Mechanically actuated whipstock assembly

Boring or penetrating the earth – Processes – Boring curved or redirected bores

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Details

1661176, 175 73, E21B 708

Patent

active

046933271

ABSTRACT:
Structure is passed into an earth well including a whipstock attached to piping and a retractible anchor. The whipstock includes a number of connected guide assemblies. Erection means is connected at one end to a forward guide assembly and at the other end to an extension projecting to the earth surface. To erect the whipstock, an extension of the erection means is pulled from the surface to cause the guide assemblies to swing into a curved pathway. Thereafter, a drilling tube is passed through the whipstock into the adjacent formation. The whipstock may be deerected by releasing the extension means. Then, the anchor is released and the structure is pulled out of the well.

REFERENCES:
patent: 1367042 (1921-02-01), Granville
patent: 3640344 (1972-02-01), Brandon

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