低渗碳酸盐岩气藏产水动态规律及开发对策研究--以磨溪气田雷-1气藏为例

识别低渗碳酸盐岩边底水气藏产水动态规律,为该类气藏有效控水防水提供依据,以四川盆地川中地区磨溪气田雷一¹气藏为例,开展低渗碳酸盐岩气藏产水动态规律研究。结果表明:气藏产水主要由孔隙可动水、局部封存水和边水构成,其中局部封存水对气藏影响较小。气井生产普遍受到孔隙可动水的影响,几乎没有无水采气期,生产中水气比逐渐增大。气藏中区、东区边翼部位气井受到边水侵入影响。气藏边水沿层均匀侵入,气井距气水界面距离不同,水侵特征也不同。气井距气水界面越近,气井水侵特征出现的越早,水侵越活跃。根据不同产水类型的气井,针对性的提出了控水开发对策。

Study on water production dynamic law and development strategy of low permeability carbonate gas reservoir:A case study of Lei11gas reservoir in Moxi gas field

To recognize the water production dynamic law and provide the basis for effective water control and prevention of low permeability carbonate gas reservoir with edge and bottom water.Taking Lei11 gas reservoir in Moxi Gas Field in Central Sichuan Basin as an example,study on water production dynamic law and development strategy of low permeability carbonate gas reservoir.The results show that the water production of gas reservoir is mainly composed of pore movable water,local storage water and edge water,among which local storage water has little influence on gas reservoir.The production of gas wells is generally affected by the movable water in the pores.There is almost no water free gas production period,and the water gas ratio increases gradually in production.The gas wells in the middle and east of the gas reservoir are affected by edge water intrusion.The edge water of gas reservoir intrudes evenly along the formation,and the water invasion characteristics are different with the distance between gas well and gas water interface.The closer the gas well is to the gas water interface,the earlier the water invasion characteristics appear,and the more active the water invasion is.According to the gas wells with different water production types,the water control development countermeasures are put forward.