Mechanically opened ball seat and expandable ball seat

Details Mechanically opened ball seat and expandable ball seat Mechanically opened ball seat and expandable ball seat

2005-03-15

2005-03-15

Tsay, Frank (Department: 3672)

Wells

Valves, closures or changeable restrictors

C166S373000, C166S166000, C166S319000

Reexamination Certificate

active

06866100

ABSTRACT:
A method and apparatus for obstructing the passage of fluid within a fluid flow conduit and subsequently reconfiguring the tool to allow substantially full-bore passage therethrough. Pressure developed upstream of the obstruction can be utilized to operate pressure actuated tools such as liner hangers. Equipment used in subsequent wellbore operations such as drill pipe darts can pass undamaged through the opened port. In an embodiment, the flow through a tubular is obstructed by placing a ball on an expandable ball seat, developing a pressure differential across the ball seat, equalizing the pressure after the hydraulically actuated tool completes its function, and mechanically manipulating the drill string to open the expandable ball seat and allow the ball to pass through.

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U.K. Search Report, Application No. GB 0319806.6, dated Feb. 18, 2004.

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