METHOD FOR DEVELOPMENT OF SECTION OF OIL RESERVOIR WITH NON-RESERVOIR DEVELOPMENT ZONES Russian patent published in 2025 - IPC E21B43/20 

FIELD: mining.

SUBSTANCE: invention relates to oil industry, in particular to methods for development of formation oil deposit in inhomogeneous terrigenous reservoir of porous type. Method for development of section of oil reservoir deposit with zones of development of non-reservoir includes updating of geological structure based on results of drilling and simulation, determination of boundary zones of development of collector, allocation of zone of non-reservoir, drilling of horizontal well and extraction of products. Drilling of horizontal production well is performed with length of 350-400 m, when oil flow rate drops to 0.5 t/day, deep perforation of horizontal production well along entire shaft. Each perforation hole is separated from the previous one by no more than 10-12 m and is located subperpendicularly to the main borehole and the non-reservoir propagation line. Production horizontal well with deep perforation is developed for injection. Further, on both sides of the horizontal well switched for injection, three horizontal production wells are drilled symmetrically with length of horizontal part of not more than 250 m. On each side there located is one horizontal production well opposite the zone of rupture of non-reservoir development zones and perpendicular to the horizontal well switched for injection at distance of 350-400 m from it. Two other producing horizontal wells are located on both sides of well located perpendicular to horizontal well transferred for injection in fracturing zone, at distance of 200-250 m from it, at angle of 30-35° to non-reservoir distribution line in dead zones and not exceeding distance to non-reservoir distribution zones 200-250 m. All horizontal shafts of production wells are made in the least permeable interlayer and at least 1.0-1.5 m from the deposit bottom. Displacement agent is pumped through injection horizontal well with deep perforation in cyclic mode: during injection into a horizontal shaft of an injection well for 2-3 days, production horizontal wells – in idle time, then injection is stopped and within 7 days production is performed with production horizontal wells.

EFFECT: use of this method will allow maximizing oil recovery of a section of an oil stratum deposit complicated by a non-reservoir development zone, bringing into development non-draining oil reserves located in zones of non-reservoir distribution zone gap and near these zones.

1 cl, 1 dwg