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1. (WO2001036787) DOWNHOLE VALVE

Pub. No.:    WO/2001/036787    International Application No.:    PCT/US2000/031452
Publication Date: Sat May 26 01:59:59 CEST 2001 International Filing Date: Thu Nov 16 00:59:59 CET 2000
IPC: E21B 23/00
E21B 34/00
E21B 34/10
Inventors: PRINGLE, Ronald, E.
MILLIGAN, Clay, W., Jr.
READ, Dennis, M.
The invention is a downhole valve (100) that includes a body (12), a flow tube assembly (102) that includes an upper tube member (108) and a lower tube member (110), and a flapper valve (10). The flapper valve (10) is pivotally attached to the body (12) and is positioned between the upper tube member (108) and the lower tube member (110) when the flapper valve (10) is in a closed position that blocks fluid flow in an internal bore of the body (12). The flapper valve (10) is moved from the closed position to an open position in response to an upward movement of the upper tube member (108) and the lower tube member (110). When the flapper valve (10) pivots to the open position, the lower tube member (110) moves adjacent to and forms a seal with the upper tube member (108), forming an unobstructed internal bore.