A system and method for accessing an annulus within a wellhead assembly while the annulus is pressurized. The system includes a tubular body with an attached valve assembly and adapter. The adapter to the wellhead assembly with a sealed annular fitting. The body houses a selectively extendable plunger assembly rotatable by an attached motor. A bit or milling device is provided on the end of the plunger assembly, so that selectively extending the plunger assembly through the valve assembly and adapter contacts the bit against the wellhead assembly. An opening is formed through the wellhead assembly with the rotating bit allowing access to the annulus.
https://app.acclaimip.com/pdf/p8RGw1hSkGbVxEamvVKQar7FPjUgagt1xk85AqY/US8403039B2
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