Whipstock

Permanent Whipestock

• The permanent whipstock is run in the hole on the bottom of the drill string being attached with a shear pin. Usually, about 30 feet of tail pipe is run below the whipstock to act as an anchor.
• The assembly is run in the hole and landed near bottom.
• The whipstock is then oriented using conventional methods.
• The assembly is landed on bottom and cemented in place.

Retrievable Whipstock

• The retrievable whipstock is run in the hole nearly to bottom.
  The orientation of the whipstock is checked with a single-shot, and the face of the whipstock is oriented in the direction desired.
• The tool is then set on bottom. Depending upon the type of retrievable whipstock, it may be necessary to drop a ball down the drill string in order to divert flow from the bottom of the whipstock to the drilling bit.