Portable tester for downhole motors

摘要

A simple torque-testing tool, particularly for downhole progressing-cavity motors, easily bolts on to the bearing housing on one end and the bit box on the other end. The assembly is first screwed together where a predetermined amount of preload is applied to opposing clutch surfaces. Opposite ends of the housing are affixed to the bearing housing uphole and the bit box downhole and a predetermined amount of flow is run through the stator housing. If the downhole motor is close to its design operating parameters for a given flow rate, it should be able to drive the bit box despite the drag applied by the opposing clutch surfaces. Failure of the downhole motor to be able to overcome the resistance from the device at the predetermined flow rate indicates that the motor is worn. Torque resistance is applied preferably by stacked Belleville washers which can be stacked in a number of arrangements to alter the amount of force. The applied force from the Belleville washers can be altered by rig personnel when assembling the device. The device can be used on a variety of motor types or applications.