Physical simulation for water invasion and water control optimization in water drive gas reservoirs

Abstract The development of water drive gas reservoirs (WDGRs) with fractures or strong heterogeneity is severely influenced by invasion. Accurately simulating the rules invasion and drainage recovery countermeasures in fractured WDGRs, thereby revealing mechanism an appropriate strategy, important for formulating management measures enhancing reservoirs. In this work, physical simulation methods were proposed to gain a better understanding optimize control WDGRs. Five groups experiments designed conducted probe impacts distance between well, position, timing aquifer size on production performance reservoir. internal pressure drop monitored real time during experiments. Based above experimental works, theoretical analysis was quantitatively evaluate reservoir via well performance, invasion, dynamic residual distribution analysis. results show that when fracture scale appropriate, drilled close (Experiment 1-3) high-permeability formation could also produce achieve efficiently. factor Experiment 1-3 reached 62.5%, which 24.6% 21.1% higher than those Experiments 1-1 1-2, respectively, had wells low-permeability areas. Draining near can effectively inhibit early stage recovery. setup 2-1 inhibited avoided water-sealed volumes recover 30% more recovered without wells. A shorter increased capacity decreased capacity, respectively (Well 2 at Point vs B). larger lower recovery, reduced economic benefit. For example, due infinitely large aquifer, reserves 4-1 developed single only 33.4%. These research are expected be beneficial preparation plans optimization