In article data on types of firm deposits (ASPO,hydrates, salts), and their complexes are provided in oil wellsof Eastern Siberia. On the basis of practical supervision thereasons of firm deposits and a condition of their emergenceare defined during the developing and investigation of oilfields of Eastern Siberia. Data on a chemical composition ofreservoir and pumped waters, their distinctions are stated.Data of mathematical modeling of process of mixture of watersare provided. It is brought practical techniques of removal offirm deposits.

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