The scaling potential of Miller wells is widely accepted as being perhaps the severest in the North Sea, if not the world. This creates a unique chemical challenge, the aim of which has always been to extend the lifetimes of scale squeezes across all the wells. A new scale inhibitor has been deployed which has achieved this goal. The chemistry in question is a novel polymeric chemistry which contains multiple functional groups, including phosphorus tagging.

Two years were spent developing and extensively testing the chemical in the laboratory, and the resulting product was assessed against those submitted as part of an industry wide search. The new chemical is now deployed on all Miller wells and performance has been beyond all expectations. Two wells have already seen a doubling in the treatment lifetimes resulting in thousands of barrels of incremental oil production. This is particularly important for Miller, where total operational efficiency is paramount as the cessation of production date approaches.

This paper documents some of the initial laboratory work involved with the development of the new chemical but mainly dwells upon the field treatments on Miller wells A14(19), A17(04), A18(32), A21(02), A25(29) and A26(08), covering almost 50 squeeze treatments. The paper goes on to describe the management strategy as well as the approach adopted to determine the limit of the squeeze life. In every case the chemical has outperformed the incumbent in terms of barrels of water protected and total scale inhibitor efficiency. This outcome is unprecedented on Miller: No other new chemical has delivered such a dramatic and significant improvement in scale control economics.

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