One-trip window milling apparatus & method with...

Details One-trip window milling apparatus & method with... One-trip window milling apparatus & method with...

E - Fixed Constructions

21

B

E21B 29/06 (2006.01) B09C 1/08 (2006.01) E21B 7/06 (2006.01) E21B 7/08 (2006.01) E21B 21/10 (2006.01) E21B 34/10 (2006.01)

Patent

CA 2297136

A one-trip apparatus and method involves a bypass valve operated in conjunction with an MWD tool in a bottomhole assembly. The milling system for the window, the whipstock, and the anchor are run in together with the bypass valve and MWD tool. The whipstock is oriented using the MWD tool with circulation through the bypass valve. The bypass valve Is actuated to close and locks closed to allow subsequent setting of the packer or bridge plug once the whipstock has been properly oriented. The mills are supported to the whipstock between a pair of lugs and rotationally locked to one of the lugs. Pressure at a predetermined level releases the rotational lock and mere rotation of the mills allows for formation of the window as the lower lug is milled away. The mills are held to the whipstock with pins through the blocks which are capable of handling greater shear loads than shear pins which have in the past been used to secure the mills to the whipstock.

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