EP 3833846 A1 20210616 - CENTRALIZER HAVING ATMOSPHERIC CHAMBER FOR EXPANSION IN RESPONSE TO HYDROSTATIC PRESSURE
Title (en)
CENTRALIZER HAVING ATMOSPHERIC CHAMBER FOR EXPANSION IN RESPONSE TO HYDROSTATIC PRESSURE
Title (de)
ZENTRALISIERER MIT ATMOSPHÄRISCHER KAMMER ZUR EXPANSION ALS REAKTION AUF HYDROSTATISCHEN DRUCK
Title (fr)
CENTREUR AYANT UNE CHAMBRE ATMOSPHÉRIQUE PERMETTANT UNE EXPANSION EN RÉPONSE À UNE PRESSION HYDROSTATIQUE
Publication
Application
Priority
- US 201862717324 P 20180810
- IB 2019056329 W 20190724
Abstract (en)
[origin: WO2020031010A1] A centralizer for use in a wellbore includes: a body for disposing around a periphery of a casing or liner string, the body having a plurality of bow springs biased toward an expanded position; a mandrel for disposing around the periphery of the casing or liner string; a piston disposed around the mandrel and movable between a locked position and a release position; a plurality of dogs, each dog mounted to or formed integrally with the respective bow spring and captured by the piston in the locked position, thereby keeping the bow springs in a retracted position; an atmospheric chamber formed between the piston and the mandrel; and a fastener for releasably connecting the piston to the mandrel in the locked position.
IPC 8 full level
E21B 17/10 (2006.01)
CPC (source: EP US)
E21B 17/1028 (2013.01 - EP US)
Citation (search report)
See references of WO 2020031010A1
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
DOCDB simple family (publication)
WO 2020031010 A1 20200213; CN 112534115 A 20210319; EA 202190187 A1 20210721; EP 3833846 A1 20210616; US 2021270092 A1 20210902
DOCDB simple family (application)
IB 2019056329 W 20190724; CN 201980051276 A 20190724; EA 202190187 A 20190724; EP 19773521 A 20190724; US 201917259643 A 20190724