Borehole operating tool with fluid circulation through arms

Claim 1

Apparatus for performing operations in an oil well drilling borehole or other borehole, comprising: an elongated generally cylindrical body having a main bore there through, said body having a plurality of lateral openings therein; said body having a plurality of circumferentially spaced directional chambers which extend between said main bore and said plurality of lateral openings; a plurality of expandable arms, each arm having a first end and a second, operating end having an operating surface or element thereon for engaging the side of a borehole and performing an operation thereon; pivot means mounted with said body and with said first end of said expandable arms for mounting each of said plurality of expandable arms in one of said lateral body openings for movement between a closed position in which said arm is positioned in said lateral body opening and second, expanded operating position in which said operating end of said arm engages said borehole; means for engaging said plurality of expandable arms and holding said expandable arms in an operating position; each of said expandable arms having a bore therein, which bore extends from said first end of said expandable arm and terminates at said second operating end; a rotary fluid transfer means for each expandable arm, each of said rotary fluid transfer means being mounted with said body in fluid communication with one of said circumferentially spaced directional chambers and with said first end of said expandable arm substantially surrounding said pivot means for directing fluid from said one directional chamber to said bore in said expandable arm for directing fluid outwardly of said expandable arm.