莺歌海盆地高温高压气藏水溶气释放对气水界面的影响

发布时间：2018-05-16 16:39

  本文选题：高温高压 + 天然气藏　； 参考：《地球科学》2017年08期

【摘要】：莺歌海盆地X区属于高温高压气藏,水溶气含量大,水溶气释放对气水界面及水侵规律的影响不明.通过PVT物性分析仪,采用复配的天然气和地层水测试了X区不同区块水溶气溶解度变化规律.设计可视化填砂管实验,探索了水溶气释放对气水界面的影响规律.研究表明:水溶气溶解度受温度、压力、地层水矿化度和天然气组分的影响,随压力的增大逐渐增大,随温度的增大先减小后增大,拐点温度为80~90℃,地层温压条件下(145℃,54MPa)X-1区块水溶气含量为22.5m~3/m~3,X-2区块为8.7m~3/m~3.可视化填砂管实验研究表明:衰竭开采过程中,水溶气不断释放且携带地层水运移,同时在地层水自身泄压及毛管力作用下,气水界面明显上升.在此基础上,数值模拟气藏衰竭开采表明:水溶气溶解度越大气水界面上升越快,气井见水越早.预测期10a中,考虑水溶气时,X-1区要早800d见水,平面上推进快800m,纵向上推进快7.3m;X-2要早300d见水,平面上推进快近500m,纵向上推进快7.0m.
[Abstract]:The X area of Yinggehai Basin belongs to high temperature and high pressure gas reservoir, the content of water dissolved gas is large, and the influence of water soluble gas release on gas-water interface and water invasion law is unknown. By means of PVT physical property analyzer, the solubility of water soluble gas in different blocks of X area was tested by using compound natural gas and formation water. The experiment of visualized sand filling pipe was designed to explore the effect of water solution gas release on gas-water interface. The results show that the solubility of water soluble gas is affected by temperature, pressure, salinity of formation water and natural gas component, which increases with the increase of pressure, decreases first and then increases with the increase of temperature, and the inflection point temperature is 80 ~ 90 鈩，

本文编号：1897617