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根据美国、苏联等国大量的处于开发后期和正在开发的有水气藏,其开采方式大体有以下四种: 1.利用水驱气和天然气自身膨胀能量的常规开采方式。由于储层的非均质性和开采的不平衡过程,使气水界面不能均匀推进,形成“封闭气”或“封闭气块”。这是水驱气藏采收率(40～80％)比气驱气藏采收率(75～95％)低的主要原因。这种开采方式表面上看来,利用自然能量,既节省矿场投资又节省人力,但实际上拖延了开发时间,采收率又低,最不经济。 2.强化排水、加速采气。这种开采方式一般在气藏水侵、部分气井出水后采用,对释放封闭气起到明显的作用,比常规的开采方式获得的采收率高10～20％。如美周的阿拉赞气顶气藏,用常规开采
According to a large number of water-gas reservoirs in the late stages of development and under development in the United States, the Soviet Union and other countries, there are generally four types of mining methods: 1. Conventional mining methods using water-purging and self-expanding natural gas. Due to the heterogeneity of the reservoir and the unbalanced mining process, the gas-water interface can not be uniformly propelled to form a “closed gas” or “closed gas block.” This is the main reason that the recovery ratio of water-driven gas reservoirs (40-80%) is lower than that of gas-driven gas reservoirs (75-95%). On the surface, this kind of mining method uses natural energy to save the investment of the mine and save manpower. However, in fact, the development time is delayed, the recovery rate is low and the least economical. 2. Strengthen the drainage, accelerate gas recovery. This mining method is generally used in the reservoir water invasion, some gas wells after the water, the release of closed gas played a significant role, than the conventional mining methods to obtain high recovery rate of 10 to 20%. Such as the United States Week of Alazhan gas capitals, with conventional mining