METHOD FOR NON-STATIONARY EXTRACTION OF OIL FROM BED Russian patent published in 2006 - IPC E21B43/12 

FIELD: technology for extracting and operating oil deposits, in particular, method for increasing oil recovery of bed.

SUBSTANCE: in accordance to method periodical depression is realized without setting up well down-pump equipment. Operation mode of the latter is selected in interval from maximal to minimal debit values. Maximal debit is determined by consumed electric power of pump equipment at frequency not exceeding 60Hz. Minimal value of debit is reduced by decreasing consumed power of pump equipment by 30-40%, but not causing disruption of liquid extraction on well mouth. Balanced filtration mode is periodically restored until water saturation of extracted product decreases to values less than 30%. Outlet of trapped oil is provided into highly penetrable porous channels, resulting in growth of average oil recovery.

EFFECT: increased oil recovery of bed.

1 ex, 1 tbl, 1 dwg