Evaluation of field trials of an in-situ gel- forming chemical system for water shut-off in production wells at the West-Khosedayu field and it’s application potential in Vietnam
Abstract
This paper presents the research results and field trials of an in-situ gel-forming chemical system for water shut-off conducted at the West-Khosedayu field. The research was carried out by VNIIneft and field trials were implemented by Rusvietpetro Joint Venture Company. During the research phase, VNIIneft selected and optimized a chemical system with a gelation time of up to 70 - 80 hours at reservoir temperature, specifically suitable for selective plugging of high-permeability channels that serve as primary water conduits in fractured carbonate formations. Based on these research outcomes, during the period of 2019 - 2023, Rusvietpetro conducted 30 field trials in the D3fm-III reservoir, achieving a success rate of 96.7%. Each well was injected with an average of 500 m³ of chemicals into the zone below the open-hole interval. Results showed that average water cut decreased from 86% to 70%, oil production increased by an average of 20.3 tons/day/well immediately after treatment and sustained at 17 tons/day/well thereafter. The cumulative incremental oil production reached 179,719 tons. The success of this technology was attributed to three key factors: (i) development and selection of a gel-forming chemical system with properties tailored to reservoir conditions, (ii) accurate identification of target zones/wells based on geological and production criteria, and (iii) optimization of the injection and well treatment procedures.
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