E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/42
E21B 34/10 (2006.01) E21B 23/00 (2006.01) E21B 49/00 (2006.01)
Patent
CA 1294214
Abstract Apparatus for retaining axial mandrel movement relative to a cylindrical housing. A cylindrical housing has an open longitudinal passageway therethrough and a circulation port disposed through a wall thereof. A valve mandrel is sli- dably received in the housing and is moveable between a position in which fluid may be circulated only between the passageway and the exterior of the housing, a position in which fluid may be circulated only between the exterior of the housing and the passageway and a position in which fluid may not be circulated in either direction. An annular piston is operatively connected to the valve mandrel and has a first side exposed to the pressure exterior of the housing and a second side exposure to the pressure interior of the housing to permit movement of the valve mandrel to its various positions by application of pressure to the interior and exterior of the housing. A substantially cylindrical spring includes a plurality of elongate fingers disposed about the circumference of a splined mandrel to which the valve mandrel is connected. The spring includes a substan- tially arcuate collar formed about the radially inner sur- face thereof which is engagable with different grooves in the splined mandrel in order to retain the valve mandrel in preselected positions. A pressure differential of a prede- termined value between the annulus and the passageway is required to bow the spring fingers radially outwardly thereby enabling mandrel movement while preventing mandrel movement in response to low pressure pump surges and low pressure differentials generated by movement of the pipe string on which the tool is suspended.
572438
Haliburton Company
Swabey Ogilvy Renault
LandOfFree
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