Comprehensive treatment of wells to control the gas oil ratio

UDK: 622.276.4

DOI: 10.24887/0028-2448-2026-2-40-45

Key words: gas oil ratio, gas cone, water injection, hydrate formation, development management, oil and gas fields of Eastern Siberia, Srednebotuobinskoye field, production efficiency

Authors: E.N. Ivanov (Taas-Yuryakh Neftegazodobycha LLC, RF, Irkutsk; Irkutsk National Research Technical University, RF, Irkutsk; Irkutsk State University, RF, Irkutsk); R.I. Ermekov (Taas-Yuryakh Neftegazodobycha LLC, RF, Irkutsk); M.M. Abdullin (Rosneft Oil Company, RF, Moscow)

The article initially presents the results of a field trial of an innovative technology for injecting undersaturated water to control gas-oil ratio in oil wells, developed by a subsidiary of Rosneft Oil Company. The basic technology of injecting undersaturated water into producing wells is used in the gas industry for well killing, as well as for small-volume water injection during well workovers to displace the gas cone. The presented technology was improved to use the large-cap water injection for treatment in combination with well settling in fields with a massive gas cap. The technology is aimed at suppressing gas coning in wells operating in sub-gas zones with a high gas-oil ratio and is applicable to reservoirs using water with a density of 1100 kg/m³ and higher. The method is based on high-volume water injection into the oil-producing well from the nearest injection well. The physical basis of the method includes gas displacement through water penetration into the pressure-depleted zone, improvement of relative phase permeabilities, partial gas dissolution, stimulation of hydrate formation in the coning zone. The field trial conducted at the Srednebotuobinskoye field demonstrated high technological efficiency: after injecting a large volume of water, the gas-oil ratio was significantly reduced, oil production rate increased, well performance stabilized. The proposed technology shows high potential for improving the economic efficiency of developing hard-to-recover reserves of Rosneft Oil Company fields in Eastern Siberia without major capital investments. Further pilot-industrial operations are planned to refine the applicability criteria and optimize treatment parameters.

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