X8井气水产出关系分析

Analysis of gas-water production relationship for Well X8

四川盆地XN气田香溪群气井开采过程中见水普遍,气井见水后产能迅速降低或水淹停喷;气藏水体活跃,气井产气量低、产水量高,气藏开发效率低、采出程度不高。在分析气藏开发地质特征基础上,重点解剖了X8井开发过程中气水产出量的变化。与一般的有水气井不同,X8井见水后,初期每次开井先产水再气水同产,后期每次开井则先产气再气水同产。通过对水体特征和驱动能量的研究认为气藏水体体积有限,水体主要靠分隔气弹性驱动能量作用产出。分析了隔气式气藏的气驱机理,很好地解释了X8井气水产出的复杂现象。

Water-production is a normal phenomenon during gas production of Xiangxiqun gas well in XN gas field of Sichuan basin.Once a well encounters water,it stops to work or its production competence falls rapidly.And gas reservoir is characterized by low gas output,high water output,low exploitation efficiency and low recovery.On the basis of analyzing gas reservoir geologic property,we analyze the change of gas-water output in whole process especially.Being different from the normal gas well,X8 well products gas in advance after water production at initial stage and produces gas and water in every reproduction time at last,in contrast,it's early gas and later gas and water at later stage.Through studying aquifer property and drive energy,it's proposed that gas reservoir aquifer is finite and the water production is mainly by the function of elastic expansion energy of compartment gas.At last,we analyze gas-drive principles of compartment gas reservoir.By using it,we explain the complex phenomenon of gas-water production about Well X8 perfectly.