Oil pipe prevents top mounted putting

The utility model relates to a stifled technical field, in particular to oil pipe prevents top mounted putting are separated to the oil well. The device's the inside interior circular bead that can restrict buffering jam sliding sleeve and go upward that is equipped with of two flange controller lower extremes, prevent that a blanking plug includes the center tube, the spacing ring is connected to the center tube upper end, the lower clutch is connected to the center tube lower extreme, the cover is equipped with the buffering and stops up the sliding sleeve on the center tube, it is spacing through the spacing ring that the sliding sleeve upper end is blockked up to the buffering, it is inboard sealed through sealing washer and center tube that the sliding sleeve upper end is blockked up to the buffering, the buffering is blockked up the sliding sleeve outside and is also installed the sealing washer, install buffer spring in the annular space between buffering jam sliding sleeve lower part and the center tube, buffer spring upper end top step department in the sliding sleeve is blockked up to the buffering, buffer spring lower extreme top is on the lower clutch up end. The utility model discloses a push up on the negative pressure suction is separated stifled in -process, is prevented the oil pipe accident, effectively prevent the emergence of blowout accident, improve the security of separating stifled technology work progress.