METHOD FOR EXTRACTION OF OIL DEPOSIT Russian patent published in 2005 - IPC

FIELD: oil extractive industry.

SUBSTANCE: method includes pumping working agent into wells of force rows and/or locked force blocks, extraction of liquid and gas from extraction wells, separation of force and product wells on portions and groups and physical effect on productive beds, in particular change of direction of filtering flows. Prior determination of relative remainder extracted oil deposits in productive bed is provided along watered product wells and portion as a whole. Calculation of adapted, on basis of parameters of oil displacement in whole portion, oil saturation level in product of liquid for values of relative remainder oil resources in each product well. Than product wells are singled out, in which actual oil level is not less than adapted for relative remainder oil resources of this well. These wells together with water-less wells are left in constant operation in mode of maximal liquid extraction. Remaining extraction wells as well as force wells are enabled in periodical operation in groups. At the same time in one semi-cycle a group of force wells is enabled in operation in mode of minimal working agent volume pumping mode, and product wells being in area of effect of these - in mode of maximal liquid extraction, or vice versa. In following semi-cycle modes of operation of product and force wells are swapped with opposite ones. Grouping of product wells and modes of their operation are corrected in accordance to changes of relative remainder extracted oil resources, actual and adapted oil level in wells in time.

EFFECT: higher oil yield of productive beds.

20 cl, 3 tbl, 1 ex, 2 dwg