One-trip window milling apparatus and method with measurement while drilling

摘要

A one trip apparatus and method involves a bypass valve 22 operated in conjunction with an MWD tool in a bottomhole assembly. The milling system 14 for the window, the whipstock 10, and the anchor are run in together with the bypass valve 22 and MWD tool. The whipstock 10 is oriented using the MWD tool with circulation through the bypass valve 22. The bypass valve 22 is actuated to close and lock to allow subsequent setting of the packer or bridge plug once the whipstock 10 has been properly orientated. The bypass valve 22 is movably responsive to fluid flow in a first direction and in an opposite second direction under a biasing force preferably a spring 46. The milling system is supported to the whipstock between a pair of blocks 106, Fig 2b and the mere rotation of the mills allows for formation of the window as the lower block 106 is milled away. The milling system 14 is held to the whipstock 10 with pins 146, Fig 3a through blocks. The pins 146 are capable of handling greater shear loads than shear pins which have in the past been used to secure the mills to the whipstock.