DEVELOPMENT METHOD OF ULTRAVISCOUS OIL DEPOSIT BY WELLS WITH "SMART" PERFORATION Russian patent published in 2020 - IPC E21B43/24 E21B43/11 

FIELD: oil industry.

SUBSTANCE: invention relates to oil industry and can be used in development of non-uniform deposits of ultraviscous oil using production strings with specified perforation in horizontal wells. Proposed method comprises drilling of steam-injection horizontal well and located below horizontal production well, lowering of production strings, cementing of shafts and secondary penetration of formations, pumping of steam into injection well and withdrawal of product from production well. At the same time in the horizontal boreholes of the producing and/or injection wells density of perforated holes is made directly proportionally, and sizes of perforation holes are inversely proportional to collector permeability opposite to corresponding intervals of the shaft. Length of each interval is determined so that change in collector permeability within each interval does not exceed 50 mD. Filter is made in horizontal perforated bore of production well and represents a pipe with multiple slit-like holes located perpendicular to pipe axis. Width of holes is 100–200 mcm, distance between holes is 100–500 mcm, and length of holes is 0.2–0.8 of filter circumference.

EFFECT: technical result is higher oil recovery of non-uniform deposit of ultraviscous oil.

1 cl, 4 ex, 1 tbl, 1 dwg