Abstract: In view of the unclear and inadequate basis for the preparation of gas injection scheme for gas field storage facility, based on the well test results of downhole coiled tubing of Xiangguosi gas storage facility, the concept of "temperature drop effect" and "variable skin effect" in gas injection period of the gas storage facility was proposed, and the influence of temperature drop effect, variable skin effect and reservoir stress sensitivity on injection and production in the injection and production of gas storage facility was analyzed. With the technology of analyzing the well test in injection period of gas field storage facility, the response characteristics of various factors on the well test curve and the influence on the well test interpretation parameters were studied. The results show that: ①Compared with the well test during the gas production period, the reservoir physical parameters obtained during the gas injection period have the same reference value; ②the temperature drop effect of gas storage facility has a negligible influence on the well test interpretation results, while the influence of variable skin effect and stress sensitivity effect varies greatly in different injection, production and operation periods; ③the influence of variable skin effect and stress sensitivity should be fully considered when preparing the injection, production and operation scheme of the gas storage facility, and well test should be conducted in different injection, production and operation periods to obtain accurate reservoir parameter values. The study results provide important study basis and theoretical guidance for the well test and interpretation of gas storage facility.

Key words: gas storage facility, well test analysis, temperature drop effect, skin coefficient, stress sensitivity, seepage characteristics, Xiangguosi gas storage facility