H-02 ANALYSIS OF SEISMIC RECORDINGS DURING INJECTION USING IN-WELL PERMANENT SENSORS O. BARKVED 1 E. GAUCHER 2 B. HORNBY 3 T. KRISTIANSEN 1 and C. MAISONS 2 Introduction 1 During re-completion of the Valhall A-25B T3 well in the end of July 2001 a permanent in-well seismic monitoring system was deployed. This well was initially completed as a horizontal deep flank producer but was later converted to a waste injector due to poor performance. Waste primarily drill cuttings is slurrified and injected at limited volumes and rates as needed. During drilling the injection will normally last for 2-3 hours twice


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