Wells – Processes – Placing or shifting well part
Patent
1996-02-29
1998-03-24
Dang, Hoang C.
Wells
Processes
Placing or shifting well part
166 50, 1661776, 1663324, E21B 2314, E21B 3414
Patent
active
057302243
ABSTRACT:
The present invention provides a subterranean structure for controlling tool access to a lateral wellbore extending from a wellbore. The subterranean structure comprises a bushing that is located in the wellbore and proximate an opening to the lateral wellbore and that has an access window therethrough for allowing access by a tool to the lateral well through the opening. The bushing further has a slidable access control device coaxially coupled thereto. Also included is a shifter that is engagable with the slidable access control device to cause the slidable access control device to slide between an open position wherein a tool is allowed to pass through the window and the opening and into the lateral wellbore and a closed position wherein the tool is prevented from passing through the window and the opening and into the lateral wellbore. The present invention also provides a method of controlling tool access to a lateral wellbore extending from a wellbore. The preferred method comprises the steps of: 1)locating a bushing in the wellbore proximate an opening to the lateral wellbore, the bushing having an access window therethrough for allowing access by a tool to the lateral wellbore through the opening, the bushing further having a slidable access control device coaxially coupled thereto; 2)engaging the slidable access control device with a shifter to slide the slidable access control device with respect to the bushing; and 3) sliding the slidable access control device between an open position wherein a tool is allowed to pass through the window and the opening and into the lateral wellbore and a closed position wherein the tool is prevented from passing through the window and the opening mad into the lateral wellbore.
REFERENCES:
patent: 3073392 (1963-01-01), Dinning et al.
patent: 4928772 (1990-05-01), Hopmann
patent: 5090481 (1992-02-01), Pleasants et al.
patent: 5355953 (1994-10-01), Shy et al.
patent: 5390742 (1995-02-01), Dines et al.
patent: 5479989 (1996-01-01), Shy et al.
Collins Dan R.
Williamson Jimmie R.
Dang Hoang C.
Halliburton Energy Service,s Inc.
Herman Paul I.
Imwalle William M.
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