Electrically driven coiled tubing injector assembly

摘要

An assembly and techniques for employing multiple motors to drive an oilfield injector. The injector is configured to drive a well access line such as coiled tubing and the motors may be electric in nature. Additionally, the motors are configured to operate at substantially sufficient cooling speeds for electric motors. Nevertheless, the motors are coupled through a common differential mechanism such that a range of differential speeds may be derived via comparison of the operating speeds of the motors. Thus, a wide array of injection speeds may be employed without requiring the motors to operate at dangerously low speeds in terms of electric motor cooling.

主权项

1. A method of running an oilfield injector assembly, the method comprising:
operating a first electric motor at a first motor speed; operating at least a second electric motor at a second motor speed; linking a differential gear box to the first electric motor and the second electric motor; establishing a differential speed based at least in part on comparison of the first and second speeds; linking a plurality of injector chains to the differential gear box through an injector gear box linked directly to the plurality of injector chains; and directing the plurality of injector chains of the oilfield injector to operate at a synchronized injector speed established based on the differential speed; the differential speed being reduced prior to said directing by the injector gear box.