Downhole magnet, downhole magnetic jetting tool and method of attachment of magnet pieces to the tool body
AssigneeOdfjell Well Services Norway AS
InventorsSimon Leiper, Kevin Robertson
Life of this patent
Estimating the term…
Abstract
A tool for suspending in a well retrieves various metal debris from the well, and includes an elongated tool body with a plurality of magnets included in a plurality longitudinal ridges which are circumferentially spaced. In the method a plurality of magnets can be positioned within openings, recesses, or pockets in each ridge, and held in place by one or more retaining plates, the tool being connected to a drill string and lowered into a well.
Claims21
1-52. (canceled)
A magnet tool for use in removing ferrous material from a wellbore, the tool comprising:
- an elongated tool body, the tool body having
- first and second ends;
- a longitudinal axis;
- and a through bore extending from the first to second end;
- a plurality of circumferentially spaced apart longitudinal ridges with longitudinally extending gaps between each pair of said ridges, each ridge being in the form of a flange projecting radially from the longitudinal axis and
- being aligned with the longitudinal axis, said flange having spaced apart first and second radially extending surface areas and an outer surface spaced away from the longitudinal axis and that extends from the first radially extending surface area to the second radially extending surface area;
- wherein each of the flanges includes
- at least one magnetic element
- detachably mounted in a spaced apart configurations,
- wherein each of said at least one magnetic element is
- detachably held in place by a removable retaining plate,
- the retaining plate having an opening exposing to an exterior surface at least a portion of the at least one magnetic elements and
- wherein the at least one magnetic element extends to at least one said radially extending surface areas and in communication with a said longitudinally extending gap.
A method of cleaning debris in a wellbore comprising the steps of:
- (a) providing a magnet tool comprising:
- an elongated tool body, the tool body having first and second ends;
- a longitudinal axis;
- and a through bore extending from the first to second end;
- a plurality of circumferentially spaced apart longitudinal ridges with a longitudinally extending gap in between each pair of said ridges
- each said ridge projecting radially from the longitudinal axis and being aligned with the longitudinal axis,
- and each of the longitudinal ridges having a pair of opposed longitudinally extending faces
- each of the longitudinally extending faces having longitudinally extending openings opening to at least one of the pair of opposed longitudinally extending faces;
- (b) for each of the plurality of longitudinal ridges inserting at least one magnet through the opening in one of the pair of opposed faces for such ridge;
- (c) for each of the plurality of longitudinal ridges locking in place each of said inserted at least one magnet in its respective longitudinally extending openings by sliding longitudinally in place a locking retainer plate in the longitudinal ridge on the same face that said at least one magnet is inserted in step “b”, each of the locking retainer plate having openings to expose at least part of the outwardly oriented faces of the magnets inserted in step “b”;
- and
- (d) after step “c” inserting the magnet tool into a well bore and collecting debris in said gaps which is magnetically attracted to the magnets of step “b”.
Dependencies are inferred from the claim text.