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1. WO2012068054 - APPARATUS AND METHOD FOR ADJUSTING SPRING PRELOAD IN A DOWNHOLE TOOL

Publication Number WO/2012/068054
Publication Date 24.05.2012
International Application No. PCT/US2011/060712
International Filing Date 15.11.2011
IPC
F16F 1/12 2006.01
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
16ENGINEERING ELEMENTS OR UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
FSPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
1Springs
02made of steel or other material having low internal friction; Wound, torsion, leaf, cup, ring or the like springs, the material of the spring not being relevant
04Wound springs
12Attachments or mountings
E21B 31/113 2006.01
EFIXED CONSTRUCTIONS
21EARTH OR ROCK DRILLING; MINING
BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
31Fishing for or freeing objects in boreholes or wells
107using impact means for releasing stuck parts, e.g. jars
113hydraulically operated
CPC
E21B 31/107
EFIXED CONSTRUCTIONS
21EARTH DRILLING; MINING
BEARTH DRILLING, e.g. DEEP DRILLING
31Fishing for or freeing objects in boreholes or wells
107using impact means for releasing stuck parts, e.g. jars
F16F 1/121
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
FSPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
1Springs
02made of steel or other material having low internal friction
04Wound springs
12Attachments or mountings
121adjustable, e.g. to modify spring characteristics
Applicants
  • NATIONAL OILWELL VARCO, L.P. [US]/[US] (AllExceptUS)
  • SHEEHAN, Mark [CA]/[CA] (UsOnly)
  • PRILL, Jonathan [CA]/[CA] (UsOnly)
  • CLAUSEN, Jeffery [US]/[US] (UsOnly)
Inventors
  • SHEEHAN, Mark
  • PRILL, Jonathan
  • CLAUSEN, Jeffery
Agents
  • WILSON, David, M.
Priority Data
13/295,35014.11.2011US
61/414,25216.11.2010US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) APPARATUS AND METHOD FOR ADJUSTING SPRING PRELOAD IN A DOWNHOLE TOOL
(FR) APPAREIL ET PROCÉDÉ PERMETTANT D'AJUSTER UNE PRÉCHARGE DE RESSORT DANS UN OUTIL D'EXTRACTION
Abstract
(EN)
Apparatus and method for adjusting spring preloading in a downhole tool. In one embodiment, a mechanism includes a nut (116) and a piston (112). The nut is configured to axially compress a spring (104) in the downhole tool (100). The piston is coupled to the nut. Extension of the piston causes the nut to rotate and compress the spring. The nut is configured to maintain compression of the spring after the piston retracts.
(FR)
L'invention concerne un appareil et un procédé permettant d'ajuster une précharge de ressort dans un outil d'extraction. Dans un mode de réalisation, un mécanisme comprend un écrou et un piston. L'écrou est conçu pour comprimer axialement un ressort dans l'outil d'extraction. Le piston est accouplé à l'écrou. L'extension du piston amène l'écrou à pivoter et à comprimer le ressort. L'écrou est conçu pour maintenir la compression du ressort une fois le piston rétracté.
Also published as
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