| 摘要 |
FIELD: apparatus for obtaining or removing undisturbed cores in tubular core lifter, particularly during vertical, inclined or horizontal well drilling. ^ SUBSTANCE: core holder comprises body, core engagement member and support ring with inclined end surface. Core engagement member is bush with parallel ends and inner inclined surface, which is located on support ring by larger base so that the bush may perform radial, axial and annular movement relative support ring. Angle alpha of cone generator is more or equal to angle beta of end ring surface inclination. Magnet is installed in support ring part characterized by the least height. Core holder has orifice. Magnet and orifice are in common line, which is parallel to axial core holder line. In the case of vertical well drilling the bush is rotated on support ring by gravity force application. In the case of inclined or horizontal well drilling the bush is rotated under the action of magnet and flushing liquid jet to engage core just as washer installed in skewed position on cylindrical body engages the core. ^ EFFECT: increased reliability of core holding during well drilling. ^ 1 dwg |
