E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/1
E21B 47/00 (2006.01) E21B 34/10 (2006.01) E21B 43/25 (2006.01) E21B 47/06 (2006.01) E21B 47/10 (2006.01) E21B 49/08 (2006.01)
Patent
CA 1229040
ABSTRACT There is provided a displacement valve for use in displacing fluid under pressure from the interior to the exterior of a downhole tool, while preventing fluid return thereinto when the pressure is removed. The valve comprises a tubular housing having displacement ports through the wall thereof; a tubular mandrel longitudinally slidably disposed in the housing and having displacement apertures through the wall thereof longitudinally alignable with the dis- placement ports; and a longitudinally slidable check valve disposed in an annular cavity defined between the housing and the mandrel and adapted, when the ports and apertures are aligned, to open communication between the ports and the apertures when the check valve is in one longitudinal position responsive to a pressure inside the mandrel and to move to a second longitudinal position and thereby close the communication and prevent fluid return when the pressure is removed.
528671
Company Halliburton
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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