松南气田火山岩气藏产水特征和控水策略

摘要

基于天然气单次闪蒸实验、气藏水化验分析两种方法，区分松辽盆地松南气田气井产水类型；结合气藏精细描述，分析不同气井的产水机理；进一步利用数值模拟，探索火山岩气藏控水策略。松南气田产水可分为凝析水和地层水两种类型，构造高部位火山机构气井产凝析水，构造低部位火山机构气井产地层水。断层引起的底水上窜是造成构造高部位钻井产少量地层水的主要原因。通过数值模拟发现，采气速度越高，边底水锥进越快。松南气田火山岩气藏最优采气速度约在3．6％。根据高部位高配、低部位低配的控水原则，明确了不同类型、不同构造部位火山岩气井合理产量，可有效控制火山岩气井出水，实现气藏稳产。%Based on the gas single flash experiment and gas reservoir water chemical examination,the types of water production of Songnan gas field in Songliao Basin were determined.Combined with fine description of volcan-ic reservoirs,the different water production mechanisms were analyzed.Furthermore,the authors explored the wa-ter control strategy based on numerical simulation.The water production in Songnan gas filed can be divided into two types:condensate water and formation water.The gas wells which drilled the high volcanic edifice produce condensate water,while drilled the low volcanic edifice produce formation water.The bottom water coning along the fault is the primary cause of formation water output from some gas wells drilled the high volcanic edifice.The nu-merical simulation indicated that there is a positive correlation between gas recovery rate and bottom water coning rate.The optimal gas recovery rate in Songnan volcanic gas field is about 3. 6%.According to the water control principle of high production at high structural position and low production at low structural position,the authors cal-culate the reasonable production of volcanic gas wells with different types and locations to meet the needs for a long-term stable production in volcanic gas reservoirs.