Study On Mechanism Of Producing Water Of Gas Pool In Xiangxi Group,Central Part Of Sichuan Basin

According to the comprehensive research of explore and develop it was indicated that Xiangxi Group in Sichuan central part is buried shallow, drilling degree lower, which is the best layer that have exploiting potentiality at present. Under the background of the characteristic of low porosity and low permeability in Xiangxi Group, reservoir mainly is the layer and fracture zone that have higher porosity and permeability. The output and distributing of gas and water is very complexity because of the characteristic of Xiangxi Group reservoir. It is general that gas pool produce water in the course of developing, some even go into operation with producing on the angry water. This has influenced seriously the recovery ratio of gas pool, and brought greater degree of difficulty to management of developing and choice of developing the measure.On the basis of the combine of gas pool geology and development, it was analysed that includes driving energy and mode of pool, mechanism of producing water, distributing of gas and water etc. And in the paper it was brought forward a distributing mode of gas and water, which can predict the developing potentiality of gas well. And obtain some important conclusions.1. According to the research of geology it was indicated that reservoir mainly is the layer and fracture zone that have higher porosity and permeability under the background of the characteristic of low porosity and low permeability in Xiangxi Group, and have high heterogeneity.2. According to the analysis of develop geology the space of reservoir is the absolute and closed system. Gas driving is the primary driving type in gas pool which exist water. The driving energy comes from the flexibility of gas which includes all gas in a connecting system.3. Based on the geology and development of ten wells, it is established the distributing mode of gas and water, which can explain the characteristic of develop perfectly.4. In the paper it is brought forward that the equation of material balance is fit to the characteristic in central part of Sichuan, and estimate the reserve for the well which have the condition.5. Based on the comprehensive research of distributing and output of gas and water, formational pressure etc, it was pointed out the well that have good potentiality to develop must have taken measures for drainage.