Forming casing window off whipstock set in cement plug

Details Forming casing window off whipstock set in cement plug Forming casing window off whipstock set in cement plug

E - Fixed Constructions

21

B

E21B 29/06 (2006.01) E21B 7/06 (2006.01) E21B 23/00 (2006.01)

Patent

CA 2152638

Methods and systems for forming a window through the wall of a well casing to enable a new borehole to be drilled outside the casing include forming a cement plug in the cas- ing, drilling a laterally offset hole in the cement plug, orienting and setting a whipstock in the offset hole, and using the whipstock to drill an elongated window through the casing wall opposite its deflector surface. The drilling steps employ a mud motor having a bent housing that estab- lishes a toolface for the bit, and proper orientation is obtained by downhole measurement and transmission to the surface of orientation signals and downhole adjustment of orientation to a selected toolface value. The whipstock is oriented in the same manner. All drilling and orientation procedures are carried out on coiled tubing to reduce costs.

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