METHOD FOR CLEANING INNER SURFACE OF INDUSTRIAL PIPELINES OF OIL-PUMPING STATIONS DURING PREPARATION FOR PUMPING OF LIGHT OIL PRODUCTS Russian patent published in 2017 - IPC B08B9/02 

FIELD: oil and gas industry.

SUBSTANCE: cleaned area is looped using a collapsible pipeline and a centrifugal pump to allow circulation of the pumped medium. The entire cleaned internal volume of the area is filled with an ARPD solvent, for which the limiting saturation coefficient is determined. ARPD solvent is kept in static mode for at least 24 hours, followed by circulation. Every 12 hours ARPD solvent is sampled to determine the value of the solvent saturation coefficient. The circulation of the ARPD solvent is stopped when constant values of the saturation coefficient are reached in at least three samples in a row or when the limiting saturation coefficient is reached. If the saturation limit is reached, the ARPD solvent is replaced with a new one, circulating a new batch of ARPD solvent until a constant value of the saturation coefficient is reached. The ARPD solvent, which has reached the constant values of the saturation coefficient, and the cleaning products are removed. Then the cleaned area is filled with an adsorption oil product which is maintained in a static mode for at least 24 hours, followed by circulation until the monitored quality indicators in the adsorption oil product reach constant values. Sampling is carried out every 12 hours. The circulation of the adsorption oil product is stopped when the constant values of the monitored quality indicators are reached in at least three samples in a row. The adsorption oil product is then removed from the cleaned area, followed by its control oil product, which is kept in a static mode for at least 24 hours, followed by circulation for 3 hours, with a capacity ensuring the pumping of at least 3 volumes of the cleaned area. After each pumping cycle, sampling and sample analysis of the control oil product are carried out. Cleaning is stopped when the constant values of the samples quality indicators of the control oil product are reached, which do not exceed the requirements of regulatory documents for the quality of oil products used as control products.

EFFECT: improving the quality of cleaning the inner surface of pipes, ensuring the required quality of pumped light oil products.

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