Hole opener with multisized, replaceable arms and cutters

A hole opener arrangement for enlarging a well bore comprising:

• a tubular body providing at least three longitudinal grooves at spaced intervals around said body,
• a spindle formed on said body adjacent each of said at least three grooves,
• a support arm removably attached to said body disposed in said at least three grooves providing a support spindle,
• a journal retained between said spindle on the body at said journal's proximal end and the support spindle on the attached support arm at said journal's distal end, and
• a cutter body carried on each such journal to provide rotational contact with the bore to be enlarged,
• wherein the body spindle formed on said body in a non-concentric recess in the body whereby the proximal end of the journal seats in said non-concentric recess to prevent rotation around the body spindle.

A hole opener arrangement for enlarging a well bore comprising:

• a tubular body providing at least three longitudinal grooves at spaced intervals around said body,
• a spindle formed on said body adjacent each of said at least three grooves,
• a support arm removably attached to said body disposed in said at least three grooves providing a support spindle,
• a journal retained between said spindle on the body at said journal's proximal end and the support spindle on the attached support arm at said journal's distal end, and
• a cutter body carried on each such journal to provide rotational contact with the bore to be enlarged,
• wherein the body spindle formed on said body is eccentric whereby the journal cannot rotate around the body spindle.

A hole opener comprising:

• a tubular body providing a passageway for communication of fluid and a plurality of longitudinal grooves on the surface of said tubular body,
• cutter journal spindles formed on said tubular body,
• a plurality of removable cutter support arms, each with a support spindle,
• fasteners for said removable cutter support arms on said tubular body,
• cutter journals, each supported on a respective support spindle and cutter journal spindle between each of the cutter support arms and the tubular body, and
• replaceable cutter shells rotatably supported on said cutter journals.

A hole opener comprising:

• a tubular body providing a passageway for communication of fluid and a plurality of longitudinal grooves on the surface of said tubular body,
• cutter journal spindles formed on said tubular body,
• a plurality of removable cutter support arms,
• fasteners for said removable cutter support arms on said tubular body,
• cutter journals supported between each of the cutter support arms and the cutter journal spindles formed on the tubular body, and
• replaceable cutter shells rotatably supported on said cutter journals,
• wherein the cutter support arms have lateral faces, wherein the fasteners are bolts inserted into holes drilled into said lateral faces of each cutter support arm, and are secured by small cap head screws to prevent loss during operation.

A hole opener comprising:

• a tubular body providing a passageway for communication of fluid and a plurality of longitudinal grooves on the surface of said tubular body,
• cutter journal spindles formed on said tubular body,
• a plurality of removable cutter support arms,
• fasteners for said removable cutter support arms on said tubular body,
• cutter journal supported between each of the cutter support arms and the cutter journal spindles formed on the tubular body, and
• replaceable cutter shells rotatably supported on said cutter journals,
• wherein each groove has lateral sides and each cutter support arm has lateral faces, wherein the fasteners are cap head screws connected through passageways formed in the lateral sides of each groove and passing through holes drilled into the lateral faces of each cutter support arm, each cap head screw secured by a small cap head screw to prevent loss during operation.

A hole opener comprising:

• a tubular body providing a passageway through its longitudinal length for communication of fluid,
• threaded connections on each end of the tubular body, not less than three grooves formed on the tubular body, each groove having a first plurality of steps formed therein,
• a stepped cutter support arm having a distal end and a proximal end with a second plurality of steps on one side of the proximal end, the stepped cutter support arm for insertion into each of the not less than three grooves on the tubular body with the first and second plurality of steps positioned in a mating relationship with each other, and providing a support spindle at each distal end of such arm,
• at least one fastener for each stepped cutter support arm to the body,
• not less than three journals each having an interior surface, an interior diameter, a proximal end, a distal end and an external surface, each such journal providing a longitudinal passage on its interior surface and a bearing race on its external surface, and
• a body spindle formed on the tubular body for each groove, wherein each body spindle and support spindle has a diameter substantially equivalent to the interior diameter of each journal, wherein for each journal the respective body spindle supports the proximal end of such journal and the respective support spindle supports the distal end of such journal.