Downhole magnet, downhole magnetic jetting tool and method of attachment of magnet pieces to the tool body

摘要

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.

主权项

1. 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
a plurality of magnetic elements detachably mounted in spaced apart configurations, wherein the plurality of magnetic elements are 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 plurality of magnetic elements; andwherein each magnetic element extends to at least one said radially extending surface areas and in communication with a said longitudinally extending gap.