Patent ID: 7472745
Filing Date: 2009-01-06
Classification: E21B

Abstract:
1. A milling debris catching tool for downhole use in a tubular string from the surface, comprising: a mill adapted to pass a predetermined fluid flow rate to remove cuttings from a milled object; a tool body having at least one inlet and outlet and a milling debris receptacle; a screen in a passage between said inlet and outlet to accept debris laden fluid and to prevent milling debris from passing through the tool so that it can be retained in said receptacle; a sensor to detect how flow through said screen from said inlet to said outlet compares to the predetermined rate, said sensor operably connected to a valve member in said tool and selectively reconfiguring said passage for flow from said outlet to said inlet in an effort to unclog said screen if flow from said inlet to said outlet through said screen is below said predetermined rate.