Boring or penetrating the earth – With signaling – indicating – testing or measuring – Tool position direction or inclination measuring or...
Patent
1989-01-11
1991-07-30
Britts, Ramon S.
Boring or penetrating the earth
With signaling, indicating, testing or measuring
Tool position direction or inclination measuring or...
175 48, 175 61, 175 75, 175 76, E21B 4702
Patent
active
050352920
ABSTRACT:
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 longitudinal 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 starter 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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Bailey Thomas F.
Campbell John E.
Kagler, Jr. Edmond
Britts Ramon S.
MASX Energy Service Group, Inc.
Schoeppel Roger J.
Sutherland Malcolm L.
Zarins Edgar A.
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