MULTI-LAYER DEPOSITS WITH HARD-TO-RECOVER OIL RESERVES DEVELOPMENT METHOD BY THE COMPACTING GRID METHOD Russian patent published in 2019 - IPC E21B43/14 E21B43/30 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the oil industry, and can be applied to the development of oil deposits with several objects, coinciding in structural terms, which reservoirs belong to hard-to-recover oil deposits. Method comprises the wells drilling by the grid, the wells grid compacting, lateral horizontal shafts drilling, taking products from wells. According to the invention, in the multi-layer reservoir structure most elevated part, drilling one single vertical or directional well, then from this well drawing two or three conventional circles, the first of which has a radius of 100–300 m, and each subsequent circle is spaced 100–300 m from the previous one, along the circles at equal distances from each other drilling two or three groups of 6–8 vertical and / or controlled directional wells, respectively. Wherein, the wells into the reservoir entry points are on the line of circles. In general, the one group wells are placed relative to another with the achievement of the maximum coverage of the reservoir by area, all wells are drilled to the lower reservoir. At that, the secondary opening is carried out along the deposit with the reservoir lowest permeability, after one of the wells oil flow rate reduction to less than 1 ton/day, this well is transferred to the reservoir with the highest permeability, with this well oil flow rate subsequent decrease to less than 1 ton/day, it is transferred to the remaining layers simultaneously-separate operation, wherein in one of the remaining formations, performing the lateral horizontal wellbore with a length of 200–600 m kickoff in the radial direction from the initial central well, performing the similar operations in all wells. Lateral horizontal wellbore is not drilled in the original central well.

EFFECT: technical result consists in increase in the oil deposit oil production rate.

1 cl, 1 dwg