Rational Allocation of Multilayer Gas Wells with Producing Water in Tight Gas Reservoirs

During the extraction process of LX high and low pressure reservoirs, gas backflow happens, resulting in the loss of capacity; meanwhile, low-pressure formations will be harmed. The method, which combines the experimental study and theoretical analysis, determines rational proration of research area and directs the efficient exploitation of tight gas reservoir with producing water. Establishing the productivity formula of multilayer reservoir with producing water determines the upper limitation of production allocation of water-producing gas well; moreover, according to the IPR curve, the lower limitation of rational proration of water-producing gas well has determined. Finally, the result indicates that the rational proration of the type I well in research area is 3.0–3.2 × 104 m3 and the rational proration of the type II well in research area is 1.6–2.0 × 104 m3. The case study results indicate that the production allocation of multilayer reservoir with producing water can effectively control the water production rate and Wellbore hydrops, reduce the effect of gas backflow, as well as maintain the smooth production of gas wells if the production allocation which was calculated by the new methods is within the reasonable capacity range.