METHOD FOR EXTRACTING OIL UNDER COMPLICATED CONDITIONS Russian patent published in 2004 - IPC

FIELD: oil extractive industry.

SUBSTANCE: method includes extraction of well liquid, paraffin removal, determining debit of well liquid and determining optimal number of days of inter-cleaning period for well equipment on basis of at least two control steps of well operation. Every day debit of well liquid is measured and every day decrease of oil debit relatively to oil debit at the beginning of first control step of oil operation is determined. Total losses are determined, connected to decrease of debit, and costs of paraffin removal by thermal or chemical treatment of well. At the moment of even costs inter-cleaning period for well equipment is determined for first control step of well operation. Following paraffin removal process is performed by means of thermal or chemical well treatment. Then, all mentioned operations are performed at second control step of well operation. Optimal number of days for inter-cleaning period for well equipment is determined at the moment of lowering of oil debit down to average value at the end of first and second control steps of well operation. Inter-cleaning period for well equipment for each control operation step is determined on basis of formula.

EFFECT: higher effectiveness of oil extraction under complicated conditions and lesser operation costs.

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