METHOD FOR INCREASING OIL RECOVERY Russian patent published in 2007 - IPC E21B43/20 

FIELD: oil extractive industry, possible use in secondary oil extraction methods for increasing oil recovery.

SUBSTANCE: method includes adjustment - decrease of penetrability of water-conductive channels of bed through force wells by forcing in a buffer of reagents, stimulating in-bed precipitation growth. In accordance to invention in-bed precipitation growth is performed firstly from contour-adjacent and water-floating zones of bed and continued, successively enveloping bed zones with higher absolute marks of bed ceiling. In same direction oil is displaced with water. Across a group of wells or individual wells, current measurements of water content in oil being forced out are performed. For aforementioned purpose samples of liquid are taken from vertically ascending sections of discharge pipes at well mouth, displacement of oil with water is stopped and buffers of precipitation growing reagents are forced in again.

EFFECT: increased efficiency of method due to adjustment of penetrability of water-conductive channels of bed.

2 ex, 1 tbl, 2 dwg