流花11-1礁灰岩油藏水驱及注气吞吐渗流机理实验研究

发布时间：2018-05-21 03:21

本文选题：礁灰岩油藏 + 全直径岩心　；参考：《西南石油大学》2017年硕士论文

【摘要】：流花11-1油藏是流花11-1油田主要投入开发的底水控制的块状油藏,储层开发主要目标层系为上第三系中新统珠江组生物礁灰岩,以次生孔隙为主,微裂缝较发育,属于中-高孔渗储层孔隙类型。储层发育的裂缝在油藏开发过程中起着关键作用,能提高油井生产能力、改善开发效果,但却增强了油藏非均质性,从而引起底水窜流造成生产井水淹。由于礁灰岩储层地质条件复杂,油藏开发面临底水快速锥进、采出程度低等问题。为了改善油藏开发效果,论文以流花11-1礁灰岩礁灰岩油藏为研究对象,使用能更好地还原储层实际情况的全直径岩心,筛选出裂缝--孔隙发育的,进行岩样物性分析、油水相渗曲线测试以及纵向水驱实验、注气吞吐实验等研究,在充分认识油藏水驱渗流特征及产水规律的基础上,进行油藏水驱油及注气吞吐渗流机理研究,进而提出能有效改善油田开发效果的开发对策。论文得到以下结论和认识:(1)对取得的全直径岩心进行物性分析,结果显示礁灰岩孔隙结构复杂,微裂缝发育,所取岩样的孔隙度和渗透率跨度大。(2)以不同渗透率及裂缝发育为标准,对8组全直径岩心进行了相对渗透率曲线测定(其中3组为稳态法测定,5组为非稳态法),结合相应理论知识,对比相渗曲线特征,分析其渗流特征。(3)选取油藏不同层位的全直径岩心,进行纵向水驱油实验,获得了地层温度压力条件下的水驱渗流特征、产水规律以及焖井、提液的增油情况,结合岩心孔渗特性,分析水驱渗流机理和特征。(4)基于相似孔渗特性,利用组合全直径岩心开展注气吞吐实验,模拟高含水阶段顶部注气压锥,分析了氮气吞吐控水增油效果。通过以上研究,进一步认识了礁灰岩油藏水驱渗流特征,为油田以后制定相应的开发对策提供了依据。
[Abstract]:Liuhua 11-1 reservoir is a block reservoir controlled by bottom water in Liuhua 11-1 oilfield. The main target series of reservoir development is bioreef limestone of the Miocene Zhujiang formation in the Neogene, with mainly secondary pores and relatively developed microfractures. It belongs to the pore type of medium-high porosity and permeability reservoir. The fractures developed in the reservoir play a key role in the development of the reservoir, which can improve the production capacity of oil wells and improve the development effect, but it enhances the heterogeneity of the reservoir, thus causing the bottom water channeling and flooding of the production wells. Because of the complex geological conditions of reef limestone reservoir, reservoir development is faced with problems such as rapid coning of bottom water and low recovery degree. In order to improve the reservoir development effect, the paper takes Liuhua 11-1 reef limestone reservoir as the research object, uses the full-diameter core which can better reduce the actual situation of the reservoir, and screens out the fracture-pore development to analyze the physical properties of rock sample. The oil / water phase permeability curve test, longitudinal water drive experiment, gas injection stimulation experiment and so on are studied. On the basis of fully understanding the percolation characteristics of reservoir water drive and the rule of water production, the mechanism of reservoir water flooding and gas injection is studied. Furthermore, the development countermeasures which can effectively improve the oil field development effect are put forward. The results show that the pore structure of reef limestone is complex and micro-fracture is developed. The porosity and permeability span of the rock samples taken are large, and the different permeability and fracture development are taken as the standard. The relative permeability curves of eight groups of full-diameter cores were measured (among them, 3 groups were determined by steady-state method and 5 groups by unsteady state method). The characteristics of phase permeability curves were compared with corresponding theoretical knowledge. By analyzing the percolation characteristics, the whole diameter core of different layers of the reservoir is selected, and the longitudinal water flooding experiments are carried out. The characteristics of water flooding seepage, the water production law and the oil increment of braised well and liquid are obtained under the condition of formation temperature and pressure. According to the characteristics of pore and permeability in core, the mechanism and characteristics of water drive seepage are analyzed. Based on the similar pore and permeability characteristics, gas injection and puff experiments are carried out by combined full diameter core, the top pressure cone is simulated in high water cut stage, and the effect of nitrogen huff and puff control water increasing oil is analyzed. Through the above research, the characteristics of water drive seepage in reef limestone reservoir are further understood, which provides the basis for formulating corresponding development countermeasures in the future.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE312

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