%0 Journal Article %A Zhang, Min %A Yu , Chunlei %A Yang , Yong %A Sun , Yeheng %A Zhang , Yigen %A Sun , Baoquan %A Yang , Weiyu %D 2018 %I Begell House %K single straight capillary, gas wettability, fluorocarbon polymer, sessile drop method, quasistatic %N 1 %P 21-26 %R 10.1615/SpecialTopicsRevPorousMedia.2018022574 %T STUDY ON GAS WETTABILITY BASED ON SINGLE STRAIGHT CAPILLARY %U https://www.dl.begellhouse.com/journals/3d21681c18f5b5e7,40d7a718708172f9,2a4efeff67223420.html %V 9 %X Gas wetness plays an important role in enhancing the recovery in gas reservoirs, especially in low-permeability ones. In the study, the sessile drop method is used to measure quantitatively gas wettability of the slide. After treating by various concentration of fluorocarbon polymer (Zonyl8740) solutions, the inside walls of capillary present different levels of gas wetness. Quasi-static water-driving gas experiments were conducted in gas/water system in the capillaries. The effect of gas wetness on the front of water-displacing gas was investigated. The results showed that gas wettability of capillary inside walls gets strong with the increase of fluorocarbon polymer solution concentration, gas/water interfaces of the water driving gas front shows different shapes under different gas-wetness conditions, and capillary force is resistance of water-displacing gas in the case of preferential gas wettability, while it is the power in the case of non-gas wettability. The study provides theoretical support for raising the water displacement recovery in gas reservoirs by gas wettability reversal improving gas/water seepage situation. %8 2018-03-12