| China's carbonate gas reservoirs are facing a strategic situation of enhanced gas recovery (EGR). Currently,
there is no universally applicable theoretical and technical system for improving recovery rates in carbonate gas reservoirs
both domestically and internationally. This article summarizes the theoretical research and field practice of EGR of
carbonate gas reservoirs in China in the past 70 years, and summarizes five research paradigms from four levels of
"Philosophy, Strategy, Tactics, Execution". Based on the connotation of EGR, a calculation method for gas reservoir
recovery rate is established from the perspective of engineering philosophy, and the technical methods and key issues for
evaluating gas reservoir recovery rate are discussed in detail. By comparing the connotation, technical methods, and
practical status of enhanced gas recovery in five typical carbonate gas reservoirs, the following three suggestions are put
forward: (1) Improve the systematic evaluation of gas reservoir recovery efficiency, integrate various research data and
results from the perspective of the whole gas reservoir, and establish the workflow of understanding→new data
supplement→re-understanding under the framework of "static and dynamic data integration"; (2) Quantitatively evaluate
the contribution of different strategies to EGR, conduct field research and verify primary data, fully compare theoretical
models with field data, improve the match of static and dynamic descriptions, and repeatedly adjust and establish
reasonable prediction models; (3) Strengthen the comparative study of different strategies to enhance gas reservoir
recovery, gradually upgrade the scattered different strategies from perceptual understanding to qualitative and quantitative
understanding, and quantitatively evaluate the EGR values of different strategies in the research area, and quantify the role
of different technologies in improving gas reservoir recovery. The research results can promote the concept and theoretical
technology progress of EGR in China's carbonate gas reservoirs and ensure national energy security. |
