松南火山岩气藏底水脊进模型建立及应用

Establishment and Application of the Bottom Water Ridge Invasion Model of Songnan Volcanic Gas Reservoir

松南火山岩气藏位于松辽盆地南部长岭断陷达尔罕断凸带腰英台深层构造之上,气藏底水发育,2008年投入开发,以水平井为主^([1-2])。随着气藏持续开发,水侵伤害越来越突出,为延长气井无水采气期,降低水侵伤害,建立了松南火山岩气藏底水脊进模型,并按模型计算出的临界压差和产气量进行了控水应用,取得了明显的效果,表明气井在临界生产压差以下生产时可实现水脊高度回落,对松南火山岩气藏控水和高效开发有重要的指导意义。

Songnan volcanic gas reservoir is located above the deep formation of Yaoyingtai in Darhan fault zone of Changling fault depression in Southern Songliao Basin. The gas reservoir＇s bottom water is developed, this reservoir has been developed since 2008,main well type is horizontal well. With the development of this field, aquifer encroachment is becoming more and more prominent. In order to extend water-free gas production period and determine the damage of water invasion, the model of bottom water ridge invasion in Songnan volcanic gas reservoir was established, and the critical pressure difference and the gas production were calculated to control the water invasion based on the model, and obvious effect was obtained. The research suggests that the water ridge is able to fall under the critical pressure difference, which will make Songnan volcanic gas reservoir to be developed efficiently