FIELD: oil and gas production. SUBSTANCE: apparatus consists of casing enclosing consecutively installed pairs of magnets and magnetic conductor. According to the first version, the latter is common for two pairs of magnets and made in the form of ring. According to the second version, magnetic conductor is made in the form of two coaxially installed rings with diametrically arranged protrusions on their faces, on inner surfaces of which magnets are installed in pairs. Each pair are shifted at 90-279 deg. relative to each other and longitudinal gap between the nearest ends of magnets ranges from 0.1 to 1.5 mm. According to the first version, on outer and/or inner surfaces of rings within the frontiers of installed magnets, transverse notches are made. EFFECT: improved design. 2 cl, 5 dwg, 2 tbl
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Authors
Dates
1997-10-10—Published
1995-06-23—Filed