Experimental study on production performance and reserves utilization law in carbonate gas reservoirs

Abstract Carbonate gas reservoirs in China are rich reserves. In the development process, there many reserves with low permeability, efficiency and recovery degree. It is difficult to stabilize well production prolong its life cycle. Under condition of original water saturation ( Sw ) 0%, 20%, 40%, 55% 65%, respectively, physical simulation experiment depletion was carried out by using long core multi-point embedded pressure measuring system. The cores average permeability 2.300 mD, 0.485 mD 0.046 (assembled from 10 carbonate cores) were used carry this experiment. During experiment, dynamics at different positions inside outlet recorded real time reveal performance utilization law reservoirs. results show that stable period tight reservoir short, relatively long. rate increase decrease saturation. less than 0.1 greatly affected pore water, distribution shows a steep drop funnel, far rarely used. Therefore, should be utilized closing restore formation balance, densifying pattern or transforming reservoir. variation range influenced saturation, closely related gradient process. decreases increases research provide theoretical basis for understanding relationship between properties performance, law, realizing balanced utilization, efficient long-term