Gas macrojamming is a natural phenomenon that consists in gas macrovolumes remaining outside the water displacement front. It can be observed in the process of formation waters inflow into the gas deposit. Gas macrovolumes jamming is due to heterogeneity of the producing reservoir and irregularity (in thickness and area) of the productive strata drainage by the available well network and operating productive intervals. Gas macrojamming processes are studied and controlled with the help of special geophysical and gas-dynamic methods of well surveying. These processes are predicted using special geological and mathematical models in the course of reservoir engineering and monitoring. Reducing the effects of gas macrojamming is one of the main issues of reservoir management.