Wells – Processes – Disassembling well part
Patent
1990-11-20
1991-09-24
Dang, Hoang C.
Wells
Processes
Disassembling well part
166217, 166237, 166382, 166385, E21B 2302, E21B 2300
Patent
active
050506820
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 borehole wall and sets the anchor.
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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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