METHOD OF PERFORMING A PERMANENT PLUGGING AND ABANDONMENT OPERATION OF A WELL AND A PERMANENT PLUGGING AND ABANDONMENT BARRIER FORMED BY THE METHOD

摘要

A method of performing a permanent plugging and abandonment operation of a well (W) by forming at least two barriers (RSB, CRSB), the method comprising the steps of: - providing an amount of a heat generating mixture (40), - positioning the heat generating mixture (40) at a first position in the well, the first position being at a cap rock (CR) of the well (W), - igniting the heat generating mixture (40) thereby melting surrounding materials at the first position, - waiting a period of time, thereby allowing the melted materials to solidify into a reservoir sealing barrier (RSB) which seals against a reservoir (R) in the well (W), - forming a cap rock sealing barrier (CRSB) at a second position in the well (W) by positioning a cap rock sealing material (CRSM) at the second position thereby sealing against the cap rock (CR). A permanent plugging and abandonment barrier formed by the method is also described.