Wells – Processes – Perforating – weakening – bending or separating pipe at an...
Patent
1989-12-15
1991-06-25
Dang, Hoang C.
Wells
Processes
Perforating, weakening, bending or separating pipe at an...
166 551, 166217, E21B 43116
Patent
active
050258613
ABSTRACT:
A new method of standalone perforating comprises the steps of lowering a perforator part-way into a borehole on a tubing string; when perforating is desired, connecting a wireline to the perforator; disconnecting the perforator from the tubing string; lowering the perforator into the borehole to the desired depth; attaching the perforator to the borehole casing or formation by setting an anchor on the perforator; disconnecting all wireline and associated apparatus from the perforator; withdrawing the wireline apparatus to the well surface; with the perforator standing alone in the well, firing the perforator into the surrounding formation; and dropping the perforator to the bottom of the well. A new apparatus for releasing the perforator from the tubing string includes a neutral release latch mechanism, and a new anchoring apparatus includes two interleaved coil springs having beveled shaped surfaces. Compression of an inner coil spring forces a radial expansion of an outer slip coil spring until the slip coil spring contacts the borehold wall and sets the anchor.
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"Perforating Damage: Here's One Field Tested Solution", Brieger et al, World Oil, Nov. 1976, 4 pages.
SPE 7009, "A Completion Technique for Overcoming Formation Damage".
Edwards Arnold G.
Hromas Joe C.
Huber Klaus B.
Bouchard John H.
Dang Hoang C.
Garrana Henry N.
Schlumberger Technology Corporation
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