Anchor apparatus for a tubing and wireline conveyed method and a

Details Anchor apparatus for a tubing and wireline conveyed method and a Anchor apparatus for a tubing and wireline conveyed method and a

1990-11-20

1992-03-17

Dang, Hoang C.

Wells

Processes

Placing or shifting well part

166217, E21B 2300

Patent

active

050959930

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.

REFERENCES:
patent: 2670797 (1954-03-01), Armentront
patent: 3079177 (1963-02-01), Valvoord et al.
patent: 4349072 (1982-09-01), Escaron et al.
patent: 4488595 (1984-12-01), Akkerman
patent: 4498534 (1985-02-01), Lindsey, Jr.
patent: 4690214 (1987-09-01), Wittrisch

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