INVESTIGATION OF THE CAUSES AND MECHANISMS OF WELL PRODUCTIVITY DECLINE IN MASSIVE-TYPE OIL RESERVOIRS CONSIDERING THE GEOLOGICAL STRUCTURE OF THE NEAR-WELLBORE ZONE

Abstract

This study presents a comprehensive investigation of the causes and mechanisms responsible for the decline in the productivity of oil wells producing from massive-type reservoirs, with particular emphasis on the geological structure and filtration properties of the near-wellbore formation zone. The research methodology combines a critical analysis of published field data on massive and gas-cap oil reservoirs in the Bukhara – Khiva oil and gas region, information on skin-effect formation and formation damage, results of studies on water coning and fractured reservoirs, as well as the author’s parametric analysis based on a radial composite inflow model. To distinguish between geological and induced components, the total skin factor is considered as the combined effect of near-wellbore formation damage, geological heterogeneity, imperfect reservoir completion, and multiphase flow effects. It has been established that the decline in well productivity in massive-type reservoirs is caused not by a single factor, but by the combined influence of vertical geological heterogeneity, anisotropy, reservoir fracturing, the position of the perforation interval relative to the oil – water contact, changes in oil relative permeability, and induced deterioration of rock permeability in the vicinity of the wellbore.

Keywords

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References

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