Severe losses when RIH with 10 ¾ x 9 ⅝" MLT liner in the reservoir on the Troll field was observed in three successive wells. A detailed study to find the cause was undertaken. The only deviation from previous liner runs was a new circulation procedure at 12 ¼ section TD. After re-establing the best practice procedures no further loss incidents have been observed. This paper confirms the need for multi-disciplinary discussions before the drilling procedures are changed.

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