The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 11, 2022
Filed:
May. 03, 2018
Ardyne Holdings Limited, Aberdeen, GB;
ARDYNE HOLDING LIMITED, Aberdeen, GB;
Abstract
A method and apparatus for casing recovery for well abandonment. A string is run-in, the string including a hydraulic jack (), an anchor (), a casing spear (), a downhole flow pulsing device () and a pressure drop sub (). The casing spear grips an upper end of the length of casing to be pulled. The anchor is set in casing of a greater diameter above the length of cut casing. Fluid pumped through the string and through the pressure drop sub will increase fluid pressure at the hydraulic jack to a first fluid pressure (). Fluid pumped through the downhole flow pulsing device will vary the fluid flow superimposing a cyclic pressure () on the first pressure (), causing oscillation of an inner mandrel () of the hydraulic jack. The jack moves the oscillating inner mandrel upwards relative to the anchor to pull the length of casing.