Determination of the Optimal Injection Ratio of Fluids in Water-Gas Influence

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Abstract

Unconventional reserves are increasing every year, and the classical development of fields with such reserves is becoming less effective, therefore, the application of enhanced oil recovery methods is highly relevant at the present time. This paper presents a method for increasing oil recovery through water-gas influence. There are two types of water-gas influence: alternating water and gas injection and simultaneous injection. This work focuses on alternating water and gas injection. The process involves the sequential injection of gas followed by water. This method is widely implemented, and experience in conducting such operations has already been accumulated. The goal was to identify scenarios that could cover the realistically possible conditions for the application of water-gas influence and to find the optimally effective ratio of water and gas injection. The parameters for ranking included reservoir permeability, reservoir compartmentalization, the development system with various well designs and spacing between wells, as well as various volumes of injected agents (water, gas). Multivariate calculations were carried out on a sectoral hydrodynamic model (E300). Since experiments on miscibility conditions were not conducted, it was assumed that oil displacement during water-gas influence occurred without gas mixing with oil. Based on the processing of the entire dataset (more than 10,000 calculations), a database of development systems with various input geological and physical characteristics was formed, where dependencies for cumulative oil production were obtained at different volumes of water and gas injection. The effect of water-gas influence is noticeable with reservoir permeability greater than 20 mD. The effective water and gas injection ratio should ensure that the liquid withdrawal compensation is above 100%, both for water and gas injection.

Keywords

Water-gas influencewater-gas mixturegas-oil contacthorizontal wellgas factorassociated petroleum gasreservoir pressure maintenancenear-wellbore zoneenhanced oil recoveryoil recovery coefficienthydrocarbonscompositional modelpilot industrial operationsmodelingcorrelation

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Article information

Published
24 February 2025
Issue date
24 February 2025
Issue
Vol. 25, No. 1 (2025)
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