FIELD: mining.
SUBSTANCE: prior to the start-up of overlapping mechanism it is equipped with bypass mechanism that provides pressure equalisation outside and inside the overlapping mechanism at its lowering with the well flushing, which prevents premature irreversible plastic deformation of shapes of the overlapping mechanism at excess pressure in the overlapping mechanism over critical value. After the overlapping mechanism is lowered to the well installation interval, bypass mechanism is switched off and overlapping mechanism is installed.
EFFECT: improving installation reliability of overlapping mechanism.
4 cl, 10 dwg
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