Patent ID: 10837874

Abstract:
A method for evaluating load performance of a rotor/stator test coupon tested within a sealable test chamber containing test fluid. The test coupon preferably includes at least a partial length of a PDM stage. Alternatively, the test coupon may include a splined rotor/stator. The method includes rotating either the rotor section or the stator section in order to actuate corresponding rotation of the other of the rotor section and the stator section. Non-linear torque in the form of an acceleration torque and/or a braking torque may be applied to either the rotor section or the stator section. Downhole stall conditions may be simulated by selectively engaging and disengaging a second motor and flywheel to vary rotational torque applied to the test coupon. Load performance of the test coupon may be evaluated over time in such simulated stall conditions.