Induced Mechanisms and Control Strategies of Interwell Interference During Huff‐and‐Puff Operations in Tight Reservoir Dual Horizontal Wells

ABSTRACT Dual‐horizontal‐well huff‐and‐puff is an important technique for enhancing production in tight low‐permeability reservoirs. However, interwell interference often results in lower‐than‐expected recovery and rapid production decline. To address this issue, a low‐permeability reservoir in Block A of the Ordos Basin was selected as the study area. A multiphysics coupled numerical model integrating the seepage field, stress field, and hydraulic fracturing field was established to investigate the induced mechanisms of interwell interference. The analytic hierarchy process (AHP) was employed to calibrate the boundary parameters of the numerical simulation, improving the rationality of the parameter system. On the basis of the simulation results, the induced mechanisms and dynamic evolution characteristics of interwell interference during huff‐and‐puff operations were systematically clarified. Furthermore, key injection parameters were optimized using the control variable method, and the optimized scheme was applied in field practice to verify its reliability and engineering applicability. The results indicate that pressure wave propagation and fracture network reconfiguration induced by the stimulated well during huff‐and‐puff operations alter the seepage pathways of the offset well, which is identified as the fundamental cause of interwell interference. AHP analysis reveals that the oil production rate is the core indicator for defining the interference threshold. Through parameter regulation based on controlled variable analysis, the oil production decline rate of the offset well decreased by 19.4%, overall oil recovery efficiency increased by 2.2 times, and the degree of interwell interference was significantly mitigated. The findings provide theoretical and technical support for optimizing huff‐and‐puff development schemes for dual horizontal wells in low‐permeability reservoirs.