针对复杂打捞中偏磨油管打捞时易变形、胀破或撕裂的难题，研制出特殊滑牙块打捞矛，打捞矛由上接头、矛杆、滑牙块、锁块、销钉、外筒等组成。
In complicated fishing operation, the tubing is very likely to deform, burst and tear owing to eccentric wear, thereby a kind of fishing spear with sliding cone blocks is developed.
用可退式捞矛或打捞筒打捞油管。
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