05465787 is referenced by 41 patents and cites 11 patents.

A fluid circulation apparatus for interconnection with a wellbore tubing string for particular use in drilling deviated wellbores, such as with coiled tubing. The circulation apparatus has a tubular body member with a longitudinal bore extending therethrough and threads for interconnection with a tubing string. A fluid communication port extends through a sidewall of the tubular body member, and a valve is placed thereacross for selectively permitting and preventing fluid flow through the fluid communication port. The valve is biased in a normally closed position by way of a spring. Fluid control means, such as a hydraulic fluid source conveyed through the tubing string, operates the valve in response to electrical signals sent to the fluid control means from the earth's surface.

Title
Fluid circulation apparatus
Application Number
8/282795
Publication Number
5465787
Application Date
July 29, 1994
Publication Date
November 14, 1995
Inventor
Brian A Roth
The Woodlands
TX, US
Assignee
Camco International
TX, US
IPC
E21B 4/04
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