Matrix acidizing of sandstone formations in Western Siberia, Russia has been a technology application that has been largely ignored by operators in this area. Poor acidizing practices and difficult mineralogies have lead to poor results from matrix acidizing treatments applied in the past. With the relative success of skin bypass fracturing treatments and the development of a fracturing stimulation environment within Russia, matrix acidizing has been rendered essentially irrelevant. This paper reviews past and present practices and explores the reasons why matrix stimulation has been largely unsuccessful in Western Siberia. The paper also explores the developing need for matrix treatments, particularly in horizontal wells, and the application of modern acidizing systems and techniques in Western Siberia and the challenges associated with applying these "new" technologies

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