Wellbore motor system

A motor system for rotating a tool attached thereto, the motor system comprising

• a first motor and a second motor interconnected with the first motor, each motor further comprising
• a housing,
• a hollow tubular stator secured in the housing having at least two stator recesses therein and at least two intake ports therethrough, an interior wall of the stator defining an interior stator space,
• a rolling stator rod seal movably disposed in each stator recess and freely movable therein and therefrom,
• a tubular rotor movably disposed within the stator for rotation therein, the tubular rotor having an interior exhaust fluid flow channel therethrough and extending along the length of the tubular rotor, the tubular rotor having at least two continuously open radial exhaust channels therethrough in fluid communication with the interior exhaust fluid flow channel,
• the tubular rotor having at least two rotor recesses and solid rolling rotor rod seals in each rotor recess, each rolling rotor rod seal freely movable from the rod recesses by force of the motive fluid to sealingly contact the stator,
• at least two action chambers between the hollow tubular stator and tubular rotor, each action chamber defined by an interior surface of the hollow tubular stator and an exterior surface of the tubular rotor, each action chamber sealed at one end by one of the rolling stator rod seals and at another end by one of the rolling rotor rod seals, said motive fluid flowable through the intake ports of the hollow tubular stator, into the interior stator space and the at least two action chambers, through the at least two continuously open radial exhaust channels of the tubular rotor, and into the interior exhaust fluid flow channel of the tubular rotor,
• the rolling stator rod seals and the rolling rotor rod seals movable in and from their respective recesses by the motive fluid, the rolling stator rods movable by the motive fluid to sealingly contact the rotor and roll along an exterior surface of the rotor, and the rolling rotor rod seals movable by the motive fluid to sealingly contact the stator and to roll along an interior surface of the stator, and
• the stator of the first motor disposed out-of-alignment with the stator of the second motor.

A method for cleaning crud from an interior of a tubular member, the method comprising

• inserting a motor system attached to a cleaning tool into the tubular member adjacent the crud, the motor system comprising a first motor and a second motor interconnected with the first motor, each motor further comprising a housing, a hollow tubular stator secured in the housing having at least two stator recesses therein and at least two intake ports therethrough, a rolling stator rod seal movably disposed in each stator recess and freely movable therein and therefrom, a tubular rotor movably disposed within the stator for rotation therein, the tubular rotor having an interior exhaust fluid flow channel therethrough and extending along the length of the tubular rotor, the tubular rotor having at least two continuously open radial exhaust channels therethrough in fluid communication with the interior exhaust fluid flow channel, the tubular rotor having at least two rotor recesses and solid rolling rotor rod seals in each rotor recess, each rolling rotor rod seal freely movable from the rod recesses by force of the motive fluid to sealingly contact the stator, at least two action chambers between the hollow tubular stator and tubular rotor, each action chamber defined by an interior surface of the hollow tubular stator and an exterior surface of the tubular rotor, each action chamber sealed at one end by one of the rolling stator rod seals and at another end by one of the rolling rotor rod seals, said motive fluid flowable through the intake ports of the hollow tubular stator into the interior stator space and the at least two action chambers, through the at least two continuously open radial exhaust channels of the tubular rotor, and into the interior exhaust fluid flow channel of the tubular rotor, the rolling stator rod seals and the rolling rotor rod seals movable in and from their respective recesses by the motive fluid, the rolling stator rods movable by the motive fluid to sealingly contact the rotor and roll along an exterior surface of the rotor, and the rolling rotor rod seals movable by the motive fluid to sealingly contact the stator and to roll along an interior surface of the stator, and the stator of the first motor disposed out-of-phase with the stator of the second motor,
• flowing motive fluid to and through the motor system so it rotates the cleaning tool and exits therefrom to contact the crud, and
• the motive fluid comprising a fluid which degrades the crud.