FQ孔隙型碳酸盐岩油藏注水及注气优选大模型实验研究

发布时间：2018-06-27 19:10

  本文选题：碳酸盐岩油藏 + 注水　； 参考：《西南石油大学》2016年硕士论文

【摘要】：FQ油藏是一个以白垩纪和第三系碳酸盐岩油藏为主的多层系大型油藏,该油藏地质储量大,储层以孔隙为主,局部发育少量裂缝,原油黏度小,地层水矿化度高,地层弹性能量充足。油藏目前以衰竭式开采为主,开采过程中,层间及层内采液能力差异大,部分井含水上升快,老井产量递减快,油藏稳产难度大本文根据该油藏的基本地质特征,利用相似原理,推导了孔隙型碳酸盐岩油藏气驱的相似准则,实现了三维物理模型参数与油田实际参数的相互转换,在国内首次设计并制作了碳酸盐岩油藏三维物理模型。模型Ⅰ相似于FQ油藏的Mishrif层,纵向上模拟正韵律沉积,平面上部署了两口水平与三口直井,利用该模型开展了四组水驱实验及三组气驱实验。模型Ⅱ相似于FQ油藏的Asmari层,纵向上白云岩与砂岩相间出现,平面上部署了五口直井,利用该模型开展了三组水驱实验及三组气驱实验。模型Ⅰ的七组实验分别研究了：原油是否老化对三维物理模型实验结果的影响；不同注水方式对油藏最终采出程度的影响；先注气后注水的开发方式对油藏最终采出程度的影响；注天然气与注氮气驱油效率的高低；顶部注气与底部注气两种注气方式驱油效率的高低。模型Ⅱ六组实验分别研究了：先衰竭式开采后注水开采与不衰竭式开采而直接注水开采的两种开发方式对薄互层油藏最终采出程度的影响；水驱后期提高采液速度的稳产效果；注天然气、注氮气以及CO2多井协同吞吐+CO2驱三种注气方式驱油效率的高低；注水中期转注气提高油藏采收率的效果。通过三维物理模拟实验研究,结合油藏工程方法,进行了水驱特征曲线研究、油水相渗实验研究以及采出程度与含水率变化规律研究,研究结果表明：衰竭式开采可以延长无水采油期,提高碳酸盐岩油藏采收率；水平井与直井联合开采可以提高扫油效率,从而提高油藏采收率；注气后注水可以扩大注入介质的波及体积；注水后注气可以有效降低油藏含水率,减慢含水上升速度；三种气体中,注CO2驱油效率最高,但是CO2易腐蚀管线,氮气无腐蚀性。通过三维物理模拟实验,结合注入油与采出油黏度测定、色谱分析,得到这类油藏注气提高采收率的主要机理为：扩大波及体积、控水增油、降低原油黏度、疏通油流通道、降低界面张力、萃取轻烃组分。本文研究得出孔隙型碳酸盐岩油藏采用衰竭式开采+注水开采+气水交替开采的开发效果较为理想,可用于油藏实际。
[Abstract]:The FQ reservoir is a large multilayer reservoir mainly composed of Cretaceous and Tertiary carbonate rocks. The reservoir has large geological reserves, mainly porosity, a small number of fractures, low viscosity of crude oil and high salinity of formation water. The elastic energy of the formation is sufficient. At present, the reservoir is dominated by depleted production. In the process of production, there are great differences in the recovery capacity between layers and in layers, the water cut of some wells rises rapidly, the production of old wells decreases rapidly, and the stable production of the reservoir is difficult to stabilize according to the basic geological characteristics of the reservoir. By using the similarity principle, the similarity criterion of gas drive in porous carbonate reservoir is deduced, and the three dimensional physical model parameters are converted to the actual oil field parameters for the first time in China. The three-dimensional physical model of carbonate reservoir is designed and made for the first time in China. Model I is similar to the Mishrif layer in FQ reservoir and simulates the positive rhythm deposition longitudinally. Two horizontal and three straight wells are deployed on the plane. Four groups of water drive experiments and three sets of gas drive experiments are carried out using the model. Model 鈪，

本文编号：2074987