METHOD OF FLUID OIL PRODUCT EXTRACTION FROM UNDERGROUND WATER SURFACE AND ENGINEERING PROTECTION SYSTEM FOR METHOD IMPLEMENTATION Russian patent published in 2012 - IPC C02F1/40 B09C1/00 

FIELD: gas and oil production.

SUBSTANCE: inventions refer to ecology and are intended for liquidation of anthropogenic accumulation of oil products at underground water surface and prevention of oil product discharge to open water basins and water intake horizons. A well is drilled within contamination spot. Inside, temporary casing string 1 out of large diameter pipes, with water lifting section 2 with electric water lifting submersion pump 4 and oil product lifting section 3 with oil lifting submersion pump 5 installed at lesser depth. Electric pump 4 drains water to form depression funnel at the surface of water and oil interface and to collect oil products in the funnel. Then electric pump 5 extracts oil products selectively. Sections 2 and 3 are made in the form of independent filter strings with filters 6 and 8 at their bottoms. Each filter includes head 7 and sole 9. Water lifting section filter is positioned at the interface depth, and filter of oil product lifting section is installed above interface level. Filters are dusted with broken screening material (pebble or gravel) by filling space of temporary casing string, then casing string pipes are removed from the well.

EFFECT: high degree of oil product removal from extracted underground water due to minimised secondary pollution of underground water with fluid oil products.

4 cl, 1 dwg