Wells – Brushing – scraping – cutting or punching-type cleaners – Retractable on support while lowering
Reexamination Certificate
2011-01-18
2011-01-18
Neuder, William P (Department: 3672)
Wells
Brushing, scraping, cutting or punching-type cleaners
Retractable on support while lowering
C166S172000, C166S173000
Reexamination Certificate
active
07870897
ABSTRACT:
A cleaning tool for cleaning a liner top in a well bore. The tool includes cleaning elements, typically scrapers, which are arranged eccentrically to an axial bore through the tool. The elements are biased outwardly to contact an inner surface of a polished bore receptacle (PBR) at a position with a curvature to match the PBR and to present leading edges of each element when positioned at a surface of a neighbouring casing. The tool may further provide a top dress mill and act as a packer actuator sub. This provides a tool which performs a number of functions on a single trip in a well bore.
REFERENCES:
patent: 2275939 (1942-03-01), Baker
patent: 4648447 (1987-03-01), Bishop et al.
patent: 2005/0028982 (2005-02-01), Howlett et al.
Hutchins Cathleen R
Neuder William P
Osha & Liang LLP
Specialised Petroleum Services Group Limited
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