The gas condensate fields of Western Siberia belong to multihorizon fields, composed of terrigenous deposits with various degree of permeability. During bottom-hole treatment BHT of such fields the acid mainly gets into the most drained and more permeable intervals. That is why less permeable layers are not treated, especially the cracks and pores of these layers. Separation of horizons allows the acid penetrate into less permeable intervals. Thus, each section of layers, which have to be treated, will undergo BHT.

At the closing stage of developing such fields with abnormally low formation pressure (ALFP) and a high degree of field water cut, it is difficult to perform BHT via wash pipes after well killing. It is also not always efficient due to additional formation clogging with killing liquids filtrates.

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