting said second milling tool into said bore wall to form a second portion of said annular nonuniform groove, said second portion being defined along said annular radial outer side wall from said first intermediate point to a second intermediate point, said second intermediate point being defined as the radially closest point on said annular radial outer side wall of said second portion;contacting a third milling tool having a longitudinal axis to said bore wall at a point immediately adjacent to said second intermediate point;rotating said third milling tool about said longitudinal axis of said third milling tool; and,asserting said third milling tool into said bore wall to form a third portion of said annular nonuniform groove, said third portion extending along said annular radial outer side wall of said annular nonuniform groove from said second intermediate point to an ending point.