THROUGH-TUBING RETRIEVABLE WHIPSTOCK SYSTEM

摘要

A whipstock system for insertion into an earth wellbore through a first tubular into a second tubular and for selectively setting within the second tubular. The first tubular has a smaller internal diameter than the second tubular and the first tubular is disposed above the second tubular. The second tubular has an interior surface, and the whipstock system comprises a concave (10), anchor apparatus (20) connected to and below the concave (10), grip apparatus (30) movably disposed within the anchor apparatus, pushing apparatus (60, 70, 80) below the grip apparatus (30) for pushing the grip apparatus (30) upwardly and outwardly from the anchor apparatus (20) for contacting the interior surface of the second tubular to set the whipstock system therein, and fluid flow apparatus (13, 22, 23) for conducting fluid under pressure through the concave (10) and through the anchor apparatus (20) to push up on the pushing apparatus (60, 70, 80).