LH11-1油田礁灰岩油藏水驱及提高采收率渗流机理实验研究

发布时间：2018-03-30 03:34

本文选题：礁灰岩　切入点：相渗曲线　出处：《西南石油大学》2017年硕士论文

【摘要】：LH11-1油田是位于珠江口盆地沉降中的东沙隆起地区的大型生物礁灰岩油藏。油藏主要采用水驱开发,但是由于储层地质条件复杂,目前位于开发区的生产井含水上升很快,总的油藏采出程度较低。为了进一步提高LH11-1油田的采出程度,需要对这种溶洞-孔隙型礁灰岩油藏的油水两相渗流特征做进一步的研究,为此本文针对LH礁灰岩油藏开展了一系列的油水两相驱室内实验研究。本文首先对从LH11-1油田取得的岩心进行了物性分析,然后进行了一系列短岩心和长岩心的油水驱替实验研究了礁灰岩的渗流机理,并在此基础上通过注入不同的流体研究了适合礁灰岩油藏的提高采收率方式。取得的认识如下:1对取得的岩心进行了物性分析,结果表明礁灰岩孔隙结构复杂,孔洞十分发育,局部存在微裂缝,岩心含有大量的敏感性矿物,岩性十分复杂。2选取了 5块短岩心进行了相渗分析,结合礁灰岩的物性特点分析了其形态特征。分析了渗透率级差实验中产生的特殊现象,为油藏以后的开发提供了依据。3选取了不同物性的岩心进行了长岩心实验,获得了其在高温高压条件下的油水相对渗透率曲线,通过结合相应的渗流知识分析了礁灰岩油藏油水的渗流特征。4在高倍水驱基础上分别注入了氮气泡沫、凝胶和聚合物三种不同的流体,分析了适合于礁灰岩油藏的提高采收率方式。通过以上的研究加深了对礁灰岩油藏水驱油渗流特征的认识,为油田以后开发策略的调整,采用合理的方式提高原油采收率提供了依据。
[Abstract]:LH11-1 oil field is a large reef limestone reservoir in Dongsha uplift area, which is located in the subsidence of Pearl River mouth basin. The reservoir is mainly developed by water flooding. However, due to the complex geological conditions of the reservoir, the water cut of the production well in the development zone is rising rapidly at present. In order to further improve the recovery degree of LH11-1 oilfield, it is necessary to further study the oil-water two-phase percolation characteristics of this kind of cavern-pore reef limestone reservoir. In this paper, a series of laboratory experiments of oil-water two-phase flooding are carried out for LH reef limestone reservoir. Firstly, the physical properties of the core obtained from LH11-1 oilfield are analyzed. Then a series of oil-water displacement experiments of short core and long core were carried out to study the seepage mechanism of reef limestone. On the basis of this, different fluids are injected into the reservoir to study the ways to improve the recovery factor of the reef limestone reservoir. The obtained understanding is as follows: 1. The physical properties of the obtained core are analyzed. The results show that the pore structure of the reef limestone is complex and the pore cavity is very developed. The core contains a large number of sensitive minerals, and the lithology is very complicated. 2. 5 short cores are selected for phase permeability analysis. Combined with the physical characteristics of reef limestone, the morphological characteristics of reef limestone are analyzed, and the special phenomena in permeability differential experiment are analyzed, which provides a basis for reservoir development. 3. The long core experiments are carried out by selecting cores with different physical properties. The relative permeability curves of oil and water under high temperature and high pressure are obtained. By combining the percolation knowledge, the characteristics of oil and water percolation in reef limestone reservoir are analyzed. 4. Nitrogen foam is injected separately on the basis of high power water drive. Three different kinds of fluids, gel and polymer, are analyzed in this paper, which are suitable for improving oil recovery in reef limestone reservoir. Through the above research, we have deepened the understanding of the characteristics of water drive oil percolation in reef limestone reservoir, so as to adjust the development strategy of oil field in the future. A reasonable way to improve oil recovery is provided.
【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】：TE357.6

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