Whipstock starter mill with pressure drop tattletale

Details Whipstock starter mill with pressure drop tattletale Whipstock starter mill with pressure drop tattletale

E - Fixed Constructions

21

B

255/7

E21B 7/08 (2006.01) E21B 7/06 (2006.01) E21B 21/10 (2006.01) E21B 29/06 (2006.01) E21B 34/06 (2006.01) E21B 47/09 (2006.01) E21B 47/18 (2006.01)

Patent

CA 2007461

A whipstock mill for milling through the casing wall which incorporates a pressure drop tattletale to signal the operator that the milling operation should be halted. The milling tool includes a longitudnal fluid passageway which communicates with a lateral port formed below the mill blades. A replaceable plug is utilized to initially close the port thereby restricting fluid flow into the well hole. The start- er mill is preferably run into the hole with a whipstock which can be set in the hole using an integral packer. As the mill travels down the set whipstock, a shear block mounted to the whipstock will shear the plug at a predetermined depth of the mill opening the lateral port. The resulting pressure drop within the milling tool signifies that the mill has reached the desired depth. Accordingly, the milling operation can be halted and the mill retrieved to permit further operations through the casing wall.

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