Reverse circulation debris removal tool with well control feature
Abstract:
A reverse circulation debris cleanup tool has a pressure control valve that closes up a passage through the body based on a sensed well condition to help pressure control the well when rams close around the tool to isolate the surrounding annulus. The sensor can hold the valve open for a predetermined time to allow debris removal operations and then close. The debris chamber below an eductor in a VACS tool can be thousands of feet long and the valve can provide protection during running in or removal of the tool from well pressure events so as to avoid using shear rams and losing the bottom hole assembly in the borehole and a fishing operation to get it out.
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