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US 8,074,742 B2Granted
Apparatus and method for cutting a wellbore
AssigneeDeep Casing Tools, Ltd.
InventorsEdward D. Scott, Lance S. Davis
Life of this patent
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AssigneeDeep Casing Tools, Ltd.
InventorsEdward D. Scott, Lance S. Davis
Estimating the term…
An apparatus for cutting a wellbore includes a motor with a stator and a rotor. The rotor includes an output shaft connected to a cutting structure to drive the cutting structure in use. The stator and rotor are spaced radially outwardly of the axis of the rotor such that at least one of the stator and the rotor has an access bore that extends through the motor to a position adjacent the cutting structure and through which a further object can pass without obstruction from the stator and rotor. The further object includes a further cutting structure. The motor workings are radially outward of the output shaft and the further cutting structure so as not to obstruct passage of the further cutting structure toward the cutting structure, such that the motor workings do not require drilling or removal to allow the further cutting structure access to the cutting structure.
An apparatus for cutting a wellbore, the apparatus comprising a motor having a stator and a rotor, the rotor comprising an output shaft connected to a first cutting structure so as to drive the first cutting structure in use, wherein the stator and the rotor are formed to create an access bore that extends through the motor to a position adjacent the first cutting structure and through which, in use, a further object can pass through the stator and rotor, the further object comprising a second cutting structure, the motor access bore configured so as to enable passage of the second cutting structure toward the first cutting structure, such that the motor enable the second cutting structure access to the first cutting structure for drilling therethrough by the second cutting structure.
A method for cutting a wellbore, the method comprising rotating an output shaft of a rotor of a motor connected to a first cutting structure so as to drive the cutting structure into the earth to a desired depth, wherein a stator and rotor of the motor are formed to provide an access bore that extends through the motor to a position adjacent the cutting structure, and passing a further object through the access bore, the further object comprising a second cutting structure of the apparatus, the motor workings forming access bore so as to enable passage of the second cutting structure toward the first cutting structure, such that the motor enables the second cutting structure access to the first cutting structure through the access bore.
Dependencies are inferred from the claim text.