Publications by authors named "Huaxun Liu"
CCUS-EGR is becoming the most cost-effective method for energy saving and emission reduction globally. However, the acidic nature of CO can alter the reservoir permeability over time, affecting the stability and sustainability of gas injection. To explore this, long-term CO injection simulations were conducted on tight sandstone, carbonate rock, and volcanic rock.
View Article and Find Full Text PDFTight sandstone gas reservoirs are characterized by high water saturation, significant seepage resistance, low single-well productivity, rapid decline, and low gas recovery. Enhancing the recovery rate of tight sandstone gas reservoirs is a complex engineering challenge that necessitates thorough, refined, and systematic research into its fundamental theories. This study employs a comprehensive approach integrating mercury injection, nuclear magnetic resonance, micro-model visualization, and simulation experiments of displacement and inter-layer seepage flow, alongside foundational seepage theories, to systematically explore the characteristics of tight sandstone gas reservoirs, seepage patterns, and methods for improving gas recovery.
View Article and Find Full Text PDFArticle Synopsis
- The text discusses the challenges in modeling gas-water two-phase seepage due to various factors like pore throat size and lithology in gas reservoirs.
- The researchers applied Newton's laws of motion to establish a new seepage model, focusing on how velocity relates to pressure difference and other variables, leading to a steady-state model.
- They derived an equivalent permeability representation model and a relative permeability calculation method, which aligned well with measured values, enabling better analysis of reservoir permeability and productivity in gas well development.
Water production from gas wells is a key factor affecting the effectiveness of gas-reservoir development, and it poses serious challenges in terms of increasing the degree of recovery during the waterless production stage and reducing the impact of water production on gas-reservoir development in the middle and later periods. Thus, gas reservoirs must be efficiently exploited on the basis of identifying gas-water layers accurately, defining gas-water relationships, and understanding gas-water production performance. Accordingly, this study analyzes the production characteristics in gas reservoirs with different gas-water relationships, and it summarizes the rules that determine water-gas ratios.
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