| 摘要 |
FIELD: oil production industry, particularly well repair equipment. ^ SUBSTANCE: device comprises a number of hollow cylindrical housings with fixing members installed thereon. Each fixing member has rams, ram holder and centralizer. Each next downstream housing is offset relative upstream one in horizontal plane for angle determined as alpha=120/n, where alpha is the angle, deg., n is number of housings with fixing members. The housings are connected one to another by threaded connection and are restricted from spontaneous detachment by screws. ^ EFFECT: increased engaging and retaining reliability of pipe to be fished during extraction thereof from well, reduced mounting and maintenance costs. ^ 3 dwg |
