【摘要】 为延长火山岩气藏的开采寿命,提高气藏采收率,以松南气田主力火山机构S1为例,基于地质资料和气井生产动态资料,计算气井产出水的矿化度和水气比,分析地层压力特征、气井水侵模式及气井产水影响因素。结果表明,松南火山岩气藏驱动类型为弱水侵,水侵程度有加深趋势,见地层水井数不断增多,但地层压力尚未因水侵而出现明显的压降漏斗。该区的水侵模式为底水纵向锥进型、底水沿高渗带窜入型、底水沿高角度裂缝窜入型三类。影响气井水侵的因素为生产压差、避水高度、气井措施作业方式和钻遇地层特征。该研究为火山岩气藏的稳产控水与排水采气提供了借鉴。更多还原

【Abstract】 This paper presents a new study designed to prolong the exploiting life of volcanic gas reservoirs and enhance the recovery of gas reservoirs. The study is focused on to calculating the salinity and water-gas ratio of produced water in gas wells and analyzing formation pressure characteristics, water invasion model of gas wells and influencing factors of water production in gas wells using the major volcanic institutions S1 in Songnan gas field as an example and drawing on geological datas and production performance datas of gas wells. The results show that Songnan volcanic gas reservoir is the driving type of weak water invasion tending to deepen, in which the number of formation water wells is increasing, but without an obvious pressure drop funnel in the formation pressure due to water invasion. The area is characterized by the three types of water intrusion patterns: bottom water longitudinal taper, bottom water along the high permeability zone, and bottom water along high angle crack intrusion. The factors affecting gas well water intrusion are production pressure difference, water avoidance height, gas wells’ operation mode and characteristics of drilling formation. The research could serve as a reference for stable production, water control and drainage gas production in volcanic gas reservoirs.更多还原