| 摘要 |
FIELD: oil production industry, particularly to straighten deformed casing pipes in oil and gas wells. ^ SUBSTANCE: device has body with conical forward and backward guiding means and annular slot made on outer surface, rings provided with slots made on surfaces facing each other and serially installed in the annular slot and rollers. Rollers have extensions in upper and lower parts thereof and are arranged in slots of the rings so that rollers may move in radial direction. Outer body surface has radial slots of variable depths defined in cross-sections thereof. Radial slots are adapted to receive rollers and provide roller displacement in radial direction. Rings may rotate relative longitudinal body axis and are connected by plates and form roller rows and windows for rollers. Radial body slots for receiving each upper roller row are formed so that rollers of upper row may be displaced in radial direction for greater distance in comparison with lower rollers. Each roller row may perform independent rotation relative body. Body is provided with process pieces. Several roller rows form expanding units separated one from another by process pieces. ^ EFFECT: increased operational reliability. ^ 4 cl, 3 dwg |
