Characterizing CO2 residual trapping in-situ by means of single-well push-pull experiments at Heletz, Israel, pilot injection site – experimental procedures and results of the experiments

摘要: Abstract Two dedicated field experiments have been carried out at the Heletz, Israel pilot CO2 injection site. The objective has to quantify residual trapping in-situ, based on two distinctly different methods. Both are principle of a combination hydraulic, thermal and/or tracer tests before and after creating residually trapped zone using difference in responses these estimate in-situ trapping. In Residual Trapping Experiment I (RTE I), autumn 2016, main characterization test creation were hydraulic withdrawal tests. this experiment, was also created by fluid withdrawal, first injecting CO2, then withdrawing fluids until saturation. second II II), 2017. injection, followed CO2-saturated water, push away mobile leave behind. test, reference recovery gas partitioning Krypton. This paper presents experimental procedures results experiments. A as method robust gave clear signal. Given difficulties water optimally saturated with order not dissolve or create situations excess gas, may be generally preferable testing method, comparison injection. limitation any is that it only gives an averaged value over section. At Heletz additional information about distribution obtained measurements monitoring pressure between sensors bolehole. latter could used amount well Tracer tracers can give more detailed reservoir than can, but far complicated carry out, involving sophisticated sensitive equipment. case optimal turned difficult achieve. Creating saturation means rather seemed approach. Monitoring contents interval good guidance state system. Model interpretations obtain values for presented companion papers same Special Edition.