武兴,王安成,巩联浩,刘继梓,陈江
WU Xing,WANG Ancheng,GONG Lianhao,LIU Jizi,CHEN Jiang

• 1:中国石油长庆油田分公司第六采油厂
• 2:中国石油长庆油田分公司勘探开发研究院

摘要(Abstract)：

致密储层注水开发过程中注水困难、能量补充不足、产量迅速下降,需要研究经济可行的补充地层能量的致密油藏开发方法。通过开展岩心在线核磁共振扫描驱替实验分析连续水驱和吞吐水驱不同孔径孔隙中原油动用及剩余油分布特征,研究吞吐水驱的最佳吞吐次数。研究表明:鄂尔多斯盆地A83区块长8储层样品初始状态下原油主要赋存在中、大孔隙(0.045～4.5μm)内,且中、大孔隙内的可动原油饱和度比例高;连续水驱和吞吐水驱2种注水方式下采出的原油大部分来自中、大孔隙;吞吐后水驱能提高中、大孔隙内的驱油效率和小孔隙的动用程度;注水吞吐最佳次数为2次,尽量延长闷井时间,并采用"吞吐—水驱"交替的方式开发来提高各类孔径孔隙的动用程度。研究成果为致密油藏高效注水开发提供了重要的依据。
In the process of waterflooding development of tight reservoirs, it is faced with the problems of water injection difficulty, insufficient energy supplement and rapid decline of production. It is necessary to study the economic and feasible development method of the reservoirs to complemont the formation energy. Through the core online NMR scanning displacement experiment, the characteristics of the developed crude oil and the remaining oil distribution in different pore sizes by the continuous water flooding and huff-puff water flooding are analyzed, the optimal huff and puff times are researched as well. The results show that the crude oil in the initial state of Chang-8 reservoir sample in Block A83 of Ordos Basin is mainly distributed in the medium and large pores(0.045～4.5 μm), and the proportion of the movable oil saturation in the medium and large pores are pretty high. Most of the crude oil produced by continuous water flooding and huff-puff water flooding comes from the medium and large pores; the water flooding after huff and puff can improve the oil displacement efficiency in the medium and large pores and the producing degree in small pores. The best times of water injection huff and puff is 2 times, and the soaking time is prolonged as far as possible.The alternate development mode between huff-puff and water flooding should be adopted to improve the producing degree in various pore sizes. The research results provides an important basis for the high-efficiency water-injection development of the tight reservoirs.

关键词(KeyWords)： 致密油藏;连续水驱;吞吐水驱;核磁共振(NMR);岩心在线核磁共振扫描驱替实验;孔隙
tight oil reservoir;continuous water flooding;huff-puff water flooding;nuclear magnetic resonance(NMR);core online NMR scanning displacement experiment;pore

Abstract:

Keywords:

基金项目(Foundation): 国家科技重大专项“鄂尔多斯盆地大型低渗透岩性地层油气藏开发示范工程”(2016ZX05050)

作者(Author): 武兴,王安成,巩联浩,刘继梓,陈江
WU Xing,WANG Ancheng,GONG Lianhao,LIU Jizi,CHEN Jiang

DOI: 10.19597/j.issn.1000-3754.202005018

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