FIELD: oil and gas production.
SUBSTANCE: drilling of oil and gas wells, in particular cleaning of wells from metal fragments. The device includes a housing having a longitudinal axis, and a set of magnets arranged in the form of one or more Halbach arrays for magnets connected to the housing. One or more Halbach magnet arrays have a strong side and a weak side and are located within one or more holders configured to independently hold of this plurality of magnets. Each of the plurality of magnets has a width (W), a height (H) and a length (L), wherein the length (L) of the plurality of magnets is within 10 degrees from the parallel of the longitudinal axis, or the length (L) of the plurality of magnets is within 10 degrees from the perpendicular to the longitudinal axis.
EFFECT: increasing the safety of inserting and removing powerful magnets from the tool.
11 cl, 39 dwg
