Imprint Description

Fault Diagnosis

Fish

Rod

Clear imprint on the center

Fish is upright,use die collar or overshot

Oblique edge on the rim

Fish tilted,use fishing tools with guide shoe or stabilizing function.

Transverse semicircle imprint

Fish laying horizontally,use pulling out shoes

Pipe

Single circle imprint on the center

Pin end fish top,upright,use die collar or overshot

Single circle imprint with breach

Pin end fish top,but with break thread,Pay attention to protecting fish top while fishing

Single circle imprint on the side

Fish tilted,use fishing tools with guide shoe or stabilizing function.

Double circle imprint on the center

Box end fish top,upright,use taper tap or fishing spear

Double circle imprint on the side

Fish tilted,use fishing tools with guide shoe or stabilizing function.

Wire

Rope type imprint on the bottom

Wire on the well bottom,use wire hook

Rope type imprint on the flank

Wire sticks on the well wall,use wire hook

Straight rod circle imprint on the bottom

Electric cable,use wire hook

Small

item

Scattered small imprints

Use fishing tools for small fish

Other

Sand imprint on the bottom

Fish buried by sand,use fishing tools with flushing function or doing sand washing first

Sinking on the center,the edge is blunt without sharp angle

The drilling fluid pierced the impression block, and failed to encounter any fish.