致密油藏不同开发方式原油动用规律实验研究  

Experimental Study of Effective Displacement Characteristics of Different Displacing Methods in Tight Oil Reservoir

作　　者：潘伟义[1,2] 郎东江[1,2] 伦增珉[1,2] 吕成远[1,2] 赵淑霞[1,2] 王海涛[1,2] 赵清民[1,2] PAN Wei-yi LANG Dong-jiang LUN Zeng-min LV Cheng-yuan ZHAO Shu-xia WANG Hai-tao ZHAO Qing-min(State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Beijing 100083, China Exploration ＆ Production Research Institute of SINOPEC, Beijing 100083, China)

机构地区：[1]页岩油气富集机理与有效开发国家重点实验室,北京100083 [2]中国石化石油勘探开发研究院,北京100083

出　　处：《CT理论与应用研究（中英文）》2016年第6期647-652,共6页Computerized Tomography Theory and Applications

基　　金：国家重大科技专项(2016ZX05048);国家自然科学基金项目(51504283)

摘　　要：致密油是重要的非常规石油资源,但由于其一次采收率低,需要开展提高采收率研究。由于致密油储层孔隙结构复杂,不同孔隙对产量的贡献差异很大,需要深入研究不同孔隙中原油的动用情况进而优化开发方式。本文采用核磁共振测试与驱替实验相结合的方法开展研究,直观反映不同注入条件下注入介质与原油的驱替过程,明确了注水和注CO2两种开发方式不同孔隙中原油的动用规律。结果表明:水驱和CO2驱不同孔隙区间原油动用程度随着驱替压差逐渐增大而增大;水驱和CO2驱大孔隙中的原油绝大部分被动用,随着孔隙半径逐渐减小,原油动用的比例逐渐降低;小于0.01μm微小孔隙中CO2驱动用效果明显好于水驱,致密油藏中CO2更易进入小孔隙提高致密油采收率。Tight oil is an important unconventional hydrocarbon resource. Its low recovery of primary production induces the necessities of enhanced oil recovery researches. Due to the complex pore structure of tight oil reservoir, the contribution of different pores is different. So it is necessary to study effective displacement in different pores and optimize development mode. In this study, nuclear magnetic resonance （NMR） and core flood tests were conducted to experimentally simulate different displacing methods （CO2 flooding and waterflooding）, and to evaluate effective displacement of different pores. The tests results indicated that effective displacement of different pores of CO2 flooding and waterflooding increases with an increasing pressure drawdown. Most of the oil in large pores was displaced. As the pore radius turned small, displaced oil gradually decreased. In the pores with radius less than 0.01 μm, effective displacement of CO2 flooding was better than that of waterflooding. In tight oil reservoir CO2 was easier to enter the small pores to enhance oil recovery.

关 键 词：致密油 核磁共振测试 水驱 CO2驱 动用规律 

分 类 号：TE34[石油与天然气工程—油气田开发工程]