Through-tubing perforating apparatus

Details Through-tubing perforating apparatus Through-tubing perforating apparatus

1988-09-29

1989-07-04

Dang, Hoang C.

Boring or penetrating the earth

Boring with explosion in inaccessible hole

Firing chamber movable in bore relative to carrier or...

102310, 102321, 166 551, 175 46, E21B 43117, E21B 43118

Patent

active

048441678

ABSTRACT:
A through-tubing perforating apparatus for use in improving wellbore production. A plurality of shaped charges are interconnected by rigid links that each have eyelets to receive the suspension wire. These links, in conjunction with a guide which initially engages and slides along the suspension wire, keep the shaped charges in a substantially uniform orientation generally perpendicular to the sides of the wellbore. Once the apparatus emerges from the production tubing, a releasable latch interconnecting an upper terminal connector to the supporting wire is actuated permitting the charges, under the influence of the rigid links, to slump under their own weight into contact with the casing walls. This provides maximum penetration into the formation upon actuation of the charges. The expended apparatus can be dropped into the bottom of the wellbore with the aid of a sinker bar.

REFERENCES:
patent: 2543814 (1951-03-01), Thompson et al.
patent: 2664158 (1953-12-01), McKean
patent: 2960931 (1960-11-01), Douglass
patent: 2974589 (1961-03-01), Bryan
patent: 3016014 (1962-01-01), Lebourg
patent: 3067679 (1962-12-01), Caldwell et al.

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