Wells – Brushing – scraping – cutting or punching-type cleaners
Reexamination Certificate
1999-02-24
2001-05-08
Neuder, William (Department: 3672)
Wells
Brushing, scraping, cutting or punching-type cleaners
C166S173000
Reexamination Certificate
active
06227291
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to tools used for the drilling of oil and gas. The invention particularly relates to a well clean up tool and to its use.
It is considered desirable when drilling for oil or gas to maintain a clean interior in the casing or liner of the well. For this purpose, well cleaning apparatus is well known and comes in a variety of different forms. One such type of well cleaning apparatus is a casing scraper. This type of tool typically incorporates steel casing scraper blades that scrape the inside of the casing or tubing in the well. The steel blades provided with casing scrapers usually are designed to clean the casing interior of relatively large particles or debris, such as lumps of cement, rocks or congealed mud and so on.
A second type of well cleaning apparatus known in the art may be more accurately likened to a brush and incorporates cleaning pads with protruding bristles. Brushing tools are generally used to clean well casings, tubing and the like of smaller debris and or particles than that of scraper tools. Brushing tools may be used to remove oxidation lumps, scale, paraffin and burrs for example.
As the brushing tools offer a more finishing cleaning operation than the casing scrapers, it would be desirable to run a brushing tool after a scraper tool, but for the cost of running two tools. Often the time and associated coat of hiring and running two cleanup tools is prohibitive. Having to withdraw the scraper from the well, replace it in the drill string with a brushing tool and then run the cleanup operation again is frequently considered difficult to justify. Also, simultaneously running both a scraper tool and a brushing tool in the same string means that one or both of the tools can not properly access the desired areas to be cleaned, such as near to the liner top; the combined tools not being sufficiently compact.
An object of the present invention is to provide an improved well cleanup tool that combines at least two types of cleaning members. For example a tool in accordance with the present invention may have both scraping and brushing cleaning members.
A further object of the present invention is to provide a compact well clean up tool with multifunctional cleaning members.
BRIEF SUMMARY OF THE INVENTION
According to the present invention there is provided a well clean up tool for cleaning the inside walls of a well casing, the tool comprising at least two types of cleaning members.
The tool may comprise scraper blades and brushes. Alternatively it may comprise a scouring pad and blades or brushes.
Preferably the tool comprises a supporting structure upon which is supported a row of first cleaning members axially spaced from a row of alternative cleaning members. The cleaning members may provide full circular or 360 degree contact with the casing wall at each row.
The supporting structure may comprise a generally elongated body member attachable to a work string or the like. It may include one or more cleaning pads supporting the cleaning members.
Means may be provided for rendering one form of cleaning members inoperable during use.
Preferably the tool further includes one or more stabilizers that serve to maintain contact of the tool with the internal casing walls. The stabilizers may be provided as sleeves that are free to rotate relative to the supporting structure.
REFERENCES:
patent: 2838121 (1958-06-01), Coyle
patent: 3128827 (1964-04-01), Kluck
patent: 3176772 (1965-04-01), MacGregor
patent: 4612986 (1986-09-01), Fosdick, Jr. et al.
patent: 5002139 (1991-03-01), Haussmann et al.
patent: 5452760 (1995-09-01), Bertagnolli
patent: 5570742 (1996-11-01), Reynolds et al.
patent: 5819353 (1998-10-01), Armell et al.
patent: 2 195 378 (1987-05-01), None
patent: 2 226 349 (1989-11-01), None
patent: 2 295 632 (1993-08-01), None
patent: 2 304 761 (1996-08-01), None
Carmichael Mark
Howlett Paul
Browning Clifford W.
Neuder William
Specialised Petroleum Services Limited
Woodard Emhardt Naughton Moriarty & McNett
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