Patent ID: 6684965
Filing Date: 2004-02-03
Classification: E21B

Abstract:
An apparatus adapted for advancement into a well bore, the apparatus comprising;an advancable rotating downhole tool; a driving motor; coiled tubing having a lower end thereof indirectly connected to the driving motor wherein the coiled tubing minimally absorbs torques; an elongated carriage comprising a first and a second carriage sections and provided with rotatable driving wheels of fixed orientation, orientated in the longitudinal direction of the carriage, said carriage being equipped with end couplings, one for connection to a free outer end of said coiled tubing through a swivel device, and one for connection to the tool; and a pulling device connected to the coiled tubing for pulling on the coiled tubing for advancing purposes wherein each wheel is positioned and grouped in longitudinal rows within each longitudinal carriage section, the radial central plane of the wheels being in a transversal plane in the respective carriage section, dividing the circumference of the respective carriage section into two halves, and is displaceable in a transversal direction of the carriage through its direct connection to a cylinder-and-piston device in order to be carried by an adjusted/controllable compressive force into friction-creating abutment on an adjacent surrounding internal casing surface or formation wall surface defining the well bore.