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:
Aug. 15, 1989
Filed:
Dec. 16, 1987
Bernard H Van Bilderbeek, Aberdeen, GB;
Ian F Milne, Aberdeenshire, GB;
Plexus Ocean Systems Limited, , GB;
Abstract
An annulus cementing and washout technique and equipment, particularly for use in an offshore oil or gas well. An annulus is formed between an outer casing and a second-outer casing, this annulus being filled with cement up to a predetermined level and washed free of cement above said level. The second-outer casing is fitted with a washout casing section having washports at the predetermined level. The washports are selectively opened and closed by axially moving a hollow sleeve mounted in the washout casing section, preferably by turning the sleeve on a screw thread using a remotely operated tool. Details of a suitable tool include spring-loaded radial dogs which engage axial slots within the sleeve. Use of the sleeve and the tool to move the sleeve enables the washports to be opened and closed as required without troublesome rotation or support of the casing.