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1. (WO2018122548) A DOWNHOLE MONITORING METHOD

Pub. No.:    WO/2018/122548    International Application No.:    PCT/GB2017/053819
Publication Date: Fri Jul 06 01:59:59 CEST 2018 International Filing Date: Wed Dec 20 00:59:59 CET 2017
IPC: E21B 27/02
E21B 29/02
E21B 33/12
E21B 43/11
E21B 47/06
E21B 47/12
E21B 47/18
Applicants: METROL TECHNOLOGY LIMITED
Inventors: ROSS, Shaun Compton
JARVIS, Leslie
Title: A DOWNHOLE MONITORING METHOD
Abstract:
A method to test or monitor the integrity of a cement barrier, comprising providing an assembly therebelow including: a perforating device;a control mechanism to control the perforating device, a pressure sensor, a wireless communication device and a pressure sensor. The perforating device is activated to perforate casing below the barrier and a pressure test may be conducted. The creation of the perforation(s)below the barrier allows an assessment of the integrity of the barrier across its entire width, and especially its bond to the formation, rather than only a central portion of the barrier. Electromagnetic or acoustic wireless signals are used to retrieve data from below the barrier.