Optimization of CO2 huff and puff scheme and evaluation of test effect in J block,country Y
The major oil and gas field G in J block of country Y is a sandstone condensate gas reservoir characterized by medium porosity and permeability,with edge-bottom water and thin oil rims.To address challenges such as high water content during oil rim development,dispersed remaining oil,and low reservoir pressure,a method involving CO2 huff and puff to enhance oil recovery is proposed.Numerical simulation studies were conducted to optimize the injection and production parameters of the CO2 huff and puff process,and dynamic tracking analysis clarified that replenishing reservoir energy and controlling bottom water are the key mechanisms for the success of CO2 huff and puff method.Factors affecting the effectiveness of the CO2 huff and puff test were identified,including immiscible displacement,development of over-saturated crude oil using vertical wells,severe reservoir energy deficit before CO2 huff and puff,and discontinuous injection along with excessively long soaking periods.With the triple objectives of production security,increased production efficiency,and carbon sequestration,optimal CO2 huff and puff parameters were established under varying water content in the study area.The research results can provide valuable experience for the application of CO2 huff and puff technology in complex faulted sandstone reservoirs with gas cap and edge-water.
Sandstone condensate gas reservoirCO2 huff and puffEnhanced recoveryNumerical stimulationCO2 sequestration
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