Casing drive apparatus

Details Casing drive apparatus Casing drive apparatus

1995-02-14

1996-04-02

Tsay, Frank S.

Wells

Means anchored against rotation in one conduit section for...

166181, 166 2426, 175321, E21B 2303

Patent

active

055032249

ABSTRACT:
There is a need for a device for driving plastic casing into a water well, or for removing such casing from the well without damaging the casing. This need is met by a casing drive apparatus which includes a shoe for attachment to the bottom end of a plastic well casing, an annular groove defining a pair of shoulders in the sleeve, a drive sub for insertion into the sleeve, a plurality of dogs pivotally mounted in the drive sub for engaging the shoulders, and helical springs for biasing the dogs outwardly into engagement with the shoulders, whereby, when the sub is slid into the sleeve and the dogs engage the shoulders, vertical force exerted on the sub results in movement of the dogs against the shoulders to effect vertical movement of the sleeve and consequently of the well casing.

REFERENCES:
patent: 1908217 (1933-05-01), Blumenthal
patent: 3005504 (1961-10-01), Mayhew, Jr.
patent: 3190378 (1965-06-01), Davey, Sr. et al.
patent: 3390730 (1968-07-01), Techy et al.
patent: 3682260 (1972-08-01), Klemm
patent: 3835943 (1974-09-01), Bray
patent: 3901331 (1975-08-01), Djurovic
patent: 4387776 (1983-06-01), Adcock
patent: 4415047 (1983-11-01), Adcock

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