One trip through tubing window milling apparatus and method
OwnerJeffrey E. Toulouse, Malcolm D. Pitmaninventors
Life of this patent
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Abstract
A one-trip through tubing window milling system is disclosed. The whipstock is delivered with the mill and downhole motor in a downhole assembly which further includes MWD equipment for proper whipstock orientation. The entire assembly is run through tubing and the MWD equipment orients the whipstock. A motor lock prevents the downhole motor from turning as fluid pressure is applied to properly anchor the whipstock below the production tubing. The motor lock is defeated and the milling commenced using the downhole motor. At the conclusion of the window milling, the bottom hole assembly, including the mill, is removed and a retrieving tool releases the whipstock for retrieval through the production tubing.
Claims23
A method of window milling comprising:
- connecting a mill to a whipstock;
- running said mill and whipstock together through well tubing and out of the lower end of said well tubing;
- anchoring the whipstock in a larger tubular below said well tubing;
- milling the window.
An anchor system for a through well tubing whipstock comprising:
- a whipstock;
- a gripping member connected to said whipstock and selectively pivotally moveable between a retracted position, allowing said whipstock to be advanced through tubing and a gripping position where the whipstock is anchored below the tubing through which it was delivered;
- a fluid powered actuator for selective pivoting of said gripping member into said gripping position below said well tubing.
A lock for a downhole fluid driven motor comprising:
- a motor housing;
- a rotor mounted in said motor housing;
- a releasable lock preventing rotation of said rotor, said lock releasable after said motor housing is delivered downhole.
Dependencies are inferred from the claim text.