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1. (WO2018085575) DEBRIS BRIDGE MONITORING AND REMOVAL FOR UPHOLE MILLING SYSTEM

Pub. No.:    WO/2018/085575    International Application No.:    PCT/US2017/059773
Publication Date: Sat May 12 01:59:59 CEST 2018 International Filing Date: Fri Nov 03 00:59:59 CET 2017
IPC: E21B 29/00
E21B 10/32
E21B 47/00
E21B 23/06
Applicants: BAKER HUGHES, A GE COMPANY, LLC
Inventors: CLEM, Nicholas J.
FENG, Lei
Title: DEBRIS BRIDGE MONITORING AND REMOVAL FOR UPHOLE MILLING SYSTEM
Abstract:
A bottom hole assembly (BHA) contains a motor and a section mill for milling in an uphole direction after blade extension with circulating fluid through the BHA. Below the section mill is sensing equipment to detect location of a bridge formed by the cuttings or swarf from the section mill. A secondary mill oriented for cutting in a downhole direction is located at the bottom of the BHA for use in removal of the bridge. The sensing equipment delivers in real time data as to the density of the bridge so that decisions to interrupt the section milling and to lower the secondary mill to the bridge can be made in real time. Cement is pumped and displaced by a wiper plug to plug and abandon the hole.