EP 0136146 A3 19880120 - ANNULUS PRESSURE RESPONSIVE DOWNHOLE TOOL
Title (en)
ANNULUS PRESSURE RESPONSIVE DOWNHOLE TOOL
Publication
Application
Priority
- US 53370183 A 19830919
- US 53383483 A 19830919
- US 53383583 A 19830919
- US 53390183 A 19830919
Abstract (en)
[origin: EP0136146A2] An annulus pressure responsive downhole tool includes a housing (54) having a power piston (140) slidably disposed therein. First (160) and second (166) pressure conducting passages communicate a well annulus (142) with first (142) and second (144) sides of the power piston. A retarding device (244) is disposed in the second pressure conducting passage for delaying communication of a sufficient portion of an increase in well annulus pressure to the second side of the power piston for a sufficient time to allow a pressure differential across the power piston to move the power piston from a first position to a second position relative to the housing. A pressure relief means (272) is communicated with the second pressure conducting passage between the power piston and the retarding device for relieving from the second pressure conducting passage a volume of fluid sufficient to permit the power piston to travel to its second position.
IPC 1-7
IPC 8 full level
E21B 23/00 (2006.01); E21B 34/10 (2006.01); E21B 49/00 (2006.01); E21B 34/00 (2006.01)
CPC (source: EP)
E21B 23/006 (2013.01); E21B 34/108 (2013.01); E21B 49/001 (2013.01); E21B 2200/04 (2020.05)
Citation (search report)
- [AD] US 4113012 A 19780912 - EVANS ROBERT T, et al
- [A] US 3858649 A 19750107 - WRAY GARY Q, et al
- [A] US 4109725 A 19780829 - WILLIAMSON JIM R, et al
Designated contracting state (EPC)
DE FR GB IT NL
DOCDB simple family (publication)
EP 0136146 A2 19850403; EP 0136146 A3 19880120; EP 0136146 B1 19900404; DE 3481855 D1 19900510; SG 55790 G 19900907
DOCDB simple family (application)
EP 84306365 A 19840918; DE 3481855 T 19840918; SG 55790 A 19900717