西湖凹陷低渗储层水的赋存状态及出水特征研究

Water occurrence state and water breakthrough characteristics in low permeability reservoirs of Xihu sag

西湖凹陷低渗储层开发井在投产初期均不同程度产水,产水量长时间保持稳定。针对其出水原因及出水特征,通过可动水实验判别法和"双水"曲线评价法,分析了西湖凹陷低渗储层中地层水的两种赋存状态;通过产水判别图版法和低渗气藏数值模拟研究,结合实际生产动态分析,综合研究认为,西湖凹陷低渗储层的出水特征为投产即见水,且短时间内不会造成水的突然舌进及暴性水淹。

At the beginning of production of development wells in low permeability reservoirs of Xihu sag,there was different degree of water production and the water production remained stable for a long time.Aiming at the reason of water breakthrough and its characteristics,through movable water experiment and'dual water'curve evaluation method,two kinds of water occurrence state in low permeability reservoirs of Xihu sag were analyzed.Through discriminant engraving method of water production and numerical simulation of gas reservoir,combined with comprehensive analysis,one of the characteristics was water breakthrough at the beginning of production,and there was no fingering and serious waterflooding in short period.