DEVICE FOR SEALING CASING STRING

摘要

FIELD: oil and gas production. ^ SUBSTANCE: proposed device comprises tube to be assembled of separate sections with attached top and bottom holders accommodating top and bottom reamers interacting with hydraulic landing tool and provided resilient seals arranged there outside. Landing tool allows passing through tube and expanded holders to interact with bottom reamer by cylinder. Landing tool hollow rod is connected with service string via hollow rod extending inside the device. Lower grip is arranged on said hollow rod for limited displacement to interact with tube above aforesaid holder. Top grip is rigidly fixed at a definite distance abode landing tool and features outer size smaller than top reamer axial channel. Thrust is fitted on top holder upper end and secured thereto to allow being broken off upward by preset load. ^ EFFECT: higher reliability, expanded performances. ^ 3 dwg