Investigation on Effect Application of the Technology of Crestal Gas Injection for Stable Gravity Flooding

doi:10.11885/j.issn.1674-5086.2013.09.02.01

Abstract

Abstract:

The technology of crestal gas injection for stable gravity flooding can get highest EOR among all non-miscible gas injection technologies. Focused on major factors influencing crestal gas injection for stable gravity flooding and factors to be considered for the application to domestic reservoir，studies suggest that stability of gas-oil interface is the key to the success of implementing the technology of crestal gas injection for stable gravity flooding，and that the geological factor（angle of bedding、reservoir heterogeneity）and development factors（critical gas injection rate、regional injection-production ratio）are the key factors that affect the stability of gas-oil interface. Through quantifying the production loss caused by the special work pattern of the initial production phase，we hope to provide reliable reference for choosing the best moment of implementing the technology for oil-field. Taking a reservoir in western China for an example，we bring forward a new thought-“taking both injection and production into consideration，controlling drawdown pressure and limiting production”，offering the strategy of reference for the implementing of the technology in other similar reservoir.

Key words: crestal gas injection for stable gravity flooding, gas-oil interface, critical gas injection rate, regional injectionproduction
ratio, secondary gas cap

Liang Shuxian1, Zhou Wei1,Zhang Jiandong2. Investigation on Effect Application of the Technology of Crestal Gas Injection for Stable Gravity Flooding[J]. 西南石油大学学报(自然科学版), DOI: 10.11885/j.issn.1674-5086.2013.09.02.01.

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