Abstract
A gas storage is usually an artificial gas field or gas reservoir formed by re-injecting natural gas which is from the long-distance pipeline into the underground space. A gas storage is generally built in the vicinity of a city. A certain gas storage of this paper which is situated in North China is an important basis and guarantee for relieving tension of using natural gas for citizens and industries of cities in winter in North China. In this paper, the effectiveness of the gas storage is evaluated by studying the geological conditions of the gas storage, the period of fault activity, the relative relationship between the two faults, the sealing coefficient of the fault and the closure of the cap. Combined with the two conditions on the demand and the transportation of natural gas, the gas injection time and production time are determined together with injection and production balance time of the gas storage. After that, four different gas storage operation schemes are achieved whose peak regulation intensity is 1.2:1, 1.4:1, 1.6:1, and 1.8:1 respectively. Through the software simulation calculation comprehensively, many indicators are obtained such as the design operation gas volume time, liquid production volume, the number of required wells, the average gas production volume in the stage of gas production peak and so on. Also, the optimal operation plan of the gas storage is established. The above research results show that the gas storage has good sealing properties and is a good choice for building the gas storage. The optimized operation scheme can ensure the stable and orderly operation of the gas storage and meet the design requirements of peaking regulation. The construction of the gas storage is of great significance for maintaining national energy security and improving the imbalance between natural gas supply and consumption.
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