Wellbore cleaning tool system and method of use

Abstract

A wellbore cleaning tool system includes a plurality of brushes and scrappers supported by or mounted to a casing body to clean an interior wall of a wellbore. The cleaning tool system includes selectively actuated high-velocity jet sprays to aid the cleaning of the interior wall of a wellbore by enhance the loosening and releasing of mud cake, oily residue, cement sheath, and pipe scale. The jet sprays also aid in the cleaning operation performed by and efficiency of the brushes and scrappers by spraying, loosening and releasing matter (mud cake, oily residue, cement sheath, and pipe scale) adhering to or sticking on the brushes and scrapers.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to tools for cleaning a wellbore and, more particularly, to a cleaning tool system that brushes, scrapes and selectively sprays, with high-velocity jet sprays, matter from the interior wall of a wellbore. [0003] 2. General Background [0004] Cleaning a wellbore with scraping and brushing has been employed in the oil field drilling and exploration industry. The cleaning out of the wellbore is essential so, for example, the flow of drilling fluid to the annulus of the wellbore remains unobstructed between tool casings and the interior wall of the wellbore. [0005] Drilling operations use drilling fluid (sometimes referred to as drilling fluid mud) that cakes onto the wellbore. The mud is very thick and may mix with any oil residue in the wellbore annulus. Pipe scale and cement sheath can also be found adhering to the wellbore casing or liner. When cleaning the unwanted mud cake from the wel...

AI Technical Summary

Benefits of technology

[0016] The preferred embodiment of wellbore cleaning tool apparatus of the present invention solves the aforementioned problems in a straight forward and simple manner.

Problems solved by technology

The mud cake may coat the blades and steel bristles and build-up thereon such that the efficiency of the scrapping and brushing is diminished.

Another of the disadvantages of known wellbore cleaning devices is the accumulation of round trip delays to journal the cleaning device down hole and to remove the cleaning device, such as each time the device needs cleaning, replacing broken parts, or before, during and after drilling operations.

The roundtrip delay time extends the time to complete drilling operations which increases the cost of operations.

Furthermore, known wellbore cleaning devices require repeated cleaning of the brushes and scraper, thus adding additional round trip delays.

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