WHIPSTOCK – REENTRY DRILLING

A whipstock tool is used in earth bores to deflect a drill bit and offset a new hole from the original drill hole, the tool comprising:
  • A thin wedge-shaped body means having an outside surface generally conforming to the shape of the drill hole and an inside tapered surface along which a drill bit can move to guide and deflect the bit for drilling the new offset hole, the body means including a lead end having a generally thin cross-section and an opposite base end having a generally thick cross-section, the outside surface of said wedge-shaped body means having an adhesive means for adhering the body means to the surface of the drill hole.
  • A filler means of deformable, viscous material arranged to complement the wedge-shaped body means and form an elongated cylinder with said body means, said cylinder having a diameter which is slightly less than the diameter of the drill hole.
  • A compression means arranged near the lead end of the body means and in contact with said filler means whereby when said tool is positioned in the well hole and the compression means is moved longitudinally against said filler means, the filler means will be deformed along the inside tapered surface of the body means to fill the void between said body means and the surface of the drill hole so as to place a lateral force against the body means to press the outside surface of the body means and its adhesive means against the surface of the drill hole to permanently set the body means in said drill hole.

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