Wells – Processes – Placing or shifting well part
Patent
1996-11-20
1998-07-07
Tsay, Frank
Wells
Processes
Placing or shifting well part
1661176, E21B 708, E21B 2304
Patent
active
057754284
ABSTRACT:
The invention allows running, in one trip, a packer-setting tool, a whip-stock, and a window-milling system into the wellbore. Between the whipstock and the packer is a packer-setting tool. A flow passage extends through a portion of the whipstock into the setting tool. One or more seals are located between the whipstock and the setting tool if below the packer to be set there are already perforations which could result in fluid losses if they are pressurized. If there are uphole perforations which will cause fluid losses, one or more seals are disposed above the milling string. When both lower and upper seals are used below the whipstock and above the milling string, the zone between the seals is isolated in the wellbore, and pressure goes through the tubing, exits the tubing between the seals, and reenters into the lower end of the whipstock where it communicates with the setting tool for hydraulically setting the packer to support the whipstock. If there are no locations where fluid losses can occur uphole, pressure can be applied through the tubing or the annulus above the whipstock and the pressure communicates through the passage in the whipstock into the setting tool below the whipstock so that the packer can be set for support. When using seals above and below, a one-trip system for squeezing perforations below the packer and milling a window in the casing is enabled.
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Davis Jerry
Lynde Gerald
Baker Hughes Incorporated
Tsay Frank
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