E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/4
E21B 43/12 (2006.01) E21B 34/04 (2006.01) E21B 34/12 (2006.01) E21B 34/00 (2006.01)
Patent
CA 1104922
TITLE: TUBING MANIPULATED TEST VALVE AND LATCH ASSEMBLY ABSTRACT OF T E INVENTION A test valve assembly is provided which is adapted to be lowered on a tubular string between upper and lower tubular sections into position within a blowout preventer stack at the upper end of a well bore of a subterranean oil or gas well. The apparatus has first and second fluid flow passageways within a housing. A valve member is disposed between the flow passageways and is shiftable to open position to communicate the flow passage- ways during selective incremental testing of the well and is manipulatable to closed position to isolate the flow passages prior to and subsequent to selective incremental testing of the well. Means are provided which are responsive to mechanical manipulation of the tubular string for shifting of the valve member between closed and open positions. The apparatus and the tubular string may be selectively latched with respect to one another without manipulation of the valve member between closed and open positions. Clutch means are provided whereby the upper tubular section may be selectively rotationally engaged with the lower tubular section during testing of the well and when the valve member is in open position. Auxiliary hydraulically acti- vated valve manipulation and unlatching means also are provided.
335454
Borden Ladner Gervais Llp
Lynes Inc.
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