Patent ID: 8443902
Filing Date: 2013-05-21
Classification: E21B,Y10T

Abstract:
1. A time-controlled release device for wireline conveyed tools comprising: an outer housing; a disconnect housing releasably coupled to a distal end of the outer housing; a mandrel extending longitudinally within the outer housing and the disconnect housing; a locking collet and a trigger sleeve disposed about the mandrel at a first location; a first biasing spring disposed within the outer housing between the locking collet and a first shoulder of the outer housing; a release collet forming a portion of the outer housing at the distal end; a disconnect release sleeve mounted on and surrounding the mandrel, wherein the release collet has a first position coupling the outer housing and the disconnect housing and a second position allowing the outer housing to decouple from the disconnect housing; a second spring disposed within the outer housing between a second shoulder of the outer housing and a pressure piston disposed within the outer housing; wherein the pressure piston is mounted on the mandrel between the second spring and a shoulder of the mandrel, the piston having a metering orifice therethrough, whereby when a given load is exceeded on the line, the locking collet is disengaged and upon further increase in load, the release collet is activated after a predetermined period of time dependent upon the flow resistance of the metering orifice in the piston.