INDUSTRIAL PROBE FOR DETERMINING DEFECTS OF CASING COLUMN AND TUBING PIPES Russian patent published in 2005 - IPC

FIELD: geophysics.

SUBSTANCE: probe has non-magnetic hermetic body and cylindrical base, on which a hollow cylindrical magnetic duct is placed coaxially, with ring polar end pieces, ends of which are made in form of truncated cone with slanting angle of outer surface of end to cylindrical base, equal to 30° and ring polar shelf at middle portion and two generator coils, placed on both sides of ring polar shelf, and enabled oppositely. Probe also has an even number of indicator coils - multi-coil frames without a core, having a parallelogram shape in cross-section with slanting angle of greater side thereof to cylindrical base, calculated from formula. Indicator coils are placed axially and evenly distanced from cylindrical base, re placed evenly along the circle in two rows with maintenance of alignment between the latter and adjacently between each other, are made in two wires with forming of two windings. Upper row of indicator coils is placed above ring polar shelf, lower one - below it. Windings of indicator coils are connected in couples, enabled accordingly and successively. First couple has windings with the least number of coils, and is presented diametrically by opposite windings of indicator coils from different rows, and second - windings with number of coils being in 1.5 times greater and is formed due to connection of identical windings of indicator coils, placed at minimal space from each other, from different rows.

EFFECT: higher efficiency.

2 cl, 5 dwg, 1 ex