Mud motor with integrated percussion tool and drill bit

摘要: A downhole tool having a progressive cavity mud motor with an impact generator disposed within the rotor or bearing assembly. In one embodiment, includes turbine connected to eccentric ring that encircles and periodically strikes anvil surface of percussion shaft. The is pivotable between engaged striking position disengaged non-striking position. shaft coupled drill bit though splined connector provides limited slip for transmitting rotation against without need accelerate entire string.