| 摘要 |
FIELD: construction and operation of wells. SUBSTANCE: isolation of flow string is effected by circular packer with sealing member in the form of lead filling the section of tubing-casing annulus under the action of taper bushings which are moved by the weight of tubing string. These taper bushings also function as anchor device. EFFECT: reliable isolation of flow strings of deep oil and gas wells from their strainer part to protect the strings from high bottom hole pressure, high temperature and corrosive media. 1 cl |
