A Study on CO₂ Enhanced Oil Rim Recovery for Complex Fault Block Sandstone Gas Condensate Reservoir

Abstract

The characteristic of high CO₂ content in gas reservoir fluids has been fully utilized and the applicability of EOR by CO₂ injection has been studied aiming at the problem of low oil recovery in the middle and late stages of depletion development of complex fault block sandstone condensate gas reservoirs. In addition, a proposal has been presented on the study of single-well huff-puff and slug flooding to strive to reduce CO₂ emissions and achieve both economic and environmental benefits while improving oil rim development effects. The selection criteria for target wells have been formulated. A proposal has been put forward on the design of parameters such as small cyclic gas injection rate, multiple injection rounds, etc. The best injection and production parameters have been optimized, including cyclic injection volume, injection rate, soaking time, fluid production rate, huff-puff cycle, etc. The CO₂ slug flooding design scheme for the target well area has been further worked out. According to the overall development effect, slug flooding has formed a synergistic effect of edge water flooding, bottom water flooding and CO₂ flooding, and has a better development effect than single-well CO₂ huff-puff.

Copyright 2019, IFEDC Organizing Committee.

This paper was prepared for presentation at the 2019 International Field Exploration and Development Conference in Xi’an, China, 16–18 October, 2019.

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