Wells – Processes – Operating valve – closure – or changeable restrictor in a well
Patent
1991-03-13
1992-07-21
Dang, Hoang C.
Wells
Processes
Operating valve, closure, or changeable restrictor in a well
166152, 166285, 166334, 166386, 251117, E21B 3412, E21B 3313
Patent
active
051314738
ABSTRACT:
An improved tool for controlling the rate of flow of cement into a well to control the consolidation of a formation is disclosed. The tool comprises a housing, an actuator and a valve member, motion of which is controlled by axial motion of the actuator within the housing. In the preferred embodiment, the valve member includes a fixed size choke orifice which controls the flow of cement into the formation. The tool is operated by lowering it into a well with the valve open, fixing the housing to the casing of the well, pumping cement below the valve, lowering the actuator with respect to the housing to close the valve, and pressurizing the well to force the cement into the formation at a rate controlled by the size of the choke orifice.
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Dang Hoang C.
Hager Jr. George W.
McKillop Alexander J.
Mobil Oil Corporation
Speciale Charles J.
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