| 摘要 |
FIELD: well drilling and operation, particularly to create perforation slots in casing pipes, cement stone and rock. ^ SUBSTANCE: perforator comprises base, pushing piston arranged inside the body and cutting disc advancing unit formed as rocking arm supported by central axis. The cutting disc is pinned to the first rocking arm lever. The perforator also has sliding support member connected to the second rocking arm lever so that the support member may be displaced out of the body in direction from the cutting disc simultaneously with cutting disc movement to press the cutting disc to production string surface to be cut. ^ EFFECT: increased manufacturability and productivity. ^ 4 cl, 6 dwg |
