Drill string mounted rotatable tool and cleaning method

摘要

A method of drilling and cleaning a wellbore while rotating the drill string after full drilling depth is reached without running the drill string out the bore to install a clean up work string is disclosed wherein a drill string having a drill bit at one end includes at least one near bit selectively activatable cleaning tool (10, 11, 12) mounted within the length of the drill string, said cleaning tool having a cleaning member (18) adapted to be moved from a close fitting stowed configuration within a recess (17) to a deployed configuration upon a body of the tool, wherein the cleaning member has magnets (19, 43) for use in positioning thereof, and compact tools for scraping, milling and brushing with improved resistance to ingress of detritus, debris and formation particulates are disclosed.

主权项

1. A cleaning tool comprising:
an elongate body having box and pin ends for attachment to drill pipe; and at least one selectively activatable cleaning member adapted to be moved from a stowed configuration to a deployed configuration upon the body of the tool by an axially displaceable actuation sleeve secured in a first axial position by a shear fastener, the at least one selectively activatable cleaning member provided with edge formations configured to cooperate with the tool body so as to obstruct penetration of debris or particulates into the tool during a drilling operation, wherein the cleaning member has magnets for use in positioning thereof, wherein the edge formations include a seal configured to cooperate with the tool body so as to inhibit penetration of debris or particulates into movable parts of the tool during a drilling operation.