MILLING SYSTEM PROVIDING CUTTINGS RE-CIRCULATION

摘要

Milling systems, tools, and methods include using a mill with a barrier to promote re-circulation of debris and cuttings to the face of the mill. The face of the mill may include cutting elements. A barrier may obstruct the flow of cuttings and debris away from the face to re-circulate the cutting and debris to promote re-milling of the cuttings and debris by the cutting elements of the face of the mill. The barrier may include a hydraulic barrier formed by fluid expelled from nozzles in or above the mill. A secondary attrition system uphole of the mill may also be used to stage conditioning and re-sizing of cuttings and debris. After debris and cuttings pass through the barrier, the secondary attrition system may re-mill the cuttings and debris to a finer size before allowing the cuttings and debris to pass into the wellbore annulus for transport to the surface.

主权项

1. A downhole milling system, comprising:
a milling bit having a face, the milling bit including at least one cutting element on the face configured to mill a downhole tool; and a barrier configured re-circulate cuttings and debris generated by the at least one cutting element to the face of the milling bit.