Wellbore reaming tool having locking clutch for drill out after running wellbore tubulars

Abstract

A reaming tool for use while inserting tubular components into a wellbore includes a motor housing configured to be coupled to one end of a string of tubular components. A motor is disposed in the housing. An output shaft is rotationally coupled to the motor. the output shaft is configured to be coupled to a cutting structure at one end thereof. A lock is selectively engageable to rotationally fix the output shaft to the motor housing.

What is claimed is: 
     
         1 . A reaming tool for use while inserting tubular components into a wellbore, comprising:
 a motor housing configured to be coupled to one end of a string of tubular components;   a motor disposed in the housing;   an output shaft rotationally coupled to the motor, the output shaft configured to be coupled to a cutting structure at one end thereof; and   a lock selectively engageable to rotationally fix the output shaft to the motor housing.   
     
     
         2 . The reaming tool of  claim 1  wherein the lock comprises a male cone disposed within a mating female cone. 
     
     
         3 . The reaming tool of  claim 1  wherein the lock is engageable by application of axial force to the motor housing. 
     
     
         4 . The reaming tool of  claim 3  further comprising axial restraints configured such that a selected minimum axial force is required to engage the lock. 
     
     
         5 . The reaming tool of  claim 4  wherein the axial restraints comprise shear pins or shear rings. 
     
     
         6 . A method of running a bore-lining tubular string into a wellbore, comprising:
 attaching an apparatus to a leading edge of the bore-lining tubular string, the apparatus comprising a motor disposed in a housing coupled to the leading edge, an output shaft rotationally coupled to the motor and a first cutting structure attached to an end of the output shaft;   inserting the bore-lining tubular string with the attached apparatus into the wellbore to a selected depth while causing the output shaft to rotate;   on reaching the selected depth, stopping rotation of the output shaft and locking the output shaft to the motor housing; and   inserting a second cutting structure disposed at the end of a pipe string into the tubular string to remove at least part of the first cutting structure.   
     
     
         7 . The method of  claim 6  wherein the locking comprises engaging a lock by applying axial force to the motor housing. 
     
     
         8 . The method of  claim 6  wherein the applying axial force comprises at least one of applying axial force to hold up the tubular string and applying fluid flow to the motor to cause pressure drop therein above a selected amount. 
     
     
         9 . The method of  claim 6  wherein the second cutting structure comprises a drill bit. 
     
     
         10 . The method of  claim 6  wherein the causing the output shaft to rotate comprises pumping fluid through the motor.