Maintaining stable production is challenging in the Ma Hu oil reservoir due to its inherent properties, which drive low recovery forecasts and steep production declines. For boosting Ma Hu tight sandstone recovery, core experiments simulating Well A’s reservoir conditions initiate cyclic CO2 miscible flooding on tight gravel/sandstone samples. At reservoir pressure, 70 mol% CO2 dissolution is observed experimentally, elevating the coefficient to 2.28. Concurrently, the expansion coefficient reaches 1.83 (83% increase) and crude viscosity declines by 65%. After three cycles, tight sandstone achieves 40.56% total displacement efficiency with exponential decline per round. The first cycle dominates at 27.25% (67.2% of total), while tight gravel reaches 29.32% total efficiency, 81.51% from the first cycle. Tight sandstone mainly mobilizes crude oil in large (T2 > 10 ms) and medium (1 ms < T2 < 10 ms) pore throats; Crude oil achieves full mobilization in sparsely occupied large pore throats, with meso/micro-pore throats (T2 < 1 ms) also showing high mobilization extents. Implementation of CO2 huff-and-puff in three Block A horizontal wells yields 15,682 t cumulative oil, averaging 5227.3 t incremental production per well at 1:1.51 exchange ratio, demonstrating viability for tight sandstone recovery enhancement.