Rotary and Milling Tool

MillOptimizer autonomous milling system

With the autonomous, coordinated control of the MillOptimizer autonomous milling system, the tractor and milling tool operate as a single intelligent system to maximize milling efficiency and ensure operation success:

• WOB and milling torque are autonomously monitored and adjusted to achieve a set torque and minimize stalling. 
• The bit stalling recovery sequence immediately detects stall events, if not prevented, and autonomously stops the tool, disengaging it by reversing the bit and the tractor, and then resuming milling operation without engineer action.
• Head-voltage stabilization autonomously adjusts surface voltage to maximize available downhole milling power and ensure equipment reliability.
• Over-temperature protection autonomously pauses the milling bit if the motor temperature exceeds the thermal limit to ensure safe operation at 350 degF [177 degC].
• Arm-force regulation continuously monitors and adjusts hydraulic pressure to maintain set arm force during and between milling operations.
• Antirotation protection continuously monitors the toolstring orientation and pauses the milling bit to prevent cable damage when required.

With the MillOptimizer system, dependency on the engineer's intervention is relaxed compared with existing wireline milling tools that need an experienced engineer to constantly monitor and adjust the milling parameters.

Optimized scale-milling bit

The milling tool uses a novel PDC bit design. Optimized for maximum ROP when milling hard scale buildup, this mill bit achieves the highest rate of scale volume milled within the power limits of electric wireline.